JP2016003115A - Sheet processing device, image forming apparatus, control method for them, program, and image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism that suppresses a deviation from a streaking position desired by a user, by determining the streaking position in consideration of the number of times of a streaking operation and sheet shrinkage caused by the streaking operation.SOLUTION: When execution of streaking processing is set in a plurality of streaking positions in one sheet, a sheet processing device executes the streaking processing in the set streaking position, with regard to the first streaking position, and executes the streaking processing in a position set by correcting the set streaking position on the basis of sheet shrinkage caused by the already-completed streaking processing, with regard to second and subsequent streaking processing operations.

Description

  The present invention relates to a sheet processing apparatus, an image forming apparatus, a control method thereof, a program, and an image forming system, to which a post-processing apparatus capable of performing creasing processing is connected.

2. Description of the Related Art Image forming apparatuses that are connected to a post-processing device that performs post-processing such as binding processing and folding processing on paper after printing processing have become widespread. Various deliverables can be created by performing multiple post-processing. One post-processing device is a creasing device. The creasing is a process of making a crease at a position where the paper is folded. By pressing the convex creasing die and the concave creasing die against the paper, the paper can be creased at the pressed position. The scoring has the effect of preventing toner peeling and cracking of the paper when folding the paper in the folding process. The creasing position of the image forming apparatus is controlled by calculating a conveyance distance to the sheet creasing position using a sensor and a roller.
Patent Document 1 proposes a technique for correcting a deflection by applying tension to a sheet by gripping portions arranged on the upstream side and the downstream side in the sheet conveyance direction when performing creasing. Accordingly, the folding portion does not bulge due to the thickness of the paper, and the folding height of the folding portion can be reduced without reducing productivity.

JP 2011-57363 A

  However, the above prior art has the following problems. For example, in the creasing process, when the creasing dies are pressed against each other to make a crease, the sheet may be bent, and the entire length of the sheet may be shorter than before the creasing. However, when the user designates a creasing position using a printer driver or the like, the user cannot be aware of the creasing order or the paper shrinkage due to the creasing. For this reason, the position where the user wants to perform creasing is specified at the position on the sheet before creasing regardless of the number of creasing.

  Therefore, when performing a plurality of creasings, there is a possibility that the user would shift to a position where the user originally wants to perform scoring due to the shrinkage of the paper due to the creasing that has already been performed.

  The present invention has been made in view of the above-described problems. By determining the scoring position in consideration of the number of scoring times and the shrinkage of the paper due to the scoring, the deviation from the desired scoring position is determined. The purpose is to provide a mechanism to suppress.

  The present invention is a sheet processing apparatus, a crease unit for creasing an image-formed sheet, and a setting unit for setting a crease position in the sheet for executing a crease process by the crease unit. When the setting means sets execution of a creasing process at a plurality of creasing positions in one sheet, the first creasing position is set at the creasing position set by the setting means. The creasing process is executed by the creasing unit, and for the second and subsequent creasing processes, the creasing position set by the setting unit is corrected based on the shrinkage of the sheet generated by the already completed creasing process. Control means for executing a creasing process by the creasing means at a position.

  In addition, the image forming apparatus includes an image forming unit that forms an image on a sheet, a creasing unit that creates a streak on the sheet image-formed by the image forming unit, and a creasing process that is performed by the creasing unit. A setting unit for setting a creasing position in the sheet, and execution of a creasing process at a plurality of creasing positions in one sheet by the setting unit. Performs the creasing process by the creasing means at the creasing position set by the setting means, and the creasing position set by the setting means has already been completed for the second and subsequent creasing processes. Control means for executing the creasing process by the creasing means at a position corrected based on the shrinkage of the sheet generated by the creasing process. To.

  According to the present invention, it is possible to suppress a deviation from a desired creasing position by determining a creasing position in consideration of the number of creasing and the shrinkage of the paper due to the creasing.

