JP2016185872A - Sheet conveyance device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress disturbance of the attitude of a sheet generated until a sheet corrected in attitude reaches a sheet conveyance member.SOLUTION: A first butting section 781 is disposed just in front of a first conveyance roll 44. In this case, a sheet P is guided by a butting section 78 just before the sheet P advances in the first conveyance roll 44, and inclination of the sheet P is reduced when the sheet P advances in the first conveyance roll 44. When a length of a side edge PS of the sheet P is L1 and a separation distance between the first butting section 781 located on the most downstream side and the first conveyance roll 44 to be a conveyance member is L2, it is preferable that the first butting section 781 is installed at a portion where a relationship L2<(1/3)*L1 is established.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a sheet conveying device and an image forming apparatus.

  Patent Document 1 includes a side guide disposed along the sheet conveyance direction on one side of the conveyance path, and a skew roll disposed adjacent to the side guide and aligned along the conveyance path. An attitude correction device is disclosed.

JP 2014-12666 A

The posture of the paper can be corrected by abutting the side of the paper against a plurality of paper abutting portions arranged along the paper conveyance path. However, if there is a distance between the position where the posture of the sheet is corrected and the sheet conveying member positioned on the downstream side, the posture of the sheet may be disturbed again.
SUMMARY OF THE INVENTION An object of the present invention is to suppress a disturbance in the posture of a sheet that occurs until the sheet whose posture has been corrected reaches a sheet conveying member.

According to the first aspect of the present invention, the sheet is conveyed on the side of the conveyance path and arranged side by side along the conveyance path, and the side of the sheet on the conveyance path is Using a plurality of paper abutting portions to be abutted and a plurality of paper conveying means provided with positions shifted in the paper conveyance direction, the paper on the conveyance path is moved toward the paper abutting portion. An abutting unit that abuts the side of the sheet against the sheet abutting unit, and a sheet conveying member that is provided downstream of the plurality of sheet conveying units and conveys the sheet to the downstream side, A sheet provided with one or more sheet abutting portions on the downstream side of the sheet conveying means located on the most downstream side of the plurality of sheet conveying means and on the upstream side of the sheet conveying member. It is a transport device.
According to a second aspect of the present invention, the length of the side of the smallest size paper that can be transported by the paper transport device is L1, and the paper that is located on the most downstream side of the plurality of paper abutting portions. When the separation distance between the abutting portion and the sheet conveying member is L2, the sheet abutting portion located on the most downstream side at a position where the relationship of L2 <(1/3) * L1 is established. The sheet conveying device according to claim 1, wherein
According to a third aspect of the present invention, there is provided 2 downstream of the sheet transporting unit positioned second most from the sheet transporting unit positioned on the most downstream side of the plurality of sheet transporting units. The paper conveying apparatus according to claim 1, wherein one or more paper abutting portions are installed.
According to a fourth aspect of the present invention, there is provided the paper conveying device according to any one of the first to third aspects, wherein the paper abutting portion is constituted by a rotatable rotating member.
According to a fifth aspect of the present invention, the sheet abutting portion is formed with an inclined surface that lifts upward a portion of the sheet that has abutted against the sheet abutting portion. 4. The sheet conveying device according to claim 4.
According to a sixth aspect of the present invention, an image forming unit that forms an image on a sheet, a conveyance path through which the sheet toward the image forming unit passes, and a side of the conveyance path and along the conveyance path Using a plurality of paper abutting portions that are arranged side by side and abutted against the sides of the paper on the conveyance path, and a plurality of paper conveying means provided with their positions shifted in the paper conveyance direction, An abutting means for moving the paper on the path toward the paper abutting section and abutting a side of the paper against the paper abutting section; and provided downstream of the plurality of paper conveying means, A sheet conveying member that conveys the sheet to the downstream side, and located downstream of the sheet conveying means located on the most downstream side of the plurality of sheet conveying means and upstream of the sheet conveying member. One or more Serial is a sheet image forming apparatus abutting portion is provided.

