JP2016036750A - Post-processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent trouble such as fuzz or cut bend from occurring in gaps of cutting waste when cutting top and ground parts of a sheet of paper.SOLUTION: The post-processing device has a paper conveyance part that conveys one or more sheets of paper, cut parts that respectively cut the top and the ground of a sheet of paper conveyed by the paper conveyance part along a conveyance direction, a cut waste conveyance part that conveys top cut waste and ground cut waste, and a control part that controls the cut waste conveyance part, where the control part can independently control the cut waste conveyance part on the side of conveying the top cut waste and the side of conveying the ground cut waste and properly conveys top and ground cut wastes by avoiding influences due to dispersion in top and ground drive components to prevent the occurrence of fuzz or paper bend.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a post-processing apparatus including a cutting unit that cuts the top and bottom of a sheet.

When post-processing is performed on a sheet on which an image has been formed by a post-processing apparatus, the top and bottom of the sheet may be cut to adjust the size of the sheet. In the field of shredders that cut sheets, it is possible to cut more reliably by rotating a cutting mechanism other than conveyance at high speed (for example, see Patent Document 1).
However, in the post-processing apparatus, since the cut paper is used as printed matter, a paper transport unit that transports the paper and a cutting waste transport unit that transports the cut cutting waste are provided, respectively. Are transported in the same way. Further, the cutting waste generated at the top and the ground is configured to be transported at the same transport speed by transmitting power to the top and the ground via a common drive motor or the like.

International Publication Number WO2006 / 001370

However, when the sheet is cut by the cutting unit, if the conveyance speed of the main sheet and the conveyance speed of the cutting waste are not in an appropriate relationship with each other, problems such as generation of fuzz may occur. Specifically, when the conveyance speed of the cutting waste becomes lower than the conveyance speed of the paper, the cutting waste may be bent and may be bent. Further, if the paper conveyance speed is too faster than the cutting waste conveyance speed, fluff may occur due to pulling.
In addition, when cutting the top and bottom of the paper, it is necessary to transport the cutting scraps on the top and the cutting scraps on the ground, respectively. Even if the adjustment is attempted, there is a problem that it is difficult to achieve a compatible adjustment because the driving components and assembly variations in the top and bottom are different.

  The present invention has been made against the background of the above circumstances, and when cutting the top and bottom of the paper, the cutting waste is conveyed at an appropriate speed to prevent the generation of fluff and the bending of the paper. One of the objects is to provide a post-processing apparatus capable of performing the above.

That is, among the post-processing apparatuses of the present invention, the first present invention is
A paper transport unit for transporting one or more sheets;
A cutting unit that cuts the top part and the ground part of the sheet along the conveying direction of the sheet conveyed by the sheet conveying unit;
A cutting waste transporting section for transporting the top cutting waste and the ground cutting waste cut from the paper by the cutting portion;
A control unit for controlling the cutting waste conveyance unit,
The said control part can control the said cutting waste conveyance part each independently by the side which conveys the said top part cutting waste, and the side which conveys the said ground part cutting waste.

  In the post-processing apparatus according to the second aspect of the present invention, in the first aspect of the present invention, the control unit controls the conveyance speed of the sheet in the sheet conveyance unit, the top cutting scrap and the ground cutting by the cutting scrap conveyance unit. The waste conveyance speed is set to the same or different speed.

  The post-processing apparatus according to a third aspect of the present invention is characterized in that, in the second aspect of the present invention, the control unit sets a conveyance speed by the cutting waste conveyance unit faster than a conveyance speed by the paper conveyance unit.

  In the post-processing apparatus according to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the control unit transports the top cutting waste and the ground cutting waste by the cutting waste transport unit. And a storage unit that stores data relating to adjustment of the conveyance speed by the control unit.

  In the post-processing apparatus according to a fifth aspect of the present invention, in the fourth aspect of the present invention, the control unit independently adjusts the conveying speeds of the top cutting scraps and the ground cutting scraps by the cutting scrap transporting unit. It is possible, The said memory | storage part each memorize | stores the data regarding adjustment of the conveyance speed in the said top part cutting waste and the said ground part cutting waste.

  The post-processing apparatus according to a sixth aspect of the present invention is the post-processing apparatus according to any one of the first to fifth aspects of the present invention, wherein the control unit determines a conveyance speed by the cutting waste conveyance unit according to a paper type and a paper thickness of the paper. It is characterized by setting.

  The post-processing apparatus according to a seventh aspect of the present invention is the post-processing apparatus according to any one of the first to sixth aspects of the present invention, wherein the control unit determines the conveyance speed of the cutting waste conveyance unit, the top cutting waste and the ground part cutting. It is set according to each scrap cutting width of the scrap.

  The post-processing apparatus according to an eighth aspect of the present invention is characterized in that, in any one of the first to seventh aspects of the present invention, the nip pressure of the cutting waste conveyance unit is set larger than the nip pressure of the paper conveyance unit. And

  In a ninth aspect of the present invention, the post-processing apparatus according to any one of the first to eighth aspects, wherein at least one of the nip pressure of the cutting waste conveyance unit and the nip pressure of the paper conveyance unit is variable. Features.

