JP2019011202A - Pressing device, image forming system - Google Patents

Abstract

To provide a small and low-cost sheet processing device with high productivity as a device for pressing a sheet.SOLUTION: A pressing portion that presses a sheet while rotating around a rotation axis and has a pressing member disposed over a predetermined range in a rotation axis direction so that a position in a rotating direction around the rotation axis differs according to the direction of the rotation axis, presses the sheet along the rotation axis direction at a timing corresponding to a position where the pressing member is disposed, by rotating around the rotation axis.SELECTED DRAWING: Figure 17

Description

  The present invention relates to a sheet processing apparatus, an image forming system, and a sheet processing method.

  In recent years, there has been a tendency to digitize information, and image processing apparatuses such as printers and facsimiles used for outputting digitized information and scanners used for digitizing documents have become indispensable devices. Such an image processing apparatus is often configured as a multifunction machine that can be used as a printer, a facsimile, a scanner, or a copier by providing an imaging function, an image forming function, a communication function, and the like.

  Among such multi-function machines, a multi-function machine equipped with a folding processing device that draws an image by forming an image on a fed sheet and then folds the image-formed paper is known. It has been. When a folding process is performed on a sheet in such a folding processing apparatus, the fold is weak and incomplete, and the fold height is high. Therefore, in such a multi-function machine, in addition to the folding processing device, by applying an additional folding process to reinforce the fold by pressing the fold formed by the folding process, the fold is reinforced and the fold height is increased. There is known a multi-function machine equipped with an additional folding device that reduces the thickness (for example, see Patent Documents 1 and 2).

  By the way, when a folding process is performed on a sheet in the above-described folding processing apparatus, generally, the fold line is a direction perpendicular to the sheet transport direction (hereinafter also referred to as “sub-scanning direction”) ( (Hereinafter also referred to as “main scanning direction”).

  Therefore, as a method of performing the additional folding process in the additional folding apparatus as described above, for example, a sheet having a length of about the width of a sheet horizontally mounted in a direction parallel to the fold formed by the folding process (main scanning direction). There is a method of pressing a crease formed on the sheet while the sheet is conveyed by the additional folding roller.

  Further, as another method of performing the additional folding process in the additional folding apparatus as described above, for example, the conveyance of the paper is temporarily stopped at the position where the additional folding process is performed, and the direction perpendicular to the fold formed by the folding process is performed. By moving the additional folding roller that rotates about the (sub-scanning direction) in the main scanning direction on the stopped paper, the folds formed on the paper are sequentially pressed in the main scanning direction. A method is mentioned.

  However, in the former of the above-described additional folding processing methods, it is necessary to arrange a plurality of additional folding rollers in the sheet conveyance direction. This is because the entire crease is simultaneously pressed by one additional folding roller, and the pressing force is distributed over the entire crease, so that the pressing force per unit area is reduced, and a single additional folding roller has a sufficient additional folding effect. This is because cannot be obtained. Therefore, in the method of pressing a crease formed on a sheet while the sheet is conveyed by an additional folding roller having a length of about the width of the sheet horizontally mounted in the main scanning direction, a plurality of additional folding rollers are arranged. Therefore, there is a problem in that the multifunction machine becomes large and the drive system and the control system for driving those additional folding rollers increase, so that the initial cost and the running cost are increased.

  On the other hand, in the latter of the above-described additional folding processing methods, the entire crease area is sequentially pressed by one additional folding roller in the main scanning direction, so that a concentrated pressing force can be applied over the entire crease area. Therefore, although the pressing force is not dispersed, it is necessary to move the additional folding roller from one end to the other end in the sheet width direction while the sheet is stopped during the additional folding process. Therefore, by moving the additional folding roller rotating around the sub-scanning direction as the rotation axis in the main scanning direction on the stopped paper, the folds formed on the paper are sequentially pressed in the main scanning direction. In this method, there is a problem that it takes time for the additional folding roller to move from one end to the other end in the paper width direction, and productivity is lowered. The above-described problem is not limited to the sheet for image formation output, and can be similarly a problem if it is a sheet-like object. Further, not only when the fold of the folded sheet is reinforced, but also when the sheet is pressed, the problem can be caused similarly.

  SUMMARY An advantage of some aspects of the invention is that it provides a sheet processing apparatus that is highly productive, small, and low in cost as an apparatus for pressing a sheet.

  In order to solve the above-described problem, one aspect of the present invention includes a pressing portion that presses a sheet while rotating around a rotation shaft, and the pressing portion is disposed over a predetermined range in the rotation shaft direction. The pressing member is arranged such that a position in a rotation direction around the rotation axis is different depending on the rotation axis direction.

  ADVANTAGE OF THE INVENTION According to this invention, as a device for pressing a sheet | seat, a highly productive and small and low-cost sheet processing apparatus can be provided.

1 is a diagram schematically illustrating an overall configuration of an image forming apparatus according to an embodiment of the present invention. 1 is a block diagram schematically illustrating a hardware configuration of an image forming apparatus according to an embodiment of the present invention. 1 is a block diagram schematically illustrating a functional configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of the folding processing unit and the additional folding processing unit when the folding processing unit and the additional folding processing unit according to the embodiment of the present invention are executing the folding processing and the additional folding processing, respectively, as viewed from the main scanning direction. . FIG. 4 is a cross-sectional view of the folding processing unit and the additional folding processing unit when the folding processing unit and the additional folding processing unit according to the embodiment of the present invention are executing the folding processing and the additional folding processing, respectively, as viewed from the main scanning direction. . FIG. 4 is a cross-sectional view of the folding processing unit and the additional folding processing unit when the folding processing unit and the additional folding processing unit according to the embodiment of the present invention are executing the folding processing and the additional folding processing, respectively, as viewed from the main scanning direction. . It is a figure which shows an example of the shape of the folding-processed paper which was folded by the folding processing unit which concerns on embodiment of this invention. It is the perspective view which looked at the additional folding roller which concerns on embodiment of this invention from the diagonally upper side of the main scanning direction. It is the front view which looked at the additional folding roller which concerns on embodiment of this invention from the subscanning direction. It is the side view which looked at the additional folding roller which concerns on embodiment of this invention from the main scanning direction. It is the perspective view which looked at the additional folding roller which concerns on embodiment of this invention from the diagonally upper side of the main scanning direction. It is the front view which looked at the additional folding roller which concerns on embodiment of this invention from the subscanning direction. It is the side view which looked at the additional folding roller which concerns on embodiment of this invention from the main scanning direction. It is the perspective view which looked at the additional folding roller which concerns on embodiment of this invention from the diagonally upper side of the main scanning direction. It is the front view which looked at the additional folding roller which concerns on embodiment of this invention from the subscanning direction. It is the side view which looked at the additional folding roller which concerns on embodiment of this invention from the main scanning direction. It is the perspective view which looked at the additional folding roller which concerns on embodiment of this invention from the diagonally upper side of the main scanning direction. It is the front view which looked at the additional folding roller which concerns on embodiment of this invention from the subscanning direction. It is the side view which looked at the additional folding roller which concerns on embodiment of this invention from the main scanning direction. It is the figure which looked at the pressing force transmission part which concerns on embodiment of this invention from the main scanning direction in the state arrange | positioned at the additional folding roller rotating shaft. It is sectional drawing which looked at only the mechanism part in connection with the additional folding process in the additional folding process unit when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process from the main scanning direction. It is sectional drawing which looked at only the mechanism part in connection with the additional folding process in the additional folding process unit when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process from the main scanning direction. FIG. 10 is a diagram illustrating a change with time of a sheet conveyance speed and a rotation speed of an additional folding roller when the additional folding processing unit according to the embodiment of the present invention is performing additional folding processing. It is sectional drawing which looked at only the mechanism part in connection with the additional folding process in the additional folding process unit when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process from the main scanning direction. It is sectional drawing which looked at only the mechanism part in connection with the additional folding process in the additional folding process unit when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process from the main scanning direction. FIG. 10 is a diagram illustrating a change with time of a sheet conveyance speed and a rotation speed of an additional folding roller when the additional folding processing unit according to the embodiment of the present invention is performing additional folding processing. It is a figure for demonstrating the method for suppressing the collision sound of the additional folding roller and the paper support plate in the additional folding processing unit which concerns on embodiment of this invention. It is a figure for demonstrating the method for suppressing the collision sound of the additional folding roller and the paper support plate in the additional folding processing unit which concerns on embodiment of this invention. It is a figure for demonstrating the method for suppressing the collision sound of the additional folding roller and the paper support plate in the additional folding processing unit which concerns on embodiment of this invention. It is a figure for demonstrating the method for suppressing the collision sound of the additional folding roller and the paper support plate in the additional folding processing unit which concerns on embodiment of this invention. It is a figure for demonstrating the method for suppressing the collision sound of the additional folding roller and the paper support plate in the additional folding processing unit which concerns on embodiment of this invention. It is a graph which shows the load to the additional folding roller rotating shaft when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process operation. It is a figure for demonstrating the rotational moment concerning an additional folding roller rotating shaft when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process operation. It is a graph which shows the load torque to the additional folding roller drive motor when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process operation. It is a graph which shows the load torque to the additional folding roller drive motor when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process operation. It is a graph which shows the load torque to the additional folding roller drive motor when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process operation. It is a graph which shows the load torque to the additional folding roller drive motor when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process operation. It is a graph which shows the load torque to the additional folding roller drive motor when the additional folding process unit which concerns on embodiment of this invention is performing the additional folding process operation. It is the figure which looked at the additional folding roller drive device concerning the embodiment of the present invention from the main scanning direction. It is a perspective view of the additional folding roller drive device concerning the embodiment of the present invention. It is the figure which looked at the additional folding roller drive device concerning the embodiment of the present invention from the main scanning direction. It is a perspective view of the additional folding roller drive device concerning the embodiment of the present invention. It is a perspective view of the stop device concerning the embodiment of the present invention. It is the permeation | transmission figure which looked at the stop apparatus which concerns on embodiment of this invention from the direction perpendicular | vertical to the plane formed in the main scanning direction and a subscanning direction. It is the figure which looked at the stop device concerning the embodiment of the present invention from the main scanning direction. It is a perspective view which shows the additional folding roller which concerns on embodiment of this invention from the diagonally upper side of the main scanning direction. It is a front view which shows the additional folding roller which concerns on embodiment of this invention from a subscanning direction. It is a side view which shows the additional folding roller which concerns on embodiment of this invention from the main scanning direction. It is an expanded view of the additional folding roller which concerns on embodiment of this invention. It is a perspective view which shows the additional folding roller which concerns on embodiment of this invention from the diagonally upper side of the main scanning direction. It is a front view which shows the additional folding roller which concerns on embodiment of this invention from a subscanning direction. It is a side view which shows the additional folding roller which concerns on embodiment of this invention from the main scanning direction. It is an expanded view of the additional folding roller which concerns on embodiment of this invention. It is a side view which shows the paper support plate which concerns on embodiment of this invention from the main scanning direction.

Embodiment 1 FIG.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, after image formation is performed on a fed sheet, a direction (hereinafter referred to as “main scanning direction”) perpendicular to the sheet conveyance direction (hereinafter also referred to as “sub-scanning direction”) with respect to the image-formed sheet. In order to reinforce the crease formed by the folding process and reduce the folding height, the crease formed by the folding process is increased and pressed by the folding roller. Thus, an image forming apparatus that performs additional folding processing will be described as an example.

  In such an image forming apparatus, one of the gist according to the present embodiment is that the additional folding roller sequentially presses the creases toward the main scanning direction while rotating about an axis parallel to the main scanning direction. It is configured to go.

  Therefore, the image forming apparatus according to the present embodiment can apply a concentrated pressing force over the entire crease in a short time. Therefore, the image forming apparatus according to the present embodiment can apply a sufficient pressing force to the fold line without reducing productivity while reducing the load on the rotation shaft of the additional folding roller. As a result, it is possible to provide an additional folding device that is highly productive, small, and low in cost.

  First, the overall configuration of the image forming apparatus 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a simplified overall configuration of an image forming apparatus 1 according to the present embodiment. As shown in FIG. 1, the image forming apparatus 1 according to the present embodiment includes an image forming unit 2, a folding processing unit 3, an additional folding processing unit 4, and a scanner unit 5.

  The image forming unit 2 generates CMYK (Cyan Magenta Yellow Key Plate) drawing information based on the input image data, and performs image forming output on the fed paper based on the generated drawing information. Run. The folding processing unit 3 executes folding processing on the image-formed paper conveyed from the image forming unit 2. The additional folding processing unit 4 performs additional folding processing on the folds formed on the folded paper that has been conveyed from the folding processing unit 3. That is, in the present embodiment, the additional folding processing unit 4 functions as a sheet processing apparatus.

  The scanner unit 5 reads a document by a linear image sensor in which a plurality of photodiodes are arranged in a line and a light receiving element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) image sensor is arranged in parallel. This will digitize the manuscript. The image forming apparatus 1 according to the present embodiment is an MFP (Multi Function Peripheral) that can be used as a printer, a facsimile, a scanner, and a copier by providing an imaging function, an image forming function, a communication function, and the like. .

