JP6677440B2 - Post-processing device - Google Patents

Description

  The present invention relates to a post-processing device 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 is formed by a post-processing device, the top and bottom of the sheet may be cut in order to adjust the size of the sheet. In the field of shredders for cutting paper, a cutting mechanism other than conveyance is rotated at a high speed to enable more reliable cutting (for example, see Patent Document 1).
However, in order to use the cut paper as a printed material, the post-processing apparatus is provided with a paper transport unit that transports the paper and a cutting waste transport unit that transports the cut cutting waste, and the speed of each transport unit is provided. Are transported in the same manner. Also, the cutting waste generated in the top portion and the ground portion is configured to transmit power to the top portion and the ground portion via a common drive motor or the like, and to be transported at the same transport speed.

International Publication No. WO2006 / 001370

However, when the paper is cut by the cutting unit, if the transport speed of the main body paper and the transport speed of the cutting waste do not have an appropriate relationship with each other, a problem such as generation of fluff may occur. Specifically, if the transport speed of the cutting waste is too slower than the transport speed of the sheet, the cutting waste may bend, and the cutting waste may occur. If the paper transport speed is too high than the cutting waste transport speed, the pulling may cause fluffing.
Furthermore, when cutting the top and bottom of the paper, it is necessary to transport the cutting waste at the top and the cutting waste at the ground, respectively.However, if the transport of the cutting waste is the same drive for the left and right, Even if an attempt is made to make adjustments, there is a problem that it is difficult to make compatible adjustments because the driving components and assembly variations between the top and bottom are different from each other.

  The present invention has been made in view of the above circumstances, and when cutting the top part and the ground part of paper, transports cutting waste at an appropriate speed to prevent generation of fluff and curling of paper. It is another object of the present invention to provide a post-processing device capable of performing the following.

That is, among the post-processing devices of the present invention, the first present invention
A paper transport unit configured to transport one or more sheets of paper,
A cutting unit that cuts a top portion and a ground portion of the paper along the transport direction of the paper transported by the paper transport unit,
A cutting waste transporting unit that transports the top cutting waste and the ground cutting waste cut from the paper by the cutting unit,
And a control unit for controlling the cutting waste transport unit,
Wherein the control unit, the conveying speed of the conveying speed of cutting debris conveyance unit set faster than the conveying speed by the sheet conveying unit, and conveys the side and the fabric part cutting debris conveying said top portion cutting scrap side The transport speed for transporting the top cuttings and the transport speed for transporting the ground cuttings are adjusted with independent adjustment values so that the predetermined value is obtained .

The second post-processing apparatus of the present invention is the invention of the embodiment, front SL controller by setting the nip pressure before Symbol cutting debris conveying section larger than the nip pressure of the sheet conveying portion, the cutting waste wherein the conveying speed of the conveying unit is set faster than the conveying speed of the sheet transport unit.

A post-processing device according to a third aspect of the present invention includes : a sheet conveying unit that conveys one or more sheets;
A cutting unit that cuts a top portion and a ground portion of the paper along the transport direction of the paper transported by the paper transport unit,
A cutting waste transporting unit that transports the top cutting waste and the ground cutting waste cut from the paper by the cutting unit,
And a control unit for controlling the cutting waste transport unit,
The control unit is capable of independently controlling the cutting dust transport unit on the side that transports the top cutting waste and the side that transports the ground cutting waste, and has a coefficient of friction of the cutting waste transport unit. Is set lower than the friction coefficient of the paper transport unit, whereby the transport speed of the cutting waste transport unit is set faster than the transport speed of the paper transport unit.

Fourth post-processing apparatus of the present invention, the first or second of the onset Oite bright, the control unit, the adjustment value for the transport speed and the top portion cutting chips in said land portion cutting chips respectively It is characterized by having a storage unit for storing.

According to a fifth aspect of the present invention, in the third aspect of the present invention, in the third aspect of the invention, the control unit independently adjusts a transport speed of the top cutting chips and the ground cutting chips by the cutting chip transport unit. It is possible, and having a storage unit for respectively storing data relating to the adjustment of the conveying speed and front Kiten portion cutting chips in said land portion cutting debris.

  According to a sixth aspect of the present invention, in the post-processing apparatus according to any one of the first to fifth aspects, the control unit may adjust a transport speed of the cutting waste transport unit according to a paper type and a paper thickness of the paper. It is characterized by setting.

