JP5282275B2 - Tray and sheet processing apparatus - Google Patents

Abstract

The invention provides a tray and a sheet processing device. The tray can inhibit a first part of sheet materials from generating bad loading. The tray is used for a processing device performing folding processing of a paper pile. The tray (32) is provided with a tray surface (3) loaded with a plurality of paper piles P output from the main body of the sheet processing device. A conveying part comprises conveyor belts (62a, 62b) extending along the X-axis direction on the tray surface (S), and the paper piles are made to be conveyed to the positive direction side of the X-axis direction. Rib plates (36a, 36b) are disposed at the falling-down point of the paper piles in the tray surface (S), and protrude from the tray surface (S) to a greater extent than the conveyor belts (62a, 62b). A friction coefficient between the rib plates (36a, 36b) and the paper piles is smaller than that between the conveyor belts (62a, 62b) and the paper piles.

Description

  The present invention relates to a tray and a sheet processing apparatus, and more particularly to a tray and a sheet processing apparatus used in a sheet processing apparatus that performs a folding process on a sheet bundle.

  As a sheet processing apparatus having a conventional tray, for example, a sheet post-processing apparatus described in Patent Document 1 is known. In the sheet post-processing apparatus, a plurality of folded sheet bundles are slightly shifted in a predetermined direction and arranged in a line on the tray. For this reason, the tray is provided with a belt for conveying the sheet bundle, and each time one sheet bundle is output, the output sheet bundle is conveyed on the tray by a predetermined distance in the predetermined direction. Is done.

  However, in the sheet post-processing apparatus described in Patent Document 1, there is a possibility that a stacking defect may occur in the first sheet bundle as described below. FIG. 13 is a diagram illustrating a state in which a stacking failure occurs in the first sheet bundle.

  In the sheet post-processing apparatus, the sheet bundle P is output from obliquely above the tray 500. When the first sheet bundle P is output, the sheet bundle P does not exist on the tray 500. Therefore, the first sheet bundle P contacts the belt 502 of the tray 500. Here, the belt 502 generates a relatively large frictional force with the sheet bundle P in order to convey the sheet bundle P. Therefore, the first sheet bundle P may be caught by the belt 502 and fall forward as shown in FIG. As a result, a stacking failure may occur in the first sheet bundle.

JP 2007-45620 A

  Accordingly, an object of the present invention is to provide a tray and a sheet processing apparatus that can prevent a stacking defect from occurring in the first sheet bundle.

  A tray according to an aspect of the present invention is a tray of a sheet processing apparatus that performs a folding process on a sheet bundle, and a tray on which a plurality of the sheet bundles output from the main body of the sheet processing apparatus are placed. A transport unit including a tray body having a surface and a belt extending in a predetermined direction on the tray surface, the transport unit transporting the sheet bundle toward the downstream side in the predetermined direction; A first projection provided at a dropping point of the sheet bundle and projecting from the tray surface larger than the belt, and a coefficient of friction between the first projection and the sheet bundle. Is smaller than the coefficient of friction between the belt and the sheet bundle.

  A sheet processing apparatus according to an aspect of the present invention includes the tray and a control unit, and the tray further includes a detection unit that detects whether or not the first protrusion is retracted. And the control means controls the conveying means so as not to convey the sheet bundle when the first protrusion is not retracted.

  According to the present invention, it is possible to suppress a stacking failure from occurring in the first sheet bundle.

It is a block diagram of a sheet processing apparatus. FIG. 6 is a diagram illustrating a sheet processing apparatus when performing a folding process on a sheet bundle P; FIG. 6 is a diagram illustrating a sheet processing apparatus when performing a folding process on a sheet bundle P; FIG. 6 is a diagram illustrating a sheet processing apparatus when performing a folding process on a sheet bundle P; FIG. 6 is a diagram illustrating a sheet processing apparatus when performing a folding process on a sheet bundle P; It is an external appearance perspective view of a tray. It is a perspective view of a tray. FIG. 6 is a diagram illustrating a state in which a plurality of sheet bundles P are placed on a tray. It is the figure which saw through the tray from the x-axis direction. It is the figure which saw through the tray from the x-axis direction. FIG. 6 is a diagram illustrating a state where a sheet bundle P is output to a tray. 6 is a flowchart illustrating an operation performed by a control unit of the sheet processing apparatus. FIG. 6 is a diagram illustrating a state in which a stacking failure occurs in the first sheet bundle.