1 is an overall view of an image forming apparatus. FIG. 3 is a block diagram illustrating a control configuration of a main controller of the image forming apparatus. The figure which looked at the paper before and after creasing. The figure which shows the table | surface of the amount of shrinkage at the time of creasing for every paper. The figure which shows the example of the deliverable which performs a creasing process of multiple times. The figure which bent the product of FIG. 5 in the creasing position. The flowchart at the time of creasing of the Example of this invention. The figure which shows the creasing position in the case of controlling from the paper front-end | tip. The figure which shows the creasing position in the case of controlling from the paper center. The figure which shows the setting screen of the creasing in Example 1. FIG. The figure which shows the paper setting screen of the creased paper. The detailed view of the creasing part in a 1st embodiment. The figure which shows the structure of the creasing apparatus in 2nd Embodiment. The detail drawing of the creasing part in 2nd Embodiment. The flowchart which shows the process sequence in 1st Embodiment. The figure which shows the setting screen of creasing in 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the present invention according to the claims, and all combinations of features described in the present embodiments are not necessarily essential to the solution means of the present invention. .

<First Embodiment>
<Configuration of image forming system>
First, the configuration of an image forming system according to an embodiment of the present invention will be described with reference to FIG. The image forming system has the following configuration. In FIG. 1, 101 is an image forming apparatus, and 102 is an image fixing apparatus. A paper feeding device 120 is connected to the image forming apparatus 101. A plurality of paper feeding devices can be connected, and another paper feeding device 121 is connected to the paper feeding device 120. The image fixing apparatus 102 is connected to a creasing device 151 which is an example of a sheet processing apparatus, and performs creasing on a printed sheet (sheet). For the creasing device 151. A paper discharge device 134 is connected. Here, the image forming apparatus 101 and the creasing apparatus 151 will be described as separate apparatuses. However, the present invention is not limited to this, and the image forming apparatus 101 may include the creasing apparatus 151. Good.

  Reference numerals 105 and 106 in the image forming apparatus 101 denote sheet feeding units. Reference numerals 107 to 110 denote developing units, which are composed of four color stations of Y, M, C, and K in order to form a color image. The image formed here is temporarily transferred to the intermediate transfer belt 111. The temporarily transferred image is transferred to the paper fed through the paper conveyance path 104 at the secondary transfer position 112 as the intermediate transfer belt 111 rotates. The sheet on which the image has been transferred is conveyed to the image fixing device 102 and heated and pressed by the fixing unit 113, whereby the image is fixed on the sheet. The sheet that has passed through the fixing device 113 is conveyed to the creasing device 151 through the sheet conveying path 115 and the sheet conveying path 117. Depending on the type of paper, additional heating and pressurization are performed by the second fixing device 114, and then the paper is conveyed to the creasing device 151 through the paper conveyance path 116 and the paper conveyance path 117. When images are printed on both sides of a sheet, the sheet is reversed by a sheet reversing path 118 and then printed on the back side through the sheet conveying path 119 and the sheet conveying path 104.

  A scanner unit 161 is connected to the image fixing device 102. In the scanner unit 161, an image on a sheet set on a platen is read by a CCD, converted into image data, and the image data is stored in the HDD 211 in FIG. The paper can also be fed from the paper feeding device 120 or the paper feeding device 121. The sheets fed from the sheet feeding units 122, 123, and 124 of the sheet feeding device 120 are conveyed to the image forming apparatus 101 through the sheet conveying path 125 and the sheet conveying path 126. The sheets fed from the sheet feeding units 129, 130, and 131 of the sheet feeding device 121 are conveyed to the image forming apparatus 101 through the sheet conveying path 132, the sheet conveying path 133, the sheet conveying path 125, and the sheet conveying path 126. The The paper feeding device 120 has a function of detecting a multi-feed transported in a state where a plurality of sheets are overlapped. When a multi-feed is detected, printing on the paper is not performed, and the paper transport path is set. The paper transport path 127 is switched from the normal 126 and discharged to the escape tray 128.

  Next, the creasing apparatus 151 will be described. The creasing device 151 is a device for performing creasing at a predetermined position on the paper. The sheet conveyed through the sheet conveying path 152 and the sheet conveying path 154 is creased by sandwiching the sheet between the convex creasing die 155 and the concave creasing die 156. The sheet that has been scored is conveyed to the paper discharge device 134 through the paper conveyance path 157. When the sheet is not creased, the sheet is conveyed to the paper discharge device 134 through the sheet conveyance path 125 and the sheet conveyance path 153.

