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Publication numberUS2927789 A
Publication typeGrant
Publication dateMar 8, 1960
Filing dateJan 2, 1958
Priority dateJan 2, 1958
Publication numberUS 2927789 A, US 2927789A, US-A-2927789, US2927789 A, US2927789A
InventorsHenry A Hendrich, Francis W Walsh
Original AssigneeIbm
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Storage and feed means for a continuous web
US 2927789 A
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Description  (OCR text may contain errors)

March s, 1960 F. W. WALSH ETAL CONTINUOUS WEB of New York 13 Claims. (Cl. 2712.1)

such as a high speed automatic printing press.

tently or at variable rates.

the utilization device.

the first web accumulation.

embodiment of the invention.

STORAGE AND FEED MEANS FOR A Francis W. Walsh, Susquehanna, Pa., and Henry A. Hendrich, Endicott, N.Y., assignors to International Business Machines Corporation, New York, N .Y., a corporation Application January 2, 1958, Serial N 0. 706,670

This invention relates to web feed means for use with a high speed machine and more particularly to such apl. paratus in which the forces acting on portions of the advancing web are utilized in the control of the storage and feed of the web as it is being fed to a high speed machine In recognition of the necessity for coordinating the supply rate of a web to a utilization device in accordance with variations in the demand rate of the utilization device, numerous arrangements have hitherto been proposed for controlling the feed of the web to the utilization device. Such arrangements with which I am familiar have left much to be desired particularly due to the presence of undesirable inertial effects of parts operating intermit- A principal object of the present invention is, therefore, to provide a web feed and storage apparatus which is highly compact, in which the web is maintained under a substantially constant tension and characterized by substantial minimization or avoidance of inertial effects which would disturb the desired constant web tension.

A feature of the present invention is the provision of low inertia means for applying a force to a web so that under the influence of said force, it is withdrawn from a source of web supply to maintain an accumulation of the web under a substantially uniform tension in advance of In a preferred embodiment suction means are utilized to create unequal forces on two longitudinally spaced portions of the web at each of which an accumulation of t the web is normally maintained as it passes from supply means to the utilization device. The smaller force acts on the accumulation of the first portion of the web and differential in the forces acting on the two accumulations results in the first accumulation being depleted before the second accumulation, the latter being nearer to the utilization device. When the utilization device with- .draws the Web at a rate greater than the rate at which the smaller force acting on the Web causes its withdrawal from the supply means, the first accumulation is depleted first. Means are provided for increasing the rate of withdrawal from the supply means in response to depletion of Further advantages of the present invention will be apparent from the following description thereof and the accompanying drawing, the single figure of which is a diagrammatic and schematic representation of a preferred In the drawing there is shown a web such as paper from a supply reel 12 being fed to a machine such as a ,printing press, represented by printing rolls 14, 16. To compensate for variations between the speed of the Web leaving the supply roll and the speed of the web entering theprinting press, storage space is provided for a supply fof-paper atall times in a storage tank 18 between'the supply roll and the press. In an embodiment that is especiallywell suitedfor use in connection with a high speed, automatic card printing press, the storage tank isa rectangular box approximately 3% by 10 by 40 inches, and open at the top. The box is divided into two storage or accumulator compartments by a vertical partition 19 parallel to the greatest dimension of the tank. In the drawing the storage compartments are designated 20 and 22 respectively. The bottom of each of the compartments 20, 22 is formed by perforated semi-cylindrical guides, 24 and 26 respectively. The portion of the tank interior below the guides 24, 26 is a vacuum compartment 28 which is connected by a conduit 30 with a vacuum pump 32. The cross-sectional areas of the compartments 20, 22 are made unequal, the compartment 22 being wider than the compartment 20 so that the force exerted downward (as viewed) on the web by the vacuum in the compartment 22 is greater than that exerted in the compartment 20, to facilitate control of the web as will appear more fully hereinbelow. In the embodiment hereinabove mentioned the ratio of the widths of the compartments is approximately three to two. At the top of the tank 18 are mounted a driven roll 34 and idler rolls 36, 38 located respectively at the edge nearest the supply roll 12, at the partition 19, and at the edge nearest the press. The web from the supply roll 12 passes over the roll 34, loops down into the compartment 20 to form a first accumulation, passes over the idler roll 36, loops down into the compartment 22 to form a second accumulation, passes over the idler roll 38, and thence to the press. Near the bottom of the compartment 20, a lamp 40 is arranged to send a beam, as through a lens or window 42 in the wall of compartment 20 nearest the supply roll. The beam is arranged to impinge upon a photo-electric cell 44, which cell is preferably embedded in the partition wall 19. When the loop 46 of the web falls close to the bottom of compartment 20, the loop 46 interrupts the light beam.