According to the first aspect of the present invention, the posture is corrected as compared with the case where the sheet abutting portion is not provided on the downstream side of the sheet conveying unit located on the most downstream side and on the upstream side of the sheet conveying member. Disturbance of the posture of the paper that occurs until the paper reaches the paper transport member can be suppressed.
According to the second aspect of the present invention, compared with the case where the paper abutting portion located on the most downstream side is installed at a location where the relationship of L2 <(1/3) * L1 is not established, Disturbance can be further suppressed.
According to the third aspect of the present invention, it is possible to more reliably correct the posture of the sheet as compared with the case where the number of the sheet abutting portions disposed on the downstream side of the second sheet conveying unit is less than two. It can be carried out.
According to the invention of claim 4, the paper can be moved more smoothly than in the case where the paper abutting portion does not rotate.
According to the invention of claim 5, it is possible to suppress the sagging of the paper as compared with the case where the inclined surface is not provided in the paper abutting portion.
According to the sixth aspect of the present invention, the posture is corrected as compared with the case where the sheet abutting portion is not provided on the downstream side of the sheet conveying means located on the most downstream side and on the upstream side of the sheet conveying member. Disturbance of the posture of the paper that occurs until the paper reaches the paper transport member can be suppressed.

FIG. 3 is a diagram when the image forming apparatus is viewed from the front side. FIG. 2 is a diagram when a first paper transport path is viewed from the direction of arrow II in FIG. 1. It is a figure at the time of seeing a 3rd conveyance roll from the arrow III direction in FIG. It is a figure at the time of seeing a butting part from the arrow IV direction of FIG. It is a figure explaining a motion of paper. It is a figure explaining a motion of paper. It is the figure which showed the butting part in a comparative example. It is a figure at the time of seeing a downstream conveyance roll etc. from the arrow VIII direction in FIG. It is the figure which showed the other structural example. It is the figure which showed the other structural example.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram of an image forming apparatus 100 to which the exemplary embodiment is applied as viewed from the front side.
The image forming apparatus 100 is provided with a plurality of image forming units 10 (10Y, 10M, 10C, 10K) that form toner images of respective color components by electrophotography.
Further, the image forming apparatus 100 includes a central processing unit (CPU), a read only memory (ROM), and the like, and includes a device that configures the image forming apparatus 100 and a control unit 80 that controls the operation of each unit. It has been.

  In addition, the image forming apparatus 100 is provided with a user interface unit (UI) 90. The user interface unit 90 is configured by a display panel, and outputs an instruction received from the user to the control unit 80 and displays information from the control unit 80 to the user.

Further, in the image forming apparatus 100, the toner image on the intermediate transfer belt 20 with respect to the intermediate transfer belt 20 and the paper P on which the respective color component toner images formed by the respective image forming units 10 are sequentially transferred (primary transfer). Is provided with a secondary transfer device 30 for batch transfer (secondary transfer).
Here, each of the image forming units 10, the intermediate transfer belt 20, and the secondary transfer device 30 can be regarded as an image forming unit that forms an image on the paper P.

  The image forming apparatus 100 also includes a first paper transport path R1 through which the paper P transported toward the secondary transfer device 30 passes, and a second paper through which the paper P after passing through the secondary transfer device 30 passes. A third paper transport path R3 is provided which branches from the transport path R2 and the second paper transport path R2 and extends below the first paper transport path R1.

Further, a reversing mechanism 500 is provided that transports the paper P from the third paper transport path R3 to the first paper transport path R1 and reverses the front and back of the paper P. An opening 102 is formed in the housing 101 of the image forming apparatus 100.
The paper P transported along the second paper transport path R2 is discharged to the outside of the housing 101 through the opening 102 and is stacked on a paper stacking unit (not shown). A processing device (not shown) may be provided adjacent to the housing 101 to further perform processing such as punching the paper P discharged from the opening 102.

Further, a first paper supply device 410 and a second paper supply device 420 that supply paper P to the first paper transport path R1 are provided.
The first paper supply device 410 and the second paper supply device 420 are configured in the same manner. Each of the first paper supply device 410 and the second paper supply device 420 includes a paper storage unit 41 that stores the paper P, A take-out roll 42 that takes out and transports the paper P stored in the paper storage unit 41 is provided.

On the upstream side of the secondary transfer device 30, a first transport roll (registration roll) 44 that transports the paper P on the first paper transport path R <b> 1 toward the secondary transfer device 30 is provided. This 1st conveyance roll 44 is comprised by a pair of roll-shaped member.
The first transport roll 44 stops the paper P at one end, and transports the paper P toward the secondary transfer device 30 at a predetermined timing.
Furthermore, an abutting portion 78 is provided on the upstream side of the first transporting roll 44 so that the side of the paper P transported on the first paper transporting path R1 is abutted. The abutting portion 78 is provided on one side (one side) of the first paper transport path R1.

