JP5494376B2 - Sheet processing system, image forming system, and edge cutting position determination method - Google Patents

Description

  The present invention relates to a sheet processing system in which a scoring device, a folding device, and a fore edge cutting device are connected, and more particularly, a sheet processing system characterized by controlling the cutting position of the fore edge cutting in the sheet processing system, and the sheet processing system. The present invention relates to an image forming system provided at the rear stage of the image forming apparatus and a method for determining a cutting edge position in these systems.

  Conventionally, so-called center-folding or center-folding is performed by performing saddle stitching on a sheet bundle in which sheet members such as a plurality of sheets discharged from an image forming apparatus are bundled, and folding the center-bound sheet bundle into two at the center. Folded bookbinding is performed. When a plurality of sheet bundles are folded together in this way, the amount of elongation of the folded portion of the sheet bundle on the outer side of the sheet bundle becomes larger than that of the inner sheet. For this reason, the image portion formed at the folded portion of the outer sheet is stretched, which may cause damage to the image portion such as toner peeling. The same phenomenon occurs in other folding processes such as Z-folding and three-folding. Further, folding may be insufficient depending on the thickness of the sheet bundle.

  Therefore, there is a creasing device called a creaser that prevents the toner from peeling by pre-striking the folded part of the sheet before folding the sheet bundle in two, and making the outer sheet easy to break. Already known. Also known is a small edge bookbinding apparatus that cuts the small edge of a folded sheet bundle and performs good-quality bookbinding.

  By the way, these apparatuses, that is, the image forming apparatus, the creasing apparatus, the folding apparatus, and the fore edge cutting apparatus are generally connected and used as one image forming system. In such an image forming system, before the sheet discharged from the image forming apparatus is folded, a crease portion is previously streaked by a creasing device, and, for example, saddle stitching is performed by the folding device, and then folded in two. Then, the booklet fore edge is cut with a fore edge cutting device to align the sheets in the booklet edge.

  As such an apparatus, for example, an invention described in Patent Document 1 (Japanese Patent No. 4079141) is known. According to the present invention, in order to make the size of the booklet after cutting constant for each sheet size, in the paper post-processing apparatus for post-processing a booklet composed of a folded sheet bundle, the front end of the booklet in the advancing direction contacts A front end stopper arranged at a fixed position and a detecting means for detecting a rear end portion of the booklet stopped in contact with the front end stopper, and transporting the booklet by sandwiching and moving the booklet. A moving unit; a control unit that controls movement of the moving unit; and a cutting device that cuts a fore edge portion of the booklet conveyed to the cutting position by the moving unit, wherein the control unit is a booklet after cutting. In order to make the length from the crease part to the cutting part constant for each paper size, the movement means moves from a predetermined reference position until the trailing edge of the booklet is detected by the detection means, and The transfer The booklet is cut from the position at which the rear end portion of the booklet is detected based on the movement distance determined for each paper size to be moved from the predetermined reference position to the booklet being transported to the cutting position. The movement of the moving means until the sheet is conveyed to a position is controlled.

  By the way, in the case where the creasing device is provided as in the above-described image forming system, the sheet size in the sheet conveyance direction is shortened by the creasing when the creasing is performed. In addition, when the creased sheets are folded and folded, the crease increases in the thickness direction of the sheet, and the booklet size increases. Further, the end portions of the sheet are not aligned due to the influence of the creasing portion. Therefore, even if the cutting position is controlled based on the position at which the end of the booklet is detected as in the invention described in Patent Document 1, the fore ends of the individual booklets are not aligned.

  That is, in the conventional edge cutting, since the influence of the edge alignment accuracy due to the presence / absence of the creasing process is not taken into consideration, the sheet size information and / or the inputted cutting position information regardless of whether or not the creasing process is performed. The cutting position was determined based on For this reason, when the creasing process is performed as described above, the edge alignment quality after the edge cutting must be reduced, and the reduction in the accuracy of the edge after the creasing process has not been solved.

  Therefore, the problem to be solved by the present invention is to maintain the edge alignment quality of the booklet after edge cutting even when the creasing process is performed.