  In a post-processing apparatus according to a seventh aspect of the present invention, in any one of the first to sixth aspects of the invention, the control unit may be configured to control a transport speed of the cutting waste transporting unit by changing the top cutting waste and the ground cutting waste. It is characterized in that it is set in accordance with each of the waste cutting widths.

The post-processing device according to an eighth aspect of the present invention is the post-processing apparatus according to any one of the first to seventh aspects, wherein at least one of the nip pressure of the cutting waste transport unit and the nip pressure of the paper transport unit is variable. Features.

According to a ninth aspect of the present invention, in the post-processing apparatus according to any one of the first to eighth aspects, the control unit may be configured to control the nip pressure of the top cutting waste and the ground cutting waste in the cutting waste conveying unit. And the nip pressure can be adjusted independently.

The post-processing device according to a tenth aspect of the present invention is the post-processing device according to any one of the first to ninth aspects, wherein the cutting waste transporting unit transports the top cutting waste and the ground waste cutting. It is characterized by having different driving sources.

An eleventh aspect of the present invention is the post-processing apparatus according to any one of the first to tenth aspects, wherein one of the transport speed adjustment command value for the top cut waste and the transport speed adjustment command value for the ground cut waste is provided. Alternatively, an input unit capable of setting both of them is provided.

  That is, according to the present invention, it is possible to independently control the cutting waste transporting unit on the side that transports the top cutting waste and the side that transports the ground cutting waste, and drive components of the top and the ground. The effect of preventing the generation of fluff and curling of the sheet by properly transporting the cutting debris at the top portion and the ground portion while avoiding the influence of the variation of the paper can be obtained.

FIG. 1 is a diagram illustrating an example of an external configuration of an image forming system according to an embodiment of the present invention. FIG. 14 is a diagram illustrating an example of an external configuration of an image forming system according to another embodiment. FIG. 2 is a diagram illustrating a schematic configuration of the image forming system. FIG. 2 is a block diagram of the image forming system. Similarly, it shows a view from the downstream side of the slit portion. Similarly, it shows a view from the side of the slit portion. It is a perspective view showing the width direction end of a slit part similarly. FIG. 3 is a diagram illustrating a state of a sheet conveyed by a slit unit. 3A and 3B are diagrams illustrating a state of a sheet conveyed by a slit in a conventional example and a state of a sheet conveyed by a slit in the embodiment. FIG. 4 is a block diagram showing a part of the control relationship of the cutting waste transporting unit. 6 is a flowchart illustrating a setting procedure of a cutting waste conveyance speed. 6 is a flowchart illustrating an example of a method of setting a cutting waste conveyance speed. 6 is a flowchart illustrating an example of a method of setting a cutting waste conveyance speed.

Next, an embodiment 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.
The image forming system shown in FIG. 1 includes an image forming apparatus 10 that forms an image and a post-processing apparatus 30 that performs saddle stitching as booklet processing on paper on which an image is formed by the image forming apparatus. It is connected. FIG. 2 shows a modified example in which a reverse conveyance device 20 is interposed between the image forming apparatus 10 and the post-processing apparatus 30, and a large-capacity sheet feeding tray 50 is arranged upstream of the image forming apparatus 10. The image forming system 1 is connected. The post-processing device 30 has a front block 30A and side blocks 30B.

Hereinafter, an outline of a mechanical configuration of the image forming system 1 shown in FIG. 2 will be described 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 sheet feeding tray 50 (not shown in FIG. 3), the image forming apparatus 10, the reversing conveyance device 20, and the post-processing device 30 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 directly or indirectly connected to the image forming apparatus, or may be used in a stand-alone manner.
Further, the image forming apparatus may be configured to have a built-in post-processing device including a cutting unit and a cutting waste conveying unit.

  The image forming apparatus 10 is provided with an automatic document feeder (ADF) 15 which constitutes a part of a document reading unit on an upper side, and a document fed by the automatic document feeder (ADF) 15 is shown in FIG. The scanner can be used to read images. The document can be read on a platen glass (not shown).

  Further, the 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 configured by a touch panel, and allows an operator to operate and display information. The LCD 14 also serves as an operation unit and a display unit. The operation unit may be configured by a mouse, a tablet, or the like, and may be configured separately from the display unit. Further, the LCD 14 may be movable.