Further, a second transport roll (alignment roll) 45 is provided on the front side in the drawing with respect to the abutting portion 78 (on the near side with respect to the abutting portion 78 in the depth direction of the image forming apparatus 100).
The second transport roll 45 that functions as an abutting unit conveys the paper P to the downstream side, moves the paper P toward the abutting portion 78, and abuts the side of the paper P against the abutting portion 78. Hit it. Similar to the first transport roll 44, the second transport roll 45 is also composed of a pair of roll-shaped members.

  Further, on the upstream side of the second transport roll 45, a third transport roll (pre-alignment roll) 46 for transporting the paper P to the downstream side and rotating (inclining) the paper P is provided. A fourth transport roll 47 that transports the paper P toward the third transport roll 46 is provided on the upstream side of the third transport roll 46. The 3rd conveyance roll 46 and the 4th conveyance roll 47 are also comprised by a pair of roll-shaped member.

Here, the location where the first transport roll 44 to the fourth transport roll 47 are provided has a function of transporting the paper P, and the first transport roll 44 to the fourth transport roll 47 are provided. The location can be understood as a paper transport device.
In the present embodiment, in addition to these transport rolls, the first paper transport path R1, the second paper transport path R2, and the third paper transport path R3 include sheets positioned on these paper transport paths. A plurality of transport rolls 48 for transporting P are provided.

A fixing device 50 that fixes an image secondarily transferred onto the paper P by the secondary transfer device 30 to the paper P is provided on the second paper transport path R2.
Further, between the secondary transfer device 30 and the fixing device 50, a transport device 51 that transports the paper P that has passed through the secondary transfer device 30 to the fixing device 50 is provided. The conveying device 51 has a belt 51A that moves around, and conveys the paper P by placing the paper P on the belt 51A.

The fixing device 50 is provided with a heating roll 50A that is heated by a built-in heater (not shown) and a pressing roll 50B that presses the heating roll 50A.
In the fixing device 50, the paper P is pressurized and heated by passing the paper P between the heating roll 50A and the pressing roll 50B. As a result, the image on the paper P is fixed on the paper P.

Each of the image forming units 10 is provided with a rotatable photosensitive drum 11. Further, around the photosensitive drum 11, a charging device 12 that charges the photosensitive drum 11, an exposure device 13 that exposes the photosensitive drum 11 to write an electrostatic latent image, and an electrostatic latent image on the photosensitive drum 11 Is provided with a developing device 14 that visualizes the toner with a toner.
Further, a primary transfer device 15 that transfers each color component toner image formed on the photosensitive drum 11 to the intermediate transfer belt 20 and a drum cleaning device 16 that removes residual toner on the photosensitive drum 11 are provided.

  The intermediate transfer belt 20 is provided so as to be stretched over the three roll members 21 to 23. Of these three roll members 21 to 23, the roll member 22 drives the intermediate transfer belt 20. The roll member 23 is disposed opposite to the secondary transfer roll 31 with the intermediate transfer belt 20 in between, and the secondary transfer roll 30 and the roll member 23 constitute a secondary transfer device 30. A belt cleaning device 24 for removing residual toner on the intermediate transfer belt 20 is provided at a position facing the roll member 21 with the intermediate transfer belt 20 interposed therebetween.

In the image forming apparatus 100 according to the present embodiment, an image can be formed on one side of the paper P supplied from the first paper supply device 410 and the like, and an image can be formed on the other side of the paper P. be able to.
More specifically, in this image forming apparatus 100, the front and back of the paper P that has passed through the fixing device 50 are reversed by the reversing mechanism 500, and the paper P with the front and back reversed is conveyed to the secondary transfer device 30 again. The Then, the image is transferred to the other surface of the paper P by the secondary transfer device 30. Thereafter, the sheet P passes through the fixing device 50 again, and the transferred image is fixed on the sheet P. As a result, an image is formed not only on one side of the paper P but also on the other side.

In the reversing mechanism 500, first, the paper P on the third paper transport path R3 moves to the front side of the image forming apparatus 100, for example, in a direction orthogonal to the direction in which the third paper transport path R3 extends. This movement is performed by a dedicated transport roll (not shown).
At this time, the transport roll 48 (the transport roll 48 installed in the reversing mechanism 500) on the third paper transport path R3 is in a separated state.