  A post-processing apparatus according to a tenth aspect of the present invention is the post-processing apparatus according to any one of the first to ninth aspects of the present invention, wherein the control unit is configured such that the nip pressure of the top cutting waste and the ground cutting waste in the cutting waste transporting portion. The nip pressure can be adjusted independently.

  The post-processing apparatus according to an eleventh aspect of the present invention is the postprocessing apparatus according to any one of the first to tenth aspects of the present invention, wherein the cutting scrap conveying section has a friction coefficient lower than that of the sheet conveying section. The conveyance speed of the conveyance unit is set to be faster than the conveyance speed of the paper conveyance unit.

  In the post-processing apparatus of the twelfth aspect of the present invention, in any one of the first to eleventh aspects of the present invention, the cutting waste transporting part is transporting the top part cutting waste and transporting the ground part cutting waste, It is characterized by having different driving sources.

  In any one of the first to twelfth aspects of the present invention, the post-processing apparatus of the thirteenth aspect of the present invention is one of the conveyance speed adjustment command value for the top cutting waste and the conveyance speed adjustment instruction value for the ground cutting waste. Or it has the input part which can set up both.

  That is, according to the present invention, the cutting waste transporting part on the side for transporting the top cutting waste and the side for transporting the ground cutting waste can be controlled independently, and the driving parts for the top and the ground are provided. The effect of preventing the occurrence of fluff and the bending of the paper can be obtained by appropriately conveying the cutting scraps on the top and the ground while avoiding the influence due to the variation of the sheet.

1 is a diagram illustrating an example of an external configuration of an image forming system according to an embodiment of the present invention. It is a figure showing an example of appearance composition of an image forming system in other embodiments similarly. Similarly, it is a figure which shows schematic structure of an image forming system. Similarly, it is a figure which shows the block diagram of an image forming system. Similarly, the figure seen from the downstream of a slit part is shown. Similarly, the figure seen from the side of a slit part is shown. Similarly, it is a perspective view which shows the width direction edge part of a slit part. Similarly, it is a figure which shows the state of the paper conveyed by a slit part. Similarly, the figure which shows the state in the conventional example of the paper conveyed by a slit part, and the figure which shows the state of the paper conveyed by a slit part in embodiment. Similarly, it is a figure which shows the one part block diagram which shows the control relationship of a cutting waste conveyance part. Similarly, it is a flowchart which shows the setting procedure of the cutting waste conveyance speed. Similarly, it is a flowchart which shows an example of the setting method of cutting waste conveyance speed. Similarly, it is a flowchart which shows an example of the setting method of cutting waste conveyance speed.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
Hereinafter, an image forming system including the image forming apparatus 10 and the post-processing apparatus 30 will be described.
In the image forming system illustrated in FIG. 1, an image forming apparatus 10 that performs image formation and a post-processing apparatus 30 that performs saddle stitch binding as a booklet process on a sheet on which an image is formed by the image forming apparatus are mechanically and electrically. It is connected. FIG. 2 shows a modified example in which a reverse conveying device 20 is interposed between the image forming apparatus 10 and the post-processing device 30, and a large-capacity paper feed tray 50 is disposed on the upstream side of the image forming apparatus 10. The image forming system 1 is connected. The post-processing device 30 includes a front block 30A and a side block 30B.

The outline of the mechanical configuration of the image forming system 1 shown in FIG. 2 will be described below with reference to FIG. In FIG. 3, the large-capacity paper feed tray 50 is omitted.
In the image forming system 1, a large-capacity paper feed tray 50, an image forming apparatus 10, a reverse conveying apparatus 20, and a post-processing apparatus 30 that are not shown in FIG. 3 are connected in series.
In the present invention, the connection configuration of the image forming system is not limited to this. Further, the post-processing apparatus of the present invention may be used by being connected to the image forming apparatus directly or indirectly, or may be used stand-alone.
Furthermore, the image forming apparatus may be configured to include a post-processing device including a cutting unit and a cutting waste conveyance unit.

  The image forming apparatus 10 is provided with an automatic document feeder (ADF) 15 constituting a part of a document reading unit on the upper side, and the document fed by the automatic document feeder (ADF) 15 is illustrated. The image can be read by the scanner unit that does not. The document can be read on a platen glass (not shown).

  Further, an LCD 14 is installed at a position where the platen glass is not located on the upper side of the image forming apparatus main body 10A of the image forming apparatus 10. The LCD 14 is composed of a touch panel, and can be operated by an operator and information can be displayed. The LCD 14 serves as both an operation unit and a display unit. The operation unit may be configured with a mouse, a tablet, or the like, and may be configured separately from the display unit. The LCD 14 may be movable.

A plurality of paper feed trays 12 (two stages in the figure) are arranged on the lower side of the image forming apparatus 10 so that paper can be fed. Note that the paper can be fed from a large-capacity paper feeder 50 not shown in FIG.
In the image forming apparatus 10, a transport path 13 for transporting paper fed from one of the paper feed trays 12 is provided, and an image forming unit 103 is provided in the middle of the transport path in the image forming apparatus 10. It has been. The image forming unit 103 includes a photoconductor 11A, a charger, an LD, a developing unit, and a transfer unit (not shown) arranged around the photoconductor 11A. Further, the image forming unit 103 is provided in a conveyance path 13 on the downstream side of the photoconductor 11A. Is provided with a fixing device 16.
On the downstream side of the fixing device 16, the conveyance path 13 extends and is connected to the conveyance path 21 of the reverse conveyance apparatus 20.