The loop 48 of web in the compartment 22 is intended at all times to extend entirely to the bottom of the compartment 22 where it is held in slidable contact with the perforated guide 26 by the force resulting from the pull of the vacuum which is, as hereinabove mentioned, greater than the force in the compartment 20, inasmuch as the same vacuum acts over a larger area of the web in compartment 22 than in compartment 20. Whenever the web is drawn into the press at a faster rate than it is leaving the supply roll, the greater force holds loop 48 down while the loop 46 rises upward in the compartment 20, uncovering the light beam if the loop is not already above the level of the beam. As will be more fully explained hereinbelow, the uncovering of the light beam resulting from depletion of the web accumulation in compartment 20 actuates a mechanism for increasing the speed at which the web leaves the supply reel.

The press is driven by motor 68 which, together with a retarded relay 74 connected in series therewith, is connected in circuit with a suitable source when start switch 69 is closed.

Normally when the press is started up into operation from a standstill the web loops 46, 48 both are extended to the bottom of their respective compartments, providing in the embodiment hereinabove described a reserve supply of about fourteen linear feet of paper. When the press is started it is permitted to accelerate to full speed without motor control because the storage tank contains a suflic'ient supply of paper at an essentially uniform low tension suitable for feeding into the press. This tension is governed by the pull of the vacuum upon the web loop 46 in compartment 20. It will be noted that in the event the rate at which paper is withdrawn by the press exceeds the rate of infeed from supply reel 12, then the differential in the forces acting on the loops in compartments 20 and 22 results in the length of the loop in compartment 22 being maintained at the expense of the loop in compartment 20. Thus, the press in effect withdraws paper from the accumulation in compartment 20 which is the compartment nearest the supply reel.

A power-driven roll 50 is provided between the driven roll 34 and the supply reel 12 and is driven as by an electric motor 52, which motor may be designated the accelerator motor. Rotatably mounted above the roll 50 is a pressure roll 54 which may be used to press the paper against the driven roll 50 under the control of a solenoid A relay 58 connected in series with photocell 44 and its source, battery 60, is provided for controlling, by means of its contacts 70, the supply of current to the accelerator motor 52 from a suitable source. The accelerator means just described functions during the start up cycle of the apparatus and is not required during normal operation. To this end, contacts 79 and 71 of relay 58. are connected in series with the motor 52 and the solenoid 56, respectively. Normally closed contacts 75 of retarded relay 74 are connected in series with the winding of relay 58 and in parallel with the holding contacts 59] of relay 58. The delay of retarded relay 74 is sufficiently long so that its contacts 75 remain closed followthe closing of switch 69 for a time interval long enough for the press to withdraw web from compartment 2 and uncover the light beam from lamp 40. Photocell 44 now becomes conductive and relay 58 picks up its contacts 59, 70 and 71. Now when relay 74 drops out at the .end of its delay period relay 58 remains energized through its holding contacts 59 so long as the photocell 44 is illuminated by the light beam from lamp 40, thereby keeping the circuits to accelerator motor 52 and solenoid 56 closed. The accelerator means functions to bring the supply reel up to speed with a somewhat slower rate of acceleration than the rate of acceleration of the press. The initial operation of the press tends to deplete the accumulation in compartment 20 but the Web is rapidly restored in compartment 20 due to the operation of the accelerator.

