JPS61206752A - Automatic paper feeding device - Google Patents

Abstract

PURPOSE:To enable sheets to be positively separated one by one by allowing the sheet contacting section of a sheet stopper to be made of a contacting material with a high frictional coefficient where the stopper prevents a group of sheets with exception of one sheet from being transferred while the stopper comes in contact with the group of sheets. CONSTITUTION:A part of sheet groups is transferred to the position of a separat ing roller 26 passing through underneath a slit plate 23 where the lowermost sheet S1 is handled to be separated, and is transferred to No.2 transfer roller 30 by means of a separating belt 25. In this case, a sheet stopper 29 is in No.1 position which does not interfere the transfer of the sheet. Subsequently, a link 27A and 27B is pulled by a solenoid 28 allowing the pressure contact by the separating roller 26 to be released. Simultaneously, the tip end 29A of the sheet stopper 29 is rotated clockwise while it is pushed by the side of the swing ing link 27A allowing the tip end to move to No.2 position. Under this condition, the lower side of the sheet stopper 29 holds the top end of following sheet groups other than the sheet S1 preventing the sheet groups from passing through underneath the separating roller 26.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a paper conveying device, and more particularly, to a processing device that processes a sheet of paper by keeping it horizontally stationary at a predetermined position. The present invention relates to a device that conveys paper to a predetermined position.

[Conventional technology]

Generally, when making multiple copies of a document consisting of multiple sheets of copy paper or manuscript paper (hereinafter referred to as sheets), first, place the first sheet on the document table and copy a predetermined number of copies, then copy the first sheet. In place of the second sheet, a second sheet is placed on the document table and a predetermined number of copies are made, and in the same manner, all the sheets are sequentially placed one by one on the document table and a predetermined number of copies are made. On the other hand, separate the copies containing the first sheet into separate locations one by one, stack the copies containing the second sheet on top of them one by one, and repeat all copies in the same way. Although it is common practice to make multiple copies of a plurality of documents by stacking each copy one after another, such work is extremely complicated and time-consuming. For this reason, sorters (automatic sorting devices) have been commercialized as devices that automatically sort the copies one by one, but sorters require a large amount of space to sort 20 or 30 or more copies. This was indispensable, and moreover, it was time-consuming to take out the sorted documents one by one from their respective stacking positions. Recently, when stacking documents consisting of multiple sheets and setting them, the first sheet is first conveyed onto the document table, one copy is made, and then returned to the original document stack position. Then, transport the second sheet of paper onto the manuscript table, copy only one copy, and then return it to the original document stacking position.In the same manner, copy all the sheets one copy at a time, and then return to the original document stacking position. For example, there is a device that makes only one copy of a document consisting of the entire number of sheets by resetting it, and then repeats the above operation to make a predetermined number of copies of the document.
Publication No. 6, Japanese Utility Model Publication No. 51-55445 and its full text specification, Japanese Patent Publication No. 55-27343, Japanese Patent Publication No. 1983
Various proposals have been made in Publication No.-37536 and the like. However, in this type of device, the following items must be carried out reliably. In other words, (1) To reliably separate sheets one by one from a stack of documents and send them out. This is because if two or more sheets are fed multiple times, some copies of the document will be missing. (2) Place the sheet separated from the document in a designated area on the document table.
Correctly convey the material to a. This is because if the sheet is not placed in the correct position on the document table, it will not be possible to copy correctly, and parts of the document may be missing or
This is because a slanted copy may be created. (3) Each sheet of the document must not be damaged, such as wrinkles or tears. This is especially important when there is no backup of the manuscript. (4) Correctly return the copied sheet to its original document stacking position. This is because if the paper is not correctly returned to its original document stack position, it will interfere with subsequent copy preparation. (5) Regardless of the size or thickness of the sheets to be copied, each operation such as conveyance, copying, and return to the original stacking position must be performed reliably. This is because sheets constituting a document may include sheets of different sizes and thicknesses. Of the above matters, especially regarding (1), the sheet (
2. Description of the Related Art Various devices have been proposed in the past for reliably separating sheets of paper (original documents or sheets for copying) one by one. In FIG. 8, (a) is a mechanism that presses the separation member 2 against the delivery row 21 and sends out the sheets S, which have been conveyed to the separation section by the conveyance roller 3, one by one starting from the bottom layer. (b) uses a reversing roller 11 instead of the separating member 2 of (a) above. In (c), a reversing belt 12 is used in place of the reversing roller 11 in (b). (cl) connects the reversing roller 13 to the two delivery rollers I
It is arranged between A and IB, has a predetermined overlap amount d, and performs a separation operation by utilizing the rigidity of S. In any of the above cases, when the coefficient of friction of each member is taken as follows, the material of each member is selected so that the relationship shown below is established, and a predetermined separation function is performed. The coefficient of friction between the sending member (1) and the sheet) 3 is 2 μ9. The coefficient of friction between the separating member (2, lL12.13) and the sheet) 3 is 2 μB. The coefficient of friction between the upper and lower surfaces of the sheets is 2 μ. μ 〉 μ 〉 μ 8 BC