  In the image forming unit 103, the surface of the photoconductor 11A is uniformly charged by the charger before the image is written, and the semiconductor photoconductor 11A having the surface uniformly charged by the LD is irradiated with a semiconductor laser, whereby the photoconductor 11A is charged. An electrostatic latent image is formed on the surface. The developing device develops the electrostatic latent image formed on the photoreceptor 11A by the LD with the toner member. By this development processing, a toner image is formed on the photoreceptor 11A. The transfer unit transfers the toner image on the photoconductor 11 </ b> A onto the paper conveyed from the paper feed tray 12. The sheet on which the toner image is transferred is separated from the photoreceptor 11A and conveyed to the fixing device 16. The toner member remaining on the photoconductor 11A is removed by a cleaning unit (not shown).

  The fixing device 16 fixes the toner image transferred to the front side of the sheet as an output image by heating the conveyed sheet. The sheet subjected to the fixing process is conveyed to the reverse conveying device 20 as it is through the conveying path 13 or is reversed on the front and back, and then circulated to the upstream side of the image forming unit 103 and the image on the reverse side of the reversed sheet. By performing image formation with the forming unit 103, printing on both sides can be performed.

  As described above, the reverse conveyance device 20 is provided with the conveyance path 21, and the reverse conveyance path 22 is provided in the middle of the reverse conveyance apparatus 20, so that the paper conveyed on the conveyance path 21 can be reversed and conveyed. When the reverse conveyance of the paper is not performed, the reverse conveyance path 22 can be bypassed and the paper can be conveyed downstream by the conveyance path 21. The conveyance path 21 is connected to the conveyance path 31 of the post-processing device 30 on the downstream side.

The post-processing device 30 performs predetermined post-processing such as saddle stitching and paper discharge.
The front block 30A of the post-processing device 30 has a reversing / overlapping conveying path 32 having an alignment function in the middle of the conveying path 31, and the reversing / overlapping conveying path 32 has a creaser 33 for streaking on the paper. doing. On the downstream side, a cutting unit 34 that cuts a sheet and a folding unit 35 that performs a folding process on the sheet are arranged in this order. In this embodiment, the cutting unit 34 cuts the top and bottom of the paper. In addition, it can also be set as the processing content which cuts one of a top part and a ground part by setting.

  Further, in the post-processing device 30, a side block 30B is provided on the side of the front block 30A, and the side block 30B has a saddle stitching staple unit not shown in FIG. 36. A cutting unit 37 for cutting a small edge is provided. Further, the side block 30B is provided with a booklet stacking unit 321 in which a post-processed booklet is arranged.

Next, a part of the control block of the image forming system 1 will be described with reference to FIG. In the following description, descriptions of the reverse conveyance device 20 and the large-capacity paper feed tray 50 are omitted.
In the image forming apparatus 10, the image forming apparatus control unit 100, the serial communication unit 101, the operation display unit 102, the image forming unit 103, the image data storage unit 104, the JOB storage unit 105, the printing time storage unit 106, and the printing order determination unit 107. A document reading unit 108, a first conveyance unit 109, a second conveyance unit 110, a cover identification unit 111, and a voice guidance unit 112.

An image forming apparatus control unit 100 that controls the image forming apparatus 10 includes a CPU (Central Processing Unit).
The image forming apparatus control unit 100 executes various processes by the operation of the CPU based on a program read from the ROM or the like and expanded in the RAM, or setting data read from the nonvolatile memory. In addition, the image forming apparatus control unit 100 controls the reverse conveying device 20 and the post-processing device 30 in the image forming system 1.
Further, the nonvolatile memory can have setting data for controlling the post-processing device 30 and control data for a cut unit described later.
The serial communication unit 101 is controlled by the image forming apparatus control unit 100 and performs serial communication with the serial communication unit 301 of the post-processing device 30 via the reverse conveyance device 20.

  The operation display unit 102 includes an operation unit 102A, a display unit 102B such as an LCD (Liquid Crystal Display), and a multiple job selection setting unit 102C. In this embodiment, the operation unit 102A and the display unit 102B are configured by the LCD 14. The plurality of job selection setting unit 102C can select and execute a necessary job from a plurality of listed jobs. The operation unit 102A and the display unit 102B display a job list and execute an execution job. Allows operation input to be selected.

  The operation display unit 102 is controlled by the image forming apparatus control unit 100, displays various operation buttons, information related to post-processing, and the like on the display unit 102B, and performs a reversing process and a middle by touch input from the user via the operation unit 102A. Operation information such as the types of various processing functions from paper feeding to paper discharge such as binding processing and double-sided printing and paper size is acquired and output to the image forming apparatus control unit 100.

  The image forming unit 103 is controlled by the image forming apparatus control unit 100, and the original image information input by the original reading unit 108 or an external device (not shown) such as a PC (Personal Computer) connected to the image forming apparatus 10 via a network. The image is formed on the sheet based on the image information of the print job input from (1).

  The image forming unit 103 is, for example, an electrophotographic image forming unit. The image forming unit 103 includes a charging unit, an exposure unit, a developing unit, a transfer unit, a separation unit, and a cleaning unit (all not shown) around the drum-shaped photoconductor 11A. Then, charging, exposure, and development are performed to form a toner image on the photoreceptor, and the image is transferred to a sheet to form an image. Image data used for image formation is stored in an image data storage unit. The printing time is recorded in the printing time storage unit 106.

