JP2010275098A - Paper delivery device, paper post-processing device, and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper delivery device dispensing with a space sufficient for preventing a paper delivery tray from interfering with the other constituent elements, installable in even a small space, and preventing various kinds of papers having different sizes from being rolled up compared with a paper delivery device having an angle of paper delivery for preventing papers from being rolled up by moving the paper delivery tray. <P>SOLUTION: This paper delivery device includes a paper delivery guide plate 17 having a basic part supported pivotally on a machine frame 1 of this device and a tip extended in the direction of paper delivery and provided to swing in the direction crossing a paper conveyance path 9 orthogonally, a driven roller support rod 18 having a basic part supported pivotally on a tip or a halfway part of the paper delivery guide plate 17 and a following roller 19 supported pivotally on a tip, and a paper delivery angle control unit letting the paper delivery guide plate 17 swing to move the following roller 19 along an outer peripheral face of a driving roller 20 through the following roller support rod 18, letting the following roller 19 to abut on the driving roller 20 to follow its movement and rotate, and controlling the inclination of a paper delivery nip formed by the abutting to form the angle of paper delivery for preventing paper from being rolled up. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an image forming apparatus that forms an image on a paper such as a copying machine, a printer, and a facsimile, and a paper discharge device in a paper post-processing apparatus that performs post-processing such as stapling on the paper on which the image has been formed.

The paper discharge device in the image forming apparatus or the paper post-processing apparatus is provided below the paper discharge nip through the paper on which the image has been formed in the paper discharge nip formed by the driven roller in contact with the driven roller. The paper is discharged to the discharged paper discharge tray.
This paper discharge device has a problem that the paper is curled when the paper is discharged to the paper discharge tray. It is known that the rounding of the sheet is likely to occur as the angle at which the leading end of the sheet comes into contact with the sheet discharge tray or the sheet bundle loaded on the sheet discharge tray approaches a right angle.
In order to solve this problem, the following has been proposed.
There is a configuration in which the inclination angle of the output tray can be changed, and the angle between the output tray or the stack of paper stacked on the output tray and the leading edge of the output paper is controlled so that the paper does not curl. Yes (see, for example, Patent Document 1).
The paper discharge tray is provided so that the stacking surface on which the paper is stacked is inclined upward, a substantially horizontal plane is provided in the middle of the stacking surface, and the leading edge of the paper is brought into contact with the portion on the substantially horizontal plane so that the paper is Some are not rounded (see, for example, Patent Document 2).

However, the former technical means is preferable in terms of solving the curling of paper, but operates the entire paper discharge tray, so that sufficient space is required to avoid interference with other components. It was.
The latter technical means cannot cope with sheets of different sizes because the position of the substantially horizontal plane is unchanged. It is technically difficult to vary the position of the substantially horizontal plane.
SUMMARY An advantage of some aspects of the invention is that it provides a paper discharge device, a paper post-processing device, and an image forming apparatus that can solve the above problems.

In order to solve the above problems, the present invention has taken the following technical means.
According to a first aspect of the present invention, there is provided a paper discharge device that discharges the paper to a paper discharge tray through a paper discharge nip formed by contacting a driven roller with a driven roller so as to be driven to rotate. A first link that is pivotally supported by the machine frame and extends in the paper discharge direction, and the front portion is provided so as to be swingable in a direction orthogonal to the sheet conveyance path; and the first link A second link having a base portion pivotally supported at a front portion or a middle portion and a driven roller pivotally supported at a front portion; and the first link is swung, and the driven roller is moved via the second link. A discharge angle control unit that moves along the outer peripheral surface of the drive roller and controls the inclination of the discharge nip so as to have a discharge angle that avoids curling of the paper. To do.
According to a second aspect of the present invention, in the first aspect, the discharge tray is configured such that a stacking surface on which the sheets are stacked can be displaced between a flat shape and a substantially square shape, and the base side of the stacking surface is the loading surface. The stacking surface is configured to be able to swing in the vertical direction around a midway portion, and the stacking surface is inclined upward. The discharge angle control unit is configured such that the discharge angle is set to the base side of the stacking surface. The tilt angle is controlled to be substantially the same angle or the same angle.
According to a third aspect of the present invention, in the second aspect, the discharge tray is displaced in a flat shape when the number of sheets stacked is less than a predetermined number, and the number of sheets stacked is a predetermined number or more. In this case, the stacking surface is displaced in a substantially U shape, and the discharge angle control unit can change the inclination of the discharge nip based on the count of the number of discharged sheets stacked on the discharge tray. It is characterized by making it.

