JPS63247258A - Automatic circulation feed device for original - Google Patents

Abstract

PURPOSE:To perform reliable truing of the forward ends of originals having various sizes, by a method wherein a slider, being slidable in an original feed direction, is situated on an original feed table, and an end plate, rockably supported to the slider, is provided. CONSTITUTION:Two slide rails 33, extended in parallel along the feed direction of an original 14, are situated on the surface of an original feed table 13, and a slider 34, being slidable and guided in a nipped state between the slide rails 33, is provided. A part of the slider 34 is notched in the shape of a rectangle, a lamellar end plate 35 is mounted on the notched part in a manner to be rockable centering around a fulcrum 35a, and is normally erected through energization of a twist spring 36. Absorbing plates 37 and 38 are positioned on the surfaces, making contact with each other in a fall state, of the back side of the end plate 35 and the slider 34, and maintain the the end plate even in a falling state. Thus, by sliding an end plate position according to the size of an original, truing of the forward ends of the originals can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an automatic document circulation feeding device for a copying machine.

BACKGROUND TECHNOLOGY Conventionally, in order to improve document processing efficiency, copying machines have been equipped with an automatic document circulation feeding device, so-called RAD, that automatically feeds and collects multiple sheets of document for multiple copies.
There is one with F.

In this type of RADF, friction is generally applied by a combination of a separation roller and a separation blade in order to separate and feed multiple sheets of originals stacked on a document supply table one by one starting from the lowest sheet. Separate paper feeding method is adopted.

In order to ensure copy quality, reliability of operation, etc., when a document that has been fed into a contact glass, etc. and has been copied is discharged and collected on the document supply table through the discharge path,
It is necessary to align the leading edge of the document for refeeding.

For this reason, an RAD with a paper feeding section as shown in FIG.
There is an F. First, the document supply table 2 on which the document is loaded and collected is installed with an inclination of, for example, about 30 degrees toward the direction in which the document 1 is fed.

On the supply side of the document supply table 2, there is a half-moon roller-shaped pickup roller 3 for feeding out the lowest paper side of the document l;
A pair of separation belts 4 and 5 having a high friction coefficient are provided to separate and convey only the lowest sheet of the document 1 fed by the pick-up roller 3. On the other hand, a pair of discharge rollers 6 are provided above the document supply table 2 for discharging and collecting the document 1 that has been fed and used for copying onto the document supply table 2 through the discharge conveyance path.

As a result, when the document 1 separated and fed from the document supply table 2 is ejected onto the document supply table 2 by the ejection roller 6, due to the inclination of the document supply table 2, its own weight causes the document 1 to reach the topmost position. The paper slides downward (on the supply side), and the leading edge of the document 1 can be aligned with the paper separation and feeding unit side. However, since it relies on its own weight which depends on the inclination angle of the document supply table 2, the alignment of the leading edge of the document with respect to the separation paper feed section is poor and uncertain, and the page order of the document l may be incorrectly fed. If you increase the inclination angle of the document supply table 2, it will be easier to align the leading edges of the documents, but if you increase the inclination angle too much,
The document 6 discharged by the discharge roller 6 may fall or curl onto the discharge roller 6, etc., and the appearance of the document supply table 2 is deteriorated. Further, even if the inclination angle is increased, the return of the original may be difficult due to static electricity or resistance between sheets of the original, so it is uncertain.

For this reason, as shown in FIG.
There is one in which an end plate 8, which is rotatable about a fulcrum 7 and formed in an abbreviated shape, is provided above the fulcrum. This is done by setting the end plate 8 in the state shown by the solid line in FIG. It faces toward the body and its tips are aligned.

However, such an end plate 8 can be used only when the document 1 is, for example, A4 vertical size, B5 vertical size, etc. If the document is larger than this, the end plate 8 can be used as an imaginary image in FIG. It is used by rotating it and laying it down as shown by the line. In other words, in the case of a large document, as described above, the leading edge of the document is aligned depending on its own weight based on the inclination angle of the document supply table 2, which is uncertain.

In the end, some conventional methods use the end plate 8 to improve the alignment of the leading edge of the document.
It cannot be used depending on the size of the original, and cannot be applied to all originals.