  The sheet P moved in the orthogonal direction is guided upward by a guide member (not shown) having a substantially C-shaped cross section, for example. Further, a transport roll (not shown) that transports the paper P upward is provided, and the paper P further moves upward by the transport roll.

Thereafter, the paper P moves from the side of the first paper transport path R1 to the first paper transport path R1. At this time, the transport roll 48 (the transport roll 48 installed in the reversing mechanism 500) on the first paper transport path R1 is separated.
Next, the paper P is nipped by the transport roll 48 and the transport roll 48 rotates. As a result, the reversed paper P is directed to the secondary transfer device 30.

FIG. 2 is a view when the first paper transport path R1 is viewed from the direction of arrow II in FIG.
As shown in FIG. 2 and as described above, in the present embodiment, the first sheet transporting the sheet P on the first sheet transport path R1 toward the secondary transfer device 30 (see FIG. 1). A transport roll (registration roll) 44 is provided.

Further, an abutting portion 78 that abuts the side PS of the sheet P on the first sheet conveying path R1 is provided on one side SR (rear side) of the first sheet conveying path R1. Yes.
A plurality of abutting portions 78 are provided. The abutting portion 78 is arranged side by side along the first paper transport path R1. Each of the abutting portions 78 is formed of a rotating member that is formed in a columnar shape and rotates around a rotation shaft 78E, and can rotate in the circumferential direction (the direction indicated by the arrow 2A).

  In the present embodiment, the paper P moves to the downstream side in a state where the paper P abuts against the abutting portion 78 (details will be described later). At this time, if the abutting portion 78 is rotatable, the paper P moves more smoothly. Each abutting portion 78 is supported by a support member 76 disposed below the abutting portion 78.

At a position facing the abutting portion 78, the paper P is transported to the downstream side and the paper P is transported toward the abutting portion 78, and the side PS of the paper P is set against the abutting portion 78. A second transport roll (alignment roll) 45 to be abutted is provided. A plurality (three in this embodiment) of the second transport rolls 45 are provided.
Each of the second transport rolls 45 is disposed in an inclined state. Specifically, the rotation axis RG of the second transport roll 45 is inclined with respect to the direction orthogonal to the direction in which the first paper transport path R1 extends.

Each of the three second transport rollers 45 provided has a function of transporting the paper P, and can be regarded as a paper transport means.
Further, each of the three second transport rollers 45 provided is shifted in position in the transport direction (left and right direction in the drawing) of the paper P. As a result, one of the three second transport rolls 45 is located on the most downstream side. The other one is located second from the second conveying roll 45 located on the most downstream side to the upstream side. The other one is located on the most upstream side.

  Hereinafter, in this specification, the 2nd conveyance roll 45 located in the most downstream side is called the downstream conveyance roll 451. FIG. Further, the second transport roll 45 located second from the downstream transport roll 451 upstream is referred to as an intermediate transport roll 452. Further, the second transport roll 45 located on the most upstream side is referred to as an upstream transport roll 453.

The relationship between the abutting portion 78, the downstream side transport roll 451, the intermediate transport roll 452, and the upstream side transport roll 453 will be described.
In the present embodiment, two abutting portions 78 are provided at positions opposed to the downstream side transport roll 451. Hereinafter, in this specification, the abutting portion 78 located on the downstream side of the two abutting portions 78 is referred to as a first abutting portion 781, and the abutting portion 78 located on the upstream side is referred to as a second abutting portion. Part 782 will be referred to.

Further, one abutting portion 78 (hereinafter referred to as “third abutting portion 783”) is provided at a position facing the intermediate transport roll 452. Further, an abutting portion 78 (hereinafter referred to as a “fourth abutting portion 784”) is also provided at a position facing the upstream-side transport roll 453.
In the present embodiment, a first butting portion 781 and a second butting portion 782 are provided on the downstream side of the intermediate transport roll 452 that is second from the downstream side. That is, in the present embodiment, two abutting portions 78 are provided on the downstream side of the intermediate transport roll 452.

The third transport roll (pre-alignment roll) 46 is composed of a pair of roll-shaped members 461 and 462, as shown in FIG. 3 (the view when the third transport roll 46 is viewed from the direction of arrow III in FIG. 2). ing.
Each of the roll-shaped members 461 and 462 includes a rotating shaft 463 and two roll members 81 and 82 attached to the rotating shaft 463.

