JP5939062B2 - Post-processing apparatus and image forming system - Google Patents

Description

  The present invention relates to a post-processing apparatus and an image forming system.

  For example, Patent Document 1 discloses that a jogger fence that can align well even when the number of sheet bundles increases and always aligns discharged sheet bundles in order to ensure proper return roller operation timing. In addition, a sheet post-processing device is disclosed that includes a trailing edge fence serving as a reference in the vertical direction, a return roller that performs vertical alignment, and a stapling device that binds the aligned sheet bundle. The sheet post-processing apparatus includes an alignment control unit that controls so that the alignment operation in the horizontal direction by the jogger fence is started after a predetermined time has elapsed after the alignment in the vertical direction by the return roller is completed.

  Further, in Patent Document 2, in order to provide a sheet aligning device that is excellent in durability and can improve alignment accuracy, a sheet to be stapled is discharged to a staple tray, and its trailing end falls after its own weight. It is disclosed that vertical alignment is performed by hitting the end fence. In order to improve the reliability of this vertical alignment, a return roller is provided, and the sheet is forcibly dropped by hitting the upper surface of the sheet. The return roller is drivingly connected to a return motor for swinging the return roller in the sheet contacting / separating direction via a torsion coil spring. Then, the higher the sheet stacking height, the smaller the rotation amount of the motor, and the pressing force of the return roller is always kept constant. Further, it is disclosed that the processing efficiency is maintained by increasing the rotational speed of the motor as the loading height is lower.

Japanese Patent Application Laid-Open No. 07-172658 Japanese Patent No. 3621565

  The present invention suppresses disturbance of the conveyance of the recording material from the conveyance unit to the aligning unit when there are a plurality of conveyance units that convey the recording material in intermittent contact.

According to the first aspect of the present invention, the recording material is conveyed while intermittently contacting with the recording material by being rotatably provided, and is separated from the conveying position for conveying the recording material and the conveying path of the recording material. A recording medium conveyed between the first conveyance unit and a first conveyance unit that moves between the first conveyance unit and a recording material that is rotatably provided to convey the recording material while intermittently contacting the recording material. At a speed faster than the sum of the speed at which the first transport unit transports the recording material at the transport position and the speed at which the first transport unit moves from the separation position toward the transport position in the recording material transport direction. A second conveying unit that conveys the recording material; and an aligning unit that forms a recording material bundle while aligning the end of the recording material by abutting the end of the recording material conveyed from the second conveying unit. Is a post-processing apparatus.
The invention according to claim 2 is characterized in that the second transport unit is arranged at a position where the recording material transported by the first transport unit can be transported together with the first transport unit. a post-processing apparatus according to claim 1 Symbol mounting to.
Third aspect of the present invention, the first conveyor, after claim 1 or 2, wherein the moving between the said transport position while maintaining a state where the rotation the separation position It is a processing device.

According to a fourth aspect of the present invention, there is provided an image forming portion for forming an image on a recording material, and a recording material on which an image is formed by the image forming portion while being rotated and intermittently contacting the recording material. A first conveyance unit that moves between a conveyance position for conveying the recording material and a separation position that is separated from the conveyance path of the recording material, and is provided rotatably and intermittently with the recording material. The recording material is conveyed while being in contact with the recording material conveyed from the first conveyance unit, and the speed at which the first conveyance unit conveys the recording material at the conveyance position and the first conveyance unit at the separation position. A second conveying unit that conveys at a speed faster than the sum in the recording material conveying direction when moving from the second conveying unit to the conveying position, and an end of the recording material conveyed from the second conveying unit Align the edges of the recording material An image forming system characterized by having a alignment portion to form a recording material bundle.

According to the first aspect of the present invention, in the case where there are a plurality of conveying portions that convey the recording material while intermittently contacting, compared to the case where the present configuration is not provided, the recording material from the conveying portion to the aligning portion It can suppress that conveyance is disturbed. Further, according to the first aspect of the invention, as compared with the case not having the present structure, when the first conveyor is and away with respect to the recording material conveyance path, a second conveying unit first conveyor It is possible to maintain a state in which the recording material is conveyed at a higher speed than that.
According to the second aspect of the invention, as compared with the case not having the present structure, in a more prone state deflection to the recording material between the first conveyor and the second conveyor unit, aligned from the conveying unit It is possible to suppress the conveyance of the recording material to the part from being disturbed.
According to the third aspect of the present invention, the mechanism for rotating the first transport unit can be simplified as compared with the case where this configuration is not provided.
According to the fourth aspect of the present invention, when there are a plurality of conveyance units that convey the recording material while intermittently contacting, compared to the case where this configuration is not provided, the recording material from the conveyance unit to the alignment unit It can suppress that conveyance is disturbed.

