US 3891205 A
A paper feeder has a construction such that, while a sucker adapted to transfer individual sheets one by one from a stack of paper is in the process of lifting the uppermost sheet of paper from the top of the stack of paper stored in a paper magazine, air is blown against the sheets of paper adhering to the sucker so as to blow down any extra sheets entrained by the uppermost sheet being removed, whereby the individual sheets of paper are transferred one by one to a desired position without fail.
Description (OCR text may contain errors)
United States Patent Sunahara et al.
METHOD FOR PAPER FEEDING AND DEVICE THEREFOR Inventors: Hiroshi Sunahara, Seto; Yoshio Kimura, Kyoto. both of Japan Agency of Industrial Science & Technology, Japan Filed: Nov. 14, 1973 Appl. N0.: 415,800
Foreign Application Priority Data Nov. l5, 1972 Japan 47-l 14440 US. Cl 271/98; 27l/l Int. Cl B65h 3/08; B65h 3/48 Field of Search 271/98, 97, ll, l, 104. 27l/lO5, 90, 30
References Cited UNITED STATES PATENTS 4/1939 Long 27l/3O R X June 24, 1975 2.224.802 l2/l940 Spicss 27l/98 2.979.329 4/l96l Cunningham .r 271/98 3.199.863 8/l965 Miillcr 271/98 3.675.602 7/l972 Pircllo 27l/l X Primary Examiner-Even C. Blunk Assistant E.raminer-Bruce H. Stoner, Jr. Attorney, Agent, or Firm-Oblon, Fisher. Spivk, McClelland & Maier 5 7] ABSTRACT A paper feeder has a construction such that. while a sucker adapted to transfer individual sheets one by one from a stack of paper is in the process of lifting the uppermost sheet of paper from the top of the stack of paper stored in a paper magazine, air is blown against the sheets of paper adhering to the sucker so as to blow down any extra sheets entrained by the uppermost sheet being removed, whereby the individual sheets of paper are transferred one by one to a desired position without fail.
5 Claims, 4 Drawing Figures SHEET PATENTEDJun24 ms \4 I i I I Ill.
l "Ilii m METHOD FOR PAPER FEEDING AND DEVICE THEREFOR BACKGROUND OF THE INVENTION This invention relates to a method for automatically feeding sheets of filter paper. for example. as in an apparatus for the analysis of substances suspended in water and to a device therefor.
As a device for automatic feeding of paper. there has heretofore been known a suction type paper feeding device which utilizes the vacuum produced by a suction pump. This device has been adopted in large duplicators. Conventional paper feeding devices. however. are large and are complicated in mechanism and frequently allow two or three sheets of paper to be transferred all at once, causing an interruption of machine operation or other mechanical troubles.
A primary object of this invention is to provide a method for feeding individual sheets of paper of any kind and size safely one by one and a device for practic ing said method.
Another object of this invention is to provide a paper feeding device so small in size and simple in structure as to be readily incorporated, for example into a known automatic measuring system.
SUMMARY OF THE INVENTION To accomplish the aforementioned objects. the paper feeding device according to this invention comprises a magazine for storing a stack of paper, a sucker serving to draw up individual sheets of paper one by one from the stack of paper stored in said magazine, a means for blowing air against the paper clinging to said sucker. and a means for driving said sucker so as to transfer the drawn up paper to a required position. In the device of this construction, if the sucker happens to draw up two or more sheets of paper at a time. air of a prescribed pressure is blown against the paper now clinging to the sucker to blow down any extra sheets entrained by the uppermost sheet being transferred. enabling the individual sheets of paper to be transferred one by one to the required position.
Other objects and other characteristics of the present invention will become apparent from the further disclosure of this invention to be given herein below with reference to the accompanying drawings.
BRIEF EXPLANATION OF THE DRAWING FIG. 1 is a side view illustrating in outline one preferred embodiment of the paper feeding device according to this invention.
FIG. 2 is a top plan view of the embodiment shown in FIG. 1.
FIGS. 3 and 4 are cross-sectional views each illustrating a preferred embodiment of the mechanism of this invention for preventing the uppermost sheet of paper from entraining any extra sheets of paper while it is being transferred to said desired position.
DETAILED DESCRIPTION OF THE INVENTION The accompanying drawings illustrate preferred embodiments of this invention for application to an analytical system.
Referring to FIG. I and FIG. 2, a dry chamber 1 encases a magazine 2 which holds therein a stack of circular filter paper 6 to be fed. At the bottom of said dry chamber I, a suitable heating means 3 such as an electric bulb is disposed so as to keep the interior of said chamber at a constant temperature and prevent the stack of filter paper from getting moist. Above the magazine 2, there is disposed a sustainer 4 which is provided at the forward end thereof with a sucker 5 adapted to suck up the paper. Said sustainer 4 is secured to one end of an arm 7 the other end of which is fastened to a shaft 8. The shaft 8 is driven in a vertical direction by a vertical drive unit 9 and rotated by a rotary unit 10. The sucker 5 is connected to a pump P. so as to draw up the paper.
The magazine 2 is provided along the upper edge thereof with a ring-shaped tubular member [2 containing a plurality of orifices I3 for discharging air. This tubular member 12 serves to blow the air supplied from a pump P toward the center of said ring of tubular member [2.