  Hereinafter, a tray and a sheet processing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

(Configuration of sheet processing apparatus)
First, the configuration of the sheet processing apparatus 10 will be described. FIG. 1 is a configuration diagram of the sheet processing apparatus 10. FIGS. 2 to 5 are views showing the sheet processing apparatus 10 when the sheet bundle P is folded in half. In the following, in FIGS. 1 to 5, the left-right direction is defined as the x-axis direction, the vertical direction on the paper is defined as the y-axis direction, and the up-down direction is defined as the z-axis direction.

  The sheet processing apparatus 10 is used by being connected to an image forming apparatus such as a copying machine, and performs a folding process and a stapling process on a sheet bundle P composed of printed sheets (sheets) P0 output from the image forming apparatus. Apply. The two-fold process means that the sheet bundle P is folded once so that the sheet bundle P has a half size. The stapling process is a process for driving a stapler into the sheet bundle P. As shown in FIGS. 1 and 2, the sheet processing apparatus 10 includes a main body 12, a roller pair 14, a stacking tray 16, a stopper 18, a stapler 20, a chopper 22, a roller pair 24, a control unit 26, and a tray 30. .

  The main body 12 is a housing of the sheet processing apparatus 10 and accommodates the roller pair 14, the stacking tray 16, the stopper 18, the stapler 20, the chopper 22, the roller pair 24, and the control unit 26.

  The control unit 26 controls the operation of the sheet processing apparatus 10 and is configured by a CPU, for example.

  The roller pair 14 is provided on the side surface of the main body 12 on the negative side in the x-axis direction, and takes in the printed paper P0 output from the image forming apparatus into the main body 12. As shown in FIG. 1, the sheet P0 taken into the main body 12 by the roller pair 14 is conveyed to the stacking tray 16 by a roller pair and a guide (not shown).

  The stacking tray 16 is a flat plate extending in the z-axis direction in the main body 12 and is slightly inclined so as to advance toward the negative direction side in the x-axis direction as it goes toward the positive direction side in the z-axis direction. On the main surface of the stacking tray 16 on the positive side in the x-axis direction, the captured paper P0 is stacked.

  The stopper 18 aligns the plurality of sheets P0 so that the plurality of sheets P0 stacked on the stacking tray 16 coincide and overlap. Specifically, the stopper 18 has an L-shaped cross-sectional structure and is provided on the stacking tray 16. The plurality of sheets P0 are aligned by sliding down on the stacking tray 16 due to their own weight and coming into contact with the stopper 18. The stopper 18 can be moved on the stacking tray 16 in the z-axis direction.

  The stapler 20 is provided so as to sandwich the stacking tray 16 from both sides in the x-axis direction, and drives staples in the middle in the z-axis direction of the sheet bundle P composed of a plurality of sheets P0.

  The chopper 22 is a plate-like member that performs a folding process on the sheet bundle P that has been stapled. The chopper 22 is provided on the negative side of the stacking tray 16 in the x-axis direction, and is located near the middle of the stacking tray 16 in the z-axis direction. The chopper 22 is configured to be movable in a direction orthogonal to the stacking tray 16, and folds projecting toward the positive direction side in the x-axis direction by contacting the sheet bundle P from the negative direction side in the x-axis direction. Are formed on the sheet bundle P.

  The roller pair 24 plays a role of conveying the sheet bundle P. The roller pair 24 nips the sheet bundle P and performs a folding process.

  The tray 30 is provided on the negative side of the roller pair 24 in the z-axis direction, and the sheet bundle P output from the roller pair 24 is placed thereon. Details of the tray 30 will be described later.

(Folding process)
Next, the folding process performed by the sheet processing apparatus 10 will be described with reference to the drawings.

  As shown in FIG. 2, the stopper 18 moves from the end of the stacking tray 16 on the negative side in the z-axis direction toward the positive direction in the z-axis direction. As a result, the stapler 20 is positioned in the middle of the sheet bundle P in the z-axis direction. Then, the stapler 20 drives staples on the sheet bundle P.

  Next, as shown in FIG. 3, the stopper 18 moves to the end of the stacking tray 16 on the negative side in the z-axis direction. As a result, the chopper 22 is positioned in the middle of the sheet bundle P in the z-axis direction (that is, the position where the staple is driven).

  As shown in FIG. 4, the chopper 22 contacts the sheet bundle P from the negative side in the x-axis direction, forms a fold in the middle of the sheet bundle P in the z-axis direction, and passes the sheet bundle P between the roller pair 24. Push in. The roller on the positive side in the z-axis direction and the roller on the negative direction side in the z-axis direction of the roller pair 24 rotate clockwise and counterclockwise, respectively. As a result, as shown in FIG. 5, the sheet bundle P is output from the roller pair 24 to the tray 30 in a state where the folding process is performed.