  Here, with reference to FIG. 12, the creasing part of the creasing apparatus 151 is demonstrated in detail. The sheet is conveyed to the scoring position by rotating the roller 1202 through the conveyance path 1201. A sensor 1205 is installed in the paper conveyance path, and can detect conveyance of the paper. The distance from the sensor 1205 to the leading edge of the sheet can be calculated based on the time when the conveyance of the sheet is detected and the amount of rotation of the roller 1202, and the distance from the sensor 1205 to the alignment position is taken into consideration. Can be controlled.

  The sheet conveyed to the creasing position is sandwiched between a convex creasing die 155 and a concave creasing die 156, and a crease is made. In the case where the folding line is attached twice by conveying the paper once, after the first folding line, the roller 1202 is rotated by the distance between the first and second folding line positions, and the position is adjusted. Do the second creasing. The same applies to the case where the creasing is performed three times or more. Here, when the roller 1202 can rotate only in a certain direction, the creasing is performed in order from the creasing position close to the leading edge of the sheet. When the roller 1202 can be rotated in the reverse direction, creasing can be performed in an arbitrary order at a plurality of creasing positions.

  Returning to the description of FIG. Next, the paper discharge device 134 will be described. It has a function of performing post-processing on printed paper, and can perform stapling, punching, and saddle stitching. The paper discharge device 134 includes a paper discharge unit 146 and a paper discharge unit 147, and the paper that has passed through the paper transport path 139 and the paper transport path 141 passes through the paper transport path 139 and the paper transport path 142 to the paper discharge unit 146. The passed paper is discharged to the paper discharge unit 147. The paper passing through the paper conveyance path 142 can be subjected to processing such as stapling and punching by the post-processing unit 143. The paper placed on the paper insertion unit 138 can pass through the paper conveyance path 140 and insert a paper different from the printed paper. The saddle stitching processing unit 144 staples the center of the sheet conveyed through the sheet conveyance path 139, folds the sheet in half, and discharges the sheet to the sheet discharge unit 137 through the sheet conveyance path 145.

<Control Configuration of Image Forming Apparatus>
Next, the control configuration of the main controller 201 of the image forming apparatus 101 will be described with reference to FIG. The main controller 201 of the image forming apparatus 101 includes a CPU 205, a RAM 206, an operation unit I / F 207, a network I / F 208, a modem 209, a ROM 210, and an HDD 211. The main controller 201 includes a RIPI / F 214, a data compression unit 215, a device I / F 216, and an image processing unit 217 via an image bus I / F 213. Reference numeral 212 denotes a CPU bus, and 228 is an image bus. The paper feeding device 120, the paper feeding device 121, the creasing device 151, and the paper discharge device 134 are connected via the data bus 221, and the main controller 201 can control the operation. The network I / F 208 is connected with a network cable 203 for connecting to an external device via a network. The modem 209 is connected to a line cable 204 for connecting to an external device via a telephone line.

  The CPU 205 operates a program for controlling the entire main controller 201. The RAM 206 is managed by a program that runs on the CPU 205. The RAM 206 is used for purposes such as a reception buffer for temporarily storing data received from the outside and an image data buffer for temporarily storing image data rasterized by the RIP 220. The ROM 210 stores programs and data that operate on the CPU 205. The HDD 211 is a non-volatile storage device that can store various data for a long time.

  The operation unit I / F 207 is an interface for connecting the operation unit 202 and the main controller 201. The image bus I / F 213 is an interface for connecting the CPU bus 212 and the image bus 228. A RIP 220 is connected to the RIPI / F 214 via a data bus 219. The RIP 220 is a rasterization board having a function of converting image description data input from the outside into bitmap image data. The RIPI / F 214 is an interface for connecting the RIP 220 and the image bus I / F 213 through the data bus 219. The data compression unit 215 compresses the image data. The device I / F 216 is connected to a paper feeding device 120, a paper feeding device 121, a creasing device 151, and a paper delivery device 134 via a data bus 221. In accordance with a signal instructed from the operation unit 202 or an external device via the network cable 203, the CPU 205 feeds the paper feeding device 120, the paper feeding device 121, the creasing device 151, and the paper ejection via the device I / F 216 and the data bus 221. A control command is issued to the device 134. The image processing unit 217 performs various types of image processing on the bitmap image data generated by the RIP 220. The image processing unit 217 has a function of digitally processing bitmap image data.