  Next, a hardware configuration of the image forming apparatus 1 according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram schematically illustrating a hardware configuration of the image forming apparatus 1 according to the present embodiment. The image forming apparatus 1 includes an engine for realizing a scanner, a printer, a folding process, an additional folding process, and the like in addition to the hardware configuration shown in FIG.

  As shown in FIG. 2, the image forming apparatus 1 according to the present embodiment includes the same configuration as a general server, a PC (Personal Computer), or the like. That is, the image forming apparatus 1 according to the present embodiment includes a CPU (Central Processing Unit) 10, a RAM (Random Access Memory) 20, a ROM (Read Only Memory) 30, an HDD (Hard Disk Drive) 40, and an I / F 50. 90 is connected. Further, an LCD (Liquid Crystal Display) 60, an operation unit 70, and a dedicated device 80 are connected to the I / F 50.

  The CPU 10 is a calculation unit and controls the operation of the entire image forming apparatus 1. The RAM 20 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 10 processes information. The ROM 30 is a read-only nonvolatile storage medium and stores a program such as firmware. The HDD 40 is a non-volatile storage medium that can read and write information, and stores an OS (Operating System), various control programs, application programs, and the like.

  The I / F 50 connects and controls the bus 90 and various hardware and networks. The LCD 60 is a visual user interface for the user to check the state of the image forming apparatus 1. The operation unit 70 is a user interface such as a keyboard and a mouse for the user to input information to the image forming apparatus 1.

  The dedicated device 80 is hardware for realizing dedicated functions in the image forming unit 2, the folding processing unit 3, the additional folding processing unit 4, and the scanner unit 5. In the image forming unit 2, an image is formed on a paper surface. A plotter device that executes output. The folding processing unit 3 includes a transport mechanism for transporting paper and a folding processing mechanism for folding the transported paper.

  Further, the additional folding processing unit 4 is an additional folding processing mechanism for reinforcing the folds of the paper that is conveyed after being folded by the folding processing unit 3. The scanner unit 5 is a reading device that reads an image displayed on a sheet. The configuration of the additional folding processing mechanism included in the additional folding processing unit 4 is one of the gist according to the present embodiment.

  In such a hardware configuration, a program stored in a storage medium such as the ROM 30, the HDD 40, or an optical disk (not shown) is read into the RAM 20, and the CPU 10 performs an operation according to the program loaded into the RAM 20, whereby the software control unit Is configured. A functional block that realizes the functions of the image forming apparatus 1 according to the present embodiment is configured by a combination of the software control unit configured as described above and hardware.

  Next, the functional configuration of the image forming apparatus 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a block diagram schematically illustrating a functional configuration of the image forming apparatus 1 according to the present embodiment. In FIG. 3, the electrical connection is indicated by a solid arrow, and the flow of a sheet or a document bundle is indicated by a broken arrow.

  As shown in FIG. 3, the image forming apparatus 1 according to the present embodiment includes a controller 100, a paper feed table 110, a print engine 120, a folding processing engine 130, an additional folding processing engine 140, a scanner engine 150, an ADF (Auto Document Feeder). : Automatic document feeder) 160, paper discharge tray 170, display panel 180, and network I / F 190. The controller 100 includes a main control unit 101, an engine control unit 102, an input / output control unit 103, an image processing unit 104, and an operation display control unit 105.

  The paper feed table 110 feeds paper to the print engine 120 that is an image forming unit. The print engine 120 is an image forming unit provided in the image forming unit 2, and draws an image by executing an image forming output on a sheet conveyed from the sheet feeding table 110. As a specific aspect of the print engine 120, an image forming mechanism using an ink jet method, an image forming mechanism using an electrophotographic method, or the like can be used. The image-formed paper on which an image is drawn by the print engine 120 is conveyed to the folding processing unit 3 or discharged onto the paper discharge tray 170.

  The folding processing engine 130 is provided in the folding processing unit 3 and performs a folding process on the image-formed paper conveyed from the image forming unit 2. The folding-processed paper that has been subjected to the folding process by the folding processing engine 130 is conveyed to the additional folding processing unit 4. The additional folding processing engine 140 is provided in the additional folding processing unit 4, and performs additional folding processing on the folds formed on the folded paper conveyed from the folding processing engine 130. The additional folding processed paper subjected to the additional folding processing by the additional folding processing engine 140 is discharged to the paper discharge tray 170, or post-processing (not shown) that executes post-processing such as stapling, punching, and bookbinding processing. It is transported to the unit.

  The ADF 160 is provided in the scanner unit 5 and automatically conveys a document to a scanner engine 150 serving as a document reading unit. The scanner engine 150 is a document reading unit that is provided in the scanner unit 5 and includes a photoelectric conversion element that converts optical information into an electric signal. The scanner engine 150 is set on a document that is automatically conveyed by the ADF 160 or a document table glass (not shown). The original is optically scanned and read to generate image information. A document that is automatically conveyed by the ADF 160 and read by the scanner engine 150 is discharged to a discharge tray 170.

  The display panel 180 is an output interface that visually displays the state of the image forming apparatus 1 and is an input when the user directly operates the image forming apparatus 1 or inputs information to the image forming apparatus 1 as a touch panel. It is also an interface. That is, the display panel 180 includes a function for displaying an image for receiving an operation by the user. The display panel 180 is realized by the LCD 60 and the operation unit 70 shown in FIG.

  The network I / F 190 is an interface for the image forming apparatus 1 to communicate with other devices such as an administrator terminal via the network. The network I / F 190 is an Ethernet (registered trademark), a USB (Universal Serial Bus) interface, or a Bluetooth (registered). Trademarks), Wi-Fi (Wireless Fidelity), FeliCa (registered trademark), and other interfaces are used. The network I / F 190 is realized by the I / F 50 shown in FIG.

  The controller 100 is configured by a combination of software and hardware. Specifically, a software control unit and an integrated circuit configured by loading a control program such as firmware stored in a non-volatile storage medium such as the ROM 30 or the HDD 40 into the RAM 20 and performing an operation by the CPU 10 according to the program. The controller 100 is configured by hardware such as the above. The controller 100 functions as a control unit that controls the entire image forming apparatus 1.

  The main control unit 101 plays a role of controlling each unit included in the controller 100, and gives a command to each unit of the controller 100. The main control unit 101 also controls the input / output control unit 103 to access other devices via the network I / F 190 and the network. The engine control unit 102 controls or drives driving units such as the print engine 120, the folding processing engine 130, the additional folding processing engine 140, and the scanner engine 150. The input / output control unit 103 inputs signals and commands input via the network I / F 190 and the network to the main control unit 101.

  The image processing unit 104 generates drawing information based on document data or image data included in the input print job in accordance with control of the main control unit 101. The drawing information is data such as CMYK bitmap data, and is information for drawing an image to be formed by the print engine 120 serving as an image forming unit in an image forming operation. Further, the image processing unit 104 processes image data input from the scanner engine 150 to generate image data. The image data is information stored in the image forming apparatus 1 as a result of the scanner operation or transmitted to another device via the network I / F 190 and the network. The operation display control unit 105 displays information on the display panel 180 or notifies the main control unit 101 of information input via the display panel 180.

  Next, an operation example when the folding processing unit 3 and the additional folding processing unit 4 according to the present embodiment perform the folding processing and the additional folding processing, respectively, will be described with reference to FIGS. 4 to 6 are main scans of the folding processing unit 3 and the additional folding processing unit 4 when the folding processing unit 3 and the additional folding processing unit 4 according to the present embodiment are executing the folding processing and the additional folding processing, respectively. It is sectional drawing seen from the direction. The operation of each operation unit described below is performed under the control of the main control unit 101 and the engine control unit 102.

  When the image forming apparatus 1 according to the present embodiment performs the folding processing operation in the folding processing unit 3, first, as shown in FIG. 4A, the folding processing unit 3 starts from the image forming unit 2 to the entrance roller pair 310. Thus, the image-formed sheet 6 conveyed to the folding processing unit 3 is conveyed toward the conveyance path switching claw 330 while correcting the registration in the main scanning direction by the registration roller pair 320 and measuring the conveyance timing.

  As shown in FIG. 4B, the folding processing unit 3 uses the conveyance path switching claw 330 to transfer the sheet 6 conveyed to the conveyance path switching claw 330 by the registration roller pair 320 to the first folding processing conveyance roller pair 340. To guide. As shown in FIG. 4C, the folding processing unit 3 causes the first folding processing transport roller pair 340 to feed the sheet 6 guided to the first folding processing transport roller pair 340 by the transport path switching claw 330. It is conveyed toward the second folding processing conveyance roller pair 350.

  As shown in FIG. 5A, the folding processing unit 3 conveys the sheet 6 conveyed to the second folding processing conveyance roller pair 350 by the first folding processing conveyance roller pair 340 in the first folding processing conveyance. Further conveyance is performed by the roller pair 340 and the second folding processing conveyance roller pair 350. As shown in FIG. 5B, the folding processing unit 3 measures the timing of folding the paper 6 at a predetermined position and reverses the rotation direction of the second folding processing conveyance roller pair 350 to thereby remove the paper 6. The first folding processing conveyance roller pair 340 and the second folding processing conveyance roller pair 350 make the sheet 6 into a creased conveyance roller pair 360 so that the bending position is not changed while the deflection is made at the predetermined position. Transport toward you.

  At this time, in the folding processing unit 3, the main control unit 101 and the engine control unit 102 control each unit based on the conveyance speed of the paper 6 and the sensor information input from the sensor 370 so that the timing is measured. It has become.

  As shown in FIG. 5C, the folding processing unit 3 transfers the sheet 6 conveyed to the crease conveying roller pair 360 by the second folding processing conveyance roller pair 350 and the crease conveying roller pair 360 in the conveying direction. , The sheet 6 is bent and the crease is formed at the predetermined position, and the sheet 6 is conveyed toward the gap between the additional folding roller 410 and the sheet support plate 420 of the additional folding processing unit 4. . As shown in FIGS. 4 and 5, in the present embodiment, one of the first folding processing conveyance roller pair 340 also serves as one of the creased conveyance roller pair 360.

  An example of the shape of the paper 6 subjected to the folding process in this way is shown in FIGS. FIGS. 7A to 7H are diagrams illustrating an example of the shape of the folded paper 6 that has been subjected to the folding processing by the folding processing unit 3 according to the present embodiment.

  Then, as illustrated in FIG. 6A, the additional folding processing unit 4 transports the paper 6 that has been conveyed to the gap between the additional folding roller 410 and the paper support plate 420 by the pair of crease-conveying rollers 360. Thus, the folds formed on the paper 6 are supported in the pressing direction, and the folding roller 410 is pressed while rotating in the conveying direction to perform additional folding. That is, in this embodiment, the additional folding roller 410 functions as a pressing portion, and the paper support plate 420 functions as a sheet support portion.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 have the folding information regarding the folding method in the folding processing unit 3, the sheet information regarding the size of the sheet 6, the conveyance speed of the sheet 6, and the additional folding roller 410. By controlling each part based on the rotation speed, the timing for pressing the paper 6 is measured. Alternatively, at this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 make the respective units based on the conveyance speed of the paper 6, the rotational speed of the additional folding roller 410, and sensor information input from the sensor 430. By controlling, the timing of pressing the paper 6 is measured.

  As shown in FIGS. 4 to 6, the additional folding roller 410 is driven by the driving force of the additional folding roller driving motor 471 transmitted from the additional folding roller driving device 470 via the timing belt 472. The paired feed roller pair 360 is driven by a crease feed roller driving motor (not shown). The driving of the additional folding roller driving motor 471 and the driving of the crease-conveying roller driving motor are performed under the control of the engine control unit 102. That is, in this embodiment, the additional folding roller drive motor 471 functions as a rotation drive braking unit, and the engine control unit 102 functions as a rotation control unit and a conveyance control unit.

  As described above, when the additional folding processing unit 4 performs additional folding by pressing the fold formed on the paper 6 with the additional folding roller 410, the additional folding processing conveyance roller 4 Transport toward pair 440.

  As shown in FIG. 6B, the additional folding processing unit 4 discharges the additional folded paper 6 conveyed from the gap between the additional folding roller 410 and the paper support plate 420 as it is. The sheet 6 is added and conveyed toward the paper discharge roller pair 450 by the folding processing conveyance roller pair 440. Then, the additional folding processing unit 4 discharges the additional folding processed paper 6 conveyed to the discharge roller pair 450 by the additional folding processing conveyance roller pair 440 to the discharge tray 170 by the discharge roller pair 450. . Thereby, the folding processing operation and the additional folding processing operation in the folded image forming apparatus 1 according to the present embodiment are completed.

  On the other hand, as shown in FIG. 6C, the additional folding processing unit 4 performs stapling, punching, etc. on the additional folding processed paper 6 conveyed from the gap between the additional folding roller 410 and the paper support plate 420. When post-processing such as bookbinding processing is performed, the sheet 6 is added and conveyed toward the post-processing conveyance roller pair 460 by the folding processing conveyance roller pair 440. Then, the additional folding processing unit 4 transfers the sheet 6 subjected to the additional folding process, which has been conveyed to the post-processing conveyance roller pair 460 by the additional folding processing conveyance roller pair 440, to a post-processing unit (not shown) by the post-processing conveyance roller pair 460. Transport. Thereby, the folding processing operation and the additional folding processing operation in the folded image forming apparatus 1 according to the present embodiment are completed.