(About the tray)
Next, the configuration of the tray 30 will be described with reference to the drawings. FIG. 6 is an external perspective view of the tray 30. FIG. 7 is a perspective view of the tray 30. FIG. 8 is a diagram illustrating a state in which a plurality of sheet bundles P are placed on the tray 30. 9 and 10 are perspective views of the tray 30 from the x-axis direction. FIG. 11 is a diagram illustrating a state in which the sheet bundle P is output to the tray 30.

  As shown in FIGS. 6 to 10, the tray 30 includes a tray main body 32, a conveying portion 34, ribs (projections) 36a, 36b, 38a, 38b, lever portions 42a, 42b (see FIG. 7), and a detection member 44a (see FIG. 6). 7), an actuator 50 and sensors 52 (see FIG. 8), 70 (see FIGS. 9 and 10).

  The tray main body 32 has a tray surface S on which a plurality of sheet bundles P output from the main body 12 are placed in a line in the x-axis direction, and includes a base portion 32a and a stopper portion 32b. . The base portion 32a has a tray surface S parallel to the xy plane. The stopper portion 32b is a plate-like member that is rotatably attached to the end portion on the positive side in the x-axis direction of the base portion 32a. The tip end of the stopper portion 32b in the x-axis direction is bent toward the positive direction side in the z-axis direction. As a result, when a plurality of sheet bundles P are placed side by side on the tray body 32, the sheet bundle P is prevented from being caught by the stopper portion 32b and falling off from the tray body 32 as shown in FIG. Yes.

  As shown in FIGS. 6 and 7, the transport unit 34 includes rollers 60 a and 60 b, belts 62 a and 62 b, and a drive unit 80. The rollers 60a and 60b are arranged in this order from the negative direction side in the y-axis direction to the positive direction side at the end portion on the negative direction side in the x-axis direction of the base portion 32a. Further, the transport unit 34 further includes two rollers (not shown in FIGS. 6 and 7). The two rollers are aligned in the y-axis direction at the end of the base portion 32a on the positive side in the x-axis direction. The belt 62a is stretched between the roller 60a and one roller (not shown). The belt 62b is stretched between the roller 60b and one of the rollers (not shown). Thus, the belts 62a and 62b extend in the x-axis direction on the tray surface S.

  The drive unit 80 includes a motor and a gear, and rotates the rollers 60a and 60b. Accordingly, the belts 62a and 62b move on the tray surface S toward the positive direction side in the x-axis direction. As a result, the sheet bundle P placed on the tray surface S is transported by the transport unit 34 toward the positive side in the x-axis direction.

  The ribs 36a and 38a, the lever portion 42a, and the detection member 44a constitute a fall prevention mechanism 90a. The ribs 36b and 38b and the lever portion 42b constitute a fall prevention mechanism 90b. The fall prevention mechanisms 90a and 90b prevent the sheet bundle P output from the roller pair 24 from being caught by the belts 62a and 62b and falling to the positive side in the x-axis direction.

  As shown in FIGS. 7 and 9, the ribs 36 a and 36 b are perpendicular to the y-axis direction and extend in the x-axis direction when the sheet bundle P is not placed on the tray surface S. A plate-like member having a surface. As shown in FIG. 11, the ribs 36a and 36b are provided at the dropping point A of the sheet bundle P on the tray surface S, and protrude from the tray surface S larger than the belts 62a and 62b to the positive side in the z-axis direction. ing. The ribs 36a and 36b are provided between the belts 62a and 62b, and are arranged in this order from the negative direction side to the positive direction side in the y-axis direction. Further, the friction coefficient between the ribs 36a and 36b and the sheet bundle P is smaller than the friction coefficient between the belts 62a and 62b and the sheet bundle P.

  The ribs 38a and 38b are perpendicular to the y-axis direction and extend in the x-axis direction when the sheet bundle P is not placed on the tray surface S, as shown in FIGS. A plate-like member having a surface. As shown in FIGS. 6 and 7, the ribs 38a and 38b are provided on the tray surface S on the negative side in the x-axis direction relative to the ribs 36a and 36b, and larger than the ribs 36a and 36b from the tray surface S. It protrudes to the positive side in the axial direction. The ribs 38a and 38b are provided between the belts 62a and 62b, and are arranged in this order from the negative direction side to the positive direction side in the y-axis direction. And the rib 38a is provided in the positive direction side of the y-axis direction rather than the rib 36a. The rib 38b is provided closer to the negative direction side in the y-axis direction than the rib 36b. Further, the friction coefficient between the ribs 38a and 38b and the sheet bundle P is smaller than the friction coefficient between the belts 62a and 62b and the sheet bundle P.