Purpose The present invention has been made in view of the above points, and is an automatic document system that can freely position the end plate according to the size of the document and improve the alignment of the edges of the document to be ejected and collected. The purpose is to obtain a circulating paper feeding device.

Structure In order to achieve the above-mentioned object, the present invention separates the originals stacked on the original feeding table inclined in the feeding direction one by one starting from the lowest sheet and feeds and transports them to the exposure position, and after exposure, the In an automatic document circulation feeding device that discharges and collects documents on the topmost document on a document supply table, a slider that can freely slide in the supply direction of the document is provided on the document supply table, and the slider is raised and lowered by a rotational fulcrum with respect to the slider. By providing an end plate that is rotatably supported and substantially perpendicular to the surface of the document supply table, and by providing a biasing member that biases the end plate in a substantially vertical upright direction, the end plate is positioned in accordance with the document size. By setting the end plate, the end plate can be used for all sizes of originals, and furthermore, if the end plate is set in the wrong position, the end plate will not collapse and cause problems. .

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. First, the schematic configuration and operation of RADFIO of this embodiment will be explained with reference to FIG. 4. Contact glass 12 on top of copying machine body 11
O is provided.

In this RADFIO, a document supply table 13 inclined at an angle of, for example, about 30 degrees is provided at the upper right side, and a plurality of documents 1
4 is configured to be stacked and set in page order with the original surface facing upward. A partition plate 15 is provided on a part of the document supply table 13 to separate the circulated and collected documents from the unfed documents on the document supply table 13 and can be rotated by a motor 16 and set on the uppermost sheet. It is set up like this. Further, on the supply side of the document supply table 13, there is a half-moon roller-shaped call roller 17.
Further, a separation roller 18 which also serves as a turn roller is provided at the lower end of the document supply table 13. A separation belt 19 is in opposing contact with the separation roller 18, and an entrance pawl 20 for controlling the paper feeding operation is provided so as to be openable and closable. As a result, the originals 14 stacked and set on the original supply table 13 are moved from the lowest paper price to the calling roller 17.
The paper begins to be fed by the separation roller 18 and separation belt 19.
One sheet of document 1 on the lowest sheet due to friction as it passes through the section
4 is separated and conveyed in a turn along the separation roller 18.

Here, a pair of pull-out rollers 21 are provided in the turn conveyance path by the separation roller 18, and the separated and fed document 14 is conveyed into the reversing path 22 by the pull-out rollers 21. This reversing path 22 is connected to the original supply table 13.
is formed at the bottom of the pair of reversing rollers 2.
It has 3.

This reversing portion roller 23 is capable of forward and reverse rotation, and after the document 14 is conveyed into the reversing path 22, it is reversely conveyed toward the contact glass 12 side by reversing the reversing portion roller 23. Due to such switchback paper feeding, the original 14 set with the original surface facing upward is converted so that the original surface is facing downward.

Immediately before facing the contact glass 12 side, a registration roller 24 is provided for adjusting the paper feeding timing.

Furthermore, a conveyor belt 27 supported by a driving roller 25 and a driven roller 26 is provided on the contact glass 12, and conveys the document 14 sent onto the contact glass 12 via the registration rollers 24. Uke will have it.

Here, the copying operation can be carried out in two modes: a mode in which the original 14 is conveyed by the conveyor belt 27 to a predetermined position on the contact glass 12 and stopped, and the optical scanner is scanned and moved to form a latent image; is fixed at a predetermined position, and the original 1 is transported by the conveyor belt 27.
It is possible to select a mode in which the latent images are sequentially formed while conveying the image forming apparatus 4 at a predetermined speed.

Next, on the driven roller 26 side, a discharge conveyance path 29 is formed which passes through a reversal path by a turn roller 28 and is located on the conveyance belt 27 and directed toward the document supply table 13 side.

A plurality of pairs of rollers are provided in the discharge conveyance path 29, and a pair of discharge rollers 30 are provided slightly above the document supply table 13 to discharge and discharge the document 14.

In this way, the RADF 10 is configured to have a circular conveyance path in which the originals 14 separated and fed from the original supply table 13 are discharged and collected back to the document supply table 13. Here,
The partition plate 15 indicates that one cycle of copying of some of the originals 14 set on the original supply table 13 has been completed.
operation is detected and paper feeding is resumed for the next cycle.