  The JOB data is stored in the JOB storage unit 105 and appropriately read out. The printing order determination unit 107 determines the printing order of JOBs, can determine the printing order of a plurality of JOBs as a reserved job, and can record the printing order in the JOB storage unit 105 or the like.

  The document reading unit 108 is controlled by the image forming apparatus control unit 100, reads an image of the document with a CCD (Charge Coupled Device) or the like, and outputs document image information to the image forming apparatus control unit 100. In the image forming apparatus control unit 100, job data is stored in the JOB storage unit 105, and image data is temporarily stored in the image data storage unit 104 at the time of printing to form an image.

  The first transport unit 109 is controlled by the image forming apparatus control unit 100 and transports a sheet fed from the paper feed tray 12 via the image forming unit 103 and discharges it to the reverse transport device 20. It is a transport route.

The second transport unit 110 is controlled by the image forming apparatus control unit 100 and transports the paper on which one side is image-formed by the image forming unit 103 via a reversing mechanism (not shown) during double-sided printing. This is a conveyance path such as a conveyance roller for conveyance to the forming unit 103.
The conveyance path 13 includes a first conveyance unit 109 and a second conveyance unit 110.

  The cover identifying unit 111 identifies whether the paper to be fed is a cover, an image printed by the image forming unit 103 (for example, a cover identifier printed on a sheet), image data included in a print job, or the like From this, a print page that becomes a cover such as a booklet is identified. This cover identification can be performed by a known method.

  The voice guidance unit 112 facilitates the operation by performing voice guidance in a predetermined operation. An operation button is provided on the operation display unit 102, or a button for voice guidance is provided outside the operation display unit 102. Can be activated.

Next, the post-processing device 30 will be described.
In the post-processing device 30, a post-processing device control unit 300 that controls the entire post-processing device 30, a serial communication unit 301, a serial communication unit 330, a transport unit 302, a post-stage transport unit 303, a discharge path selection unit 304, a matching function (matching A stacking / reversing unit 305, a stapling unit 306, a slit unit 307, a folding unit 310, a saddle stitching staple unit 311, a cornering unit 312, a booklet cutting unit 313, a sub-tray discharge stacking unit 315, a booklet discharging unit 320, A booklet stacking unit 321 is provided.

  As described above, the serial communication unit 301 performs serial communication with the serial communication unit 101 of the image forming apparatus 10, and the serial communication unit 330 communicates with a device that will be connected to the subsequent stage of the post-processing device 30 in the future. Serial communication is performed.

The conveyance unit 302 includes conveyance rollers that convey the sheet conveyed to the post-processing device 30 from the front block 30A to the side block 30B or the sub-tray discharge stacking unit 315.
The post-stage transport unit 303 is a transport path unit such as a transport roller for transporting paper from the post-process apparatus 30 to another apparatus when another apparatus is connected to the rear stage of the post-process apparatus 30. The transport path 31 is included in the transport unit 302.
The discharge path selection unit 304 is controlled by the post-processing device control unit 300, and selects whether the paper is discharged to the transport unit 302, the post-stage transport unit 303, or the sub-tray discharge stacking unit 315.

  The stacking / reversing unit 305 includes a reversing / stacking conveyance path 32, is controlled by the post-processing device control unit 300, and includes a conveyance path, a conveyance roller, and the like. The stacking / reversing unit 305 has a matching unit that can flip sheets and stack them to form a sheet bundle.

  The scoring unit 306 includes a creaser 33 that stirs the paper. Under the control of the post-processing device control unit 300, the scoring unit 306 performs a scoring operation on the paper according to the content of the post-processing.

  The slit unit 307 includes a cut unit 34 that cuts the paper upside down. Under the control of the post-processing device control unit 300, the slit unit 307 cuts the paper upside down according to the content of the post-processing.

The folding unit 310 is included in the folding unit 35, and performs a folding process on the paper under the control of the post-processing device control unit 300.
The saddle stitching staple unit 311 is controlled by the post-processing device control unit 300, and performs a staple process for binding a bundle of sheets by hitting a binding needle at two or four central distributions in the width direction. 30B.

The squaring unit 312 includes a square hold 36 for squaring the paper back, and receives a control from the post-processing device control unit 300 to flatten the back folding portion of the sheet bundle on which the crease is formed. Apply. The squaring part 312 is included in the side block 30B.
The booklet cutting unit 313 includes a cutting unit 37 having a cutting blade and the like. The booklet cutting unit 313 is controlled by the post-processing device control unit 300 and is subjected to center folding processing and stapling processing by the folding unit 310 and the saddle stitching staple unit 311 to form a booklet. The front edge of the paper bundle is cut to align the front edge of the paper. The booklet cutting unit 313 is included in the side block 30B.

The overlapping / reversing unit 305, the stapling unit 306, the slit unit 307, the folding unit 310, the saddle stitching staple unit 311, the cornering unit 312, and the booklet cutting unit 313 constitute a post-processing unit of the present invention. In the present invention, the content of the post-processing unit is not particularly limited, and is not particularly limited as long as the booklet processing can be performed.
The booklet discharge unit 320 discharges the saddle-stitched paper to the booklet stacking unit 321.

