JP2017071459A - Paper discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit fixed curl removal effects regardless of types of paper sheets in a paper discharge device.SOLUTION: A paper discharge device includes a drive roller 41, a first driven roller 42, an energizing member 43 and a second driven roller 44. The drive roller 41 has a first outer peripheral surface S1 and rotates about a first axis A1. The first driven roller 42 has a second outer peripheral surface S2 coming into contact with the first outer peripheral surface S1 at a first contact location TP1, can come close to/separate from the drive roller 41 and rotates about a second axis A2 along with the rotation of the drive roller 41 to carry paper P. The energizing member 43 elastically energizes the first driven roller 42 relative to the drive roller 41. The second driven roller 44 includes a third outer peripheral surface S3 coming into contact with the first outer peripheral surface S1 at a second contact location TP2 downstream of the first contact location TP1, cannot be relatively displaced to the drive roller 41 and rotates about a third axis A3 along with the rotation of the drive roller 41 to carry the paper P.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a paper discharge device that is provided in an image forming apparatus that forms an image on paper and discharges the paper on which the image has been formed to the outside.

2. Description of the Related Art Conventionally, in an image forming apparatus that forms an image on a sheet by electrophotography, when the sheet is heated to fix toner on the sheet, moisture evaporates from the heated surface of the sheet. As a result, it is known that the heated surface of the paper contracts and the paper curls.
Patent Document 1 discloses a paper discharge device that removes curl generated on a paper by a plurality of driven rollers that press the curved surface of the paper discharge roller when the paper is discharged.

JP 11-65192 A

In the paper discharge device, the pressing force when the plurality of driven rollers press the circumferential surface is generated by a spring that biases the plurality of driven rollers.
When adjusting the pressing force of the roller with a spring, for example, when discharging thick paper, the roller is pushed back by the thickness of the paper, while for thin paper, the roller presses the paper excessively. Resulting in. Thus, in the conventional paper discharge device, the curl removal effect differs depending on the type of paper (particularly, the thickness of the paper).

  An object of the present invention is to stably generate a curl removing effect in a paper discharge device provided in an image forming apparatus that forms an image on paper regardless of the type of paper.

Hereinafter, a plurality of modes will be described as means for solving the problems. These aspects can be arbitrarily combined as necessary.
A paper discharge apparatus according to an aspect of the present invention is provided in an image forming apparatus that forms an image on a paper, and discharges the paper on which the image has been formed to the outside. The paper discharge device includes a driving roller, a first driven roller, a biasing member, and a second driven roller.
The drive roller has a first outer peripheral surface extending in a second direction orthogonal to the first direction for discharging the paper to the outside. The drive roller is rotatable about a first axis parallel to the second direction.
The first driven roller has a second outer peripheral surface that extends in the second direction and contacts the first outer peripheral surface at the first contact position. The first driven roller is a roller that can approach and separate from the drive roller. The first driven roller rotates around the second axis parallel to the second direction according to the rotation of the driving roller in a state where the paper is nipped between the first outer peripheral surface and the second outer peripheral surface, thereby Is conveyed in the first direction. “Nip” means to sandwich a sheet between two rollers.
The biasing member elastically biases the first driven roller against the drive roller so that the first outer peripheral surface and the second outer peripheral surface are in contact with each other with a predetermined contact force.

  The second driven roller has a third outer peripheral surface that extends in the second direction and contacts the first outer peripheral surface at a second contact position downstream of the first contact position in the first direction. Further, the second driven roller is not movable relative to the drive roller. The second driven roller follows the rotation of the driving roller while the paper nipped between the first outer peripheral surface and the second outer peripheral surface is nipped between the first outer peripheral surface and the third outer peripheral surface. The paper is conveyed in the first direction by rotating around a third axis parallel to the second direction.

