JP2007168958A - Image forming system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of being stagnant since a postprocessing process is interrupted, useless waiting time and paper replenishing operation are required and the other image forming processing cannot be performed, when paper runs out of a paper feeding tray in the middle of binding and forming a book by a postprocessor. <P>SOLUTION: This image forming system is provided for supplying the paper from a body paper feeding tray, when the paper coincident with a paper size and coincident with at least one of a paper kind, weighing capacity and a color exists in the body paper feeding tray, when there is no paper in a postprocessing paper feeding tray, and supplying recording paper from a postprocessing tray, when there in no paper in the body paper feeding tray and there is the same kind of paper in the postprocessing paper feeding tray. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image forming system in which an inter sheet is inserted in the middle of a sheet conveyed from an image forming apparatus. In particular, the present invention relates to a paper feed tray selection method when performing interleaf using an inter sheet.

  2. Description of the Related Art In recent years, a paper post-processing apparatus and an image forming apparatus that form a booklet by bundling paper on which an image is recorded by an image forming apparatus such as a copying machine, a printer, or a multifunction machine thereof, and performing binding processing in the paper post-processing apparatus An image forming system is provided.

Furthermore, some post-processing devices are called post-processing devices that are printed on paper such as coated paper to form a booklet using cover paper, and inter-sheets are used to distinguish the contents in the middle of the booklet. Also provided are post-processing devices that use paper of different types and types, paper basis weight (g / m ² ), and color.

  However, a large amount of paper is used to form a booklet, but during the bookbinding process in the post-processing device, if the paper runs out of the paper feed tray, the post-processing process is interrupted, and wasteful waiting time and There arises a problem that a paper replenishing operation is required or other image forming processing cannot be performed and the paper is stagnated.

  Further, in a post-processing apparatus that uses a cover sheet to form a booklet, the problem arises that the post-processing step must be interrupted when the cover sheet runs out.

  For example, in Japanese Patent Application Laid-Open No. H11-260260, when a desired sheet is used up, there is a means for cutting and using the doubled sheet if there is a doubled sheet, particularly printing two sheets on the doubled sheet. And a control method of cutting with a post-processing device is described.

Japanese Patent Laid-Open No. 2003-228561 includes a post-processing apparatus that includes a paper feed tray that stores cover paper and a plurality of paper feeding units that feed the cover paper, and stores cover paper of the same size in a plurality of stages of paper feed trays. In this case, when the remaining paper amount detecting means of one paper feeding device detects that there is no cover paper in the paper feeding tray, the control means operates the paper feeding means of the other paper feeding device to It is described that the sheet feeding operation of the cover sheet by the other sheet feeding device is started following the sheet feeding operation of the sheet feeding device.
JP 2005-169934 A JP 2003-233228 A

  However, neither Patent Document 1 nor Patent Document 2 describes how to solve the problem when the inter sheet disappears.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems in a conventional sheet post-processing apparatus and to provide an image forming system including a post-processing apparatus that achieves the efficiency of intersheet feeding. .

The above object can be achieved by the following constitution.
1. An image forming apparatus having a plurality of stages of main body paper feed trays for storing paper, paper remaining amount detection means for detecting the remaining amount of paper, and main body paper feed means for supplying paper;
A sheet post-processing apparatus that sequentially feeds recording sheets discharged from the image forming apparatus to the stacking unit and performs post-processing by a post-processing unit;
The paper post-processing device is provided with a plurality of stages of post-processing paper feed trays for storing paper, post-processing paper remaining amount detecting means for detecting the remaining amount of paper, and post-processing paper feeding means for supplying paper.
Image formation having switching control means for performing control for switching to supply paper from either one of the post-processing paper feed tray or the main body paper feed tray when the paper runs out In the system,
The switching control unit selects the paper feed tray when there is a paper having the same size in the paper feed tray and there is a condition that at least one of the paper type, the basis weight, and the color matches. Switch control to
If there is no paper in any of the plurality of main body paper feed trays, a paper feed tray corresponding to the matching condition is selected from both the main body paper feed tray and the post-processing paper feed tray. ,
When there is no paper in any of the plurality of post-processing paper feed trays, control is performed to select a paper feed tray corresponding to the matching condition from the post-processing paper feed trays. Image forming system.
2. In the case where a fixing press release mechanism is provided in the fixing unit included in the image forming apparatus, the switching control unit is configured to detect the absence of paper in either the main body paper feed tray or the post-processing paper feed tray. 2. The image forming system according to 1, wherein control is performed to select a paper feed tray corresponding to the matching condition from both a paper feed tray and the post-processing paper feed tray.
3. In the inter sheet mode in which an inter sheet is inserted while the sheets discharged from the image forming apparatus are sequentially sent to the stacking unit, at least one of the plurality of main body feed trays includes 3. The image forming system according to 1 or 2, further comprising an inter sheet.
4). The image forming system according to any one of claims 1 to 3, wherein the plurality of post-processing paper feed trays include at least one of an inter sheet and a cover paper.
5. 5. The image forming system according to any one of 1 to 4, further comprising a control unit capable of changing a condition in which a paper type, a basis weight, and a color match.