A plurality of paper feed trays 12 (two levels in the figure) are arranged below the image forming apparatus 10 so that paper can be fed. The paper can be fed from a large-capacity paper feeding device 50 not shown in FIG.
In the image forming apparatus 10, a transport path 13 that transports a sheet fed from any 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. Have been. The image forming unit 103 includes a photoconductor 11A, a charger, an LD, a developing device, and a transfer unit (not shown) arranged around the photoconductor 11A. The image forming unit 103 further includes a transfer path 13 downstream of the photoconductor 11A. Is provided with a fixing device 16.
On the downstream side of the fixing device 16, the transport path 13 extends and is connected to the transport path 21 of the reverse transport device 20.

  In the image forming section 103, the surface of the photoconductor 11A is uniformly charged by the charger before writing the image, and the semiconductor laser is irradiated onto the photoconductor 11A, the surface of which is uniformly charged by the LD. To form an electrostatic latent image. The developing device develops the electrostatic latent image formed on the photoconductor 11A by the LD with a toner member. By this development process, a toner image is formed on the photoconductor 11A. The transfer unit transfers the toner image on the photoconductor 11A to the sheet conveyed from the sheet feed tray 12. The sheet on which the toner image has been transferred is separated from the photoconductor 11A and transported 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 on which the fixing process has been performed is directly conveyed to the reversing conveyance device 20 by the conveyance path 13 or after being turned upside down, is circulated upstream of the image forming unit 103 and the image is formed on the back side of the turned upside down sheet. By forming an image by the forming unit 103, printing on both sides can be performed.

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

The post-processing device 30 performs predetermined post-processing such as saddle stapling and paper ejection.
In the front block 30A of the post-processing device 30, a reverse / overlap transport path 32 having an alignment function is provided in the middle of the transport path 31, and the reverse / overlap transport path 32 has a creaser 33 for stitching the sheet. doing. On the downstream side, a cutting unit 34 for cutting a sheet and a folding unit 35 for folding a sheet are arranged in this order. In this embodiment, the cutting unit 34 cuts the top and the bottom of the sheet. It should be noted that, depending on the setting, the processing content for cutting either the top portion or the ground portion may be adopted.

  In the post-processing device 30, a side block 30B is provided beside the front block 30A. The side block 30B has a saddle-stitched staple portion (not shown in FIG. 3) and a square hold for squaring. 36, a cutting unit 37 for fore-cutting. In the side block 30B, a booklet stacking unit 321 for arranging the booklet after the post-processing is provided.

Next, a part of the control block of the image forming system 1 will be described with reference to FIG. In the following description, the description of the reversing conveyance device 20 and the large-capacity paper feed tray 50 is 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 print time storage unit 106, the print order determination unit 107 , A document reading unit 108, a first transport unit 109, a second transport unit 110, a cover identification unit 111, and a voice guidance unit 112.

The image forming apparatus control unit 100 that controls the image forming apparatus 10 has a CPU (Central Processing Unit).
The image forming apparatus control section 100 executes various processes by the operation of the CPU based on a program read from a ROM or the like and expanded in a RAM, setting data read from a nonvolatile memory, or the like. Further, the image forming apparatus control unit 100 controls the reversing conveyance 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 cutting 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 multiple job selection setting unit 102C can select and execute a required job from the multiple jobs listed, and displays a job list using the operation unit 102A and the display unit 102B to execute the job. Enables 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 reverse process and a middle process by touch input from a user via the operation unit 102A. Operation information such as the types of various processing functions from sheet supply to sheet discharge such as binding processing and double-sided printing and sheet discharge, sheet size, and the like are 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 receives document image information input by the document 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. ), An image is formed on a sheet based on the image information of the print job input.

  The image forming unit 103 is, for example, an electrophotographic image forming unit. In the image forming unit 103, a charging unit, an exposing unit, a developing unit, a transferring unit, a separating unit, and a cleaning unit (all not shown) are arranged around a drum-shaped photoreceptor 11A. , Charging, exposure and development are performed to form a toner image on the photoreceptor, and the image is transferred to paper to form an image. Image data used for image formation is stored in the 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 is read as appropriate. The print order determining unit 107 determines the print order of jobs, determines the print order of a plurality of jobs as a reserved job, and records the print 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 a document by a CCD (Charge Coupled Device) or the like, and outputs document image information to the image forming apparatus control unit 100. The image forming apparatus control unit 100 stores the job data in the job storage unit 105 and temporarily stores the image data in the image data storage unit 104 during printing to form an image.