1 is a diagram showing an overall configuration of an image forming system to which an embodiment of the present invention is applied. 1 is a diagram illustrating an image forming apparatus. It is a figure explaining the post-processing apparatus to which this Embodiment is applied. It is the figure which detailed the structure of the post-processing part. It is a block diagram of a control part. It is the figure which showed the state of the recording material in a comparative example. FIG. 6 is a diagram illustrating a state when a sub-paddle contact portion approaches a recording material on a recording material loading table.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
<Image forming system 1>
FIG. 1 is a diagram showing an overall configuration of an image forming system 1 to which an embodiment of the present invention is applied. An image forming system 1 shown in FIG. 1 includes, for example, an image forming apparatus 2 such as a printer or a copying machine that forms an image on a recording material by an electrophotographic method, and a recording material (for example, an image recorded by the image forming apparatus 2). And a post-processing device 3 that performs post-processing on the paper.

<Image forming apparatus 2>
FIG. 2 is a diagram illustrating the image forming apparatus 2.
The image forming apparatus 2 is a so-called “tandem type” color printer, and controls the operation of the entire image forming apparatus 2 that performs image formation based on image data and communication with, for example, a personal computer (PC). A main control unit 50 that executes image processing performed on the image data, and a user interface (UI) unit 90 that receives an operation input from the user and displays various types of information to the user.

<Image forming unit 10>
The image forming unit 10 is a functional unit that forms an image by, for example, electrophotography, and includes six image forming units 11C, 11M, 11HC, 11HM, 11Y, and 11K (hereinafter, “image forming unit 11”), The intermediate transfer belt 20 to which each color toner image formed on the photosensitive drum 12 of the image forming unit 11 is transferred, and each color toner image formed by each image forming unit 11 is transferred to the intermediate transfer belt 20 (primary transfer). The primary transfer roll 21 is provided.
Further, the image forming unit 10 includes a secondary transfer roll 22 that collectively transfers (secondary transfer) each color toner image transferred onto the intermediate transfer belt 20 onto a recording material, and each color toner image that is secondarily transferred. And a fixing unit 60 for fixing the toner image on the recording material.

  In addition, the image forming unit 10 cools each color toner image fixed on the recording material by the fixing unit 60, and promotes fixing of each color toner image on the recording material, and bending of the recording material. And a curl correction unit 85 for correcting (curl). An area where the secondary transfer roll 22 is disposed and each color toner image on the intermediate transfer belt 20 is secondarily transferred to the recording material is hereinafter referred to as a “secondary transfer area Tr”.

<Image forming unit 11>
The image forming units 11 are configured in substantially the same manner except for the toners contained therein, and each of them includes C (cyan) color, M (magenta) color, HC (high chroma cyan) color, and HM (high chroma magenta) color. Y (yellow) and K (black) toner images are formed. The HC color is a cyan color having a cyan hue and a hue that is brighter and higher in saturation than the C color, and the HM color has a magenta hue and a hue that is higher than that of the M color. Is magenta with bright and relatively high saturation.

<Recording material conveyance system>
In addition, the image forming unit 10 serves as a recording material transport system to feed and transport a plurality of recording material storage containers 40A and 40B that store the recording material and recording materials stored in the recording material storage containers 40A and 40B, respectively. Rolls 41A and 41B, and a first transport path R1 and a second transport path R2 for transporting recording materials from the recording material storage containers 40A and 40B, respectively. In addition, the image forming unit 10 includes a third transport path R3 that transports the recording material from the recording material storage containers 40A and 40B toward the secondary transfer region Tr. Further, the image forming unit 10 conveys the recording material onto which each color toner image is transferred in the secondary transfer region Tr so as to pass through the fixing unit 60, the cooling unit 80, and the curl correction unit 85. And a fifth transport path R5 for transporting the recording material from the curl correction unit 85 toward the post-processing device 3.
From the first conveyance path R1 to the fifth conveyance path R5, conveyance rolls and conveyance belts are arranged along the respective conveyance paths, and sequentially convey the recording materials that are sent.

<Image forming operation>
Next, an image forming operation in the image forming apparatus 2 will be described with reference to FIG.
Each of the image forming units 11 of the image forming unit 10 forms toner images of C, M, HC, HM, Y, and K colors by an electrophotographic process. Each color toner image formed by each image forming unit 11 is primary-transferred sequentially on the intermediate transfer belt 20 by the primary transfer roll 21 to form a composite toner image in which the respective color toners are superimposed. The synthetic toner image on the intermediate transfer belt 20 is conveyed to the secondary transfer region Tr in which the secondary transfer roll 22 is disposed as the intermediate transfer belt 20 moves (in the direction of the arrow).