According to the first aspect of the present invention, when there is no paper in the post-processing paper feed tray, the paper having the same paper size and at least one of the paper type, the basis weight, and the color matches. If it is in the main feed tray, feed paper from the main feed tray,
When there is no paper in the main body paper feed tray and there is the same type of paper in the post-processing paper feed tray, the recording paper is supplied from the post-processing tray. However, the sheet fed from the main body feed tray passes through the fixing means of the image forming apparatus and is controlled not to be fed when being heated and fixed.

  According to the second aspect of the present invention, the switching control is performed when the paper is fed from the main body feed tray, and is not performed when the paper is fed from the post-processing feed tray. The sheet to be printed is not conveyed to the main body side.

  According to the third and fourth aspects of the present invention, at least one of the plurality of main body paper feed trays has the same type of paper as the post-processing paper feed tray, so that there is no paper in the post-processing paper feed tray. You can use paper from the main unit's paper feed tray.

  Next, a sheet post-processing apparatus (hereinafter referred to as a post-processing apparatus) and an image forming apparatus including the post-processing apparatus according to the present invention will be described with reference to the drawings.

[Image forming system]
FIG. 1 is an overall configuration diagram of an image forming system including an image forming apparatus A, an image reading apparatus B, and a post-processing apparatus FS.

[Image forming apparatus]
The image forming apparatus A includes a charging unit 2, an image exposure unit (image input unit) 3, a developing unit 4, a transfer unit 5A, a charge removing unit 5B, a separation claw 5C, and a cleaning unit 5D around the rotating image carrier 1. Is provided.

  The image of the document placed on the document table is read by the optical system of the image reading device B. The signal photoelectrically converted by the CCD image sensor is subjected to analog processing, A / D conversion, shading correction, image compression processing, and the like in the image processing unit 6 and then sent to the image exposure means 3.

  The charging means 2 uniformly charges the surface of the image carrier 1. In the image exposure means 3, the output light from the semiconductor laser is exposed and scanned on the image carrier 1 of the image forming unit based on the image data read from the original to form a latent image. The latent image is reversely developed by the developing means 4 to form a toner image on the image carrier 1.

  On the other hand, the paper S fed from the main body paper feed tray 7A is sent to the transfer position. The toner image is transferred onto the paper S by the transfer means 5A at the transfer position. Thereafter, the charge on the back surface of the sheet S is erased by the charge removing unit 5B, separated from the photosensitive member 1 by the separation claw 5C, conveyed by the intermediate conveying unit 7B, and subsequently heated and fixed by the fixing unit 8, and from the sheet discharging unit 7C. Discharged.

  The main body paper feed tray has a main body paper feed tray 7F and a main body paper feed tray 7G in addition to 7A, and the paper S fed from each tray is sent to the transfer position.

  When image formation is performed on both sides of the sheet S, the sheet S heated and fixed by the fixing unit 8 is branched from the normal sheet discharge path by the conveyance path switching plate 7D, and is switched back by the reverse conveyance unit 7E. After inversion, the paper is discharged out of the apparatus by the paper discharge unit 7C. The paper S discharged from the paper discharge unit 7C is sent to the receiving unit 11 of the post-processing device FS.

  Further, a fixing roller having a heater and a driving roller for rotating the fixing roller are pressure-bonded by an elastic member such as a spring, and the sheet developed with toner is sandwiched and heated and fixed to the fixing unit 8. In order to efficiently heat the heat, a fixing / crimping release mechanism is provided so as not to be hot-pressed at times other than the fixing operation.

