JP6924860B2 - Sheet post-processing device - Google Patents

Description

An embodiment of the present invention relates to a sheet post-processing device that performs post-processing on a sheet on which an image is formed.

Conventionally, a sheet post-processing device that performs post-processing such as stapling processing on a sheet loaded on a processing tray has been known. This sheet post-processing device adjusts the deviation in the width direction of the sheet (horizontally aligning) in order to adjust the deviation between the sheets of the sheets loaded on the processing tray before executing the post-processing, and the width direction of the sheet. It has a member that adjusts the deviation (vertically aligns) in the direction orthogonal to. In particular, with respect to the deviation in the direction orthogonal to the width direction of the sheet, the deviation of the sheet loaded on the processing tray was made uniform by using a vertical alignment member rotating around the rotation axis extending in the width direction of the sheet. ..

Japanese Patent Application Laid-Open No. 2008-214102

However, in order to obtain a more accurate sheet alignment state, it is necessary to rotate the vertical alignment member a plurality of times to perform the sheet alignment process, which hinders the improvement of the processing speed of the sheet aftertreatment device. rice field. Therefore, there is a demand for a technique for obtaining a highly accurate sheet alignment state while improving the processing speed.

In order to achieve the above object, the sheet post-processing device of the present embodiment includes a rotation shaft, a standby unit for accumulating the sheet, a processing unit for executing post-processing on the sheet supplied from the standby unit, and the rotation. A first paddle that is attached to a shaft and rotates around the rotation axis to come into contact with a sheet supplied from the standby unit and pull the sheet toward a stopper, and a predetermined angle with respect to the first paddle. A second paddle that is attached to the rotating shaft and that pulls the sheet toward the stopper after the first paddle is separated from the seat after the pulling operation of the seat of the first paddle, and the above. A control unit that controls the rotation of the first paddle and the second paddle so that the first paddle and the second paddle stop at positions separated from the seat of the processing unit after the seat is pulled in by the first paddle. The amount of pulling in the sheet by the second paddle is smaller than the amount of pulling in the sheet of the first paddle .

The figure which shows the whole structure of the image formation system in this embodiment. The electric block diagram of the image forming apparatus and the sheet post-processing apparatus in this embodiment. The figure which shows the detail of each part composition of the sheet post-processing apparatus in this embodiment schematically. The figure which shows typically the relationship between the standby tray and the paddle part in this embodiment. The figure which shows the paddle part in this embodiment. The figure which shows the standby position of the 1st paddle and the 2nd paddle in this embodiment. The figure which shows the sheet movement processing by the 1st paddle in this embodiment. The figure which shows the vertical alignment processing by the 1st paddle in this embodiment. The figure which shows the stop position of the 1st paddle and the 2nd paddle in this embodiment. The figure which shows the vertical alignment processing by the 2nd paddle in this embodiment. The figure which shows the state after the completion of the vertical alignment processing by the 1st paddle and the 2nd paddle in this embodiment. The figure which shows the standby position of the 1st paddle and the 2nd paddle after the vertical alignment processing in this embodiment.

Hereinafter, the sheet post-processing apparatus of the embodiment will be described with reference to the drawings. In the following description, configurations having the same or similar functions will be described with the same reference numerals. In addition, duplicate explanations of these configurations may be omitted.

The sheet post-processing apparatus of one embodiment will be described with reference to FIGS. 1 to 12. FIG. 1 is a diagram showing an overall configuration of an image forming system. FIG. 2 is a diagram showing an electric block diagram of an image forming apparatus and a sheet post-processing apparatus. The image forming system includes an image forming device 1 and a sheet post-processing device 2. The image forming apparatus 1 forms an image on a sheet-like medium (hereinafter, referred to as "sheet") such as paper. The sheet post-processing device 2 performs post-processing on the sheet conveyed from the image forming device 1.

The image forming apparatus 1 shown in FIG. 1 includes a control panel 11, a scanner unit 12, a printer unit 13, a paper feeding unit 14, a paper ejection unit 15, and an image forming control unit 16.