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

The second conveyance unit 110 is controlled by the image forming apparatus control unit 100, and conveys the sheet on which one side of the image has been formed by the image forming unit 103 via a reversing mechanism (not shown) at the time of double-sided printing. This is a conveyance path such as a conveyance roller that conveys to the forming unit 103.
The transport path 13 includes a first transport unit 109 and a second transport unit 110.

  The cover identification unit 111 identifies whether the fed paper is a cover, and includes an image printed by the image forming unit 103 (for example, a cover identifier printed on the paper) or image data included in a print job. , A print page serving as a cover of a booklet or the like 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, and includes an operation button on the operation display unit 102, a button for voice guidance provided outside the operation display unit 102, and the like. 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 stitching section 306, a slit section 307, a folding section 310, a saddle stapling staple section 311, a squaring section 312, a booklet cutting section 313, a sub-tray discharge stacking section 315, a booklet discharging section 320, A booklet loading section 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 to be connected to the post-processing device 30 at a subsequent stage. It performs serial communication.

The transport unit 302 includes a transport roller for transporting the paper 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-conveyance unit 303 is a conveyance path unit such as a conveyance roller for conveying a sheet from the post-processing device 30 to another device when another device is connected to the post-stage of the post-processing device 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 which of the transport unit 302, the downstream transport unit 303, and the sub-tray discharge stacking unit 315 to discharge the sheet.

  The stacking / reversing unit 305 includes the 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 an alignment unit that can turn the sheets over and form a sheet bundle.

  The stitching unit 306 includes the creaser 33 that stitches the sheet, and is controlled by the post-processing device control unit 300 to perform a stitching operation on the sheet according to the content of the post-processing.

  The slit unit 307 includes a cutting unit 34 that performs a top and bottom cut of a sheet. The slit unit 307 is controlled by the post-processing device control unit 300 and performs a top and bottom cut on the sheet according to the post-processing content.

The folding unit 310 is included in the folding unit 35, and performs a folding process on a sheet under the control of the post-processing device control unit 300.
The saddle stapling unit 311 performs a stapling process of binding a staple at two places or four places at the center in the width direction and binding a sheet bundle under the control of the post-processing device control unit 300. 30B.

The squaring unit 312 includes a square hold 36 for squaring the spine of the sheet, and is controlled by the post-processing device control unit 300 to flatten the spine fold of the creased sheet bundle. Is applied. The squaring section 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 folded and stapled by the folding unit 310 and the saddle stapling unit 311 to form a booklet. The edge of the sheet bundle is trimmed to align the edge of the sheet. The booklet cutting unit 313 is included in the side block 30B.

The overlapping / reversing unit 305, the stitching unit 306, the slit unit 307, the folding unit 310, the saddle stapling staple unit 311, the squaring unit 312, and the booklet cutting unit 313 constitute a post-processing unit of the present invention. Note that the content of the post-processing unit is not particularly limited in the invention of the present application, and is not particularly limited as long as booklet processing or the like can be performed.
The booklet discharging unit 320 discharges the saddle-stitched sheet to the booklet stacking unit 321.

Next, a detailed configuration of the slit portion 307 will be described with reference to FIGS. FIG. 6 is a view of the slit section 307 viewed from the side in the sheet transport direction. FIG. 5 is a view of the slit portion 307 viewed from the rear side in the paper transport direction, and the paper is transported from the back side to the front side in the figure. FIG. 7 is a view of the cut section 34 as viewed from one end side in the paper width direction.
The transport path 31 has transport rollers 40 and 41, one of which rotates as a drive roller and the other as a driven roller, and transports the paper P at a predetermined speed. The transport path 31, the transport roller 40, and the transport roller 41 constitute a sheet transport unit of the present invention that transports a sheet. The transport speed (linear speed) of the transport rollers 40 and 41 is determined by the image forming apparatus control unit 100, and the command is transmitted to the post-processing apparatus control unit 300, and the transport is controlled 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. 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 controller 300 functions as the controller of the present invention.