<Strengthening>
Next, creasing will be described with reference to FIGS. FIG. 3 is a side view of the sheet 301 before creasing and the sheet 303 after creasing. A creasing 302 is applied to the sheet 303 after creasing. As shown in FIG. 3, the total length 305 of the sheet 303 after creasing is shorter than the total length 304 of the sheet before creasing.

  FIG. 4 shows an example of a table of shrinkage amount at the time of creasing for each sheet. The amount of shrinkage at the time of creasing is determined according to the type of paper, and the data on the amount of shrinkage for each paper is stored in advance in the HDD 211 of the image forming apparatus 101. The amount of shrinkage of the paper is considered to change depending on the shape of the creasing die, the strength when pressing, the depth of the groove when creasing, and the like. Therefore, it is desirable that data on the amount of shrinkage when the paper type, die shape, pressing strength, and groove depth are changed is stored in advance in the HDD 211 of the image forming apparatus 101. As shown in FIG. 4, the amount of shrinkage corresponding to the basis weight is defined. Generally, when the basis weight increases, the amount of shrinkage is reduced. Note that the table shown in FIG. 4 is an example, and there is no intention to limit the paper or the like applied to the present invention.

  FIG. 5 shows an example of a product (printed material) for performing a plurality of creasing processes. A plurality of folding positions 501 indicated by dotted lines in the drawing are located at equal intervals, and indicate positions for creasing. FIG. 6 shows a state where the product of FIG. 5 is bent at the creasing position 601. Since folding and trough folding are alternately performed at the folding position 501, it is convenient for small folding and carrying, so it is used in brochures and the like. In addition to the deliverable that performs multiple creasing processing, bookbinding printing that performs multiple folding processing such as case binding, only folding lines are applied to multiple positions, and folded at any position according to the paper thickness etc. There are files that can be used.

<Processing procedure>
Next, with reference to FIG. 15, a processing procedure of image forming processing, scoring processing, and post-processing in the present embodiment will be described. Processing described below is performed by the CPU 205 of the main controller 201 of the image forming apparatus 101 in accordance with a program stored in the ROM 210. The processing described below will be described with respect to a case where it is realized by the CPU 205 of the image forming apparatus 101. However, the present invention is not limited to this, and is realized by the control unit of the scoring device 151 which is a sheet processing apparatus. Also good.

  In step S1501, the CPU 205 determines whether a job has been received. If no job has been received, the processing in S1501 is repeated until the job is received. In step S1502, the CPU 205 analyzes the content of the received job. The job analysis information includes scoring designation and paper type, and the analyzed job information is stored in the HDD 211 of the image forming apparatus 101.

  In step S1503, the CPU 205 executes print processing and prints an image on a sheet. In step S1504, the CPU 205 acquires the job information stored in the HDD 211 in step S1502, and determines whether there is a scoring designation. If there is a creasing designation in S1504, the process proceeds to S1505, and the CPU 205 executes a creasing process and proceeds to S1506. Details of the scoring process will be described later with reference to FIG. On the other hand, if no creasing is specified, the process proceeds to S1506.

  In step S1506, the CPU 205 acquires job information stored in the HDD 211, and determines whether there is another page to be printed. If there is another page to be printed, the process proceeds to S1503, and if there is no page, the process proceeds to S1507. In step S1507, the CPU 205 determines whether post-processing is designated. Post-processing designation includes stapling, punching, and saddle stitching. If there is post-processing designation, in step S1508, the CPU 205 executes post-processing and ends the processing. If there is no post-processing designation, the process is terminated as it is.

<Screase processing procedure>
Next, with reference to FIG. 7, a procedure of processing performed by the CPU 205 when scoring is described. Processing described below is performed by the CPU 205 of the main controller 201 of the image forming apparatus 101 in accordance with a program stored in the ROM 210. The processing described below will be described with respect to a case where it is realized by the CPU 205 of the image forming apparatus 101. However, the present invention is not limited to this, and is realized by the control unit of the scoring device 151 which is a sheet processing apparatus. Also good.