  In order to solve the above problems, the first means includes a creasing device that performs creasing processing on a sheet, a folding device that performs center folding processing on the sheet, and a fore edge cutting device that cuts a fore edge portion of a booklet that has been subjected to folding processing. Are connected to each other, and the cutting position from the sheet edge of the small edge cutting process is determined based on the information for estimating the presence or absence of the creasing and the amount of deviation when the creasing is performed and folded. A means for determining is provided.

  The second means is that in the first means, the means for determining the cutting position is that the booklet subjected to the creasing process is from the sheet end portion to the cutting position than the booklet not subjected to the creasing process. The cutting position is determined so as to increase the distance.

  The third means is characterized in that in the first or second means, the information for estimating the deviation amount is the number of sheets.

  The fourth means is characterized in that in the first or second means, the information for estimating the deviation amount is the number of sheets subjected to scoring processing.

  A fifth means is characterized in that, in any one of the first to fourth means, the information for estimating the shift amount is a sheet thickness subjected to a creasing process.

  The sixth means further comprises means for inputting the sheet cutting position in any of the first to fifth means, and means for determining the cutting position when the sheet cutting position is inputted from the input means. The cutting position is determined by giving priority to the input cutting position over the cutting position determined by the above.

  According to a seventh means, in the sixth means, the value of the distance from the sheet edge to the cutting position determined by the determining means is larger than the input value of the distance from the sheet edge to the cutting position. In this case, the cutting process is executed at the cutting position determined by the determining means.

  The eighth means is characterized by an image forming system comprising a sheet processing system according to any one of the first to seventh means, and an image forming apparatus connected to the front stage of the scoring device.

  Ninth means is a sheet processing in which a creasing device that performs creasing processing on a sheet, a folding device that performs half-folding processing on a sheet, and a fork cutting device that cuts a fore edge of a folded booklet. A method for determining a trimming position in a system, wherein a first step of acquiring creasing information indicating whether or not creasing processing is performed, and information on the number of sheets and / or sheet thickness subjected to creasing processing from a sheet bundle end portion A second step for determining the sheet cutting position defined by the distance, a third step for determining whether or not a cutting position is designated by the user, and a second step when the cutting position is not designated by the user. The fourth process, which is the determined cutting position, and the cutting position input when the cutting position is designated by the user, and the cutting position determined in the second process is compared with the cutting position input by the user. And the fifth step When the cutting position determined in the second process is equal to or less than the cutting position input by the user in the fifth process, the cutting position is set as the cutting position input by the user. Otherwise, the cutting process is determined in the second process. And a sixth step as a cutting position.

  In the embodiment described later, the scoring device is denoted by symbol A, the folding device is denoted by symbol B, the edge cutting device is denoted by symbol C, the image forming device is denoted by symbol PR, and the means for determining the cutting position is the image forming device PR. The CPU_PRc or the CPU_Cc of the fore edge cutting device c has a means for inputting the sheet cutting position to the operation panel OP, the first step to step S101, the second step to step S102, and the third step to step S103. The fourth step corresponds to step S104, the fifth step corresponds to step S105 and step S106, and the sixth step corresponds to step S107 and step S108, respectively.

  According to the present invention, there is provided means for determining the cutting position from the sheet end of the fore edge cutting process based on information for estimating the presence or absence of the creasing and the amount of deviation when the creasing is performed and folded. Therefore, even when the creasing process is performed, it is possible to maintain the edge alignment quality of the booklet after the edge cutting.

