JP3834809B2 - Post-processing apparatus and image forming apparatus using the same - Google Patents

Post-processing apparatus and image forming apparatus using the same Download PDF

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Publication number
JP3834809B2
JP3834809B2 JP2001283110A JP2001283110A JP3834809B2 JP 3834809 B2 JP3834809 B2 JP 3834809B2 JP 2001283110 A JP2001283110 A JP 2001283110A JP 2001283110 A JP2001283110 A JP 2001283110A JP 3834809 B2 JP3834809 B2 JP 3834809B2
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Japan
Prior art keywords
sheet
processing
post
main
image forming
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JP2001283110A
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JP2003089471A (en
Inventor
龍一 佐藤
勉 小林
佳幸 高石
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富士ゼロックス株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a post-processing apparatus that performs post-processing of staples and the like and an image forming apparatus including the post-processing apparatus.
[0002]
[Prior art and problems to be solved by the invention]
In this type of post-processing apparatus, sheets sent from the main body of the image forming apparatus are once accumulated in an intermediate tray to create a sheet set, and the sheet set is stapled and discharged to a discharge tray. . In such a post-processing apparatus, there is a case where a waiting time is required for preparation of post-processing, for example, between sets. Conventionally, in order to secure such a waiting time, the image forming operation is skipped in accordance with the waiting time on the image forming apparatus main body side. However, the productivity of image formation is reduced by the time spent for skipping.
[0003]
Therefore, some proposals have been made in the past to improve the productivity in such a case. As one of them, there is a polymerization method in which sheets are put on standby by overlapping the sheets in accordance with the waiting time for post-processing. For example, in Japanese Patent Application Laid-Open No. 9-48545, the first sheet sent first is wound around a rotating body and waited, and the overlapping portion is arranged so as to overlap with the second sheet sent next. It is composed. In JP-A-10-25094, a bypass conveyance path is provided in parallel with the main conveyance path, the first sheet entering the main conveyance path is stopped by a stopper, and the second sheet is a bypass conveyance path. And a superposition part for superimposing the first sheet and the second sheet at the same timing is formed. Furthermore, in Japanese Patent Laid-Open No. 2000-327208, a conveyance roller that reversely waits for the first sheet is provided, and when the second sheet is conveyed, the conveyance roller is rotated forward to match the first sheet. A polymerization part for polymerizing the second sheet and the second sheet is disclosed.
[0004]
However, each of the above conventional examples pays attention only to the point of overlapping sheets, and lacks consideration for other factors. For example, in the above-described conventional example, the sheets are stacked at the leading end of the sheet, the sheets are aligned again at other portions of the sheet, for example, the trailing end of the sheet, and post-processing such as star pull is performed. When the sheet conveyance direction lengths of the second sheet and the subsequent second sheet are different, the sheets cannot be aligned in the intermediate tray. In addition, when a folding part that performs two-folding, Z-folding, or the like is provided on the upstream side of the above-described overlapping part, the sheet conveyance path on the upstream side of the overlapping part is blocked by the folded sheet or the folded sheets are stacked. There was a problem that a jam occurred in the sheet conveyance path or the overlapping portion.
[0005]
The present invention eliminates the above-mentioned conventional problems and can prevent the occurrence of sheet irregularities and jamming in advance without significantly reducing post-processing productivity, and an image forming apparatus using the same It is an issue to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the first feature of the present invention is that a superposition unit that can superimpose and convey passing sheets, and post-processing that performs post-processing on the sheet sent from the superposition unit And when the waiting time is required for the post-processing main body, the preceding sheet sent to the overlapping section and the subsequent sheet following the preceding sheet have the same length in the sheet conveyance direction. Sometimes, at least two sheets of the preceding sheet and the succeeding sheet are overlapped, and when the preceding sheet and the succeeding sheet are different in the sheet conveyance direction, the preceding sheet and the succeeding sheet are prohibited from being overlapped and passed one by one. In the post-processing device controlled to be. Therefore, since the preceding sheets and the succeeding sheets have the same length in the sheet conveyance direction, the sheets are stacked, so that the productivity is hardly lowered even if the post-processing main body has a waiting time. When the length in the sheet conveying direction is different, the preceding sheet and the succeeding sheet are passed one by one without being superposed, so that it is possible to prevent occurrence of a problem with sheet alignment in the post-processing main body. it can. When the waiting time of the post-processing main body is long, when the preceding sheet and the subsequent sheet have the same length in the sheet conveying direction, the overlapping sheets in the overlapping section can be three or more, and the preceding sheet When the length in the sheet conveyance direction differs between the preceding sheet and the subsequent sheet, the preceding sheet and the subsequent sheet need not be overlapped.For example, when the preceding sheet has the same length in the sheet conveying direction as the preceding sheet, Furthermore, the previous sheet can be overlaid.