The structure of the document supply table 13 will now be explained with reference to FIGS. 1 to 3. First, the document supply table 3 is provided with a pair of side fences 31 and 32 for aligning the document 14 in the width direction according to the size of the document 14 to be set. In this example, the side fence 31 side is fixed and the partition plate 15
A notch 31a is formed therein, and the side fence 32 side is slidably movable. Also, the original supply table 13
On the surface, a slide rail 33 is formed parallel to the feeding direction of the original 14 and has a certain length on the upper end side. It is provided. Here, a part of this slider 34 is cut out in a rectangular shape,
A plate-shaped end plate 35 has a rotation fulcrum 3 within this notch.
5a so that it can be rotated up and down. and,
Such an end plate 35 is usually mounted on the document supply table 13.
A torsion spring 36, which serves as a biasing member and is kept upright substantially perpendicular to the surface of the paper, is pivotally supported by a rotation fulcrum 35a and is locked between the end plate 35 and the surface of the document supply table 13. Here, the biasing force due to this torsion spring 36 is P,
Then, this biasing force P is not so large. For example, if the ejection force of the document 14 to be ejected is B2, then B2>p.

The power relationship is set up as follows.

Further, adsorption plates 37 and 38 of a magnetic type or the like are provided on the back side of the end plate 35 and the slider 34 so as to be in contact with each other in a lying state, and are provided with adsorption plates 37 and 38 of a magnetic type or the like. It is also possible to maintain it.

Note that the surface of the member forming the guide rail 33 has an A3. B4. A size mark 39 is attached to indicate the set position of the end plate 35 according to the document size, such as A4, B5, etc.

In such a configuration, the size of the document 14 to be used (
position by sliding the end plate 35 (slider 34) using the size mark 39 as a guide. Under such settings, the document 14 is fed from the document supply table 13 and subjected to the copying operation, and then discharged onto the document supply table 13 by the ejection roller 29. As shown in the figure, it collides with the end plate 35 that stands vertically. As a result, the original 14
receives a repulsive force from the end plate 35, and is returned to the separation paper feeding unit side of the document supply table 13, where the separation roller 18, entrance claw 20, etc. are provided, as shown by the imaginary line in FIG. As a result, the leading edge of the retrieved original 14 is returned to the separation sheet feeding section, regardless of the inclination angle of the original supply table 13, so that the leading edges are aligned. Therefore, when paper is re-fed, troubles such as page order errors and non-feeding can be prevented. Since the set position of the end plate 35 can be freely set by sliding, it can be used for all original documents 14 of various sizes.

By the way, when focusing only on the repulsive force by the end plate 35, it is sufficient to always fix it in an upright state and allow it to slide freely, but sometimes the operator
It is also possible that the distance from the ejection roller 29 to the end plate 35 is shorter than the size (length) of the document due to an incorrect setting position. In this regard, according to this embodiment,
The end plate 35 is rotatable so that it can be laid down, and the biasing force P by the torsion spring 36 is not so large, and the end plate 35 can be laid down depending on the document ejection force P2. There is no problem even if you make a mistake. That is, as shown in FIG.
5 is set at a position shorter than the original size, the end plate 35 has a large ejection force P2 when ejected by the ejection roller 29 toward the end plate 35. be defeated like that. Such a collapsed state is maintained by the suction force of the suction plates 37 and 38. Therefore, the larger originals 14 are collected in a stacked state on the fallen end plate 35, which is different from being maintained in an upright state, and may cause a jam when the originals are ejected or re-feeded. Move smoothly without any hassle. In particular, end plate 3
Even when the end plate 5 is completely laid down, as shown in FIG. It is possible to apply a large weight to the paper to make it slippery, making it easier to return to the paper separation and feeding section. or,
When the end plate 35 is not completely laid down, the torsion spring 36 causes the end plate 35 to swing in an attempt to return to the upright position, so that the document 14 thereon is easily moved in the leading edge alignment direction.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7. This example uses different types of RADF
40, the edge alignment of the collected originals 41 is improved. First, the RADF 40 provided on the contact glass 43 on the top surface of the copying machine main body 42 is installed so that the document supply table 47 is slightly inclined above the conveyor belt 46 which is driven while being supported by the drive roller 44 and the driven roller 45. It is placed in a substantially horizontal position. This document supply table 47 is used to stack and set documents 41 with the document surface facing downward, and the right side in FIG.
is provided. Here, for the calling roller 49 side, a Mylar film 50 that also serves as a guide is attached to the RADF.
It extends from the cover 51 and contacts the calling roller 49 .