  Next, structural examples of the additional folding roller 410 according to the present embodiment will be described with reference to FIGS. 8 to 10, FIGS. 11 to 13, FIGS. 14 to 16, and FIGS.

  First, a first structural example of the additional folding roller 410 according to the present embodiment will be described with reference to FIGS. FIG. 8 is a perspective view of the additional folding roller 410 according to the present embodiment when viewed obliquely from above and in the main scanning direction. FIG. 9 is a front view of the additional folding roller 410 according to the present embodiment as viewed from the sub-scanning direction. FIG. 10 is a side view of the additional folding roller 410 according to the present embodiment as viewed from the main scanning direction.

  As shown in FIGS. 8 to 10, the additional folding roller 410 according to this embodiment has a plurality of pressing force transmission parts 412 that are constant in the rotational direction of the additional folding roller rotating shaft 411 as shown in FIGS. 8 to 10. Are arranged at regular intervals in the main scanning direction around the additional folding roller rotation shaft 411.

  Here, the additional folding roller rotating shaft 411 is a rotating shaft of the additional folding roller 410 that is horizontally mounted on the additional folding processing unit 4 in the main scanning direction and rotates around an axis penetrating in the main scanning direction. Reference numeral 412 denotes a pressing member for expanding and contracting in a specific direction and transmitting a pressing force to a fold formed on the paper 6 by an elastic force when expanding and contracting.

  If the additional folding roller 410 according to this embodiment is configured as shown in FIGS. 8 to 10, the additional folding roller 410 can sequentially press the fold from one end to the other end. It becomes possible to prevent the occurrence of folding wrinkles.

  Next, a second structural example of the additional folding roller 410 according to the present embodiment will be described with reference to FIGS. 11 to 13. FIG. 11 illustrates the additional folding roller 410 according to the present embodiment obliquely in the main scanning direction. It is the perspective view seen from the upper side. FIG. 12 is a front view of the additional folding roller 410 according to this embodiment as seen from the sub-scanning direction. FIG. 13 is a side view of the additional folding roller 410 according to this embodiment as seen from the main scanning direction.

  As shown in FIGS. 11 to 13, the additional folding roller 410 according to the present embodiment includes, as shown in FIGS. 11 to 13, an odd number of pressing force transmission portions 412, the center of the additional folding roller rotating shaft 411 in the main scanning direction. Are arranged around the additional folding roller rotating shaft 411 at a constant interval in the main scanning direction with a certain angular difference in the rotational direction of the additional folding roller rotating shaft 411.

  Next, a third structural example of the additional folding roller 410 according to the present embodiment will be described with reference to FIGS. FIG. 14 is a perspective view of the additional folding roller 410 according to this embodiment as viewed obliquely from above and in the main scanning direction. FIG. 15 is a front view of the additional folding roller 410 according to this embodiment as seen from the sub-scanning direction. FIG. 16 is a side view of the additional folding roller 410 according to this embodiment as viewed from the main scanning direction.

  As shown in FIGS. 14 to 16, the additional folding roller 410 according to the present embodiment is a third structural example, and the even number of pressing force transmission parts 412 are based on the center of the additional folding roller 410 in the main scanning direction. Are arranged at regular intervals around the additional folding roller rotating shaft 411 with a constant angular difference in the rotational direction of the additional folding roller rotating shaft 411.

  Next, a fourth structure example of the additional folding roller 410 according to the present embodiment will be described with reference to FIGS. 17 to 19. FIG. 17 is a perspective view of the additional folding roller 410 according to this embodiment as viewed obliquely from above and in the main scanning direction. FIG. 18 is a front view of the additional folding roller 410 according to this embodiment as seen from the sub-scanning direction. FIG. 19 is a side view of the additional folding roller 410 according to the present embodiment as viewed from the main scanning direction.

  As shown in FIGS. 17 to 19, the additional folding roller 410 according to the present embodiment is arranged on the rotational shaft of the additional folding roller as shown in FIGS. 17 to 19 as shown in FIGS. 17 to 19. 14 and 16 are arranged in a spiral manner with a predetermined angle difference in the rotation direction of the additional folding roller rotating shaft 411. It is configured in an arrangement mode. When the additional folding roller 410 according to the present embodiment is configured as shown in FIGS. 17 to 19, the additional folding roller 410 has no gap in the main scanning direction, that is, the entire fold formed on the sheet 6. It is possible to press without any gap.

  Further, when the additional folding roller 410 according to the present embodiment is configured as shown in FIGS. 11 to 13, 14 to 16, and 17 to 19, the additional folding roller 410 has both ends of the fold line from the center. Therefore, it is possible to prevent the occurrence of folding wrinkles.

  Next, a structural example of the pressing force transmission unit 412 will be described with reference to FIGS. 20 (a) and 20 (b). 20A and 20B are views of the pressing force transmission unit 412 according to the present embodiment as viewed from the main scanning direction in a state where the pressing force transmission unit 412 is disposed on the additional folding roller rotation shaft 411. FIG. As shown in FIG. 20A, the pressing force transmission part 412 according to this embodiment includes a fixing part 412a for fixing the pressing force transmission part 412 around the folding roller rotating shaft 411, and a fixing part 412a. An elastic body 412b that is attached and expands and contracts to produce an elastic force in the expansion and contraction direction, and a pressing roller 412c that is mounted on the elastic body 412b and that rotates around an axis that penetrates in the main scanning direction. Is done.

  As described above, the pressing force transmission unit 412 is configured to include the elastic body 412b. Assuming that the elastic body 412b is a rigid body, the additional folding roller 410 has any one of the pressing force transmission units 412. This is because it becomes impossible to rotate at the point of contact with the paper support plate 420. That is, in the present embodiment, the elastic body 412b functions as an elastic body that generates an elastic force corresponding to the amount of change when the physical shape changes.

  20A shows an example in which the elastic body 412b is configured by a leaf spring. However, the elastic body 412b may also be configured by elasticity of a compression spring, rubber, sponge, plastic resin, or the like. .

  The additional folding processing unit 4 according to the present embodiment rotates the additional folding roller 410 configured as described above with the additional folding roller rotation shaft 411 as the rotation axis during the additional folding processing, so that the main folding direction of the sheet is increased in the main scanning direction. The formed folds can be sequentially pressed in the direction of the folds by the respective pressing force transmission portions 412.

  This is because the additional folding roller 410 according to the present embodiment has a plurality of pressing force transmission portions 412 mainly around the additional folding roller rotation shaft 411 with a certain angular difference in the rotation direction of the additional folding roller rotation shaft 411. This is because they are arranged at regular intervals in the scanning direction.

  For this reason, the additional folding processing unit 4 according to this embodiment does not distribute the pressing force over the entire region in the main scanning direction during the additional folding process, and the concentrated pressing force by each pressing force transmitting unit 412 Can be applied over the entire area.

  The elastic body 412b may be provided with a simple pressing rod 412d as shown in FIG. 20 (b) instead of the pressing roller 412c formed of a rotating body. However, when the pressing force transmitting portion 412 is configured in this way, the pressing rod 412d damages the paper 6 during pressing, and wear of the contact portion of the pressing rod 412d with the paper 6 becomes severe. However, if the contact portion of the pressing bar 412d with the sheet 6 is formed in a smooth shape and the frictional force of the contact portion is reduced, the above-described problem can be reduced.

  The additional folding processing unit 4 according to the present embodiment rotates the additional folding roller 410 configured as described above by using the additional folding roller rotation shaft 411 as a rotation axis, thereby causing each pressing force of the fold formed in the main scanning direction to be The transmission part 412 can be sequentially pressed toward the crease direction.

  Therefore, the additional folding processing unit 4 according to the present embodiment can apply the pressing force of each pressing force transmitting portion 412 in a concentrated manner over the entire fold in a short time. Therefore, the additional folding processing unit 4 according to the present embodiment can apply a sufficient pressing force to the fold without reducing the productivity while reducing the load on the additional folding roller rotating shaft 411. . As a result, it is possible to provide an additional folding device that is highly productive, small, and low in cost.

  Next, details of an operation example when the additional folding processing unit 4 according to the present embodiment performs additional folding processing will be described with reference to FIGS. FIGS. 21 and 22 are cross-sectional views of only a mechanism part related to the additional folding process in the additional folding processing unit 4 when the additional folding processing unit 4 according to the present embodiment is executing the additional folding process, as viewed from the main scanning direction. FIG. FIG. 23 is a diagram illustrating a temporal change in the conveyance speed of the sheet 6 and the rotation speed of the additional folding roller 410 when the additional folding processing unit 4 according to the present embodiment is executing the additional folding process. 21 to 23, an example in which additional folding processing is performed on the paper 6 on which the Z-fold having the first fold 6a and the second fold 6b is formed will be described. In addition, the operation of each operation unit described below is performed under the control of the main control unit 101 and the engine control unit 102.

  As shown in FIGS. 21A and 23, the additional folding processing unit 4 according to the present embodiment starts conveyance of the paper 6 in the additional folding processing unit 4, as shown in FIGS. 21B and 23. In addition, after the timing until the additional folding roller 410 contacts the first fold 6a formed on the paper 6 is calculated, the rotation of the additional folding roller 410 is started without waiting for the paper 6 to stop. As described above, the additional folding processing unit 4 according to the present embodiment starts the rotation of the additional folding roller 410 without waiting for the stop of the paper 6 because the additional folding roller 410 starts rotating and hits the paper 6. This is to shorten the time lag until contact. Thereby, the additional folding processing unit 4 according to the present embodiment can improve the productivity.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 have the folding information regarding the folding method in the folding processing unit 3, the sheet information regarding the size of the sheet 6, the conveyance speed of the sheet 6, and the additional folding roller 410. By controlling the respective parts based on the rotational speed of the sheet, the timing until the additional folding roller 410 comes into contact with the first crease 6a formed on the paper 6 is calculated. Alternatively, at this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 make the respective units based on the conveyance speed of the paper 6, the rotational speed of the additional folding roller 410, and sensor information input from the sensor 430. By controlling, the timing until the additional folding roller 410 comes into contact with the first crease 6a formed on the paper 6 is calculated.

  Then, as shown in FIGS. 21C and 23, the additional folding processing unit 4 conveys the sheet 6 until the first fold 6 a is positioned immediately below the additional folding roller rotation shaft 411. After the conveyance is completely stopped, the additional folding roller 410 starts to contact the first fold 6a formed on the sheet 6 to start pressing the first fold 6a. Then, as shown in FIGS. 21D and 23, the additional folding processing unit 4 continues to rotate the additional folding roller 410 while the paper 6 is stopped, thereby forming the first fold 6a formed on the paper 6. Continue pressing on.

  Thereafter, the additional folding processing unit 4 calculates the timing until the additional folding roller 410 is separated from the paper 6 as shown in FIGS. 21 (e) and 23, and does not wait for the additional folding roller 410 to stop. In addition, the conveyance of the paper 6 is started when the additional folding roller 410 is separated from the paper 6. As described above, the additional folding processing unit 4 according to this embodiment does not wait for the additional folding roller 410 to stop, and the conveyance of the paper 6 is started when the additional folding roller 410 is separated from the paper 6. This is to shorten the time lag from when the roller 410 leaves the paper 6 until it completely stops. Thereby, the additional folding processing unit 4 according to the present embodiment can improve the productivity.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 control each part based on the rotational speed of the additional folding roller 410 until the additional folding roller 410 is separated from the sheet 6. Timing is calculated.

  Then, when the additional folding processing unit 4 conveys the paper 6 separated from the additional folding roller 410, the second folding line in which the additional folding roller 410 is formed on the paper 6 as shown in FIGS. 22A and 23. After calculating the timing until contact with 6b, the reversing of the additional folding roller 410 is started without waiting for the sheet 6 to stop. In this way, the additional folding processing unit 4 according to the present embodiment starts the reversal of the additional folding roller 410 without waiting for the sheet 6 to stop, as in the case of FIG. This is to shorten the time lag from the start of rotation to the contact with the paper 6. Thereby, the additional folding processing unit 4 according to the present embodiment can improve the productivity.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 have the folding information regarding the folding method in the folding processing unit 3, the sheet information regarding the size of the sheet 6, the conveyance speed of the sheet 6, and the additional folding roller 410. By controlling each part based on the rotational speed of the first and second rotations, the timing until the additional folding roller 410 contacts the second crease 6b formed on the paper 6 is calculated. Alternatively, at this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 make the respective units based on the conveyance speed of the paper 6, the rotational speed of the additional folding roller 410, and sensor information input from the sensor 430. By controlling, the timing until the additional folding roller 410 comes into contact with the second fold 6b formed on the paper 6 is calculated.

  Then, as shown in FIGS. 22B and 23, the additional folding processing unit 4 conveys the sheet 6 until the first fold 6 b is positioned immediately below the additional folding roller rotation shaft 411. After the conveyance is completely stopped, the additional folding roller 410 starts to contact the first fold 6b formed on the paper 6 to start pressing the first fold 6a. Then, as shown in FIGS. 22C and 23, the additional folding processing unit 4 continues to rotate the additional folding roller 410 while the paper 6 is stopped, thereby forming the first fold 6a formed on the paper 6. Continue pressing on.