The control panel 11 includes various keys that accept user operations. For example, the control panel 11 accepts input regarding the type of post-processing of the sheet. The control panel 11 sends the input information regarding the type of post-processing to the sheet post-processing device 2.

The scanner unit 12 includes a reading unit that reads image information of an object to be copied. The scanner unit 12 sends the read image information to the printer unit 13.

The printer unit 13 forms an output image (hereinafter, referred to as “toner image”) with a developer such as toner based on the image information transmitted from the scanner unit 12 or an external device. The printer unit 13 transfers the toner image onto the surface of the sheet. The printer unit 13 applies heat and pressure to the toner image transferred to the sheet to fix the toner image on the sheet.

The paper feeding unit 14 supplies the sheets one by one to the printer unit 13 at the timing when the printer unit 13 forms the toner image. The paper ejection unit 15 conveys the sheet ejected from the printer unit 13 to the post-processing device 2.

As shown in FIG. 2, the image formation control unit 16 controls the overall operation of the image formation device 1. That is, the image formation control unit 16 controls the control panel 11, the scanner unit 12, the printer unit 13, the paper feeding unit 14, and the paper ejection unit 15. The image formation control unit 16 is formed by a control circuit including a CPU, a ROM, and a RAM (not shown).

Next, the sheet post-processing device 2 will be described. The configuration of the sheet post-processing device 2 will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the sheet post-processing device 2 is arranged adjacent to the image forming device 1. The sheet post-processing device 2 executes the designated post-processing on the sheet conveyed from the image forming device 1 through an external device such as a control panel 11 or a client PC. For example, the post-processing is a stapling process or a sorting process.

The sheet post-processing device 2 includes a standby unit 21, a processing unit 22, a discharge unit 23, and a post-processing control unit 24. The standby unit 21 temporarily retains (buffers) the sheet S (see FIG. 3) conveyed from the image forming apparatus 2. For example, the standby unit 21 makes a plurality of subsequent sheets S stand by while the post-processing of the preceding sheet S is performed by the processing unit 22. The standby unit 21 is provided above the processing unit 22. When the sheet of the processing unit 22 is discharged to the discharging unit 23, the standby unit 21 drops the retained sheet S toward the processing unit 22.

The processing unit 22 performs post-processing on the sheet S. For example, the processing unit 22 aligns a plurality of sheets S. The processing unit 22 performs stapling processing on a plurality of matched sheets S. As a result, the plurality of sheets S are bound by the staples. The processing unit 22 discharges the post-treated sheet S to the discharge unit 23.

The discharge unit 23 includes a fixed tray 23a and a movable tray 23b. The fixed tray 23a is provided on the upper part of the sheet post-processing device 2. The movable tray 23b is provided on the side portion of the sheet post-processing device 2. The stapled or sorted sheet S is discharged to the movable tray 23b.

As shown in FIG. 2, the post-processing control unit 24 controls the overall operation of the sheet post-processing device 2. That is, the post-processing control unit 24 controls the standby unit 21, the processing unit 22, and the discharging unit 23. Further, as shown in FIG. 2, the post-processing control unit 24 controls the inlet roller 32a, the outlet roller 33a, the paddle unit 25, and the paddle motor 28, which will be described later. The post-processing control unit 24 is formed by a control circuit including a CPU, a ROM, and a RAM (not shown).

FIG. 3 is a diagram schematically showing the details of the configuration of each part of the sheet aftertreatment device 2. The "sheet transport direction" described in the present embodiment is the transport direction D of the sheet S with respect to the standby tray 211 of the standby unit 21 (direction in which the sheet S enters the standby tray 211) or the sheet S is the processing tray 221. It means the direction of being conveyed to the movable tray 23b.

Further, the "upstream side" and the "downstream side" described in the present embodiment mean the upstream side and the downstream side in the sheet transport direction D, respectively. Further, the "tip portion" and "rear end portion" described in the present embodiment mean the "downstream side end portion" and the "upstream side end portion" in the sheet transport direction D, respectively. Further, in the present embodiment, the direction orthogonal to the sheet transport direction D is referred to as the sheet width direction W.