Next, the detailed structure of the slit part 307 is demonstrated based on FIGS. FIG. 6 is a view of the slit portion 307 as viewed from the side in the paper conveyance direction. FIG. 5 is a view of the slit portion 307 as viewed from the rear side in the paper conveyance direction, and the paper is conveyed from the rear side to the front side of the figure. FIG. 7 is a view of the cut portion 34 as viewed from one end side in the paper width direction.
The conveyance path 31 has conveyance rollers 40 and 41, one of which rotates as a driving roller and the other as a driven roller, and conveys the paper P at a predetermined speed. The conveyance path 31, the conveyance roller 40, and the conveyance roller 41 constitute a sheet conveyance unit of the present invention that conveys a sheet. The conveyance speed (linear velocity) by the conveyance rollers 40 and 41 is determined by the image forming apparatus control unit 100, the command is transmitted to the post-processing apparatus control unit 300, and conveyance control is performed by the post-processing apparatus control unit 300. Therefore, in this example, the post-processing device control unit 300 functions as the control unit of the present invention in cooperation with the image forming device control unit 100. Further, the conveyance of the conveyance rollers 40 and 41 may be determined and controlled by the post-processing device control unit 300. In this case, the post-processing device control unit 300 functions as the control unit of the present invention.

Near the downstream side of the transport rollers 40 and 41 in the transport direction, as shown in FIG. 5, a paper upper press roller 41A and a paper lower press roller 40A for pressing the paper from above and below, and a lower blade 42 positioned on both sides in the paper width direction. , 42 and upper blades 43, 43 are disposed on the top side and the ground side, respectively. The lower blades 42 and 42 are rotationally driven by a drive rotary shaft 42A, and the upper blades 43 and 43 are rotationally driven by drive rotary shafts 43A and 43A.
The lower blades 42, 42 and the upper blades 43, 43 can change the cutting width (slit width) on the left and right in the width direction of the paper by changing the position in the width direction. The lower blades 42 and 42 and the upper blades 43 and 43 have a height position where the outer peripheral edge on the lower side of the upper blades 43 and 43 and the outer peripheral edge on the upper side of the lower blades 42 and 42 slightly overlap. The upper blades 43 and 43 are located outside the lower blades 42 and 42, respectively.

  When cutting the paper, the upper blades 43, 43 are pressed inward by the pressing of a pressing member 45 such as a spring coil, and the inner peripheral surfaces of the upper blades 43, 43 substantially contact the outer peripheral surfaces of the lower blades 42, 42. In this state, the lower blades 42 and 42 and the upper blades 43 and 43 rotate in the paper transport direction, whereby the paper fed from the paper transport unit is cut. The upper blades 43 and 43, the drive rotary shafts 43A and 43A, the lower blades 42 and 42, the drive rotary shafts 42A and 42A, and the pressing member 45 constitute the cut portion of the present invention. In the present invention, it is not necessary to have an upper blade and a lower blade as a cutting mechanism.

Further, as shown in FIG. 9A, by making the nip pressure of the cutting scrap conveying rollers 48 and 49 lower than that of the conveying rollers 40 and 41, a difference occurs between the sheet conveying force and the slit dust conveying force, and the upper blade The cutting scraps PS1 and 2 cut by the lower blade can be made difficult to apply a force in the direction in which the remaining paper P spreads from the remaining paper P, and the slit fulcrum F is less likely to be crushed.
One of the cutting waste PS1 and the cutting waste PS2 is cutting top, and the other is cutting waste of the ground. Which is referred to as the top or the ground can be set as appropriate.

  Similarly, as shown in FIG. 9A, by making the frictional forces of the cutting scrap conveying rollers 48 and 49 lower than the conveying rollers 40 and 41, a difference is generated between the sheet conveying force and the slit scrap conveying force, It is possible to make it difficult for the paper piece PS cut by the upper blade and the lower blade to be applied in the direction in which the paper piece PS spreads from the remaining paper P, and the slit segment F is less likely to be crushed.

  An upper guide 46A and a lower guide 46B are directed downstream in the paper transport direction so that the transport path 31 is sandwiched from above and below the positions downstream of the upper blade 43 and the lower blade 42 in the paper transport direction. It is stretched. The remaining paper P from which the cutting waste has been cut by the upper blade 43 and the lower blade 42 is transported by the transport rollers 40 and 41 and moves to the downstream side of the transport path 31 through the upper guide 46A and the lower guide 46B. To do.

  On the other hand, the cutting scraps PS1 and PS2 cut by the upper blade 43 and the lower blade 42 are provided with an upper skew guide 47A and a lower skew guide 47B extending downward from the positions of the upper blade 43 and the lower blade 42 in the downstream direction. And are discharged downward by the cutting waste conveying rollers 48 and 49. The cutting waste transport rollers 48 and 49 are rotationally driven so as to move the cutting wastes PS1 and PS2 downward. A slit waste storage box (not shown) or the like can be disposed below the cutting waste transport rollers 48 and 49 to store the slit waste.