  As shown in FIG. 7, the lever portions 42a, 42b are connected to ribs 36a, 36b, 38a, 38b, respectively, and are trays that are rotatable about rotation axes Xa, Xb extending in the x-axis direction. It is supported by the main body 32 (base part 32a).

  More specifically, the rotation axis Xa is provided in the base portion 32a and extends in the x-axis direction on the positive side of the belt 62a in the y-axis direction. The rotation axis Xa is biased counterclockwise by a torsion coil spring or the like (not shown) when viewed from the negative side in the x-axis direction.

  The rib 36a is connected to the lever portion 42a on the positive side in the x-axis direction with respect to the rib 38a. Further, the rib 38a is connected to the lever portion 42a at a position farther from the rotation axis Xa than the rib 36a in the direction parallel to the tray surface S and perpendicular to the rotation axis Xa (that is, the y-axis direction). Has been.

  The rotation axis Xb is provided in the base portion 32a, and extends in the x-axis direction on the negative direction side of the belt 62b in the y-axis direction. The rotation axis Xb is urged clockwise by a torsion coil spring or the like (not shown) when viewed from the negative side in the x-axis direction.

  The rib 36b is connected to the lever portion 42b on the positive side in the x-axis direction than the rib 38b. Further, the rib 38b is connected to the lever portion 42b at a position farther from the rotation axis Xb than the rib 36b in a direction parallel to the tray surface S and perpendicular to the rotation axis Xb (that is, the y-axis direction). Has been.

  In the fall prevention mechanisms 90a and 90b having the above configuration, when the sheet bundle P is not placed on the tray surface S, the ribs 36a, 36b, 38a and 38b are moved from the tray surface S to the z position as shown in FIG. It protrudes to the positive side in the axial direction.

  On the other hand, when the sheet bundle P is placed on the tray surface S, the ribs 38a and 38b are in contact with the sheet bundle P (not shown in FIG. 10), as shown in FIG. A force is received on the negative side in the z-axis direction. Accordingly, the lever portions 42a and 42b are rotated clockwise and counterclockwise about the rotation axes Xa and Xb, respectively. As a result, the ribs 36a and 36b are also rotated clockwise and counterclockwise about the rotation axes Xa and Xb, respectively, and retracted to the negative side in the z-axis direction from the belts 62a and 62b. That is, the ribs 36a and 36b are retracted to a position where they do not contact the sheet bundle P. Hereinafter, the retreating of the ribs 36a and 36b to a position where the ribs 36a and 36b do not contact the sheet bundle P is simply referred to as the retraction of the ribs 36a and 36b.

  As shown in FIGS. 7, 9 and 10, the detection member 44a is a plate-like member connected to the lever portion 42a at the end on the positive side in the x-axis direction of the rotation axis Xa. It has a vertical surface. Therefore, the detection member 44a is rotated together with the rib 36a.

  The sensor 70 is provided in the base portion 32a, and determines whether or not the ribs 36a and 36b are retracted by detecting the posture of the detection member 44a. As shown in FIG. 9, the sensor 70 detects that the rib 36 a protrudes from the tray surface S when the detection member 44 a overlaps the sensor 70. On the other hand, as shown in FIG. 10, the sensor 70 detects that the rib 36 a is retracted when the detection member 44 a does not overlap the sensor 70.

  As shown in FIG. 6, the actuator 50 is a protrusion that protrudes from the tray surface S to the positive side in the z-axis direction in the vicinity of the end on the positive direction side in the x-axis direction of the tray surface S. The actuator 50 is biased to the positive side in the z-axis direction by an elastic body such as a spring. Therefore, the actuator 50 projects from the tray surface S when the sheet bundle P is not placed on the actuator 50. On the other hand, when the sheet bundle P is placed on the actuator 50, the actuator 50 is pushed down by the sheet bundle P and retracted from the tray surface S as shown in FIG.

  The sensor 52 is provided in the base portion 32a and detects whether the actuator 50 protrudes from the tray surface S or is retracted. That is, the sensor 52 detects that the tray main body 32 is full by detecting that the actuator 50 is pushed down and retracted from the tray surface S.