  Thereafter, the additional folding processing unit 4 calculates the timing until the additional folding roller 410 is separated from the paper 6 as shown in FIGS. 22D and 23, and then the additional folding roller 410 is separated from the paper 6. At that time, the conveyance of the paper 6 is started. As described above, the additional folding processing unit 4 according to this embodiment does not wait for the additional folding roller 410 to stop, and the conveyance of the paper 6 is started when the additional folding roller 410 is separated from the paper 6. FIG. This is to shorten the time lag from when the additional folding roller 410 separates the paper 6 until it completely stops, as in the case of (e). Thereby, the additional folding processing unit 4 according to the present embodiment can improve the productivity.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 control each part based on the rotational speed of the additional folding roller 410 until the additional folding roller 410 is separated from the sheet 6. Timing is calculated.

  Then, the additional folding processing unit 4 ends the additional folding process by conveying the paper 6 separated from the additional folding roller 410.

  If the additional folding roller 410 rotates in the direction opposite to the example shown in FIGS. 21 to 23, the additional folding roller 410 first contacts the paper support plate 420 at a timing corresponding to FIG. After the collision, the sheet 6 comes into contact. Therefore, when the additional folding roller 410 rotates in the direction opposite to the example shown in FIGS. 21 to 23, the additional folding processing unit 4 generates a collision sound between the additional folding roller 410 and the paper support plate 420. End up.

  On the other hand, in the example shown in FIGS. 21 to 23, the additional folding roller 410 abuts only on the paper 6, and thus indirectly collides with the paper support plate 420 via the paper 6. Accordingly, in the example shown in FIGS. 21 to 23, the sheet 6 functions as a cushioning material between the additional folding roller 410 and the sheet support plate 420, and the above-described collision noise can be suppressed. Become. Such an effect becomes easier to obtain particularly as the number of times the sheet 6 is folded. This is because as the number of folding of the sheet 6 increases, the overlapping of the sheets increases, so that the thickness increases and the buffering effect increases.

  Further, if the additional folding roller 410 rotates in the direction opposite to the example shown in FIGS. 21 to 23, the additional folding roller 410 first contacts the paper support plate 420 at a timing corresponding to FIG. Although it will contact | abut to the paper 6 after colliding, it will contact | abut toward the open part formed in the upper part of the 1st crease | fold 6a. Therefore, when the additional folding roller 410 rotates in the direction opposite to the example shown in FIGS. 21 to 23, there is a problem that folding wrinkles may occur in the paper 6. Such a problem tends to occur more prominently as the number of times the sheet 6 is folded. This is because as the number of folding of the sheet 6 increases, the overlapping of sheets increases and the thickness thereof increases.

  On the other hand, in the example shown in FIGS. 21 to 23, the additional folding roller 410 abuts from the opposite side of the opening formed at the upper part of the first fold 6a. Therefore, in the example shown in FIGS. 21 to 23, the problem that the paper 6 is wrinkled does not occur regardless of the number of times the paper 6 is folded. Such an effect can also be obtained at the timing corresponding to FIG.

  As described above, the additional folding processing unit 4 according to the present embodiment increases according to the paper type and thickness of the paper 6, the shape of the folded paper 6, the folding method, the number of folding, the position of the fold, and the like. By changing the rotation direction of the folding roller 410, it is possible to suppress collision noise and to prevent the occurrence of folding wrinkles.

  Next, details of another operation example when the additional folding processing unit 4 according to this embodiment performs additional folding processing will be described with reference to FIGS. 24 and 25 are cross-sectional views of only the mechanism portion related to the additional folding processing in the additional folding processing unit 4 when the additional folding processing unit 4 according to the present embodiment is executing the additional folding processing from the main scanning direction. FIG. FIG. 26 is a diagram illustrating a change with time in the conveyance speed of the paper 6 and the rotation speed of the additional folding roller 410 when the additional folding processing unit 4 according to the present embodiment is executing the additional folding process. 24 to 26, an example in which additional folding processing is performed on the paper 6 on which the Z-fold having the first fold 6a and the second fold 6b is formed will be described. In addition, the operation of each operation unit described below is performed under the control of the main control unit 101 and the engine control unit 102.

  As shown in FIGS. 24A and 26, the additional folding processing unit 4 according to the present embodiment starts conveying the paper 6 in the additional folding processing unit 4 as shown in FIGS. 24B and 26. In addition, after the timing until the additional folding roller 410 contacts the first fold 6a formed on the paper 6 is calculated, the rotation of the additional folding roller 410 is started without waiting for the paper 6 to stop. As described above, the additional folding processing unit 4 according to the present embodiment starts the rotation of the additional folding roller 410 without waiting for the stop of the paper 6 because the additional folding roller 410 starts rotating and hits the paper 6. This is to shorten the time lag until contact. Thereby, the additional folding processing unit 4 according to the present embodiment can improve the productivity.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 have the folding information regarding the folding method in the folding processing unit 3, the sheet information regarding the size of the sheet 6, the conveyance speed of the sheet 6, and the additional folding roller 410. By controlling the respective parts based on the rotational speed of the sheet, the timing until the additional folding roller 410 comes into contact with the first crease 6a formed on the paper 6 is calculated. Alternatively, at this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 make the respective units based on the conveyance speed of the paper 6, the rotational speed of the additional folding roller 410, and sensor information input from the sensor 430. By controlling, the timing until the additional folding roller 410 comes into contact with the first crease 6a formed on the paper 6 is calculated.

  Then, as shown in FIGS. 24C and 26, the additional folding processing unit 4 starts the contact of the additional folding roller 410 with the first fold 6 a formed on the sheet 6, so that the first fold Pressing on 6a is started. When the additional folding processing unit 4 conveys the sheet 6 until the first fold 6a is located immediately below the additional folding roller rotation shaft 411, as shown in FIGS. By continuing to rotate the additional folding roller 410 after stopping completely, the pressing to the first crease 6a formed on the paper 6 is continued.

  Thereafter, the additional folding processing unit 4 calculates the timing until the additional folding roller 410 is separated from the sheet 6 as shown in FIGS. 24E and 26, and does not wait for the additional folding roller 410 to stop. Then, the conveyance of the paper 6 is started. As described above, the additional folding processing unit 4 according to this embodiment starts transporting the paper 6 without waiting for the additional folding roller 410 to stop. The reason is that the additional folding roller 410 completely stops after the paper 6 is separated. This is in order to shorten the time lag until completion. Thereby, the additional folding processing unit 4 according to the present embodiment can improve the productivity.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 control each part based on the rotational speed of the additional folding roller 410 until the additional folding roller 410 is separated from the sheet 6. Timing is calculated.

  Note that, as shown in FIGS. 24E and 26, the conveyance can be started while pressing the paper 6 in the same direction as the rotation direction in synchronization with the rotation of the additional folding roller 410. This is only when the paper 6 is transported by a transport belt (not shown) that moves to. This is because when the additional folding roller 410 presses the paper 6, the paper 6 is pressed against the paper support plate 420, so that it must pass through a conveyor belt that moves in the same direction as the rotational direction of the additional folding roller 410. This is because the paper 6 may be torn or the like due to friction with the paper support plate 420.

  Then, when the additional folding processing unit 4 conveys the paper 6 separated from the additional folding roller 410 as shown in FIGS. 24 (f) and 26, the additional folding processing unit 4 is further folded as shown in FIGS. 25 (a) and 26. After calculating the timing until the roller 410 contacts the second crease 6b formed on the paper 6, the reversing of the additional folding roller 410 is started without waiting for the paper 6 to stop. In this way, the additional folding processing unit 4 according to the present embodiment starts the reversal of the additional folding roller 410 without waiting for the sheet 6 to stop, as in the case of FIG. This is to shorten the time lag from the start of rotation to the contact with the paper 6. Thereby, the additional folding processing unit 4 according to the present embodiment can improve the productivity.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 have the folding information regarding the folding method in the folding processing unit 3, the sheet information regarding the size of the sheet 6, the conveyance speed of the sheet 6, and the additional folding roller 410. By controlling each part based on the rotational speed of the first and second rotations, the timing until the additional folding roller 410 contacts the second crease 6b formed on the paper 6 is calculated. Alternatively, at this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 make the respective units based on the conveyance speed of the paper 6, the rotational speed of the additional folding roller 410, and sensor information input from the sensor 430. By controlling, the timing until the additional folding roller 410 comes into contact with the second fold 6b formed on the paper 6 is calculated.

  Then, as shown in FIGS. 25B and 26, the additional folding processing unit 4 starts the contact of the additional folding roller 410 with the second fold 6 b formed on the paper 6, so that the second fold Start pressing against 6b. When the additional folding processing unit 4 conveys the sheet 6 until the second fold line 6b is positioned immediately below the additional folding roller rotating shaft 411, as shown in FIGS. 25C and 26, the additional folding processing unit 4 conveys the sheet 6. By continuing to rotate the additional folding roller 410 after stopping completely, the pressing to the second crease 6b formed on the paper 6 is continued.

  Thereafter, the additional folding processing unit 4 calculates the timing until the additional folding roller 410 is separated from the paper 6 as shown in FIGS. 25D and 26, and does not wait for the additional folding roller 410 to stop. Then, the conveyance of the paper 6 is started. In this way, the additional folding processing unit 4 according to the present embodiment starts transporting the paper 6 without waiting for the additional folding roller 410 to stop, as in the case of FIG. This is to shorten the time lag from when the paper 6 is separated until it completely stops. Thereby, the additional folding processing unit 4 according to the present embodiment can improve the productivity.

  At this time, in the additional folding processing unit 4, the main control unit 101 and the engine control unit 102 control each part based on the rotational speed of the additional folding roller 410 until the additional folding roller 410 is separated from the sheet 6. Timing is calculated.

  Note that, as shown in FIGS. 25D and 26, the conveyance can be started while pressing the sheet 6 in synchronization with the rotation of the additional folding roller 410 as in the case of FIG. Thus, this is only when the paper 6 is transported by a transport belt (not shown) that moves in the same direction as the rotation direction. This is because when the additional folding roller 410 presses the paper 6, the paper 6 is pressed against the paper support plate 420, so that it must pass through a conveyor belt that moves in the same direction as the rotational direction of the additional folding roller 410. This is because the paper 6 may be torn or the like due to friction with the paper support plate 420.

  Then, as shown in FIGS. 25E and 26, the additional folding processing unit 4 completes the additional folding process by conveying the sheet 6 separated from the additional folding roller 410. As described above, the additional folding processing unit 4 according to the present embodiment can start additional folding even during the conveyance of the paper, and can convey the paper even before the additional folding is completed. It becomes possible to start. Therefore, the additional folding processing unit 4 according to the present embodiment can further improve productivity.

  Next, another method for suppressing the collision sound between the additional folding roller 410 and the paper support plate 420 will be described with reference to FIGS. 27 to 31 are diagrams for explaining a method for suppressing the collision sound between the additional folding roller 410 and the paper support plate 420 in the additional folding processing unit 4 according to the present embodiment. The operation of each operation unit described below is performed under the control of the main control unit 101 and the engine control unit 102.

  First, as a first method for suppressing the collision noise between the additional folding roller 410 and the paper support plate 420, as shown in FIG. 27A, additional folding at the moment when the additional folding roller 410 contacts the paper 6 is performed. The rotation speed of the roller 410 is V1, and as shown in FIG. 27B, the rotation speed of the additional folding roller 410 when the additional folding roller 410 is pressing the paper 6 is V2, and FIG. As shown in the figure, when the rotational speed of the additional folding roller 410 is V3 when the additional folding roller 410 is not in contact with the paper 6 or when the paper 6 is not pressed, the additional folding processing unit 4 according to the present embodiment is V1. In this method, the rotational speed of the additional folding roller 410 is changed in accordance with the situation so that <V2 and V1 <V3. Note that the additional folding processing unit 4 according to the present embodiment determines what state the additional folding roller 410 is in based on the rotation angle of the additional folding roller rotating shaft 411.

  As described above, the additional folding processing unit 4 according to the present embodiment increases the rotational speed of the additional folding roller 410 at the moment when the additional folding roller 410 abuts on the paper 6 and increases when the additional folding roller 410 is in other situations. By making it lower than the rotation speed of the folding roller 410, it is possible to suppress the collision noise between the additional folding roller 410 and the paper support plate 420.

  Further, the additional folding processing unit 4 according to the present embodiment changes the rotational speed of the additional folding roller 410 according to the situation such as V1 <V3 <V2, thereby improving productivity, suppressing collision noise, It becomes possible to simultaneously realize the three of the additional folding effects.

  That is, the additional folding processing unit 4 according to the present embodiment rotates the additional folding roller 410 at the moment when the additional folding roller 410 contacts the paper 6 in order to suppress the collision sound between the additional folding roller 410 and the paper support plate 420. The speed V1 is controlled to be the smallest. On the other hand, in order to improve productivity, the additional folding processing unit 4 according to the present embodiment rotates the additional folding roller 410 at the moment when the additional folding roller 410 abuts against the paper 6 or is not pressing the paper 6. The speed V3 is controlled to become the largest.

