CA2370828C - Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor - Google Patents
Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor Download PDFInfo
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- CA2370828C CA2370828C CA002370828A CA2370828A CA2370828C CA 2370828 C CA2370828 C CA 2370828C CA 002370828 A CA002370828 A CA 002370828A CA 2370828 A CA2370828 A CA 2370828A CA 2370828 C CA2370828 C CA 2370828C
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
- A47K10/36—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means with mechanical dispensing, roll switching or cutting devices
- A47K10/3687—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means with mechanical dispensing, roll switching or cutting devices with one or more reserve rolls
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
- A47K10/36—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means with mechanical dispensing, roll switching or cutting devices
- A47K10/3631—The cutting devices being driven manually
- A47K10/3643—The cutting devices being driven manually by pulling the paper
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
- A47K10/38—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means the web being rolled up with or without tearing edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H19/00—Changing the web roll
- B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
- B65H19/12—Lifting, transporting, or inserting the web roll; Removing empty core
- B65H19/126—Lifting, transporting, or inserting the web roll; Removing empty core with both-ends supporting arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H20/00—Advancing webs
- B65H20/005—Electrical drive motor control devices therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K17/955—Proximity switches using a capacitive detector
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/02—Carrying-off electrostatic charges by means of earthing connections
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K2010/3233—Details of the housing, e.g. hinges, connection to the wall
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K2010/3253—Dispensers for paper towels or toilet-paper with one or more reserve rolls
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K2010/326—Dispensers for paper towels or toilet-paper dispensing simultaneously from several rolls or stacks
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
- A47K10/36—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means with mechanical dispensing, roll switching or cutting devices
- A47K2010/3668—Detection of the presence of a user
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S242/00—Winding, tensioning, or guiding
- Y10S242/906—Static charger or discharger
Abstract
Apparatus for dispensing paper from rolls which feeds continuously, roll to roll, and does not require extra procedure to bring stub roll into position. The apparatus has means for holding and positioning at least first and second rolls of paper with respect to each other; means for dispensing paper from the first roll; means for dispensing paper from the first and second rolls simultaneously when the first roll reduces to a predetermined diameter of paper, means for positioning the depleted first roll for replacement without the necessity of removing the second roll; and means for dispensing from the second and replacement rolls simultaneously when the second roll reduces to a predetermined diameter of paper. The apparatus also has a proximity sensor, which senses when a hand is placed near the dispenser, and thereupon dispenses a set amount of towel. The proximity sensor incorporates "static" and noise immunity circuitry.
Description
I
.f `
MINIMIZING PAPER WASTE CAROUSEL-STYLE
DISPENSER APPARATUS, SENSOR, METHOD AND
SYSTEM WITH PROXIMITY SENSOR
FIELD OF THE INVENTION
This invention relates to the field of paper roll dispensers. In particular it relates to a carousel dispensing system for paper towels adapted to dispense paper from a plurality of rolls. This invention relates to the field of proximity sensors. In particular it relates to the field of phase-balance proximity sensors. It relates to spurious noise-immune proximity sensors.
BACKGROUND
As is readily apparent, a long-standing problem is to keep paper towel available in a dispenser and at the same time use up each roll as completely as possible to avoid paper waste. As part of this system, one ought to keep in mind the person who refills the towel dispenser. An optimal solution would make it as easy as possible and as "fool-proof" as possible to operate the towel refill system and have it operate in such a manner as the least amount of waste of paper towel occurs.
This waste may take the form of "stub" rolls of paper towel not being used up.
Transfer devices are used on some roll towel dispensers as a means of reducing waste and decreasing operating costs. These transfer devices work in a variety of ways. The more efficient of these devices automatically begin feeding from a reserve roll once the initial roll is exhausted. These devices eliminate the waste caused by a maintenance person when replacing small rolls with fresh rolls in an effort to prevent the dispenser from running out of paper. These transfer devices, however, tend to be difficult to load and/or to operate. Consequently, these transfer devices are less frequently used, even though they are present.
The current transfer bar mechanisms tend to require the maintenance person to reinove any unwanted core tube(s), remove the initial partial roll from the reserve position, and position the initial partial roll into the now vacant stub roll position. This procedure is relatively long and difficult, partly because the stub roll positions in these current paper towel dispensers tend to be cramped and difficult to get to.
In order to keep a roll available in the dispenser, it is necessary to provide for a refill before the roll is used up. This factor generally requires that a "refill" be done before the current paper towel roll is used up. If the person refilling the dispenser comes too late, the paper towel roll will be used up. If the refill occurs too soon, the amount of paper towel in the almost used-up roll, the "stub"
roll, will be wasted unless there is a method and a mechanism for using up the stub roll even though the dispenser has been refilled. Another issue exists, as to the ease in which the new refill roll is added to the paper towel dispenser. The goal is to bring "on-stream" the new refill roll as the last of the stub roll towel is being used up. If it is a task easily done by the person replenishing the dispensers, then a higher probability exists that the stub roll paper towel will actually be used up and also that a refill roll be placed into service before the stub roll has entirely been used up. It would be extremely desirable to have a paper towel dispenser which tended to minimize paper wastage by operating in a nearly "fool proof' manner with respect to refilling and using up the stub roll.
As an enhancement and further development of .a system for delivering paper towel to the end user in as cost effective manner and in a user-friendly manner as possible, an automatic means for dispensing the paper towel is desirable, making it unnecessary for a user to physically touch a knob or a lever.
It llas long been known that the insertion of an object with a dielectric constant into a volume with an electrostatic field will tend to modify the properties which the electrostatic field sees. For example, sometimes it is noticed that placing one hand near some radios will change the tuning of that radio. In these cases, the property of the hand, a dielectric constant close to that of water, is enough to alter the net capacitance of a tuned circuit within the radio, where that circuit affects the tuning of the RF signal being demodulated by that radio. In 1973 Riechmann (U.S. Patent No. 3,743,865) described a circuit which used two antenna structures to detect an intrusion in the effective space of the antennae.
Frequency and
.f `
MINIMIZING PAPER WASTE CAROUSEL-STYLE
DISPENSER APPARATUS, SENSOR, METHOD AND
SYSTEM WITH PROXIMITY SENSOR
FIELD OF THE INVENTION
This invention relates to the field of paper roll dispensers. In particular it relates to a carousel dispensing system for paper towels adapted to dispense paper from a plurality of rolls. This invention relates to the field of proximity sensors. In particular it relates to the field of phase-balance proximity sensors. It relates to spurious noise-immune proximity sensors.
BACKGROUND
As is readily apparent, a long-standing problem is to keep paper towel available in a dispenser and at the same time use up each roll as completely as possible to avoid paper waste. As part of this system, one ought to keep in mind the person who refills the towel dispenser. An optimal solution would make it as easy as possible and as "fool-proof" as possible to operate the towel refill system and have it operate in such a manner as the least amount of waste of paper towel occurs.
This waste may take the form of "stub" rolls of paper towel not being used up.
Transfer devices are used on some roll towel dispensers as a means of reducing waste and decreasing operating costs. These transfer devices work in a variety of ways. The more efficient of these devices automatically begin feeding from a reserve roll once the initial roll is exhausted. These devices eliminate the waste caused by a maintenance person when replacing small rolls with fresh rolls in an effort to prevent the dispenser from running out of paper. These transfer devices, however, tend to be difficult to load and/or to operate. Consequently, these transfer devices are less frequently used, even though they are present.
The current transfer bar mechanisms tend to require the maintenance person to reinove any unwanted core tube(s), remove the initial partial roll from the reserve position, and position the initial partial roll into the now vacant stub roll position. This procedure is relatively long and difficult, partly because the stub roll positions in these current paper towel dispensers tend to be cramped and difficult to get to.
In order to keep a roll available in the dispenser, it is necessary to provide for a refill before the roll is used up. This factor generally requires that a "refill" be done before the current paper towel roll is used up. If the person refilling the dispenser comes too late, the paper towel roll will be used up. If the refill occurs too soon, the amount of paper towel in the almost used-up roll, the "stub"
roll, will be wasted unless there is a method and a mechanism for using up the stub roll even though the dispenser has been refilled. Another issue exists, as to the ease in which the new refill roll is added to the paper towel dispenser. The goal is to bring "on-stream" the new refill roll as the last of the stub roll towel is being used up. If it is a task easily done by the person replenishing the dispensers, then a higher probability exists that the stub roll paper towel will actually be used up and also that a refill roll be placed into service before the stub roll has entirely been used up. It would be extremely desirable to have a paper towel dispenser which tended to minimize paper wastage by operating in a nearly "fool proof' manner with respect to refilling and using up the stub roll.
As an enhancement and further development of .a system for delivering paper towel to the end user in as cost effective manner and in a user-friendly manner as possible, an automatic means for dispensing the paper towel is desirable, making it unnecessary for a user to physically touch a knob or a lever.
It llas long been known that the insertion of an object with a dielectric constant into a volume with an electrostatic field will tend to modify the properties which the electrostatic field sees. For example, sometimes it is noticed that placing one hand near some radios will change the tuning of that radio. In these cases, the property of the hand, a dielectric constant close to that of water, is enough to alter the net capacitance of a tuned circuit within the radio, where that circuit affects the tuning of the RF signal being demodulated by that radio. In 1973 Riechmann (U.S. Patent No. 3,743,865) described a circuit which used two antenna structures to detect an intrusion in the effective space of the antennae.
Frequency and
2 amplitude of a relaxation oscillator were affected by affecting the value of its timing capacitor.
The capacity (C) is defined as the charge (Q) stored on separated conductors with a voltage (V) difference between the conductors:
C=QN.
For two infinite conductive planes with a charge per unit area of o, a separation of d, with a dielectric constant e of the material between the infinite conductors, the capacitance of an area A is given by:
C=eAo/d Thus, where part of the separating material has a dielectric constant E i and part of the material has the dielectric constant E2, the net capacity is:
C = EiAio/d + e2A2o/d The human body is about 70% water. The dielectric constant of water is 7.18 x 100 farads/meter compared to the dielectric constant of air (STP):
8.85 x 10'12 farads/meter. The dielectric constant of water is over 80 times the dielectric constant of air. For a hand thrust into one part of space between the capacitor plates, occupying, for example, a hundredth of a detection region between large, but finite parallel conducting plates, a desirable detection ability in terms of the change in capacity is about 104 ' About 10'2 is contributed by the difference in the dielectric constants and about 10'2 is contributed by the "area" difference.
Besides Riechmann (1973), other circuits have been used for, or could be used for proximity sensing.
An important aspect of a proximity detector circuit of this type is that it be inexpensive, reliable, and easy to manufacture. A circuit made of a few parts tends to help with reliability, cost and ease of manufacture. Another desirable characteristic for electronic circuits of this type is that they have a high degree of noise immunity, i.e., they work well in an environment where there may be electromagnetic noise and interference. Consequently a more noise-immune circuit will perform better and it will have acceptable performance in more areas of appiication.
The capacity (C) is defined as the charge (Q) stored on separated conductors with a voltage (V) difference between the conductors:
C=QN.
For two infinite conductive planes with a charge per unit area of o, a separation of d, with a dielectric constant e of the material between the infinite conductors, the capacitance of an area A is given by:
C=eAo/d Thus, where part of the separating material has a dielectric constant E i and part of the material has the dielectric constant E2, the net capacity is:
C = EiAio/d + e2A2o/d The human body is about 70% water. The dielectric constant of water is 7.18 x 100 farads/meter compared to the dielectric constant of air (STP):
8.85 x 10'12 farads/meter. The dielectric constant of water is over 80 times the dielectric constant of air. For a hand thrust into one part of space between the capacitor plates, occupying, for example, a hundredth of a detection region between large, but finite parallel conducting plates, a desirable detection ability in terms of the change in capacity is about 104 ' About 10'2 is contributed by the difference in the dielectric constants and about 10'2 is contributed by the "area" difference.
Besides Riechmann (1973), other circuits have been used for, or could be used for proximity sensing.
An important aspect of a proximity detector circuit of this type is that it be inexpensive, reliable, and easy to manufacture. A circuit made of a few parts tends to help with reliability, cost and ease of manufacture. Another desirable characteristic for electronic circuits of this type is that they have a high degree of noise immunity, i.e., they work well in an environment where there may be electromagnetic noise and interference. Consequently a more noise-immune circuit will perform better and it will have acceptable performance in more areas of appiication.
3 SUMMARY OF THE INVENTION
The invention comprises to a carousel-based dispensing system for paper towels, in particular, which acts to minimize actual wastage of paper towels.
The invention comprises means for holding and positioning at least first and second rolls of paper with respect to each other, means for dispensing paper from the first roll, means for dispensing paper from the first and second rolls sirriultaneously when the first roll reduces to a predetermined diameter of paper, means for positioning the depleted first roll for replacement without the necessity of removing the second roll and means for dispensing from the second and replacetrient rolls simultaneously when the second roll reduces to a predetermined dianieter of paper.
A proximity sensor embodiment comprises a circuit according to a balanced bridge principle where detection is based on detecting a phase difference, which depends upon the amount of detected capacitance difference or change of capacitance in a region of detection.
A second embodiment of this invention comprises a second electronic proximity sensor. The second detector circuit is a miniaturized, micro-capacitance-based proximity sensor designed to detect the approach of a powered, hand to a towel dispenser. It features stable operation and a three-position sensitivity selector.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
Figure 1 is a side elevation of the dispenser with the cover closed, with no internal mechanisms visible;
Figure 2 is a perspective view of the dispenser with the cover closed, with no internal mechanisms visible;
Figure 3 shows a view of the carousel support, the locking bar and the transfer bar;
Figure 4A is a perspective view of the of the dispenser with the carousel and transfer bar, fiilly loaded with a main roll and a stub roll;
The invention comprises to a carousel-based dispensing system for paper towels, in particular, which acts to minimize actual wastage of paper towels.
The invention comprises means for holding and positioning at least first and second rolls of paper with respect to each other, means for dispensing paper from the first roll, means for dispensing paper from the first and second rolls sirriultaneously when the first roll reduces to a predetermined diameter of paper, means for positioning the depleted first roll for replacement without the necessity of removing the second roll and means for dispensing from the second and replacetrient rolls simultaneously when the second roll reduces to a predetermined dianieter of paper.
A proximity sensor embodiment comprises a circuit according to a balanced bridge principle where detection is based on detecting a phase difference, which depends upon the amount of detected capacitance difference or change of capacitance in a region of detection.
A second embodiment of this invention comprises a second electronic proximity sensor. The second detector circuit is a miniaturized, micro-capacitance-based proximity sensor designed to detect the approach of a powered, hand to a towel dispenser. It features stable operation and a three-position sensitivity selector.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
Figure 1 is a side elevation of the dispenser with the cover closed, with no internal mechanisms visible;
Figure 2 is a perspective view of the dispenser with the cover closed, with no internal mechanisms visible;
Figure 3 shows a view of the carousel support, the locking bar and the transfer bar;
Figure 4A is a perspective view of the of the dispenser with the carousel and transfer bar, fiilly loaded with a main roll and a stub roll;
4 Figure 4B is a side view of the locking bar showing the placement of the compression springs;
Figure 4C shows the locking mechanism where the locking bar closest to the rear of the casing is adapted to fit into a mating structure in the rear casing;
Figure 5 is a perspective, exploded view of the carousel assembly;
Figure 6A is a side elevation view of the paper feeding from the stub roll while the tail of the main roll is positioned beneath the transfer bar;
Figure 6B is a side elevation view of the stub roll is completely exhausted, so that the transfer bar tucks the tail of the main roll into the feed mechanism;
Figure 7A is a side elevation view of the carousel ready for loading when the main roll reaches a specific diameter;
Figure 7B is a side elevation view of the locking bar being pulled forwardly to allow the carousel to rotate 180 , placing the main roll in the previous stub roll position;
_. Figure 7C .shows .the extension spxings which tend to. maintain the transfer bar legs in contact with the stub roll;
Figure 7D shows the cleanable floor of the dispenser;
Figure 8A shows a schematic of the proximity circuit;
Figure 8B (prior art) shows the schematic for the National Semiconductor dual comparator LM393;
Figure 9A shows the square wave output at U1A, pin 1;
Figure 9B shows the RC exponential waveforms at pins 5;
Figure 9C shows the RC exponential waveforms at pin 6;
Figure 10 shows a schematic of a second proximity switch;
Figure l0A shows the asymmetric oscillator and the first static protection circuit;
Figure 10B shows the antenna, the antenna reset circuit, a second static protection circuit, the antenna buffer unity follower circuit; and the peak detector circuit; and a peak detector circuit;
Figure lOC shows the low pass filter for rejecting 50/60 Hz, the amplifier circuit, and.the test points for adjusting VRI to 3.0 V with all eternal capacitance-like loads in place;
Figure lOD shows the auto-compensate capacitor, the 50/60 Hz reject capacitor, and the output comparator which will produce an output pulse for signals which have passed all the rejection tests; these tests designed to prevent spurious signals from setting otf an output pulse; and Figure l0E shows a sensitivity select switch and circuit.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The following description is of the best mode presently contemplated for carrying out the invention. This description is not to be taken in a limiting sense, but is merely made for the purpose of describing the general principles of the invention. The scope of the invention should be determined with reference to the claims.
An embodiment of the invention comprises a carousel-based dispensing system with a transfer bar for paper towels, which acts to minimize actual wastage of paper towels. As an enhancement and further development of a system for delivering paper towel to the end user in a cost effective manner and in as user-friendly manner as possible, an automatic means for dispensing the paper towel is desirable, making it unnecessary for a user to physically touch a knob or a lever. An electronic proximity sensor is included as part of the paper towel dispenser.
A person can approach the paper towel dispenser, extend his or her hand, and have the proximity sensor detect the presence of the hand. The embodiment of the invention as shown here, is a system, which advantageously uses a minimal number of parts for both the mechanical structure and for the electronic unit. It has, .
therefore, an enhanced reliability and maintainability, both of which contribute to cost effectiveness.
An embodiment of the invention comprises a carousel-based dispensing system with a transfer bar for paper towels, which acts to minimize actual wastage of paper towels. The transfer bar coupled with the carousel system is easy to load by a service person; consequently it will tend to be used, allowing stub rolls to be fully utilized. In summary, the carousel assembly-transfer bar comprises two components, a carousel assembly and a transfer bar. The carousel rotates a used-up stub roll to an up position where it can easily be replaced with a full roll.
At the same time the former main roll which has been used up such that its diameter is less than some p inches, where p is a rational number, is rotated down into the stub roll position. The tail of the new main roll in the upper position is tucked under the "bar"
part of the transfer bar. As the stub roll is used up, the transfer bar moves down under spring loading until the tail ot'tlie main roll is engaged between the feed roller and the nib roller. The carousel assembly is symmetrical about a horizontal axis. A
locking bar is pulled out to unlock the carousel assembly and allow it to rotate about its axis, and is then released under its spring loading to again lock the carousel assembly in place.
A side view, Figure 1, of the dispenser 20 with the cover 22 in place shows an upper circular bulge 24, providing room for a full roll of paper towel, installed in the upper position of the carousel. The shape of the dispenser is such that the front cover tapers inwardly towards the hottom to provide a smaller dispenser volume at the bottom wllere there is a smaller stub roll of paper towel. The shape tends to minimize the overall size of the dispenser. Figure 2 shows a perspective view of the dispenser 20 with cover 22 in place and the circular (cylindrical) bulge 24, together with the sunrise-like setback 26 on the cover 22, which tends to visually guide a hand toward the pseudo-button 28, leading to activation of a proximity sensor (not shown). A light emitting diode (LED) 130 is located centrally to the pseudo-button 28. The LED 130 (Fig. 3) serves as an indication that the dispenser 20 is on, and dispensing towel. The LED 130 may be off while the dispenser is not dispensing.
Alternatively, the LED 130 may be lit (on), and when the dispenser 20 is operating, the LED 130 might flash. The LED 130 might show green when the dispenser 20 is ready to dispense, and flashing green, or orange, when the dispenser 20 is operating to dispense. Any similar combination may be used. The least power consumption occurs when the LED 130 only lights during a dispensing duty cycle. The sunrise-like setback 26 (Fig. 2) allows a hand to come more closely to the proximity sensor (not shown).
Fibure 3 shows the main elements of the carousel assembly 30.
The carousel arms 32 have friction reducing rotating paper towel roll hubs 34, which are disposed into the holes of a paper towel roll (66, 68, Fig. 4A). The locking bar 36 serves to lock and to release the carousel for rotation about its axis 38. The locking bar 36 rides on one of the corresponding bars 40. The two corresponding bars serve as support bars. Cross-members 42 serve as stiffeners for the carousel assembly 30. and also serve as paper guides for the paper to be drawn over and down to the feed roller 50 and out the dispenser 20. These cross members are attached in a rigid tasliion to the corresponding bars 40 and in this embodiment do not rotate.