In the paper discharge device described above, when the paper on which the image is formed is discharged, the paper is nipped at both the first contact position and the second contact position, thereby reversing the direction of the curl generated on the paper. Curve the paper in the direction. As a result, the curl generated on the paper on which the image is formed can be removed.
At this time, the first driven roller is urged against the driving roller by the urging member. Thus, the first driven roller can surely nip the sheet by the urging force of the urging member. In addition, since the first driven roller is separable from the driving roller, the first driven roller is displaced downward when the paper curl is strong and the leading edge of the paper hits the first driven roller. Thus, the leading edge of the sheet can be easily guided between the driving roller and the first driven roller.
On the other hand, the second driven roller cannot move relative to the drive roller, and thus generates a stable nip force regardless of the type of paper. That is, the following problems do not occur. The problem is that when the paper is thick, the second driven roller is pushed by the thickness to reduce the nip force of the paper, and conversely, when the paper is thin, the paper is nipped with excessive pressure. .
As described above, the second driven roller generates a constant nip force regardless of the type of the paper while the second driven roller securely nips the paper with the first driven roller. , Can provide a curl removal effect stably.

  The hardness of the driving roller, the first driven roller, and the second driven roller may be set lower in the order of the first driven roller, the driving roller, and the second driven roller. Thus, the second driven roller can nip the paper with a constant force regardless of the type of the paper.

  The length of the second driven roller in the second direction may be shorter than the length of the sheet in the second direction. Thereby, it can avoid that a 2nd driven roller interferes with another member.

  The driving roller may be constituted by a plurality of small rollers arranged at predetermined intervals in the second direction. Thereby, the drive roller does not nip the entire surface of the paper. As a result, it is possible to avoid the nip force of the paper between the driving roller and the other rollers from varying in the second direction and to prevent the paper from being wrinkled when the paper is nipped.

  Among the plurality of small rollers, the lengths of the small rollers arranged at both ends in the second direction may be longer than the lengths of the other small rollers in the second direction. As a result, the side edge of the paper can be brought into contact with the peripheral surface of the drive roller, curling at the side edge of the paper can be reduced, and a decrease in curling correction force at the side edge of the paper can be reduced.

  In the paper discharge device provided in the image forming apparatus, the curl removal effect can be generated stably regardless of the type of paper.

1 is a diagram illustrating a configuration of an image forming apparatus according to a first embodiment. FIG. Sectional drawing which looked at the paper discharge apparatus from the 2nd direction. The figure which shows the state in which the paper was nipped by three rollers.

1. First Embodiment (1) Configuration of Image Forming Apparatus Hereinafter, an image forming apparatus according to a first embodiment will be described. First, the overall configuration of the image forming apparatus 100 will be described with reference to FIG.
The image forming apparatus 100 includes a main body unit 1. The main body 1 forms the main body of the image forming apparatus 100. A paper discharge tray T is formed in a part of the main body 1. A sheet conveyed by a sheet discharge device 4 (described later) is discharged to the sheet discharge tray T.

  The image forming apparatus 100 includes a paper feed cassette 2. The paper feed cassette 2 is disposed below the main body 1 (below the image forming unit 3). In the paper feed cassette 2, paper P that is transported to the image forming unit 3 to form an image is placed. The paper P placed in the paper feed cassette 2 is transported to the first transport path R1 (FIG. 1) by the rotation of the paper feed roller 21 (FIG. 1).

  The image forming apparatus 100 includes an image forming unit 3 inside the main body unit 1. The image forming unit 3 forms an image on the surface of the paper P transported through the first transport path R1 by an electrophotographic method. After forming an image on the paper P, the image forming unit 3 discharges the paper P to the second transport path R2.

  The image forming apparatus 100 includes a paper discharge device 4 inside the main body 1 and above the image forming unit 3. The paper discharge device 4 discharges the paper P, which is transported through the second transport path R2 and has an image formed thereon, from the discharge port E (FIG. 1) to the paper discharge tray T. The configuration of the paper discharge device 4 will be described in detail later. A direction in which the paper P is conveyed from the discharge port E to the paper discharge tray T is referred to as a first direction D1.

  The image forming apparatus 100 includes a control unit 5 inside the main body unit 1. The control unit 5 is a computer system including an integrated circuit (System on Chip) in which an information processing circuit, a signal processing circuit (A / D conversion circuit, D / A conversion circuit, etc.) and a communication circuit are formed on one chip. Yes, each unit of the image forming unit 3 is controlled.

  The image forming apparatus 100 includes an operation panel 6 above the main body 1. The operation panel 6 has a touch panel and various keys, and accepts an input operation by a user or the like. The operation panel 6 includes a display that displays the state of the image forming apparatus 100.