According to a fourth aspect of the present invention, in the first or second aspect of the invention, there is provided an inclination angle detection unit that detects an inclination angle of the paper discharge tray or an inclination angle of the paper stacked on the paper discharge tray, The angle control unit varies the inclination of the paper discharge nip based on the inclination angle detected by the inclination angle detecting means.
According to a fifth aspect of the present invention, in the fourth aspect, the inclination angle detection unit includes a distance detection sensor that is provided in the first link and detects a distance to the paper stacked on the paper discharge tray. The tilt angle is calculated from a plurality of distance data detected from the distance detection sensor by swinging the first link by a predetermined angle.
According to a sixth aspect of the present invention, in the fifth aspect, the distance detection sensor is also used as a sensor for detecting the fullness of the sheets stacked on the paper discharge tray and a stacking failure detection sensor. .

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the first link is also used as a paper discharge guide plate that forms a part of a conveyance path through which the paper passes. And
According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the driven roller is provided so as to be in contact with the driving roller by its own weight. .
According to a ninth aspect of the present invention, there is provided a paper post-processing device including the paper discharge device according to any one of the first to eighth aspects and a stapler unit that causes the paper to be stapled.
According to a tenth aspect of the present invention, there is provided an image forming apparatus including the paper discharge device according to any one of the first to eighth aspects and an image forming unit that forms the image on the paper.
According to an eleventh aspect of the present invention, there is provided an image forming apparatus including the paper post-processing apparatus according to the ninth aspect and an image forming unit that forms the image on the paper.

  According to the present invention, the driven roller that contacts the drive roller so as to be driven to rotate is pivotally supported by the second link that is pivotally supported by the first link that is swingable in the direction orthogonal to the sheet conveyance path. , By swinging the first link, the driven roller moves along the outer peripheral surface of the drive roller, and the paper discharge angle (the elevation angle of the paper when it is discharged from the paper discharge nip) can avoid curling of the paper. Compared with the technical means that makes the paper discharge tray movable and makes it possible to avoid paper curling, it avoids interference between the paper output tray and other components. Therefore, it is not necessary to provide a sufficient space, and it can be provided even in a narrow space. Further, since the discharge angle can be continuously changed, it is possible to deal with various types of paper including the paper size.

1 is a front view showing an outline of an image forming apparatus according to an embodiment. FIG. 2 is a partially enlarged view of the sheet post-processing apparatus of FIG. 1. FIG. 3 is a partially enlarged view of the sheet post-processing apparatus illustrating the operation following FIG. 2. FIG. 6 is a partially enlarged view of a sheet post-processing apparatus during a staple process. It is the model which showed operation | movement of the driven roller.

Embodiments of a paper discharge device according to the present invention will be described with reference to the drawings.
The paper discharge device according to the present embodiment is illustrated as being incorporated in a paper post-processing device provided in an electrophotographic image forming apparatus.
First, an outline of a main body unit for image formation of the image forming apparatus will be described.
The main body has the same configuration as that of a known electrophotographic image forming apparatus. As shown in FIG. 1, a paper discharge unit 2 in which a middle part of one side surface is recessed inward in a substantially U shape. And an apparatus frame 1 that forms the external shape of the image forming apparatus and supports each component therein, an image scanner unit 3 that is provided in the upper part of the apparatus and reads a document, and a paper feed that is provided in the lower part of the apparatus A toner image is formed based on image data transmitted from the image scanner unit 3 or the outside, provided in the tray 4 and the intermediate unit of the apparatus, the toner image is conveyed to the intermediate transfer belt 6, and is transferred to a sheet by the transfer unit 7. An image forming unit 5 to be transferred and a fixing device 8 provided near the upper side of the image forming unit 5 and fixing a toner image on a sheet are provided.
Further, the paper fed from the paper feed tray 4 passes through the transfer unit 7, the fixing device 8, and a paper post-processing device 12 described later in order, and reversely passes from the fixing device 8 to the transfer unit 7. In addition, a conveyance path 9 using a plurality of guide plates, a plurality of roller pairs, and a switching claw 11 (a conveyance path for reversing the paper is referred to as a reversal path 10) is formed.