[0007]
The second feature of the present invention is that a folding part that can fold and convey a sheet, a superposition part that can superimpose and convey the sheet sent from the folding part, and a superposition part A post-processing main body that performs post-processing on the fed sheet, and the superposition unit follows the preceding sheet sent to the superposition unit and the preceding sheet when the post-processing main body requires a waiting time. When both the succeeding sheet and the succeeding sheet are not subjected to the folding process by the folding part, at least two sheets of the preceding sheet and the succeeding sheet are overlapped, and at least one of the preceding sheet and the succeeding sheet is subjected to the folding process by the folding part. When this is done, the preceding sheet and the succeeding sheet are in a post-processing apparatus that is controlled so as to prohibit the overlapping and pass one by one. Therefore, when the folding process is not performed by the folding part, the preceding sheet and the succeeding sheet are overlapped, so that the productivity is rarely lowered even if the post-processing main body part has a waiting time. On the other hand, when the folding process is performed by the folding part, the preceding sheet and the succeeding sheet are passed one by one without being superposed, so that it is possible to prevent a jam from occurring in the sheet conveyance path or the superposing part.
[0008]
A third feature of the present invention includes an image forming apparatus main body and a post-processing apparatus connected to the image forming apparatus main body, and the post-processing apparatus is sent from the image forming apparatus main body. In an image forming apparatus comprising: a superposition unit that can superimpose and convey sheets; and a post-processing main body that performs post-processing on a sheet sent from the superposition unit. When the length of the preceding sheet and the succeeding sheet following the preceding sheet are the same in the sheet conveyance direction, the image forming interval before the preceding sheet is formed in the image forming apparatus main body at a predetermined interval, and the polymerization is performed. When at least two sheets of the preceding sheet and the succeeding sheet are overlapped in the section and the sheet conveying direction lengths of the preceding sheet and the succeeding sheet are different, the image before the preceding sheet is formed in the image forming apparatus main body. The formation interval spread than the predetermined distance, and in the image forming apparatus which controls so as to pass one by one prohibits superposed the preceding sheet and the subsequent sheet by the polymerization unit. Therefore, when the length of the preceding sheet and the subsequent sheet is the same in the sheet conveyance direction, image formation before the preceding sheet is formed at a predetermined interval on the image forming apparatus main body side, and the preceding sheet and the succeeding sheet are separated on the post-processing apparatus side. Since the superposition is performed in the superposition unit, there is little time waste between the image forming operation on the image forming apparatus main body side and the post-processing operation on the post-processing apparatus side, and productivity is hardly lowered. On the other hand, when the sheet conveyance direction lengths of the preceding sheet and the succeeding sheet are different, the image forming interval before forming the preceding sheet on the image forming apparatus main body side is widened. Since the superposition in the superposition unit is prohibited and the sheets are allowed to pass one by one, it is possible to prevent the occurrence of a jam in the sheet conveyance path or the superposition unit.