[Problems to be solved by the invention]

With 5DF (manual document feeder) and ADF (automatic document feeder), the document is separated only once, but with RDF (circulating automatic document feeder), the document is separated many times. The following problem occurs because the separation operation is performed using (1) Since the separating member is in a worn state at time t, the surface of the document is worn out during the separating operation. In particular, when the original document is a pencil original, when the original document is fed in the direction of the arrow in FIG. 9(a), the separation member is pressed against the original. The surface of the manuscript gets scratched, causing smudges or smudges on the pencil writing, or causing the pencil writing to become stale. (2) Since one of the separation members is in a fixed state or constantly rotates in reverse during the separation operation, the leading edge of the document tray may collide with the fixed separation member when entering the separation section; If a force is applied in the opposite direction to the transport direction, the
As shown in b), folds and wrinkles occur at the leading edge of the original document, and if it is too tight, it may tear.

[Means for Solving the Problems] The present invention eliminates the above-mentioned drawbacks of the prior art, which cause scratches on the sheet surface of originals, copy paper, etc., and folding and damage of the leading edge of the sheet. To provide a paper conveyance device that reliably separates and sends out sheets one by one without any problems. Furthermore, another object of the invention is to achieve the above-mentioned operations in a compact configuration. The automatic sheet feeder of the present invention that achieves the above object is an automatic sheet feeder that feeds a single sheet by frictionally separating sheets to be fed one by one stacked on a sheet loading table. In a paper device, a separation device includes a friction member that separates and transports sheets and another friction member that is pressed against and in contact with the friction member, a sheet transport member that transports one sheet after separation, and the separation device. It consists of a sheet stopping member that comes into contact with a group of sheets other than one sheet being conveyed in response to the movement and stops the progress of the sheet, and the part of the sheet stopping member that comes into contact with the sheet is formed of a contact member with a large coefficient of friction. It is characterized by the fact that EXAMPLES The present invention will be described in detail below with reference to illustrated examples. FIG. 2 shows an automatic document handling device to which the automatic paper feeder according to the present invention is applied. ing. First paper feed rollers 22A and 22B are provided on the right side of the set table 21 in the drawing. There is a slit plate 23 at the right end of this set table. In the figure, 20 is a separation device. An enlarged view of the separation device 20 is shown in FIG. This separation device 20 includes a roller 24A. A separation belt 25 suspended between the separation belts 24B, a separation row 226 that presses against the separation belt 25, and a link 27A that presses and releases the separation rows 226. 27B, a solenoid 28 that provides drive to the link mechanism 27, a sheet stop member 29, and a second paper feed driven roller 30.
．． 31 and a guide plate 32. In front of the guide plate 32, there is a plate arranged on the document table 50 of the copying device.
A conveyor belt 34 stretched between rollers 33, 33 is provided. A stop member 40 is provided at the left end in the figure of the document table 50 at a predetermined copying position, and furthermore, a stop member 40 is provided at the left end in the figure at a predetermined copying position.
8A and 36B are provided. A sheet receiving plate 37 is fixed to one end of the paper discharge guide 35, and a paper aligning belt 39 rotated by rows 238A and 38B is provided to the right of the plate 37. A plurality of sheets S set in a stacked state on the setting table 21 between the end of the paper alignment source belt 39 and the abutment plate 23 is connected to the first paper feed roller 22A. 22B, several sheets of the lower layer reach the slit plate 23 and pass through the lower gap to the separation device 20.
Move up to. Here, the sheet s is subjected to a flapping operation by the separating device 20 to separate only the lowest layer sheet SI, which is then conveyed by the separating belt 25 and reaches the second paper feed rows 230, 31, 32 to a conveyor belt 34, and thereafter the sheet is conveyed by the conveyor belt 34 over the document table 5o until the leading edge of the sheet reaches a stop member 40. Then, in this state, only one copy is made, and when the copying is completed, the stop member 4o is released and the sheet s is copied. The conveyor belt 34 conveys the paper along the ID 35 to the paper discharge rows 236A and 36B, and then to the paper discharge roller 36A. 36B leads to the paper alignment belt 39, and the paper alignment belt 3