The legs 46 of the transfer bar 44 do not rest against the friction reducing rotating paper towel roll hubs 34 when there is no stub roll 68 present but are disposed inward of the roll hubs 34. The bar part 88 of the transfer bar 44 will rest against a structure of the dispenser, for example, the top of modular electronics unit 132, when no stub roll 68 is present. The bar part 88 of the transfer bar 44 acts to bring the tail of a new main roll of paper towel 66 (Fig. 4A) down to the feed roller 50 which includes intermediate bosses 146 (Fig. 3) and shaft 144. The carousel assembly is disposed within the fixed casing 48. The cover is not shown.
Feed roller 50 serves to feed the paper towels 66, 68 (Fig. 4A) being dispensed onto the curved dispensing ribs 52. The curved dispensing ribs are curved and have a low area of contact with the paper towel dispensed (not shown).
If the dispenser 20 gets wet, the curved dispensing ribs 52 help in dispensing the paper towel to get dispensed by providing low friction and by holding the dispensing towel off of the wet surfaces it would otherwise contact.
The feed roller 50 is typically as wide as the paper roll, and includes drive rollers 142 and intermediate bosses 146 on the drive shaft 144.
The working drive rollers or drive bosses 142 (Fig. 3) are typically an inch or less. in width, with intermediate bosses 146 (Fig. 3) located between them:
Intermediate bosses 146 are slightly less in diameter than the drive rollers or drive bosses 142, having a diameter 0.0 15 to 0.045 inches less than the drive rollers or drive bosses 142.
In this embodiment, the diameter of the intermediate bosses 146 is 0.030 inches le.ss. ,, ..
than the drive roller 142. This configuration of drive rollers or drive bosses 142 and intermediate bosses 146 tends to prevent the dispensing paper towel from becoming wrinkled as is passes through the drive mechanism and reduces friction, requiring less power to operate the feed roller 50.
A control unit 54 operates a motor 56. Batteries 58 supply power to the motor 56. A motor 56 may be positioned next to the batteries 58. A
light 60, for example, a light-emitting. diode (LED), may be incorporated into a low battery warning such that the light 60 turns on when the battery voltage is lower than a predetermined leveL
The cover 22 of the dispenser is preferably transparent so that the amount of the main roll usecl (see below) may be inspected, but also so that the battery low light 60 may easily be seen. Otherwise an individual window on an opaque cover 22 would need to be provided to view the low battery light 60.
Another approaclt might be to lead out the liglit by way of a fiber optic light pipe to a transparent window in the cover 22.
In a waterproof version of the dispenser, a thin piece of foam rubber rope is disposed witliin a u-shaped groove of the tongue-in-groove mating surfaces of the cover 22 and the casing 48. . The dispensing shelf 62 is a modular component, which is removable from the dispenser 20. In the waterproof version of the dispenser 20, the dispensing shelf 62 with the molded turning ribs 52is removed.
By removing the modular component, dispensing shelf 62, there is less likelihood of water being diverted into the dispenser 20 by'the dispensing shelf 62, acting as a funnel or chute should a water hose or spray be directed at the dispenser 20, by the shelf and wetting the paper towel. The paper towel is dispensed straight downward.
A most likely need for a waterproof version of the dispenser is where a dispenser is located in an area. subject to being cleaned by being hosed down. The dispenser 20 has an on-off switch which goes to an off state when the cover 22 is pivoted ..___dowttwardl.y. The_actual_ switch is located on the lower face of the nodule 54 and is not shown.
In one embodiment, the user may actuate the dispensing of a paper towel by placing a hand in the dispenser's field of sensitivity. There can be adjustable delay lengths between activations of the sensor.
There is another aspect of the presence of water on or near the dispenser 20. A proximity sensor (not visible) is, more fully discussed below, including the details of its operation. However, as can be appreciated, the sensor detects changes of capacitance such as are caused by the introduction of an object with a high dielectric constant relative to air, such as water, as well as a hand which is about 70% water. An on-off switch 140 is provided which may be turned off before hosing down and may be turned on manually, afterwards. The switch 140 may also work such that it turns itself back on after a period of time, automatically.
The switch 140 may operate in both modes, according to mode(s) chosen by the user.
A separate "jog" off-on switch 64 is provided so that a maintenance person can thread the paper towel 66 by holding a spring loaded jog switch 64 which provides a temporary movement of the feed roller 50.
Figure 4A shows the dispenser case 48 with the carousel assembly 30 and transfer bar 44. The carousel assembly 30 is ftilly loaded witli a main roll 66 and a stub roll 68, both mountecl on the carousel arms 32 and rotate on the rotating reduced friction paper towel roll hubs 34 (only shown from the back of the carousel arms 32). In the carousel assembly 30, the two carousel arms 32, joined by corresponding bars 40 and cross members 42, rotate in carousel fashion about a horizontal axis defined by the carousel assembly rotation hubs 38. The locking bar 36 is supported, or carried, by a corresponding bar 40. The corresponding bar 40 provides structural rigidity and support. The locking bar 36 principally serves as a locking mechanism. Each paper towel roll 66, 68 has an inner cardboard tube which acts as a central winding core element, and which provides in a hole in paper towel roll 66, 68 at each end for engaging the hubs 34.
Figure 5 shows the carousel assembly 30 in exploded, perspective view. The number of parts comprising this assembly is small. From a reliability point of view, the reliability is increased. From a manufacturing point of view, the ease of manufacture is thereby increased and the cost of manufacture is reduced. The __.material _of manufacture is not, limited except as to the requirements of cost, ease of manufacture, reliability, strength and other requirements imposed by the maker, demand.
When the main roll, 66 (Fig. 4A) and the stub roll 68, (Fig. 4A) are in place, the carousel arms 32 are connected by these rolls 66 and 68 (Fig.
4A).
Placing cross-members 42 to connect the carousel arms 32 with the locking 36 and corresponding 40 bar results in better structural stability, with racking prevented. The locking bar 36, which was shown as a single unit locking bar 36 in the previous figures, acts as a locking bar 36 to lock the carousel assembly 30 in the proper orientatibn. It acts also as the release bar, which when released, allows the carousel assembly 30 to rotate. Two compression springs 70, 72 are utilized to center the locking bar 36.
Figure 4B is a side view of the locking bar showing the placement of the compression springs. The compression springs 70, 72 also tend to resist the release of the locking bar 36, insuring that a required force is needed to unlock the locking bar 36. The required force is typically between 0.5 lbf and 3Ø lbf, or more.
In this embodiment, the force is 2.0 lbf when the spring in a fully compressed position, and 1.1 lbf when the spring is in the rest position. In the rest position, the forces of the opposing springs offset each other.
The actual locking occurs as shown in Figure 4C. The locking bar 36 closest to the rear of the casing 48 is adapted to fit into a generally u-shaped mating structure 118 which is adapted to hold the locking bar 36 and prevent it and the carousel assembly 30 from rotating. When the locking bar 36 is pulled away from the rear of the casing 48, the locking bar 36 is disengaged from the mating structure 118. The mating structure has an upper "high" side 120 and a lower "low" side 122, where the low side has a "ramp" 124 on its lower side. As the locking bar 36 is pulled out to clear the high side 120, the carousel assembly 30 is free to rotate such that the top of the carousel assembly 30 rotates up and away from the back of the casing 48.
As the carousel assembly 30 begins to rotate, the user releases the locking bar 36 which, under the influence of symmetrically placed compression springs 70, 72 returns to its rest position. As he carousel assembly rotates, the end of the symmetrical locking bar 36 which originally was disposed toward the user now rotates and contacts the ramp 124. A locking bar spring, e.g., 70 or 72, is compressed as the end of the locking bar 36 contacting the ramp 124 now moves up the ramp 124.
The end of the locking bar 36 is pressed into the space between the low side 122 and the high side 120, as the end of the locking bar 36 slides past the low side 122. A
locked position for the carousel assembly 30 is now reestablished.
Figure 5 shows the carousel arms 32 adapted to receive the loading of a new roll of towel 66 (Fig. 4A). The arms 32 are slightly flexible and bent outward a small amount when inserting a paper towel roll 66 (Fig. 4A) between two opposite carousel arms 32. A friction reducing rotating paper towel roll hub 34 is inserted into a hole of a paper towel roll 66 (Fig. 4A), such that one roll hub 34 is inserted into a hole on each side of the paper towel roll 66 (Fig. 4A). Also shown in Figure 5 are the tamper resistant fasteners 74, which attach the friction-reducing rotating paper towel roll hubs 34 to the carousel arms 32.
Figure 5 shows the surface 76 of the roll hubs 34 and the surface 78 of the carousel arms 66, which contact each other. These contact surfaces 76, 78 may be made of a more frictionless material than that of which the carousel arms 32 and the roll hubs 34 are made. For example, a plastic such as polytetrafluoroethylene (PTFE), e.g., TEFLON OO , may be used, as a thin layer on each of the contacting surfaces. The paper towel dispenser 20 and its components may be made of, including but not limited to, plastic, metal, an organic material which may include but is not Iimited to wood, cardboard, treated or untreated, a combination of these materials, and other materials for batteries, paint, if any, and waterproofing.
Figure 6A sllows the paper 80 feeding from the stub roll 68 while the tail 82 of the main roll 66 is positioned beneath the transfer bar 44. The legs (visible leg 46, other leg not shown) of the transfer bar 44 rests against the stub roll.
When the diameter of the stub roll 68 is larger by a number of winds of paper towel than the inner roll 84, the legs 46 of the transfer bar 44 dispose the bar 88 of the transfer bar 44 to be rotated upward from the feed roller 50.
Figure 6B shows the situation where the stub roll 68 is exhausted, so that the transfer bar 44 tucks the tail 82 of the main ro1166 into the feed mechanism 86. Figure 6B shows the stub roll 68 position empty, as the stub roll has been used up. The stub roll core 84 is still in place, As the stub ro1168 is used up, the legs 46 of the transfer bar 44 move up toward the stub roll core (inner roll) 84, and the bar 88 of the transfer bar is disposed downward toward the feed roller 50 and toward the top of a structural unit o-t the dispenser 20 (Fig. 2), such as the top of the electronics module 132__(Fig._3). _Initially the main roll 66is in reserve, and its tail 82 in an "idling"
position such that it is under the transfer bar 44. The main roll 66 and its tail 82 are not initially in a "drive" position. However, as the stub roll 68 is used up, the downward motion of the bar transfer bar, 44 driven by its spring loading, brings the bar 88 of the transfer bar 44 down to engage the main roll tail 82 with the feed roller 50.
Figure 7A shows the carousel. assembly 30 ready for loading when the main roll 66 reaches a specific diameter. The diameter of the main roll 66 may be measured by comparison of that diameter with the widened "ear" shape 122 (Fig.
4A) on each end of the carousel arms 32. That part of each carousel arm 32 is made to measure a critical diameter of a main roll 66. The carousel assembly 30 is tilted forward when it is locked. The carousel assembly 30 may rotate unassisted after the locking bar 36 is released, due to the top-heavy nature of the top roll. That is, the torque produced by the gravitational pull on the main-ro1166 is larger than that needed to overcome friction and the counter-torque produced by the now empty stub roll 68.
Figure 7B shows the process of loading where the service person pulls the locking bar 3.6 and allows the carousel to rotate 180 , placing the main roll 66 in the previous stub roll 68 position. Now a new full sized roll 66 can be loaded onto the main roll 66 position. The transfer bar 44 automatically resets itself. The transfer bar 44 is spring loaded so as to be disposed with the transfer bar legs 46 pressed upward against the stub roll 68 or the stub roll core 84. The transfer bar legs 46 are adapted to be disposed inward of the roll hubs 34 so the bar 88 of the transfer bar 44 will have a positive stop at a more rigid location, in this case, the top of the electronics module 132 (Fig. 2).
Figure 7C shows the extension springs 126, 128 which tend to maintain the transfer bar legs 46 in contact with the stub roll 68 or stub roll core 84.
The transfer bar 44 contains the two extension springs 126, 128. The spring forces are typically 0.05 lbf to 0.5 lbf in the bar 44 lowered position and 0.21bf to 1.0 lbf in the bar 44 raised position. In this embodiment, the spring forces are 0.2 lbf in the lowered position an 0.43 lbf in the raised position. The force of the two springs 126, 128 is additive so that the transfer bar 44 is subject to a total spring force of 0.4 lbf in the lowered position and 0.86 lbf in the raised position.
While modular units (Fig. 7D) such as the electronics module 132, the motor 56 module, and the battery case 150, are removable, they fit, or "snap"
together so that the top of the electronics unit 132, the top of the motor 56 module and remaining elements of the "floor" 148 of the dispensing unit 20 form a smooth, cleanable surface: Paper dust and debris tend to accumulate on the floor 148 of the dispenser 20. It is important that the dispenser 20 is able to be easily cleaned as part of the maintenance procedure. A quick wiping with a damp cloth will sweep out and pick up any undesirable accumulation. The removable modular dispensing shelf may be removed for rinsing or wiping.
The feed roller 50 may be driven by a motor 56 which in turn may be driven by a battery or batteries 58, driven off a 100 or 220V AC hookup, or driven off a transformer which is run off an AC circuit. The batteries may be non-rechargeable or rechargeable. Rechargeable batteries *may include, but not be limited to, lithium ion, metal hydride, metal-air, nonmetal-air. The rechargeable batteries may be recharged by, but not liniited to, AC electromagnetic induction or light energy using photocells.
A feed roller 50 serves to feed the paper towel being dispensed onto the curved dispensing ribs 52. A gear train (not visible) may be placed under housing 86, (Fig. 3) for driving the feed roller. A control unit 54 (Fig. 3) for a motor 56 (Fig. 3) may be utilized. A proximity sensor (not shown) or a hand-operated switch 64 may serve to turn the motor 56 on and off.
As an enhancement and further development of a system for delivering paper towel to the end user in as cost effective manner and user-friendly manner as possible, an automatic means for dispensing the paper towel is desirable, making it unnecessary for a user to physically touch a knob or a lever.
Therefore, a more hygienic dispenser is present. This dispenser will contribute to less transfer of matter, whether dirt or bacteria, from one user to the next. The results of washing ones hands will tend to be preserved and hygiene increased.
An electronic proximity sensor is included as part of the paper towel dispenser. A person can approach the paper towel dispenser, extend his or her hand, and have the proximity sensor detect the presence of the hand. Upon detection of the hand, a motor is energized which dispenses the paper towel. It has long been known that the insertion of an object with a dielectric constant into a volume with an electromagnetic field will tend to modify the properties, -which the electromagnetic field sees. The property of the hand, a dielectric constant close to that of water, is enough_to_ alter the net capacitance of a suitable detector circuit.
An embodiment of the invention comprises a balanced bridge circuit. See Figure 8A. The component UIA 90 is a comparator (TLC3702 158) configured as an oscillator. The frequency of oscillation of this component, U1A 90, of the circuit may be considered arbitrary and non-critical, as far as the operation of the circuit is concerned. The period of the oscillator is set by the elements Cref 92, Rhys 94, the trim resistance, Rtrim 96, where the trim resistance may be varied and the range resistors Rrange 152 are fixed. The resistors Rrange 152 allow limits to be placed on the range of adjustment, resulting in an easier adjustment. The adjustment band is narrowed, since only part of the total resistance there can be varied.
Consequently a single potentiometer may be used, simplifying the adjustment of Rtrim 96. A value for Rrange 152 for the schematic shown in Figure 8A might be 100 kS2. Rtrim 96 might have an adjustment range of 10 kSa to 50.kS2. The output signal at pin 1 98 of component U1A 90 is a square wave, as shown in Figure 9A.
Cref 92 is charged by the output along with ANT 100, both sustaining the oscillation and measuring the capacitance of the adjacent free space. The signals resulting from the charging action are applied to a second comparator, U 1 B 102, at pin 5 104 and pin 6 106 (Fig. 8A). These signals appear as exponential waveforms, as shown in Figure 9B and Figure 9C.
The simplest form of a comparator is a high-gain differential amplifier, made either with transistors or with an op-amp. The op-amp goes into positive or negative saturation according to the difference of the input voltages because the voltage gain is typically larger than 100,000, the inputs will have to be equal to within a fraction of a millivolt in order for the output not to be completely saturated. Although an ordinary op-amp can be used as comparator, there are special integrated circuits intended for this use. These include the LM 306, LM311, 154 (Fig. 8A), LM393V, NE627 and TLC3702 158. The LM393V is a lower voltage derivative of the LM393 154. The LM393 154 is an integrated circuit containing two comparators. The TLC3702 158 is a micropower dual comparitor with CMOS push-pull 156 outputs. Figure 8B (prior art) is a schematic which shows the different output structures for the LM393 and the TLC3702. The dedicated comparators are much faster than the ordinary op-amps.
The output signal at pin 1 98 of component U1A 90, e.g., a TL3702 158, is a square wave, as shown in Figure 2A. Two waveforms are generated at the inputs of the second comparator, U2B 102. The first comparator 90 is running as an oscillator producing a square-wave clocking signal, which is input, to the clock input of the flip-flop U2A 108, which may be, for example, a Motorola D flip-flop, No.
14013.
Running the first comparator as a Schmitt trigger oscillator, the first comparator U1A 90 is setup to have positive feedback to the non-inverting input, terminal 3 110. The positive feedback insures a rapid output transition, regardless of the speed of the input waveform. Rhys 94 is chosen to produce the required hysteresis, together with the bias resistors Rbiasl 112 and Rbias2 114. When these two bias resistors, Rbias 1 112, Rbias2 114 and the hysteresis resistor, Rhys 94, are equal, the resulting threshold levels are 1/3 V+ and 2/3 V+, where V+ 158 is the supply voltage. The actual values are not especially critical, except that the three resistors Rbias 1 112, Rbias2 114 and Rhys 94, should be equal, for proper balance.
The value of 294 kSZ maybe used for these three resistors, in the schematic shown in Figure 8A.
An external pullup resistor, Rpullup l 116, which may have a value, for example, of 47052, is only necessary if an open collector , comparator such as an LM393 154 is used. That comparator 154 acts as an open-collector output with a ground-coupled einitter. For low power consumption, better performance is achieved with a CMOS comparator, e.g., TLC3702, which utilizes a cmos push-pull output 156. The signal at terminal 3 110 of U1A charges a capacitor. Cref 92 and also charges an ANT sensor 100 with a capacitance which Cref 92 is designed to approximate. A value for Cref for the schematic of Figure 8A, for the most current board design, upon which it depends, is about 10 pF. As the clocking square wave is effectively integrated by Cref 92 and the capacitance of ANT 100, two exponential signals appear at terminals 5 104 and 6 106 of the second comparator U1B, through the Rprotect 160 static protection resistors. Rprotect 160 resistors provide limiting resistance which enhances the inherent static protection of a comparitor input lines, particularly for the case of pin 5 104 of U 1 B 102. In the schematic shown in Figure 8A, a typical value for Rprotect 160 might be 2 W. One of the two exponential waveforms will be greater, depending upon the settings of the adjustable resistance Rtrim_-96,_.Cref_92,_.._and..ANT 100. .The comparator U1B 102 resolves small differences, reporting logic levels at its output, pin7 118. As the waveforms may initially be set up, based on a capacitance at ANT 100 of a given amount.
However, upon the intrusion of a hand, for example, into the detection field of the antenna ANT
100, the capacitance of ANT 100 is increased significantly and the prior relationship of the waveforms, which were set with ANT 100 with a lower capacitance, are switched over. Therefore, the logic level output at pin 7 118 is changed and the d flip-flop 108 state is changed via the input on pin 5 of the D flip-flop 108.
The second comparator 102 provides a digital quality signal to the D flip-flop 108. The D flip-flop, U2A 108, latches and holds the output of the comparator UIB 90. In this manner, the second comparator is really doing analog-to-digital conversion. A suitable D flip-flop is a Motorola 14013.
The presence, and then the absence, of a hand can be used to start a motorized mechanism on a paper towel dispenser, for example: An embodiment of the proximity detector uses a single wire or a combination of wire and copper foil tape that is shaped to form a detection field. This system is very tolerant of non-conductive items, such as paper towels, placed in the field. A hand is conductive and attached to a much larger conductor to free space. Bringing a liand near the antenna serves to increase the antenna's apparent capacitance to free space, forcing detection.
The shape and placement of the proximity detector's antenna (Fig.