  Further, the additional folding processing unit 4 according to the present embodiment rotates the additional folding roller 410 when the additional folding roller 410 presses the paper 6 in order to firmly press the crease so that productivity does not decrease. The speed V2 is controlled to be a magnitude between V1 and V3. As described above, the additional folding processing unit 4 according to the present embodiment changes the rotational speed of the additional folding roller 410 according to the situation such that V1 <V3 <V2, thereby improving productivity and reducing the impact sound. It is possible to simultaneously realize the three effects of suppression and additional folding.

  Next, as a second method for suppressing the collision noise between the additional folding roller 410 and the paper support plate 420, as shown in FIG. 28 (a), the additional folding roller 410 is applied to the paper 6 having a thickness of less than X mm. The rotational speed of the additional folding roller 410 at the moment of contact is V4, and as shown in FIG. 28B, the rotational speed of the additional folding roller 410 at the moment of contact of the additional folding roller 410 with the sheet 6 having a thickness of X mm or more is set. When V5 is set, the additional folding processing unit 4 according to this embodiment is configured to press the rotational speed of the additional folding roller 410 at the moment when the additional folding roller 410 contacts the paper 6 so that V4 <V5. It is the method of controlling to change according to the thickness of the. Note that the additional folding processing unit 4 according to the present embodiment acquires paper information on the thickness of the paper 6 by a user operation on the display panel 180 or by a sensor (not shown) for measuring the thickness of the paper 6. It is supposed to be.

  As described above, the additional folding processing unit 4 according to the present embodiment changes the rotation speed of the additional folding roller 410 at the moment when the additional folding roller 410 contacts the paper 6 according to the thickness of the paper 6 to be pressed. Thus, it is possible to suppress the collision sound between the additional folding roller 410 and the paper support plate 420.

  That is, in the additional folding processing unit 4 according to the present embodiment, the rotational speed of the additional folding roller 410 at the moment when the additional folding roller 410 abuts on the paper 6 is smaller when pressing thin paper than thick paper. By controlling, it is possible to suppress the collision sound between the additional folding roller 410 and the paper support plate 420. This is because thick paper has a greater buffering effect than thin paper.

  Next, as a third method for suppressing the collision noise between the additional folding roller 410 and the paper support plate 420, the additional folding roller 410 abuts against the folded paper 6 as shown in FIG. When the rotational speed of the incremental folding roller 410 is V6, and the rotational speed of the incremental folding roller 410 at the moment when the incremental folding roller 410 contacts the tri-folded paper 6 is V7 as shown in FIG. In the additional folding processing unit 4 according to the present embodiment, the rotational speed of the additional folding roller 410 at the moment when the additional folding roller 410 abuts on the paper 6 is determined so that V6 <V7. It is the method of controlling to change according to. Note that the additional folding processing unit 4 according to the present embodiment acquires folding information regarding the number of folding of the paper 6 from the folding processing unit 3.

  As described above, the additional folding processing unit 4 according to the present embodiment changes the rotational speed of the additional folding roller 410 at the moment when the additional folding roller 410 contacts the paper 6 according to the number of times the paper 6 to be pressed is folded. Thus, it is possible to suppress the collision sound between the additional folding roller 410 and the paper support plate 420.

  In other words, the additional folding processing unit 4 according to the present embodiment uses the rotational speed of the additional folding roller 410 at the moment when the additional folding roller 410 abuts on the paper 6 as a sheet with a smaller number of folding times than a sheet with a larger number of folding times. By controlling so that the pressing is smaller, the collision sound between the additional folding roller 410 and the paper support plate 420 can be suppressed. This is because, as the number of folding times increases, the overlapping of the sheets increases and the thickness thereof increases, so that the buffering action is greater than that of the number of folding times.

  It should be noted that the rotational speed control as described in FIGS. 27 to 29 may be configured to be performed in combination with each other, or may be configured to perform only a part thereof. good. Further, the setting as to whether or not to control the rotation speed as described in FIGS. 27 to 29 and the setting as to which control can be performed can be appropriately set by the user by operating the display panel 180. It may be configured as follows. That is, in the present embodiment, the display panel 180 functions as a rotation speed setting unit. With such a configuration, the user can freely make a setting that suits his / her preference in consideration of the balance between productivity, suppression of collision noise, and additional folding effect.

  Next, as a fourth method for suppressing the collision noise between the additional folding roller 410 and the paper support plate 420, as shown in FIG. 30, an impact buffer is provided at a position where the additional folding roller 410 of the paper support plate 420 collides. In this method, a material 421 is provided. Thus, by providing the impact buffering material 421 at the position where the additional folding roller 410 of the paper support plate 420 collides, the impact buffering material 421 reduces the impact between the additional folding roller 410 and the paper support plate 420, and Since the collision sound at that time is absorbed, the collision sound can be suppressed. The impact buffer material 421 is made of a buffer material such as rubber, sponge, or plastic resin, for example.

  Next, as a fifth method for suppressing the collision noise between the additional folding roller 410 and the paper support plate 420, an impact buffer sheet 422 is provided between the paper 6 and the additional folding roller 410 as shown in FIG. This is a method of providing a structure. In this way, by providing the impact buffering sheet 422 between the paper 6 and the additional folding roller 410, the impact buffering sheet 422 reduces the impact between the additional folding roller 410 and the paper support plate 420, and at that time It is possible to suppress the above-mentioned collision sound. Further, by providing the impact buffering sheet 422 between the paper 6 and the additional folding roller 410 in this way, the additional folding roller 410 does not contact the paper 6 directly by contacting only the impact buffering sheet 422. Therefore, an effect of preventing folding wrinkles, pressing marks, and the like can be obtained. The impact cushioning sheet 422 is made of a cushioning material such as rubber, sponge, or plastic resin, similarly to the impact cushioning material 421. That is, in the present embodiment, the shock absorbing material 421 and the shock absorbing sheet 422 function as the shock absorbing material.

  As another method for suppressing the collision noise between the additional folding roller 410 and the paper support plate 420, the pressing roller 412c and the pressing bar 412d are, for example, similar to the shock absorbing material 421 and the shock absorbing sheet 422. Further, it may be made of a cushioning material such as rubber, sponge, or plastic resin.

  Next, the load on the additional folding roller rotating shaft 411 when the additional folding processing unit 4 according to the present embodiment is performing the additional folding processing will be described with reference to FIG. FIG. 32 is a graph showing a load on the additional folding roller rotation shaft 411 when the additional folding processing unit 4 according to the present embodiment is performing the additional folding processing operation. In FIG. 32, the total load on the additional folding roller rotating shaft 411 in the configuration of the additional folding roller 410 shown in FIGS. 17 to 19 is shown by a solid line graph.

  Further, the broken line graph in FIG. 32 indicates the additional folding when it is assumed that each set of the pressing force transmitting portions 412 constituting the additional folding roller 410 shown in FIGS. 17 to 19 presses the sheet 6 alone. It is a graph which shows the load to the roller rotating shaft 411, and from the left toward FIG. 32, the first set, the second set, the third set, etc. in the additional folding roller 410 shown in FIGS. , 15 is a graph of the 15th set of pressing force transmission part 412.

  In the additional folding roller 410 shown in FIGS. 17 to 19, the first set of pressing force transmission parts 412 is different from the second to fifteenth sets including two pressing force transmission parts 412. Only one pressing force transmission part 412 is included. Therefore, assuming that the first set of pressing force transmission parts 412 is pressing the paper 6 alone, the load on the additional folding roller rotating shaft 411 is the same as that of the other set of pressing force transmission parts 412. It is half of the assumption that 6 is pressed.

  32 is a graph showing the load on the rotating shaft of the additional folding roller when the conventional additional folding processing unit is performing the additional folding processing operation.

  As shown by a broken line in FIG. 32, one set when assuming that each set of pressing force transmitting portions 412 constituting the additional folding roller 410 shown in FIGS. 17 to 19 presses the sheet 6 independently. The load on the additional folding roller rotating shaft 411 is smaller than the load on the rotating shaft of the additional folding roller in the conventional additional folding processing unit.

  Further, as indicated by broken lines in FIG. 32, the total load on the additional folding roller rotating shaft 411 in the configuration of the additional folding roller 410 shown in FIGS. 17 to 19 is also the same as that of the additional folding roller in the conventional additional folding processing unit. It is smaller than the rotation axis. As shown in FIGS. 11 to 13, 14 to 16, and 17 to 19, each set of pressing force transmission units 412 constituting the additional folding roller 410 according to the present embodiment is This is because the paper 6 is sequentially pressed in the main scanning direction at different timings.

  Therefore, the additional folding processing unit 4 according to the present embodiment can obtain the same or more additional folding effect with a smaller pressing force than the additional folding roller in the conventional additional folding processing unit. The load on the folding roller rotation shaft 411 can be reduced. That is, the additional folding processing unit 4 according to the present embodiment can apply a sufficient pressing force to the fold while reducing the load on the additional folding roller rotating shaft 411.

  Next, load torque applied to the additional folding roller drive motor 471 when the additional folding processing unit 4 according to the present embodiment is performing the additional folding processing will be described with reference to FIG. FIG. 33 is a diagram for explaining the rotational moment applied to the additional folding roller rotating shaft 411 when the additional folding processing unit 4 according to this embodiment is performing the additional folding processing operation.

  As shown in FIG. 33, when the additional folding processing unit 4 according to the present embodiment is in the additional folding processing operation, the elastic body after the pressing roller 412c of the pressing force transmitting portion 412 starts to contact the paper 6 A rotational moment is generated in a direction opposite to the rotational direction of the additional folding roller 410 until the expansion / contraction direction of 412b becomes parallel to the perpendicular line extending from the additional folding roller rotation shaft 411 to the paper support plate 420. On the other hand, as shown in FIG. 33, when the additional folding processing unit 4 according to the present embodiment is in the additional folding processing operation, the pressing force transmitting portion 412 is not moved until the expansion / contraction direction of the elastic body 412b is parallel to the perpendicular. Until the pressing roller 412c separates the paper 6, a rotational moment is generated in the same direction as the rotational direction of the additional folding roller 410.

  Accordingly, when it is assumed that each set of the pressing force transmission units 412 constituting the additional folding roller 410 according to the present embodiment is pressing the sheet 6 independently, these rotational moments are increased and applied to the folding roller driving motor 471. It becomes load torque.

  However, the additional folding roller 410 according to this embodiment is configured as shown in FIGS. 11 to 13, 14 to 16, and FIGS. 17 to 19. The rotational moment generated by the pressing force transmission unit 412 and the rotational moment generated by the other set of pressing force transmission units 412 are generated in opposite directions, so that the rotational moments cancel each other and the total rotational moment is reduced. Therefore, the image forming apparatus 1 according to the present embodiment can reduce the load torque applied to the additional folding roller drive motor 471 when the additional folding process is being performed. Therefore, the additional folding processing unit 4 according to the present embodiment can apply a sufficient pressing force to the fold while reducing the load on the additional folding roller rotating shaft 411.

  In particular, as shown in FIG. 33, the angle formed by the elastic body 412b constituting the certain set of pressing force transmitting portions 412 and the perpendicular line is α, and the other set of pressing force transmitting portions 412 is configured. When the angle formed by the expansion / contraction direction of the elastic body 412b and the perpendicular is β, when α and β are the same, the rotational moment generated by the pressing force transmission unit 412 of the certain set, and the other The rotational moments generated by the pair of pressing force transmission parts 412 completely cancel each other, and the sum is zero.

  On the other hand, the canceling force is a force in the rotational direction about the additional folding roller rotating shaft 411, and the sheet support plate is caused by the downward force from the additional folding roller rotating shaft 411, that is, the elastic force of the elastic body 412b. The pressing force to 420 is not affected. Therefore, the additional folding processing unit 4 according to the present embodiment can apply a sufficient pressing force to the fold while reducing the load on the additional folding roller rotating shaft 411.

  Here, FIG. 34 shows a change in load torque applied to the additional folding roller drive motor 471 when the additional folding processing unit 4 according to this embodiment is performing the additional folding processing operation. FIG. 34 is a graph showing the load torque applied to the additional folding roller drive motor 471 when the additional folding processing unit 4 according to this embodiment is performing the additional folding processing. In FIG. 34, the total load torque applied to the additional folding roller drive motor 471 when the additional folding roller rotating shaft 411 is rotated in the configuration of the additional folding roller 410 shown in FIGS. Is shown.

  Further, the dotted line graph in FIG. 34 shows the additional folding when it is assumed that each set of the pressing force transmitting portions 412 constituting the additional folding roller 410 shown in FIGS. 17 to 19 presses the sheet 6 alone. It is a graph which shows the load torque to the roller drive motor 471, and from the left toward FIG. 34, the first set, the second set, the third set in the additional folding roller 410 shown in FIGS. -It is a graph about the 15th set of pressing force transmission parts 412.

  Note that the additional folding roller 410 shown in FIGS. 17 to 19 is different from the first set of pressing force transmission portions 412 in that the second set to the fifteenth set include two pressing force transmission portions 412. Only one pressing force transmission part 412 is included. Therefore, assuming that the first set of pressing force transmission units 412 is pressing the sheet 6 alone, the load torque applied to the additional folding roller drive motor 471 is determined by the other set of pressing force transmission units 412 alone. This is half of the assumption that the paper 6 is being pressed.