On the other hand, in the recording material transport system, the feeding rolls 41A and 41B rotate in accordance with the start timing of image formation in each image forming unit 11, and are designated by the UI unit 90 from among the recording material storage containers 40A and 40B. The other recording material is fed out by feeding rolls 41A and 41B. The fed recording material is transported along the first transport path R1 or the second transport path R2 and the third transport path R3, and reaches the secondary transfer region Tr.
In the secondary transfer region Tr, the composite toner image held on the intermediate transfer belt 20 is secondarily transferred collectively to the recording material by the transfer electric field formed by the secondary transfer roll 22.

Thereafter, the recording material onto which the composite toner image has been transferred is separated from the intermediate transfer belt 20 and conveyed to the fixing unit 60 along the fourth conveyance path R4. The synthetic toner image on the recording material is fixed on the recording material by a fixing process by the fixing unit 60. The recording material on which the fixed image is formed is cooled by the cooling unit 80 and the curl correcting unit 85 corrects the bending of the recording material. Thereafter, the recording material that has passed through the curl correction unit 85 is guided to the fifth transport path R5 and transported toward the post-processing device 3.
In this manner, the image forming process in the image forming apparatus 2 is repeatedly executed for the number of printed sheets.

<Post-processing device 3>
FIG. 3 is a diagram illustrating the post-processing device 3 to which the present exemplary embodiment is applied.
The post-processing device 3 shown in FIG. 3 includes a conveyance unit 110 that conveys the recording material output from the image forming apparatus 2 further downstream, and a compile stacking unit that collects and bundles, for example, binding staples and recording materials. And a post-processing unit 120 including 124 and the like. Further, the post-processing device 3 includes a stacking unit 190 that stacks recording materials so that the user can easily take them. The post-processing device 3 includes a control unit 200 that controls the entire post-processing device 3, and the control unit 200 is provided in the post-processing unit 120, for example.

  As shown in FIG. 3, the conveyance unit 110 of the post-processing device 3 includes an entrance roll 111 that is a pair of rolls that receives a printed recording material output from the image forming apparatus 2 (see FIG. 1). It has the 1st conveyance roll 112 which is a pair of roll which conveys a recording material downstream, and the 2nd conveyance roll 113 which is a pair of roll which conveys a recording material toward the post-processing part 120.

  The post-processing unit 120 of the post-processing device 3 has the following functional members inside the housing structure 120A. That is, the post-processing unit 120 includes a receiving roll 121 that is a pair of rolls that receives the recording material from the transport unit 110, and an exit sensor 122 that is provided on the downstream side of the receiving roll 121 and detects the recording material. ing. The post-processing unit 120 also collects and stacks a plurality of recording materials that are sequentially conveyed, and an exit roll 123 that is a pair of rolls that discharge the recording material toward the compilation stacking unit 124. It has.

  Further, the post-processing unit 120 includes a main paddle 125 and a sub paddle 126 configured to include blade members that rotate to push the end of the recording material toward an end guide (described later) of the compilation stacking unit 124, and the recording A stapler 127 for binding the ends of the bundle of materials. Further, the post-processing unit 120 includes an eject roll 128 that conveys a bundle of recording materials accumulated in the compilation stacking unit 124 to the stacking unit 190. Furthermore, the post-processing unit 120 performs alignment with respect to both ends of the recording material in a direction orthogonal to (intersecting with) the recording material conveyance direction of the compilation stacking unit 124 (front side and back side of the paper surface in FIG. 3). Tamper (not shown).

FIG. 4 is a diagram detailing the configuration of the post-processing unit 120.
First, the compiling stacking unit 124, which is an example of an aligning unit, is formed in a direction intersecting with a recording material stacking table 124a that receives and stacks a recording material from the exit roll 123 and a recording material stacking surface of the recording material stacking table 124a. And an end guide 124b. The end guide 124b is a reference surface that serves as a reference for the end surface of the recording material when aligning the recording materials discharged from the exit roll 123. The end guide 124b abuts the end surface of the recording material against the end guide 124b, thereby collecting a bundle of recording materials. Generate.

  As shown in FIG. 4, the main paddle 125 includes a main paddle rotating shaft 125a that is rotatably supported at a position closer to the end guide 124b of the compile stacking unit 124 than the sub paddle 126, and the main paddle rotating shaft 125a. A main paddle contact portion 125b provided with three flexible blade members (plate members) provided around and extending away from the main paddle rotation shaft 125a toward the tip.