8A, 100) huns out to be of some importance in making the proximity sensor work correctly. Experimentation showed that a suitable location was toward the lower front of the dispenser unit. The antenna (Fig. 8A, 100) was run about two-thirds the length of the dispensing unit, in a modular, replaceable unit above the removable dispensing shelf 62 (Fig. 3). This modular unit would be denoted on Figure 3 as 120.
A detection by the proximity detection circuit (Fig: 8AY in the module 120 sets up a motor control flip flop so that the removal of the hand will trigger the start of the motor cycle. The end of the cycle is detected by means of a limit switch which, when closed, causes a reset of the flip-flop and stops the motor. A
cycle may also be initiated by closing a manual switch.
A wide range of sensitivity can be obtained by varying the geometry of the antenna and coordinating the reference capacitor. Small antennae have short ranges. suitable for non-contact pushbuttons. A large antenna could be disposed as a doorway-sized people detector. .Another factor in sensitivity is the element applied as Rtrim. If Rtrim 96 is replaced by an adjustable inductor, the exponential signals become resonant signals with phase characteristics very strongly influenced by capacitive changes. Accordingly, trimming with inductors may be used to increase range and sensitivity. Finally, circuitry may be added to the antenna 100 to improve range and directionality. As a class, these circuits are termed "guards" or "guarding electrodes," old in the art, a type of shield driven at equal potential to the antenna. Equal putential insures no charge exchange, effectively blinding the guarded area of the antenna rendering it directional.
The antenna design and trimming arrangement for the paper towel dispenser application is chosen for adequate range and minimum cost. The advantages of using a guarded antenna and an adjustable inductor are that the sensing unit to be made smaller.
From a safety standpoint, the circuit is designed so that a detection will hold the motor control flip-flop in reset, thereby stopping the mechanism. The cycle can then begin again after detection ends.
The . dispenser has additional switches on the control module 54.
Figure 3 shows a "length-of-towel-to-dispense-at-one-time" (`length")switch 134.
This switch 134, is important in controlling how long a length of paper towel is dispensed, for each dispensation of towel. It is an important setting for the owner of the dispenser on a day-to-day basis in determining cost (to the owner) versus the comfort (to the user) of getting a large piece of paper towel at one time.
A somewhat similar second switch 136 is "time-delay-before-can-activate-the-dispensing-of another-paper-towel" ("time-delay") switch 136. The longer the time delay is set, the less likely a user will wait for many multiple towels to dispense. This tends to save costs to the owner. Shortening the delay tends to be more comfortable to a user.
A third switch 138 is the sensitivity setting for the detection circuit.
This sensitivity setting varies the resistance of Rtrim 96 (Fig. 8A). Once an effective antenna 100 (Fig. 8A) configuration is set up, the distance from the dispenser may be varied. Typical actual use may require a sensitivity out to one or two inches, rather than four or six inches. This is to avoid unwanted dispensing of paper towel.
In a hospital setting, or physician's office, the sensitivity setting might be made fairly low so as to avoid unwanted paper towel dispensing. At a particular work location, on the other hand, the sensitivity might be set _fairly high, so that paper towel will be dispensed very easily.
While it is well known in the art how to make these switches according to the desired fiinctionalities, this switch triad may increase the usefulness of the embodiment of this invention. The system, as shown in the embodiment herein, has properties of lowering costs, improving hygiene, improving ease of operation and ease of maintenance. This embodiment of the invention is designed to consume low power, compatible with a battery or battery pack opeXation. In this embodiment, a 6 volt DC supply is utilized. A battery eliminator may be use for continuous operation in a fixed location. There is a passive battery supply monitor that will turn on an LED indicator if the input voltage falls below a specified voltage.
A second embodiment of this invention comprises a second electronic proximity sensor. The second detector circuit is a miniaturized, micro-powered, capacitance-based proximity sensor designed to detect the approach of a hand to a towel dispenser. It features stable operation and a three-position sensitivity selector.
Figure 10 shows the whole proximity detector circuit. In order to examine the circuit more carefully, Figure 10 is broken out into sections 10A
through 10E. These component circuits are shown separately as Figures l0A through 10E, corresponding to the breakout sliown in Figure 10.
At the heart of the proximity detector is an adjustable asymmetric rectangular wave oscillator running in a range of 24 kHz to 40kHz, as shown in Figure IOA. Once an initial adjustment has been set it is not readjusted during operation, normally. The asymmetrical feature of having a longer on-time and shorter off-time allows for more useable signal, i.e., on-time. This 24 kHz to 40kHz oscillation range provides a basis for a high rate of sampling of the environment to detect capacitance changes, as detailed below. As shown, a fast comparator, 200, has positive feedback through XR18 202 from the output terminal 1 204 (XU2A) to the positive input terminal 3 206 (XU2A). The comparator operates as a Schmitt trigger oscillator with positive feedback to the non-inverting input, terminal. The positive feedback insures a rapid output transition, regardless of the speed of the input waveform. As the capacitor XC6 208 is charged up, the terminal 3 206 of the 200 comparator reaches 2/3 XVDD. This voltage 2/3 XVDD is maintained on terminal 3 206 by the voltage dividing network XR17 212 and XR20 214, and the positive feedback resistor XR18 202 thatis in parallel with XR17 212, where XR17 212 and XR20 214 and XR18 202 are all equal resistances. The simplest form of a comparator is a high-gain differential aniplifier, made either with transistors or with an op-amp.
The op-amp goes into positive or negative saturation according to the difference of the input voltages because the voltage gain is typically larger than 100,000, the inputs will have to be equal to within a fraction of a millivolt in order for the output not to be completely saturated. Although an ordinary op-amp can be used as comparator, there are special integrateci circuits intended for this use. For low power consumption, better performance is achieved with a CMOS comparator, such as a TEXAS
1NSTRUMENT T'LC3702CD 158 (Figure 8B). The TLC 3702 158 is a micropower dual coniparator with CMOS push-pull 156.(Figure. 8B) outputs.
These dedicated comparators are niuch faster than the ordinary op-amps.
As the transition occurs, the output, at the output terminal 1 204, goes relatively negative, XD5 216 is then in a forward conducting state, and the capacitor XC6 208 is preferentially discharged through the resistance XR15 218 (100kS2) and the diode XD5 216.
The time constant for charging the capacitor XC6 206 is determined by resistors XVRI 220, XR13 222 and XR15 218. The resistor XR15 218 and the diode XD5 216 determine the time constant for discharge of the capacitor XC6 208.
The reset tinie is fixed at 9 s by XD5 216 and XR15 218. The rectangular wave source supplying the exponential to the antenna, however, can be varied from 16 to 32 s, utilizing the variable resistance XVRI 220 and the resistors XR13 222 and XR15 218. Once set up for operational the variable resistance is not changed. The asymmetric oscillator can produce more signal (16 s to 32 s, as compared to the reset time. The reset time is not especially important, but the reset level is both crucial and consistent: The exponential waveform always begins one "diode voltage drop" (vbe) above the negative rail due 'to the forward biased diode voltage drop of XD2 224 (Figure l OB). One "diode.voltage drop" (vbe) is typically in the range 0.5 V to 0.8 V, or typically about 0.6 V.
The dual diode XD4 226 (Figure 10A) provides protection from static electricity. Terminal 1 228 of XD4 226 will conduct when terminal 3 230 is at least one diode voltage drop below the ground, or negative rail. Terminal 2 232 will conduct when terminal 3 230 is at least one diode voltage drop above VDD 234.
Therefore, the signal level at terminal 3 230 is limited to the range -vbe to VDD +
vbe, thereby eliminating voltage spikes characteristic of "static", which may be induced by lightening or the operation of electrical motors, for example. The static is primarily built up by the internal mechanisms of the towel dispenser and the movement of the paper and is discharged by bringing a waving hand near the sensor.
The asymmetric square wave charges the antenna 236 (Figure l OB) through the resistors XR9 238 and XR4 240. The sum resistance, XR, is equal to XR9 238 plus XR4 240, or 1.7 MS2, for the example values shown in_Figures 10 and IOB. The antenna 236 forms one conducting side of a capacitor, while the atmosphere and other materials form a dielectric between the antenna as one conducting element and other conductive materials including buildings and the actual earth as a second conductive element. The capacitance C of the antenna 236 relative to "free space" is approximately 7 pF to 8 pF, as determined by experiment, yielding a time constant T, where i is equal to RC. Thus, the time constant, for the exemplary values, is about 13 ELs.
If a hand of a person is placed in proximity to the antenna of the circuit, the capacitance of the antenna to free space may double to about 15 pF with a resultant longer time constant and lower amplitude exponential waveform. The time constant i is increased to about 26 s. While it is possible to directly compare the signals, it is also desirable to have as stable an operating circuit as possible while retaining a high sensitivity and minimizinb false positives and false negatives with respect to detection. To aid in achieving these goals, the signal is conditioned or processed first.
-Looking at the operational amplifier XU 1 A 242, the (signal) waveform sees very high impedance, since operational amplifiers have high input impedance. The impedance on the antenna 236 side of the operational amplifier 242, in the form of resistance, is about 1.9 M. The impedance on the other side of the operational amplifier is of the order of 5 kS2. In order to provide an impedance buffer the signal the operational amplifier UX1A 242 is set up as a unity follower with a voltage gain of 1.0, that is, the gain given by VoõtNiõ equals one. The unity follower has an input-side (of the operational amplifier) resistance of about 1.0 Tfl (1013 S2).
The (operational amplifier's) output impedance is in a range about 40 to 600 to several thousand ohms. Consequently, this unity follower configuration serves to isolate or buffer the upstream high-impedance circuit from the downstream low --impedance-circuit.
The resistor XR2 244 acts as a current limiter, since the current i is equal to v/XR2 at XR2 244. Further protection against static is provided by the diode pair XD3 246 in the same way as diode pair XD4 226 (Figure l0A). Terminal 1 of XD3 246 will conduct when terminal 3 250 is at least one diode voltage drop below the ground, or negative rail. Terminal 2 252 will conduct when terminal 3 250 is at least one diode voltage drop above VDD. Therefore, the signal level at terminal 3 250 is limited to the range -vbe to VDD + vbe, so that voltage spikes characteristic of "static" are eliminated.
Asymmetric oscillator pulses, after detecting capacitance which either includes or does not include a proximate dielectric equivalent to that of a proximate hand, act on the positive (non-inverting) input terminal 254 of the unity follower operational amplifier 242 to produce a linear output at its output terminal 256. The state of the output terminal is determined by first, the length of the asymmetric on pulse, and within the time of the "on" pulse, the time taken to charge up the antenna 236 (as capacitor) and the time to discharge through XR2 244 to the non-inverting input terminal 254. The time-constant-to-charge is 13 s to 26 s. The time-constant-to-discharge is 0.8 to 1.6 fLs. To cliarge the antenna 236 to a certain charge, Q, for a capacitance based on a dielectric constant for "free space"
of eo, i.e., CEO, a voltage of V = Q/CE,,.is required. For the case of a capacitance, i.e., CEp.,E, which includes a detectable hand in "free space," the voltage required to store charge Q is Q/CEprE. However, CE,,,E is about twice CE,,, so that the voltage peak for the detected hand is about half.of the no-hand-present case.
The diode XD 1 258 allows positive forward conduction but cuts off the negative backward conduction of a varying signal pulse. The forward current, or positive peak of the current, tends to charge the capacitor XC5 260. The diode XDI 258, the resistor XR8 262, the capacitor XC5 260 and the bleed resistor 264 comprise a peak detector network. .. XD 1 258 and XC5 260 capture the positive peak of the exponential waveform. XR8 262 prevents oscillation of XU 1 A 242.
262 limits the charging time constant to 5 ms, where XR8 262 is 4.99 kf2 and 260 is 0.1 F. This has an averaging effect on the peak detection and prevents noise spikes from pumping up the detector. The resistor XR10 264 discharges the-detector at a half-second time constant.
When-the. hand is detected, the stored charge on XC8 260 is such that the voltage is sufficient to raise the input to the non-inverting terminal 266 of operational amplifier XU 1 B 268 above %aXVDp, so as to drive that operational amplifier output to a usable linear voltage range.
The combination of the resistor XR1 270 (e.g., 499 kfl) and the capacitor XC1 272 (e.g., 0.1 F) comprise a low pass filter with a corner frequency of 1/XR1=XC1 (e.g., 20Hz), which corresponds to a time constant of XR1=XC1 (e.g., ms). This filter is for rejection of large 50Hz or 60Hz noise. These "high"
frequencies are effectively shorted to ground. It is particularly helpful when the towel dispenser proximity detector is powered from an AC-coupled supply. The ubiquitousness of the AC power frequency, however, makes this protection desirable, regardless.
The signal is next amplified by an operational amplifier XU1B
268, which has a gain of 22. The resistor XR5 277 serves as a feedback resistor to the negative (inverting) input terminal 279 of the operational amplifier 268.
There is a'/~
XVDD offset provided by the voltage divider network of XR3 274 and XR11 276.
The output rests against the negative rail until a peak exceeds V2 XVDD. The charge time adjustment XVRI becomes a very simple and sensitive way to adjust to this threshold. A setting of 3 V between test points XTP 1 278 and XTP2 280 is recominended. This adjustment is made with all external capacitive loads (i.e., plastic and metal components) in place.
The output comparator 282 (Figure l OD) is connected to the signal processing from the operational amplifier 268 (Figure lOC) by the auto-compensate capacitor XC3 284 (Figure lOD). This makes the circuit insensitive to DC
levels of signal, but sensitive to transients, e.g., a waving hand. As long as the charge-time adjustment function remains in a linear range, the sensitivity to a moving hand will be stable.
The capacitor XC4 286 allows the reference level (REF) 288 to track with approximately 50Hz or 60Hz noise on the SIGNAL 290 and not cause erroneous output pulses, since the AC noise will also track on the REF 288 (non-inverting) input to the comparator 282.
The output stage of the proximity detector is implemented as a variable threshold comparator, XU2B 282. The signal is set up with an offset voltage,.
where the resistors XR7 292 and XR12 294 are equal and divide the VDD voltage into two %2 VDD segments. Three sensitivity settings are provided by SWI 296, high, medium, and low. These settings include where the reference voltage is the voltage drop across XR6 298 (499 kSZ) with the remainder of the voltage divider equal to XR19 300 (453 kS2) plus XR16 302 (20 kS2) plus XR14 304 (10 kS2). This is the high setting, since the base reference voltage (Vpp=499/[499 483]) is greater than, but almost equal to the base signal value (Vpp=499/[499+499]). The signal must overcome, i. e., become smaller than the reference voltage (since the input is an inverting input) than the reference voltage, in order to swing the output 306 of the comparator XU2B 282 high and activate, say, a motor-control latch (not shown in Figure lOD). The medium sensitivity setting, in Figure 10E, of switch XSWI 296 (bypassing XR14, 304 10 Qk, by way of switch XSW1 296) widens the difference between the signal and reference levels. The low sensitivity setting (bypassing XR14 304, 10 92k, and XR16 302, 20 S2k, by way of switch XS W 1 296), widens that difference between the signal and reference levels even more. Consequently, a larger difference between the signal and the reference voltage must be overcome to activate the motor by way of the comparator XU2B 282 and the motor-control latch (not shown in Figure I OD).
The entire sensor circuit runs continuously on approximately 300 EtA at a supply voltage (XVDD 234) of 5 V.
Although the present invention and its advantages have been described in- detail, it should be understood that vaiious changes, substitutions. and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in tlie art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope_-such._ prQCcsses, _.mac.hine.sF.-.manufacture,.. _compositiqns of_.
matter, means, methods, or steps.
Figure 4C shows the locking mechanism where the locking bar closest to the rear of the casing is adapted to fit into a mating structure in the rear casing;
Figure 5 is a perspective, exploded view of the carousel assembly;
Figure 6A is a side elevation view of the paper feeding from the stub roll while the tail of the main roll is positioned beneath the transfer bar;
Figure 6B is a side elevation view of the stub roll is completely exhausted, so that the transfer bar tucks the tail of the main roll into the feed mechanism;
Figure 7A is a side elevation view of the carousel ready for loading when the main roll reaches a specific diameter;
Figure 7B is a side elevation view of the locking bar being pulled forwardly to allow the carousel to rotate 180 , placing the main roll in the previous stub roll position;
_. Figure 7C .shows .the extension spxings which tend to. maintain the transfer bar legs in contact with the stub roll;
Figure 7D shows the cleanable floor of the dispenser;
Figure 8A shows a schematic of the proximity circuit;
Figure 8B (prior art) shows the schematic for the National Semiconductor dual comparator LM393;
Figure 9A shows the square wave output at U1A, pin 1;
Figure 9B shows the RC exponential waveforms at pins 5;
Figure 9C shows the RC exponential waveforms at pin 6;
Figure 10 shows a schematic of a second proximity switch;
Figure l0A shows the asymmetric oscillator and the first static protection circuit;
Figure 10B shows the antenna, the antenna reset circuit, a second static protection circuit, the antenna buffer unity follower circuit; and the peak detector circuit; and a peak detector circuit;
Figure lOC shows the low pass filter for rejecting 50/60 Hz, the amplifier circuit, and.the test points for adjusting VRI to 3.0 V with all eternal capacitance-like loads in place;
Figure lOD shows the auto-compensate capacitor, the 50/60 Hz reject capacitor, and the output comparator which will produce an output pulse for signals which have passed all the rejection tests; these tests designed to prevent spurious signals from setting otf an output pulse; and Figure l0E shows a sensitivity select switch and circuit.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The following description is of the best mode presently contemplated for carrying out the invention. This description is not to be taken in a limiting sense, but is merely made for the purpose of describing the general principles of the invention. The scope of the invention should be determined with reference to the claims.
An embodiment of the invention comprises a carousel-based dispensing system with a transfer bar for paper towels, which acts to minimize actual wastage of paper towels. As an enhancement and further development of a system for delivering paper towel to the end user in a cost effective manner and in as user-friendly manner as possible, an automatic means for dispensing the paper towel is desirable, making it unnecessary for a user to physically touch a knob or a lever. An electronic proximity sensor is included as part of the paper towel dispenser.
A person can approach the paper towel dispenser, extend his or her hand, and have the proximity sensor detect the presence of the hand. The embodiment of the invention as shown here, is a system, which advantageously uses a minimal number of parts for both the mechanical structure and for the electronic unit. It has, .
therefore, an enhanced reliability and maintainability, both of which contribute to cost effectiveness.
An embodiment of the invention comprises a carousel-based dispensing system with a transfer bar for paper towels, which acts to minimize actual wastage of paper towels. The transfer bar coupled with the carousel system is easy to load by a service person; consequently it will tend to be used, allowing stub rolls to be fully utilized. In summary, the carousel assembly-transfer bar comprises two components, a carousel assembly and a transfer bar. The carousel rotates a used-up stub roll to an up position where it can easily be replaced with a full roll.
At the same time the former main roll which has been used up such that its diameter is less than some p inches, where p is a rational number, is rotated down into the stub roll position. The tail of the new main roll in the upper position is tucked under the "bar"
part of the transfer bar. As the stub roll is used up, the transfer bar moves down under spring loading until the tail ot'tlie main roll is engaged between the feed roller and the nib roller. The carousel assembly is symmetrical about a horizontal axis. A
locking bar is pulled out to unlock the carousel assembly and allow it to rotate about its axis, and is then released under its spring loading to again lock the carousel assembly in place.
A side view, Figure 1, of the dispenser 20 with the cover 22 in place shows an upper circular bulge 24, providing room for a full roll of paper towel, installed in the upper position of the carousel. The shape of the dispenser is such that the front cover tapers inwardly towards the hottom to provide a smaller dispenser volume at the bottom wllere there is a smaller stub roll of paper towel. The shape tends to minimize the overall size of the dispenser. Figure 2 shows a perspective view of the dispenser 20 with cover 22 in place and the circular (cylindrical) bulge 24, together with the sunrise-like setback 26 on the cover 22, which tends to visually guide a hand toward the pseudo-button 28, leading to activation of a proximity sensor (not shown). A light emitting diode (LED) 130 is located centrally to the pseudo-button 28. The LED 130 (Fig. 3) serves as an indication that the dispenser 20 is on, and dispensing towel. The LED 130 may be off while the dispenser is not dispensing.
Alternatively, the LED 130 may be lit (on), and when the dispenser 20 is operating, the LED 130 might flash. The LED 130 might show green when the dispenser 20 is ready to dispense, and flashing green, or orange, when the dispenser 20 is operating to dispense. Any similar combination may be used. The least power consumption occurs when the LED 130 only lights during a dispensing duty cycle. The sunrise-like setback 26 (Fig. 2) allows a hand to come more closely to the proximity sensor (not shown).