Hereinafter, description will be given with reference to FIG. The transport path 31 is a transport path from the sheet supply port 31p to the sheet discharge port 31d. The sheet supply port 31p is arranged at a position facing the image forming apparatus 1. The sheet S is supplied from the image forming apparatus 1 to the sheet supply port 31p. On the other hand, the sheet discharge port 31d is located in the vicinity of the standby unit 21. The sheet S discharged from the image forming apparatus 1 is discharged to the standby unit 21 via the transport path 31.

The inlet rollers 32a and 32b are provided in the vicinity of the sheet supply port 31p. The inlet rollers 32a and 32b convey the sheet S supplied to the sheet supply port 31p toward the downstream side of the transfer path 31. For example, the inlet rollers 32a and 32b convey the sheet S supplied to the sheet supply port 31p to the outlet rollers 33a and 33b.

The outlet rollers 33a and 33b are provided in the vicinity of the seat discharge port 31d. The outlet rollers 33a and 33b receive the sheet S conveyed by the inlet rollers 32a and 32b. The outlet rollers 33a and 33b convey the sheet S from the sheet discharge port 31d to the standby unit 21.

The standby unit 21 includes a standby tray (buffer tray) 211, a transport guide 212, discharge rollers 213a and 213b, and an opening / closing drive unit (not shown).

The rear end of the standby tray 211 is located in the vicinity of the outlet rollers 33a and 33b. The rear end of the standby tray 211 is located slightly below the sheet discharge port 31d of the transport path 31. The standby tray 211 is tilted with respect to the horizontal direction so as to gradually increase toward the downstream side of the sheet transport direction D. The standby tray 211 is made to stand by by stacking a plurality of sheets S while the post-processing is performed by the processing unit 22.

FIG. 4 is a diagram schematically showing the relationship between the standby tray 211 and the paddle portion 25 described later. As shown in FIG. 4, the standby tray 211 has a first tray member 211a and a second tray member 211b. The first tray member 211a and the second tray member 211b are separated from each other in the seat width direction W. The first tray member 211a and the second tray member 211b receive power from the opening / closing drive unit and move in a direction of approaching each other and a direction of moving away from each other.

The first tray member 211a and the second tray member 211b support the sheet S conveyed from the outlet rollers 33a and 33b in a state of being close to each other. On the other hand, the first tray member 211a and the second tray member 211b move the sheet S from the standby tray 211 toward the processing tray 221 by being separated from each other in the sheet width direction W. As a result, the sheet S supported by the standby tray 211 falls from the space between the first tray member 211a and the second tray member 211b toward the processing tray 221. That is, the sheet S moves from the standby tray 211 to the processing tray 221.

The assist arm 41 shown in FIG. 3 is provided above the standby tray 211. For example, the assist arm 41 has a length of approximately half or more of the standby tray 211 in the sheet transport direction D1. In the present embodiment, the assist arm 41 has substantially the same length as the standby tray 211 in the sheet transport direction D. The assist arm 41 is a plate-shaped member that extends above the standby tray 211. The seat S discharged from the outlet rollers 33a and 33b enters the space between the assist arm 41 and the standby tray 211.

The processing unit 22 shown in FIG. 3 has a processing tray 221 and a stay plastic 222, transfer rollers 223a and 223b, a transfer belt 224, a stopper 225, and a horizontal alignment plate 51.

The processing tray 221 is provided below the standby tray 211. The processing tray 221 is tilted with respect to the horizontal direction so as to gradually increase toward the downstream side of the sheet transport direction D. The processing tray 221 is tilted substantially parallel to the standby tray 211. The plurality of sheets S moved to the processing tray 221 are aligned with each other by the horizontal alignment plate 51 in the sheet width direction W.

The stay plastic 222 is provided at the end of the processing tray 221. The stay plastic 222 performs a staple (binding) process on a bundle of a predetermined number of sheets S located on the processing tray 221.