  The main body configured as described above forms a toner image based on image data transmitted from the image scanner unit 3 or from the outside, conveys the toner image to the transfer unit 7 by the intermediate transfer belt 6, and feeds paper. 4, the toner image is transferred by the transfer unit 7 to the paper conveyed from 4, the toner image is melted and fixed on the paper by the fixing device 8, and sent to the paper post-processing device 12. When an image is also formed on the back side of the paper, after the toner image is fixed on the front surface of the paper by the fixing device 8, the paper is once pulled back so that the leading edge of the paper does not touch the switching claw 11, and the direction of the switching claw 11 is switched. The sheet is fed into the reverse path 10. The toner image for the back side is transferred to the back side of the paper again in the transfer unit 7 through the reverse path 10, and the toner image for the back side is melted and solidified on the paper by the fixing device 8 and fixed. It sends out toward the processing device 12.

Next, the paper post-processing device 12 will be described.
As shown in FIG. 2, the sheet post-processing device 12 includes a roller conveying unit, a driven roller unit, a driving roller 20, a sheet discharge tray 22, a stapler 30 unit, a sheet pressing bar 33, and an inclination angle detecting unit. And a paper discharge angle control unit, which are provided in the paper discharge unit 2 of the apparatus frame 1 described above.
The roller transport unit is driven to the pair of upper and lower guide plates 13 that guides the sheet over a required length while feeding the sheet fed from the main body of the image forming apparatus, and to the inlet side and the outlet side of the guide plate. An inlet roller pair 14 and an outlet roller pair 15 that are rotatably provided by a motor (not shown) and convey a sheet are provided.
The driven roller portion is a drive motor (not shown) in the apparatus machine frame 1 in the vicinity of the exit side of the exit roller pair 15 and slightly above the exit roller pair 15 in the paper width direction (FIG. 2, depth direction). ) And a pivot shaft 16 that is pivotably mounted, and the pivot shaft 16 is inserted into the upper portion of the base, and the leading portion that extends toward the paper discharge direction is orthogonal to the sheet conveyance path 9. And a plate-like discharge guide plate 17 (first link) having a lower corner portion formed in a chamfered shape, and a middle portion of the discharge guide plate 17. A driven roller support rod 18 (second link) that is pivotally supported at the bottom and pivotally supported in a direction orthogonal to the paper transport path 9 and rotated to the front portion of the driven roller support rod 18. And a driven roller 19 pivotally supported.

The driven roller 19 has a required length, and a pair of paper discharge guide plates 17 and a driven roller support rod 18 support the one driven roller 19 at both ends, or a plurality of driven rollers 19 are used. The driven roller 19 is supported at both ends by a pair of paper discharge guide plates 17 and driven roller support rods 18 corresponding to the driven rollers 19, or cantilevered instead of the both-ends support described above. The aspect is not particularly limited.
Further, the driven roller support rod 18 described above is restricted from rotating counterclockwise in the drawing by a pin (not shown) protruding from the paper discharge guide plate 17, as shown in FIG. When the driven roller 19 and the driving roller 20 are separated from each other, the driven roller 19 is prevented from drooping.
The driving roller 20 is erected at a required height from the middle part of the paper discharge unit 2 and is driven by the driven roller 19 in the vicinity of the top of the abutting wall 21 that abuts the rear end of paper loaded on a paper discharge tray 22 described later. It is pivotally supported on the device frame 1 so as to be able to come into contact with the lower outer peripheral surface and to be rotatable by a drive motor (not shown). The driving roller 20 is composed of one or a plurality of rollers so as to correspond to the driven roller 19.

The driving roller 20 and the driven roller unit operate as shown in FIG.
That is, the driven roller 19 that is in contact with the drive roller 20 whose position is not changed moves the shaft support position of the driven roller support rod 18 in the lower right direction in FIG. Then, it rolls clockwise with respect to the drive roller 20. As a result, the inclination of the paper discharge nip formed by contacting the driven roller 19 with the driven roller 20 changes, and the paper discharge angle, which is the elevation angle of the paper being discharged from the paper discharge nip, changes.
In the present embodiment, the curving of the paper is prevented by making the inclination angle of the movable plate 25 of the paper discharge tray 22 to be described later and the paper discharge angle coincide or substantially coincide.
The paper discharge tray 22 is obliquely inclined upward and outward from the base end of the abutting wall 21 below the paper discharge nip, and is formed in a slanted shape from the midway part to the front end. A paper discharge tray main body 23 having a recess 24 formed from the top to the front end thereof, and is pivotally supported by a drive motor (not shown) in the middle of the paper discharge tray main body 23 toward the base end of the abutting wall 21. And a movable plate 25 (on the base side of the stacking surface 26) that can be accommodated in the recess 24. As shown in FIG. 3, the discharge tray 22 has a movable plate 25 that is swung by the rotation of a drive motor, so that a stacking surface 26 on which sheets are stacked can be displaced between a flat shape and a substantially square shape. It has become.