(Operation of sheet processing device)
Next, operations performed by the sheet processing apparatus 10 will be described with reference to the drawings. FIG. 12 is a flowchart illustrating an operation performed by the control unit 26 of the sheet processing apparatus 10.

  First, the control unit 26 determines whether or not a predetermined number of sheets P0 are stored in the stacking tray 16 (step S1). The predetermined number of sheets is the number of sheets P0 necessary to form one sheet bundle P. When the predetermined number of sheets P0 are stored, the process proceeds to step S2. If the predetermined number of sheets P0 is not stored, the process returns to step S1.

  Next, the control unit 26 performs stapling by causing the stapler 20 to drive staples on a predetermined number of sheets of paper P0 (step S2). Thereby, the sheet bundle P is generated.

  Next, the control unit 26 performs a folding process on the sheet bundle P by rotating the roller pair 24 and moving the chopper 22 to the positive side in the x-axis direction (step S3). As a result, the sheet bundle P is output to the tray surface S of the base portion 32a. Here, when the sheet bundle P is the first sheet bundle P of the plurality of sheet bundles P output in one job, as shown in FIG. , 36b, and slides on the ribs 36a, 36b to the positive side in the x-axis direction and is placed on the tray surface S. At this time, the sheet bundle P retracts the ribs 36a and 36b by pushing down the ribs 38a and 38b. When the sheet bundle P is the second and subsequent sheet bundles P of the plurality of sheet bundles P output in one job, the ribs 38a and 38b are output when the sheet bundle P is output. The sheet bundle P is already placed. Therefore, the ribs 36a and 36b are already retracted when the sheet bundle P is output. Then, the sheet bundle P is output on the output sheet bundle P.

  Next, the control unit 26 determines whether or not the ribs 36a and 36b are retracted (step S4). Specifically, as shown in FIG. 10, the control unit 26 determines whether or not the detection member 44a and the sensor 70 are overlapped. When the detection member 44a and the sensor 70 do not overlap with each other, the control unit 26 determines that the ribs 36a and 36b are retracted as shown in FIG. In this case, the process proceeds to step S5. When the detection member 44a and the sensor 70 overlap, the control unit 26 determines that the ribs 36a and 36b protrude from the tray surface S as shown in FIG. In this case, the process returns to step S4. That is, the control unit 26 determines that the output of the first sheet bundle P is not completed, and does not cause the conveyance unit 34 to convey the sheet bundle P shown in step S5.

  When the ribs 36a and 36b are retracted, the control unit 26 drives the transport unit 34 to move the sheet bundle P placed on the tray surface S by a predetermined distance on the positive direction side in the x-axis direction. It is conveyed (step S5). The predetermined distance is a distance shorter than the width of the sheet bundle P in the x-axis direction. As a result, the sheet bundle P output next overlaps the sheet bundle P output in step S3 as shown in FIG.

  Next, the control unit 26 determines whether or not to end this process (step S6). More specifically, the control unit 26 determines whether or not all the sheet bundles P to be output in one job have been output. When all the sheet bundles P are output, this process ends. If all the sheet bundles P have not been output, the process proceeds to step S7.

  When all the sheet bundles P are not output, the control unit 26 determines whether or not the tray main body 32 is full with the sheet bundle P (step S7). More specifically, the control unit 26 determines whether or not the sensor 52 detects that the actuator 50 is pushed down and retracted. When the actuator 50 is retracted, the control unit 26 determines that the tray body 32 is full with the sheet bundle P. In this case, this process ends. On the other hand, when the actuator 50 is not retracted, the control unit 26 determines that the tray body 32 is not full of the sheet bundle P. In this case, the process returns to step S1.

(effect)
As described above, according to the tray 30, it is possible to suppress a stacking failure from occurring in the first sheet bundle P among the plurality of sheet bundles P in which the sheet bundle P is output in one job. More specifically, the ribs 36a and 36b are provided at the dropping point A of the sheet bundle P on the tray surface S, and protrude more greatly from the tray surface S than the belts 62a and 62b. The friction coefficient between the ribs 36a and 36b and the sheet bundle P is smaller than the friction coefficient between the belts 62a and 62b and the sheet bundle P. As a result, as shown in FIG. 11, the first sheet bundle P collides with the ribs 36a and 36b before contacting the belts 62a and 62b, and the ribs 36a and 36b are moved to the positive side in the x-axis direction. It slides and is placed on the tray surface S. Therefore, the first sheet bundle P is prevented from being caught by the belts 62a and 62b and falling forward.