  The image forming apparatus 100 may include an image reading unit 7 above the operation panel 6. The image reading unit 7 is an image scanner, for example, and reads an image from a paper surface or the like. Thereby, the image forming apparatus 100 can realize a copying function for forming an image read from the paper surface on the paper P.

(2) Configuration of Paper Discharging Device Details of the configuration of the paper discharging device 4 will be described below with reference to FIGS.
The paper discharge device 4 has a driving roller 41. The drive roller 41 has a first outer peripheral surface S1 extending in a second direction D2 orthogonal to the first direction D1 for discharging the paper P to the paper discharge tray T, and rotates about the first axis A1.
As shown in FIG. 2, the driving roller 41 includes a plurality of (six in this embodiment) columnar small rollers 41-1, 41-whose center perpendicular to the column axis is penetrated by the first axis A <b> 1. 2, ... 41-6. The small rollers 41-1, 41-2,... 42-6 are rubber cylindrical rollers having a hardness (JIS A) of 60 degrees.

  A pair of both ends of the first axis A1 penetrating the plurality of small rollers 41-1, 41-2, ... 41-6 so that the length direction of the first axis A1 is parallel to the second direction D2. Are rotatably supported by holes provided in the roller fixing members 45a and 45b. One end of the first shaft A1 pivotally supported by the roller fixing members 45a and 45b is connected to an output rotation shaft of a motor (not shown). Thereby, the drive roller 41 rotates around the first axis A1 by the rotation of the motor.

  As shown in FIG. 2, the plurality of small rollers 41-1, 41-2,... 41-6 are arranged at predetermined intervals in a direction parallel to the second direction D <b> 2. Thereby, when these small rollers nip the paper P together with the other rollers, it is possible to suppress the nip force of the paper P from fluctuating in the second direction D2, and as a result, the nip of the paper P is wrinkled. Can be suppressed.

  In addition, among the plurality of small rollers 41-1, 41-2,... 41-6, the length of the small rollers 41-1 and 41-6 arranged at both ends in the second direction D2 in the second direction D2. L1 is set longer than the length L2 in the second direction D2 of the other small rollers 41-2, 41-3, 41-4, and 41-5. As a result, the driving roller 41 can nip the paper P together with the first driven roller 42 (described later), and the side edge (the edge in the second direction D2) of the paper P can follow the driving roller 41. It is possible to reduce a decrease in curl correction force at the side edge of the paper P.

The paper discharge device 4 has a first driven roller 42. The first driven roller 42 extends in the second direction D2, has a second outer peripheral surface S2 that contacts the first outer peripheral surface S1 at the first contact position TP1 (FIG. 3), and can approach or separate from the drive roller 41. Is a roller.
The first driven roller 42 has a structure in which a resin pipe is mounted on the second axis A2 so as to be rotatable around the second axis A2. Further, both ends of the first driven roller 42 in the second direction D2 are an end portion on the roller fixing member 45a side of the small roller 41-6 and an end portion on the roller fixing member 45b side of the small roller 41-1, respectively. Rather than the roller fixing members 45a and 45b. Thereby, it is possible to avoid occurrence of nip marks on the paper P due to the nips at both ends of the first driven roller 42.

Both ends of the second shaft A2 that penetrates the first driven roller 42 are on the side closer to the second transport path R2 below the first shaft A1, and the length direction of the second shaft A2 is the second direction D2. It is pivotally supported by the pair of roller fixing members 45a and 45b so as to be parallel. The second shaft A2 is pivotally supported by a pair of roller fixing members 45a and 45b so as to be movable in a direction approaching or separating from the first shaft A1 of the driving roller 41.
Specifically, for example, both ends of the second shaft A2 are pivotally supported by grooves or holes extending in a direction approaching or separating from the first shaft A1 provided in each of the pair of roller fixing members 45a and 45b. Accordingly, the first driven roller 42 rotates around the second axis A2 and can approach or separate from the driving roller 41.
When approaching the drive roller 41, the surface (second outer peripheral surface S <b> 2) parallel to the cylindrical axis of the first driven roller 42 is the first outer peripheral surface on the side close to the second transport path R <b> 2 below the drive roller 41. Contact S1.