The conveying speeds (linear speeds) of the cutting scrap conveying rollers 48 and 49 in the top and the ground are determined by the image forming apparatus control unit 100, and the command is transmitted to the post-processing apparatus control unit 300, and the post-processing apparatus control unit The conveyance is controlled by 300. Therefore, in this example, the post-processing device control unit 300 functions as the control unit of the present invention in cooperation with the image forming device control unit 100. Further, the post-processing device control unit 300 may determine and control the cutting scrap conveyance speed. In this case, the post-processing device control unit 300 functions as the control unit of the present invention. The cutting waste conveyance rollers 48 and 49 correspond to the cutting waste conveyance unit of the present invention.
The conveying speed (linear speed) of the conveying rollers 40 and 41 and the conveying speed (linear speed) of the cutting waste conveying rollers 48 and 49 are generally set to the same speed.

The cut state of the paper will be described with reference to the plan view of FIG.
As described above, the paper P transported by the transport rollers 40 and 41 is cut along the transport direction between the top side and the ground side in the paper width direction by the upper blade 43 and the lower blade 42 with a predetermined slit width. Is done. In this embodiment, the cutting wastes PS1 and 2 are cut parallel to the transport direction. In FIG. 8 and subsequent figures, the state of cutting only on one side in the width direction is illustrated, but both sides in the sheet width direction can be cut, and the cutting wastes PS1 and PS2 are formed in contrast. However, the cutting widths of the cutting scraps PS1 and PS2 may be different. The cutting waste PS1, 2 is guided by the upper skew guide 47A and the lower skew guide 47B so as to be reliably transported in the direction of the cutting waste storage box, and is stored by the cutting waste transport rollers 48, 49. It is transported in the direction of a box. In addition, in FIG. 6, although cutting waste PS1, 2 is conveyed below, as for this invention, the conveyance direction of cutting waste PS1, 2 is not limited.

  By the way, if the rigidity on the side of the cutting waste PS1, 2 is small, when the paper P is cut, a force E spreading in a direction away from the paper P is applied to the cutting waste PS1, 2, and the cut cutting waste PS1 is cut. 2 is not conveyed in parallel with the portion remaining after the cutting of the paper P, and is easily conveyed obliquely. The cutting waste PS1, 2 conveyed diagonally between the conveying rollers 40, 41 to the cutting waste conveyance rollers 48, 49 is sandwiched in an oblique direction by the cutting waste conveyance rollers 48, 49, and as a result, cut. Further force is applied to the slit fulcrum F, fluff is likely to occur at the slit fulcrum F, and bending is likely to occur. These are easy to continue with the conveyance of the paper.

  In this embodiment, the cutting waste conveyance speed is relatively increased with respect to the paper conveyance speed, so that the paper is not damaged between the cutting wastes PS1 and PS2 and the cutting waste conveyance rollers 48 and 49 from the difference between the two speeds. It is difficult to generate, and the force applied to the slit fulcrum is weakened to prevent the occurrence of fluff and paper bending. When the stiffness is high as in cardboard, fluff is unlikely to occur, so there is no need to forcibly change the conveying force.

FIGS. 9A and 9B are diagrams illustrating a state of paper conveyance according to the difference between the paper conveyance speed and the cutting waste conveyance speed. In these drawings, one of the cutting scraps PS1 and PS2 is shown for the top cutting scrap and the ground cutting scrap. In this embodiment, the paper is cut at the top of the paper and the base of the paper. Has been done.
In FIG. 9A, the conveyance speed (linear speed) of the conveyance rollers 40 and 41 is set to 1000 mm / second, and the conveyance speed (linear speed) of the cutting waste conveyance rollers 48 and 49 is set to 1000 mm / second. This shows a conventional example in which both speeds are set to be the same.
In this embodiment, if the paper has low rigidity, the cutting scraps PS1 and 2 cut by the upper blade and the lower blade are bent and force is applied in the direction of spreading from the remaining paper P, and the slit fulcrum F is bent or bent. It becomes easy.

  In FIG. 9B, the conveyance speed (linear speed) of the conveyance rollers 40 and 41 is set to 1000 mm / second, and the conveyance speed (linear speed) of the cutting waste conveyance rollers 48 and 49 is set to 1020 mm / second. In the embodiment, the conveying speed by the cutting waste conveying rollers 48 and 49 is set (increased) higher than the conveying speed by the conveying rollers 40 and 41. As a result, it is difficult for the paper to sag in the vicinity of the slit fulcrum F, thereby preventing the occurrence of fluff and cutting.

  Further, by making the nip pressure of the cutting waste transport rollers 48 and 49 relatively lower than the transport rollers 40 and 41, a difference is generated between the paper transport force and the slit waste transport force, as shown in FIG. It is possible to make it difficult for the paper piece PS cut by the upper blade and the lower blade to be applied in a direction in which the paper piece PS spreads from the remaining paper P, and the slit fulcrum F is less likely to be crushed.

Similarly, by making the frictional force of the cutting waste transport rollers 48 and 49 relatively lower than that of the transport rollers 40 and 41, a difference is generated between the paper transport force and the slit waste transport force, as shown in FIG. 9B. In addition, it is possible to make it difficult to apply force in the direction in which the cutting waste PS cut by the upper blade and the lower blade spreads from the remaining paper P, and the slit fulcrum F is less likely to be scraped or bent.
The frictional force can be changed by changing the material of at least the surface portion between the cutting waste conveyance rollers 48 and 49 and the conveyance rollers 40 and 41.