1 is a diagram showing a schematic configuration of an image forming system in an embodiment of the present invention. It is operation | movement explanatory drawing which shows operation | movement of an image forming system, and shows a state when a sheet | seat is carried in to the creasing apparatus. FIG. 9 is an operation explanatory diagram illustrating the operation of the image forming system, and shows a state when the leading end of the sheet comes into contact with the abutting member. FIG. 10 is an operation explanatory diagram illustrating the operation of the image forming system, and shows a state when the abutting member is lowered and the sheet is further conveyed. FIG. 5 is an operation explanatory diagram illustrating the operation of the image forming system, and shows a state when a creasing process is performed at the center of the sheet. FIG. 6 is an operation explanatory diagram illustrating an operation of the image forming system, and shows a state when a sheet is conveyed to a folding processing tray of a folding device. FIG. 9 is an operation explanatory diagram illustrating the operation of the image forming system, and shows a state in which the creasing-processed sheets are stacked on the folding processing tray. FIG. 10 is an operation explanatory diagram illustrating the operation of the image forming system, showing a state where stacking of a sheet bundle subjected to creasing processing on a folding processing tray is completed. FIG. 9 is an operation explanatory diagram illustrating the operation of the image forming system, showing a state in which the sheet bundle stacked on the folding treatment tray is pushed up to the folding position by the rear end fence. FIG. 5 is an operation explanatory diagram illustrating an operation of the image forming system, showing a state where a sheet bundle is folded in half. FIG. 9 is an operation explanatory diagram illustrating the operation of the image forming system, showing a state where folding is finished and the image forming system is carried out to the fore edge trimming apparatus. FIG. 5 is an operation explanatory diagram illustrating an operation of the image forming system, and shows a state where a sheet bundle is stopped at a cutting position. FIG. 5 is an operation explanatory diagram illustrating the operation of the image forming system, and illustrates a state where a sheet bundle is cut at a cutting position. FIG. 9 is an operation explanatory diagram illustrating the operation of the image forming system, and shows a state when a sheet bundle that has been trimmed is discharged. It is a figure which shows the deviation | shift amount of the fore edge part of the sheet | seat bundle which is not implementing the creasing process. It is a figure which shows the edge part deviation | shift amount of a sheet bundle when a creasing process is implemented to all the sheets. It is a figure which shows the edge part deviation | shift amount of a sheet bundle when a creasing process is implemented to the lowest and uppermost sheets. It is a figure which shows the edge part deviation | shift amount of a sheet bundle when a creasing process is implemented to all the sheets of thick paper. 6 is a diagram showing a display screen when a user inputs on the operation panel of the image forming apparatus. 2 is a block diagram illustrating a control configuration of the image forming system according to the present exemplary embodiment. FIG. 6 is a flowchart illustrating a control procedure of cutting position determination control in the image forming system according to the present embodiment.

  According to the present invention, in a sheet processing system in which a scoring device, a folding device, and a fore edge cutting device are connected, the cutting position from the sheet end of the booklet fore edge is controlled according to the creasing processing information. is there. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of an image forming system according to an embodiment of the present invention. The image forming system includes an image forming apparatus PR that forms an image on a sheet, a creasing apparatus A that performs scoring, a folding apparatus B that performs folding processing (post-processing), and a front edge cutting that cuts a front edge of a folded booklet. The apparatus C is basically configured. Note that a system excluding the image forming apparatus PR corresponds to a sheet processing system provided at the subsequent stage of the image forming apparatus PR.

  The image forming apparatus PR visualizes and outputs image data input from a scanner, PC, etc. as a visible image on a sheet, and uses a known image forming engine such as an electrophotographic method or a droplet discharge method. The

  The creasing apparatus A includes first and second conveying means 1 and 2, a creasing unit Au, and third and fourth conveying means 3 and 4. The creasing unit Au includes a creasing member 11 and a cradle 12. The scoring member 11 and the cradle 12 sandwich the sheet to create a streak. The creasing unit Au includes a drive cam 13, a pressure spring 14, and a support member 15 that supports them. During the creasing operation, the drive cam 13 rotates and the creasing means 11 descends, and the pressure spring 14 lowers the sheet. Pressure. Reference numeral 10 denotes an abutting member that is positioned downstream of the second conveying unit 12 in the sheet conveying direction and that abuts the leading end of the sheet to correct the skew.

  On the end surface of the creasing member 11 facing the cradle 12, blades (crease blades—convex blades) for scoring are linearly provided in a direction perpendicular to the sheet conveying direction. The crease blade is formed in a blade shape with a sharp tip. On the other hand, the surface of the cradle 12 facing the crease blade has a crease groove (concave blade) into which the tip edge of the crease blade fits. Since both are formed in such a shape, when a sheet | seat is inserted | pinched, the streak by a front-end | tip shape (convex blade) and a groove shape (concave blade) is attached.