[0009]
A fourth feature of the present invention includes an image forming apparatus main body and a post-processing apparatus connected to the image forming apparatus main body, and the processing apparatus is sent from the image forming apparatus main body. Folding unit that can fold and convey the sheet, superposition unit that can superimpose and convey the sheet sent from this folding unit, and post-processing that performs post-processing on the sheet sent from this superposition unit In the image forming apparatus having the main body, when the waiting time is required for the post-processing main body, when both the preceding sheet and the succeeding sheet following the preceding sheet are not folded by the folding section. In the image forming apparatus main body, the image forming interval before the preceding sheet is formed is a predetermined interval, and at least the two sheets of the preceding sheet and the succeeding sheet are overlapped in the superposition unit, and the preceding sheet and the succeeding sheet are overlapped. When at least one of the sheet is folded by the folding unit, the interval before the preceding sheet is formed is widened in the image forming apparatus main body, and the overlapping of the preceding sheet and the succeeding sheet is prohibited in the overlapping unit. The image forming apparatus is controlled to pass one sheet at a time. Therefore, when the folding process is not performed by the folding unit, the image forming apparatus main body side performs image formation before forming the preceding sheet at a predetermined interval, and the post-processing apparatus side superimposes the preceding sheet and the succeeding sheet on the overlapping unit. Therefore, there is little time waste between the image forming operation on the image forming apparatus main body side and the post-processing operation on the post-processing apparatus side, and productivity is hardly reduced. On the other hand, when the folding process is performed by the folding part, the image forming interval before the preceding sheet formation on the image forming apparatus main body side is widened, and the overlapping part of the preceding sheet and the succeeding sheet is overlapped in the overlapping part of the post-processing apparatus. Since the alignment is prohibited and the sheets are allowed to pass one by one, it is possible to prevent the occurrence of a jam in the sheet conveyance path or the overlapping portion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, the image forming apparatus 10 includes an image forming apparatus main body 12 and a post-processing apparatus 14. In this embodiment, the post-treatment device 12 includes a folding unit 18 having a folding portion 16, and a post-processing main body unit 24 having a superposition portion 20 and a post-processing main body portion 22, and the image forming apparatus main body 12. The sheet discharged from the sheet passes through the folding section 16, the overlapping section 20, and the post-processing apparatus main body section 22 and is discharged to the non-sort tray 26 or the stacking tray 28.
[0011]
The image forming apparatus main body 12 has an image reading device 30 made of ADF or the like disposed at the upper portion thereof, and a three-stage paper feed tray 32 disposed at the lower portion thereof. A large number of sheets such as paper and OHP are stacked on the paper feed tray 32. The sheets are discharged to a paper feed path 36 by a paper feed roll 34, temporarily stopped by a registration roll 38, and timed. It is supplied to the image forming unit 40.
[0012]
The image forming unit 40 is composed of, for example, a xerographic engine. A latent image corresponding to image data is formed on a photoreceptor (not shown), the latent image is developed with toner, the toner is transferred to a sheet, and the fixing device 42 It is supposed to be fixed. The image forming unit 40 may be monochrome or may be color. In the case of color, for example, there are four photosensitive members, and development is performed with four colors. The recorded sheet on which the toner is fixed by the fixing device 42 is discharged to the post-processing device 14 by the recorded sheet discharge roll 44.
[0013]
However, when duplex printing is set, the sheet on which one side is fixed by the fixing device 42 is sent to the reversing device 48 by the double-sided switching gate 46, reversed by the reversing device 48, and returned to the paper feed path 36 again. Then, the image is sent to the image forming unit 40 and the other side is printed.
[0014]
2 and 3, the folding unit 16 includes a folding unit main conveyance path 54 provided between the folding unit receiving roll 50 and the folding unit discharge roll 52, and the folding unit main conveyance path 54. It has a two-fold conveyance path 56 that bypasses, and a Z-fold conveyance path 58 that branches from the two-fold conveyance path 56 and returns to the folding portion main conveyance path 54. The folding part main conveyance path 54 includes a two-fold stopper 60 and a first Z-fold stopper 62 provided in front of the two-fold stopper 60. The two-fold stopper 60 and the first Z-fold stopper 62 Is controlled by an actuator such as a solenoid (not shown) so as to open and close the folding portion main conveyance path 54. The two-fold conveyance path 56 includes a second Z-fold stopper 64 and a two-fold sheet conveyance roll 66. The second Z-fold stopper 64 is controlled by an actuator such as a solenoid (not shown) so as to open and close the two-fold conveyance path 56. When the folding process is not performed, the two-fold stopper 60 and the first Z-fold stopper 62 are opened, and the sheet is discharged to the post-processing main body unit 24 by the folding part discharge roll 52 through the folding part main conveyance path 54. The
[0015]