  Further, according to the tray 30, it is possible to place a larger number of paper bundles P on the tray 30. More specifically, as a method for preventing the sheet bundle P from being caught by the belts 62a and 62b and falling forward, it is conceivable to increase the conveying speed of the belts 62a and 62b, for example. However, in this case, since the overlap of the plurality of sheet bundles P becomes small, many sheet bundles P are not placed on the tray 30. Therefore, in the tray 30, the ribs 36a and 36b are provided to prevent the first sheet bundle P from falling forward. As a result, it is not necessary to increase the conveying speed of the belts 62a and 62b, and the overlap of the sheet bundles P becomes large. As a result, a large number of paper bundles P can be placed on the tray 30.

  The ribs 36a and 36b are configured to be retractable from the tray surface S. Therefore, the ribs 36a and 36b are prevented from obstructing the conveyance of the sheet bundle P by the belts 62a and 62b.

(Other embodiments)
The tray and the sheet processing apparatus according to the present invention are not limited to the tray and the sheet processing apparatus according to the embodiment, and can be changed within the scope of the gist thereof.

  The ribs 36a and 36b are retracted when the sheet bundle P contacts the ribs 38a and 38b. However, the ribs 36a and 36b may be retracted by a power source such as a motor, for example. In this case, instead of step S4 in FIG. 12, the control unit 26 determines whether or not the sheet bundle P is the first sheet bundle P of the plurality of sheet bundles P output in one job. Determine whether. When the sheet bundle P is the first sheet bundle P, the control unit 26 retracts the ribs 36a and 36b by a power source. Accordingly, the control unit 26 can adjust the timing for retracting the ribs 36a and 36b according to the number, size, paper thickness, and the like of the sheet bundle P.

  The control unit 26 adjusts the conveyance speed of the belts 62a and 62b, the predetermined distance at which the sheet bundle P is conveyed in step S5, and the like based on the timing at which the sensor 70 detects that the ribs 36a and 36b have been retracted. May be.

  As described above, the present invention is useful for a tray and a sheet processing apparatus, and is particularly excellent in that it is possible to suppress a stacking failure from occurring in the first sheet bundle.

S tray surface 10 sheet processing apparatus 12 main body 14, 24 roller pair 16 stacking tray 18 stopper 20 stapler 22 chopper 26 control unit 30 tray 32 tray main body 32a base unit 32b stopper unit 34 conveying units 36a, 36b, 38a, 38b ribs 42a, 42b Lever part 44a Detection member 50 Actuator 52, 70 Sensor 60a, 60b Roller 62a, 62b Belt 80 Drive part 90a, 90b Fall prevention mechanism

Claims (6)

A tray of a sheet processing apparatus that performs a folding process on a sheet bundle,
A tray main body having a tray surface on which a plurality of the sheet bundles output from the main body of the sheet processing apparatus are placed;
Conveying means including a belt extending in a predetermined direction on the tray surface, the conveying means conveying the sheet bundle toward the downstream side in the predetermined direction;
A first protrusion which is provided at a dropping point of the sheet bundle on the tray surface and protrudes more greatly from the tray surface than the belt;
With
A friction coefficient between the first protrusion and the sheet bundle is smaller than a friction coefficient between the belt and the sheet bundle;
Tray characterized by. The first protrusion is retracted to a position not in contact with the sheet bundle by outputting the sheet bundle to the tray surface;
The tray according to claim 1. A lever portion to which the first protrusion is connected, the lever portion being supported with respect to the tray body so as to be rotatable about a rotation axis;
A second protrusion connected to the lever portion upstream of the first protrusion in the predetermined direction, the second protrusion protruding from the tray surface than the first protrusion;
Is further provided,
The first protrusion is retracted by the second protrusion being in contact with the sheet bundle and the lever portion being rotated about the rotation axis;
The tray according to claim 2. The second protrusion is provided at a position parallel to the tray surface and further away from the rotation axis than the first protrusion in a direction perpendicular to the rotation axis;
The tray according to claim 3. The conveying means includes two belts,
The first protrusion is provided between the two belts;
5. The tray according to any one of claims 1 to 4, wherein: A tray according to any one of claims 1 to 5,
Control means;
With
The tray
Detecting means for detecting whether or not the first protrusion is retracted;
In addition,
The control means controls the conveying means so as not to convey the sheet bundle when the first protrusion is not retracted;
A sheet processing apparatus.

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