  After the scoring device A creates a streak, the sheet is fed to the downstream folding device B. The folding device B includes fifth to seventh transport means 5, 6, 7, a folding plate 20, a folding roller 21, a middle folding processing tray 22, and a rear end fence 23.

  The folding processing tray 22 is installed following the conveyance path in which the fifth to seventh conveyance means 5, 6, and 7 are installed, and a rear end fence 23 is provided at the lower end (upstream side in the conveyance direction). The folding plate 20 and the folding roller pair 21 are disposed at the substantially central portion of the folding processing tray 22, and the sheet is lifted to the folding position by the rear end fence 23. Separately, a claw means that moves up and down along the folding processing tray 22 may be provided, and the claw means may hold the sheet and lift it. The trailing edge fence 23 performs alignment in the sheet conveyance direction, and the trailing edge of the sheet discharged to the folding processing tray 22 is forcibly pressed against the trailing edge fence 11 by a return roller (not shown) to align the position of the sheet. . Further, alignment in a direction orthogonal to the transport direction is also performed by a jogger fence (not shown). The rear end fence 23 is conventionally called as such, but in this embodiment, the front end of the sheet abuts.

  The folding plate 20 presses its leading edge along the line against the aligned sheet bundle and pushes it into the nip of the pair of folding rollers 21. As a result, the sheet bundle is pushed into the nip of the pair of folding rollers 21 and is streaked at the nip. In the case where the saddle stitching process is involved, the folding process, so-called bi-folding, is performed after the binding process is performed on a portion to be streaked by a binding device (not shown).

  In the present embodiment, the first to tenth transport means 1 to 7, 24, 28, and 29 use transport rollers.

  The sheet for which the folding process is completed is sent to the downstream edge cutting apparatus C. The fore-edge cutting apparatus C includes eighth to tenth conveying means 24, 28, 29 along the conveying path 27, and a cutting portion Cu installed between the eighth and ninth conveying means 24, 28. ing. The cutting part Cu includes a cutting blade part 25a and a blade receiving part 25b across the conveyance path, a presser part 26a and a presser receiving part 26b disposed on the downstream side, and a cutting scrap disposed below the blade receiving part 25b. It consists of a storage unit 31.

  In FIG. 1, an inlet sensor SN1 is provided upstream of the first conveying means 1, a tip detection sensor SN2 is provided downstream of the creasing unit Au, and is also provided downstream of the cutting portion Cu of the small edge cutting device C. A tip detection sensor SN3 is arranged.

  2 to 14 are operation explanatory views showing the operation of the image forming system configured as described above. The operation of this image forming system will be described with reference to the drawings.

  As shown in FIG. 2, the sheet P1 sent from the image forming apparatus PR passes through the entrance sensor SN1, and the first to fourth transport units 1, 2, 3, and 4 are activated based on the detection information. . That is, the transport roller group starts to rotate. Next, as shown in FIG. 3, the sheet P <b> 1 is conveyed by the first and second conveying means 1 and 2, and the leading end of the sheet is once abutted against the abutting member 10 to correct the skew. After the skew correction is completed, the abutting member 10 descends in the direction of the arrow as shown in FIG. 4 to open the conveyance path.

  Since the conveyance path is opened, the sheet P1 can be conveyed again and is continuously conveyed, and the leading edge detection sensor SN2 detects the sheet leading edge position. The sheet P1 is conveyed by a predetermined distance on the basis of the leading edge detection signal, and as shown in FIG. 5, when the center of the sheet P1 reaches the position of the creasing member 11 of the creasing unit Au, the drive cam 13 rotates, The creasing member 11 is lowered and the sheet is pressurized by the pressure spring 14 to create a streak. As shown in FIG. 6, the sheet P <b> 1 whose creasing has been completed is conveyed to the folding device B by the third and fourth conveying means 3, 4, and the fifth to seventh conveying means 5 in the folding device B are used. 6 and 7 to the folding processing tray 22. As shown in FIG. 7, the subsequent sheets P <b> 2 and P <b> 3 are also scored by the creasing member 11, conveyed to the folding processing tray 22, and stacked. At this time, each time a sheet is conveyed, the sheet conveying direction is aligned with the rear end fence 23, and the direction orthogonal to the sheet conveying direction is aligned with a jogger (not shown).