  As shown in FIG. 34, the absolute value of the load torque applied to the additional folding roller drive motor 471 when the additional folding processing unit 4 according to this embodiment is performing the additional folding processing operation is the rotation of the additional folding roller rotating shaft 411. When the angle is from about 38 ° to about 173 °, it can be seen that each set of pressing force transmission portions 412 is smaller than the case where it is assumed that the pair 6 is pressing the paper 6 alone. This is because, as described above, the rotational moment generated by a certain set of pressing force transmission units 412 and the rotational moment generated by another set of pressing force transmission units 412 cancel each other. Therefore, the additional folding processing unit 4 according to the present embodiment can apply a sufficient pressing force to the fold while reducing the load on the additional folding roller rotating shaft 411.

  However, as shown in FIG. 34, when the rotation angle of the additional folding roller rotating shaft 411 is from about 11 ° to about 38 °, the absolute value of the load torque to the additional folding roller drive motor 471 is the value of the pressing force transmission unit 412. This is larger than when it is assumed that each group presses the sheet 6 independently. This is because all the pressing force transmission parts 412 that are in contact with the paper 6 are the same until the first set of pressing force transmission parts 412 start to contact the paper 6 and rotate by a predetermined angle (around 38 °). This is because a rotational moment is generated in the direction of.

  Therefore, as shown in FIG. 35, the elastic force of the elastic body 412b of the second set of pressing force transmission parts 412 is reduced, or the number of the second set of pressing force transmission parts 412 is reduced. It is also possible to reduce the load torque to the additional folding roller drive motor 471 in the rotation angle range (near 11 ° to 38 °). Here, FIG. 35 is a graph showing the load torque applied to the additional folding roller drive motor 471 when the additional folding processing unit 4 according to the present embodiment is performing the additional folding processing operation. However, in such a configuration, since the pressing force by the second set of pressing force transmission units 412 is smaller than the pressing force by the other set of pressing force transmission units 412, For the corresponding portion, the additional folding effect is low.

  Further, as shown in FIG. 34, when the rotation angle of the additional folding roller rotating shaft 411 is from about 173 ° to about 189 °, the absolute value of the load torque to the additional folding roller drive motor 471 is determined by the pressing force transmission unit 412. This is larger than when it is assumed that each group presses the sheet 6 independently. This is because the additional folding roller shown in FIGS. 17 to 19 includes only 15 sets of pressing force transmission parts 412, and the 13th and subsequent sets of pressing force transmission parts 412 are the previous pressing forces. This is because the number of sets of pressing force transmission parts 412 for canceling the rotational moments from each other is reduced compared to the set of transmission parts 412.

  Therefore, as shown in FIG. 36, the elastic force of the elastic body 412b of the 15th set of pressing force transmission parts 412 is reduced, or the number of the 15th set of pressing force transmission parts 412 is reduced. It is also possible to reduce the load torque applied to the additional folding roller drive motor 471 in the rotation angle range (near 173 ° to about 189 °). In addition, as shown in FIG. 37, by reducing the elastic force of the elastic body 412b of the 14th set and 15th set of pressing force transmission portions 412, or the 14th set and the 15th set. By reducing the number of the parts 412, it is possible to reduce the load torque to the additional folding roller drive motor 471 in the rotation angle range (near 173 ° to 189 °).

  Here, FIG. 36 and FIG. 37 are graphs showing the load torque to the additional folding roller drive motor 471 when the additional folding processing unit 4 according to the present embodiment is performing the additional folding processing operation. However, in such a configuration, the pressing force of the pressing force transmission unit 412 of the 15th set, or the 14th set and the 15th set, is smaller than the pressing force of the other set of pressing force transmission units 412. The portion corresponding to the pressing force transmitting portion 412 of the 15th set, or the 14th set and the 15th set, has a low additional folding effect.

  When it is assumed that the first set includes two pressing force transmission parts 412, a graph as shown in FIG. 38 is obtained. Here, FIG. 38 is a graph showing the load torque applied to the additional folding roller drive motor 471 when the additional folding processing unit 4 according to this embodiment is performing the additional folding processing operation.

  Next, the structure of the additional folding roller driving device 470 according to the present embodiment will be described with reference to FIGS. 39 and 40. FIG. 39 is a view of the additional folding roller driving device 470 according to the present embodiment as viewed from the main scanning direction. FIG. 40 is a perspective view of the additional folding roller driving device 470 according to the present embodiment.

  As shown in FIGS. 39 and 40, the additional folding roller driving device 470 according to this embodiment is provided at one end of the additional folding roller 410 in the main scanning direction, and includes an additional folding roller driving motor 471, a timing belt 472, and a reverse gear. 473, an additional folding roller rotation gear pulley 474, and an additional folding roller rotation pulley 475.

  The additional folding roller drive motor 471 is a motor that rotates the reverse gear 473. The additional folding roller rotation gear pulley 474 is a pulley having a gear that meshes with the reverse gear 473, and rotates in a direction opposite to the rotation direction of the reverse gear 473 when the reverse gear 473 rotates. The timing belt 472 is an endless belt for increasing the rotation of the additional folding roller rotation gear pulley 474 and transmitting it to the folding roller rotation pulley 475. The additional folding roller rotation pulley 475 is connected to the additional folding roller rotation shaft 411, and is rotated in the same direction as the additional folding roller rotation gear pulley 474 by the timing belt 472 by the rotation of the additional folding roller rotation gear pulley 474. The additional folding roller rotating shaft 411 is rotated in the rotating direction.

  When the additional folding roller driving device 470 configured as described above rotates the additional folding roller 410 in the direction of the arrow shown in FIG. 40, first, the additional folding roller driving motor 471 is controlled according to the control of the engine control unit 102 as shown in FIG. By rotating in the direction opposite to the arrow shown in FIG. 40, the reverse gear 473 is rotated in the direction opposite to the arrow direction shown in FIG. As a result, the additional folding roller rotating gear pulley 474 rotates in the same direction as the arrow shown in FIG. 40, and the rotation is transmitted to the additional folding roller rotating pulley 475 via the timing belt 472.

  When the additional folding roller rotation pulley 475 rotates, the additional folding roller rotation shaft 411 rotates in conjunction with the rotation, whereby the additional folding roller 410 rotates in the direction of the arrow shown in FIG. When the additional folding roller driving device 470 rotates the additional folding roller 410 in the direction opposite to the arrow shown in FIG. 40, each rotates in the opposite direction.

  As described above, the additional folding processing unit 4 according to the present embodiment is shown in FIGS. 8 to 10, FIGS. 11 to 13, FIGS. 14 to 16, and FIGS. By rotating the additional folding roller 410 configured as described above and using the additional folding roller rotation shaft 411 as a rotation shaft, the folds formed on the sheet can be sequentially pressed in the main scanning direction by the respective pressing force transmission portions 412. It can be done.

  Therefore, the additional folding processing unit 4 according to the present embodiment can apply the pressing force of each pressing force transmitting portion 412 in a concentrated manner over the entire fold in a short time. Therefore, the additional folding processing unit 4 according to the present embodiment can apply a sufficient pressing force to the fold without reducing the productivity while reducing the load on the additional folding roller rotating shaft 411. . As a result, it is possible to provide an additional folding device that is highly productive, small, and low in cost.

  In the present embodiment, an example in which the additional folding processing unit 4 rotates the additional folding roller 410 only once in one direction and presses a single fold once from a specific direction. However, by rotating the additional folding roller 410 a plurality of times only in one direction, the additional folding roller 410 may be configured to be pressed a plurality of times from a specific direction with respect to one fold, or the additional folding roller 410 may be rotated in both directions. Thus, the fold line may be configured to be pressed a plurality of times from both the paper conveyance direction and the opposite direction. With this configuration, the additional folding processing unit 4 according to this embodiment can obtain a larger additional folding effect.

  Further, the additional folding roller 410 according to the present embodiment has not only the structures shown in FIGS. 8 to 10, FIGS. 11 to 13, FIGS. 14 to 16, and FIGS. 17 to 19, but also a plurality of pressing forces. Each of the transmission units 412 has a timing different from that of at least one of the other pressing force transmission units 412 according to the positional relationship with the paper support plate 420 that changes as the additional folding roller rotation shaft 411 rotates. The same effect can be obtained if the elastic body 412b is configured to be arranged around the additional folding roller rotating shaft 411 in the main scanning direction so as to expand and contract by receiving stress from 420.

  In the present embodiment, the configuration in which the image forming unit 2, the folding processing unit 3, the additional folding processing unit 4, and the scanner unit 5 are provided in the image forming apparatus 1 has been described. These devices may be connected to constitute an image forming system.

Embodiment 2. FIG.
In the first embodiment, as described with reference to FIGS. 39 and 40, the additional folding roller 410 can rotate in both the clockwise and counterclockwise directions with the additional folding roller rotation shaft 411 as the rotation axis. Explained. In this case, as described with reference to FIGS. 21 to 23, the additional folding processing unit 4 can press the fold formed on the sheet from both directions in the sub-scanning direction.

  On the other hand, in the present embodiment, a configuration will be described in which the additional folding roller 410 can rotate only clockwise or counterclockwise about the additional folding roller rotation shaft 411 as a rotation axis. In this case, the additional folding processing unit 4 can only press the fold formed on the sheet from one direction in the sub-scanning direction, but the additional folding roller 410 may be rotated in a direction opposite to the rotatable direction. Therefore, the driving force of the additional folding roller drive motor 471 can be used for another drive system. Details will be described below. In addition, about the structure which attaches | subjects the code | symbol similar to Embodiment 1, it shall show the same or an equivalent part, and abbreviate | omits detailed description.

  First, the structure of the additional folding roller driving device 470 according to the present embodiment will be described with reference to FIGS. 41 and 42. FIG. 41 is a view of the additional folding roller driving device 470 according to the present embodiment as viewed from the main scanning direction. FIG. 42 is a perspective view of the additional folding roller driving device 470 according to the present embodiment.

  As shown in FIGS. 41 and 42, the additional folding roller driving device 470 according to the present embodiment has a one-way clutch 476, a reverse rotation gear 477, a one-way clutch 478, a reverse, in addition to the structure shown in FIGS. A rotating cam 479 is provided.

  The one-way clutch 476 is provided inside the additional folding roller rotation pulley 475, and only when the additional folding roller rotation pulley 475 rotates in a specific direction, the additional folding roller rotation shaft 411 rotates in the same direction to increase the folding. When the roller rotation pulley 475 rotates in a direction opposite to the specific direction, the roller rotation pulley 475 is idled so that the additional folding roller rotation shaft 411 is not rotated. That is, in the present embodiment, the one-way clutch 476 functions as a driving force blocking unit.

  The one-way clutch 476 according to the present embodiment rotates the additional folding roller rotation shaft 411 in the same direction only when the additional folding roller rotation pulley 475 rotates in the direction of arrow A shown in FIG. It is assumed that the pulley 475 is configured to idle when it rotates in the direction opposite to the direction of the arrow A shown in FIG.

  The reverse rotation gear 477 is a gear that meshes with the reverse gear 473, and rotates in the direction opposite to the rotation direction of the reverse gear 473 by rotating the reverse gear 473, that is, in the same direction as the additional folding roller rotary gear pulley 474. . The one-way clutch 478 is provided inside the reverse rotation gear 477. Similar to the one-way clutch 476, the one-way clutch 478 rotates the reverse rotation cam 479 in the same direction only when the reverse rotation gear 477 rotates in a specific direction. When 477 rotates in a direction opposite to the specific direction, the reverse rotation cam 479 is not rotated and the reverse rotation cam 479 is not rotated.

  The one-way clutch 478 according to this embodiment rotates the reverse rotation cam 479 in the same direction only when the reverse rotation gear 477 rotates in the direction of arrow B shown in FIG. It shall be comprised so that it may idle when it rotates in the direction opposite to the direction of the arrow B shown.

  Since the one-way clutch 476 and the one-way clutch 478 are configured as described above, only one of the additional folding roller rotating pulley 475 and the reverse rotating cam 479 rotates even when the additional folding roller driving motor 471 rotates. It will be. Further, the rotational directions of the additional folding roller rotating pulley 475 and the reverse rotating cam 479 are opposite to each other.

  The reverse rotation cam 479 has a curved surface in which the distance from the rotation axis of the reverse rotation gear 477 is not constant, and the rotational movement of the reverse rotation cam 479 is increased in a portion where the distance from the rotation axis of the reverse rotation gear 477 is long. It is connected to a reverse rotation drive transmission unit 480 for transmitting to a drive system other than the folding roller 410.

  When the additional folding roller driving device 470 configured as described above rotates the additional folding roller 410 in the direction of the arrow A shown in FIG. 42, the additional folding roller driving motor 471 is first illustrated in accordance with the control of the engine control unit 102. 42, the reversing gear 473 is rotated in the direction opposite to the direction of the arrow A shown in FIG. Thereby, the additional folding roller rotating gear pulley 474 rotates in the same direction as the arrow A shown in FIG. 42, and the rotation is transmitted to the additional folding roller rotating pulley 475 via the timing belt 472.