Further, in front of the calling roller 49, a separation roller 52 made of a high friction material such as Mule rubber is provided. A clutch is connected to the calling rollers 48, 49 and the separation roller 52, and is configured to rotate once for each original during document feeding.

A separation blade 53 made of urethane or the like is in pressure contact with the separation roller 52, and the separation roller 52
An inlet mold 54 is provided on the nearer side so as to be openable and closable. Further, the document supply table 47 is provided with a pair of left and right side fences 55, and a partition plate 56 for partitioning a group of documents 41 is provided so as to be rotatable by a small DC motor (not shown). ing.

Further, a pair of pull-out rollers 57 are provided ahead of the separation roller 52. This pullout roller 5
7 is set at a high pressure state because it is necessary to pull and convey the document 41 by overcoming the separation load caused by the separation roller 52 and the separation blade 53. A switchback type reversing path 59 is formed in front of the pull-out roller 57 toward an intermediate table 58 extending rightward. A pair of reversing section rollers 60 is provided for this reversing path 59. These reversing portion rollers 60 are driven so as to be freely forward and reverse.

Here, the intermediate table 58 is arranged obliquely from the right end of the contact glass 43,
The reversing path 59 has a continuous conveyance path toward the contact glass 43, and a pair of registration rollers 61 are provided at a position immediately in front of the contact glass 43. This registration roller 61 has a function such as correcting the skew of the document 41 to be fed to the contact glass 43 side.
One of the rollers is a pressure roller, and its pressure can be released by a solenoid.

On the other hand, a large-diameter reversing roller 62 and a curved reversing guide 6 are provided on the driven roller 45 side (sheet ejection side) of the conveyor belt 46.
3 and the substantially square-shaped guide 64 form a switchback-type reversing discharge path 65 around the reversing roller 62.

Therefore, the RADF cover 51 is attached to the document supply table 4.
7, and completely covers the upper part of the reversing discharge path 6.
It can be opened and closed freely by a fulcrum shaft 66 provided near the exit of 5. A selective ejection path 67 is formed in the RADF cover 51 and extends substantially horizontally above the document supply table 47, following the reversal ejection path 65.

For such selective discharge route 67, a plurality of
For example, four pairs of transport/discharge rollers 68, 89, 70.
71 is provided. Further, rotatable discharge position switching claws 72 and 73 for selectively opening and closing the selected paper discharge path 67 are provided at a position before each of the transport/discharge paper discharge rollers 68 to 71.
．． 74 are provided.

Note that 75 is a document set sensor, 76 is a forward/reverse switching sensor, 77 is a sensor, 78 is a registration sensor, 79 is a reversal sensor, and 80 is a discharge sensor.

Next, the drive system of the RADF 40 of this embodiment will be explained with reference to FIG. First, the first motor 81 for the separation sheet feeding section
is provided, and its motor gear 82 meshes with a gear 83 provided on the pull-out roller shaft 57a. A pulley 84 on the pull-out roller shaft 57a and a pulley 85 provided on the separation roller shaft 52a are connected by a belt 86. Also, the pulley 8 on the separation roller shaft 52a
7 and the pulley 88 on the calling roller shaft 49a are connected to the belt 8.
A gear 90 with a pulley 88 meshes with a gear 92 on the pick-up roller shaft 48a via an intermediate gear 91. On the other hand, the pullout roller shaft 57a
A belt 95 is passed through a guide pulley 94 between the pulley 84 provided above and the pulley 93 provided on the reversing portion roller shaft 60a. These are the drive transmission system by the first motor 81.

A second motor 96 is also provided for driving the drive roller 44 for the conveyor belt 46.

A motor gear 97 of this second motor 96 is meshed and connected to a gear 100 on the drive roller shaft 44a via intermediate gears 98 and 99 provided coaxially. Moreover, the motor gear 9
7 also meshes with a gear 101 provided on the registration roller shaft 61a, and rotates the registration roller 61 as well.

This is the drive transmission system using the second motor 96.