The first to third folding rolls 68, 70, and 72 are provided at the entrance branch portions of the folding portion main conveyance path 54, the two-fold conveyance path 56, and the Z-fold conveyance path 58. The first folding roll 68 and the second folding roll 70 are in contact with each other in parallel with the folding portion main transport path 54 to form a first nip portion 74, and the downstream side of the first nip portion 72 is 2 It is connected to the folding conveyance path 56. The distance between the above-described two-fold stopper 60 and the first nip portion 74 is set to one half of the length of the fed sheet. When the sent sheet is folded in two, the Z-fold stopper 62 is opened and the two-fold stopper 60 is closed. The fed sheet is stopped when the leading edge of the sheet hits the two-fold stopper 60 and further pushed. A nip is formed in front of the first nip portion 74, and the nip of this sheet is drawn into the first nip portion 74 and folded in two. The two-folded sheet passes through the two-fold conveyance path 56 by the two-fold sheet conveyance roll 66, joins the fold section main conveyance path 54, and is discharged to the post-processing main body unit 24 by the fold section discharge roll 52. . The second folding roll 70 and the third folding roll 72 are in contact with each other in parallel with the two-fold conveying path 56 to form a second nip portion 76, and the downstream side of the second nip portion 76 is It is connected to the Z-fold conveyance path 58. The distance between the first Z-fold stopper 62 and the first nip portion 72 described above is set to a quarter of the length of the fed sheet, and the second Z-fold stopper 64 and The distance from the second nip portion 76 is set to a quarter of the length of the sheet that is sent. As shown in FIGS. 2 and 3, when the fed sheet is Z-folded, the first Z-fold stopper 62 and the second Z-fold stopper 64 are closed, and the fed sheet is The tip is stopped by hitting the first Z-fold stopper 62, and further pushed in to form a nip before the first nip portion 74, and drawn into the first nip portion 74 to be 1/4 of the tip in the lower surface direction. The portion is folded, and this one-quarter portion is stopped by hitting the second Z-fold stopper 64, and further pushed in to form a nip in front of the second nip portion 76, and pulled into the second nip portion 76. Then, a half portion is folded in the upper surface direction and Z-folded. The Z-folded sheet passes through the Z-fold conveyance path 56, joins the fold-part main conveyance path 54, and is discharged to the post-processing main body unit 24 by the fold-part discharge roll 52. The two-fold stopper 60, the first Z-fold stopper 62, and the second Z-fold stopper 64 can be moved by a motor so as to be able to cope with changes in the length direction of each sheet. In another embodiment, the two-fold stopper 60 and the first Z-fold stopper 62 may be used as a single stopper, and may be moved according to the sheet size and folding method. Each stopper can be provided for each sheet length.
[0016]
The superimposing unit 20 is for superimposing sheets when waiting time is required in the post-processing main body unit 22 to be described later and securing the waiting time. As shown in FIGS. And a switchback conveyance path 80 separated from the polymerization part main conveyance path 78. The superposition unit main conveyance path 78 is provided with a first conveyance roll 82 and a second conveyance roll 84 with a branching portion of the switchback conveyance path 80 interposed therebetween, and the switchback conveyance path 80 has a third conveyance roll. 86 is provided. The second transport roll 84 and the third transport roll 86 can rotate forward and backward. Further, a sheet detection sensor 88 that detects the leading edge or the trailing edge of the sheet to be fed is provided on the upstream side of the first conveying roll 82. The overlapping portion switching gate 90 is provided at a branching portion between the overlapping portion main transfer path 78 and the switchback transfer path 80, and the first position shown in FIG. 4 or 6 and the second position shown in FIG. 5 or FIG. Switch to position. The superposition unit switching gate 90 permits sheet conveyance in the positive direction of the superposition unit main conveyance path 78 or the switchback conveyance path 80 in the first position, and the superposition unit main conveyance path in the second position. The sheet conveyance in the reverse direction 78 is prohibited, and only the sheet conveyance in the reverse direction of the switchback conveyance path 80 is allowed.
[0017]
In the superposition unit 20 configured as described above, when it is not necessary to overlap the sheets, the superposition unit switching gate 90 is in the first position as shown in FIG. The second conveyance roll 84 rotates forward, and the sheet passes through the superposition unit main conveyance path 78 and is sent to the post-processing main body unit 22. On the other hand, when it is necessary to superimpose sheets, the overlapping portion switching gate 90 is first in the first position, and the first conveyance roll 82 and the second conveyance roll 84 rotate forward to send the preceding sheet ( FIG. 4). After a certain period of time has elapsed since the trailing edge of the fed preceding sheet has been detected by the sheet detection sensor 88, that is, after the trailing edge of the preceding sheet has passed the overlapping portion switching gate 90, the second The conveyance roll 84 is stopped, the overlapping portion switching gate 90 is switched to the second position, the second conveyance roll 84 and the third conveyance roll 86 are rotated in reverse, and the preceding sheet is guided to the switchback conveyance path 80. After a predetermined time has elapsed, that is, after the leading edge of the preceding sheet has moved away from the second transport roll 84, the reverse rotation of the second transport roll 84 and the third transport roll 86 is stopped (FIG. 5). Thereafter, the overlapping portion switching gate 90 is switched to the first position, the succeeding sheet following the preceding sheet is fed by the first transport roll 82, the leading edge of the succeeding sheet is detected by the sheet detection sensor 88, and the leading edge of the succeeding sheet is detected. After a predetermined time has elapsed from the detection, the leading edge of the subsequent sheet is superimposed on the leading edge of the preceding sheet (FIG. 6). Thereafter, the second conveyance roll 84 and the third conveyance roll 86 rotate forward, and the superimposed preceding sheet and subsequent sheet are sent to the post-processing main body 22. When three or more sheets are to be stacked, the sheets that have been overlapped once may be returned to the switchback conveyance path 80 in a state where they are overlapped, and the next sheet may be overlapped.