  When the additional folding roller rotating pulley 475 rotates, the additional folding roller rotating shaft 411 rotates in conjunction with the rotation, whereby the additional folding roller 410 rotates in the direction shown in FIG. At this time, the reverse rotation gear 477 does not rotate due to the function of the one-way clutch 478.

  On the other hand, in order to use the driving force of the additional folding roller driving motor 471 for another driving system by the additional folding roller driving device 470 configured as described above, first, the additional folding roller driving motor 471 is controlled according to the control of the engine control unit 102. Is rotated in the direction opposite to the arrow B shown in FIG. 42, thereby rotating the reverse rotation gear 477 in the direction opposite to the direction of the arrow B shown in FIG.

  Thereby, the reverse rotation cam 479 rotates in the same direction as the arrow B shown in FIG. 42, and transmits the rotational motion to a drive system other than the additional folding roller 410 via the reverse rotation drive transmission unit 480. At this time, the additional folding roller rotation pulley 475 does not rotate due to the function of the one-way clutch 476. That is, in this embodiment, the reverse rotation drive transmission unit 480 functions as another drive transmission unit.

  With such a configuration, the additional folding processing unit 4 according to the present embodiment uses the driving force of the additional folding roller drive motor 471 to rotate the additional folding roller 410 in the direction opposite to the rotatable direction. It can be used for other drive systems.

  When the additional folding roller driving device 470 is configured as described above, the additional folding processing unit 4 first stops the rotation of the additional folding roller drive motor 471 when attempting to stop the rotation of the additional folding roller 410. However, due to the function of the one-way clutch 476, the additional folding roller 410 continues to rotate in the same direction for a while due to the rotational moment due to its own inertial force. This is because even if the rotation of the additional folding roller drive motor 471 stops, the function of the one-way clutch 476 cannot cancel the rotational moment due to the inertial force from the direction opposite to the rotational direction of the additional folding roller 410. .

  Therefore, even if the additional folding processing unit 4 according to the present embodiment intends to rotate the additional folding roller 410 by the predetermined angle θ and stop at the rotation angle θ, the additional folding roller 410 actually has the predetermined angle θ. Since the rotation is stopped by more than θ, the accurate rotation angle of the additional folding roller 410 is lost.

  Therefore, when the additional folding roller driving device 470 is configured as described above, a stopping device for rotating the additional folding roller 410 by the predetermined angle θ and accurately stopping at the rotation angle θ is required. Therefore, the additional folding processing unit 4 according to the present embodiment includes a stopping device 490 for stopping the additional folding roller 410 at a predetermined position. That is, in the present embodiment, the stop device 490 functions as a rotation stop unit.

  Here, the structure of the stopping device 490 according to the present embodiment will be described with reference to FIGS. 43 to 45. FIG. 43 is a perspective view of the stopping device 490 according to the present embodiment. FIG. 44 is a transparent view of the stopping device 490 according to the present embodiment as viewed from a direction perpendicular to a plane formed in the main scanning direction and the sub-scanning direction. FIG. 45 is a view of the stopping device 490 according to the present embodiment as viewed from the main scanning direction.

  As shown in FIGS. 43 to 45, the stop device 490 according to the present embodiment is provided on the opposite side of the additional folding roller driving device 470 with respect to the main scanning direction of the additional folding roller 410, and the stop device fixing portion 491. , A rotation part 492, a rotation screw 493, a connection part 494, a rotation stop part 495, a torsion spring 496, a sensor 497, a sensor shielding part 498, and a rotation stop action part 499.

  The stop device fixing portion 491 is a fixing portion for fixing the stop device 490 to the additional folding processing unit 4. The rotating portion 492 is fixed to the stop device fixing portion 491 by the rotating screw 493 so that the rotating portion 492 can rotate in the direction of the arrow C shown in FIGS. The rotation screw 493 fixes the rotation unit 492 to the stop device fixing unit 491 so that the rotation unit 492 can rotate in the direction of arrow C shown in FIGS. 43 and 45 so that the rotation screw 493 itself becomes the rotation axis of the rotation unit 492. The connecting part 494 connects the rotating part 492 and the rotation stopping part 495. The rotation stopping unit 495 is connected to the rotating unit 492 by the connecting unit 494, and thus rotates in the direction of the arrow D shown in FIGS. 43 and 45 with the rotating screw 493 as the rotation axis.

  The torsion spring 496 is a torsion spring attached around the portion where the rotating portion 492 is attached to the stopping device fixing portion 491 by the rotating screw 493, one of which is fixed to the stopping device fixing portion 491 and the other is the rotation stopping portion. It is fixed to 495. By adopting such a configuration, the torsion spring 496 exerts a force to prevent rotation of the rotation stop portion 495 with the rotation screw 493 as a rotation axis by its own elastic force, and the rotation stop portion 495 is moved back to its original position. It becomes possible to return to the position. Note that the elastic force of the torsion spring 496 according to this embodiment is larger than the inertial force of the additional folding roller 410.

  The sensor 497 includes an infrared irradiation unit that emits infrared rays and an infrared light reception unit that receives the infrared rays. When the infrared rays emitted from the infrared irradiation unit toward the infrared light reception unit are shielded by the sensor shielding unit 498, This is notified to the engine control unit 102. The sensor shielding unit 498 is fixed to the additional folding roller rotating shaft 411 and rotates together with the additional folding roller 410. When the additional folding roller 410 rotates by a predetermined angle θ, irradiation from the infrared irradiation unit to the infrared light receiving unit in the sensor 497 is performed. Shielding the infrared rays. By adopting such a configuration, the additional folding processing unit 4 according to the present embodiment has the additional folding roller 410 rotated by a predetermined angle θ by the sensor shielding unit 498 shielding the sensor 497 as described above. This can be detected, and control for stopping the additional folding roller 410 at that time, that is, control for stopping the rotation of the additional folding roller drive motor 471 can be performed.

  The rotation stopping action part 499 is provided at the tip of the sensor shielding part 498 and is configured to come into contact with the rotation stopping part 495 when the additional folding roller 410 rotates by the predetermined angle θ.

  The additional folding processing unit 4 according to the present embodiment is provided with the stop device 490 configured as described above, so that the additional folding roller 410 is rotated by the predetermined angle θ to stop at the rotation angle θ. When the rotation of the folding roller drive motor 471 is stopped, the rotational moment due to the inertial force of the additional folding roller 410 can be canceled from the opposite direction.

  Therefore, the additional folding processing unit 4 according to the present embodiment is arranged such that the additional folding roller 410 is moved to the predetermined angle θ even when the additional folding roller driving device 470 is configured as shown in FIGS. It is possible to prevent the folding roller 410 from continuing to rotate in the same direction for a while even when the rotation of the additional folding roller drive motor 471 is stopped when the rotation is stopped at the rotation angle θ. Become.

  That is, even if the additional folding processing unit 4 according to the present embodiment intends to rotate the additional folding roller 410 by the predetermined angle θ and stop at the rotation angle θ, the additional folding roller 410 actually has the predetermined folding roller 410. There is no such thing as stopping after rotating beyond the angle θ. Accordingly, the additional folding processing unit 4 according to the present embodiment causes the additional folding roller 410 to move to the predetermined angle even when the additional folding roller driving device 470 is configured as shown in FIGS. 41 and 42. The rotation angle θ can be rotated and the rotation angle θ can be accurately stopped, so that the accurate rotation angle of the additional folding roller 410 can always be grasped.

Embodiment 3 FIG.
As shown in FIGS. 8 to 10, FIGS. 11 to 13, FIGS. 14 to 16, and FIGS. 17 to 19, the additional folding roller 410 according to the first embodiment includes a plurality of pressing force transmission units 412. The additional folding roller rotation shaft 411 is arranged around the additional folding roller rotation shaft 411 at a constant interval in the main scanning direction with a certain angular difference in the rotation direction.

  For this reason, the additional folding roller 410 according to the first embodiment is rotated about the additional folding roller rotation shaft 411 as a rotation shaft, so that the folds formed on the sheet are sequentially moved in the main scanning direction by the respective pressing force transmission units 412. It can be pressed.

  Therefore, the additional folding roller 410 according to the first embodiment can concentrate the pressing force of each pressing force transmitting portion 412 over the entire fold in a short time. Therefore, the additional folding roller 410 according to the first embodiment can apply a sufficient pressing force to the fold line without reducing the productivity while reducing the load on the additional folding roller rotating shaft 411. . As a result, it is possible to provide an additional folding device that is highly productive, small, and low in cost.

  On the other hand, the additional folding roller 410 according to the present embodiment has a convex pressing force transmission unit 412 on the surface of the pressing force transmission roller 413 that is a cylindrical rotating body having the additional folding roller rotation shaft 411 as a rotation axis. The additional folding roller rotation shaft 411 and the additional folding roller rotation shaft 411 are arranged in a spiral shape with a constant angle difference θ.

  Therefore, the additional folding roller 410 according to this embodiment can sequentially press the folds formed on the paper 6 in one direction in the main scanning direction by rotating about the additional folding roller rotation shaft 411 as a rotation shaft. It can be done.

  Therefore, the additional folding roller 410 according to the present embodiment has a simple configuration and can apply the pressing force of the pressing force transmitting portion 412 intensively over the entire crease in a short time as in the first embodiment. It becomes. Therefore, the additional folding roller 410 according to the present embodiment can apply a sufficient pressing force to the fold line without reducing productivity while reducing the load on the additional folding roller rotating shaft 411 with a simple configuration. It becomes possible. Accordingly, it is possible to provide an additional folding device having a simple configuration, high productivity, small size, and low cost.

  Details will be described below. In addition, about the structure which attaches | subjects the code | symbol similar to Embodiment 1, it shall show the same or an equivalent part, and abbreviate | omits detailed description.

  First, a first structural example of the additional folding roller 410 according to this embodiment will be described with reference to FIGS. 46 to 49, respectively. FIG. 46 is a perspective view showing the additional folding roller 410 according to the present embodiment from an obliquely upper side in the main scanning direction. FIG. 47 is a front view showing the additional folding roller 410 according to this embodiment from the sub-scanning direction. FIG. 48 is a side view showing the additional folding roller 410 according to this embodiment from the main scanning direction. FIG. 49 is a development view of the additional folding roller 410 according to the present embodiment.

  As shown in FIGS. 46 to 49, the additional folding roller 410 according to this embodiment includes a convex pressing force transmission portion 412 on the surface of the pressing force transmission roller 413, as shown in FIGS. The rotating shaft 411 is arranged with a certain angle difference θ. As a result, the pressing force transmission unit 412 is configured to be spirally disposed along the additional folding roller rotation shaft 411.

  Here, the pressing force transmission roller 413 is a columnar rotating body having an additional folding roller rotating shaft 411 rotating around an axis penetrating in the main scanning direction. The additional folding roller 410 according to the present embodiment is configured in this manner, so that only a part of the pressing force transmission unit 412 comes into contact with the fold formed on the sheet 6.

  Therefore, the additional folding roller 410 according to this embodiment can sequentially press the folds formed on the paper 6 in one direction in the main scanning direction by rotating about the additional folding roller rotation shaft 411 as a rotation shaft. it can.

  Therefore, the additional folding processing unit 4 according to the present embodiment can apply a concentrated pressing force over the entire crease in a short time. Therefore, the image forming apparatus according to the present embodiment can apply a sufficient pressing force to the crease without reducing productivity while reducing the load on the additional folding roller rotating shaft 411 with a simple configuration. It becomes. As a result, the additional folding processing unit 4 according to the present embodiment can provide an additional folding apparatus with a simple configuration, high productivity, small size, and low cost.

  Next, a second structural example of the additional folding roller 410 according to this embodiment will be described with reference to FIGS. 50 to 53. FIG. 50 is a perspective view showing the additional folding roller 410 according to the present embodiment from an obliquely upper side in the main scanning direction. FIG. 51 is a front view showing the additional folding roller 410 according to this embodiment from the sub-scanning direction. FIG. 52 is a side view showing the additional folding roller 410 according to this embodiment from the main scanning direction. FIG. 53 is a development view of the additional folding roller 410 according to the present embodiment.

  As shown in FIGS. 50 to 53, the additional folding roller 410 according to the present embodiment has a convex pressing force transmission portion 412 that is further folded on the circumferential surface of the pressing force transmission roller 413 as shown in FIGS. The roller rotation shaft 411 is arranged with a certain angle difference θ, and is arranged in a V shape so as to be symmetrical with respect to the center of the additional folding roller 410 in the main scanning direction. The additional folding roller 410 according to the present embodiment is configured in this way, so that a part of the pressing force transmitting portion 412 is in contact with the fold formed on the paper 6 at two places simultaneously.

  Therefore, the additional folding roller 410 according to the present embodiment can sequentially press the folds formed on the paper 6 in both directions of the main scanning direction by rotating about the additional folding roller rotation shaft 411 as the rotation shaft. .

  Therefore, the additional folding processing unit 4 according to the present embodiment has a pressing force that is lower than that of the structure shown in FIGS. 50 to 53, but has a simple configuration and a concentrated pressing force in a shorter time. Can be applied over the entire crease. Therefore, the image forming apparatus according to the present embodiment can apply sufficient pressing force to the fold while reducing the load on the additional folding roller rotating shaft 411 while improving productivity with a simple configuration. Become. As a result, the additional folding processing unit 4 according to the present embodiment can provide an additional folding apparatus with a simple configuration, higher productivity, smaller size, and lower cost.