The transfer rollers 223a and 223b are arranged at predetermined intervals in the sheet transfer direction D. The transport belt 224 is hung on the transport rollers 223a and 223b. The transport belt 224 is rotated in synchronization with the transport rollers 223a and 223b. The transport belt 224 transports the sheet S between the stay plastic 222 and the discharge unit 23.

The stopper 225 is arranged upstream in the sheet transport direction when viewed from the transport path roller 223b. The stopper 225 is a member for aligning the sheet S moved from the standby tray 211 to the processing tray 221 in the sheet transport direction by abutting the sheet S against the member. In other words, the stopper 225 is a member that serves as a sheet abutting reference when performing matching processing in the sheet transport direction. That is, the sheet S is moved upstream in the sheet transport direction by the first paddle 25a and the second paddle 25b, which will be described later, and is abutted against the stopper 225 to be aligned with the sheet transport direction. Hereinafter, aligning the sheets in the sheet transport direction may be referred to as vertical alignment processing.

The paddle portion 25 shown in FIG. 3 has a first paddle 25a, a second paddle 25b, a rotating shaft 26, and a rotating body 27.

The rotation shaft 26 is the rotation center of the first paddle 25a and the second paddle 25b, which will be described later. The rotating shaft 26 is located below the standby tray 211. The rotation shaft 26 extends in the seat width direction W. The rotating shaft 26 receives a driving force from the paddle motor 28 and rotates in the direction of arrow A (counterclockwise direction) in FIG.

FIG. 5 is a diagram showing a detailed structure of the paddle portion 25. The paddle portion 25 has a first paddle 25a, a second paddle 25b, and a rotating body 27.

The rotating body 27 has a cylindrical shape in which a part of the region is missing. The rotating body 27 has a protrusion 271. The protrusion 271 is detachably attached to the rotating shaft 26 by fitting into a groove provided in advance on the rotating shaft 26. When the rotating shaft 26 rotates in the rotation direction A (counterclockwise) in FIG. 3, the rotating body 27 also rotates integrally in the same direction. Further, since the first paddle 25a and the second paddle 25b are attached to the rotating body 27, when the rotating shaft 26 rotates in the direction of the arrow A in FIG. 3, it rotates counterclockwise together with the rotating body 27.

The first paddle 25a and the second paddle 25b are formed of an elastic material such as rubber or resin. The first paddle 25a projects in the radial direction of the rotating body 27 and is attached to the rotating body 27. The first paddle 25 has a length L1 in the radial direction of the rotating body 27. The first paddle 25a has a shape in which the thickness d1 at the mounting position of the rotating body 27 and the thickness d2 at the tip of the paddle are different. Specifically, the first paddle 25a has a thickness d1 in a region from the attachment position x0 to the rotating body 27 to the position x1 protruding in the radial direction of the rotating body 27. Further, the first paddle 25a has a shape in which the thickness d1 gradually decreases toward the position x2 in the region from the position x1 to the position x2. The first paddle 25a has a thickness d2 (<d1) in the region from position x2 to position x3.

As shown in FIG. 5, the second paddle 25b is arranged at a predetermined angle with respect to the first paddle 25a. In other words, the second paddle 25b is provided at a predetermined distance behind the first paddle 25 in the rotation direction A.

The second paddle 25b projects in the radial direction of the rotating body 27 and is attached to the rotating body 27. The length of the second paddle 25b has a length L2 shorter than the length L1 of the first paddle 25 in the radial direction of the rotating body 27. Further, the second paddle 25b has a shape in which the thickness d1 at the mounting position of the rotating body 27 is thicker than the thickness d2 at the tip of the paddle, similarly to the first paddle 25a. Since the shape of the second paddle 25b is the same as that of the first paddle 25a, the description thereof will be omitted.