Here, the main paddle rotating shaft 125a is rotationally driven by a motor (not shown). Further, the main paddle contact portion 125b, which is an example of the second transport unit, rotates with the main paddle rotation shaft 125a while the upper surface of the recording material disposed on the recording material stacking table 124a (or the uppermost surface of the bundle of recording materials). ) And intermittent contact. At this time, the blade member of the main paddle contact portion 125b is elastically deformed by contact with the recording material and rotates while being bent.
Then, as the main paddle rotating shaft 125a driven by a motor (not shown) rotates, the main paddle contact portion 125b rotates in the direction D1 in FIG. 4, and the recording material on the recording material loading platform 124a is moved. It is conveyed to the end guide 124b side (Z2 direction).

  As shown in FIG. 4, the sub-paddle 126 includes a sub-paddle rotation shaft 126a and three flexible blade members provided around the sub-paddle rotation shaft 126a and extending away from the sub-paddle rotation shaft 126a toward the tip. And a sub-paddle contact portion 126b provided.

  The sub paddle 126 rotatably supports the sub paddle rotating shaft 126a, and a sub paddle supporting member 126c that swings the sub paddle rotating shaft 126a. When the sub paddle supporting member 126c swings, the sub paddle supporting member 126c swings. It has a sub-paddle support shaft 126d that is the center of rotation, and a sub-paddle drive motor 126e that supplies a driving force that rotates the sub-paddle rotation shaft 126a and swings the sub-paddle support shaft 126d. Further, the sub paddle 126 has a moving mechanism (not shown) including a cam or the like for swinging the sub paddle support member 126c around the sub paddle support shaft 126d under the driving of the sub paddle drive motor 126e.

Here, the sub paddle rotating shaft 126a is rotationally driven by the sub paddle driving motor 126e.
The sub paddle contact portion 126b, which is an example of the first transport unit, rotates intermittently with the upper surface of the recording material (or the uppermost surface of the recording material bundle) disposed on the recording material stacking base 124a while rotating together with the sub paddle rotating shaft 126a. To touch. At this time, the blade member of the sub-paddle contact portion 126b is elastically deformed by contacting the recording material, and rotates while being bent.
More specifically, as the sub-paddle rotation shaft 126a driven by the sub-paddle drive motor 126e rotates, the sub-paddle contact portion 126b rotates in the direction D2 in FIG. 4, thereby conveying in the Z1 direction in FIG. The thus-recorded recording material is pushed (conveyed) onto the end guide 124b side (Z2 direction) on the recording material stacking table 124a.

  The sub paddle support member 126c rotatably supports the sub paddle rotation shaft 126a on one end side. Further, the sub-paddle support member 126c is fitted to the sub-paddle support shaft 126d with a clearance fit on the end portion side opposite to the end portion supporting the sub-paddle rotation shaft 126a. The sub-paddle support member 126c can swing about the sub-paddle support shaft 126d (C direction in FIG. 4) when driven by a moving mechanism (not shown).

The sub paddle support shaft 126d is rotationally driven by a sub paddle drive motor 126e.
For example, a sub paddle belt (not shown) is attached to the sub paddle support shaft 126d and the sub paddle rotation shaft 126a, and the drive by the sub paddle drive motor 126e is transmitted to the sub paddle rotation shaft 126a via the sub paddle support shaft 126d. .

  Now, the sub-paddle support member 126c rotates about the sub-paddle support shaft 126d, so that the sub-paddle contact portion 126b swings. The sub-paddle contact portion 126b is in contact with the recording material on the recording material stacking base 124a of the compiling stacking portion 124 and comes into contact with the recording material (transport position, broken line in FIG. 4). (Position) and a non-contact position (separated position, position indicated by a solid line in FIG. 4) that does not come into contact with the recording material on the recording material stacking table 124a set at a predetermined distance from the contacting position ( (C direction in FIG. 4). The recording material loading platform 124a of the compilation stacking unit 124 can be regarded as a part of the recording material conveyance path.

Next, the stapler 127 will be described.
The stapler 127 includes a staple head 127a that performs a binding process on a bundle of recording materials using a staple needle (a so-called staple needle), a base 127b that supports the staple head 127a, and a base 127b that supports the staple head 127a. And a rail 127c that forms a moving path. The rail 127c is formed along the end of the recording material stacking base 124a, and the staple head 127a moves on the rail 127c and performs a binding process. Further, a staple move motor (not shown) for moving the staple head 127a, a staple move home sensor (not shown) for detecting the home position of the staple head 127a, and a staple center position for detecting the center position of the staple head 127a. And a sensor (not shown).

When one-point binding is performed on a bundle of recording materials on the compilation stacking unit 124, the staple head 127a is positioned at a first home position position detected by a staple move home sensor (not shown). The binding process is sequentially executed at a necessary timing.
On the other hand, when performing two-point binding on a bundle of recording materials, the apparatus first waits at a second home position position detected by a staple center position sensor (not shown). Thereafter, after a set of recording materials is stacked on the compilation stacking unit 124, a staple move motor (not shown) is driven to move the staple head 127a to the staple position, and binding processing is performed at two locations.