[0018]
However, as shown in FIG. 7, the folded or Z-folded sheet closes the overlapping portion main conveyance path 78. For this reason, only one sheet that has been folded in two or Z is allowed to pass, and overlapping with other sheets is prohibited. That is, when both the preceding sheet and the succeeding sheet are not folded, the overlapping process is performed, and when at least one of the preceding sheet or the succeeding sheet is folded, the overlapping is prohibited. .
[0019]
The post-processing main body 22 has, for example, a first post-processing transport path 92 and a second post-processing transport path 94 that are separated from the superposition section main transport path 78, and this first post-processing transport path 94. 92 and the second post-processing conveyance path 94 are selected by a post-processing switching gate 96. The first post-processing conveyance path 92 is connected to the non-sort tray 26, and sheets are discharged from the first post-processing conveyance path 92 by a non-sort discharge roll 98. The non-sort tray 26 can be moved to the left and right, and constitutes a sorting device that moves at set breaks and sorts one set at a time.
[0020]
On the other hand, the second post-processing conveyance path 94 is connected to the intermediate tray 100. As shown in FIG. 8, around the intermediate tray 100, as shown in FIG. 8, the intermediate tray 100 rotates to receive sheets from the second post-processing conveyance path 94, and the sheets received in the intermediate tray 100. A post-processing sheet discharge roll 104 that rotates in contact with the lower surface and a paddle 106 that rotates in contact with the upper surface of the sheet are provided. A fence 108 is formed on the rear side of the intermediate tray 100, and the sheet entering the intermediate tray 100 rotates the post-processing sheet discharge roll 104 in the reverse direction and rotates the paddle 106 so that the rear end of the sheet is fenced. The rear end of the sheet is aligned. The tamper 110 abuts on the side edge of the sheet so that the side edge of the sheet is aligned. The set of sheets thus aligned is subjected to a stapling process by, for example, a stapler 112 provided at the rear end of the intermediate tray 100. In the stapler 112, it is possible to select one-point binding or two-point binding. The sheet bundle subjected to the stapling process is sandwiched between post-processing sheet discharge rolls 104 and discharged to the stacking tray 28.
[0021]
However, as shown in FIG. 8, in the superposition unit 20 described above, the preceding sheet and the succeeding sheet are overlapped at the leading end, and the intermediate tray 100 is aligned at the trailing end of the sheet. If the sheets are overlapped when the length in the sheet conveying direction is different, one of the preceding sheet and the succeeding sheet is not in contact with the paddle 106, so that the sheets cannot be aligned. In this case, the overlapping process in the superposition unit 20 is prohibited. . That is, when the preceding sheet and the subsequent sheet have the same length in the sheet conveying direction, the overlapping process is possible, and when the preceding sheet and the subsequent sheet have different lengths in the sheet conveying direction, the overlapping process is prohibited. is there.
[0022]
In the description of the above embodiment, the post-processing main body 22 is provided with the sorting device 26 and the stapler 112. However, as another post-processing device, a puncher for punching holes in a sheet, a sheet bundle The apparatus includes a gluing bookbinding apparatus that binds and glues the side edges and a saddle stitch bookbinding apparatus that binds at the center of the sheet.