As shown in FIG. 5, near the downstream side in the transport direction of the transport rollers 40 and 41, a paper upper pressing roller 41A and a paper lower pressing roller 40A that press the paper from above and below, and lower blades 42 located on both sides in the paper width direction. , 42 and upper blades 43, 43 are arranged on the top side and the ground side, respectively. The lower blades 42, 42 are driven to rotate by a drive rotary shaft 42A, and the upper blades 43, 43 are driven to rotate by a drive rotary shaft 43A, 43A.
The lower blades 42, 42 and the upper blades 43, 43 can change the position in the width direction to change the cutting width (slit width) in the left and right directions in the width direction of the sheet. Note that the lower blades 42, 42 and the upper blades 43, 43 have a height position at which the lower outer edge of the upper blades 43, 43 and the upper outer edge of the lower blades 42, 42 slightly overlap. The upper blades 43 are located outside the lower blades 42, 42, respectively.

  When cutting the paper, the upper blades 43, 43 are pushed 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, when the lower blades 42, 42 and the upper blades 43, 43 rotate in the paper transport direction, the paper sent from the paper transport unit is cut. The upper blades 43, 43, the drive rotary shafts 43A, 43A, the lower blades 42, 42, the drive rotary shafts 42A, 42A, and the pressing member 45 constitute a 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. 9 (A), by making the nip pressure of the cutting waste transport rollers 48 and 49 lower than the transport rollers 40 and 41, a difference is generated between the paper transport force and the slit waste transport force, and the upper blade And the cutting waste PS1, 2 cut by the lower blade can be made hard to apply a force in a direction in which the cutting waste PS1, 2 spreads from the remaining paper P, and the slit fulcrum F is less likely to be fuzzy.
One of the cutting waste PS1 and the cutting waste PS2 is the top and the other is the ground. Which of them is called a top portion or a ground portion can be appropriately set.

  Similarly, as shown in FIG. 9A, by making the frictional force of the cutting waste transporting rollers 48 and 49 lower than that of the transporting rollers 40 and 41, a difference is generated between the paper transporting power and the slit waste transporting power. The paper piece PS cut by the upper blade and the lower blade can be made hard to apply a force in the direction in which the paper piece PS spreads from the remaining paper P, and the slit piece F is less likely to be limp.

  The upper guide 46A and the lower guide 46B are located downstream from the positions of the upper blade 43 and the lower blade 42 in the sheet conveyance direction so as to sandwich the conveyance path 31 from above and below along the sheet conveyance direction. It is growing. The remaining sheet P, from which the cutting waste has been cut by the upper blade 43 and the lower blade 42, moves between the upper guide 46A and the lower guide 46B to the downstream side of the transport path 31 while being transported by the transport rolls 40 and 41. I do.

  On the other hand, the cutting debris 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. The paper is discharged downward by the cutting waste transport rollers 48 and 49. The cutting waste conveying rollers 48, 49 are driven to rotate so as to move the cutting waste PS1, 2 downward. A slit chip storage box or the like (not shown) can be arranged below the cutting chip transport rollers 48 and 49 to store slit chips.

The conveying speed (linear speed) of the top and bottom cutting waste conveying rollers 48 and 49 is 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 conveying speed of the cutting waste may be determined and controlled by the post-processing device control section 300. In this case, the post-processing device controller 300 functions as the controller of the present invention. The cutting waste conveying rollers 48 and 49 correspond to the cutting waste conveying unit of the present invention.
The transport speed (linear speed) of the transport rollers 40 and 41 and the transport speed (linear speed) of the cutting waste transport rollers 48 and 49 are generally set to the same speed.

The cut state of the sheet will be described with reference to the plan view of FIG.
As described above, the sheet P conveyed by the conveying rollers 40 and 41 is cut at the predetermined slit width by the upper blade 43 and the lower blade 42 at the top side and the ground side in the paper width direction along the conveying direction. Is done. In this embodiment, the cutting chips PS1 and PS2 are cut in parallel with the transport direction. Although FIG. 8 and subsequent figures show a state in which cutting is performed only on one side in the width direction, both sides in the paper width direction can be cut, and the cutting waste PS1 and PS2 are formed in contrast. However, the cutting width of the cutting chips PS1 and PS2 may be different. The cutting chips PS1 and PS2 are guided by the upper skew guide 47A and the lower skew guide 47B while the cutting chips PS1 and PS2 are guided by the cutting chips conveyance rollers 48 and 49 so as to be surely conveyed toward the cutting chips storage box. It is transported in the direction of a box. In FIG. 6, the cutting chips PS1, 2 are transported downward, but the present invention is not limited to the direction in which the cutting chips PS1, 2 are transported.