Fibure 3 shows the main elements of the carousel assembly 30.
The carousel arms 32 have friction reducing rotating paper towel roll hubs 34, which are disposed into the holes of a paper towel roll (66, 68, Fig. 4A). The locking bar 36 serves to lock and to release the carousel for rotation about its axis 38. The locking bar 36 rides on one of the corresponding bars 40. The two corresponding bars serve as support bars. Cross-members 42 serve as stiffeners for the carousel assembly 30. and also serve as paper guides for the paper to be drawn over and down to the feed roller 50 and out the dispenser 20. These cross members are attached in a rigid tasliion to the corresponding bars 40 and in this embodiment do not rotate.
The legs 46 of the transfer bar 44 do not rest against the friction reducing rotating paper towel roll hubs 34 when there is no stub roll 68 present but are disposed inward of the roll hubs 34. The bar part 88 of the transfer bar 44 will rest against a structure of the dispenser, for example, the top of modular electronics unit 132, when no stub roll 68 is present. The bar part 88 of the transfer bar 44 acts to bring the tail of a new main roll of paper towel 66 (Fig. 4A) down to the feed roller 50 which includes intermediate bosses 146 (Fig. 3) and shaft 144. The carousel assembly is disposed within the fixed casing 48. The cover is not shown.
Feed roller 50 serves to feed the paper towels 66, 68 (Fig. 4A) being dispensed onto the curved dispensing ribs 52. The curved dispensing ribs are curved and have a low area of contact with the paper towel dispensed (not shown).
If the dispenser 20 gets wet, the curved dispensing ribs 52 help in dispensing the paper towel to get dispensed by providing low friction and by holding the dispensing towel off of the wet surfaces it would otherwise contact.
The feed roller 50 is typically as wide as the paper roll, and includes drive rollers 142 and intermediate bosses 146 on the drive shaft 144.
The working drive rollers or drive bosses 142 (Fig. 3) are typically an inch or less. in width, with intermediate bosses 146 (Fig. 3) located between them:
Intermediate bosses 146 are slightly less in diameter than the drive rollers or drive bosses 142, having a diameter 0.0 15 to 0.045 inches less than the drive rollers or drive bosses 142.
In this embodiment, the diameter of the intermediate bosses 146 is 0.030 inches le.ss. ,, ..
than the drive roller 142. This configuration of drive rollers or drive bosses 142 and intermediate bosses 146 tends to prevent the dispensing paper towel from becoming wrinkled as is passes through the drive mechanism and reduces friction, requiring less power to operate the feed roller 50.
A control unit 54 operates a motor 56. Batteries 58 supply power to the motor 56. A motor 56 may be positioned next to the batteries 58. A
light 60, for example, a light-emitting. diode (LED), may be incorporated into a low battery warning such that the light 60 turns on when the battery voltage is lower than a predetermined leveL
The cover 22 of the dispenser is preferably transparent so that the amount of the main roll usecl (see below) may be inspected, but also so that the battery low light 60 may easily be seen. Otherwise an individual window on an opaque cover 22 would need to be provided to view the low battery light 60.
Another approaclt might be to lead out the liglit by way of a fiber optic light pipe to a transparent window in the cover 22.
In a waterproof version of the dispenser, a thin piece of foam rubber rope is disposed witliin a u-shaped groove of the tongue-in-groove mating surfaces of the cover 22 and the casing 48. . The dispensing shelf 62 is a modular component, which is removable from the dispenser 20. In the waterproof version of the dispenser 20, the dispensing shelf 62 with the molded turning ribs 52is removed.
By removing the modular component, dispensing shelf 62, there is less likelihood of water being diverted into the dispenser 20 by'the dispensing shelf 62, acting as a funnel or chute should a water hose or spray be directed at the dispenser 20, by the shelf and wetting the paper towel. The paper towel is dispensed straight downward.
A most likely need for a waterproof version of the dispenser is where a dispenser is located in an area. subject to being cleaned by being hosed down. The dispenser 20 has an on-off switch which goes to an off state when the cover 22 is pivoted ..___dowttwardl.y. The_actual_ switch is located on the lower face of the nodule 54 and is not shown.
In one embodiment, the user may actuate the dispensing of a paper towel by placing a hand in the dispenser's field of sensitivity. There can be adjustable delay lengths between activations of the sensor.
There is another aspect of the presence of water on or near the dispenser 20. A proximity sensor (not visible) is, more fully discussed below, including the details of its operation. However, as can be appreciated, the sensor detects changes of capacitance such as are caused by the introduction of an object with a high dielectric constant relative to air, such as water, as well as a hand which is about 70% water. An on-off switch 140 is provided which may be turned off before hosing down and may be turned on manually, afterwards. The switch 140 may also work such that it turns itself back on after a period of time, automatically.
The switch 140 may operate in both modes, according to mode(s) chosen by the user.
A separate "jog" off-on switch 64 is provided so that a maintenance person can thread the paper towel 66 by holding a spring loaded jog switch 64 which provides a temporary movement of the feed roller 50.
Figure 4A shows the dispenser case 48 with the carousel assembly 30 and transfer bar 44. The carousel assembly 30 is ftilly loaded witli a main roll 66 and a stub roll 68, both mountecl on the carousel arms 32 and rotate on the rotating reduced friction paper towel roll hubs 34 (only shown from the back of the carousel arms 32). In the carousel assembly 30, the two carousel arms 32, joined by corresponding bars 40 and cross members 42, rotate in carousel fashion about a horizontal axis defined by the carousel assembly rotation hubs 38. The locking bar 36 is supported, or carried, by a corresponding bar 40. The corresponding bar 40 provides structural rigidity and support. The locking bar 36 principally serves as a locking mechanism. Each paper towel roll 66, 68 has an inner cardboard tube which acts as a central winding core element, and which provides in a hole in paper towel roll 66, 68 at each end for engaging the hubs 34.
Figure 5 shows the carousel assembly 30 in exploded, perspective view. The number of parts comprising this assembly is small. From a reliability point of view, the reliability is increased. From a manufacturing point of view, the ease of manufacture is thereby increased and the cost of manufacture is reduced. The __.material _of manufacture is not, limited except as to the requirements of cost, ease of manufacture, reliability, strength and other requirements imposed by the maker, demand.
When the main roll, 66 (Fig. 4A) and the stub roll 68, (Fig. 4A) are in place, the carousel arms 32 are connected by these rolls 66 and 68 (Fig.
4A).
Placing cross-members 42 to connect the carousel arms 32 with the locking 36 and corresponding 40 bar results in better structural stability, with racking prevented. The locking bar 36, which was shown as a single unit locking bar 36 in the previous figures, acts as a locking bar 36 to lock the carousel assembly 30 in the proper orientatibn. It acts also as the release bar, which when released, allows the carousel assembly 30 to rotate. Two compression springs 70, 72 are utilized to center the locking bar 36.
Figure 4B is a side view of the locking bar showing the placement of the compression springs. The compression springs 70, 72 also tend to resist the release of the locking bar 36, insuring that a required force is needed to unlock the locking bar 36. The required force is typically between 0.5 lbf and 3Ø lbf, or more.
In this embodiment, the force is 2.0 lbf when the spring in a fully compressed position, and 1.1 lbf when the spring is in the rest position. In the rest position, the forces of the opposing springs offset each other.
The actual locking occurs as shown in Figure 4C. The locking bar 36 closest to the rear of the casing 48 is adapted to fit into a generally u-shaped mating structure 118 which is adapted to hold the locking bar 36 and prevent it and the carousel assembly 30 from rotating. When the locking bar 36 is pulled away from the rear of the casing 48, the locking bar 36 is disengaged from the mating structure 118. The mating structure has an upper "high" side 120 and a lower "low" side 122, where the low side has a "ramp" 124 on its lower side. As the locking bar 36 is pulled out to clear the high side 120, the carousel assembly 30 is free to rotate such that the top of the carousel assembly 30 rotates up and away from the back of the casing 48.
As the carousel assembly 30 begins to rotate, the user releases the locking bar 36 which, under the influence of symmetrically placed compression springs 70, 72 returns to its rest position. As he carousel assembly rotates, the end of the symmetrical locking bar 36 which originally was disposed toward the user now rotates and contacts the ramp 124. A locking bar spring, e.g., 70 or 72, is compressed as the end of the locking bar 36 contacting the ramp 124 now moves up the ramp 124.
The end of the locking bar 36 is pressed into the space between the low side 122 and the high side 120, as the end of the locking bar 36 slides past the low side 122. A
locked position for the carousel assembly 30 is now reestablished.
Figure 5 shows the carousel arms 32 adapted to receive the loading of a new roll of towel 66 (Fig. 4A). The arms 32 are slightly flexible and bent outward a small amount when inserting a paper towel roll 66 (Fig. 4A) between two opposite carousel arms 32. A friction reducing rotating paper towel roll hub 34 is inserted into a hole of a paper towel roll 66 (Fig. 4A), such that one roll hub 34 is inserted into a hole on each side of the paper towel roll 66 (Fig. 4A). Also shown in Figure 5 are the tamper resistant fasteners 74, which attach the friction-reducing rotating paper towel roll hubs 34 to the carousel arms 32.
Figure 5 shows the surface 76 of the roll hubs 34 and the surface 78 of the carousel arms 66, which contact each other. These contact surfaces 76, 78 may be made of a more frictionless material than that of which the carousel arms 32 and the roll hubs 34 are made. For example, a plastic such as polytetrafluoroethylene (PTFE), e.g., TEFLON OO , may be used, as a thin layer on each of the contacting surfaces. The paper towel dispenser 20 and its components may be made of, including but not limited to, plastic, metal, an organic material which may include but is not Iimited to wood, cardboard, treated or untreated, a combination of these materials, and other materials for batteries, paint, if any, and waterproofing.
Figure 6A sllows the paper 80 feeding from the stub roll 68 while the tail 82 of the main roll 66 is positioned beneath the transfer bar 44. The legs (visible leg 46, other leg not shown) of the transfer bar 44 rests against the stub roll.
When the diameter of the stub roll 68 is larger by a number of winds of paper towel than the inner roll 84, the legs 46 of the transfer bar 44 dispose the bar 88 of the transfer bar 44 to be rotated upward from the feed roller 50.
Figure 6B shows the situation where the stub roll 68 is exhausted, so that the transfer bar 44 tucks the tail 82 of the main ro1166 into the feed mechanism 86. Figure 6B shows the stub roll 68 position empty, as the stub roll has been used up. The stub roll core 84 is still in place, As the stub ro1168 is used up, the legs 46 of the transfer bar 44 move up toward the stub roll core (inner roll) 84, and the bar 88 of the transfer bar is disposed downward toward the feed roller 50 and toward the top of a structural unit o-t the dispenser 20 (Fig. 2), such as the top of the electronics module 132__(Fig._3). _Initially the main roll 66is in reserve, and its tail 82 in an "idling"
position such that it is under the transfer bar 44. The main roll 66 and its tail 82 are not initially in a "drive" position. However, as the stub roll 68 is used up, the downward motion of the bar transfer bar, 44 driven by its spring loading, brings the bar 88 of the transfer bar 44 down to engage the main roll tail 82 with the feed roller 50.
Figure 7A shows the carousel. assembly 30 ready for loading when the main roll 66 reaches a specific diameter. The diameter of the main roll 66 may be measured by comparison of that diameter with the widened "ear" shape 122 (Fig.
4A) on each end of the carousel arms 32. That part of each carousel arm 32 is made to measure a critical diameter of a main roll 66. The carousel assembly 30 is tilted forward when it is locked. The carousel assembly 30 may rotate unassisted after the locking bar 36 is released, due to the top-heavy nature of the top roll. That is, the torque produced by the gravitational pull on the main-ro1166 is larger than that needed to overcome friction and the counter-torque produced by the now empty stub roll 68.
Figure 7B shows the process of loading where the service person pulls the locking bar 3.6 and allows the carousel to rotate 180 , placing the main roll 66 in the previous stub roll 68 position. Now a new full sized roll 66 can be loaded onto the main roll 66 position. The transfer bar 44 automatically resets itself. The transfer bar 44 is spring loaded so as to be disposed with the transfer bar legs 46 pressed upward against the stub roll 68 or the stub roll core 84. The transfer bar legs 46 are adapted to be disposed inward of the roll hubs 34 so the bar 88 of the transfer bar 44 will have a positive stop at a more rigid location, in this case, the top of the electronics module 132 (Fig. 2).
Figure 7C shows the extension springs 126, 128 which tend to maintain the transfer bar legs 46 in contact with the stub roll 68 or stub roll core 84.
The transfer bar 44 contains the two extension springs 126, 128. The spring forces are typically 0.05 lbf to 0.5 lbf in the bar 44 lowered position and 0.21bf to 1.0 lbf in the bar 44 raised position. In this embodiment, the spring forces are 0.2 lbf in the lowered position an 0.43 lbf in the raised position. The force of the two springs 126, 128 is additive so that the transfer bar 44 is subject to a total spring force of 0.4 lbf in the lowered position and 0.86 lbf in the raised position.
While modular units (Fig. 7D) such as the electronics module 132, the motor 56 module, and the battery case 150, are removable, they fit, or "snap"
together so that the top of the electronics unit 132, the top of the motor 56 module and remaining elements of the "floor" 148 of the dispensing unit 20 form a smooth, cleanable surface: Paper dust and debris tend to accumulate on the floor 148 of the dispenser 20. It is important that the dispenser 20 is able to be easily cleaned as part of the maintenance procedure. A quick wiping with a damp cloth will sweep out and pick up any undesirable accumulation. The removable modular dispensing shelf may be removed for rinsing or wiping.
The feed roller 50 may be driven by a motor 56 which in turn may be driven by a battery or batteries 58, driven off a 100 or 220V AC hookup, or driven off a transformer which is run off an AC circuit. The batteries may be non-rechargeable or rechargeable. Rechargeable batteries *may include, but not be limited to, lithium ion, metal hydride, metal-air, nonmetal-air. The rechargeable batteries may be recharged by, but not liniited to, AC electromagnetic induction or light energy using photocells.
A feed roller 50 serves to feed the paper towel being dispensed onto the curved dispensing ribs 52. A gear train (not visible) may be placed under housing 86, (Fig. 3) for driving the feed roller. A control unit 54 (Fig. 3) for a motor 56 (Fig. 3) may be utilized. A proximity sensor (not shown) or a hand-operated switch 64 may serve to turn the motor 56 on and off.
As an enhancement and further development of a system for delivering paper towel to the end user in as cost effective manner and user-friendly manner as possible, an automatic means for dispensing the paper towel is desirable, making it unnecessary for a user to physically touch a knob or a lever.
Therefore, a more hygienic dispenser is present. This dispenser will contribute to less transfer of matter, whether dirt or bacteria, from one user to the next. The results of washing ones hands will tend to be preserved and hygiene increased.
An electronic proximity sensor is included as part of the paper towel dispenser. A person can approach the paper towel dispenser, extend his or her hand, and have the proximity sensor detect the presence of the hand. Upon detection of the hand, a motor is energized which dispenses the paper towel. It has long been known that the insertion of an object with a dielectric constant into a volume with an electromagnetic field will tend to modify the properties, -which the electromagnetic field sees. The property of the hand, a dielectric constant close to that of water, is enough_to_ alter the net capacitance of a suitable detector circuit.
An embodiment of the invention comprises a balanced bridge circuit. See Figure 8A. The component UIA 90 is a comparator (TLC3702 158) configured as an oscillator. The frequency of oscillation of this component, U1A 90, of the circuit may be considered arbitrary and non-critical, as far as the operation of the circuit is concerned. The period of the oscillator is set by the elements Cref 92, Rhys 94, the trim resistance, Rtrim 96, where the trim resistance may be varied and the range resistors Rrange 152 are fixed. The resistors Rrange 152 allow limits to be placed on the range of adjustment, resulting in an easier adjustment. The adjustment band is narrowed, since only part of the total resistance there can be varied.
Consequently a single potentiometer may be used, simplifying the adjustment of Rtrim 96. A value for Rrange 152 for the schematic shown in Figure 8A might be 100 kS2. Rtrim 96 might have an adjustment range of 10 kSa to 50.kS2. The output signal at pin 1 98 of component U1A 90 is a square wave, as shown in Figure 9A.
Cref 92 is charged by the output along with ANT 100, both sustaining the oscillation and measuring the capacitance of the adjacent free space. The signals resulting from the charging action are applied to a second comparator, U 1 B 102, at pin 5 104 and pin 6 106 (Fig. 8A). These signals appear as exponential waveforms, as shown in Figure 9B and Figure 9C.
The simplest form of a comparator is a high-gain differential amplifier, made either with transistors or with an op-amp. The op-amp goes into positive or negative saturation according to the difference of the input voltages because the voltage gain is typically larger than 100,000, the inputs will have to be equal to within a fraction of a millivolt in order for the output not to be completely saturated. Although an ordinary op-amp can be used as comparator, there are special integrated circuits intended for this use. These include the LM 306, LM311, 154 (Fig. 8A), LM393V, NE627 and TLC3702 158. The LM393V is a lower voltage derivative of the LM393 154. The LM393 154 is an integrated circuit containing two comparators. The TLC3702 158 is a micropower dual comparitor with CMOS push-pull 156 outputs. Figure 8B (prior art) is a schematic which shows the different output structures for the LM393 and the TLC3702. The dedicated comparators are much faster than the ordinary op-amps.
The output signal at pin 1 98 of component U1A 90, e.g., a TL3702 158, is a square wave, as shown in Figure 2A. Two waveforms are generated at the inputs of the second comparator, U2B 102. The first comparator 90 is running as an oscillator producing a square-wave clocking signal, which is input, to the clock input of the flip-flop U2A 108, which may be, for example, a Motorola D flip-flop, No.
14013.
Running the first comparator as a Schmitt trigger oscillator, the first comparator U1A 90 is setup to have positive feedback to the non-inverting input, terminal 3 110. The positive feedback insures a rapid output transition, regardless of the speed of the input waveform. Rhys 94 is chosen to produce the required hysteresis, together with the bias resistors Rbiasl 112 and Rbias2 114. When these two bias resistors, Rbias 1 112, Rbias2 114 and the hysteresis resistor, Rhys 94, are equal, the resulting threshold levels are 1/3 V+ and 2/3 V+, where V+ 158 is the supply voltage. The actual values are not especially critical, except that the three resistors Rbias 1 112, Rbias2 114 and Rhys 94, should be equal, for proper balance.
The value of 294 kSZ maybe used for these three resistors, in the schematic shown in Figure 8A.
An external pullup resistor, Rpullup l 116, which may have a value, for example, of 47052, is only necessary if an open collector , comparator such as an LM393 154 is used. That comparator 154 acts as an open-collector output with a ground-coupled einitter. For low power consumption, better performance is achieved with a CMOS comparator, e.g., TLC3702, which utilizes a cmos push-pull output 156. The signal at terminal 3 110 of U1A charges a capacitor. Cref 92 and also charges an ANT sensor 100 with a capacitance which Cref 92 is designed to approximate. A value for Cref for the schematic of Figure 8A, for the most current board design, upon which it depends, is about 10 pF. As the clocking square wave is effectively integrated by Cref 92 and the capacitance of ANT 100, two exponential signals appear at terminals 5 104 and 6 106 of the second comparator U1B, through the Rprotect 160 static protection resistors. Rprotect 160 resistors provide limiting resistance which enhances the inherent static protection of a comparitor input lines, particularly for the case of pin 5 104 of U 1 B 102. In the schematic shown in Figure 8A, a typical value for Rprotect 160 might be 2 W. One of the two exponential waveforms will be greater, depending upon the settings of the adjustable resistance Rtrim_-96,_.Cref_92,_.._and..ANT 100. .The comparator U1B 102 resolves small differences, reporting logic levels at its output, pin7 118. As the waveforms may initially be set up, based on a capacitance at ANT 100 of a given amount.
However, upon the intrusion of a hand, for example, into the detection field of the antenna ANT
100, the capacitance of ANT 100 is increased significantly and the prior relationship of the waveforms, which were set with ANT 100 with a lower capacitance, are switched over. Therefore, the logic level output at pin 7 118 is changed and the d flip-flop 108 state is changed via the input on pin 5 of the D flip-flop 108.
The second comparator 102 provides a digital quality signal to the D flip-flop 108. The D flip-flop, U2A 108, latches and holds the output of the comparator UIB 90. In this manner, the second comparator is really doing analog-to-digital conversion. A suitable D flip-flop is a Motorola 14013.