  8 and 9, when n sheets (n: positive integer) of sheets P1 to Pn for one job are stacked and stacked on the folding processing tray 22, n sheets P1 to PN are stacked. The sheet bundle made of is pushed up to a position where the lined portion by the rear end fence 23 is opposed to the folding plate 20, so that the sheet bundle can be folded. Next, as shown in FIG. 10, the folding plate 20 moves in the direction of the arrow, and the sheet bundle P <b> 1 to Pn is pushed into the nip of the folding roller pair 21, and the folding process is performed by the folding roller pair 21. In the case of performing saddle stitching, the saddle stitcher is pushed up to a binding position of a saddle stitching stapler (not shown), and after the saddle stitching is performed, it is further pushed up to a position facing the folding plate 20.

  The folded sheet bundles P1 to Pn are conveyed to the fore edge trimming device C as shown in FIG. Then, as shown in FIG. 12, the sheet bundles P1 to Pn are conveyed by a predetermined amount from the position detected by the leading edge detection sensor SN3, and the position of the cutting position d from the sheet end of the fore edge is the position of the cutting blade 25a. Stop at the position just below. The cutting position d is determined by the number of sheets, the sheet thickness, or the like, or determined by designation by the user.

  When the fore edge cutting position is determined as shown in FIG. 12, the cutting blade part 25a is lowered as shown in FIG. 13, and the fore edge parts of the sheet bundles P1 to Pn are cut. As shown in FIG. 14, the sheet bundles P <b> 1 to PN with the cut edge portions are conveyed to the paper discharge tray 30 by the ninth and tenth conveying means 28 and 29. Further, the trimmed waste Pa is stored in the trimmed waste storage unit 31.

  The above is a series of operations from the scoring process to the edge cutting process.

  As shown in FIGS. 12 and 13, when performing fore edge cutting, after the sheet bundles P1 to Pn are conveyed to the fore edge cutting device C, the position of the cutting position d is from the sheet end of the fore edge part. Then, the sheet is conveyed to a position directly below the cutting blade portion 25a, stops at that position, and is cut.

FIG. 15 is a diagram showing a deviation amount of the edge portions of the sheet bundles P1 to PN that are not subjected to the creasing process, and the deviation amount in FIG. 15 is “x1”. FIG. 16 is a diagram showing the amount of deviation of the edge portions of the sheet bundles P1 to PN when the creasing process is performed on all sheets, and the amount of deviation in FIG. 16 is “x2” which is larger than “x1”. This is because by performing the creasing process, a sheet bulge portion 32 is generated in the creasing portion as shown in FIG. for that reason,
x1 = x2
It will never be.

  Therefore, in the present embodiment, the edge cutting position d is controlled according to the creasing process information. As a result, it is possible to perform the edge cutting at an appropriate position, and it is possible to maintain the quality of the edge cutting part.

That is, the amount of deviation of the sheet bundle edge is x1 <X2.
Therefore, the booklet with the creasing process is controlled so that the distance d from the sheet end to the cutting position is larger than the booklet without the creasing process. Unevenness of parts can be prevented.

  For the distance to be increased, the relationship between the paper thickness, the number of sheets, and the deviation amount is previously converted into data. Then, it is executed by the fore edge cutting device C. By controlling in this way, cutting is not performed at a portion where the sheet edges are uneven, so that the quality of the small edge cutting portion can be maintained. Further, the relationship between the paper thickness, the number of sheets, and the amount of deviation of the data converted into data is held in a memory (not shown) as cutting position determination information. In addition, this control is referred to as cutting position determination control in the present embodiment.