Next, the eject roll 128 will be described.
As shown in FIG. 4, the eject roll 128 has a drive side eject roll 128a and a driven side eject roll 128b. The drive side eject roll 128a and the driven side eject roll 128b are provided so as to be separated from each other.
The drive-side eject roll 128a is rotatably supported by a rotating shaft (not shown) that is driven to rotate by an eject motor (not shown).

  The driven eject roll 128b is rotatably supported. The driven eject roll 128b is supported by a driven eject roll support member (not shown). The driven-side eject roll 128b comes into contact with the recording material loaded on the recording material stacking table 124a of the compiling stacking portion 124 as the driven-side eject roll support member (not shown) swings. 4) and a retreat position (a solid line position in FIG. 4) for retreating a predetermined distance from the recording material loaded on the recording material loading table 124 a of the compilation stacking unit 124. To do.

  Then, the driven-side eject roll 128b is arranged at the contact position (the position indicated by the broken line in FIG. 4), so that the recording material loaded on the recording material stacking base 124a is driven to the drive-side eject roll 128a and the driven-side eject roll 128b. And get caught. Then, the eject motor (not shown) is driven and the drive-side eject roll 128a rotates while the recording material is sandwiched, so that the driven-side eject roll 128b is loaded on the compilation stacking section 124 while being driven to rotate. The recorded material is discharged to the stacking unit 190 (see Z3 in FIG. 4).

<Control unit 200>
Next, the control unit 200 will be described with reference to FIG. Here, FIG. 5 is a block diagram of the control unit 200.
As shown in FIG. 5, the control unit 200 includes a CPU (Central Processing Unit) 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, an input interface 204, and an output interface 205. doing. In the ROM 202, for example, a binding processing program, a recording material conveyance program, a discharge program, and the like are stored in advance. The control unit 200 takes in a signal from the main control unit 50 (see FIG. 2) provided in the image forming apparatus 2 to the CPU 201 via the input interface 204. Then, the CPU 201 executes a predetermined processing program, sends a control signal to the control target via the output interface 205, and controls the operation of the sub-paddle drive motor 126e, for example.

Next, the control of the sub paddle 126 performed by the control unit 200 will be described with reference to FIGS. 4 and 5.
The control unit 200 drives the sub paddle drive motor 126e. As shown in FIG. 4, according to the driving of the sub paddle driving motor 126e, the driving force is transmitted through the sub paddle support shaft 126d, the sub paddle belt (not shown), and the sub paddle rotating shaft 126a, and the sub paddle contact portion 126b is Rotate. Further, the sub-paddle support member 126c swings through a moving mechanism (not shown) in accordance with the driving of the sub-paddle drive motor 126e, so that the sub-paddle contact portion 126b is loaded on the compilation loading portion 124 (see FIG. 4). The recorded material is advanced and retracted.

<Post-processing operation>
Next, a post-processing operation in the post-processing device 3 according to the present embodiment will be described with reference to FIGS. 3 to 5.
First, in a state before the toner image is formed on the recording material by the image forming apparatus 2, the respective functional members of the post-processing apparatus 3 are arranged as follows. That is, the sub-paddle contact portion 126b is disposed at the non-contact position (the position indicated by the solid line in FIG. 4), and the driven eject roll 128b is disposed at the retracted position (the position indicated by the solid line in FIG. 4).

  In the present embodiment, while the post-processing device 3 is performing the post-processing operation, the control unit 200 rotates the sub-paddle contact portion 126b via the sub-paddle drive motor 126e (direction D2 in FIG. 4). Maintain state. In other words, the sub-paddle contact portion 126b is separated from the recording material on the recording material stacking table 124a when conveying the recording material on the recording material stacking table 124a, when approaching the recording material on the recording material stacking table 124a. In any state, the motor rotates at a predetermined speed (direction D2 in FIG. 4).

  In the post-processing apparatus 3, the entrance roll 111 receives the recording material conveyed from the image forming apparatus 2. Then, the recording material that has passed through the first conveyance roll 112 and the second conveyance roll 113 is conveyed by the exit roll 123 in the Z1 direction of FIG. At this time, the recording material passes between the compiling stacking portion 124 and the sub-paddle contact portion 126b, and further passes between the compiling stacking portion 124 and the driven eject roll 128b.

  After the leading end of the recording material in the Z1 direction in FIG. 4 passes between the compiling stacking portion 124 and the sub-paddle contact portion 126b, the sub-paddle contact portion 126b descends while rotating in the D2 direction (see FIG. 4). (Position of the broken line). As a result, the sub-paddle contact portion 126b comes into contact with the recording material. The recording material is pushed in the Z2 direction of FIG. 4 by the rotation of the sub-paddle contact portion 126b shown in FIG. 4 in the D2 direction.