A magnetic drag-brake 64 is located adjacent to the hub of reel 12, the energization circuit of which is also {controlled by photocell 44 so when lamp 40 is uncovered and photocell 44 is energized, the brake 64 is released.

" During the start cycle, as soon as the light beam is uncovered by the rise of the web loop, the electric circhit is established through the photo-electric cell 44 and the battery 60 actuating the solenoid 56 and the relay 58, thereby drawing the pressure roll 54 down upon the web and starting the accelerator motor 52. At the same time magnetic brake 64 is released. The supply reel is then brought quickly up to a speed at which it is capable of putting paper into the storage tank at a faster rate than it is withdrawn by the press running at full speed. This causes the loop 46 to descend until it blocks the light beam thereby causing the pressure roll solenoid 56 to release, the accelerator motor 52 to be shut down and the magnetic brake 64 to retard rotation of supply reel 12.

When the press is running normally, the paper is drawn from the supply reel, rotation of which is now retarded by brake 64, by the action of the vacuum upon the loop 46. Stabilization is eifected by means of the roll 34 which is driven from motor 68 as is the press and at a speed which is faster than the demand speed of the press. In the embdoiment that has been operated, the roll 34 is driven at about four percent above the web demand speed of the press. The speed of the roll 34 follows proportionately all speed variations of the press in every phase of press operation. The web is maintained taut against the roll 34 by means of the vacuum in compartment 20. The web is continually in sliding engagement with the face of driven roll 34, the rate of revolution of which is independent of the speed at which the web travels. Consequently, when the rate of travel of the web over roll 34 changes as brake 64 .is successively energized and deenergized, the web is not affected by the inertia of roll 34 as would be the case if roll 34 were an idler. Thus, the rail 34 acts as a dynamic stabilizer on the web.

The present apparatus is especially well suited for use with an automatic splicer whereby the operation of the press is not interrupted when the supply reel is replenished due to the presence of the accumulation of webin the tank 18. Such an automatic splicer splices the end of one reel of paper to the beginning of a new reel. This operation may be made very rapid, requiring perhaps no more than one-tenth of a second for its completion. During the splicing operation, the web from the reel is cut and stopped, during which time the press draws paper from the storage tank against the force resulting from the vacuum provided by the air pressure means which includes vacuum pump 32. Upon completion of splicing, contacts, not shown, also in parallel with contacts 59 of relay 58 are momentarily closed to complete the energizing circuit of relay 58 which then closes its contacts 59 and 70 and accelerator motor 52 is energized until the beam from lamp .40 is once again blocked. The new reel is accelerated to full speed as hereinabove described and the storage tank is refilled in the same manner as hereinabove described in connection with starting the press. "The proportions of the storage tank may be varied within wide limits while still remaining within the scope of the invention. Also it will be evident that the invention is not limited to use with a. printing press but may be used in connection with other machines and processes which operate upon material in the form of a web. Materials other than paper may constitute the web, and other controls, such as hydraulic or pneumatic controls, may be used where electric or electronic controls are shown.

The terms and expressions which have been employed are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions of excluding any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the invention claimed.

What is claimed is:

1. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device, means defining a path for said web and forming a compartment, means communicating with said compartment for maintaining an air pressure diifer' ential across said web to thereby apply a force to said web and withdraw it from the source thereof and maintain a web accumulation in said compartment, control means responsive to the accumulation of web in said compartment, and means governed by said control means for normally retarding withdrawal of the web from its source while the web is moving under the influence of said force from its source to said compartment, said control means in response to depletion of the accumulation of the web causing said means governed thereby to reduce its retarding elfect upon the withdrawal of the web from its source.

2. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device, means defining a path for said web and forming a compartment, means communicating with said compartment for maintaining an air pressure difierential across said web to thereby apply a force to said web and withdraw it from the source thereof and maintain a web accumulation in said compartment, control means responsive to the accumulation of web in said compartment, means governed by said control means for normally retarding withdrawal of the web from its source while the web is moving under the influence of said force from its source to said compartment, said control means in response to depletion of the accumulation of the web causing said means governed thereby to reduce its retard: ing effect upon the withdrawal of the web from its source, and accelerating means adapted to be energized u s se HR at t e util zetiaa d vi a accelerating df awalbf the web from its source, said control m eans upon restoration of the web accumulation being adapted to deenergize said accelerator means.

3. An apparatus as set forth in claim 2, comprising means for preventing reenergization of said accelerator means following deenergization thereof by said control means during continued operation of said utilization device.

4. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device, means defining a path for said web and forming a compartment, a roll on the infeed side of said compartment, means for continuously rotating said roll at a speed having a predetermined relation to the speed of operation of the utilization device, means com municating with said compartment for maintaining an air pressure differential across said web to thereby apply a force to said web and withdraw it from the source thereof and maintain a web accumulation in said compartment, said force maintaining said web taut against said roll, control means responsive to the accumulation of web in said compartment, and means governed by said control means for normally retarding withdrawal of the moving web from its source, said control means in response to depletion of the accumulation of the web causing said means governed thereby to reduce its retarding effect upon the withdrawal of the web from its source.

5. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device having a variable web demand rate, first means for receiving a web on one side thereof and accumulating a first portion of said web, second means on the other side of said first means for receiving said web from said first means and accumulating a second portion of said Web, said first and second portions of said web being spaced in that sequence longitudinally along the web in the direction it advances toward the utilization device, and means for maintaining a first and second force on said first and second portions respectively of said web in a direction to oppose depletion of the web accumulations, said second force being greater than said first force,- said first force serving to withdraw the web from the source thereof, whereby on the occurrence of an increase in the demand rate of said utilization device the first accumulated web portion is depleted before the start of depletion of the second accumulated web portion.

6. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device having a variable web demand rate, first means for receiving a web on one side thereof and accumulating a first portion of said web, second means on the other side of said first means for receiving said web from said first means and accumulating a second portion of said web, said first and second portions of said web being spaced in that sequence longitudinally along the web in the direction it advances toward the utilization'device, and air pressure means for maintaining a first and second force on said first and second portions respectively of said web in a direction to oppose depletion of the Web accumulations, said second force being greater than said first force, said first force serving to withdraw the Web from the source thereof, whereby on the occurrence of an increase in the demand rate of said utilization device the first accumulated web portion is depleted before the start of depletion of the second accumulated web portion.

7. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device having a variable web demand rate, first means for receiving a web on one side thereof and accumulating a first portion of said web, second means on the other side of said first means for receiving said web from said first means and accumulating a second portion of said web, said first and second portions of said web being spaced in that sequence longitudinally along tion device, and means including a vacuum pump communicating with said web portions for maintaining a first and second force on said first and second portions respectively of said web in a direction to oppose depletion of the web accumulations, said second force being greater than said first force, said first force serving to withdraw the web from the source thereof, whereby on the occurrence of an increase in the demand rate of said utilization device the first accumulated web portion is depleted before the start of depletion of the second accumulated web portion.

8. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device having a variable web demand rate, first means for receiving a web on one side thereof and accumulating a first portion of said web, second means on the other side of said first means for receiving said web from said first means and accumulating a second portion of said web, said first and second portions of said web being spaced in that sequence longitudinally along the Web in the direction it advances toward the utilization device, means including a vacuum pump communieating with said web portions for maintaining a first and second force on said first and second portions respectively of said web in a direction to oppose depletion of the web accumulations, said second force being greater than said first force, said first force serving to withdraw the web from the source thereof, whereby on the occurrence of an increase in the demand rate of said utilization device the first accumulated web portion is depleted before the start of depletion of the second accumulated web portion, control means responsive to said first accumulated portion of said web, and means governed by said control means for controlling the rate of withdrawal of said web from its source.

9. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device having a variable web demand rate,

first means for receiving a web on one side thereof and accumulating a first portion of said Web, second means on the other side of said first means for receiving said web from said first means and accumulating a second portion of said web, said first and second portions of said web being spaced in that sequence longitudinally along the web in the direction it advances toward the utilization device, means including a vacuum pump cornmunicating with said web portions for maintaining a first and second force on said first and second portions re spectively of said web in a direction to oppose deplepletion of the web accumulations, said second force being greater than said first force, said first force serving to withdraw the web from the source thereof, whereby on the occurrence of an increase in the demand rate of said utilization device the first accumulated web portion is depleted before the start of depletion of the second accumulated web portion, control means responsive to said first accumulated web portion, means governed by said control means for normally retarding withdrawal of the web from its source while the web is moving under the influence of said first force from its source to said first means, said control means in response to depletion of said first accumulated web portion causing said means governed thereby to reduce its retarding effect upon the withdrawal of the web from its source, and accelerating means adapted to be energized upon start up of the utilization device and for accelerating withdrawal of the web from its source, said control means upon restoration of said first accumulated web portion being adapted to deenergize said accelerator means.

10. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device, means defining a path for said web and forming first and second compartments each.-

adentesi tn receive rsanestivl r a a d s c d web accumulation with the cross-sectional area of the accumulation in said second compartment being greater than that of the aflcumulation in said first compartment, perforate web guide members supported in said compartments, vacuum pump means communicating with each of said comparunents on one side of said web through said guide members for maintaining an air pressure differential across each of said accumulations and thereby create forces urging said web into said compartments toward said guide members for maintaining said accumulations with the force acting on said second accumulation greater than that acting on said first accumulation, a roll on the infced side of said first compartment, means adapted for response to the speed of operation of said utilization device for continuously driving said roll, the force acting on said first accumulation maintaining said web taut against said roll and serving to withdraw the web from its source, control means resppnsive to depletion of said first accumulation and withdrawal of said web away from said guide member in said first compartment, means governed by said control means for normally retarding withdrawal of the web from its source while the web continues to move from its source to said first means, said control means in resppnse to depletion of said first accumulation causing said governed means to reduce its retarding eflect upon the withdrawal of the web from its source, accelerator means for accelerating withdrawal of the web from its source, and means controlling energization of said accelerator means, said control means upon restoration of said first accumulation being adapted to deenergize said accelerator means.

11. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device, means defining a path for said web and forming a compartment, means communicating with said compartment for maintaining an air pressure difierent-ial across said web to thereby apply a force to said web and withdraw it from the source thereof and maintain a web accumulation in said compartment, control means responsive to the accumulation of Web in said compartment, means governed by said control means for normally retarding withdrawal of the web from its source while the web is moving under the influence of said force from its source to said compartment, said control means in response to depletion of the accumulation of the web causing said means governed thereby to reduce its retarding effect upon the withdrawal of the Web from its source, accelerator means for accelerating withdrawal of the web from its source, and means controlling energization of said accelerator means, said contIOl means upon restoration of the web accumulation being adapted to deenergize said accelerator means.

12. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device, means defining a path for said web and forming a compartment, 21 roll on the infeed side of Said compartment, means for continuously rotating said roll at a speed having a predetermined relation t9 the speed of operation of the utilization device and which is greater than the web demand rate of said gmi! zation device, means communicating with said compactment for maintaining an air pressure differential across said web to thereby apply a force to said web and withdraw it from the source thereof and maintain a web accumulation in said compartment, said force maintaining said web taut against and in sliding engagement with said roll, control means responsive to the accumulation of web in said compartment, and means governed by said control means for normally retarding withdrawal of the moving Web from its source, said control means in response to depletion of the accumulation of the web causing said means governed thereby to reduce its retarding effect upon the withdrawal of the web from its source.