The basic conveyance speed (linear speed) is set for each conveyance of the paper and the cutting waste. On the other hand, for each of the horizontal / vertical patterns shown in Table 1, paper size, waste cutting width, paper basis weight, humidity, temperature, The cutting waste conveyance speed can be set to be higher than the paper conveyance speed in consideration of the nip pressure and the like.
Table 1 defines the setting conditions when these items are taken into account. For each item, coefficient values are set in advance, and the cutting waste conveyance speed is determined according to each item. Can do.
For example, as the cutting waste conveyance speed, each item value is taken out based on Table 1, and <width / length> × <paper size> × <dust cutting width> × <basis weight> × <humidity> × <temperature> × It can be calculated by <nip pressure> × basic linear velocity. In Table 1, the coefficient of friction during the cutting waste conveyance may be taken into consideration.

  In addition, it is necessary to control the cutting waste conveyance of the top part and the cutting waste conveyance of the ground part independently. In this embodiment, the cutting waste conveyance of the top part and the cutting waste conveyance of the ground part respectively. Have different drive sources. Below, the control block which controls a cutting waste conveyance part independently by the top part side and a ground part side is demonstrated with reference to FIG.

First, the control part 150 which controls the cutting waste conveyance part of the post-processing apparatus 30 is prepared. The control unit 150 can be configured in cooperation with the image forming apparatus control unit 100 and the post-processing apparatus control unit 300.
Moreover, it has the input part 151 which can input the speed adjustment command value which adjusts the conveyance speed of a top part, and the speed adjustment command value which adjusts the conveyance speed of a ground part, and the input part 151 is the control part 150. Is connected to be controllable. As the input unit 151, the operation display unit 102 or the like can be used. The speed adjustment command value may be stored in advance as machine information or the like in a storage unit that will be described later, and read as necessary.

A storage unit 153 is connected to the control unit 150 in a controllable manner. The storage unit 153 can store data in a nonvolatile manner, and a nonvolatile memory, an HDD, or the like can be used. In the control unit 153, operation parameters for cutting waste conveyance, adjustment values for adjusting the cutting waste conveyance speed between the top and the ground, and the like are readable and stored, and the conveyance speed adjustment value is input. You may make it write the adjustment at the time.
Further, it is possible to readably store a coefficient value, a table, and the like that determine cutting waste conveyance according to the paper type and size of the paper, the paper thickness, and the waste cutting width.

  The control section 150 is connected to the top cutting / conveying motor 340 in a controllable manner via the top cutting drive circuit 341, and is connected to the ground cutting / conveying motor 350 in a controllable manner via the ground cutting driving circuit 351. Yes. Thereby, in the control part 150, it becomes possible to control independently the cutting waste conveyance by the top part, and the cutting waste conveyance by the ground part side.

  The control unit 150 determines the cutting waste conveyance speed according to the information 152 such as the paper type, paper size, paper thickness, and waste cutting width, and controls necessary for the top cutting circuit 341 and the ground cutting drive circuit 351. A signal is produced | generated and the top part cutting conveyance motor 340 and the ground part cutting conveyance motor 350 are controlled independently. For the conditions such as the paper type, information acquired at the time of image formation can be used, and information 152 input through the input unit 151 can also be used.

  Next, Table 2 and Table 3 show examples of speed adjustment command values. By determining the adjustment command value on the top side and the ground side, the speed adjustment is performed so that the transport speed between the top and the ground becomes an expected value in consideration of variations in the drive system. As described above, the speed adjustment command value can be input by the user or the administrator through the input unit 151, and the command value stored in the storage unit 153 can be read and used.

  A nip pressure driving motor 360 is controllably connected to the control unit 150 via a nip pressure driving circuit 361, and a nip pressure driving HP sensor 362 (home position sensor) is connected to the control unit 150. Then, the detection result by the nip pressure driving HP sensor 362 is received by the control unit 150.

  The control unit determines the nip pressure in the cutting waste conveyance according to the cutting waste conveyance speed determined based on the information 152 and the like. For the determined nip pressure, a necessary control signal is generated in the nip pressure driving circuit 361 according to a command from the control unit 150, and the nip pressure driving motor 360 is controlled to be controlled to a predetermined nip pressure. In order to make the cutting waste conveyance speed faster than the conveyance speed of the paper body, the control unit 150 makes the nip pressure in the cutting waste larger than the nip pressure of the paper body. In controlling the nip pressure, the detection result by the nip pressure driving HP sensor 362 can be used.

  In the above description of the embodiment, the top cutting section conveyance and the ground cutting waste conveyance are described as having different driving sources, but the conveyance speed is individually adjusted by controlling each driving system and the like. If possible, it is not essential to have each drive source.

  In addition, the top cutting waste conveyance and the ground cutting waste conveyance may be controlled so as to have the same conveyance speed, but depending on circumstances such as different cutting widths, the conveyance speeds may be different from each other. It is also possible to control each conveyance.

Below, the procedure which sets the cutting waste conveyance speed is demonstrated based on the flowchart after FIG.
When making the cutting waste conveyance speed larger than the paper conveyance speed, as shown in FIG. 11, the paper conveyance speed is acquired (step s1), and the speed of the cutting waste conveyance roller is set according to the acquired paper conveyance speed. (Step s2). The following procedure is executed under the control of the image forming apparatus control unit. Moreover, when controlling by a post-processing apparatus, you may make it perform by control of a post-processing apparatus control part.