In this embodiment, the diameter of the roll member 81 is larger than the diameter of the roll member 82, and the peripheral speed of the roll member 81 is larger than the peripheral speed of the roll member 82.
Thereby, in this embodiment, when the paper P passes the 3rd conveyance roll 46, the paper P rotates (it mentions later for details).

FIG. 4 is a view when the butting portion 78 (fourth butting portion 784) is viewed from the direction of arrow IV in FIG.
Each of the abutting portions 78 is formed in a cylindrical shape. Further, as shown in FIG. 4, the butting portion 78 is provided with a recess 780 </ b> A that is recessed from the outer peripheral surface of the butting portion 78 to the inside of the butting portion 78. The recess 780A has a V-shaped cross section.

Accordingly, the abutting portion 78 is provided with a first inclined surface 780B rising from below toward the bottom 780E of the recess 780A, and a second inclined surface 780C falling from above toward the bottom 780E.
Here, as shown in FIG. 4, the leading edge PF of the sheet P in the middle of conveyance may hang down. In the present embodiment, in this case, the tip PF hits the first inclined surface 780B, and the tip PF is lifted upward by the first inclined surface 780B.

The movement of the paper P will be described with reference to FIGS. 5 and 6 (a diagram illustrating the movement of the paper P).
5 and 6, the longest side when conveying the smallest size paper P (the smallest size paper P defined in the product specifications) that can be conveyed by the image forming apparatus 100 is shown. The movement of the sheet P when the sheet P is conveyed at the top is shown.

  As shown in FIG. 5A, in this embodiment, when the paper P is transported to the third transport roll 46, the paper P rotates. Thereby, in this embodiment, the front end PF of the paper P faces the other side SF of the first paper transport path R1.

  Thereafter, as shown in FIG. 5B, the paper P reaches the intermediate transport roll 452 and the upstream transport roll 453, and the paper P is transported by the intermediate transport roll 452 and the upstream transport roll 453. The intermediate transport roll 452 and the upstream transport roll 453 are inclined with respect to the direction in which the first paper transport path R1 extends, and the paper P moves toward the butting portion 78 while moving downstream. To do.

  Thereafter, as shown in FIG. 6A, the paper P reaches the downstream side transport roll 451 and is transported by the downstream side transport roll 451 and the intermediate transport roll 452. In the present embodiment, as shown in FIG. 6A, the side PS of the paper P is abutted against the abutting portion 78. Specifically, the side PS of the paper P is abutted against the first butting portion 781 to the third butting portion 783.

Here, when the side PS of the paper P is abutted against the abutting portion 78, the side PS of the paper P is in a state along the first paper transport path R1. In other words, the paper P is along the one direction in which the first paper transport path R1 extends, and the paper P is not inclined.
Thereby, in this embodiment, it is difficult to cause problems such as an image formed on the paper P being inclined with respect to the side PS of the paper P.

Although not described above, in the present embodiment, since the sheet P is rotated as described above, when the sheet P abuts against the abutting portion 78, the rear end PB of the sheet P (FIG. 5). (See (B)) The side comes into contact with the abutting portion 78 before the tip PF side.
As a result, in the present embodiment, the paper P is less likely to be damaged as compared to the case where the front end PF side of the paper P contacts the abutting portion 78 earlier than the rear end PB side.

Thereafter, in the present embodiment, as shown in FIG. 6B, the trailing edge PB of the paper P passes through the intermediate transport roll 452, and the paper P is transported downstream by the downstream transport roll 451.
Thereafter, the sheet P passes through the first conveying roll 44 and proceeds to the secondary transfer device 30 (see FIG. 1).

FIG. 7 is a view showing the abutting portion 78 in the comparative example.
In this comparative example, the first butting portion 781 provided in the present embodiment is not provided. Accordingly, in this comparative example, only one abutting portion 78 (second abutting portion 782) is provided on the downstream side of the intermediate transport roll 452 that is positioned second from the downstream side toward the upstream side. It is the composition which was made.