9, it is returned to the top of the sheet S on the set table 21. Then, in the same manner as described above, only one sheet S, which was the second sheet from the bottom, is separated from the lowest position, fed, conveyed, and stopped at a predetermined position by the stop member 40. When only one copy is copied, the stop by the stop member 40 is released, the sheet is conveyed again, the sheet is ejected, and the sheet S is returned to the top of the sheet S on the set table 21 at that time. Thereafter, in the same manner, all the originals on the sheet S are fed, transported, stopped, one copy is copied, and transported and discharged, and each time the original is returned to the top of the sheet S on the setting table 21, the sheet S
One copy of the sheet S consisting of all the copies of the sheets that make up the sheet S will be made, and if this is repeated as many times as necessary, a predetermined number of copies of the sheet S will be made. Become. Next, the movement of the separation device 20 will be explained with reference to FIGS. 3(a) and 3(b). f@3 Figures (a) and (b) are
S shows the operation of separating only the lower layer S1 from the empty layer. In FIG. 3(,), the sheet group is the first paper feed roller 22A,
22B in the direction of the separation device 20, and the tip is regulated by the slit plate 23 so that only a part of the lower layer is further fed. At this time, the separation row 226 is in a state in which the planter 28A of the solenoid 28 is extended and is in a state in which it is pressed against the separation belt 25 via the links 27A and 27B. A part of the sheet group passes under the slit plate 23 and is sent to the separation roller 26, where only the bottom sheet S1 is separated and separated, and the separation belt 2
5 to the second paper feed roller 30. At this time, the sheet stop member 29 is in the first position where it does not interfere with sheet conveyance, as shown in the figure. In FIG. 3(b), the solenoid 28 is the link 27A. By pulling 27B, the pressure on the separation roller 26 is released. At the same time, the tip end 29A of the sheet stop member 29 is
Pushed by the side surface of the swinging link 27A, it rotates clockwise as shown, moves to the second position, and stops. In this second position, the lower end surface 29B of the sheet stop member 29 is
As shown in FIG. In this state, the leading edge of the sheet group is held down to prevent it from passing under the separation roller 226. In this state, the leading edge of the sheet group is held between the second paper feed rollers 30, and the sheet is transferred to the second paper feed by the conveyance force of the separation belt 25. The paper passes through the paper row 231 and is further sent to the conveyor belt 34 on the document table 50.
) is a perspective view of the slit plate 23 in the state shown in FIG. (The slit plate 23 is omitted.) In the present invention, FIGS.
As shown in the figure, an elastic member R1 having a large friction coefficient is provided at the tip of the sheet stop member 29, for example, a urethane rubber member, a silicone rubber member, a chloroprene rubber member, a fluororubber member, or the like. The leading ends of some of the sheets other than the one sheet S1 to be conveyed come into contact with the surface of the elastic member Rf) 111, and the forward movement of the sheets is reliably prevented by the coefficient of friction. Even if two or more sheets pass through the pressure contact portion between the separating roller 26 and the separating belt 25, the elastic force at the tip of the sheet stopping member 29 from above the sheet can be removed while the sheet stopping member 29 is in the second position. By pressing the lower end surface of member R, double feeding of sheets can be prevented. A friction member such as urethane rubber or silicone rubber is used as the separation row 226, but it is a limited power that transmits the axial torque of the sleeve until the force applied to the roller surface reaches a certain value, and when it exceeds that value, it becomes free. A transmission means (so-called torque limiter) is preferable. The configuration of the torque limiter will be explained with reference to FIG. Separation row 2
26 is attached to a separation roller boss 62 that is rotatably fitted onto the separation roller shaft 61, and is located on one end surface side of the separation roller boss 62, so that a spring joint 63 connects to the separation row 2 shaft 61. It is fitted externally. One end of this spring joint intro 3 is connected to the separation row 2 port 61.