FIG. 17 is a diagram illustrating the amount of misalignment of the edge portion of the sheet bundle when the creasing process is performed only on the outermost paper and the innermost paper. Since the fore edge deviation amount differs depending on the number of sheets on which the creasing process has been performed, compared with the deviation amount “x2” shown in FIG.
x3 <x2
It becomes. For this reason, the control is performed so that the distance d from the sheet edge to the cutting position is smaller in the case of a booklet having a small number of sheets subjected to the creasing process. Also in this case, the relationship between the paper thickness, the number of sheets, the amount of deviation, and the number of scoring sheets is converted into data in advance, and the CPU d of the image forming apparatus PR determines (estimates) the distance d at which the fore edges are aligned, and the fore edge cutting apparatus C Is executed by the edge cutting apparatus C.

FIG. 18 is a diagram illustrating the amount of misalignment of the edge portion of the sheet bundle when the creasing process is performed on the thick paper and the folding process is performed. When the sheet subjected to the creasing process becomes thicker, the bulging part 33 generated by the creasing process becomes larger than the bulging part 32 of the plain paper shown in FIG.
x2 <x4
It becomes. Therefore, in the case of the booklet having the thick sheet thickness subjected to the creasing process, the distance d from the sheet edge to the cutting position is controlled to be larger. In this case, as described with reference to FIG. 16, since the paper thickness data is provided, the distance d may be set using this data.

  The sheet cutting position is thus determined (estimated) by the CPU of the image forming apparatus PR and executed by the fore edge cutting apparatus C. However, the user can arbitrarily determine the fore edge cutting position. FIG. 19 is a diagram showing a display state of the operation panel OP of the image forming apparatus PR in the image forming system shown in FIG. This display state indicates a state where the user designates the sheet cutting position as “+1 mm”. Of course, when the user designates, the cutting position determination control by the CPU of the image forming apparatus PR is not performed.

  However, when the input sheet cutting position is smaller than the cutting position determined (estimated) from the scoring process information, cutting position determination control by the CPU by the image forming apparatus PR is performed. Thereby, the quality of a small edge cutting part can be maintained.

  Of course, as the number of sheets increases, the shift amounts x1, x2, x3, and x4 also increase, respectively, and the comparison of FIGS. 15 to 18 is for the same number of sheets.

  Further, in the present embodiment, the creasing process information is information relating to the presence / absence of creasing, the number of sheets, the sheet thickness, the number of sheets subjected to creasing, and the like. The cutting position Pc is a position corresponding to the end of the cover sheet, that is, the side that is not the end of the sheet bundle in the drawings showing the shift amounts x1, x2, x3, and x4 shown in FIGS.

  FIG. 20 is a block diagram showing a control configuration of the image forming system according to the present embodiment. In the image forming system according to the present embodiment, the image forming apparatus PR, the folding apparatus A, the folding apparatus B, and the fore edge cutting apparatus C are connected in series in this order. In this case, not only the sheet conveyance path is in series, but also the control system is serially connected. That is, the image forming apparatus PR is CPU_PRc and the communication port (interface) PRif, the folding apparatus A is CPU_Ac and the first and second communication ports (interfaces) Aif1 and Aif2 on the upstream and downstream sides in the connection direction, and the folding apparatus B is The CPU_Bc and the first and second communication ports (interfaces) Bif1 and Bif2 on the upstream side and the downstream side in the connection direction, and the fore edge cutting device C include the CPU_Cc and the communication port (interface) Cif, and receive control signals from the image forming apparatus PR. Each communication port is transmitted to a downstream device via the CPU, and a status signal, a signal corresponding to an inquiry, or the like is transmitted from the downstream side to the upstream side via each communication port and the CPU. Thereby, the image forming system functions as one control body. Each device also has a ROM and a RAM (not shown). Each CPU develops a control program stored in the ROM of each device in the RAM, and is defined by the program while using the RAM as a work area and a data buffer. Control.

  FIG. 21 is a flowchart showing a control procedure for cutting position determination control in the image forming system configured as described above. In the figure, first, scoring information indicating the presence / absence of a scoring process is acquired (step S101), and a sheet cutting position dc is determined from cutting position determination information such as the number of sheets subjected to scoring process and sheet thickness ( Step S102).