The paper discharge device 4 has an urging member 43. The urging member 43 elastically urges the first driven roller 42 against the drive roller 41 so that the first outer peripheral surface S1 and the second outer peripheral surface S2 are in contact with each other with a predetermined contact force. For example, the urging member 43 is an elastically extendable spring having one end pressed against the second shaft A2 and the other end fixed to the roller fixing members 45a and 45b.
The first driven roller 42 rotates in accordance with the rotation of the drive roller 41 when the first outer peripheral surface S1 of the drive roller 41 and the second outer peripheral surface S2 of the first driven roller 42 come into contact with each other.
Further, the urging member 43 elastically urges the first driven roller 42 so as to be close to the driving roller 41. For example, the curling of the paper P is strong, and the leading edge of the paper P is the first. When the first driven roller 42 hits the first driven roller 42, the first driven roller 42 is displaced downward, and the leading edge of the paper P is easily guided between the driving roller 41 and the first driven roller 42.

The paper discharge device 4 has a second driven roller 44. The second driven roller 44 extends in the second direction D2, and is in contact with the first outer peripheral surface S1 at the second contact position TP2 (FIG. 3) downstream of the first contact position TP1 in the first direction D1. The roller has an outer peripheral surface S3 and cannot move relative to the drive roller 41.
The second driven roller 44 is a sponge cylindrical roller having a hardness (ASKER C) of 30 degrees, in which the center of the surface perpendicular to the cylindrical axis is penetrated by the third axis A3.

Both ends of the third shaft A3 penetrating the second driven roller 44 are closer to the discharge port E (FIG. 1) than the first shaft A1 and the second shaft A2, and the length direction of the third shaft A3 is first. A surface (third outer peripheral surface S3) parallel to the two directions D2 and parallel to the cylindrical axis of the second driven roller 44 contacts the first outer peripheral surface S1 with a predetermined contact force, and the third axis A3. And the first shaft A1 are rotatably supported in holes provided in the pair of roller fixing members 45a and 45b so that the distance between the first shaft A1 and the first shaft A1 does not change.
As a result, the second driven roller 44 rotates around the third axis A <b> 3 according to the rotation of the driving roller 41 without moving relative to the driving roller 41.

As shown in FIG. 2, the vicinity of the roller fixing members 45 a and 45 b on the third axis A <b> 3 is thinner than the other shaft portions in order to avoid interference with other members of the image forming apparatus 100. Accordingly, the length of the second driven roller 44 in the second direction D2 is shorter than the length of the paper P in the second direction D2.
Further, as described above, the length L1 in the second direction D2 of the small rollers 41-1 and 41-6 disposed at both ends in the second direction D2 is equal to the other small rollers 41-2, 41-3, and 41. -4 and 41-5 are set to be longer than the length L2 in the second direction D2. Thus, even if the second driven roller 44 is shorter than the length of the paper P in the second direction D2, the side edge of the paper P can be brought into contact with the peripheral surface of the drive roller 41, and the side edge of the paper P In addition to reducing curling at the edges, it is possible to reduce the decrease in curl correction force at the side edges of the paper P.

(3) Operation of Image Forming Apparatus Next, an operation from the image forming apparatus 100 having the above-described configuration until an image is formed on the paper P and discharged onto the paper discharge tray T will be described.
When it is instructed to form an image on the paper P by operating the operation panel 6 or communicating from the outside, the control unit 5 rotates the paper feed roller 21 and is placed on the paper feed cassette 2. The paper P is transported to the image forming unit 3 via the first transport path R1.

  When the paper P is conveyed to the image forming unit 3, image formation on the paper P is started. Specifically, first, the image forming unit 3 forms an electrostatic latent image corresponding to an image to be printed on the surface of the photosensitive drum 31 (FIG. 1) under the control of the control unit 5. Next, the toner supply device 32 (FIG. 1) supplies toner to the photosensitive drum 31. As a result, toner adheres to the surface of the photosensitive drum 31 so as to correspond to the image (electrostatic latent image) to be printed. Thereafter, while the conveyed paper P passes through the surface of the photosensitive drum 31, the toner attached to the photosensitive drum 31 is transferred onto one surface of the paper P.

  After transferring the toner onto the paper P, the fixing device 33 (FIG. 1) heats the surface of the paper P on which the toner has been transferred, so that the toner is fixed onto the paper P. At this time, moisture evaporates from the heated surface of the paper P. As a result of shrinkage of the heated surface of the paper P due to evaporation of moisture from the paper P, the paper P curls with the surface on which the image is formed by fixing the toner. Of the curls of the paper P generated in the toner fixing process, the curl whose side on which the image is fixed is the inner side (concave surface) is called an image curl.