The presence, and then the absence, of a hand can be used to start a motorized mechanism on a paper towel dispenser, for example: An embodiment of the proximity detector uses a single wire or a combination of wire and copper foil tape that is shaped to form a detection field. This system is very tolerant of non-conductive items, such as paper towels, placed in the field. A hand is conductive and attached to a much larger conductor to free space. Bringing a liand near the antenna serves to increase the antenna's apparent capacitance to free space, forcing detection.
The shape and placement of the proximity detector's antenna (Fig.
8A, 100) huns out to be of some importance in making the proximity sensor work correctly. Experimentation showed that a suitable location was toward the lower front of the dispenser unit. The antenna (Fig. 8A, 100) was run about two-thirds the length of the dispensing unit, in a modular, replaceable unit above the removable dispensing shelf 62 (Fig. 3). This modular unit would be denoted on Figure 3 as 120.
A detection by the proximity detection circuit (Fig: 8AY in the module 120 sets up a motor control flip flop so that the removal of the hand will trigger the start of the motor cycle. The end of the cycle is detected by means of a limit switch which, when closed, causes a reset of the flip-flop and stops the motor. A
cycle may also be initiated by closing a manual switch.
A wide range of sensitivity can be obtained by varying the geometry of the antenna and coordinating the reference capacitor. Small antennae have short ranges. suitable for non-contact pushbuttons. A large antenna could be disposed as a doorway-sized people detector. .Another factor in sensitivity is the element applied as Rtrim. If Rtrim 96 is replaced by an adjustable inductor, the exponential signals become resonant signals with phase characteristics very strongly influenced by capacitive changes. Accordingly, trimming with inductors may be used to increase range and sensitivity. Finally, circuitry may be added to the antenna 100 to improve range and directionality. As a class, these circuits are termed "guards" or "guarding electrodes," old in the art, a type of shield driven at equal potential to the antenna. Equal putential insures no charge exchange, effectively blinding the guarded area of the antenna rendering it directional.
The antenna design and trimming arrangement for the paper towel dispenser application is chosen for adequate range and minimum cost. The advantages of using a guarded antenna and an adjustable inductor are that the sensing unit to be made smaller.
From a safety standpoint, the circuit is designed so that a detection will hold the motor control flip-flop in reset, thereby stopping the mechanism. The cycle can then begin again after detection ends.
The . dispenser has additional switches on the control module 54.
Figure 3 shows a "length-of-towel-to-dispense-at-one-time" (`length")switch 134.
This switch 134, is important in controlling how long a length of paper towel is dispensed, for each dispensation of towel. It is an important setting for the owner of the dispenser on a day-to-day basis in determining cost (to the owner) versus the comfort (to the user) of getting a large piece of paper towel at one time.
A somewhat similar second switch 136 is "time-delay-before-can-activate-the-dispensing-of another-paper-towel" ("time-delay") switch 136. The longer the time delay is set, the less likely a user will wait for many multiple towels to dispense. This tends to save costs to the owner. Shortening the delay tends to be more comfortable to a user.
A third switch 138 is the sensitivity setting for the detection circuit.
This sensitivity setting varies the resistance of Rtrim 96 (Fig. 8A). Once an effective antenna 100 (Fig. 8A) configuration is set up, the distance from the dispenser may be varied. Typical actual use may require a sensitivity out to one or two inches, rather than four or six inches. This is to avoid unwanted dispensing of paper towel.
In a hospital setting, or physician's office, the sensitivity setting might be made fairly low so as to avoid unwanted paper towel dispensing. At a particular work location, on the other hand, the sensitivity might be set _fairly high, so that paper towel will be dispensed very easily.
While it is well known in the art how to make these switches according to the desired fiinctionalities, this switch triad may increase the usefulness of the embodiment of this invention. The system, as shown in the embodiment herein, has properties of lowering costs, improving hygiene, improving ease of operation and ease of maintenance. This embodiment of the invention is designed to consume low power, compatible with a battery or battery pack opeXation. In this embodiment, a 6 volt DC supply is utilized. A battery eliminator may be use for continuous operation in a fixed location. There is a passive battery supply monitor that will turn on an LED indicator if the input voltage falls below a specified voltage.
A second embodiment of this invention comprises a second electronic proximity sensor. The second detector circuit is a miniaturized, micro-powered, capacitance-based proximity sensor designed to detect the approach of a hand to a towel dispenser. It features stable operation and a three-position sensitivity selector.
Figure 10 shows the whole proximity detector circuit. In order to examine the circuit more carefully, Figure 10 is broken out into sections 10A
through 10E. These component circuits are shown separately as Figures l0A through 10E, corresponding to the breakout sliown in Figure 10.
At the heart of the proximity detector is an adjustable asymmetric rectangular wave oscillator running in a range of 24 kHz to 40kHz, as shown in Figure IOA. Once an initial adjustment has been set it is not readjusted during operation, normally. The asymmetrical feature of having a longer on-time and shorter off-time allows for more useable signal, i.e., on-time. This 24 kHz to 40kHz oscillation range provides a basis for a high rate of sampling of the environment to detect capacitance changes, as detailed below. As shown, a fast comparator, 200, has positive feedback through XR18 202 from the output terminal 1 204 (XU2A) to the positive input terminal 3 206 (XU2A). The comparator operates as a Schmitt trigger oscillator with positive feedback to the non-inverting input, terminal. The positive feedback insures a rapid output transition, regardless of the speed of the input waveform. As the capacitor XC6 208 is charged up, the terminal 3 206 of the 200 comparator reaches 2/3 XVDD. This voltage 2/3 XVDD is maintained on terminal 3 206 by the voltage dividing network XR17 212 and XR20 214, and the positive feedback resistor XR18 202 thatis in parallel with XR17 212, where XR17 212 and XR20 214 and XR18 202 are all equal resistances. The simplest form of a comparator is a high-gain differential aniplifier, made either with transistors or with an op-amp.
The op-amp goes into positive or negative saturation according to the difference of the input voltages because the voltage gain is typically larger than 100,000, the inputs will have to be equal to within a fraction of a millivolt in order for the output not to be completely saturated. Although an ordinary op-amp can be used as comparator, there are special integrateci circuits intended for this use. For low power consumption, better performance is achieved with a CMOS comparator, such as a TEXAS
1NSTRUMENT T'LC3702CD 158 (Figure 8B). The TLC 3702 158 is a micropower dual coniparator with CMOS push-pull 156.(Figure. 8B) outputs.
These dedicated comparators are niuch faster than the ordinary op-amps.
As the transition occurs, the output, at the output terminal 1 204, goes relatively negative, XD5 216 is then in a forward conducting state, and the capacitor XC6 208 is preferentially discharged through the resistance XR15 218 (100kS2) and the diode XD5 216.
The time constant for charging the capacitor XC6 206 is determined by resistors XVRI 220, XR13 222 and XR15 218. The resistor XR15 218 and the diode XD5 216 determine the time constant for discharge of the capacitor XC6 208.
The reset tinie is fixed at 9 s by XD5 216 and XR15 218. The rectangular wave source supplying the exponential to the antenna, however, can be varied from 16 to 32 s, utilizing the variable resistance XVRI 220 and the resistors XR13 222 and XR15 218. Once set up for operational the variable resistance is not changed. The asymmetric oscillator can produce more signal (16 s to 32 s, as compared to the reset time. The reset time is not especially important, but the reset level is both crucial and consistent: The exponential waveform always begins one "diode voltage drop" (vbe) above the negative rail due 'to the forward biased diode voltage drop of XD2 224 (Figure l OB). One "diode.voltage drop" (vbe) is typically in the range 0.5 V to 0.8 V, or typically about 0.6 V.
The dual diode XD4 226 (Figure 10A) provides protection from static electricity. Terminal 1 228 of XD4 226 will conduct when terminal 3 230 is at least one diode voltage drop below the ground, or negative rail. Terminal 2 232 will conduct when terminal 3 230 is at least one diode voltage drop above VDD 234.
Therefore, the signal level at terminal 3 230 is limited to the range -vbe to VDD +
vbe, thereby eliminating voltage spikes characteristic of "static", which may be induced by lightening or the operation of electrical motors, for example. The static is primarily built up by the internal mechanisms of the towel dispenser and the movement of the paper and is discharged by bringing a waving hand near the sensor.
The asymmetric square wave charges the antenna 236 (Figure l OB) through the resistors XR9 238 and XR4 240. The sum resistance, XR, is equal to XR9 238 plus XR4 240, or 1.7 MS2, for the example values shown in_Figures 10 and IOB. The antenna 236 forms one conducting side of a capacitor, while the atmosphere and other materials form a dielectric between the antenna as one conducting element and other conductive materials including buildings and the actual earth as a second conductive element. The capacitance C of the antenna 236 relative to "free space" is approximately 7 pF to 8 pF, as determined by experiment, yielding a time constant T, where i is equal to RC. Thus, the time constant, for the exemplary values, is about 13 ELs.
If a hand of a person is placed in proximity to the antenna of the circuit, the capacitance of the antenna to free space may double to about 15 pF with a resultant longer time constant and lower amplitude exponential waveform. The time constant i is increased to about 26 s. While it is possible to directly compare the signals, it is also desirable to have as stable an operating circuit as possible while retaining a high sensitivity and minimizinb false positives and false negatives with respect to detection. To aid in achieving these goals, the signal is conditioned or processed first.
-Looking at the operational amplifier XU 1 A 242, the (signal) waveform sees very high impedance, since operational amplifiers have high input impedance. The impedance on the antenna 236 side of the operational amplifier 242, in the form of resistance, is about 1.9 M. The impedance on the other side of the operational amplifier is of the order of 5 kS2. In order to provide an impedance buffer the signal the operational amplifier UX1A 242 is set up as a unity follower with a voltage gain of 1.0, that is, the gain given by VoõtNiõ equals one. The unity follower has an input-side (of the operational amplifier) resistance of about 1.0 Tfl (1013 S2).
The (operational amplifier's) output impedance is in a range about 40 to 600 to several thousand ohms. Consequently, this unity follower configuration serves to isolate or buffer the upstream high-impedance circuit from the downstream low --impedance-circuit.
The resistor XR2 244 acts as a current limiter, since the current i is equal to v/XR2 at XR2 244. Further protection against static is provided by the diode pair XD3 246 in the same way as diode pair XD4 226 (Figure l0A). Terminal 1 of XD3 246 will conduct when terminal 3 250 is at least one diode voltage drop below the ground, or negative rail. Terminal 2 252 will conduct when terminal 3 250 is at least one diode voltage drop above VDD. Therefore, the signal level at terminal 3 250 is limited to the range -vbe to VDD + vbe, so that voltage spikes characteristic of "static" are eliminated.
Asymmetric oscillator pulses, after detecting capacitance which either includes or does not include a proximate dielectric equivalent to that of a proximate hand, act on the positive (non-inverting) input terminal 254 of the unity follower operational amplifier 242 to produce a linear output at its output terminal 256. The state of the output terminal is determined by first, the length of the asymmetric on pulse, and within the time of the "on" pulse, the time taken to charge up the antenna 236 (as capacitor) and the time to discharge through XR2 244 to the non-inverting input terminal 254. The time-constant-to-charge is 13 s to 26 s. The time-constant-to-discharge is 0.8 to 1.6 fLs. To cliarge the antenna 236 to a certain charge, Q, for a capacitance based on a dielectric constant for "free space"
of eo, i.e., CEO, a voltage of V = Q/CE,,.is required. For the case of a capacitance, i.e., CEp.,E, which includes a detectable hand in "free space," the voltage required to store charge Q is Q/CEprE. However, CE,,,E is about twice CE,,, so that the voltage peak for the detected hand is about half.of the no-hand-present case.
The diode XD 1 258 allows positive forward conduction but cuts off the negative backward conduction of a varying signal pulse. The forward current, or positive peak of the current, tends to charge the capacitor XC5 260. The diode XDI 258, the resistor XR8 262, the capacitor XC5 260 and the bleed resistor 264 comprise a peak detector network. .. XD 1 258 and XC5 260 capture the positive peak of the exponential waveform. XR8 262 prevents oscillation of XU 1 A 242.
262 limits the charging time constant to 5 ms, where XR8 262 is 4.99 kf2 and 260 is 0.1 F. This has an averaging effect on the peak detection and prevents noise spikes from pumping up the detector. The resistor XR10 264 discharges the-detector at a half-second time constant.
When-the. hand is detected, the stored charge on XC8 260 is such that the voltage is sufficient to raise the input to the non-inverting terminal 266 of operational amplifier XU 1 B 268 above %aXVDp, so as to drive that operational amplifier output to a usable linear voltage range.
The combination of the resistor XR1 270 (e.g., 499 kfl) and the capacitor XC1 272 (e.g., 0.1 F) comprise a low pass filter with a corner frequency of 1/XR1=XC1 (e.g., 20Hz), which corresponds to a time constant of XR1=XC1 (e.g., ms). This filter is for rejection of large 50Hz or 60Hz noise. These "high"
frequencies are effectively shorted to ground. It is particularly helpful when the towel dispenser proximity detector is powered from an AC-coupled supply. The ubiquitousness of the AC power frequency, however, makes this protection desirable, regardless.
The signal is next amplified by an operational amplifier XU1B
268, which has a gain of 22. The resistor XR5 277 serves as a feedback resistor to the negative (inverting) input terminal 279 of the operational amplifier 268.
There is a'/~
XVDD offset provided by the voltage divider network of XR3 274 and XR11 276.
The output rests against the negative rail until a peak exceeds V2 XVDD. The charge time adjustment XVRI becomes a very simple and sensitive way to adjust to this threshold. A setting of 3 V between test points XTP 1 278 and XTP2 280 is recominended. This adjustment is made with all external capacitive loads (i.e., plastic and metal components) in place.
The output comparator 282 (Figure l OD) is connected to the signal processing from the operational amplifier 268 (Figure lOC) by the auto-compensate capacitor XC3 284 (Figure lOD). This makes the circuit insensitive to DC
levels of signal, but sensitive to transients, e.g., a waving hand. As long as the charge-time adjustment function remains in a linear range, the sensitivity to a moving hand will be stable.
The capacitor XC4 286 allows the reference level (REF) 288 to track with approximately 50Hz or 60Hz noise on the SIGNAL 290 and not cause erroneous output pulses, since the AC noise will also track on the REF 288 (non-inverting) input to the comparator 282.
The output stage of the proximity detector is implemented as a variable threshold comparator, XU2B 282. The signal is set up with an offset voltage,.
where the resistors XR7 292 and XR12 294 are equal and divide the VDD voltage into two %2 VDD segments. Three sensitivity settings are provided by SWI 296, high, medium, and low. These settings include where the reference voltage is the voltage drop across XR6 298 (499 kSZ) with the remainder of the voltage divider equal to XR19 300 (453 kS2) plus XR16 302 (20 kS2) plus XR14 304 (10 kS2). This is the high setting, since the base reference voltage (Vpp=499/[499 483]) is greater than, but almost equal to the base signal value (Vpp=499/[499+499]). The signal must overcome, i. e., become smaller than the reference voltage (since the input is an inverting input) than the reference voltage, in order to swing the output 306 of the comparator XU2B 282 high and activate, say, a motor-control latch (not shown in Figure lOD). The medium sensitivity setting, in Figure 10E, of switch XSWI 296 (bypassing XR14, 304 10 Qk, by way of switch XSW1 296) widens the difference between the signal and reference levels. The low sensitivity setting (bypassing XR14 304, 10 92k, and XR16 302, 20 S2k, by way of switch XS W 1 296), widens that difference between the signal and reference levels even more. Consequently, a larger difference between the signal and the reference voltage must be overcome to activate the motor by way of the comparator XU2B 282 and the motor-control latch (not shown in Figure I OD).
The entire sensor circuit runs continuously on approximately 300 EtA at a supply voltage (XVDD 234) of 5 V.
Although the present invention and its advantages have been described in- detail, it should be understood that vaiious changes, substitutions. and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in tlie art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope_-such._ prQCcsses, _.mac.hine.sF.-.manufacture,.. _compositiqns of_.
matter, means, methods, or steps.
Claims (10)
1. A proximity detection circuit comprising:
an asymmetric oscillator circuit having its on-period set by a resistor network comprising a plurality of fixed resistors and at least one variable resistor and having its off-period set by at least one fixed resistor and by at least one first single diode;
a first static protection circuit comprising a first plurality of diodes, one said diode adapted to conduct away from ground, another said diode adapted to conduct toward the supply voltage;
a reset path wherein a second single diode provides a discharge path for an antenna wherein said antenna is discharged to the same voltage for every time period;
the asymmetric oscillator being adapted to send an approximately uniform amount of charge during its on-period to said antenna;
the antenna voltage being decreased when the capacitance of the antenna is increased by a detected object;
a second static protection circuit comprising a second plurality of diodes, one said diode adapted to conduct away from ground, another said diode adapted to conduct toward the supply voltage;
an antenna impedance buffer comprising operational amplifier operated as a unity gain follower with the output terminal of said operational amplifier being fed back to the inverting input terminal;
a voltage peak detector comprising a third single diode, a current limiting resistor, a peak storage capacitor and a bleed off resistor, said third single diode and said peak storage capacitor being adapted to capture the positive peak of exponential waveforms, said current limiting resistor being adapted to limiting current flow and to providing said antenna impedance buffer output with more phase margin to prevent oscillation, said bleed-off resistor adapted to providing a discharge pathway for said peak storage capacitor;
an amplifier with gain and voltage offset;
an auto-compensation capacitor adapted to filter out changes in DC voltage levels of signals while allowing transient signals to pass through;
a three-position switch adapted to provide three levels of detection sensitivity; and an output comparator adapted to generate an output on signal when the signal voltage, applied to the non-inverting input terminal of said comparator, is greater than the reference voltage, which is applied to the inverting input terminal of said comparator.
an asymmetric oscillator circuit having its on-period set by a resistor network comprising a plurality of fixed resistors and at least one variable resistor and having its off-period set by at least one fixed resistor and by at least one first single diode;
a first static protection circuit comprising a first plurality of diodes, one said diode adapted to conduct away from ground, another said diode adapted to conduct toward the supply voltage;
a reset path wherein a second single diode provides a discharge path for an antenna wherein said antenna is discharged to the same voltage for every time period;
the asymmetric oscillator being adapted to send an approximately uniform amount of charge during its on-period to said antenna;
the antenna voltage being decreased when the capacitance of the antenna is increased by a detected object;
a second static protection circuit comprising a second plurality of diodes, one said diode adapted to conduct away from ground, another said diode adapted to conduct toward the supply voltage;
an antenna impedance buffer comprising operational amplifier operated as a unity gain follower with the output terminal of said operational amplifier being fed back to the inverting input terminal;
a voltage peak detector comprising a third single diode, a current limiting resistor, a peak storage capacitor and a bleed off resistor, said third single diode and said peak storage capacitor being adapted to capture the positive peak of exponential waveforms, said current limiting resistor being adapted to limiting current flow and to providing said antenna impedance buffer output with more phase margin to prevent oscillation, said bleed-off resistor adapted to providing a discharge pathway for said peak storage capacitor;
an amplifier with gain and voltage offset;
an auto-compensation capacitor adapted to filter out changes in DC voltage levels of signals while allowing transient signals to pass through;
a three-position switch adapted to provide three levels of detection sensitivity; and an output comparator adapted to generate an output on signal when the signal voltage, applied to the non-inverting input terminal of said comparator, is greater than the reference voltage, which is applied to the inverting input terminal of said comparator.
2. The circuit as in claim 1 wherein said detected object comprises a material with a dielectric constant at least equal to one-half the dielectric constant of water.
3. The circuit as in claim 1 wherein said transient signal is generated by a moving hand.
4. The circuit as in claim 1 further comprising:
a motor activation switch connected to receive an output of a flip-flop activated by said output signal of said output comparator.
a motor activation switch connected to receive an output of a flip-flop activated by said output signal of said output comparator.
5. A proximity detection circuit comprising:
an oscillator circuit comprising a first comparator adapted to provide an asymmetric signal as input to an antenna sensor;
an antenna sensor adapted to respond to a change in dielectric constant in said sensor's proximity;
a first operational amplifier adapted to buffer said antenna sensor to a peak detector wherein said antenna sensor has high impedance and said peak detector has low impedance;
a second operational amplifier adapted to provide voltage offset to an input signal to said second operational amplifier and to amplify a signal from said peak detector as output from said second operational amplifier;
a second comparator adapted to produce an output pulse wherein said output signal from said second operational amplifier is an input signal to said second comparator and is of sufficient duration, amplitude and speed of change to produce said output pulse.
an oscillator circuit comprising a first comparator adapted to provide an asymmetric signal as input to an antenna sensor;
an antenna sensor adapted to respond to a change in dielectric constant in said sensor's proximity;
a first operational amplifier adapted to buffer said antenna sensor to a peak detector wherein said antenna sensor has high impedance and said peak detector has low impedance;
a second operational amplifier adapted to provide voltage offset to an input signal to said second operational amplifier and to amplify a signal from said peak detector as output from said second operational amplifier;
a second comparator adapted to produce an output pulse wherein said output signal from said second operational amplifier is an input signal to said second comparator and is of sufficient duration, amplitude and speed of change to produce said output pulse.