Further, a third motor 102 for driving the discharge side is provided near the reversing roller 62. This third motor 1
A reversing roller shaft 62 is attached to the motor pulley 103 on the shaft of 02.
The pulley 104 on a and the transport/discharge paper ejection roller shaft 68
a, 69 a, 70 a.

Pulleys 105, 106, 107, respectively provided on 71a.
The belt 1 is connected to the belt 108 via a guide pulley 109.
10 is passed. This is the drive transmission system using the third motor 102.

Note that the discharge position switching claws 72, 73, and 74 are appropriately switched and controlled by a solenoid (not shown) or the like.

In such a configuration, first, the RADF cover 51 is opened and the originals 41 are stacked and set on the original supply table 47 with the original surface facing downward.

Then, in response to the paper feeding start signal, the calling roller 48.4
9 rotates one revolution. At this time, the mylar film 50 presses the document 41 in conjunction with a cam (not shown), thereby applying a document conveying force to the calling roller 49 and guiding the lowest paper price to the separating section. When reaching the separation roller 52/separation blade 53 portion, the document 41 is separated into only the lowest sheet, and then passed through the pull-out roller 57 and transferred to the reversing path 5.
It is transported to the 9 side. At this time, when the sensor 76 detects that the rear end of the original 41 has passed, the reversing unit roller 60 reverses after a predetermined period of time, and the original 41 conveyed into the reversing path 59 is reversed in a switchback manner to the stopped register. It is sent so as to hit the roller 61 side. In this way, skew correction is performed. Moreover, the pressure on the auxiliary roller side is released. The speed of conveying the document 41 until it is separated and fed and then transported back is set to about 700 to 750 sheets/sec under the drive of the first motor 81. Then, when a predetermined period of about several milliseconds has elapsed after the contact with the registration roller 61, this registration roller 61
is driven by the second motor 96 to transport the original 41 onto the contact glass 43. At this time, the drive roller 44
The conveyor belt 46 is also rotationally driven.

There are two modes for copying the original on the contact glass 43.
The document 41 is fixed at the position indicated by x and is transferred to the conveyor belt 4.
There is a sheet-through copy mode in which latent image formation, etc. is performed while feeding the document 41 at a predetermined speed.
There is a scanning copy mode in which the document is conveyed to the stop leading edge position py and stopped, and a latent image is formed by scanning with an optical scanner.Also, in the sheet-through copy mode, the document conveyance speed by the conveyor belt 46 is selected. is slow.

Then, when the registration sensor 78 detects the leading edge of the document,
Synchronization (edge alignment) with the transfer paper on the copying machine main body 42 side is achieved. Then, the fixed exposure position P of the optical scanner
x is set at a position corresponding to one pressing roller 111 that presses the conveyor belt 46 onto the contact glass 43, and exposure is performed without lifting the original 41. When the trailing edge of the document 41 being exposed is detected by the registration sensor 78, the calling rollers 48, 49, separation rollers 52, etc. on the document supply table 47 are activated after a predetermined period of time.
It is rotated and starts separating and feeding the next document 41. In this way, while checking the exposure state of the preceding original 41, the paper feeding and transport is controlled so that the subsequent original 41 can be separated and fed as appropriate and immediately transported to the exposure position.
Loss time between multiple originals is reduced and copy efficiency (CPM) is improved.

On the other hand, in the scanning copy mode, the paper is transported at high speed to the stop position. At this time, when a predetermined number of pulses are counted from the detection of the leading edge of the document by the registration sensor 78, the driving of the conveyor belt 46 is stopped and the document 41 is stopped and set at a predetermined position on the contact glass 43. Then, exposure scanning is performed by an optical scanner.