  By the way, if the rigidity on the side of the cutting chips PS1 and 2 is low, when the sheet P is cut, a force E spreading in the direction away from the sheet P is applied to the cutting chips PS1 and 2, and the cut cutting chip PS1 is cut. 2 and 2 are not conveyed in parallel with the portion remaining after the paper P is cut, and are likely to be conveyed obliquely. The cutting chips PS1 and 2 that are obliquely conveyed between the conveying rollers 40 and 41 and the cutting chip conveying rollers 48 and 49 are sandwiched in the oblique direction by the cutting chip conveying rollers 48 and 49, and as a result, are cut. The force is further applied to the slit fulcrum F, and the slit fulcrum F is liable to be fuzzed and to be easily bent. These tend to be continuous with the transport of the paper.

  In the present embodiment, by making the cutting waste conveying speed relatively higher than the paper conveying speed, the warpage of the paper is generated between the cutting waste PS 1 and 2 and the cutting waste conveying rollers 48 and 49 from the speed difference between the two. It is made harder to occur, weakens the force applied to the slit fulcrum, and prevents the generation of fluff and paper bending. When the stiffness is high as in the case of thick paper, fluff is unlikely to occur, so that it is not necessary to forcibly change the conveying force.

FIGS. 9A and 9B are diagrams showing a paper transport state according to the difference between the paper transport speed and the cutting waste transport speed. In these figures, one of the cutting chips PS1 and PS2 is shown as the cutting chips at the top portion and the cutting chips at the ground portion. In this embodiment, the cutting of the sheet at the top portion of the sheet and the cutting portion of the sheet are performed. Is being done.
In FIG. 9A, the transport speed (linear speed) of the transport rollers 40 and 41 is set to 1000 mm / sec, and the transport speed (linear speed) of the cut scrap transport rollers 48 and 49 is set to 1000 mm / sec. Shows a conventional example in which both speeds are set to be the same.
In this embodiment, if the rigidity of the paper is low, the cutting waste PS1, 2 cut by the upper blade and the lower blade is bent and a force is applied in a direction of spreading from the remaining paper P, so that the slit fulcrum F has fluff and paper curl. It will be easier.

  In FIG. 9B, the transport speed (linear speed) of the transport rollers 40 and 41 is set to 1000 mm / sec, and the transport speed (linear speed) of the cut scrap transport rollers 48 and 49 is set to 1020 mm / sec. In this embodiment, the transport speed of the cutting waste transport rollers 48 and 49 is set (increased) higher than the transport speed of the transport rollers 40 and 41. This makes it difficult for the paper to buckle near the slit fulcrum F, thereby preventing the occurrence of fluff and breakage.

  Further, by making the nip pressure 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, and as shown in FIG. It is possible to make it difficult for the sheet PS cut by the upper blade and the lower blade to apply a force in the direction in which it spreads from the remaining sheet P, so that the slit fulcrum F is less likely to be fuzzy.

Similarly, by making the frictional force of the cutting waste transporting rollers 48 and 49 relatively lower than that of the transporting rollers 40 and 41, a difference is created between the paper transporting power and the slit waste transporting power, as shown in FIG. 9B. Further, it is possible to make it difficult for the cutting waste PS cut by the upper blade and the lower blade to apply a force in the direction in which the cutting waste PS spreads from the remaining sheet P, and it is difficult for the slit fulcrum F to be fuzzy or to bend.
The frictional force can be changed by changing at least the surface material between the cutting waste conveying rollers 48 and 49 and the conveying rollers 40 and 41.

The basic transport speed (linear speed) is set for the transport of the paper and the cutting waste, respectively. In contrast, the table size, the waste cutting width, the paper basis weight, the humidity, the temperature, In consideration of the nip pressure and the like, it is possible to set the cutting scrap transport speed to be higher than the paper transport speed.
Table 1 defines the setting conditions when these items are considered. For each item, a coefficient value is set in advance, and the transport speed of the cutting waste is determined according to each item. Can be.
For example, as the cutting waste conveyance speed, each item value is taken out based on Table 1, and <horizontal / longitudinal> × <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 at the time of conveying the cutting waste may be considered.

  In addition, it is necessary to independently control the cutting waste conveyance of the top part and the cutting waste conveyance of the ground part. In this embodiment, the cutting waste conveyance of the top part and the cutting waste conveyance of the ground part are respectively performed. It has different driving sources. Hereinafter, a control block for independently controlling the cutting waste transport unit on the top side and the ground side will be described with reference to FIG.