On the other hand, it is fixedly held by a fixedly attached spring support member 64, and the other end of the spring seat intro 3 has a cylindrical part 82a protruding from one end surface of the separation roller boss 62. It is configured to be fitted onto the outside while being tightened at its inner diameter. Then, the separation row 226 transfers the torque of the separation roller shaft 61 using the friction force between the inner diameter part of the spring seat intro 3 and the outer circumferential surface of the cylindrical part 62a of the separation row 2-boss 62, and transfers the torque to the separation roller post 6 on which it is attached.
2. As described above, since the pressure of the separation roller 26 is released during the separation operation, the separation roller 26 directly contacts the sheet surface only at the leading end. Specifically, Figure 3 (
In a), the length Q between the separation roller 26 and the second paper feed row 230 is limited, and this length is generally 10 to 20 m.
- It's about. Therefore, even if the sheet s is a stirrup manuscript, the wrinkles on the manuscript surface are limited to this range, and in most cases this part is generally a blank space, so it is extremely unlikely to be a problem in practice. Furthermore, when a torque limiter is used as the separation row 228, reliability is not only improved by returning the sheet S in the opposite direction, but also when a single sheet is used, it becomes free from the shaft 61 and the separation belt 25 Because it follows the direction of rotation of the sheet, it does not apply force in the opposite direction to the leading edge of the sheet, unlike when using a fixed separation member or reversing roller (belt). It disappears. Here, the function of the torque limiter will be explained with reference to FIGS. 6(a) and (b). When a torque limiter is used for the separation roller 26, it is common to apply rotational torque in a constant direction D2 to the shaft 61. FIG. 6(a) shows a case where the separation operation has been successfully performed and there is one sheet Sl between the separation row 226 and the separation belt 25. At this time, the friction coefficients of each member have the following relationship. Coefficient of friction between the separating belt 25 and the sheet S: μ^ Coefficient of friction between the separating roller 26 and the sheet S: 2 μB Coefficient of friction between the sheets S: 2 μ. μ > μ, μ > μ8 When CB, by setting the limit value of the torque limiter below the pongee torque generated based on the pressing force of the separation roller 26 and the friction coefficient μB, the separation roller 26 is the shaft 61
It becomes free between the two and rotates in the direction D1 of the arrow shown in the figure. As shown in FIG. 6(b), if the separation is insufficient and two sheets S+-82 are inserted between the separation row 226 and the separation belt 25, the friction between the sheets will increase. Since the coefficient μ is smaller than the friction coefficients μB and μ6 between the sheet S and the separation row 226 or between the sheet S and the separation belt 25, the torque of the pongee 61 is directly transmitted to the separation roller 26 and rotates in the direction D3. Therefore, the sea) S2 is returned in the opposite direction to the conveyance direction to prevent double feeding, and only the sea) S+ is sent. FIGS. 7(a) and 7(b) are perspective views of a separation device showing another embodiment of the present invention. The sheet stopping member 29 of the separation device is stopped and released by rotating around the rotation axis, but as shown in the figure, its vertical movement is controlled by using a solenoid 48 or the like.
': # as Virtue 1*-, L -ulI6v M Tuna Ah A
Figure 7 (a) shows the seat stop member 4
9 is raised and S indicates a release operation state in which passage is possible. At this time, the bent portion 49 of the sheet stop member 49
A comes into contact with the upper fixing plate 4 and reaches the upper stop position. Figure 7 (b) shows the stopping operation with the planter 48A of the solenoid 48 extended. As a result, the sheet stop member 49 is pushed down and presses against the outer peripheral surface of the separation belt 25. In this state, C)S is blocked from advancing and stops. In the above embodiments of the present invention, the copied sheet is returned to the original document stacking position, but the invention is not limited to this. For example, the copied sheet is returned to the original document stacking position. It goes without saying that the present invention can also be applied to an apparatus for transporting the present invention to a predetermined position other than the above, and can also be applied to a processing apparatus that performs appropriate processing other than copying.