6. A method for detecting small capacitance changes comprising the steps of:
detecting time of charge integration for an antenna detector with a larger dielectric constant; and integrating a peak voltage proportional to said charge integration time wherein said charge integration time is inversely proportional to a resistance-capacitance time constant;
producing an output signal from a peak voltage pulse integration;
said output signal being adapted to activate a motor-controlling logic circuit.
detecting time of charge integration for an antenna detector with a larger dielectric constant; and integrating a peak voltage proportional to said charge integration time wherein said charge integration time is inversely proportional to a resistance-capacitance time constant;
producing an output signal from a peak voltage pulse integration;
said output signal being adapted to activate a motor-controlling logic circuit.
7. The method as in claim 6 further comprising the step of:
activating a motor switch when detecting a change in the output state of a flip-flop circuit.
activating a motor switch when detecting a change in the output state of a flip-flop circuit.
8. A method for detecting small capacitance changes, utilizing a proximity detection circuit, comprising the steps of:
producing an asymmetric oscillator circuit having its on-period set by a resistor network comprising a plurality of fixed resistors and at least one variable resistor and having its off-period set by at least one fixed resistor and by at least one first single diode;
providing protection from static utilizing a first static protection circuit comprising a first plurality of diodes, one said diode adapted to conduct away from ground, another said diode adapted to conduct toward the supply voltage;
resetting an antenna sensor voltage to a fixed amount utilizing a reset path wherein a second single diode provides a discharge path for an antenna wherein said antenna is discharged to the same voltage for every time period;
charging up an antenna with an antenna voltage wherein an approximately uniform amount of charge is sent by the asymmetric oscillator during its on-period to said antenna;
having said voltage lower when the capacitance of the antenna is increased by a detected object with a relatively high dielectric constant;
protecting against static in the proximity detector by utilizing a second static protection circuit comprising a second plurality of diodes, one said diode adapted to conduct away from ground, another said diode adapted to conduct toward the supply voltage;
impedance buffering with an antenna impedance buffer wherein said buffer comprises a unity gain operational amplifier with the output terminal of said operational amplifier being fed back to the inverting input terminal;
detecting a peak voltage utilizing a detector which comprises a third single diode, a current-limiting resistor, a peak storage capacitor and a bleed off resistor;
capturing the positive peak of exponential waveforms utilizing said third single diode and said peak storage capacitor to capture the positive peak of the exponential waveforms;
limiting current flow utilizing said current limiting resistor to limit current;
preventing oscillation by providing said antenna impedance buffer output with more phase margin, by utilizing resistance of said current limiting resistor;
providing a discharge pathway for said peak storage capacitor utilizing a bleed resistor;
providing voltage offset;
amplifying signal with an operational amplifier;
filtering out changes in DC voltage levels of signals while allowing transient signals, as generated by a waving hand, to pass through;
providing three levels of detection sensitivity utilizing a three-position switch;
generating an output on signal, utilizing an output comparator, when the signal voltage, applied to the inverting input terminal of said comparator, is less than the reference voltage, which said reference voltage is applied to the inverting input terminal of said comparator.
producing an asymmetric oscillator circuit having its on-period set by a resistor network comprising a plurality of fixed resistors and at least one variable resistor and having its off-period set by at least one fixed resistor and by at least one first single diode;
providing protection from static utilizing a first static protection circuit comprising a first plurality of diodes, one said diode adapted to conduct away from ground, another said diode adapted to conduct toward the supply voltage;
resetting an antenna sensor voltage to a fixed amount utilizing a reset path wherein a second single diode provides a discharge path for an antenna wherein said antenna is discharged to the same voltage for every time period;
charging up an antenna with an antenna voltage wherein an approximately uniform amount of charge is sent by the asymmetric oscillator during its on-period to said antenna;
having said voltage lower when the capacitance of the antenna is increased by a detected object with a relatively high dielectric constant;
protecting against static in the proximity detector by utilizing a second static protection circuit comprising a second plurality of diodes, one said diode adapted to conduct away from ground, another said diode adapted to conduct toward the supply voltage;
impedance buffering with an antenna impedance buffer wherein said buffer comprises a unity gain operational amplifier with the output terminal of said operational amplifier being fed back to the inverting input terminal;
detecting a peak voltage utilizing a detector which comprises a third single diode, a current-limiting resistor, a peak storage capacitor and a bleed off resistor;
capturing the positive peak of exponential waveforms utilizing said third single diode and said peak storage capacitor to capture the positive peak of the exponential waveforms;
limiting current flow utilizing said current limiting resistor to limit current;
preventing oscillation by providing said antenna impedance buffer output with more phase margin, by utilizing resistance of said current limiting resistor;
providing a discharge pathway for said peak storage capacitor utilizing a bleed resistor;
providing voltage offset;
amplifying signal with an operational amplifier;
filtering out changes in DC voltage levels of signals while allowing transient signals, as generated by a waving hand, to pass through;
providing three levels of detection sensitivity utilizing a three-position switch;
generating an output on signal, utilizing an output comparator, when the signal voltage, applied to the inverting input terminal of said comparator, is less than the reference voltage, which said reference voltage is applied to the inverting input terminal of said comparator.
9. The method as in claim 8 further comprising the step of:
applying the output voltage at the output pin of a second comparator to an edge triggered control logic circuit.
applying the output voltage at the output pin of a second comparator to an edge triggered control logic circuit.
10. The method as in claim 9 further comprising the step of:
activating a motor switch when detecting a change in the output state of the second comparator.
activating a motor switch when detecting a change in the output state of the second comparator.
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US09/780,733 | 2001-02-09 | ||
US09/780,733 US6592067B2 (en) | 2001-02-09 | 2001-02-09 | Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor |
US09/966,275 | 2001-09-27 | ||
US09/966,275 US6838887B2 (en) | 2001-02-09 | 2001-09-27 | Proximity detection circuit and method of detecting small capacitance changes |
Publications (2)
Publication Number | Publication Date |
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CA2370828A1 CA2370828A1 (en) | 2002-08-09 |
CA2370828C true CA2370828C (en) | 2009-07-28 |
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CA002370828A Expired - Lifetime CA2370828C (en) | 2001-02-09 | 2002-02-08 | Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor |
CA002370835A Expired - Lifetime CA2370835C (en) | 2001-02-09 | 2002-02-08 | Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor |
CA2371079A Expired - Lifetime CA2371079C (en) | 2001-02-09 | 2002-02-08 | Static build up control in electronic dispensing systems |
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Application Number | Title | Priority Date | Filing Date |
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CA002370835A Expired - Lifetime CA2370835C (en) | 2001-02-09 | 2002-02-08 | Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor |
CA2371079A Expired - Lifetime CA2371079C (en) | 2001-02-09 | 2002-02-08 | Static build up control in electronic dispensing systems |
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US (8) | US6592067B2 (en) |
EP (4) | EP1230886B1 (en) |
AT (1) | ATE283659T1 (en) |
CA (3) | CA2370828C (en) |
DK (1) | DK1230886T3 (en) |
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PT (2) | PT1231823E (en) |
Families Citing this family (199)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030061760A1 (en) * | 2001-03-08 | 2003-04-03 | Bernard Tao | Vegetable lipid-based composition and candle |
US9724840B2 (en) | 1999-10-01 | 2017-08-08 | Sd3, Llc | Safety systems for power equipment |
US7225712B2 (en) | 2000-08-14 | 2007-06-05 | Sd3, Llc | Motion detecting system for use in a safety system for power equipment |
US8061245B2 (en) | 2000-09-29 | 2011-11-22 | Sd3, Llc | Safety methods for use in power equipment |
US8065943B2 (en) | 2000-09-18 | 2011-11-29 | Sd3, Llc | Translation stop for use in power equipment |
US7827890B2 (en) | 2004-01-29 | 2010-11-09 | Sd3, Llc | Table saws with safety systems and systems to mount and index attachments |
US9927796B2 (en) | 2001-05-17 | 2018-03-27 | Sawstop Holding Llc | Band saw with improved safety system |
US20030056853A1 (en) | 2001-09-21 | 2003-03-27 | Gass Stephen F. | Router with improved safety system |
US7377199B2 (en) | 2000-09-29 | 2008-05-27 | Sd3, Llc | Contact detection system for power equipment |
US7210383B2 (en) | 2000-08-14 | 2007-05-01 | Sd3, Llc | Detection system for power equipment |
US7600455B2 (en) | 2000-08-14 | 2009-10-13 | Sd3, Llc | Logic control for fast-acting safety system |
US7712403B2 (en) | 2001-07-03 | 2010-05-11 | Sd3, Llc | Actuators for use in fast-acting safety systems |
US7707920B2 (en) | 2003-12-31 | 2010-05-04 | Sd3, Llc | Table saws with safety systems |
US7024975B2 (en) | 2000-08-14 | 2006-04-11 | Sd3, Llc | Brake mechanism for power equipment |
US20020017179A1 (en) | 2000-08-14 | 2002-02-14 | Gass Stephen F. | Miter saw with improved safety system |
US7836804B2 (en) | 2003-08-20 | 2010-11-23 | Sd3, Llc | Woodworking machines with overmolded arbors |
US8459157B2 (en) | 2003-12-31 | 2013-06-11 | Sd3, Llc | Brake cartridges and mounting systems for brake cartridges |
US7536238B2 (en) | 2003-12-31 | 2009-05-19 | Sd3, Llc | Detection systems for power equipment |
US6857345B2 (en) | 2000-08-14 | 2005-02-22 | Sd3, Llc | Brake positioning system |
US20030213809A1 (en) * | 2000-02-10 | 2003-11-20 | Norman Weigen | Message delivery apparatus and system for paper dispensers and similar devices |
US6813983B2 (en) | 2000-09-29 | 2004-11-09 | Sd3, Llc | Power saw with improved safety system |
US6826988B2 (en) | 2000-09-29 | 2004-12-07 | Sd3, Llc | Miter saw with improved safety system |
US6592067B2 (en) | 2001-02-09 | 2003-07-15 | Georgia-Pacific Corporation | Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor |
US7102366B2 (en) * | 2001-02-09 | 2006-09-05 | Georgia-Pacific Corporation | Proximity detection circuit and method of detecting capacitance changes |
US7017856B2 (en) * | 2001-02-09 | 2006-03-28 | Georgia-Pacific Corporation | Static build-up control in dispensing system |
US20030200725A1 (en) * | 2001-06-29 | 2003-10-30 | Aloisi Robert J. | Packaging material and products comprising indicia-former which changes from a first visual condition to a second visual condition and indicates a characteristic of the package contents |
DE10252425A1 (en) * | 2002-02-21 | 2004-02-05 | Robert Bosch Gmbh | Locating enclosed objects involves using phase measurement with measurement parameter correlated with capacitive sensor shift current to produce depth information for object in medium |
US7341170B2 (en) | 2002-03-07 | 2008-03-11 | Georgia-Pacific Consumer Operations Llc | Apparatus and methods usable in connection with dispensing flexible sheet material from a roll |
US6672860B2 (en) * | 2002-04-10 | 2004-01-06 | Hon Technology Inc. | Proximity warning system for a fireplace |
US6977588B2 (en) * | 2002-06-03 | 2005-12-20 | Alwin Manufacturing Co. | Automatic dispenser apparatus |
CA2390411A1 (en) * | 2002-06-03 | 2003-12-03 | Alwin Manufacturing Company, Incorporated | Automatic dispenser apparatus |
US7494563B2 (en) | 2002-10-07 | 2009-02-24 | Georgia-Pacific Consumer Products Lp | Fabric creped absorbent sheet with variable local basis weight |
US7585389B2 (en) * | 2005-06-24 | 2009-09-08 | Georgia-Pacific Consumer Products Lp | Method of making fabric-creped sheet for dispensers |
US8603296B2 (en) | 2002-10-07 | 2013-12-10 | Georgia-Pacific Consumer Products Lp | Method of making a fabric-creped absorbent cellulosic sheet with improved dispensing characteristics |
US20050017119A1 (en) * | 2003-06-05 | 2005-01-27 | Junji Owa | Rolled paper feeding device |
ITMI20031465A1 (en) * | 2003-07-17 | 2005-01-18 | Steiner Company Internat S A | DEVICE FOR DISPENSING PAPER SHEETS MANUFACTURED FROM A CONTINUOUS RIBBON WITH A SPRING MECHANISM OF A SPARE ROLL |
US7726599B2 (en) * | 2003-12-31 | 2010-06-01 | Kimberly-Clark Worldwide, Inc. | Apparatus and method for dispensing sheet material |
US7690395B2 (en) * | 2004-01-12 | 2010-04-06 | Masco Corporation Of Indiana | Multi-mode hands free automatic faucet |
US7213782B2 (en) | 2004-01-30 | 2007-05-08 | Charles Agnew Osborne | Intelligent dispensing system |
US8293072B2 (en) | 2009-01-28 | 2012-10-23 | Georgia-Pacific Consumer Products Lp | Belt-creped, variable local basis weight absorbent sheet prepared with perforated polymeric belt |
FR2872806B1 (en) | 2004-07-06 | 2006-09-15 | Georgia Pacific France Soc En | ROLLER DISTRIBUTION SYSTEM OF CONDUCTIVE CHUCK PAPERS |
US7614331B2 (en) * | 2004-11-05 | 2009-11-10 | Lloyd G Schaefer | Organizer for dispensing rolled goods |
US7296765B2 (en) * | 2004-11-29 | 2007-11-20 | Alwin Manufacturing Co., Inc. | Automatic dispensers |
US7398944B2 (en) * | 2004-12-01 | 2008-07-15 | Kimberly-Clark Worldwide, Inc. | Hands-free electronic towel dispenser |
US7380748B2 (en) * | 2004-12-14 | 2008-06-03 | Georgia-Pacific Consumer Products Lp | Towel dispenser with improved drive roll and improved dispensing chute |
BRPI0519763B1 (en) * | 2004-12-30 | 2018-10-23 | Colman Group Inc | improved distributor for laminated material |
CA2612663C (en) | 2005-06-24 | 2015-05-12 | Georgia-Pacific Consumer Products Lp | Fabric-creped sheet for dispensers |
AU2005334399B2 (en) * | 2005-07-13 | 2010-05-13 | Sca Hygiene Products Ab | Automated dispenser sensor arrangement |
CN101223693B (en) * | 2005-07-13 | 2011-04-27 | Sca卫生产品股份公司 | Automatic allocation machine with sensor arrangement |
WO2007006331A1 (en) * | 2005-07-13 | 2007-01-18 | Sca Hygiene Products Ab | Automated dispenser |
US8082827B2 (en) | 2005-10-07 | 2011-12-27 | Dispensing Dynamics International Ltd. | Hybrid towel dispenser |
US20070079676A1 (en) * | 2005-10-07 | 2007-04-12 | Global Plastics | Paper dispenser |
US7710205B2 (en) * | 2005-11-28 | 2010-05-04 | Seagate Technology Llc | Capacitor detection by phase shift |
CA2533000C (en) * | 2005-12-08 | 2011-07-05 | Alwin Manufacturing Co., Inc | Method and apparatus for controlling a dispenser and detecting a user |
ES2662473T3 (en) * | 2005-12-14 | 2018-04-06 | Sca Hygiene Products Ab | Distributor load arrangement and distributor load method |
EP1959805B1 (en) * | 2005-12-14 | 2009-05-27 | SCA Hygiene Products AB | Automated dispenser with a paper sensing system |
US20070182545A1 (en) * | 2006-02-02 | 2007-08-09 | Xpresense Llc | Sensed condition responsive wireless remote control device using inter-message duration to indicate sensor reading |
US20080245922A1 (en) * | 2007-04-09 | 2008-10-09 | Fellhoelter Scott T | Automatic multi-roll touch-less toilet paper dispenser |
US9370283B2 (en) | 2006-02-06 | 2016-06-21 | Scott Fellhoelter | Paper product dispenser |
US10376109B2 (en) | 2006-02-06 | 2019-08-13 | Scott Fellhoelter | Paper product dispenser |
FR2897348A1 (en) * | 2006-02-14 | 2007-08-17 | Maurice Granger | DEVICE FOR CENTERING A COIL OF WOUND MATERIAL IN A TOWING EQUIPMENT DISPENSING APPARATUS |
WO2007098419A2 (en) * | 2006-02-18 | 2007-08-30 | Georgia-Pacific Consumer Products Lp | Electronic dispenser for dispensing sheet products |
US8040142B1 (en) | 2006-03-31 | 2011-10-18 | Cypress Semiconductor Corporation | Touch detection techniques for capacitive touch sense systems |
US8004497B2 (en) | 2006-05-18 | 2011-08-23 | Cypress Semiconductor Corporation | Two-pin buttons |
US20080008865A1 (en) * | 2006-06-23 | 2008-01-10 | Georgia-Pacific Consumer Products Lp | Antimicrobial hand towel for touchless automatic dispensers |
DK2040594T3 (en) * | 2006-07-07 | 2018-06-06 | Sca Hygiene Prod Ab | DISPENSES FOR ARCHFORM PRODUCTS |
CA2657039C (en) * | 2006-07-18 | 2014-02-04 | Georgia-Pacific Consumer Products Lp | Power supply systems for dispensers and methods of powering dispensers |
CA2664854C (en) * | 2006-10-03 | 2014-12-23 | Georgia-Pacific Consumer Products Lp | Easy load sheet product dispenser |
WO2008042962A2 (en) | 2006-10-03 | 2008-04-10 | Georgia-Pacific Consumer Products Lp | Automated sheet product dispenser |
EP2377442A1 (en) * | 2006-10-03 | 2011-10-19 | Georgia-Pacific Consumer Products LP | Automated tissue dispenser |
US7878446B2 (en) | 2006-10-20 | 2011-02-01 | Georgia-Pacific Consumer Products Lp | Dispenser housing with motorized roller transport |