Next, it is determined whether or not a cutting position has been designated by the user (step S103). If there is no designation, the cutting position d is set to the distance dc from the end of the sheet bundle (step S104), and the cutting process is executed (step S109). When the cutting position is designated, the input cutting position di is acquired (step S105), and the cutting position dc determined in step S102 is compared with the cutting position di input by the user (step S106).
dc ≦ di
In this case, the cutting position d is set to the cutting position di input by the user (step S107), and the cutting process is executed (step S109).

In contrast,
dc> di
In this case, the cutting position d is set to the cutting position dc determined from the cutting position determination information (step S108), and the cutting process is executed (step S109).

  In this control procedure, from step S101 to step S108, the CPU_PRc of the image forming apparatus PR executes basically to instruct the edge cutting process C, and the cutting process is executed in step S109 according to these instructions. This control procedure is performed by controlling the CPU_PRc of the image forming apparatus PR as a main CPU of the system, so that the cutting position determination control can be executed by the CPU_Cc of the fore edge cutting apparatus C. You can also.

  As described above, according to the present embodiment, the cutting position determination control is performed on the sheet bundle subjected to the creasing process. Can be maintained.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention, and all technical matters included in the technical idea described in the claims are included. The subject of the present invention. The above embodiment shows a preferable example, but those skilled in the art can realize various alternatives, modifications, variations, and improvements from the contents disclosed in this specification, These are included within the scope defined by the appended claims.

A creasing device B folding device C fork cutting device OP operation panel P1 sheet P1 to PN sheet bundle (booklet)
PR image forming apparatus PRc, Cc CPU

Japanese Patent No. 4079141

Claims (9)

A sheet processing system in which a creasing device that performs creasing processing on a sheet, a folding device that performs center folding processing on a sheet, and a fore edge cutting device that cuts a fore edge portion of a folded booklet,
It is characterized by comprising means for determining the cutting position from the sheet edge of the fore edge cutting process based on information for estimating the presence or absence of the creasing and the amount of misalignment when performing creasing and folding. Sheet processing system. The sheet processing system according to claim 1,
The means for determining the cutting position determines the cutting position so that the booklet subjected to the creasing process has a larger distance from the sheet edge to the cutting position than the booklet not subjected to the creasing process. A sheet processing system characterized by that. The sheet processing system according to claim 1 or 2,
The sheet processing system is characterized in that the information for estimating the deviation amount is the number of sheets. The sheet processing system according to claim 1 or 2,
The sheet processing system is characterized in that the information for estimating the deviation amount is the number of sheets subjected to scoring processing. The sheet processing system according to any one of claims 1 to 4,
The sheet processing system characterized in that the information for estimating the deviation amount is a sheet thickness subjected to scoring processing. A sheet processing system according to any one of claims 1 to 5,
A means for inputting a sheet cutting position;
When a sheet cutting position is input from the input means, the sheet processing is characterized in that the cutting position is determined in preference to the cutting position input by the cutting position determined by the means for determining the cutting position. system. The sheet processing system according to claim 6,
When the value of the distance from the sheet edge to the cutting position determined by the determining means is larger than the input value of the distance from the sheet edge to the cutting position, the cutting determined by the determining means A sheet processing system that performs cutting processing at a position. A sheet processing system according to any one of claims 1 to 7,
An image forming apparatus connected to a front stage of the creasing apparatus;
An image forming system comprising: Determination of the edge cutting position in a sheet processing system in which a creasing device that performs creasing processing on a sheet, a folding device that performs folding processing on a sheet, and a fork cutting device that cuts a fore edge of a folded booklet A method,
A first step of acquiring scoring information indicating the presence or absence of scoring processing;
A second step of determining a sheet cutting position defined by the distance from the end of the sheet bundle from the information on the number of sheets and / or the sheet thickness subjected to the creasing process;
A third step of determining whether or not a cutting position is designated by the user;
A fourth step of setting the cutting position determined in the second step when the user does not specify the cutting position;
A fifth step of acquiring a cutting position input when a cutting position is designated by the user and comparing the cutting position determined in the second step with the cutting position input by the user;
When the cutting position determined in the second process is equal to or less than the cutting position input by the user in the fifth process, the cutting position is set as the cutting position input by the user. Otherwise, the cutting process is determined in the second process. A sixth step as a cutting position;
And a method for determining a cutting edge position.

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