  In step S <b> 701, the CPU 205 acquires a creasing position X for the next creasing to be performed. As a method for specifying the creasing position X, designation by a printer driver for each job, designation by a user input via a setting screen of the image forming apparatus 101, and the like can be considered. FIG. 10 is an example of a method for specifying the creasing, and shows a screen 1000 displayed on the operation unit 202 of the image forming apparatus 101. On the screen 1000, a plurality of creasing positions and creasing directions can be designated, and the creasing position can be designated by the distance from the leading edge with respect to a sheet that has not been creasing. In the screen 1000, creasing is specified on the surface at the positions of 70.0 mm, 140.0 mm, and 210.0 mm from the front end of the sheet. The creasing specification information specified on the screen 1000 is stored in the HDD 211 of the image forming apparatus 101. In S701, the information is referred to.

  In step S <b> 702, the CPU 205 determines whether there is already a creasing process for the sheet. As the case where the paper has already been creased, there is a case where the crease position is designated for a second time or later, or a case where the creased paper is supplied to the paper feeding device 120. Conceivable. FIG. 11 is an example of a screen 1100 for registering paper settings for a creased paper according to a user input, and is displayed on the operation unit 202 of the image forming apparatus 101. On the screen 1100, a creasing position is set by a creasing position designation 1101 in accordance with a user input. If it is determined in S702 that the sheet is not already creased, the process proceeds to S711, and X acquired in S701 is set as a crease position. The setting information of the creased paper set on the screen 1100 is stored in the HDD 211 of the image forming apparatus 101. In S <b> 702, if the paper has already been creased in the setting of the creased paper stored in the HDD 211, or if there is a crease designation in addition to S <b> 709 once, it is already creased. It is determined that the paper has been printed.

  If it is determined in step S702 that the paper has already been creased, the process advances to step S703, and the CPU 205 acquires the setting of the creased paper stored in the HDD 211, and acquires the position and number of times that have already been creased. In step S <b> 704, the CPU 205 compares the number of creasing specified positions X acquired in step S <b> 701 with the number of positions that have already been crooked acquired in step S <b> 703. Here, the scoring frequency applied to the front end side in the paper transport direction from X is A, and the scoring frequency applied to the rear end side in the paper transport direction from X is B.

  In step S <b> 705, the CPU 205 acquires a misalignment amount E corresponding to the paper type. As described with reference to FIG. 4, the data of the paper type and the misalignment amount are stored in advance in the HDD 211 of the image forming apparatus 101. Therefore, the CPU 205 acquires a desired deviation amount from the table shown in FIG. 4 using the target paper type as a search keyword.

  In step S <b> 706, the CPU 205 acquires from the HDD 211 a method for measuring the position of the creasing position at the time of creasing, and determines. If the measurement is performed from the front end side of the sheet, the process proceeds to S707. Otherwise, the process proceeds to S710. In the present embodiment, it is assumed that the creasing position is measured from the front end side of the sheet. Accordingly, the process proceeds to S707. The case where the scoring position is measured by the distance from the center of the sheet will be described in a second embodiment to be described later.

  In step S <b> 707, the CPU 205 determines the scoring position to be a position shifted from the designated position X acquired in step S <b> 701 by A * E toward the front end of the sheet. In step S708, the CPU 205 performs a creasing process at the creasing position determined in step S707. In step S709, the CPU 205 determines whether there is another scoring designation, and if there is, proceeds to step S701. On the other hand, if there is no other creasing designation, the creasing process is terminated.

<Position position>
Next, with reference to FIG. 8, the creasing position when the creasing position is measured from the front end side of the sheet will be described. As the creasing position set by the user, the creasing position 801 is 70.0 mm from the leading edge of the sheet, the creasing position 802 is 140.0 mm from the leading edge of the sheet, and the creasing position 803 is 210.0 mm from the leading edge of the sheet. A case where the order of creasing is performed in the order of creasing position 801, creasing position 802, and creasing position 803 will be described.