  Next, a structural example of the paper support plate 420 according to the present embodiment will be described with reference to FIG. FIG. 54 is a side view showing the paper support plate 420 according to this embodiment from the main scanning direction.

  As shown in FIG. 54, the paper support plate 420 according to the present embodiment expands and contracts in the direction in which the pressing force by the additional folding roller 410 acts between the fixing member 424 fixed in the additional folding processing unit 4. An elastic body 423 is attached and configured. That is, in the present embodiment, the elastic body 423 functions as a pressing portion. 54 shows an example in which the elastic body 423 is configured by a compression spring, other than this, the elastic body 423 may be configured by a material having elasticity such as a leaf spring, rubber, sponge, or a plastic resin. .

  Then, as shown in FIG. 54, the paper support plate 420 according to the present embodiment increases when the elastic body 423 is compressed by being pressed by the pressing force transmission unit 412 via the paper 6 during additional folding. It moves in the direction in which the pressing force by the folding roller 410 acts. The additional folding roller 410 according to the present embodiment presses the crease formed on the paper 6 by the elastic force of the elastic body 423 at this time.

  As described above, the additional folding roller 410 according to the present embodiment has the convex pressing force transmission unit 412 on the surface of the cylindrical pressing force transmission roller 413 having the additional folding roller rotation shaft 411 as the rotation axis. Is configured to be arranged in a spiral shape around the additional folding roller rotation shaft 411 with a certain angle difference θ from the additional folding roller rotation shaft 411.

  Therefore, the additional folding roller 410 according to this embodiment can sequentially press the folds formed on the paper 6 in one direction in the main scanning direction by rotating about the additional folding roller rotation shaft 411 as a rotation shaft. It can be done.

  Therefore, the additional folding roller 410 according to the present embodiment can apply the pressing force of the pressing force transmitting portion 412 intensively over the entire fold in a short time with a simple configuration. Therefore, the additional folding roller 410 according to the present embodiment can apply a sufficient pressing force to the fold line without reducing productivity while reducing the load on the additional folding roller rotating shaft 411 with a simple configuration. It becomes possible. Accordingly, it is possible to provide an additional folding device having a simple configuration, high productivity, small size, and low cost.

  In the present embodiment, as described with reference to FIG. 54, the example in which the fold formed in the paper 6 is pressed by the elastic force generated by the compression of the elastic body 423 has been described. In addition, the pressing force transmission part 412 is configured as an elastic body that expands and contracts in the direction in which the pressing force by the additional folding roller 410 acts, and is formed on the paper 6 by the elastic force generated by the compression of the elastic body. You may be comprised so that a crease | fold may be pressed.

  In this embodiment, the additional folding roller 410 configured as shown in FIGS. 46 to 49 and 50 to 53, the elastic body 423 configured as shown in FIG. 54, and the fixing member 424 are provided. The additional folding processing unit 4 provided has been described as an example. In addition, the additional folding roller 410 configured as shown in FIGS. 8 to 10, FIGS. 11 to 13, FIGS. 14 to 16, and 17 to 19, and the elasticity configured as shown in FIG. The additional folding processing unit 4 including the body 423 and the fixing member 424 may be used.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Image forming unit 3 Folding processing unit 4 Additional folding processing unit 5 Scanner unit 6 Paper 6a First fold 6b Second fold 10 CPU
20 RAM
30 ROM
40 HDD
50 I / F
60 LCD
DESCRIPTION OF SYMBOLS 70 Operation part 80 Dedicated device 90 Bus 101 Main control part 102 Engine control part 103 Input / output control part 104 Image processing part 105 Operation display control part 110 Paper feed table 120 Print engine 130 Folding processing engine 140 Incremental folding processing engine 150 Scanner engine 160 ADF
170 Output tray 180 Display panel 190 Network I / F
310 entrance roller pair 320 registration roller pair 330 transport path switching claw 340 first folding processing transport roller pair 350 second folding processing transport roller pair 360 creasing transporting roller pair 370 sensor 410 additional folding roller 411 additional folding roller rotating shaft 412 Pressing force transmission part 412a Fixing part 412b Elastic body 412c Pressing roller 413 Pressing force transmission roller 420 Paper support plate 421 Impact buffering material 422 Impact buffering sheet 423 Elastic body 424 Fixing member 430 Sensor 440 Additional folding processing conveyance roller pair 450 Discharge roller pair 460 Post-processing conveyance roller pair 470 Additional folding roller driving device 471 Additional folding roller driving motor 472 Timing belt 473 Reverse gear 474 Additional folding roller rotating gear pulley 475 Additional folding roller rotating pulley 476 Iclutch 477 Reverse rotation gear 478 One-way clutch 479 Reverse rotation cam 480 Reverse rotation drive transmission unit 490 Stop device 491 Stop device fixing portion 492 Rotation portion 493 Rotation screw 494 Connection portion 495 Rotation stop portion 496 Torsion spring 497 Sensor 498 Sensor shielding portion 499 Rotation Stop action

JP 2007-045331 A JP 2009-149435 A

The present invention, pressing device, an image forming system.

In order to solve the above-described problem, one embodiment of the present invention includes a shaft and a pressing member provided around the shaft, and the pressing member has a pressing position on the medium in the rotation direction. And the pressing member sequentially presses the folds of the medium along the direction of the folds by rotating the shaft while the medium is stopped .

Claims (30)

A pressing portion that presses the sheet while rotating around the rotation axis;
The pressing portion has a pressing member arranged over a predetermined range in the rotation axis direction,
The sheet processing apparatus, wherein the pressing member is arranged so that a position in a rotation direction about the rotation axis is different according to the rotation axis direction.   The sheet processing apparatus according to claim 1, wherein the pressing member presses the sheet over the entire arranged range.   The sheet processing apparatus according to claim 1, wherein the pressing member is disposed so as to be a target with a center of the rotation axis in the rotation axis direction as a reference.   2. The pressing member according to claim 1, wherein a physical shape changes in a pressing direction of the sheet to generate an elastic force corresponding to the change amount, and the pressing member presses the sheet by the generated elastic force. 3. The sheet processing apparatus according to any one of 3 above.   Among the pressing members, at least one of a pressing portion arranged from the top to a predetermined position with respect to the rotation direction, or a pressing portion arranged from a predetermined position to the rearmost with respect to the rotation direction. The sheet processing apparatus according to claim 4, wherein the generated elastic force is smaller than the elastic force generated by the pressing portions disposed at other positions when the amount of change is the same. A sheet support part for supporting the sheet from a direction opposite to the pressing direction;
The sheet processing apparatus according to claim 1, further comprising: an impact cushioning material that cushions an impact when the pressing member presses the sheet at a predetermined position of the sheet support portion. .   The shock absorbing material is provided so as to be positioned between the sheet and the sheet support portion in a state where the sheet is supported at the predetermined position in the sheet support portion. The sheet processing apparatus according to 6.   The shock absorbing material is provided so as to be positioned between the sheet and the pressing member in a state where the sheet is supported at the predetermined position in the sheet supporting portion. Or the sheet processing apparatus of 7. A rotation control unit for controlling the rotation of the pressing unit;
The sheet processing apparatus according to claim 1, wherein the rotation control unit determines a rotation direction of the pressing unit based on folding information regarding a fold formed on the sheet. A rotation control unit for controlling the rotation of the pressing unit;
The sheet processing apparatus according to claim 1, wherein the rotation control unit determines a rotation speed of the pressing unit based on folding information regarding a fold formed on the sheet. A rotation control unit for controlling the rotation of the pressing unit;
When the rotation control unit rotates the pressing unit in a specific rotation direction,
A first rotation speed in the specific rotation direction of the pressing portion in a predetermined period until the pressing member starts pressing the sheet;
A second rotation speed of the pressing portion in the specific rotation direction in a period from when the pressing member starts pressing the sheet until the pressing member finishes pressing the sheet;
as well as,
The rotation of the pressing portion is controlled to be smaller than a third rotation speed of the pressing portion in the specific rotation direction after the pressing member finishes pressing the sheet. The sheet processing apparatus according to claim 1.   The rotation control unit controls the rotation of the pressing unit so that the third rotation speed is larger than the second rotation speed when the pressing unit is rotated in the specific rotation direction. The sheet processing apparatus according to claim 11, wherein the sheet processing apparatus is characterized. A rotation control unit for controlling the rotation of the pressing unit;
The sheet processing apparatus according to claim 1, wherein the rotation control unit determines a rotation speed of the pressing unit based on sheet information about the sheet.   The sheet processing apparatus according to claim 10, further comprising a rotation speed setting unit that sets the rotation speed in accordance with a user operation. A rotation control unit for controlling the rotation of the pressing unit;
The rotation control unit is configured to prevent the sheet from being stopped in accordance with a timing when the pressing member contacts the sheet when the pressed unit presses the stopped sheet after the conveyed sheet is stopped. The sheet processing apparatus according to claim 1, wherein control for rotating the pressing portion is started. A conveyance control unit for controlling conveyance of the sheet;
When the conveyance control unit conveys the pressed sheet after the stopped pressing of the sheet is finished, the pressing member is arranged in accordance with a timing at which the pressing unit finishes pressing the sheet. 16. The sheet processing apparatus according to claim 1, wherein control for conveying the sheet is started before the sheet is separated from the sheet. A driving force for rotating the pressing unit, and a rotational driving braking unit for generating a braking force for stopping the rotation of the pressing unit;
Of the driving force generated by the rotational drive braking unit, only the driving force for rotating the pressing unit in a specific rotation direction is transmitted to the pressing unit, and the pressing unit is the specific rotation direction. A driving force blocking unit that blocks the driving force for rotating in the opposite direction from the pressing unit;
Another drive transmission unit that transmits the driving force blocked from the pressing unit to another drive unit;
The sheet processing apparatus according to claim 1, further comprising: The driving force blocking unit is configured to press only the braking force for stopping the pressing unit from rotating in the direction opposite to the specific rotation direction out of the braking force generated by the rotational driving braking unit. The braking force for transmitting to the part and stopping the pressing part so as not to rotate in the specific rotation direction from the pressing part,
Rotation for stopping the pressing portion so as not to rotate in the specific rotation direction when the rotation driving braking portion is stopped from a state of driving to rotate the pressing portion in the specific rotation direction. The sheet processing apparatus according to claim 17, further comprising a stop unit.   The rotation stopping unit generates a rotational moment generated by an inertial force of the pressing unit when the rotation driving braking unit stops from a state of driving to rotate the pressing unit in the specific rotation direction. The sheet processing apparatus according to claim 18, wherein the pressing unit is stopped so as not to rotate in the specific rotation direction by canceling from the opposite side. A sheet support portion for supporting the sheet from a direction opposite to the pressing direction;
A pressing portion that presses the sheet support portion against the pressing member;
The sheet processing apparatus according to claim 1, further comprising:   21. The sheet processing apparatus according to claim 1, wherein the pressing member is continuously arranged over a predetermined range in the rotation axis direction. The pressing portion includes a rotating body that rotates about the rotating shaft,
The sheet processing apparatus according to claim 21, wherein the pressing member is disposed on a surface of the rotating body.   23. The sheet processing apparatus according to claim 1, wherein a plurality of the pressing members are arranged over a predetermined range in the rotation axis direction.   In the pressing portion, a plurality of the pressing members are arranged in a row over a predetermined range in the rotation axis direction, and between the pressing members arranged adjacent to each other in one row, The sheet processing apparatus according to claim 23, wherein the pressing members arranged in other rows are arranged so as to press the sheet.   25. The sheet processing apparatus according to claim 23, wherein the pressing unit includes an odd number of pressing members arranged over a predetermined range in the rotation axis direction.   25. The sheet processing apparatus according to claim 23, wherein the pressing unit includes an even number of pressing members arranged over a predetermined range in the rotation axis direction.   Among the plurality of pressing members arranged, the pressing member arranged from the beginning to a predetermined position with respect to the rotation direction, or the pressing member arranged from the predetermined position to the last with respect to the rotation direction 27. The number of at least one member in the direction of the rotation axis is smaller than the number of pressing members arranged at other positions in the direction of the rotation axis, respectively. The sheet processing apparatus according to item 1.   28. The sheet processing apparatus according to claim 23, wherein a plurality of the pressing members are rotated about a rotation axis parallel to the rotation axis. An image forming apparatus for performing image forming output on the sheet;
A folding processing device that forms a crease in the sheet by performing a folding process on the sheet on which an image is formed by the image forming device;
The sheet processing apparatus according to any one of claims 1 to 28, wherein the fold formed by the folding processing apparatus is pressed.
An image forming system comprising: A sheet processing method in a sheet processing apparatus including a pressing unit that presses a sheet while rotating around a rotation axis,
The pressing portion has a pressing member arranged over a predetermined range in the rotation axis direction,
The pressing member is disposed such that a position in a rotation direction around the rotation axis differs according to the rotation axis direction,
The sheet processing method according to claim 1, wherein the pressing unit rotates about the rotation axis to press the sheet along the rotation axis at a timing according to a position where the pressing member is disposed.