Here, when there is only one abutting portion 78 provided on the downstream side of the intermediate transport roll 452, the behavior of the paper P becomes unstable, and the paper P tends to be inclined.
In the present embodiment, when the paper P passes through the intermediate transport roll 452, the paper P is transported by only one downstream transport roll 451 thereafter. In such a case, compared with the case where the paper P is transported by the two transport rolls of the downstream-side transport roll 451 and the intermediate transport roll 452, the number of locations where the paper P is nipped is reduced and the paper P is easily rotated.

Further, when only one abutting portion 78 is provided on the downstream side of the intermediate transport roll 452, when the paper P that has passed through the intermediate transport roll 452 hits this one abutting portion 78. The sheet P is easy to rotate around the one abutting portion 78.
As a result, in this comparative example, when the paper P is removed from the intermediate transport roll 452, the paper P is easily rotated, and the paper P is likely to be inclined.

On the other hand, in the present embodiment, there are two locations where the paper P that has passed through the intermediate transport roll 452 abuts, the first butting portion 781 and the second butting portion 782.
In this case, the paper P is supported by the two butting portions 78 and the downstream-side transport roll 451 and is supported at three locations. As a result, in the present embodiment, the rotation of the paper P is suppressed, and the inclination of the paper P hardly occurs.

Although not described above, in the present embodiment, as shown in FIG. 6A, the setting interval D1 of the abutting portion 78 is the side of the paper P (the smallest size paper P that can be transported). It is smaller than the length L1 of PS (the length L1 of the short side).
Further, a separation distance D2 between the first abutting portion 781 located on the most downstream side and the first conveying roll 44 as an example of a conveying member (the paper nip between the first abutting portion 781 and the first conveying roll 44). The separation distance D2) between the paper and the paper is also smaller than the length L1 of the side PS of the paper P.
As a result, the paper P is less likely to enter between the adjacent butting portions 78 or between the first butting portion 781 and the first transport roll 44, and the transport of the paper P is more stably performed.

Further, as shown in FIG. 2, in the present embodiment, the first abutting portion 781 is located on the downstream side of the downstream side transport roll 451 that is the paper transport unit located on the most downstream side, and further, It is located upstream from the transport roll 44.
Accordingly, the posture of the paper P when the paper P reaches the first transport roll 44 is compared with a configuration in which the abutting portion 78 is not provided between the downstream transport roll 451 and the first transport roll 44. The sheet P reaches the first transport roll 44 in a state where the sheet P is stable and the inclination of the sheet P is suppressed.

In the comparative example shown in FIG. 7, the abutment portion 78 is not provided between the downstream side transport roll 451 and the first transport roll 44, and immediately before the paper P reaches the first transport roll 44, The paper P is in a state of being easily inclined (a state in which the posture of the paper P is easily disturbed).
If the abutment portion 78 is provided between the downstream-side transport roll 451 and the first transport roll 44 as in the present embodiment, this inclination is unlikely to occur, and the first transport roll is in a state where the paper P is straighter. 44 is reached.

In addition, when the abutting part 78 is provided between the downstream-side transport roll 451 and the first transport roll 44, the view of the downstream-side transport roll 451 and the like in the direction of arrow VIII in FIG. As shown in (A), the behavior of the paper P is stable even in the height direction, and the paper P is prevented from reaching the first transport roll 44 in a state in which the front end PF of the paper P hangs down.
In the present embodiment, as described above, the first inclined surface 780B (see FIG. 4) for lifting the front end PF of the paper P is provided, and when the front end PF of the paper P hangs down, the front end PF is lifted, and the front end PF The sheet P is suppressed from reaching the first transport roll 44 in the state where the paper hung down.

  Here, as shown in FIG. 8B, if the abutting portion 78 is not provided between the downstream-side transport roll 451 and the first transport roll 44, the leading edge PF of the paper P hangs down. The paper P easily reaches the first transport roll 44.

FIG. 9 is a diagram showing another configuration example.
In this configuration example, the position of the first abutting portion 781 is positioned on the downstream side of the configuration example shown above. In other words, the first abutting portion 781 is disposed immediately before the first transport roll 44.
In this case, the paper P is guided by the abutting portion 78 until just before the paper P enters the first transport roll 44, and the inclination of the paper P when the paper P enters the first transport roll 44 is further reduced.

  Note that the length of the side (short side) PS of the paper P (the smallest size paper P that can be transported) is L1, the first abutting portion 781 located on the most downstream side, and the first transport that is a transport member. When the distance from the roll 44 (the paper nip portion thereof) is L2, the first abutting portion 781 may be installed at a location where the relationship L2 <(1/3) * L1 is established. preferable.