First, a control unit 150 for controlling the cut waste transporting unit of the post-processing device 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.
The control unit 150 also has an input unit 151 that can input a speed adjustment command value for adjusting the transport speed of the top unit and a speed adjustment command value for adjusting the transport speed of the ground unit. Is controllably connected to As the input unit 151, the operation display unit 102 and the like can be used. Note that the speed adjustment command value may be stored in advance in a storage unit or the like as machine information or the like, and may be read as needed.

The storage unit 153 is controllably connected to the control unit 150. The storage unit 153 can perform nonvolatile storage, and can use a nonvolatile memory, an HDD, or the like. In the control unit 153, operation parameters for transporting the cutting waste, adjustment values for adjusting the transport speed of the cutting waste between the top and the ground, and the like are stored in a readable manner, and the transport speed adjustment value is input. May be written.
In addition, a coefficient value, a table, and the like for determining the cutting waste conveyance in accordance with the paper type and size of the paper, the paper thickness, and the waste cutting width can be stored in a readable manner.

  The control unit 150 is connected to the top cutting and conveying motor 340 via a top cutting drive circuit 341 so as to be controllable, and the control unit is connected to the bottom cutting and conveying motor 350 via the top cutting driving circuit 351 so as to be controllable. I have. Thereby, the control unit 150 can independently control the conveyance of the cutting waste on the top part side and the conveyance of the cutting waste on the ground part side.

  The control unit 150 determines the speed of the cutting waste conveyance in accordance with information 152 such as the paper type, the paper size, the paper thickness, the waste cutting width, and the like, and controls the top cutting circuit 341 and the ground cutting driving circuit 351 to perform the necessary control. A signal is generated, and the top cutting conveyance motor 340 and the bottom cutting conveyance motor 350 are controlled independently. As the conditions such as the paper type, information obtained at the time of image formation can be used, and information 152 input through the input unit 151 can also be used.

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

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

  The control unit determines the nip pressure in the transport of the cutting waste in accordance with the transport speed of the cutting waste determined based on the information 152 and the like. Based on the determined nip pressure, a necessary control signal is generated in the nip pressure drive circuit 361 in accordance with a command from the control unit 150, and the nip pressure drive motor 360 is controlled to a predetermined nip pressure. In order to make the conveying speed of the cutting waste faster than the conveying speed of the main body of paper, the control unit 150 sets the nip pressure of the cutting waste to be higher than the nip pressure of the main body of paper. In controlling the nip pressure, a detection result by the nip pressure driving HP sensor 362 can be used.

  In the above embodiment, the top section cutting section conveyance and the ground section cutting waste conveyance have been described as having different driving sources, but the conveyance speed can be individually adjusted by controlling the respective driving systems. If possible, it is not essential to have each drive source.

  Also, the cutting waste conveyance of the top part and the cutting waste conveyance of the ground part may be controlled so as to have the same conveyance speed.However, depending on circumstances such as a different cutting width, the conveyance speeds may be different from each other. It is also possible to control each conveyance.

Hereinafter, a procedure for setting the cutting waste transport speed will be described with reference to the flowcharts of FIG. 11 and subsequent drawings.
When making the cutting waste conveying speed higher than the paper conveying speed, as shown in FIG. 11, the paper conveying speed is obtained (step s1), and the speed of the cutting waste conveying roller is set according to the obtained paper conveying speed. (Step s2). The following procedure is executed under the control of the image forming apparatus control unit. In the case where the control is performed by the post-processing device, the control may be performed by the control of the post-processing device control unit.

In setting the cutting waste conveyance speed (step s2), the speed may be uniformly increased with respect to the paper conveyance speed.
In FIG. 12, the cutting scrap transport speed is uniformly increased by 2% with respect to the paper transport speed (step s10). At this time, by independently controlling the conveyance of the top portion and the conveyance of the ground portion, a conveyance speed different from an expected value is prevented from being caused due to a variation in both drive systems. Specifically, as shown in Tables 2 and 3, a speed adjustment value is set for the top portion and the ground portion as needed. The speed adjustment value may be changed based on an input value input through the input unit, or the adjustment value may be determined based on a preset value.