The paper feeding device according to this invention has a construction as described above. First. the vertical drive unit 9 is set to motion to cause the sucker 5 to descend onto the top of the stack of filter paper 6 held within the magazine 2. The sucker 5 then sucks up the filter paper by virtue of vacuum produced by the pump P The sucker 5, with the paper clinging thereto,
is lifted. In this case, a spring member II disposed beneath the bottom of the stack of paper helps to ensure the suction of paper by the sucker 5. At this time. there is a possibility that the sucker 5 may draw up two or three sheets of filter paper at once. While the paper being lifted by the ascending sucker S is in the process of passing the ring-shaped tubular member [2, the air blown out of the orifices l3 blows down the extra sheets entrained by the uppermost sheet which is in direct contact with the sucker. To be specific, the ring of tubular member I2 has an inside diameter large enough to permit passage of the filter paper and is provided on the inside the reof with a plurality of suitably spaced orifices (three orifices in the illustrated embodiment) which serve to discharge the air supplied from the pump P toward the center of the ring of tubular member. When the air is discharged onto the periphery of the filter paper now clinging to the sucker S, the air pressure overcomes the attraction with which the sucker holds the second and following sheets across the uppermost sheet. with the result that such extra sheets are blown down onto the stack. The extra sheets blown down fall back into magazine 2 where they wait to be picked up in turn. The shape of said tubular member I2 may suitably be modified so as to conform to the shape of paper being handled.
In the aforementioned mechanism designed to prevent transfer of extra sheets. the ratio of the magnitude of suction by the pump P, to the magnitude of discharge by the pump P: is a critical factor. This ratio must be determined by taking into due consideration the shape and quality of the particular paper to be handled. In the ease of the illustrated embodiment. wherein the member 12 contains three air-discharge orifices. the filter paper weighs 0.2g per sheet and measures mm in diameter and the sucker has a sucking area of 13.3 mm", the desired effect is obtained by fixing the magnitude of suction through the sucker at Sl/min. and that of discharge through the orifices at ZOl/min, i.e.. at a ratio of l 4.
When the orifices are disposed slightly below the horizontal plane dividing the tubular member into two equal halves so that they are directed slantingly downward as illustrated in FIG. 3, then the air discharged therethrough can be introduced more easily between the uppermost sheet and other extra sheets entrained. facilitating the separation of such extra sheets from the uppermost sheet.
In a modified embodiment. the stack of paper held within the magazine 2 is mounted on a slightly inclined base 16 and the suction face of the sucker is also inclined by the same degree as said inclined base as illustrated in FIG. 4 so that the filter paper is sucked up by the sucker while still in the inclined position. in this case. the air discharged through the orifices is blown against the paper in an inclined direction with reference to the direction of the paper, facilitating the sepa ration of extra sheets from the uppermost sheet which is in direct contact with the sucker.
The mechanism of the construction described above thus causes the forced current of air to blow down extra sheets adhering to the uppermost sheet, so that only one sheet of paper is allowed to adhere to the sucker. The arm '7 having just one sheet of filter paper held fast by the sucker is revolved and brought to a position di rectly above a weighing plate 14 and then lowered until the filter paper comes into contact with the weighing plate 14 by means of the vertical drive unit 9. At this point, the suction pump P is stopped to allow the filter paper to alight on the weighing plate. The suction and the release of filter paper by the sucker may be effected by inserting a solenoid valve 15 in a pipe connecting the suction pump F and the sucker. which solenoid valve is opened and closed as required by means of a timer (not illustrated).
In the accompanying drawings are illustrated preferred embodiments utilizing the present invention for transfer of filter paper to a weighing plate in an analytical system. by way of example. Needless to mention, the present invention can be applied to a device for feeding wrapping paper in an automatic medicine packaging machine, to a device for feeding blank chart in a measuring machine. and so on.
This invention, as described above, enables the individual sheets ofa stack of paper to be transferred safely one by one by use of a very simple mechanism. The device of this invention. therefore, can be incorporated into any system involving the operation of paper feeding, enabling the operation of the system to be fully automated.
What we claim is:
l. A method for feeding paper stacked within a magazine comprising:
disposing a support means above said paper magazine;
moving said support means vertically downwardly by a reciprocable drive means; causing the uppermost sheet of paper of said paper stack stored in said magazine to be drawn vertically upwardly onto a sucker. supported upon said sup port means. by virtue of vacuum produced therein by a suction pump;
moving said support means and said sheet of paper vertically upwardly so as to remove said sheet of paper from said paper stack for transferring the same;
blowing air toward said sheet of paper in a peripheral manner from a fixed position disposed above said magazine as said support means and said sheet of paper passes said position during said vertical movement of said support means and said sheet of paper for thereby blowing down any extra sheets of paper entrained by said uppermost sheet held in direct contact with said sucker;
transferring said support means and said uppermost sheet of paper held fast on said sucker to a required position;
returning said support means to said position disposed above said magazine; and
repeating said method until said stack of paper is depletedw 2. A method according to claim I, wherein the air is blown in a horizontal direction against the paper drawn fast against the sucker.
3. A method according to claim I, wherein the air is blown in an downwardly inclined direction against the paper drawn fast against the sucker.
4. A device for feeding paper comprising in combina tion:
a magazine for storing a stack of paper;
a sucker disposed upon elongated support means and above said stack of paper. adapted to draw the uppermost sheet of paper of said paper stack vertically upwardly from said stack in said magazine as a result of vacuum produced within said sucker by means of a suction pump;
driving means for imparting vertical reciprocable motion to said elongated support means and said sucker sufficient to permit said support means and said sucker to reach the lowermost sheet of paper of said stack as well as to clear the upper portion of said magazine, and rotary motion when said sucker is clear of said magazine, as required; and
means fixedly disposed peripherally about and above said magazine for directing a forced current of air toward said uppermost sheet of paper drawn fast against said sucker thereby causing any extra sheets of paper entrained by said uppermost sheet to be blown down onto said stack of paper.
5. A device according to claim 4, wherein the stack of paper is stored in an inclined position and the sucking face of the sucker is inclined by the same angle as that of the stack of paper.