  The first creasing can be performed without shifting to the designated position 801. In the second creasing, since the first creasing was performed between the leading edge of the sheet and the creasing position 802, the distance from the leading edge of the sheet to the creasing position 802 is a position 805 of 140.0 mm from the leading edge of the sheet. The position 804 is 140.0-Emm. Therefore, the second creasing is performed at the position 804. In the third creasing, the first and second creasings are performed between the leading edge of the sheet and the creasing position 803. Therefore, the distance from the leading edge of the sheet to the creasing position 803 is 210.0 mm from the leading edge of the sheet. Instead of the position 807, the position 806 is 140.0-2 Emm. Therefore, the third creasing is performed at the position 806.

  In FIG. 8, when the order of creasing can be controlled, by performing in order from the position 803 far from the leading edge of the sheet to the position 802 and the position 801, the cause of the deviation without adjusting the creasing position is performed. Can be suppressed. However, in this case, the creasing is performed in the reverse order of the paper transport direction, and the time required for paper transport increases.

  As described above, in the sheet processing apparatus according to the present embodiment, when the execution of the creasing process is set at a plurality of creasing positions in one sheet, the first creasing position is set. The creasing process is executed at the creasing position. On the other hand, for the second and subsequent creasing processes, the sheet processing apparatus executes the creasing process at a position where the set creasing position is corrected based on the shrinkage of the sheet generated by the already completed creasing process. . As a result, according to the present embodiment, even when the paper shrinks due to the creasing, when the creasing process is performed a plurality of times, a shift between the creasing position desired by the user and the actual creasing position is prevented. Can do.

<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described. In the first embodiment, the flow of processing when the creasing position control is measured from the front end of the paper has been described. In the present embodiment, the case where the creasing position is measured from the center of the paper will be described. The folding process and the creasing process may be performed at the center of the sheet, such as when folding in two. By controlling the creasing position from the center of the paper, it is possible to reduce an error when calculating the transport distance when the creasing position is controlled from the front edge of the paper.

<Screeting device>
First, with reference to FIG. 13, the creasing apparatus according to the present embodiment will be described. A creasing device 1301 according to the present embodiment is another form of the creasing device 151 shown in FIG. In the creasing device 1301, the sheet conveyed through the sheet conveyance path 1303 is folded by pinching the sheet between the convex creasing die 1306 and the concave creasing die 1305. The sheet on which the creasing has been performed is conveyed to the paper discharge device 134 through the paper conveyance path 1304. When the sheet is not creased, the sheet is conveyed to the paper discharge device 134 through the sheet conveyance path 1302.

  The creasing portion of the creasing device 1301 will be described in more detail with reference to FIG. The sheet is conveyed to the scoring position by the roller 1402 rotating through the conveyance path 1303. A sensor 1405 is installed in the paper conveyance path 1303 and can detect conveyance of the paper. When the leading edge of the conveyed sheet reaches the position of the abutting plate 1407 on the leading edge side of the sheet, the abutting plate 1407 on the leading edge side of the sheet and the abutting plate 1406 on the trailing edge side of the sheet are moved to the center side of the sheet. I do. Here, the abutting plate 1407 on the front end side of the sheet and the abutting plate 1406 on the rear end side of the sheet operate symmetrically with respect to the center positions of the abutting plate 1407 on the front end side and the abutting plate 1406 on the rear end side of the sheet. Is controlled to do. Therefore, the center position of the sheet, the center position of the abutting plate 1407 on the front end side, and the abutting plate 1406 on the rear end side of the sheet are always the same position. After the alignment of the sheets, the convex creasing die 1305 and the concave creasing die 1306 are moved to the creasing position to perform creasing.

  If the crease is to be applied twice in one paper transport, after the first crease is made, the abutment plate 1407 on the front end of the paper and the abutment plate 1406 on the rear end of the paper are moved to the center of the paper. The center position of the paper is aligned again. Next, the convex creasing die 1305 and the concave creasing die 1306 are moved to the second creasing position to perform creasing. The same applies to the case where the creasing is performed three times or more.