[0023]
FIG. 9 shows an example of a control circuit of the image forming apparatus in this embodiment. The control circuit 114 of the image forming apparatus main body is configured by connecting an image forming apparatus main body driving circuit 116, a CPU 118, a ROM 120, a RAM 122, a setting information input circuit 124, and a communication interface 126 by a bus. The image forming apparatus main body is controlled by the CPU 118 in accordance with a program written in the ROM 120. The setting information input circuit 124 receives instruction contents such as the number of sheet sets to be formed, the number of sheets for each set, and the post-processing contents for each set from an instruction panel provided on the external computer or the image forming apparatus main body. The On the other hand, the control circuit 128 of the post-processing device is configured by connecting the post-processing device drive circuit 130, the CPU 132, the ROM 134, the RAM 136, and the communication interface 138 with a bus. The post-processing device is controlled by the CPU 132 according to a program written in the ROM 134. The communication interface 126 of the image forming apparatus main body and the communication interface 138 of the post-processing apparatus are connected via a communication cable 140 so as to transmit information from the image forming apparatus main body to the post-processing apparatus.
[0024]
The RAM of the control circuit 114 of the image forming apparatus main body is provided with a superposition number table 142 shown in FIG. The number of superimposed sheets is set according to the post-processing content of the post-processing main body, and corresponds to the time required for preparation of post-processing between sets. For example, in the case of stapling, the number of overlaps is 2 for two-point binding, 3 for two-point binding, 3 for punching processing, 2 for sorting processing, 5 for gluing binding processing, and saddle stitching processing. In the case of 4.
[0025]
Next, the operation of this embodiment will be described.
When setting information is input to the setting information input circuit 124 and, for example, a start button provided on the image forming apparatus main body 12 is pressed, an image forming operation of the image forming apparatus main body 12 is started. That is, sheets are successively supplied from the sheet feed tray 32 to the sheet feed path 36, and a toner image corresponding to the image data is transferred to the sheet by the image forming unit 40 and fixed by the fixing device 42. Information input to the image forming apparatus main body 12 is transmitted to the control circuit 128 of the post-processing apparatus 14 via the communication cable 140. The post-processing device 14 performs post-processing on the sheet sent based on the transmitted information. That is, if there is a folding instruction, the folding unit 16 performs two-folding or Z-folding. If there is a post-processing instruction, the post-processing main body unit 22 performs post-processing such as stapling, and the non-sort tray 26 or stacking tray. The post-processing is performed for each set which is a bundle of sheets.
[0026]
Processing between sets will be described with reference to FIGS.
First, in the image forming apparatus main body, sheet information constituting the first set is input in step S10. For printing, it can be recognized based on external setting information, and for copying, if the first image forming operation is performed, the size and direction of all sheets, the contents of post-processing, and the sheet order (what number It is possible to recognize whether the length in the sheet conveyance direction has changed or what number the folding process has been executed. Next, in step S12, the contents of the superimposed number table 142 shown in FIG. 10 are read. Next, in step S14, the staying number is calculated. The number of staying is the number of staying in the polymerization unit 20. If the number of stacked sheets does not include a set with different sheet transport lengths for the preceding sheet and the succeeding sheet, or if the set for folding one of the preceding sheet and the succeeding sheet is not included The number of sheets is the number obtained by subtracting 1 from the number of sheets to be overlapped. If the number of overlaps includes a set in which the sheet transport length of the preceding sheet and the succeeding sheet is different, either the preceding sheet or the succeeding sheet is folded. When a group to be processed is included, the number of sheets before the sheet conveyance length is different or the number of sheets before the folding process is performed. Next, in step S16, the number of staying sheets is notified to the post-processing apparatus side, and in the next step S18, skip processing is executed, and the processing ends. In the skip process, the image forming operation is skipped by the number of sheets obtained by subtracting the staying sheet number + 1 from the overlapped sheet number.
[0027]
On the other hand, in the post-processing apparatus, in S20, the staying number sent from the image forming apparatus main body is inputted, and in step S22, the superposition process is executed by staying in the superposition unit by the staying number, and the process is finished. . When the staying number is 1 or more, the staying sheet and the succeeding sheet are overlapped and conveyed to the post-processing main body.