  The recording material conveyed by the sub-paddle contact portion 126b is further pushed in the Z2 direction of FIG. 4 when the main paddle contact portion 125b further rotates in the D1 direction of FIG. Then, the end portion on the end guide 124b side of the recording material pushed in the Z2 direction in FIG. 4 comes into contact with the end guide 124b. Thereafter, the sub-paddle contact portion 126b rises, leaves the recording material, and is disposed again at the non-contact position (the position indicated by the solid line in FIG. 4). The recording material that contacts the end guide 124b is aligned at both ends by a tamper (not shown).

When the subsequent recording materials on which toner images are formed by the image forming apparatus 2 are sequentially supplied to the post-processing apparatus 3, the main paddle 125, the sub paddle 126, and the tamper (not shown) are also provided in the same manner as described above. The edges of the recording material are aligned.
In this way, a bundle of recording materials is formed on the compilation stacking unit 124.

  Next, the driven-side eject roll 128b of the eject roll 128 is lowered and arranged at the contact position (the position indicated by the broken line in FIG. 4), and the bundle of recording materials on the compile stacking unit 124 is driven by the drive-side eject roll 128a. It is sandwiched and fixed by the side eject roll 128b. Then, the staple head 127 a performs a binding process on the bundle of recording materials stacked on the compilation stacking unit 35. Then, the bundle of recording materials subjected to the binding process rises along the recording material stacking base 124a (the Z3 direction in FIG. 4) as the drive-side eject roll 128a and the driven-side eject roll 128b rotate. Then, it is discharged to the loading unit 190.

<Speed difference between main paddle 125 and sub paddle 126>
Next, the relationship between the speed at which the main paddle contact portion 125b transports the recording material and the speed at which the sub paddle contact portion 126b transports the recording material will be described with reference to FIG.
First, the main paddle contact portion 125b in the present embodiment conveys the recording material at a higher speed than the sub paddle contact portion 126b. In addition, in the illustrated example, the main paddle contact portion 125b and the sub paddle contact portion 126b are formed with similar dimensions, and the main paddle contact portion 125b rotates at a faster angular velocity than the sub paddle contact portion 126b.

  Next, the state of the recording material in the comparative example in which the main paddle contact portion 125b and the sub paddle contact portion 126b convey the recording material at the same speed, unlike the present embodiment, will be described with reference to FIG. . Here, FIG. 6 is a diagram showing a state of the recording material in the comparative example. In addition, the sub paddle contact part 126b shown in FIG. 6 is a state arrange | positioned rather than the contact position (position of the broken line of FIG. 4) in the non-contact position (position of the continuous line of FIG. 4).

  As shown in FIG. 6, when the main paddle contact portion 125b and the sub paddle contact portion 126b formed with similar dimensions rotate at equal angular velocities, the conveyed recording material S1 may be curved. More specifically, when both the main paddle contact portion 125b and the sub paddle contact portion 126b convey the recording material S1, the recording material S1 is loaded on the recording material S1 between the main paddle contact portion 125b and the sub paddle contact portion 126b. A convex loop is formed in a direction away from the table 124a.

Here, as shown in FIG. 6, when a loop is formed in the recording material S1 between the main paddle contact portion 125b and the sub paddle contact portion 126b, for example, the main paddle contact portion 125b hits the recording material S1. Can be strong. To explain further, for example, by forming a loop in the recording material S1, the contact area between the main paddle contact portion 125b and the recording material S1 increases. Then, the conveyance force for conveying the recording material S1 by the main paddle contact portion 125b temporarily increases.
As a result, the recording material S1 is drawn between the main paddle contact portion 125b and the end guide 124b, and a jam (paper jam, poor conveyance) may occur between the main paddle contact portion 125b and the end guide 124b. Alternatively, when the recording material S1 protrudes out of the end guide 124b, the recording material S1 may be bent or misaligned.

The reason why the recording material S1 forms a loop between the main paddle contact portion 125b and the sub paddle contact portion 126b rotating at the same angular velocity as in the comparative example shown in FIG. 6 is as follows, for example. Is mentioned.
That is, as shown in FIG. 6, as the sub-paddle contact portion 126b swings (direction C in FIG. 4), the sub-paddle contact portion 126b is in a non-contact position (shown by a broken line in FIG. 4). 4 can be in contact with the recording material S1. In other words, when the sub-paddle contact portion 126b moves between the non-contact position (the position indicated by the solid line in FIG. 4) and the contact position (the position indicated by the broken line in FIG. 4), the sub-paddle contact portion 126b and the recording material S1 are moved. Can touch.