GB2456937B (en) | 2006-10-24 | 2011-07-13 | Bradley Fixtures Corp | Capacitive sensing for washroom fixture |
US7946522B2 (en) * | 2006-10-30 | 2011-05-24 | Kimberly-Clark Worldwide, Inc. | System and method for dissipating static electricity in an electronic sheet material dispenser |
US20080100982A1 (en) * | 2006-10-30 | 2008-05-01 | Lewis Richard P | System and method for dissipating static electricity in an electronic sheet material dispenser |
FR2907654B1 (en) | 2006-10-31 | 2010-01-29 | Georgia Pacific France | PROCESS, MANUFACTURING DEVICE AND ASSOCIATED ROLLS FORMED OF CUTTING SHEETS AND ALTERNATE PREDECOUPLES |
US11297984B2 (en) | 2006-10-31 | 2022-04-12 | Gpcp Ip Holdings Llc | Automatic napkin dispenser |
US7523885B2 (en) * | 2006-10-31 | 2009-04-28 | Kimberly-Clark Worldwide, Inc. | Hands-free electronic towel dispenser with power saving feature |
US20080135595A1 (en) * | 2006-10-31 | 2008-06-12 | Shih-Kuo Chang | Toilet Paper Case To Prevent Contamination |
US8547114B2 (en) | 2006-11-14 | 2013-10-01 | Cypress Semiconductor Corporation | Capacitance to code converter with sigma-delta modulator |
US8159462B1 (en) * | 2006-11-15 | 2012-04-17 | Cypress Semiconductor Corporation | Reference voltage offset for capacitive touch-sensor measurement |
US9002484B2 (en) * | 2006-12-01 | 2015-04-07 | The Invention Science Fund I Llc | System and method for deforming surfaces |
US9243392B2 (en) | 2006-12-19 | 2016-01-26 | Delta Faucet Company | Resistive coupling for an automatic faucet |
US8058937B2 (en) | 2007-01-30 | 2011-11-15 | Cypress Semiconductor Corporation | Setting a discharge rate and a charge rate of a relaxation oscillator circuit |
WO2008094651A1 (en) | 2007-01-31 | 2008-08-07 | Masco Corporation Of Indiana | Capacitive sensing apparatus and method for faucets |
US7806141B2 (en) * | 2007-01-31 | 2010-10-05 | Masco Corporation Of Indiana | Mixing valve including a molded waterway assembly |
EP3058858B1 (en) | 2007-03-06 | 2018-05-09 | Alwin Manufacturing Co., Inc. | Sheet material dispenser |
US8376313B2 (en) * | 2007-03-28 | 2013-02-19 | Masco Corporation Of Indiana | Capacitive touch sensor |
US9500686B1 (en) | 2007-06-29 | 2016-11-22 | Cypress Semiconductor Corporation | Capacitance measurement system and methods |
US8570053B1 (en) | 2007-07-03 | 2013-10-29 | Cypress Semiconductor Corporation | Capacitive field sensor with sigma-delta modulator |
US8169238B1 (en) | 2007-07-03 | 2012-05-01 | Cypress Semiconductor Corporation | Capacitance to frequency converter |
US7887005B2 (en) | 2007-09-12 | 2011-02-15 | Innovia Intellectual Properties, Llc | Easy-load household automatic paper towel dispenser |
BRPI0818388B1 (en) * | 2007-10-22 | 2019-01-15 | Colman Group Inc | apparatus for dispensing product from a roll, method of regulating product distribution from a dispensing apparatus and roll of sheet material for use with an automatic dispensing device |
US8066217B2 (en) | 2007-10-22 | 2011-11-29 | Georgia-Pacific Consumer Products Lp | Dispenser and dispensing method having communication abilities |
ES2614093T3 (en) | 2007-11-13 | 2017-05-29 | Sca Tissue France | System to increase the water resistance of a roll distributor |
EP2574701A1 (en) | 2007-12-11 | 2013-04-03 | Masco Corporation Of Indiana | Electrically controlled Faucet |
EA201070785A1 (en) | 2007-12-21 | 2011-04-29 | Джорджия-Пэсифик Консьюмер Продактс Лп | PRODUCT, DISTRIBUTION DEVICE AND METHOD FOR DISTRIBUTING A PRODUCT |
US8833691B1 (en) * | 2007-12-21 | 2014-09-16 | Georgia-Pacific Consumer Products Lp | Product, dispenser and method of dispensing product |
US8525798B2 (en) | 2008-01-28 | 2013-09-03 | Cypress Semiconductor Corporation | Touch sensing |
US20090189009A1 (en) * | 2008-01-29 | 2009-07-30 | Georgia-Pacific Consumer Products Lp | Rolled product dispenser and holder for use therewith |
US8358142B2 (en) | 2008-02-27 | 2013-01-22 | Cypress Semiconductor Corporation | Methods and circuits for measuring mutual and self capacitance |
US8319505B1 (en) | 2008-10-24 | 2012-11-27 | Cypress Semiconductor Corporation | Methods and circuits for measuring mutual and self capacitance |
US9104273B1 (en) | 2008-02-29 | 2015-08-11 | Cypress Semiconductor Corporation | Multi-touch sensing method |
US20090217870A1 (en) * | 2008-03-03 | 2009-09-03 | Georgia-Pacific Consumer Products Lp | Sheet Product and Flowable Product Dispenser System |
US8361278B2 (en) | 2008-09-16 | 2013-01-29 | Dixie Consumer Products Llc | Food wrap base sheet with regenerated cellulose microfiber |
US8321174B1 (en) | 2008-09-26 | 2012-11-27 | Cypress Semiconductor Corporation | System and method to measure capacitance of capacitive sensor array |
AT508223B1 (en) | 2009-04-20 | 2011-06-15 | Hagleitner Hans Georg | SANITARY DISPENSER WITH CAPACITIVE SENSOR |
US20100277185A1 (en) * | 2009-05-01 | 2010-11-04 | Spectrum Technologies, Inc. | Soil moisture sensor |
US8616489B2 (en) * | 2009-05-08 | 2013-12-31 | Georgia-Pacific Consumer Products Lp | Sheet product dispenser |
US20100286818A1 (en) * | 2009-05-08 | 2010-11-11 | Georgia-Pacific Consumer Products Lp | Sheet product dispenser with sensor for sheet separation |
US9345367B2 (en) | 2009-05-27 | 2016-05-24 | Dispensing Dynamics International | Multi-function paper toweling dispenser |
US8382026B2 (en) * | 2009-05-27 | 2013-02-26 | Dispensing Dynamics International | Multi-function paper toweling dispenser |
WO2010141931A2 (en) | 2009-06-06 | 2010-12-09 | Innovia Intellectual Properties, Llc | Automatic paper towel dispenser apparatus |
US8723827B2 (en) | 2009-07-28 | 2014-05-13 | Cypress Semiconductor Corporation | Predictive touch surface scanning |
DE202009013428U1 (en) * | 2009-10-05 | 2011-03-03 | Schwelling, Hermann | Shredder with metal detection |
US8264848B2 (en) | 2009-10-30 | 2012-09-11 | Research In Motion Limited | Electrical assembly having impedance controlled signal traces |
US8807475B2 (en) * | 2009-11-16 | 2014-08-19 | Alwin Manufacturing Co., Inc. | Dispenser with low-material sensing system |
US8177156B1 (en) | 2009-11-23 | 2012-05-15 | Rinne Rhett L | Sheet roll dispenser |
CA2722650C (en) * | 2009-12-07 | 2018-05-01 | Georgia-Pacific Consumer Products Lp | Method of moist creping absorbent paper base sheet |
US9032565B2 (en) | 2009-12-16 | 2015-05-19 | Kohler Co. | Touchless faucet assembly and method of operation |
US8511599B2 (en) * | 2010-03-04 | 2013-08-20 | Richard LaLau | Paper towel dispensing systems |
US8776817B2 (en) | 2010-04-20 | 2014-07-15 | Masco Corporation Of Indiana | Electronic faucet with a capacitive sensing system and a method therefor |
US8561626B2 (en) | 2010-04-20 | 2013-10-22 | Masco Corporation Of Indiana | Capacitive sensing system and method for operating a faucet |
BR112012027063A2 (en) | 2010-04-22 | 2016-07-19 | Colman Group Inc | insert for use with a tissue material roll, and provision of a unique identifier for the tissue material roll |
UA106304C2 (en) | 2010-07-07 | 2014-08-11 | Ска Хайджин Продактс Аб | Apparatus for dispensing absorbent sheet products and method for modification thereof (embodiments) |
US8730643B2 (en) * | 2010-10-22 | 2014-05-20 | Sca Hygiene Products Ab | Apparatus with arc generator for dispensing absorbent sheet products |
US8382051B2 (en) * | 2010-12-09 | 2013-02-26 | Waxman Consumer Products Group Inc. | Wall-mounted support assembly for bathroom accessories |
CN102566502A (en) * | 2010-12-28 | 2012-07-11 | 鸿富锦精密工业(深圳)有限公司 | Human body approaching induction device |
US8919233B2 (en) * | 2010-12-30 | 2014-12-30 | Kimberly-Clark Worldwide, Inc. | Electronic pre-cut sheet dispenser with dispensing adjustments |
US10610064B2 (en) | 2011-06-08 | 2020-04-07 | Valve Solutions, Inc. | Electronic dispenser for flexible rolled sheet material |
USD802326S1 (en) | 2011-09-14 | 2017-11-14 | San Jamar, Inc. | Insert for a web material dispenser |
WO2013044385A1 (en) | 2011-09-26 | 2013-04-04 | Cascades Canada Ulc | Rolled product dispenser with multiple cutting blades and cutter assembly for a rolled product dispenser |
US10383489B2 (en) | 2012-02-10 | 2019-08-20 | Gpcp Ip Holdings Llc | Automatic napkin dispenser |
US10123666B2 (en) * | 2012-11-30 | 2018-11-13 | Gpcp Ip Holdings Llc | System and method for reducing waste using a sheet product dispenser |
US9089246B2 (en) | 2012-12-11 | 2015-07-28 | Georgia-Pacific Consumer Products Lp | Dispenser having more than one output drive condition |
US9756992B2 (en) | 2013-03-15 | 2017-09-12 | Vsi Import Solutions, Llc | Electronic residential tissue dispenser |
US9326648B2 (en) * | 2013-06-13 | 2016-05-03 | Dispensing Dynamics International | Dispensing system for consecutively dispensing paper sheet material from a stub roll and a primary roll |
US10602887B2 (en) | 2013-08-23 | 2020-03-31 | Gpcp Ip Holdings Llc | Towel dispensers |
US9596964B1 (en) | 2013-08-23 | 2017-03-21 | Innovia Intellectual Properties, Llc | Wall mounted towel dispensers |
US9642503B1 (en) | 2013-08-25 | 2017-05-09 | Innovia Intellectual Properties, Llc | Portable, vertically oriented automatic towel dispenser apparatus |
US9604811B2 (en) | 2013-10-01 | 2017-03-28 | Georgia-Pacific Consumer Products Lp | Automatic paper product dispenser with data collection and method |
AU2014341935B2 (en) | 2013-11-04 | 2018-07-05 | Essity Operations Wausau LLC | Dual roll paper dispenser with a single opening |
US9730559B2 (en) | 2014-04-10 | 2017-08-15 | Dispensing Dynamics International, Llc | Electro-mechanical paper sheet material dispenser with tail sensor |
US9907441B2 (en) | 2014-04-18 | 2018-03-06 | Vsi Import Solutions, Llc | Electronic residential tissue dispenser |
US9895033B2 (en) * | 2014-12-05 | 2018-02-20 | Dispensing Dynamics International, Llc | Dispenser apparatus with damper for dispensing paper toweling |
EP3352635A1 (en) * | 2015-05-08 | 2018-08-01 | Fellhoelter, Scott | Paper product dispenser |
US9746425B2 (en) | 2015-05-12 | 2017-08-29 | Gojo Industries, Inc. | Waste detection |
WO2016191404A1 (en) * | 2015-05-26 | 2016-12-01 | Invue Security Products Inc. | Merchandise display including sensor for detecting the presence of a customer |
CA2995124A1 (en) | 2015-09-14 | 2017-03-23 | Gpcp Ip Holdings Llc | Automated product dispensers and related methods for isolating a drive assembly to inhibit vibration transmission |
US11395566B2 (en) | 2016-04-11 | 2022-07-26 | Gpcp Ip Holdings Llc | Sheet product dispenser |
US11412900B2 (en) | 2016-04-11 | 2022-08-16 | Gpcp Ip Holdings Llc | Sheet product dispenser with motor operation sensing |
USD862107S1 (en) * | 2016-12-08 | 2019-10-08 | Hankscraft, Inc. | Dispenser cover |
CN110072417B (en) | 2016-12-30 | 2022-05-13 | 金伯利-克拉克环球有限公司 | Paper product dispenser |
CA2955055C (en) | 2017-01-17 | 2020-08-11 | Alwin Manufacturing Co., Inc. | Dispenser with noise dampener |
CN110494070A (en) | 2017-05-10 | 2019-11-22 | Gpcp知识产权控股有限责任公司 | Automatic paper product distributor and associated method |
WO2018213664A1 (en) | 2017-05-19 | 2018-11-22 | Bradley Fixtures Corporation | Automatic paper towel dispenser with lidar sensor |
KR102353494B1 (en) * | 2017-06-30 | 2022-01-20 | 삼성전자주식회사 | Electronic device for detecting proximity of user and operating method thereof |
US10660485B2 (en) | 2017-10-09 | 2020-05-26 | Gpcp Ip Holdings Llc | Dual roll product dispenser with rotating refill carriage |
US10850938B2 (en) | 2017-10-09 | 2020-12-01 | Gpcp Ip Holdings Llc | Mechanical sheet product dispenser |
US10362909B2 (en) * | 2017-11-20 | 2019-07-30 | Guangzhou Faner Aroma Product Co., Ltd. | Paper dispensing device |
USD860674S1 (en) | 2018-02-06 | 2019-09-24 | San Jamar, Inc. | Towel dispenser |
EP3761839B1 (en) | 2018-03-08 | 2023-09-06 | Dispensing Dynamics International, Inc. | Stub roll dispenser system |
CA3035709A1 (en) | 2018-03-09 | 2019-09-09 | Cascades Canada Ulc | Web material dispenser and method |
US10835086B2 (en) | 2018-04-09 | 2020-11-17 | Charles A. Osborne, JR. | Sheet material transfer system/assembly for a dispenser |
US11191397B2 (en) * | 2018-05-09 | 2021-12-07 | HyResults, LLC | Wipe dispensing system and method for producing disinfectant wipes on demand |
USD862109S1 (en) | 2018-05-16 | 2019-10-08 | Bradley Fixtures Corporation | Housing for a roll towel dispenser |
CA3099743A1 (en) | 2018-05-16 | 2019-11-21 | Bradley Fixtures Corporation | Roll towel dispenser |
USD854347S1 (en) | 2018-05-16 | 2019-07-23 | Bradley Fixtures Corporation | Roller for a roll towel dispenser |
US11187372B2 (en) * | 2018-09-20 | 2021-11-30 | Cascades Canada Ulc | Web material dispenser, back wall for a web material dispenser and method for securing a web material dispenser to a supporting surface |
EP3886667A4 (en) | 2018-11-28 | 2022-08-03 | Charles Agnew Osborne, Jr. | A sheet material dispenser assembly for selectively dispensing sheet material from a plurality of supplies of rolled sheet material |
US11051663B1 (en) | 2018-12-20 | 2021-07-06 | Christopher J. Danis | Dispensing assembly for paper products |
CN109650110B (en) * | 2018-12-20 | 2020-04-28 | 象山兑鹏电子科技有限公司 | Printer with function of quickly replacing printing paper |
US11771271B1 (en) | 2018-12-20 | 2023-10-03 | Christopher J. Danis | Dispensing assembly for paper products |
US10806307B2 (en) * | 2018-12-20 | 2020-10-20 | Christopher J. Danis | Dispensing assembly for paper products |
US11534037B2 (en) | 2019-03-04 | 2022-12-27 | Gpcp Ip Holdings Llc | Automated wetted or dry sheet product dispensers |
US11071416B2 (en) * | 2019-03-25 | 2021-07-27 | Hunter James Hollister | Product monitoring device |
WO2020210541A1 (en) | 2019-04-12 | 2020-10-15 | Dispensing Dynamics International, Inc. | Dispenser with automatic stub roll drop down |
US11692391B2 (en) * | 2019-05-07 | 2023-07-04 | Lafayette Venetian Blind, Inc. | Idle end assemby |
CN110151036B (en) * | 2019-05-16 | 2021-05-11 | 查理·安格纽欧斯本二世 | Paper feeding conversion device |
WO2020251841A1 (en) | 2019-06-14 | 2020-12-17 | Osborne Charles Agnew Jr | Loading and transfer system/assembly for sheet material dispensers |
CN110288771B (en) * | 2019-06-24 | 2021-09-10 | 北控滨南康健(重庆)环境工程有限公司 | Intelligent toilet paper supply system and method for public toilet |
WO2021016047A1 (en) | 2019-07-19 | 2021-01-28 | Dispensing Dynamics International, Inc. | Dispensing systems with floating support rollers |
USD915211S1 (en) | 2019-08-06 | 2021-04-06 | Kimberly-Clark Worldwide, Inc. | Cleaning product dispenser |
USD904066S1 (en) | 2019-09-19 | 2020-12-08 | Georgia-Pacific LLC | Core plug |
CA3145788C (en) * | 2019-10-30 | 2023-10-17 | Essity Hygiene And Health Aktiebolag | Dispenser for rolls of absorbent paper material |
US10847017B1 (en) * | 2020-03-17 | 2020-11-24 | Discovery Democracy LLC | Electronic face mask |
US11478112B2 (en) | 2020-03-25 | 2022-10-25 | San Jamar, Inc. | Water resistant roll material dispenser assembly and kit |
EP4138622A4 (en) * | 2020-04-21 | 2024-01-24 | Kimberly Clark Co | Dispenser with mechanical transfer and method |
US11636870B2 (en) | 2020-08-20 | 2023-04-25 | Denso International America, Inc. | Smoking cessation systems and methods |
US11760170B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Olfaction sensor preservation systems and methods |
US11760169B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Particulate control systems and methods for olfaction sensors |
US11881093B2 (en) | 2020-08-20 | 2024-01-23 | Denso International America, Inc. | Systems and methods for identifying smoking in vehicles |
US11932080B2 (en) | 2020-08-20 | 2024-03-19 | Denso International America, Inc. | Diagnostic and recirculation control systems and methods |
US11813926B2 (en) | 2020-08-20 | 2023-11-14 | Denso International America, Inc. | Binding agent and olfaction sensor |
US11828210B2 (en) | 2020-08-20 | 2023-11-28 | Denso International America, Inc. | Diagnostic systems and methods of vehicles using olfaction |
US11903532B2 (en) | 2020-11-23 | 2024-02-20 | Gpcp Ip Holdings Llc | Product removal switch shuttle for product dispensers |
CN112902800B (en) * | 2021-01-20 | 2022-09-23 | 宁夏筑之信检测有限公司 | Steel bar diameter measuring device |
WO2023107624A1 (en) * | 2021-12-08 | 2023-06-15 | Bradley Corporation | Toilet paper dispenser |
US11812897B1 (en) | 2022-02-20 | 2023-11-14 | Christopher J. Danis | Dispensing assembly for paper products |
CN116118273B (en) * | 2022-11-08 | 2023-11-10 | 深圳市富康达塑胶制品有限公司 | Material coiling device of bag making machine |
Family Cites Families (153)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2193759A (en) | 1936-07-20 | 1940-03-12 | Steiner Sales Co | Towel dispensing time-stop mechanism |
US2839345A (en) | 1952-01-23 | 1958-06-17 | Bay West Paper Company | Cabinet mechanism for dispensing prededtermined lengths of a web such as towelling |
US2930663A (en) | 1955-01-19 | 1960-03-29 | Raymond L Weiss | Towel dispenser |
US2859814A (en) | 1956-02-06 | 1958-11-11 | Towlsaver Inc | Control system for dispenser for strip material |
US3007650A (en) | 1959-01-12 | 1961-11-07 | Crown Zellerbach Corp | Two-roll towel dispensing cabinet |
US3167368A (en) * | 1962-07-24 | 1965-01-26 | Rozlog Matt | Sheet material dispenser |
US3269592A (en) | 1963-09-26 | 1966-08-30 | Alwin Mfg Company | Universal towel dispenser |
US3288387A (en) | 1964-12-08 | 1966-11-29 | Jr William J Craven | Paper towel dispenser |
US3384280A (en) | 1966-07-18 | 1968-05-21 | Mirra Cote Company Inc | Dispensing apparatus |
US3573783A (en) | 1967-09-13 | 1971-04-06 | R F Controls Inc | Proximity sensor |
GB1247296A (en) | 1968-09-13 | 1971-09-22 | Hitachi Ltd | A method of and an apparatus for detecting the position of the end of a coil of strip material |
GB1327195A (en) | 1969-09-18 | 1973-08-15 | Dunlop Holdings Ltd | Pneumatic tyres |
US3628743A (en) * | 1969-11-04 | 1971-12-21 | Scott Paper Co | Dispensing cabinet for sheet material |
US3665783A (en) * | 1970-01-29 | 1972-05-30 | Gen Motors Corp | Steering gear assembly |
US3730409A (en) | 1970-03-28 | 1973-05-01 | Steiner Co Lausanne Sa | Dispensing apparatus |