[0028]
FIG. 13 shows an example in the case of one-point binding. In this case, the number of superimposed images is 2. Here, A4L indicates a sheet of A4 size, and the sides before and after the sheet conveyance direction are set in the longitudinal direction, and A3S indicates a sheet of A3 size and the sides before and after the sheet conveyance direction are set in the short direction. Show. As shown in FIG. 13A, when the first and second sheets in the second set are A4L, sets and folding processes having different lengths in the sheet conveying direction are performed between the two stacked sheets. Since there is no set, the number of stays is 1, the first sheet stays in the overlapping portion, and is superposed on the second sheet, and the skip process is not performed, and the first and second sheets are left as they are. Image processing is performed on the numbered sheet. As shown in FIG. 13B, when the first number in the second set is A4L and the second number is A3S, there is a set having different lengths in the sheet conveyance direction, so the staying number is 0. The overlay process is not performed. On the other hand, the skip processing for one sheet is performed in the image forming apparatus main body. As shown in FIG. 13 (c), when the first set in the second set is A3S Z-fold and the second set is A4L, the number of stays is similarly 0, and the stacking process is not performed. Minute skip processing is performed.
[0029]
FIG. 14 shows an example of saddle stitch binding. In this case, the number of superimposed images is 4. As shown in FIG. 14A, in the case of A4L from No. 1 to No. 5 in the second set, the staying number is 4, and the No. 1 to No. 3 sheets are retained and the No. 4 sheet is stacked. Skip processing is not performed. As shown in FIG. 14B, the sheets from No. 1 to No. 3 are A4L, but when the No. 4 sheet is A3S, the staying number is 2, and the No. 1 and No. 2 sheets are retained. Overlay the third sheet. In this case, the required number of overlapped sheets is insufficient for one sheet, so the image processing apparatus main body skips one sheet. The skip position may be anywhere between the number of overlapping sheets. As shown in FIG. 14C, when the first sheet is A3S and the second sheet is A4L, the number of staying sheets is 0, and the overlapping process is not performed, but skipping is performed for three sheets. As shown in FIG. 14 (d), the sheets from No. 1 to No. 3 are A4L, but when the No. 4 sheet is A3S folded twice, the number of stays is 2, and the No. 1 and No. 2 sheets The sheet is retained, the third sheet is overlapped, and one sheet is skipped. As shown in FIG. 14E, when the first sheet is folded in A3S and the second sheet is A4L, the staying number is 0, and the overlapping process is not performed, but skipping for three sheets is performed. Is.
[0030]
【The invention's effect】
As described above, according to the present invention, when the length in the sheet conveying direction is different or when the folding process is performed, the superposition is prohibited, so that the deterioration of the sheet alignment and the occurrence of jamming are prevented in advance. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view showing an image forming apparatus according to an embodiment of the present invention.
FIG. 2 is a side view showing a folding part used in the post-processing apparatus according to the embodiment of the present invention, and shows a state in which the first sheet quarter is folded when Z-folding is performed.
FIG. 3 is a side view showing a folding portion used in the post-processing apparatus according to the embodiment of the present invention, and shows a state in which the next half sheet is folded when Z-folding is performed.
FIG. 4 is a side view showing a superposition unit used in a post-processing apparatus according to an embodiment of the present invention, showing a state in which a preceding sheet is conveyed.
FIG. 5 is a side view showing a superposition unit used in a post-processing apparatus according to an embodiment of the present invention, and shows a state in which a preceding sheet is conveyed to a switchback conveyance path.
FIG. 6 is a side view showing a superposition unit used in the post-processing apparatus according to the embodiment of the present invention, and shows a state in which a preceding sheet and a succeeding sheet are superposed.
FIG. 7 is a side view showing a superposition unit used in the post-processing apparatus according to the embodiment of the present invention, and shows a state where a Z-folded sheet is conveyed.
FIG. 8 is a side view showing the vicinity of the intermediate tray of the post-processing main body used in the post-processing apparatus according to the embodiment of the present invention, and shows a problem state when the preceding sheet and the succeeding sheet are conveyed. Yes.
FIG. 9 is a circuit diagram showing a control circuit used in the image forming apparatus according to the embodiment of the present invention.
FIG. 10 is a chart showing an overlay table stored in the control circuit of the image forming apparatus main body according to the embodiment of the present invention.
FIG. 11 is a flowchart illustrating inter-set processing of the image forming apparatus main body according to the embodiment of the present invention.
FIG. 12 is a flowchart showing inter-set processing of the post-processing apparatus according to the embodiment of the present invention.
FIG. 13 is an explanatory diagram illustrating the flow of a sheet when binding is performed at one place by the image forming apparatus according to the embodiment of the invention.
FIG. 14 is an explanatory diagram illustrating a sheet flow when saddle stitching is performed by the image forming apparatus according to the embodiment of the invention.