  The inventor determines the inclination of the sheet P between the case where the first abutting portion 781 is installed at a place where the relational expression is satisfied and the case where the first abutting portion 781 is installed at a place where the relational expression is not satisfied. Compared. As a result, the inclination of the paper P is smaller when the first abutting portion 781 is installed at a location where the relational expression is satisfied than when the first abutting portion 781 is installed at a location where the relational expression is not satisfied. There was found.

  In the configuration example shown in FIG. 9, immediately after the sheet P is removed from the intermediate transport roll 452 (see reference numeral 11A), the sheet P is supported by only the second abutting portion 782. . For this reason, as a more preferable configuration example, the configuration example shown in FIG. 10 (a diagram showing another configuration example) can be given.

In the configuration example shown in FIG. 10, in addition to the first butting portion 781 to the fourth butting portion 784, a fifth butting portion 785 is provided on the downstream side of the first butting portion 781.
In this configuration example, immediately after the sheet P passes through the intermediate transport roll 452, the sheet P is supported by the two butting portions 78 of the first butting portion 781 and the second butting portion 782. In this configuration example, the paper P is further supported by the fifth abutting portion 785 immediately before the first transport roll 44.

DESCRIPTION OF SYMBOLS 10 ... Each image forming unit, 20 ... Intermediate transfer belt, 30 ... Secondary transfer apparatus, 44 ... 1st conveyance roll, 45 ... 2nd conveyance roll, 78 ... Abutting part, 100 ... Image forming apparatus, 451 ... Downstream side Conveying roll, 452 ... Intermediate conveying roll, 453 ... Upstream conveying roll, 780B ... First inclined surface, D1 ... Installation interval, P ... Paper, PS ... Side, R1 ... First paper conveying path, SR ... One side Direction

Claims (6)

A transport path through which paper is transported, and
A plurality of paper abutting portions arranged on the side of the conveyance path and arranged side by side along the conveyance path, and a side of the paper on the conveyance path is abutted;
Using a plurality of paper transport means provided with their positions in the paper transport direction being shifted from each other, the paper on the transport path is moved toward the paper abutting portion, and the side of the paper is pushed against the paper An abutting means that abuts against the abutting part;
A sheet conveying member that is provided on the downstream side of the plurality of sheet conveying means and conveys the sheet to the downstream side;
With
A sheet provided with one or more sheet abutting portions on the downstream side of the sheet conveying means located on the most downstream side of the plurality of sheet conveying means and on the upstream side of the sheet conveying member. Conveying device. The length of the side of the smallest size paper that can be transported by the paper transport device is L1, and the paper abutting portion located on the most downstream side of the plurality of paper abutting portions, the paper transporting member, When the separation distance between is L2,
The sheet conveying device according to claim 1, wherein the sheet abutting portion located on the most downstream side is installed at a location where a relationship of L2 <(1/3) * L1 is established.   Two or more paper abutting portions are provided on the downstream side of the second paper transporting unit counting from the paper transporting unit located on the most downstream side of the plurality of paper transporting units toward the upstream side. The paper conveyance device according to claim 1 or 2, wherein the paper conveyance device is installed.   The paper conveying apparatus according to claim 1, wherein the paper abutting portion is configured by a rotatable rotating member.   5. The sheet transport according to claim 1, wherein the sheet abutting portion is formed with an inclined surface that lifts upward a portion of the sheet that has abutted against the sheet abutting portion. apparatus. Image forming means for forming an image on paper;
A conveyance path through which the sheet toward the image forming unit passes;
A plurality of paper abutting portions arranged on the side of the conveyance path and arranged side by side along the conveyance path, and a side of the paper on the conveyance path is abutted;
Using a plurality of paper transport means provided with their positions in the paper transport direction being shifted from each other, the paper on the transport path is moved toward the paper abutting portion, and the side of the paper is pushed against the paper An abutting means that abuts against the abutting part;
A sheet conveying member that is provided on the downstream side of the plurality of sheet conveying means and conveys the sheet to the downstream side;
With
An image in which one or more paper abutting portions are provided on the downstream side of the paper conveying means located on the most downstream side of the plurality of paper conveying means and on the upstream side of the paper conveying member. Forming equipment.

Images