  In this case, the distance L3 from the sub paddle rotation shaft 126a of the sub paddle 126 to the recording material S1 is longer than the distance L1 from the main paddle rotation shaft 125a of the main paddle 125 to the recording material S1. Therefore, even if the main paddle contact portion 125b and the sub paddle contact portion 126b are formed with the same dimensions, and the main paddle contact portion 125b and the sub paddle contact portion 126b rotate at the same angular velocity, the main paddle 125 The distance L3 of the sub paddle 126 is longer than the distance L1.

Accordingly, the peripheral speed of the portion where the sub paddle contact portion 126b contacts the recording material is faster than the portion where the main paddle contact portion 125b contacts the recording material. Due to the difference in peripheral speed between the main paddle contact portion 125b and the sub paddle contact portion 126b, a loop may occur in the recording material S1.
Here, it has been described that a loop is generated in the recording material S1 due to the distances L1 and L3. For example, the load applied to the sub-paddle contact portion 126b due to the contact and separation of the sub-paddle contact portion 126b with the recording material can also contribute to causing a loop in the recording material S1.

In the present embodiment, as described above, the main paddle contact portion 125b conveys the recording material at a higher speed than the sub paddle contact portion 126b. By providing a speed difference between the main paddle contact portion 125b and the sub paddle contact portion 126b, occurrence of a loop in the recording material S1 is suppressed.
For example, the main paddle contact portion 125b is set to rotate at an angular velocity that is 10% faster than the angular velocity of the sub paddle contact portion 126b. Here, when the main paddle contact portion 125b is too faster than a predetermined speed ratio (for example, the speed ratio with the sub-paddle contact portion 126b is 30% or more), the main paddle contact portion 125b is between the main paddle contact portion 125b and the end guide 124b. Jam and misalignment of recording material bundles may occur. On the other hand, when the main paddle contact portion 125b is too slower than a predetermined speed ratio (for example, the speed ratio with the sub paddle contact portion 126b is 5% or less), the main paddle contact portion 125b and the sub paddle contact portion 126b are respectively With the bending and intermittent contact with the recording material, the angular velocity of the sub-paddle contact portion 126b can be higher than the angular velocity of the main paddle contact portion 125b.

  In other words, if the angular velocity of the main paddle contact portion 125b is set to be a high angular velocity, the occurrence rate of jamming or poor recording material bundle alignment between the main paddle contact portion 125b and the end guide 124b increases. obtain. Further, if the angular velocity of the sub-paddle contact portion 126b is set to be a slow angular velocity, the time until the trailing edge of the recording material reaches the main paddle contact portion 125b becomes longer, and the productivity is deteriorated.

  Next, the speed difference between the main paddle 125 and the sub paddle 126 will be further described with reference to FIGS. 4, 6, and 7. Here, FIG. 7 is a diagram showing a state when the sub-paddle contact portion 126b approaches the recording material on the recording material stacking table 124a. More specifically, the sub-paddle contact portion 126b shown in FIG. 7 is arranged at a position where contact with the recording material is started by approaching the recording material on the recording material stacking base 124a.

As shown in FIG. 7, as the sub-paddle support member 126c rotates around the sub-paddle support shaft 126d, the sub-paddle rotation shaft 126a approaches the recording material on the recording material stacking table 124a (direction C1 in FIG. 7). The speed of the sub paddle rotating shaft 126a at this time is set as a moving speed V1. The sub paddle rotating shaft 126a moves in the tangential direction of the arc centered on the sub paddle support shaft 126d.
The moving speed V1 is the speed component V1b in the Z2 direction in FIG. 7 which is the direction along the surface of the recording material stacking base 124a of the compiling stacking unit 124, and the speed in the direction intersecting (orthogonal) with the Z2 direction in FIG. Decomposed into component V1b.

Here, when the sub-paddle contact portion 126b approaches the recording material and comes into contact with the recording material surface, the speed of the recording material conveyed by the sub-paddle contact portion 126b is determined by the contact position of the sub-paddle contact portion 126b (the position indicated by the broken line in FIG. 4). 7), the speed component V1b in the Z2 direction of FIG. 7 is added to the speed of transporting the recording material while rotating (hereinafter referred to as sub-paddle transport speed).
On the other hand, unlike the sub paddle 126, the main paddle 125 (see FIG. 6) does not advance or retreat with respect to the recording material loading platform 124a of the compiling loading section 124.
Therefore, in the present embodiment, the speed at which the main paddle contact portion 125b transports the recording material (hereinafter referred to as main paddle transport speed) is larger than the sum of the sub paddle transport speed and the speed component V1b of the sub paddle 126. Set.