The sheet P conveyed through the second conveyance path R2 and reaching the first contact position TP1 is formed between the first outer peripheral surface S1 of the driving roller 41 and the second outer peripheral surface S2 of the first driven roller 42 at the first contact position TP1. Nipped in between and conveyed in the first direction D1.
Thereafter, when the sheet P reaches the second contact position TP2 on the downstream side in the first direction D1, the second driven roller 44 and the first outer peripheral surface S1 of the drive roller 41 are in contact with the first outer peripheral surface S1 as shown in FIG. The paper P nipped between the second outer peripheral surface S2 of the driven roller 42 is further nipped between the first outer peripheral surface S1 and the third outer peripheral surface S3 at the second contact position TP2. FIG. 4 is a diagram illustrating a state where a sheet is nipped by three rollers.

  When the sheet P is nipped by the three rollers at both the first contact position TP1 and the second contact position TP2, the sheet P has a surface opposite to the surface on which the image is formed (the sheet P in FIG. 4). Is arranged so as to follow the curvature of the first outer peripheral surface S1 of the drive roller 41. That is, the paper P nipped by the three rollers is bent in the direction opposite to the image curl direction. By curving the paper P in the direction opposite to the image curl, the three rollers can remove the image curl generated on the paper P.

At this time, the first driven roller 42 nips the paper P while being urged against the driving roller 41 by the urging member 43. Thereby, the first driven roller 42 can reliably nip the paper P by the urging force of the urging member 43.
On the other hand, since the second driven roller 44 does not move relative to the drive roller 41, the second driven roller 44 generates a stable nip force regardless of the type of the paper P. That is, when the paper P is thick, the second driven roller 44 is pushed by the thickness and the nip force of the paper P does not decrease. Conversely, when the paper P is thin, the paper P is pressed with excessive pressure. Do not nip.
As described above, the paper discharge device 4 is configured to reliably nip the paper P from the first driven roller 42 while the second driven roller 44 generates a constant nip force regardless of the type of the paper P. A constant curl removal effect can be imparted to any type of paper P.

  The hardness of the driving roller 41, the first driven roller 42, and the second driven roller 44 is decreased in the order of the first driven roller 42, the driving roller 41, and the second driven roller 44. Thus, the second driven roller 44 can nip the paper P with a constant nip force regardless of the type of the paper P.

  As the first driven roller 42 and the second driven roller 44 rotate according to the rotation of the driving roller 41, the paper P nipped by the three rollers is removed from the first curl while the image curl generated on the paper P is removed. The paper is conveyed in the direction D1, and is finally discharged from the discharge port E to the discharge tray T.

(4) Configuration and Function of Embodiment The first embodiment has the following configuration and function.
A paper discharge device (for example, the paper discharge device 4) is provided in an image forming device (for example, the image forming device 100) that forms an image on a paper (for example, paper P), and discharges the paper on which the image has been formed to the outside. . The paper discharge device includes a driving roller (for example, driving roller 41), a first driven roller (for example, first driven roller 42), a biasing member (for example, biasing member 43), and a second driven. A roller (for example, a second driven roller 44).
The driving roller has a first outer peripheral surface (for example, a first outer peripheral surface S1) extending in a second direction (for example, the second direction D2) orthogonal to a first direction (for example, the first direction D1) for discharging the paper to the outside. ). The drive roller is rotatable around a first axis (for example, the first axis A1) parallel to the second direction.
The first driven roller has a second outer peripheral surface (for example, a second outer peripheral surface S2) that extends in the second direction and contacts the first outer peripheral surface at a first contact position (for example, the first contact position TP1). The first driven roller is a roller that can approach and separate from the drive roller. The first driven roller has a second axis (for example, second axis A2) parallel to the second direction according to the rotation of the driving roller in a state where the sheet is nipped between the first outer peripheral surface and the second outer peripheral surface. By rotating around, the paper is conveyed in the first direction.
The biasing member elastically biases the first driven roller against the drive roller so that the first outer peripheral surface and the second outer peripheral surface are in contact with each other with a predetermined contact force.