【Effect of the invention】

As described above, according to the automatic sheet feeding device of the present invention, the sheet stopping member is in the retracted position while the separation member that prevents double feeding of fed seeds is in the operation of frictionally separating the seeds in a crimped state. When the frictional separation is released and the sheet is conveyed, it moves to the stop position that prevents the double feeding of subsequent sheets, which improves the reliability of the separation performance in bottom-feeding automatic sheet feeding, and prevents non-feeding. 9 Double feeding, image loss on the sheet surface, damage to the leading edge of the sheet, etc. can be prevented, and it is now possible to separate and feed a wider range of paper types than before.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an automatic paper feeder according to the present invention, and FIG. 2 is a sectional view of an automatic document handling device to which this automatic paper feeder is applied. 3(a) and 3(b) are diagrams for explaining the operation of the separation device, and FIG. 4 is a partial perspective view thereof. FIG. 5 is a perspective view of the torque limiter, and FIGS. 6(a) and 6(b) are diagrams for explaining the operation of the torque limiter. Figure 7(a),
(b) is a perspective view of a separation device showing another embodiment according to the present invention. FIG. 8 is a diagram illustrating various conventional separation devices. FIG. 9 is a diagram showing defects in sheets fed by a conventional separating device. 22A, 22B...First paper feed roller 23...
... Slit plates 24A, 24B ... Rollers 25 ... Separation belt (sheet conveyance belt) 26
... Separation rollers 27A, 27B ... Links 28.48 ... Solenoids 29.49 ... Sheet stop members 30.31 ...
...Second paper feed roller 32...Ide plate S, S,,S,...Sheet applicant: Konishiroku Photo Industry Co., Ltd. Fig. 7 (Fig. 7) b)

Claims (2)

[Claims] (1) A friction member that separates and conveys sheets in an automatic sheet feeding device that feeds sheets by frictionally separating sheets placed in a stack on a sheet stack one by one. and another friction member that presses against and separates the sheet, a sheet conveyance member that conveys one sheet after separation, and a group of sheets other than the one that is conveyed in response to the operation of the separation device. a sheet stopping member that comes into contact with the sheet to prevent the sheet from advancing, and a portion of the sheet stopping member that contacts the sheet is formed of a contact member having a large coefficient of friction. (2) The automatic paper feeder according to claim 1, wherein the elastic member is made of at least one material selected from polyurethane rubber, silicone rubber, chloroprene rubber, and fluororubber.