13. In an apparatus for supplying continuous web under substantially uniform tension from a source thereof to a utilization device, means defining a path for said web and forming first and second compartments each adapted to receive respectively a first and second web accumulation with the cross-sectional area of the accumulation in said second compartment being greater than that of the accumulation in said first compartment, perforate web guide members supported in said compartments, vacuum pump means communicating with each of said compartments on one side of said web through said guide members for maintaining an air pressure differential across each of said accumulations and thereby create forces urging said web into said compartments toward said guide members for maintaining said accumulations with the force acting on said second accumulation greater than that acting on said first accumulation, a roll on the infeed side of said first compartment, means adapted for response to the speed of operation of said utilization device for continuously driving said roll at a peripheral speed greater than the web demand rate of said utilization device, the force acting on said first accumulation maintaining said web taut against and in sliding engagement with said roll and serving to withdraw the web from its source, control means responsive to depletion of said first accumulation and withdrawal of said web away from said guide member in said first compartment, means governed by said control means for normally retarding withdrawal of the web from its source while the web continues to move from its source to the first said means, said control means in response to depletion of said first accumulation causing said governed means to reduce its retarding effect upon the withdrawal of the web from its source, accelerator means for accelerating withdrawal of the web from its source, and means controlling energization of said accelerator means, said control means upon restoration of said first accumulation being adapted to deenergize said accelerator means.

References Cited in the file of this patent UNITED STATES PATENTS 2,147,421 Bendz Feb. 14, 1939 2,831,678 MacNeill Apr. 22, 1958 FOREIGN PATENTS 480,223 Canada Ian. 15, 1952

Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3016207 *Dec 15, 1958Jan 9, 1962Potter Instrument Co IncVacuum loop tape handler
US3310249 *Apr 27, 1964Mar 21, 1967AmpexLoop fault sensing means for web transport systems
US3379352 *Mar 21, 1966Apr 23, 1968Burroughs CorpVacuum system for multiple station tape handling apparatus
US3464610 *Nov 17, 1966Sep 2, 1969Mohawk Data Sciences CorpFan-folded paper stacker
US3592133 *Nov 12, 1968Jul 13, 1971Harris Intertype CorpPrinting apparatus
US3723981 *Jul 17, 1962Mar 27, 1973Honeywell Inf SystemsPneumatic accessing of tape bands
US4941606 *Dec 4, 1989Jul 17, 1990Eastman Kodak CompanyDevice to stabilize a notched web in a vacuum box
US5010816 *Nov 10, 1988Apr 30, 1991Sarda Jean ClaudeWeb tensioning device for printing press
US5154037 *Feb 1, 1991Oct 13, 1992Focke & Co.Process and apparatus of feeding a web of material to a processing machine, especially a packaging machine
USRE30422 *Jan 9, 1979Oct 21, 1980Benson-FranceGraphic recorder
DE2825102A1 *Jun 8, 1978Dec 13, 1979Avery Maschinen GmbhVorschubvorrichtung fuer eine etiketten- traegerbahn
DE2848134A1 *Nov 6, 1978Oct 4, 1979Fobelmac SprlVerfahren und vorrichtung zum foerdern und kontinuierlichen bearbeiten eines biegsamen, deformierbaren aufzeichnungstraegers in bandform
DE3009325A1 *Mar 11, 1980Sep 17, 1981Vits Maschinenbau GmbhSchwebewalze in einer vorrichtung zum behandeln von warenbahnen mit empfindlicher oberflaeche
DE4003192A1 *Feb 3, 1990Aug 8, 1991Focke & CoVerfahren und vorrichtung zur zufuehrung einer materialbahn zu einer ver- bzw. bearbeitungsmaschine, insbesondere verpackungsmaschine
EP0006179A1 *Jun 5, 1979Jan 9, 1980AVERY MASCHINEN G.m.b.H.Advancing device for a label backing strip
Classifications
U.S. Classification226/38, 226/97.2, 101/228
International ClassificationD06C3/00, B65H23/00, B65H23/04, B65H20/24
Cooperative ClassificationD06C2700/10, B65H2408/215, B65H23/042, B65H20/24, D06C3/00, B65H23/00
European ClassificationD06C3/00, B65H20/24, B65H23/04A, B65H23/00