<Processing procedure>
In the present embodiment, the image forming process, the scoring process, and the post process are the same as those in the flowchart of FIG. 15 described in the first embodiment, and a description thereof will be omitted. The procedure of the scoring process is the same as that in the flowchart shown in FIG. 7, but in this embodiment, since it is determined in S706 that the scoring position is measured from the distance from the center of the sheet, the process proceeds to S710. Since the other processes are the same, redundant description is omitted. The processing described below will be described with respect to a case where it is realized by the CPU 205 of the image forming apparatus 101. However, the present invention is not limited to this, and is realized by the control unit of the scoring device 151 which is a sheet processing apparatus. Also good.

  In step S <b> 701, the CPU 205 acquires information on the specified position X for scoring from the HDD 211. FIG. 16 is an example of a creasing specification method in the present embodiment, and shows a screen 1600 displayed on the operation unit 202 of the image forming apparatus 101. Here, a plurality of creasing positions and creasing directions can be designated, and the creasing position is designated by the distance from the center position with respect to the non-creased paper. In FIG. 16, creasing is specified on the surface at the position of −10.0 mm, the position of 0.0 mm, and the position of +10.0 mm from the center of the sheet. The creasing designation information designated in FIG. 16 is stored in the HDD 211 of the image forming apparatus 101. In S701, information stored in the HDD 211 is acquired.

  In step S <b> 706, the CPU 205 acquires a method for measuring a creasing position at the time of creasing. In the present embodiment, the process proceeds to S710 in order to measure the scoring position by the distance from the center of the sheet. In step S <b> 710, the CPU 205 determines the scoring position to be a position shifted from the designated position X acquired in step S <b> 701 by (A−B) * E / 2 toward the front end of the sheet. Here, the creasing designation position acquired in S701 is set to X, and the creasing frequency applied to the front end side in the paper transport direction from X is applied to the rear end side of the paper transport direction from A and X. Let B be the number of creasing. In step S708, the CPU 205 performs a creasing process at the determined creasing position. In step S709, the CPU 205 determines whether there is another scoring designation, and if there is, proceeds to step S701. On the other hand, if there is no other creasing designation, the creasing process is terminated.

<Position position>
Next, with reference to FIG. 9, the scoring position when the scoring position according to the present embodiment is measured from the center of the sheet will be described. As the scoring positions set by the user, the scoring position 901 is +10.0 mm from the center of the sheet, the scoring position 902 is 0.0 mm from the center of the sheet, and the scoring position 903 is -10.0 mm from the center of the sheet. . A case where the order of creasing is performed in the order of creasing position 902, creasing position 901, and creasing position 903 will be described.

  The first creasing can be performed without shifting to the designated position 902. In the second scoring, since the first scoring is performed on the paper rear end side from the second scoring position 901, the distance from the paper center to the scoring position 901 is +10.0 mm from the paper center. Instead of the position 905, the position 904 is 10.0-E / 2. Therefore, the second creasing is performed at the position 904. In the third creasing, since the first and second creasing are performed on the front side of the sheet from the position 903, the distance from the sheet center to the creasing position 903 is a position 907 which is -10.0 mm from the sheet center. There is no position 906 of -10.0 + Emm. Therefore, the second creasing is performed at the position 906.

  In FIG. 9, even if the creasing order can be controlled, the creasing position must be adjusted. However, by controlling the order of scoring so that the number of scoring times A on the front end side = the number of scoring times B on the rear end side among the plurality of times of scoring is increased, Adjustment can be minimized. For example, in FIG. 9, it is necessary to adjust the shift due to the shrinkage of the creasing position when creasing the positions 901 and 902 by performing creasing in the order of position 901, position 903, and position 902. Disappear.

  As described above, the sheet processing apparatus according to the present embodiment can obtain the same effects as those of the first embodiment even when the creasing position is measured by the distance from the center of the sheet. Specifically, according to the sheet processing apparatus according to the present embodiment, even when the sheet is shrunk due to the creasing, the creasing position desired by the user and the actual striation are performed when the creasing process is performed a plurality of times. It is possible to prevent displacement of the attachment position.

<Other embodiments>
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program. It is a process to be executed.