When setting the cutting waste conveyance speed (step s2), the cutting waste conveyance speed may be uniformly increased with respect to the paper conveyance speed.
In FIG. 12, the cutting waste conveyance speed is uniformly increased by 2% with respect to the paper conveyance speed (step s10). At this time, the conveyance of the top part and the conveyance of the ground part are controlled independently so that the conveyance speed is not different from the expected value due to the variation of the drive systems of both. Specifically, as shown in Tables 2 and 3, speed adjustment values are set as necessary between the top and the ground. The speed adjustment value may be changed based on the input value input through the input unit, or the adjustment value may be determined based on a preset value.

In addition to this, as for the setting of the cutting waste conveyance speed (step s2), the increase speed can be determined in consideration of the rigidity of the paper as shown in FIG.
The procedure of FIG. 13 calculates the spread amount of cutting waste from the paper type, thickness, paper grain, and cutting width of the paper to be cut, or obtains it from a table such as Table 1 when setting the paper piece conveyance speed. Thus, the speed increase rate is determined (step s20).

  As described above, the present invention has been described based on the above embodiment, but appropriate modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Image forming system 10 Image forming apparatus 20 Reverse conveyance apparatus 30 Post-processing apparatus 32 Inversion and overlap conveyance path 33 Creaser 34 Cut part 35 Folding unit 36 Square hold 37 Cutting unit 40 Conveyance roller 41 Conveyance roller 42 Lower blade 43 Upper blade 45 Press Member 46A Upper guide 46B Lower guide 47A Upper skew guide 47B Lower skew guide 48 Cutting waste conveyance roller 49 Cutting waste conveyance roller 100 Image forming device control unit 103 Image forming unit 300 Post processing device control unit 305 Stacking / reversing unit 306 Attaching part 307 Slit part 310 Folding part 311 Saddle stitching staple part 312 Cornering part 313 Booklet cutting part 320 Booklet discharge part 321 Booklet stacking part PS1, 2 Cutting waste

Claims (13)

A paper transport unit for transporting one or more sheets;
A cutting unit that cuts the top part and the ground part of the sheet along the conveying direction of the sheet conveyed by the sheet conveying unit;
A cutting waste transporting section for transporting the top cutting waste and the ground cutting waste cut from the paper by the cutting portion;
A control unit for controlling the cutting waste conveyance unit,
The said control part can control the said cutting waste conveyance part each independently by the side which conveys the said top cutting waste, and the side which conveys the said ground cutting waste, The post-processing apparatus characterized by the above-mentioned.   The control unit sets the conveyance speed of the paper in the paper conveyance unit and the conveyance speed of the top cutting waste and the ground cutting waste by the cutting waste conveyance unit to the same or different speeds. The post-processing apparatus according to claim 1.   The post-processing apparatus according to claim 2, wherein the control unit sets a conveyance speed by the cutting waste conveyance unit to be faster than a conveyance speed by the paper conveyance unit.   The said control part can adjust the conveyance speed of the said top cutting waste by the said cutting waste conveyance part and the said ground part cutting waste, and is provided with the memory | storage part which memorize | stores the data regarding adjustment of the conveyance speed by the said control part. The post-processing apparatus according to claim 1, wherein the post-processing apparatus is a post-processing apparatus.   The control unit can independently adjust the transport speed of the top cutting waste and the ground cutting waste by the cutting waste transporting unit, and the storage unit is capable of adjusting the top cutting waste and the ground cutting. The post-processing apparatus according to claim 4, wherein data relating to adjustment of the conveyance speed in the waste is stored.   The post-processing apparatus according to claim 1, wherein the control unit sets a conveyance speed by the cutting waste conveyance unit according to a paper type and a paper thickness of the paper.   The said control part sets the conveyance speed by the said cutting waste conveyance part according to each waste cutting width of the said top cutting waste and the said ground cutting waste, The any one of Claims 1-6 characterized by the above-mentioned. The post-processing apparatus according to item 1.   The post-processing apparatus according to any one of claims 1 to 7, wherein a nip pressure of the cutting waste conveyance unit is set to be larger than a nip pressure of the paper conveyance unit.   9. The post-processing apparatus according to claim 1, wherein at least one of a nip pressure of the cutting waste conveyance unit and a nip pressure of the paper conveyance unit is variable.   The said control part can adjust independently the nip pressure of the said top cutting waste, and the nip pressure of the said ground cutting waste in the said cutting waste conveyance part, The any one of Claims 1-9 characterized by the above-mentioned. The post-processing apparatus according to item 1.   The conveyance speed of the cutting waste conveyance unit is set to be higher than the conveyance speed of the paper conveyance unit by making the friction coefficient of the cutting waste conveyance unit lower than the friction coefficient of the paper conveyance unit. The post-processing apparatus of any one of Claims 1-10.   The post-processing according to any one of claims 1 to 11, wherein the cutting waste transporting unit has different driving sources for transporting the top cutting waste and transporting the ground cutting waste. apparatus.   It has an input part which can set up one or both of the conveyance speed adjustment command value of the top part cutting waste, and the conveyance speed adjustment command value of the ground part cutting waste. The after-treatment device described in

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