Here, the inclination angle of the movable plate 25 when the stacking surface 26 is formed in a flat shape is α ′ (see FIG. 2), and the inclination angle of the movable plate 25 when the stacking surface 26 is formed in a substantially U shape. Is β ′ (see FIG. 3).
The stapler 30 part has a sharp tip located at the top of the abutting wall 21 and is inclined obliquely downwardly toward the inside of the apparatus, and is placed on the base of the staple tray 27 to stand behind the sheet. A rear end reference fence 28 that aligns the vertical width direction of the paper by abutting the edges, a pair of jogger fences 29 that can be contacted and separated in the paper width direction on the staple tray 27 and aligns the horizontal width direction of the paper, and a staple A stapler 30 that binds the rear end of the sheet bundle on the tray 27 and the vicinity of the rear end reference fence 28 are provided as home positions. The stapler 30 can be moved forward and backward toward the staple tray 27 and moved to the apparatus frame 1. A tapping roller 31 that is pivotally supported and the vicinity of the driven roller 19 are provided as home positions so as to move forward and backward toward the staple tray 27. Rotatably by the drive motor to the machine frame 1 (not shown) returns axially supported by a rear end and a roller 32.
The sheet presser bar 33 is formed in a substantially square shape, and a base portion is pivotally supported by a drive motor (not shown) inside the apparatus of the abutting wall 21 so as to be formed on the abutting wall 21. The front side swings so as to be able to protrude and retract from the abutting wall 21 through the slit hole 34 extending vertically and to press down the paper on the paper discharge tray 22.

The inclination angle detection means includes a non-contact type distance detection sensor 35 attached to the front portion of the paper discharge guide plate 17, and swings the paper discharge guide plate 17 by a predetermined angle, before and after the swing. Is detected by a distance detection sensor 35, and the inclination angle of the movable plate 25 of the paper discharge tray 22 or the inclination angle of the paper loaded on the movable plate 25 portion of the paper discharge tray 22 is calculated. The distance detection sensor 35 is a full detection sensor that detects whether or not the paper loaded on the paper discharge tray 22 is full, and whether or not the paper is normally placed on the paper discharge tray 22. This is also used as a loading failure detection sensor for detecting the above. Note that a plurality of distance detection sensors 35 may be provided in the discharge direction, and the swinging operation of the discharge guide plate 17 at a predetermined angle may be omitted.
A paper discharge angle control unit (not shown) calculates the inclination angle of the movable plate 25 of the paper discharge tray 22 calculated by the inclination angle detection means or the inclination angle of the paper loaded on the movable plate 25 portion of the paper discharge tray 22. Based on the above, the inclination of the paper discharge nip formed by operating the paper discharge guide plate 17 and bringing the driven roller 19 into contact with the driving roller 20 is determined to be the paper discharge angle, that is, the inclination at which paper rounding can be avoided. It is configured to be controllable so as to be the same angle as or an angle close to the angle, and will be described in detail in the following operation description. The paper discharge device includes a driven roller unit, a driving roller 20, an inclination angle detection unit, and a paper discharge angle control unit.

Next, the operation of the sheet post-processing apparatus 12 configured as described above will be described.
As described above, the sheet moves from the fixing device 8 through the roller pair to the sheet post-processing device 12. Then, according to the paper discharge mode selected by the user, the paper is discharged to the paper discharge tray 22 as follows.

[In straight output mode]
The guide plate 13, the entrance roller pair 14, and the exit roller pair 15 feed the paper on which image formation has been completed in the main body portion, and feed it toward the paper discharge guide plate 17. The paper discharge guide plate 17 is positioned downward so that the driven roller 19 comes into contact with the driving roller 20. The paper discharge guide plate 17 holds the paper in a paper discharge nip formed by the contact between the driving roller 20 and the driven roller 19 and is movable. The inclination angle of the plate 25 is set to α ′ and the stacking surface 26 is sent out to the flat discharge tray 22. At this time, the paper discharge angle control unit controls the operation of the paper discharge nip so that the paper discharge angle α is the same as the inclination angle α ′ calculated by the inclination angle detector. Further, the front end of the sheet presser bar 33 is retracted by being immersed in the abutting wall 21 so as not to obstruct the discharge (see FIG. 2).