In addition to the above, the setting of the cutting waste conveyance speed (step s2) can determine the increase speed in consideration of the rigidity of the sheet and the like as shown in FIG.
The procedure of FIG. 13 calculates the spread amount of the cutting waste from the paper type, thickness, grain, and cutting width of the paper to be cut when setting the paper piece conveying speed, or obtains the amount from the table such as Table 1. To determine the speed-up rate (step s20).

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

REFERENCE SIGNS LIST 1 image forming system 10 image forming apparatus 20 reverse transport apparatus 30 post-processing apparatus 32 reverse / overlap transport path 33 creaser 34 cut unit 35 folding unit 36 square hold 37 cutting unit 40 transport roller 41 transport roller 42 lower blade 43 upper blade 45 pressing Member 46A Upper guide 46B Lower guide 47A Upper skew guide 47B Lower skew guide 48 Cutting waste transport roller 49 Cutting waste transport roller 100 Image forming device control unit 103 Image forming unit 300 Post-processing device control unit 305 Stacking / reversing unit 306 Streaks Attaching section 307 slit section 310 folding section 311 saddle stapling staple section 312 squaring section 313 booklet cutting section 320 booklet discharge section 321 booklet stacking section PS1, 2 cutting waste

Claims (11)

A paper transport unit configured to transport one or more sheets of paper,
A cutting unit that cuts a top portion and a ground portion of the paper along the transport direction of the paper transported by the paper transport unit,
A cutting waste transporting unit that transports the top cutting waste and the ground cutting waste cut from the paper by the cutting unit,
And a control unit for controlling the cutting waste transport unit,
Wherein the control unit, the conveying speed of the conveying speed of cutting debris conveyance unit set faster than the conveying speed by the sheet conveying unit, and conveys the side and the fabric part cutting debris conveying said top portion cutting scrap side A post-processing apparatus , wherein the transport speed for transporting the top-side cutting waste and the transport speed for transporting the ground-side waste cutting are adjusted with independent adjustment values such that a predetermined value is obtained . Prior Symbol controller, by setting the nip pressure before Symbol cutting debris conveying section larger than the nip pressure of the sheet conveying unit, set faster than the conveying speed of the conveying speed of the cutting scrap conveying section the paper transport unit post-processing apparatus according to claim 1, characterized in that. A paper transport unit configured to transport one or more sheets of paper,
A cutting unit that cuts a top portion and a ground portion of the paper along the transport direction of the paper transported by the paper transport unit,
A cutting waste transporting unit that transports the top cutting waste and the ground cutting waste cut from the paper by the cutting unit,
And a control unit for controlling the cutting waste transport unit,
The control unit is capable of independently controlling the cutting dust transport unit on the side that transports the top cutting waste and the side that transports the ground cutting waste, and has a coefficient of friction of the cutting waste transport unit. Is set lower than the friction coefficient of the paper transport unit, so that the transport speed of the cutting waste transport unit is set faster than the transport speed of the paper transport unit. Wherein the control unit, post-processing apparatus according to claim 1 or 2, characterized in that it comprises a storage unit for respectively storing an adjustment value for the transportation speed at said top portion cutting chips and the fabric part cutting debris. Wherein the control unit, the a the top portion Shredded chips from the cutting debris conveying section and a conveying speed of the fabric part cutting scraps can be adjusted independently, transported before Kiten portion cutting chips in said land portion cutting scraps The post-processing device according to claim 3 , further comprising a storage unit that stores data relating to speed adjustment.   The post-processing apparatus according to claim 1, wherein the control unit sets a transport speed of the cutting waste transport 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 part cutting waste and the said ground part cutting waste, The Claim 1 characterized by the above-mentioned. Item 2. The post-processing device according to item 1.   The post-processing apparatus according to claim 1, wherein at least one of a nip pressure of the cutting waste transport unit and a nip pressure of the paper transport unit is variable.   The said control part can adjust independently the nip pressure of the said top part cutting waste, and the nip pressure of the said ground part cutting waste in the said cutting waste conveyance part, The Claim 1 characterized by the above-mentioned. Item 2. The post-processing device according to item 1.   The post-processing according to any one of claims 1 to 9, wherein the cutting waste transporting unit has different driving sources for transport of the top cutting waste and transportation of the ground cutting waste. apparatus.   11. The apparatus according to claim 1, further comprising: an input unit configured to set one or both of a transfer speed adjustment command value of the top cut chips and a transfer speed adjustment command value of the ground cut chips. The post-processing device according to 1.

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