  The second driven roller extends in the second direction, and contacts the first outer peripheral surface at a second contact position (for example, the second contact position TP2) downstream of the first contact position in the first direction. It has a surface (for example, third outer peripheral surface S3). Further, the second driven roller is not movable relative to the drive roller. The second driven roller follows the rotation of the driving roller while the paper nipped between the first outer peripheral surface and the second outer peripheral surface is nipped between the first outer peripheral surface and the third outer peripheral surface. The paper is conveyed in the first direction by rotating around a third axis parallel to the second direction.

(5) Other Embodiments Although one or more embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. It is. In particular, a plurality of embodiments and modifications described in this specification can be arbitrarily combined as necessary.

(A) The decurling mechanism in the paper discharge device 4 according to the first embodiment, that is, the driving roller 41, the first driven roller 42, and the second driven roller 44 can convey the paper P in the second direction D2. It may be incorporated in the shift sorter mechanism. Thereby, the compact paper discharge device 4 having both the shift sorter function and the decurling function can be realized.

(B) A belt having a predetermined width in the second direction D2 may be disposed so as to bridge the first driven roller 42 and the second driven roller 44. The outer peripheral surface of the belt is in close contact with the first outer peripheral surface S1 of the drive roller 41, and the leading end of the sheet is reliably guided from the first contact position TP1 to the second contact position TP2.
Accordingly, the paper P nipped at the first contact position TP1 can be reliably moved to the second contact position TP2 without moving in a direction different from the second contact position TP2. As a result, the sheet P can be securely nipped at the second contact position TP2.

  The present invention can be widely applied to a paper discharge device provided in an image forming apparatus.

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 1 Main body part 2 Paper feed cassette 21 Paper feed roller 3 Image forming part 31 Photosensitive drum 32 Toner supply device 33 Fixing device 4 Paper discharge device 41 Driving roller 41-1, 41-2, 41-3 Small roller 41-4, 41-5, 41-6 Small roller 42 First driven roller 43 Energizing member 44 Second driven roller 45a, 45b Roller fixing member 5 Control unit 6 Operation panel 7 Image reading unit A1 First axis A2 Second axis A3 Third axis D1 First direction D2 Second direction E Discharge port P Paper R1 First transport path R2 Second transport path S1 First outer peripheral surface S2 Second outer peripheral surface S3 Third outer peripheral surface T Discharge tray TP1 1st contact position TP2 2nd contact position

Claims (5)

A paper discharge device that is provided in an image forming apparatus that forms an image on paper and discharges the paper on which the image has been formed to the outside.
A drive roller having a first outer peripheral surface extending in a second direction orthogonal to a first direction for discharging the paper to the outside and rotatable about a first axis parallel to the second direction;
A roller having a second outer peripheral surface extending in the second direction and in contact with the first outer peripheral surface at a first contact position and capable of approaching and moving away from the driving roller; and the first outer peripheral surface and the second outer peripheral surface The paper is transported in the first direction by rotating around a second axis parallel to the second direction in accordance with the rotation of the drive roller in a state where the paper is nipped between the first and second surfaces. A driven roller;
A biasing member that resiliently biases the first driven roller against the drive roller so that the first outer circumferential surface and the second outer circumferential surface are in contact with each other with a predetermined contact force;
A third outer peripheral surface extending in the second direction and in contact with the first outer peripheral surface at a second contact position downstream of the first contact position in the first direction and relative to the drive roller; The driving roller in a state in which the sheet nipped between the first outer peripheral surface and the second outer peripheral surface is nipped between the first outer peripheral surface and the third outer peripheral surface. A second driven roller that conveys the paper in the first direction by rotating around a third axis parallel to the second direction according to the rotation of
A paper discharge device.   2. The exhaust according to claim 1, wherein hardness of the driving roller, the first driven roller, and the second driven roller is lower in the order of the first driven roller, the driving roller, and the second driven roller. Paper device.   3. The paper discharge device according to claim 1, wherein a length of the second driven roller in the second direction is shorter than a length of the paper in the second direction.   The paper discharge device according to any one of claims 1 to 3, wherein the driving roller is configured by a plurality of small rollers arranged at predetermined intervals in the second direction. Of the plurality of small rollers, the length of the small rollers disposed at both ends in the second direction is longer than the length of the other small rollers in the second direction.
The paper discharge device according to claim 4.

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