When the paper is discharged to the paper discharge tray 22, the paper presser bar 33 swings and presses the paper on the paper output tray 22, and immediately before the next paper is completely discharged, the paper presser bar 33 swings and retreats. To do. Then, for every several sheets of discharged paper, the movable portion lowers once, the stacking surface 26 is made substantially U-shaped, the rear end of the paper is aligned, and the retracted paper presser bar 33 swings to make the paper While pressing the rear end, the loading surface 26 rises so as to be flat.
When the number of sheets stacked on the paper discharge tray 22 (the number of images is counted by the counter of the main unit) exceeds a predetermined number, the sheet stacking surface 26 is controlled by the control of the main unit or the control unit of the paper post-processing device 12. Is displaced in a letter shape. The paper discharge angle control unit controls the operation of the paper discharge nip so as to feed the paper to the paper discharge tray 22 so that the paper discharge angle β is the same as the inclination angle β ′ calculated by the inclination angle detector (FIG. 3). As described above, the sheet presser bar 33 alternately repeats the pressing operation and the retracting operation of the sheet on the paper discharge tray 22.
The distance detection sensor 35 detects that the predetermined distance has been reached and the number of stacked sheets has reached a full level, and the main body unit interrupts image formation based on the detection. Further, when the detection signal of the distance detection sensor 35 is greatly deviated from the assumed value or the detection signal is disturbed, it is determined that the paper is not normally placed on the paper discharge tray 22, Based on the detection, image formation is interrupted.

[In the staple output mode]
The guide plate 13, the entrance roller pair 14, and the exit roller pair 15 feed the paper on which image formation has been completed in the main body portion, and feed it toward the paper discharge guide plate 17. At this time, as shown in FIG. 4, the paper discharge guide plate 17 swings clockwise to separate the driven roller 19 from the drive roller 20.
Immediately after the trailing edge of the paper exits the exit roller pair 15, the paper falls and slides down on the staple tray 27, and the tapping roller 31 and the trailing edge return roller 32 move toward the paper immediately while pressing the paper. The rear end of the sheet is brought into contact with the end reference fence 28 to perform vertical width alignment. Then, the hitting roller 31 and the rear end return roller 32 return to the home position, and the width is aligned by the jogger fence 29. The same operation is repeated until the final sheet, and when the final sheet is stacked on the staple tray 27, the stapler 30 performs the binding process.
Then, the paper discharge guide plate 17 swings counterclockwise, the driven roller 19 comes into contact with the driving roller 20, the paper bundle is pinched by the paper discharge nip formed by this contact, and is sent to the paper discharge tray 22. Since the discharge operation to the discharge tray 22 including the relationship between the discharge angle by the discharge nip and the inclination angle of the movable plate 25 is the same as the straight discharge mode described above, the description is omitted.

As described above, in the paper post-processing device 12 according to the present embodiment, the shaft support position of the driven roller support rod 18 is displaced by the downward movement of the paper discharge guide plate 17, and the driven roller 19 is moved on the driving roller 20. As a result, the inclination of the discharge nip formed by contacting the driven roller 19 with the driven roller 20 changes, and the discharge angle, which is the elevation angle of the paper being discharged from the discharge nip, changes. Since it is possible to set a discharge angle at which paper curling can be avoided, the paper discharge tray 22 and the like can be compared with other technical means that move the paper discharge tray 22 so as to avoid paper curling. A sufficient space for avoiding interference with the above-described structure is not required, and it is possible to provide a narrow space such as the paper discharge unit 2 in which the middle part of one side surface is recessed in a substantially U-shape toward the inside. . Further, since the discharge angle can be continuously changed, it is possible to cope with various types of paper including the paper size.
Although the present embodiment has been described above, the above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto and does not depart from the gist thereof. Various modifications can be made within the range.

In the present embodiment, the inclination angle is calculated by the inclination angle detection means, and the inclination of the discharge nip is varied so that the discharge angle becomes the same as the inclination angle. However, the movable plate before and after the operation is moved. Since the inclination angle of 25 is known, the inclination of the discharge nip is adjusted in advance to the inclination angle of the movable plate 25 before operation, and when the number of sheets stacked on the discharge tray 22 reaches a predetermined number, The inclination of the sheet discharge nip may be varied in accordance with the timing at which the stacking surface 26 is displaced in a substantially U shape.
Further, in the present embodiment, an example in which the discharge tray can be displaced in a substantially U shape is illustrated, but the inclination angle of the entire discharge tray is configured to be variable, and the discharge nip is adjusted according to the inclination angle. You may vary the inclination of.
Further, in the present embodiment, the paper discharge device incorporated in the paper post-processing device provided in the electrophotographic image forming apparatus is exemplified, but the paper post-processing device of the type attached to the electrophotographic image forming device is used. It may be incorporated. Further, instead of the paper post-processing apparatus, it may be incorporated in the paper discharge unit of a single image forming apparatus. The image forming apparatus may be an ink jet image forming apparatus, and is not limited to an electrophotographic image forming apparatus.