  101: Image forming device, 102: Image fixing device, 120, 121: Paper feeding device, 134: Paper discharging device, 151: Streaking device

Claims (14)

A sheet processing apparatus,
A creasing means for creasing the image-formed sheet;
A setting means for executing a creasing process by the creasing means, and setting a creasing position in the sheet;
When execution of the creasing process is set at a plurality of creasing positions in one sheet by the setting means, the first creasing position is set at the creasing position set by the setting means. The creasing process is executed by the means, and for the second and subsequent creasing processes, the creasing position set by the setting means is corrected based on the shrinkage of the sheet generated by the already completed creasing process. A sheet processing apparatus comprising: control means for executing creasing processing by the creasing means. Storage means for storing the amount of shrinkage when the creasing process is performed for each type of sheet;
The sheet processing apparatus according to claim 1, wherein the control unit corrects a creasing position set by the setting unit based on a shrinkage amount stored in the storage unit.   The sheet processing apparatus according to claim 2, wherein the setting unit sets one or more scoring positions for the sheet in accordance with a user input.   The sheet processing apparatus according to claim 3, wherein the setting unit sets a creasing position by a distance from a leading end of the sheet with respect to a conveyance direction of the sheet conveyed in the sheet processing apparatus. The control means includes
In the second and subsequent scoring processes, if the number of scoring processes that have already been completed is A and the amount of shrinkage stored in the storage means is E, the A * E value is set by the setting means. The sheet processing apparatus according to claim 4, wherein the attaching position is shifted toward the leading end side of the sheet.   The sheet processing apparatus according to claim 3, wherein the setting unit sets a creasing position by a distance from a center of the sheet with respect to a conveyance direction of the sheet conveyed in the sheet processing apparatus. The control means includes
In the second and subsequent creasing processes, A is the number of scoring processes that have already been completed on the leading edge side of the sheet relative to the creasing position of the target creasing process, and the sheet is located more than the scoring position of the target creasing process. Assuming that the number of creasing processes already completed on the rear end side is B and the contraction amount stored in the storage means is E, only the value of (A−B) * E / 2 is set by the setting means. The sheet processing apparatus according to claim 6, wherein a creasing position is shifted toward a leading end side of the sheet.   The sheet processing apparatus according to claim 1, further comprising means for setting a sheet type in response to a user input. An image forming apparatus,
Image forming means for forming an image on a sheet;
A creasing means for scoring a sheet imaged by the image forming means;
A setting means for executing a creasing process by the creasing means, and setting a creasing position in the sheet;
When execution of the creasing process is set at a plurality of creasing positions in one sheet by the setting means, the first creasing position is set at the creasing position set by the setting means. The creasing process is executed by the means, and for the second and subsequent creasing processes, the creasing position set by the setting means is corrected based on the shrinkage of the sheet generated by the already completed creasing process. An image forming apparatus comprising: control means for executing creasing processing by the creasing means. A control method for a sheet processing apparatus comprising a creasing means for scoring an image-formed sheet,
A setting step for setting a creasing position in the sheet, wherein the setting means executes creasing processing by the creasing means;
When the control means sets execution of the creasing process at a plurality of creasing positions in one sheet in the setting step, the creasing position set in the setting step is set for the first creasing position. The creasing process is executed by the creasing means in the second and subsequent creasing processes, and the creasing position set in the setting step is based on the shrinkage of the sheet generated by the already completed creasing process. And a control step of executing a creasing process by the creasing means at the corrected position. A control method for an image forming apparatus, comprising: an image forming unit that forms an image on a sheet; and a creasing unit that creates a streak on a sheet image-formed by the image forming unit,
A setting step for setting a creasing position in the sheet, wherein the setting means executes creasing processing by the creasing means;
When the control means sets execution of the creasing process at a plurality of creasing positions in one sheet in the setting step, the creasing position set in the setting step is set for the first creasing position. The creasing process is executed by the creasing means in the second and subsequent creasing processes, and the creasing position set in the setting step is based on the shrinkage of the sheet generated by the already completed creasing process. And a control step of executing a creasing process by the creasing means at the corrected position.   A computer-readable program for causing a computer to function as the sheet processing apparatus according to claim 1.   A computer-readable program for causing a computer to function as the image forming apparatus according to claim 9. An image forming apparatus for forming an image on a sheet;
An image forming system comprising: the sheet processing apparatus according to claim 1 connected to the image forming apparatus.

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