Further, the first paddle 25a and the second paddle 25b are preferably in the following relationship in order to make the pull-in amount of the seat S by the first paddle 25a larger than the pull-in amount of the seat S by the second paddle 25b. .. For example, in order to make the stress generated by the bending of the first paddle 25a larger than the stress generated by the bending of the second paddle, the Young's modulus of the first paddle 25a is set to the Young's modulus of the second paddle 25b. It is preferable to use a material larger than the rate. Regarding the hardness of the first paddle 25a and the second paddle 25b, it is preferable that the hardness of the first paddle 25a is higher than the hardness of the second paddle 25b. Regarding the relationship between the thicknesses of the first paddle 25a and the thickness of the second paddle 25b, it is preferable that the thickness of the first paddle 25a is thicker than the thickness of the second paddle 25b. In particular, it is preferable that the thickness of the paddle at the portion in contact with the sheet S is configured so that the first paddle is thicker than the second paddle.

A series of operations of the first paddle 25a and the second paddle 25b will be described with reference to FIGS. 6 to 12.

FIG. 6 is a diagram showing a standby position before the first paddle 25a and the second paddle 25b are rotationally driven. The "standby position" means the first paddle 25a, the second paddle 25a, when the sheet S is retained from the outlet rollers 33a, 33b toward the standby tray 211, or when the sheet S is directly sent from the outlet rollers 33a, 33b to the processing tray 221. This is the position where the paddle 25b stands by. In other words, it is the position when the first paddle 25a and the second paddle 25b are not performing the vertical alignment processing on the sheet.

In FIG. 6, the first paddle 25a is arranged at a position that does not project toward the downstream side in the sheet transport direction D from the outer peripheral surface of the outlet roller 33b when viewed from the shaft 33c of the outlet roller 33b. From another point of view, the first paddle 25a is located on the upstream side in the transport direction from the outer peripheral surface of the outlet roller 33b located near the standby tray 211 when viewed from the standby tray 211, and from the outlet roller 33b to the standby tray 211. It is arranged at a position that does not interfere with the transportation of the sheet S to be transported. The tip of the second paddle 25b is arranged at a position separated from the sheet S on the processing tray 221 by a predetermined distance.

FIG. 7 is a diagram showing a state in which the first paddle 25a is in contact with the sheet S moving from the standby tray 211 to the processing tray 221. When a predetermined number of sheets S are accumulated in the standby tray 211, the post-processing control unit 24 drives the pair of standby tray members 211a and 211b in the direction W apart from each other in the sheet width direction W, and the retained sheets S. To the processing tray 221.

The post-processing control unit 24 rotates the rotating shaft 26 by driving the paddle motor 28. The first paddle 25a comes into contact with the sheet S falling from the standby tray 211 by rotating along with the rotation of the rotating shaft 26, and applies a force to move toward the processing tray 221.

FIG. 8 is a diagram showing an operation in which the first paddle 25a vertically aligns the sheet S moved to the processing tray 221 by further rotating in the direction of arrow A (counterclockwise).

The first paddle 25a is further rotated in the direction of arrow A from the state shown in FIG. 7 to guide the sheet S onto the processing tray 221 and comes into contact with the processing tray 221 with the sheet S sandwiched between them, resulting in a curved state (FIG. 8). reference). The first paddle 25a moves the sheet S toward the stopper 225 located upstream of the processing tray 221 in the sheet transport direction while maintaining the curved state by rotating in the direction of the arrow A. That is, the first paddle 25a performs the vertical alignment process by sandwiching the sheet S together with the processing tray 221 and pulling it toward the stopper 225.

FIG. 9 is a diagram showing the states of the first paddle 25a and the second paddle 25b after the vertical alignment processing of the sheet S by the first paddle 25a shown in FIG.

The post-processing control unit 24 controls the paddle motor 28 when the first paddle 25a reaches a position separated from the sheet S of the processing tray 221 after the vertical alignment processing on the sheet S by the first paddle 25a is performed. The rotation of the rotating shaft 26 is stopped. As a result, the rotation of the first paddle 25a and the second paddle 25b is stopped. The second paddle 25b is stopped so as to be positioned at a position separated from the sheet S of the processing tray 221 by a predetermined distance. That is, the first paddle 25a and the second paddle 25b are positioned at positions separated from the sheet S of the processing tray 221 by a predetermined distance after the vertical alignment processing of the first paddle 25a on the sheet S is performed. The rotation operation is controlled to stop.