DESCRIPTION OF SYMBOLS 1 ... Apparatus machine frame, 2 ... Paper discharge part, 3 ... Image scanner part, 4 ... Paper feed tray, 5 ... Image formation means, 6 ... Intermediate transfer belt, 7 ... Transfer part, 8 ... Fixing device, 9 ... Conveyance path DESCRIPTION OF SYMBOLS 10 ... Reverse path, 11 ... Switching claw, 12 ... Paper post-processing apparatus, 13 ... Guide plate, 14 ... Inlet roller pair, 15 ... Outlet roller pair, 16 ... Rotating shaft, 17 ... Discharge guide plate (1st 18) driven roller support rod (second link), 19 driven roller, 20 drive roller, 21 abutting wall, 22 discharge tray, 23 discharge tray main body, 24 recess, 25. Movable plate, 26. Loading surface, 27. Stipple tray, 28. Rear end reference fence, 29. Jogger fence, 30. Stippler, 31. 34 ... Slit hole, 35 ... Distance detection sensor

JP-A-10-324445 Japanese Patent Laid-Open No. 11-165935

Claims (11)

A paper discharge device for discharging the paper to a paper discharge tray through a paper discharge nip formed by contacting a driven roller with a driven roller so as to be driven to rotate;
A first link in which a base is pivotally supported on an apparatus machine frame, a tip is extended in a paper discharge direction, and the tip is swingable in a direction orthogonal to the sheet conveyance path;
A second link in which a base is pivotally supported at the tip or midway of the first link and the driven roller is pivotally supported at the tip;
The first link is swung, and the driven roller is moved along the outer peripheral surface of the driving roller via the second link so that the paper discharge angle can avoid the curling of the paper. A paper discharge device comprising: a paper discharge angle control unit for controlling the inclination of the paper discharge nip. The paper discharge tray is configured such that the stacking surface on which the sheets are stacked can be displaced between a flat shape and a substantially square shape, and the base side of the stacking surface can swing up and down around the middle of the stacking surface. And is provided so that the loading surface is inclined upward,
2. The paper discharge device according to claim 1, wherein the paper discharge angle control unit controls the paper discharge angle to be substantially the same angle or the same angle as an inclination angle on a base side of the stacking surface. . The paper discharge tray displaces the stacking surface in a flat shape when the number of sheets stacked is less than a predetermined number, and makes the stacking surface substantially U-shaped when the number of sheets stacked is a predetermined number or more. Displaced,
The paper discharge device according to claim 2, wherein the paper discharge angle control unit varies the inclination of the paper discharge nip based on a count of the number of discharged sheets stacked on the paper discharge tray. An inclination angle detecting means for detecting an inclination angle of the paper discharge tray or an inclination angle of the paper stacked on the paper discharge tray;
The paper discharge apparatus according to claim 1 or 2, wherein the paper discharge angle control unit varies the inclination of the paper discharge nip based on the inclination angle detected by the inclination angle detection means. The inclination angle detecting means is
A distance detection sensor provided on the first link for detecting a distance to the sheet stacked on the paper discharge tray, and detected by the distance detection sensor by swinging the first link by a predetermined angle; The paper discharge device according to claim 4, wherein the inclination angle is calculated from a plurality of distance data.   6. The paper discharge device according to claim 5, wherein the distance detection sensor is also used as a sensor for detecting the fullness of the paper stacked on the paper discharge tray and a sensor for detecting a stacking failure.   The paper discharge device according to claim 1, wherein the first link is also used as a paper discharge guide plate that forms a part of a conveyance path through which the paper passes.   The paper discharge device according to claim 1, wherein the driven roller is provided so as to be in contact with the driving roller under its own weight. A paper discharge device according to any one of claims 1 to 8,
A paper post-processing apparatus, comprising: a stapler section that causes the paper to be stapled. A paper discharge device according to any one of claims 1 to 8,
An image forming apparatus comprising: an image forming unit that forms the image on the paper. A sheet post-processing apparatus according to claim 9;
An image forming apparatus comprising: an image forming unit that forms the image on the paper.

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