  Further, as shown in FIG. 6, when the sub-paddle contact portion 126b is in contact with the recording material in a state of being located closer to the non-contact position (solid line position in FIG. 4) than the contact position (broken line position in FIG. 4). The sub-paddle contact portion 126b can transport the recording material at a speed higher than the sub-paddle transport speed. Therefore, the main paddle conveyance speed may be set to be larger than the sum of the sub paddle conveyance speed and the speed component V1b of the sub paddle 126. For example, the absolute value of the main paddle transport speed may be set larger than the sum of the absolute value of the sub paddle transport speed and the absolute value of the moving speed V1 of the sub paddle rotating shaft 126a.

  As described above, in the present embodiment, the main paddle conveyance speed is set to be higher than the sub paddle conveyance speed, that is, a state in which tension is applied to the recording material between the main paddle 125 and the sub paddle 126 (tensile state). This suppresses the occurrence of loops in the recording material.

As shown in FIG. 7, if the speed at which the sub-paddle rotating shaft 126a moves away from the recording material on the recording material stacking table 124a (direction C2 in FIG. 7) is the moving speed V2, the moving speed V2 is The direction of movement is opposite to the moving speed V1 at which the rotating shaft 126a approaches. That is, the moving speed V2 is a speed in a direction in which the speed at which the recording material is transported by the sub-paddle contact portion 126b is slower than the sub-paddle transport speed.
Therefore, if the main paddle transport speed is determined based on the moving speed V1 when the sub paddle 126 approaches as described above, the sub paddle rotating shaft 126a is separated from the recording material on the recording material stacking base 124a (FIG. 7). Also in the (C2 direction), the main paddle conveyance speed is suppressed from becoming lower than the sub-paddle conveyance speed, and the occurrence of a loop in the recording material is suppressed.

  In the above example, the sub-paddle 126 is used as the member for conveying the recording material. However, the configuration is not limited to the configuration of the sub-paddle 126 as long as it is a member that contacts the recording material while being bent and conveys the recording material, and can move between a position that contacts the recording material and a position that retracts from the recording material. For example, it may be a transport roll that has a cylindrical flexible member and transports the recording material by rotating the cylindrical member in contact with the recording material.

  Further, in order to move the sub paddle contact portion 126b between a position in contact with the recording material and a non-contact position not in contact with the recording material, the sub paddle support member 126c is swung by a moving mechanism (not shown) composed of a cam or the like. explained. However, if the sub-paddle contact portion 126b is configured to be able to advance and retreat with respect to the recording material loaded on the compilation stacking portion 124, the sub-paddle rotation shaft 126a is moved by, for example, a solenoid connected to the sub-paddle rotation shaft 126a. It may be a configuration.

DESCRIPTION OF SYMBOLS 1 ... Image forming system, 2 ... Image forming apparatus, 3 ... Post-processing apparatus, 124 ... Compile stacking part, 125 ... Main paddle, 125a ... Main paddle rotating shaft, 125b ... Main paddle contact part, 126 ... Sub paddle, 126a ... Sub paddle rotating shaft, 126b ... sub paddle contact portion, 126c ... sub paddle support member, 126d ... sub paddle support shaft, 200 ... control unit

Claims (4)

The recording material is transported while being intermittently brought into contact with the recording material by being rotatably provided, and is moved between a transport position for transporting the recording material and a separation position separated from the transport path of the recording material. One transport section;
The recording material is conveyed while being in intermittent contact with the recording material by being rotatably provided, and the recording material conveyed from the first conveyance unit is recorded at the conveyance position by the first conveyance unit. A second transport unit that transports at a speed faster than the sum of the speed of transporting the material and the speed in the recording material transport direction when the first transport unit moves from the separation position to the transport position ;
An aligning unit that forms a recording material bundle while abutting the end of the recording material conveyed from the second conveying unit and aligning the end of the recording material;
A post-processing device comprising: The second conveying unit, the post-processing according to claim 1, characterized in that said first conveyor is arranged at a position capable of recording material being conveyed conveyed together with the first conveyor apparatus. Wherein the first transport unit, the post-processing apparatus according to claim 1 or 2, wherein the moving between the said spaced position and the transport position while maintaining a state where the rotation. An image forming unit for forming an image on a recording material;
The recording material on which the image is formed by the image forming unit is conveyed while being rotated and rotated so as to rotate, and the recording material is conveyed from a conveyance position and a conveyance path of the recording material. A first transport unit that moves between the separated positions,
The recording material is conveyed while being in intermittent contact with the recording material by being rotatably provided, and the recording material conveyed from the first conveyance unit is recorded at the conveyance position by the first conveyance unit. A second transport unit that transports at a speed faster than the sum of the speed of transporting the material and the speed in the recording material transport direction when the first transport unit moves from the separation position to the transport position ;
An image forming system comprising: an aligning unit that forms a recording material bundle while abutting an end of the recording material conveyed from the second conveying unit to align the end of the recording material.

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