Here, the reason why the first paddle 25a and the second paddle 25b are stopped at positions separated from the sheet S on the processing tray 221 by a predetermined distance is as follows. After the vertical alignment process is performed on the sheet S by the first paddle 25a, the horizontal alignment plate 51 executes a process (horizontal alignment process) for aligning the edges in the width direction of the sheet in the sheet width direction W. If the first paddle 25a or the second paddle 25b is in contact with the sheet S during this horizontal alignment process, it interferes with the process of aligning the widthwise ends of the sheet S (horizontal alignment process), so that the first paddle The 25a and the second paddle 25b are separated from the seat S.

FIG. 10 is a diagram showing an operation in which the second paddle 25b vertically aligns the sheet S on the processing tray 221. The post-processing control unit 24 controls the drive of the paddle motor 28 to rotate the first paddle 25a and the second paddle 25b again in the direction of arrow A. The first paddle 25a and the second paddle 25b are driven by the paddle motor 28 and rotate counterclockwise.

Hereinafter, the description will be focused on the second paddle 25b. The second paddle 25b is in contact with the sheet S and is sandwiched with the processing tray 221 in a curved state, and pulls in toward the stopper 225.

Here, the reason why the vertical alignment processing is further performed by the second paddle 25b is as follows. When the seat S is pulled toward the stopper 225 by the first paddle 25a, the pulling amount of the seat S may become excessive. In this case, the sheet S abuts on the stopper 225, and the repulsive force of the sheet S causes the sheet to move in the sheet transport direction D, and there is a possibility that the sheet alignment in the sheet transport direction cannot be performed accurately. Therefore, by pulling in the seat S with the first paddle 25a and then pulling in again with the second paddle 25b, the seat S for which the vertical alignment process could not be sufficiently performed with the first paddle 25a is again performed. It is possible to execute the vertical alignment process and improve the consistency in the sheet transport direction. Further, since the vertical alignment process can be executed twice by the first paddle portion 25a and the second paddle portion 25b while the first paddle portion 25a makes one rotation, it is necessary to rotate the paddle portion a plurality of times. It contributes to speeding up sheet processing.

Further, since the vertical alignment process is already executed on the sheet S by the first paddle 25a, the amount of the second paddle 25b pulling in the sheet S is smaller than the amount of the first paddle 25a pulling in the sheet S. It is preferable to set as such. Therefore, in the present embodiment, when the length L2 of the second paddle 25b is made shorter than the length L1 of the first paddle 25a as described above, the seat S is retracted by the second paddle 25b. The area of contact between the sheet S and the second paddle 25b is made smaller than the area of contact between the sheet S and the first paddle 25a. Therefore, the pull-in amount of the seat S by the second paddle 25b can be made smaller than the pull-in amount of the first paddle 25a.

FIG. 11 is a diagram showing a state after completion of the vertical alignment process by the first paddle 25a and the second paddle 25b.

After executing the vertical alignment process by the second paddle 25b, the first paddle 25a and the second paddle 25b rotate to the positions shown by the solid lines in FIG. 11 and then stop. Here, the broken line shown in the figure is a position indicating the standby position of the first paddle 25a and the second paddle 25b shown in FIG. After the vertical alignment process of the second paddle 25b, the post-processing control unit 24 rotates the first paddle 25a and the second paddle 25b to a position (the position indicated by the solid line) beyond the standby position, so that the post-processing control unit 24 performs the vertical alignment process. Make sure that the second paddle 25b is separated from the sheet S on the processing tray 221. As a result, it is possible to prevent the second paddle 25b from stopping in contact with the sheet S on the processing tray 221 and adversely affecting the integrity of the sheets when the subsequent sheets are conveyed to the processing tray.