US3636408A (en) | 1970-05-26 | 1972-01-18 | Technical Tape Corp | Tape dispenser with static electricity neutralizer |
US3743865A (en) * | 1971-12-29 | 1973-07-03 | W Riechmann | Proximity switch |
US3858951A (en) | 1972-03-29 | 1975-01-07 | Georgia Pacific Corp | Towel dispenser |
US3917191A (en) | 1972-04-12 | 1975-11-04 | Fort Howard Paper Co | Paper towel dispenser and transfer mechanism |
US3836828A (en) | 1972-07-21 | 1974-09-17 | Weldotron Corp | Electronic protection and sensing apparatus |
JPS5712988B2 (en) | 1972-12-29 | 1982-03-13 | ||
US4165138A (en) | 1976-11-15 | 1979-08-21 | Mosinee Paper Company | Dispenser cabinet for sheet material and transfer mechanism |
DE2658385C2 (en) | 1976-12-23 | 1982-05-13 | Karl-Heinz 4800 Bielefeld Honsel | Unwinding station for material webs |
CH615818A5 (en) | 1977-04-19 | 1980-02-29 | Apura Gmbh | |
US4099118A (en) | 1977-07-25 | 1978-07-04 | Franklin Robert C | Electronic wall stud sensor |
US4106684A (en) | 1977-08-26 | 1978-08-15 | Crown Zellerbach Corporation | Sheet material dispensing device |
US4172461A (en) | 1977-11-14 | 1979-10-30 | Pangburn William E | Nail form |
GB2042961B (en) | 1979-02-20 | 1982-09-22 | Masson Scott Thrissell Eng Ltd | Cutting apparatus for continuous webs |
IT1122889B (en) | 1979-08-30 | 1986-04-30 | Burgo Scott Spa | BELT DISTRIBUTOR OF MATERIAL |
US4358169A (en) | 1980-07-25 | 1982-11-09 | Griffith-Hope Company | Dispenser for coiled sheet material |
US4363070A (en) * | 1980-09-02 | 1982-12-07 | Polaroid Corporation | Neutralization of electrostatic charges |
US4475163A (en) | 1980-11-03 | 1984-10-02 | Continental Emsco | System for calculating and displaying cable payout from a rotatable drum storage device |
US4378912A (en) | 1981-11-12 | 1983-04-05 | Crown Zellerbach Corporation | Sheet material dispenser apparatus |
US4464622A (en) | 1982-03-11 | 1984-08-07 | Franklin Robert C | Electronic wall stud sensor |
FR2539293A1 (en) | 1983-01-13 | 1984-07-20 | Granger Maurice | Apparatus for dispensing strips of wound material with a device for automatic replacement of the roll in use |
US4552315A (en) | 1983-01-13 | 1985-11-12 | Maurice Granger | Rolled web dispenser |
US4605988A (en) | 1983-02-25 | 1986-08-12 | Herman Miller, Inc. | Anti-static grounding arrangement for work environment system |
DE3342921A1 (en) | 1983-11-26 | 1985-06-05 | Leonhard 6983 Kreuzwertheim Tratz | Dispenser for dispensing a rolled product in sheet form |
US4569467A (en) | 1984-03-05 | 1986-02-11 | Bernard Kaminstein | Dispenser for automatically advancing a length of web |
IT1184385B (en) | 1985-04-05 | 1987-10-28 | Steiner Co Int Sa | Dispensing appts. for paper towels of set length |
US4738176A (en) | 1985-04-04 | 1988-04-19 | Cassia Antonio M | Electric paper cabinet |
DE3513051A1 (en) * | 1985-04-12 | 1986-10-23 | FHN-Verbindungstechnik GmbH, 8501 Eckental | Motor-actuated car window with a jamming safeguard |
FR2583729B1 (en) | 1985-06-20 | 1987-09-18 | Granger Maurice | SIMPLIFIED APPARATUS FOR SIMULTANEOUSLY DISPENSING AND CUTTING BANDS OF WOUND MATERIALS WITH AUTOMATIC CHANGING OF THE ROLLER IN SERVICE. |
US4611768A (en) | 1985-07-01 | 1986-09-16 | Mosinee Paper Corporation | Modular paper towel dispenser |
FR2584560B1 (en) | 1985-07-03 | 1990-05-11 | Telephonie Ind Commerciale | ELECTROSTATIC CHARGE ERASER |
US4712461A (en) | 1985-10-18 | 1987-12-15 | Georgia-Pacific Corporation | Rolled material dispenser with feed roller containing a sliding cutter |
US4666099A (en) | 1985-11-15 | 1987-05-19 | Scott Paper Company | Apparatus for dispensing sheet material |
US4741340A (en) * | 1985-12-18 | 1988-05-03 | Cordis Corporation | Pulse to sinewave telemetry system |
US4807823A (en) | 1986-02-18 | 1989-02-28 | Wyant & Company Limited/La Compagnie Wyant Limitee | Bathroom tissue dispenser |
US4721265A (en) | 1986-06-09 | 1988-01-26 | Hawkins F Jr | Electronic toilet tissue dispenser |
US4796825A (en) | 1986-06-09 | 1989-01-10 | Hawkins F Jr | Electronic paper towel dispenser |
US4823663A (en) | 1987-03-02 | 1989-04-25 | Xerox Corporation | Cut sheet roll supply |
US4756485A (en) | 1987-03-11 | 1988-07-12 | Scott Paper Company | Dispenser for multiple rolls of sheet material |
JPS63295344A (en) | 1987-05-22 | 1988-12-01 | Konica Corp | Grounding device for document conveying device |
US5045327A (en) * | 1987-06-24 | 1991-09-03 | Sound Memory Corporation | Digital recording and playback module system |
US5107734A (en) * | 1987-07-22 | 1992-04-28 | Armbruster Joseph M | Electrically powered dispenser for rolled sheet material |
US4760492A (en) * | 1987-10-13 | 1988-07-26 | Walsh Frances C | Combined form feed and storage, printer stand and carrying case |
US4846412A (en) | 1987-12-03 | 1989-07-11 | Wyant & Company Limited | Two roll sheet material dispenser |
US4790490A (en) | 1988-02-29 | 1988-12-13 | Shyamal Chakravorty | Self-locking, driver mechanism regulated tissue dispensing system with hands-free operation option |
US4826262A (en) | 1988-03-04 | 1989-05-02 | Steiner Company, Inc. | Electronic towel dispenser |
US4944466A (en) * | 1988-07-14 | 1990-07-31 | Georgia-Pacific Corporation | Flexible sheet material dispenser with automatic roll transferring mechanism |
US4807824A (en) | 1988-06-27 | 1989-02-28 | James River Ii, Inc. | Paper roll towel dispenser |
US4960248A (en) | 1989-03-16 | 1990-10-02 | Bauer Industries, Inc. | Apparatus and method for dispensing toweling |
US4992907A (en) | 1989-05-12 | 1991-02-12 | Hewlett-Packard Company | Electrostatic discharge protection system |
US5031258A (en) | 1989-07-12 | 1991-07-16 | Bauer Industries Inc. | Wash station and method of operation |
DE4004122A1 (en) | 1990-02-10 | 1991-08-14 | Feldmuehle Gmbh Scott | DEVICE FOR DISPENSING TRACK SECTIONS |
DE4004124A1 (en) | 1990-02-10 | 1991-08-14 | Feldmuehle Gmbh Scott | Dispenser for sections of roll of material - incorporates slide surface with friction coating, blade with lever and return spring |
ATE93375T1 (en) | 1990-06-01 | 1993-09-15 | Steiner Co Inc | SYSTEM FOR SELECTIVE ACTIVATION OF DONORS. |
CA2039382C (en) | 1991-03-12 | 1999-01-05 | Paul A. Omdoll | Dispenser for rolled sheet material |
US5670886A (en) * | 1991-05-22 | 1997-09-23 | Wolf Controls Corporation | Method and apparatus for sensing proximity or position of an object using near-field effects |
US5302167A (en) | 1991-07-30 | 1994-04-12 | Scott Paper Company | Embossing dispenser roll transfer assembly |
US5271574A (en) | 1991-08-28 | 1993-12-21 | Georgia-Pacific Corporation | Dispenser for flexible sheet material |
GB2260195A (en) * | 1991-09-27 | 1993-04-07 | Carters | Capacitative proximity switch controlled apparatus |
EP0539985B1 (en) | 1991-10-31 | 1996-03-20 | Japan Tobacco Inc. | Device for connecting web end portions |
DE4138800A1 (en) | 1991-11-26 | 1993-05-27 | Signode Bernpak Gmbh | METHOD AND DEVICE FOR AVOIDING OPERATING INTERRUPTIONS ON MACHINES FOR STRAPPING PACKAGES |
US5148126A (en) * | 1991-12-13 | 1992-09-15 | Sentech Corporation | Capacitance sensor circuit and method for measuring capacitance and small changes in capacitance |
US5205454A (en) | 1992-05-18 | 1993-04-27 | James River Ii, Inc. | Paper towel dispensing system |
US5235882A (en) | 1992-05-26 | 1993-08-17 | Rabourn William B | Device for trimming and cutting computer printer paper |
CA2090776C (en) | 1992-05-28 | 1999-10-12 | Scott J. Collins | Dispenser for multiple rolls of sheet material |
US5217035A (en) | 1992-06-09 | 1993-06-08 | International Sanitary Ware Mfg. Cy, S.A. | System for automatic control of public washroom fixtures |
US5694653A (en) | 1992-06-18 | 1997-12-09 | Harald; Phillipp | Water control sensor apparatus and method |
GB9222968D0 (en) | 1992-11-03 | 1992-12-16 | Wyant And Company Limited | Perforated paper towel dispenser |
US5417783A (en) * | 1992-11-30 | 1995-05-23 | Moore Business Forms, Inc. | Linerless label dispenser |
US5375785A (en) | 1992-12-02 | 1994-12-27 | Georgia-Pacific Corporation | Automatic web transfer mechanism for flexible sheet dispenser |
US5452832A (en) | 1993-04-06 | 1995-09-26 | Qts S.R.L. | Automatic dispenser for paper towels severable from a continuous roll |
US5365783A (en) | 1993-04-30 | 1994-11-22 | Packard Instrument Company, Inc. | Capacitive sensing system and technique |
IT1263454B (en) | 1993-07-05 | 1996-08-05 | Gd Spa | METHOD AND DEVICE FOR THE REPLACEMENT OF TAPE MATERIAL IN AN OPERATING MACHINE. |
JP3078688B2 (en) | 1993-10-15 | 2000-08-21 | 富士写真フイルム株式会社 | Photosensitive material cutting device |
EP0728116B1 (en) | 1993-11-11 | 1999-08-04 | Packline Limited | Packaging |
US5511743A (en) | 1993-11-23 | 1996-04-30 | Miles, Inc. | Media input selector and method |
DE4417827C2 (en) * | 1994-05-20 | 1996-04-04 | Linde Ag | Method and sensor for presence detection of people |
IT1278337B1 (en) | 1994-09-19 | 1997-11-17 | Durst Phototechnik Spa | PROVISION FOR TENSIONING OF COILED MATERIAL. |
US5604992A (en) | 1995-01-18 | 1997-02-25 | Robinson; Joe M. | Dual roll dispenser |
US5558302A (en) | 1995-02-07 | 1996-09-24 | Georgia-Pacific Corporation | Flexible sheet material dispenser with automatic roll transferring mechanism |
BR9607104A (en) | 1995-02-07 | 1997-11-04 | Maurice Granger | Wiping material dispensing apparatus |
FR2731608B1 (en) | 1995-03-15 | 1997-05-09 | Granger Maurice | LOADING DEVICE FOR APPARATUS FOR DISPENSING WIPING MATERIALS |
US5505129A (en) | 1995-05-03 | 1996-04-09 | Macmillan Bloedel Limited | Web width tracking |
US5625327A (en) | 1995-07-13 | 1997-04-29 | Gnuco Technology Corporation | Modified Colpitts oscillator for driving an antenna coil and generating a clock signal |
US5630526A (en) | 1995-10-31 | 1997-05-20 | James River Corporation Of Virginia | Sheet material dispensing system |
US5704566A (en) | 1995-10-31 | 1998-01-06 | James River Corporation Of Virginia | Paper towel roll with variegated perforations |
US6118469A (en) * | 1995-11-21 | 2000-09-12 | Seiko Epson Corporation | Thermal printer |
US6069354A (en) | 1995-11-30 | 2000-05-30 | Alfano; Robert R. | Photonic paper product dispenser |
US5730165A (en) | 1995-12-26 | 1998-03-24 | Philipp; Harald | Time domain capacitive field detector |
US6297627B1 (en) | 1996-01-17 | 2001-10-02 | Allegro Microsystems, Inc. | Detection of passing magnetic articles with a peak-to-peak percentage threshold detector having a forcing circuit and automatic gain control |
US5772291A (en) | 1996-02-16 | 1998-06-30 | Mosinee Paper Corporation | Hands-free paper towel dispensers |
US6695246B1 (en) | 1996-02-16 | 2004-02-24 | Bay West Paper Corporation | Microprocessor controlled hands-free paper towel dispenser |
US5682032A (en) | 1996-02-22 | 1997-10-28 | Philipp; Harald | Capacitively coupled identity verification and escort memory apparatus |
JP3462003B2 (en) | 1996-05-09 | 2003-11-05 | 長野富士通コンポーネント株式会社 | Thermal printer |
US5917314A (en) * | 1996-08-08 | 1999-06-29 | Zircon Corporation | Electronic wall-stud sensor with three capacitive elements |
US6032898A (en) | 1996-08-29 | 2000-03-07 | Alwin Manufacturing Co. | Multiple roll towel dispenser |
US5806203A (en) | 1997-05-27 | 1998-09-15 | Robinson; Joe M. | Combination drying unit |
US5833413A (en) | 1997-07-11 | 1998-11-10 | Cynthia Cornelius | Inflatable cargo load lock |
US6067673A (en) | 1997-07-18 | 2000-05-30 | Kohler Company | Bathroom fixture using radar detector having leaky transmission line to control fluid flow |
US5986549A (en) * | 1997-07-23 | 1999-11-16 | Teodorescu; Horia-Nicolai | Position and movement reasonant sensor |
US5950898A (en) | 1997-09-26 | 1999-09-14 | Instant Technologies, Incorporated | Lottery ticket dispensing apparatus |
FR2771620B1 (en) | 1997-12-01 | 1999-12-31 | Maurice Granger | WIPING PAPER DISPENSING APPARATUS |
US6360181B1 (en) | 1997-12-23 | 2002-03-19 | Kimberly-Clark Worldwide, Inc. | System and method for collecting data on product consumption |
US5974764A (en) | 1998-01-16 | 1999-11-02 | Deere & Company | Large round baler net wrapping device for dispensing net from a supply roll resting on a driven feed roll |
US5979822A (en) | 1998-09-30 | 1999-11-09 | Perrin Manufacturing Company | Apparatus for dispensing sheet material from a roll of sheet material |
US6293486B1 (en) | 1998-02-16 | 2001-09-25 | Mosinee Paper Corporation | Hands-free paper towel dispensers |
DE19820978A1 (en) | 1998-05-12 | 1999-11-18 | Blatz Wilhelm | Dispenser for paper hand towels |
US6412679B2 (en) | 1998-05-20 | 2002-07-02 | Georgia-Pacific Corporation | Paper towel dispenser |
US6152397A (en) | 1998-10-30 | 2000-11-28 | Kimberly-Clark Worldwide Inc. | Spacing member for a sheet material dispenser |
ES2189395T3 (en) | 1999-03-03 | 2003-07-01 | Sca Hygiene Prod Ab | DISPENSER FOR SHEET SHAPED MATERIAL ROLLS |
US7044421B1 (en) | 1999-04-20 | 2006-05-16 | The Colman Group, Inc. | Electronically controlled roll towel dispenser with data communication system |
US6354533B1 (en) | 1999-08-25 | 2002-03-12 | Georgia-Pacific Corporation | Web transfer mechanism for flexible sheet dispenser |
US6279777B1 (en) | 1999-09-14 | 2001-08-28 | Woodward Laboratories, Inc. | Dispensing control system |
US6145779A (en) | 1999-09-23 | 2000-11-14 | Kimberly-Clark Worldwide, Inc. | Dual roll transfer dispenser |
US6486680B1 (en) * | 2000-06-13 | 2002-11-26 | The North American Manufacturing Company | Edge detector |
US6519505B2 (en) | 2000-06-28 | 2003-02-11 | Georgia-Pacific Corporation | Integrated dispenser and business machine system |
US6592067B2 (en) * | 2001-02-09 | 2003-07-15 | Georgia-Pacific Corporation | Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor |
US7102366B2 (en) * | 2001-02-09 | 2006-09-05 | Georgia-Pacific Corporation | Proximity detection circuit and method of detecting capacitance changes |
US7017856B2 (en) * | 2001-02-09 | 2006-03-28 | Georgia-Pacific Corporation | Static build-up control in dispensing system |
US6766977B2 (en) | 2001-02-27 | 2004-07-27 | Georgia-Pacific Corporation | Sheet material dispenser with perforation sensor and method |
DE20108336U1 (en) | 2001-05-17 | 2001-08-02 | Compucase Entpr Co | Earthing device |
US6892620B2 (en) | 2001-12-19 | 2005-05-17 | Kimberly-Clark Worldwide, Inc. | Electro-mechanical roll product dispenser |
US6820785B2 (en) | 2001-12-20 | 2004-11-23 | Kimberly-Clark Worldwide, Inc. | Electrical roll product dispenser |
US7341170B2 (en) | 2002-03-07 | 2008-03-11 | Georgia-Pacific Consumer Operations Llc | Apparatus and methods usable in connection with dispensing flexible sheet material from a roll |
US20050109789A1 (en) | 2003-05-14 | 2005-05-26 | Katsumi Nagayoshi | Roll paper feeder |
US7774096B2 (en) | 2003-12-31 | 2010-08-10 | Kimberly-Clark Worldwide, Inc. | Apparatus for dispensing and identifying product in washrooms |
US7783380B2 (en) | 2003-12-31 | 2010-08-24 | Kimberly-Clark Worldwide, Inc. | System and method for measuring, monitoring and controlling washroom dispensers and products |
US7416152B2 (en) | 2004-11-12 | 2008-08-26 | Sca Tissue North America Llc | Dual-mount roll dispenser |
US7398944B2 (en) | 2004-12-01 | 2008-07-15 | Kimberly-Clark Worldwide, Inc. | Hands-free electronic towel dispenser |
BRPI0519763B1 (en) * | 2004-12-30 | 2018-10-23 | Colman Group Inc | improved distributor for laminated material |
JP4179285B2 (en) * | 2005-01-12 | 2008-11-12 | トヨタ自動車株式会社 | Parking assistance device |
US7185843B1 (en) | 2005-11-14 | 2007-03-06 | Li Wayne W | Two high bathroom tissue dispenser |
US7370825B2 (en) | 2005-11-29 | 2008-05-13 | Dominic Briante | Towel roll holder and dispenser and blank for forming container for the towel roll holder and dispenser |
US7644885B2 (en) | 2005-11-29 | 2010-01-12 | Adams & Wilks | Towel roll holder and dispenser |
WO2008042962A2 (en) | 2006-10-03 | 2008-04-10 | Georgia-Pacific Consumer Products Lp | Automated sheet product dispenser |
US7523885B2 (en) | 2006-10-31 | 2009-04-28 | Kimberly-Clark Worldwide, Inc. | Hands-free electronic towel dispenser with power saving feature |
US20100243696A1 (en) * | 2008-06-18 | 2010-09-30 | Matthew Friesen | Electronic roll towel dispenser |
US7996108B2 (en) | 2008-08-22 | 2011-08-09 | Georgia-Pacific Consumer Products Lp | Sheet product dispenser and method of operation |
FR2963224B1 (en) * | 2010-07-29 | 2012-08-17 | Georgia Pacific France | SYSTEM FOR DISTRIBUTING A TAPE OF ABSORBENT PRODUCT WRAPPED INTO A CONFORMING ROLL |
-
2001
- 2001-02-09 US US09/780,733 patent/US6592067B2/en not_active Expired - Lifetime
- 2001-09-27 US US09/966,124 patent/US6871815B2/en not_active Expired - Lifetime
- 2001-09-27 US US09/966,275 patent/US6838887B2/en not_active Expired - Lifetime
-
2002
- 2002-02-08 CA CA002370828A patent/CA2370828C/en not_active Expired - Lifetime
- 2002-02-08 CA CA002370835A patent/CA2370835C/en not_active Expired - Lifetime
- 2002-02-08 CA CA2371079A patent/CA2371079C/en not_active Expired - Lifetime
- 2002-02-11 AT AT02250925T patent/ATE283659T1/en active
- 2002-02-11 EP EP20020250925 patent/EP1230886B1/en not_active Expired - Lifetime
- 2002-02-11 DK DK02250925T patent/DK1230886T3/en active
- 2002-02-11 PT PT02250924T patent/PT1231823E/en unknown
- 2002-02-11 EP EP14190514.1A patent/EP2846466A3/en not_active Withdrawn
- 2002-02-11 ES ES02250925T patent/ES2234983T3/en not_active Expired - Lifetime
- 2002-02-11 EP EP20060118266 patent/EP1716800A3/en not_active Withdrawn
- 2002-02-11 EP EP20050110815 patent/EP1659691B1/en not_active Expired - Lifetime
- 2002-02-11 PT PT02250925T patent/PT1230886E/en unknown
-
2003
- 2003-05-21 US US10/442,601 patent/US6793170B2/en not_active Expired - Lifetime
-
2005
- 2005-02-03 US US11/052,496 patent/US7182289B2/en not_active Expired - Lifetime
-
2008
- 2008-06-02 US US12/131,368 patent/US8684297B2/en not_active Expired - Fee Related
-
2014
- 2014-02-20 US US14/185,172 patent/US9661958B2/en not_active Expired - Lifetime
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2017
- 2017-05-29 US US15/607,641 patent/US20170258278A1/en not_active Abandoned
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