[Explanation of symbols]
10 Image forming apparatus
12 Image forming device body
14 Post-processing equipment
16 Folding part
20 Superposition part
22 Post-processing body
26 Non-sort tray
28 Loading tray
40 image forming unit
54 Folding section main conveyance path
56 Two-fold conveyance path
58 Z-fold conveyance path
60 2-fold stopper
62 First Z-fold stopper
64 Second Z-fold stopper
68 First folding roll
70 Second folding roll
72 Third folding roll
78 Superposition part main transport path
80 Switchback transport path
90 Superposition part switching gate
100 Intermediate tray
108 fence
106 paddle
112 stapler

Claims (6)

  1. A superposition unit that can superimpose and convey the passing sheets, and a post-processing main body that performs post-processing on the sheet sent from the superposition unit, and the superposition unit waits in the post-processing main body. When time is required, when the length of the preceding sheet sent to the superposition unit and the succeeding sheet following the preceding sheet are the same, the two sheets of the preceding sheet and the succeeding sheet are overlapped at least. A post-processing apparatus, wherein when a length of a sheet and a succeeding sheet is different from each other in a sheet conveying direction, the post-processing apparatus is controlled to prohibit the overlapping of the preceding sheet and the succeeding sheet and to pass one by one.
  2. Folding part that can fold and convey the sheet, superposition part that can superimpose and convey the sheet sent from this folding part, and post-processing body that performs post-processing on the sheet sent from this superposition part And when the waiting time is required for the post-processing main body, both the preceding sheet sent to the overlapping section and the succeeding sheet following the preceding sheet are folded by the folding section. When the sheet is not applied, at least two sheets of the preceding sheet and the succeeding sheet are overlapped, and when at least one of the preceding sheet and the succeeding sheet is folded by the folding portion, the preceding sheet and the succeeding sheet are overlapped. A post-processing device that is controlled so as to pass the sheets one by one while prohibiting the alignment.
  3. The post-processing apparatus according to claim 1, wherein the post-processing main body includes at least one selected from a stapler, a puncher, a sorting apparatus, a glue binding apparatus, and a saddle stitching apparatus.
  4. An image forming apparatus main body and a post-processing apparatus connected to the image forming apparatus main body, and the post-processing apparatus can superimpose and convey sheets sent from the image forming apparatus main body And an image forming apparatus having a post-processing main body that performs post-processing on the sheet sent from the superposition unit, when the post-processing main body requires a waiting time, the preceding sheet and the preceding sheet When the length of the succeeding subsequent sheet is the same in the sheet conveying direction, the image forming apparatus main body performs an image forming interval before forming the preceding sheet at a predetermined interval, and at least two sheets of the preceding sheet and the succeeding sheet are formed in the overlapping unit When the sheet conveyance direction lengths of the preceding sheet and the succeeding sheet are different from each other, the image forming interval before forming the preceding sheet in the image forming apparatus main body is wider than the predetermined interval. One the polymerization unit with the preceding sheet and the image forming apparatus and controlling so as to pass one by one prohibits superposed and subsequent sheet.
  5. An image forming apparatus main body, and a post-processing apparatus connected to the image forming apparatus main body, the processing apparatus folding a sheet sent from the image forming apparatus main body, In an image forming apparatus including a superposition unit that can superimpose and convey sheets sent from the folding unit, and a post-processing main body that performs post-processing on the sheet sent from the superposition unit, When the waiting time is required for the post-processing main body, when both the preceding sheet and the succeeding sheet following the preceding sheet are not folded by the folding portion, the image forming apparatus main body before the preceding sheet is formed. An image forming interval is performed at a predetermined interval, and at least two sheets of a preceding sheet and a succeeding sheet are overlapped at the overlapping portion, and at least one of the preceding sheet and the succeeding sheet is caused by the folding portion. When the folding process is performed, the image forming apparatus main body widens the interval before the preceding sheet is formed, and the superposition unit controls the preceding sheet and the succeeding sheet to be prohibited from being overlapped and passed one by one. An image forming apparatus.
  6. The image forming apparatus according to claim 4, wherein the post-processing main body includes at least one selected from a stapler, a puncher, a sorting device, a gluing bookbinding device, and a saddle stitching device.
JP2001283110A 2001-09-18 2001-09-18 Post-processing apparatus and image forming apparatus using the same Expired - Fee Related JP3834809B2 (en)

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Application Number Priority Date Filing Date Title
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