After that, the post-processing control unit 24 controls the paddle motor 29 to rotate in the direction opposite to the arrow A direction (clockwise), and positions the first paddle 25a and the second paddle 25b in the standby position.

FIG. 12 is a diagram showing a state in which the first paddle 25a and the second paddle 25b have returned to the standby position. The first paddle 25a and the second paddle 25b wait for the subsequent sheet to be received in the waiting tray 211 while being positioned in the waiting position.

As described above, according to the present embodiment, the following effects are obtained. The first paddle 25a and the second paddle 25b pull the sheet on the processing tray toward the stopper to perform vertical alignment processing, so that the processing speed is increased and the consistency of the sheet in the sheet transport direction is improved. It becomes possible.

Further, the pulling operation of the seat S toward the stopper 225 by the first paddle 25a and the second paddle 25b is executed while the first paddle 25a makes one rotation around the rotation shaft 26. Therefore, it is not necessary to rotate the first paddle 25a a plurality of times in order to improve the sheet consistency, which contributes to increasing the sheet processing speed.

Since the second paddle 25b performs the sheet pulling operation again after the sheet pulling operation on the processing tray is completed by the first paddle 25a and after the first paddle is separated from the sheet, the first paddle 25a Even if the vertical alignment process is insufficient, it is possible to accurately align the sheets in the sheet transport direction.

Further, the post-processing control unit 24 sets the first paddle so that the first paddle 25a and the second paddle 25b stop at positions separated from the sheet S of the processing tray 221 after the seat S is pulled in by the first paddle 25a. Since the rotation of the 25a and the second paddle 25b is controlled, it is possible to prevent the horizontal alignment plate 51 from interfering with the subsequent processing for aligning the seat edges in the sheet width direction W (horizontal alignment processing).

Further, the first paddle 25a is located at a position that does not interfere with the sheet transfer in the standby position after the vertical alignment process by the second paddle 25b, and the second paddle 25b is located at a position that does not contact the sheet S on the processing tray 221. Since it is located, it does not interfere with the sheet transfer of the subsequent sheet to the standby tray 211, and has the effect of not disturbing the alignment of the sheet S.

Further, since the first paddle 25a and the second paddle 25b are configured so that the pull-in amount of the sheet by the second paddle 25b is smaller than the pull-in amount of the sheet of the first paddle 25a, the accuracy of the sheet consistency is correct. Can be improved. In particular, since the second paddle 25b is composed of a member having a length shorter than that of the first paddle 25a, the pull-in amount of the seat S by the second paddle 25b should be smaller than the pull-in amount of the first paddle 25a. This makes it possible to improve the accuracy of sheet integrity.

Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... image forming device, 2 ... sheet post-processing device, 21 ... standby unit, 22 ... processing unit, 23 ... discharging unit, 24 ... post-processing control unit, 25a ... first paddle, 25b ... second paddle, 211 ... standby Tray, 221 ... Processing tray

Claims (2)

Rotation axis and
A standby unit that holds the seat and
A processing unit that executes post-processing on the sheet supplied from the standby unit,
A first paddle that is attached to the rotating shaft and rotates around the rotating shaft to come into contact with a sheet supplied from the standby unit and pull the sheet toward a stopper.
The seat is attached to the rotating shaft at a predetermined angle with respect to the first paddle, and after the seat of the first paddle is retracted and the first paddle is separated from the seat, the seat is pulled. The second paddle that pulls in toward the stopper,
Control to control the rotation of the first paddle and the second paddle so that the first paddle and the second paddle stop at positions separated from the seat of the processing unit after the seat pulling operation by the first paddle. With a department ,
A sheet post-processing device in which the amount of sheet drawn in by the second paddle is smaller than the amount of sheet drawn in of the first paddle. The pulling operation of the seat toward the stopper by the first paddle and the second paddle is executed while the first paddle makes one rotation about the rotation axis.
The sheet post-processing apparatus according to claim 1.

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