In either mode, when the exposure process is completed, the document 41 on the contact glass 43 is moved to the reversing roller 6.
When the trailing edge of the document is detected by the reversal sensor 79 after advancing between the 2 and reversing guides 63, the reversing roller 62 is driven in the reverse direction. As a result, the document 41 is reversely fed, moves counterclockwise around the reversing roller 612 in a switchback manner, is guided by the guide 64, and is conveyed through the reversing discharge path 65. Then, the sheet advances to the selective ejection path 67 and is ejected from the selective ejection path 67 onto the original supply table 47 . From which position should the document 4 be ejected?
Depending on the size of the document 41, the ejection position switching claws 72, 73
．． The selection is made by switching the state of 74. The size of the document 41 is determined, for example, by counting the number of pulses of an encoder provided on the shaft of the pull-out roller 57 (upper driven side) while the sensor 76 is detecting the document 41. As a result, for example, in the case of a short document 41, it is ejected from the conveyance/discharge roller 71 located on the rightmost side, and its leading edge is aligned on the separation paper feeding unit side of the document supply table 47, If it is a document 41, it is ejected onto the document supply table 47 by the conveyance/discharge roller 70, 69, or 68 on the left side of this roller 71 depending on its length, and the leading edge of the document is also aligned on the separation paper feed unit side. It will be done like this. The original 41 discharged onto the original supply table 47 is held down by the Mylar film 50.

=26- In this way, regardless of the size of the original 41, the original 41 can be collected onto the original supply table 47 with the leading edges aligned.

Note that the intermediate table 58 of this embodiment can also be used as a manual paper feed tray.

After all, according to this embodiment, by selecting the discharge position of the original 41 according to the original size, it is possible not only to collect the original 41 onto the original supply table 47 in a state where the leading edges are aligned, but also to achieve an advantage in terms of processing speed. It's big. First, a path was formed to feed the original 41 onto the contact glass 43 via the reversing path 59 in a switchback manner.
The document 41 is not loaded with separation pressure or the document's own weight, and the document 41 can be transported without causing speed fluctuations.

This enables sheet-through exposure in which the original 41 is always conveyed at a constant speed, and a good copy image can be obtained. Since copying can be performed in the sheet-through mode in this way, it is possible to achieve a CPM close to the copy processing speed (CPM) when RADF4O is not provided. Furthermore, such sheet-through mode is selectively RAD
A scanning copy mode that takes advantage of the F40's features is also available, so for example, when making multiple copies of a small number of originals 41, it is possible to reduce the number of times the original is transported, improving copy processing speed. and can be used depending on the situation.

By the way, in the RADF as shown in Japanese Patent Application Laid-Open No. 59-197059, the original is inverted and fed onto the contact glass from the original supply table at the upper left of the contact glass, and after exposure scanning with an optical scanner, the original is placed on the contact glass. If the document is switched back from above, then reversed, and then collected on the document supply table, there is a limit to the document conveyance speed, and a significant improvement in CPM cannot be expected.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 60-102342, although the CPM is improved when the original is exposed and copied while being transported at a constant speed, it is possible to increase the CPM by scanning and moving the optical scanner for one original. It cannot be used as a normal ADF for making single copies, and is inconvenient depending on the copy mode.

Effects As described above, the present invention provides an end plate on the document supply table which is slidable via a slider and can be rotated up and down, and is biased into an upright state by a biasing member. By simply displacing the slide and setting the position, the end plate can be used for documents of various sizes, applying a repulsive force to the ejected document and collecting it with the leading edge aligned, making it possible to refeed the document etc. There will be no problems such as page order errors or non-feeding when printing, and since the end plate can be raised or lowered, even if the end plate is set in the wrong position, the ejected original will cause the end plate to fall down. It does not cause any inconvenience such as jamming.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a schematic perspective view of the document supply table, FIG. 2 is a side view showing the document ejection state, and FIG. 3 is the document FIG. 4 is a schematic side view showing a case where the size is large; FIG. 4 is a schematic side view mainly showing RADF; FIGS. 5 to 7 show a second embodiment of the present invention; FIG. FIG. 6 is a schematic side view showing the main body, FIG. 6 is a schematic side view showing its drive transmission system, FIG. 7 is a schematic side view showing the flow of documents, and FIG. 8 is a schematic side view showing a conventional example.

Claims (1)

[Claims] The originals stacked on a document supply table tilted toward the supply direction are separated one by one starting from the lowest sheet, fed and transported to the exposure position, and after exposure are discharged and collected onto the top of the originals on the document supply table. In the automatic document circulation feeding device, a slider is provided on the document supply table and is slidable in the document supply direction, and the slider is supported by a rotary fulcrum to be rotatable up and down with respect to the slider, and is mounted on the document supply table surface. What is claimed is: 1. An automatic document circulation feeding device, characterized in that a substantially vertical end plate is provided, and a biasing member is provided for biasing the end plate in a substantially vertical upright direction.