  Also, when sending cover sheets or intersheets from the main unit feed tray to the post-processing device, it is necessary not to perform thermocompression bonding to prevent paper curl and wrinkles. Used to release the crimp and send the paper to the post-processing device.

  On the other hand, the developer remaining on the surface of the image carrier 1 after the image processing is removed downstream of the separation claw 5C by the cleaning unit 5D to prepare for the next image formation.

  On the upper part of the image forming apparatus A, an operation unit 9 for selecting and setting an image forming mode and a sheet post-processing mode is disposed.

  On the upper part of the image forming apparatus A, an image reading apparatus B provided with an automatic document feeder of a document moving type reading system is installed.

[Post-processing equipment]
In the post-processing apparatus FS, a post-processing paper feed tray 20A, a post-processing paper feed tray 20B, a fixed paper discharge tray 30, and a paper discharge means 60 are arranged at the upper stage in the figure, and a binding means (staple means) 70 is arranged at the lower stage. It is arranged on an inclined surface. In addition, on the left side of the post-processing device FS in the figure, an elevating / discharging tray 91 on which a bundle of bound sheets is stacked is disposed.

  The post-processing device FS is installed with its position and height adjusted so that the receiving portion 11 for the sheet S carried out from the image forming device A matches the paper discharge portion 7C of the image forming device A.

  The receiving unit 11 includes sheets S subjected to image formation processing from the image forming apparatus A, cover sheets (cover sheets) K1 supplied from the post-processing paper feed tray 20A, and interfaces supplied from the post-processing paper feed tray 20B. Sheet K2 is introduced. In the vicinity of the receiving unit 11, a sensor PS for detecting passage of the leading edge of the paper S is disposed.

Cover Sheet Paper Feeding Device The post-processing sheet feeding tray 20A includes sheet feeding means 22A that feeds the cover sheet K1. The post-processing paper feed tray 20B includes a paper feed unit 22B that sends out the inter-sheet inter-sheet K2.

  The paper feed means 22A includes a paper size detection means 26A for detecting the size of the cover paper K1 stored in the post-processing paper feed tray 20A, and the remaining amount of the cover paper K1 stored in the post-processing paper feed tray 20A. 27 A of paper remaining amount detection means 27A which detects absence is arrange | positioned. Similarly, a paper size detection unit 26B and a remaining paper amount detection unit 27B are arranged in the paper supply unit 22B.

Each of the post-processing paper feed trays 20A and 20B can accommodate approximately 300 cover sheets K1 (or K2) made of 64 g / m ² plain paper (commonly called 55 kg paper). In the case of a cover sheet K1 (or K2) made of 128 g / m ² thick letters (commonly called 110 kg paper), about 200 sheets can be accommodated.

  The cover sheet K1 accommodated in the post-processing sheet feeding tray 20A is separated and fed by the sheet feeding unit 22A, is sandwiched between the transport rollers 23, 24, and 25 and is introduced into the receiving unit 11. Further, the intersheet K2 accommodated in the post-processing paper feed tray 20B is separated and fed by the paper feed means 22B, is sandwiched between the transport rollers 24 and 25, and is introduced into the receiving unit 11.

  The post-processing device FS superimposes the cover paper K fed from the post-processing paper feed tray 20A and the post-processing paper feed tray 20B on the paper S discharged from the image forming apparatus A, and performs binding processing. Switching between the online mode for performing the folding process and the offline mode for storing and feeding the paper S in the post-processing paper feed tray 20A and the post-processing paper feed tray 20B and performing the binding process, the folding process, etc. It can be done as much as possible.

Sheet branching means G1 and G2 are switching gates for switching sheet conveyance. The switching gates G1 and G2 are driven by a solenoid (not shown) to any one of three paper transport paths, that is, the first transport path 301 for upper sheet discharge, the second transport path 302 for the middle stage, and the third transport path 303 for the lower stage. Branch selectively.

Simple discharge When this sheet conveyance is set, the switching gate G1 blocks the second conveyance path 302 and the third conveyance path 303 and opens only the first conveyance path 301.

  The sheet S passing through the first conveyance path 301 is sandwiched and raised by the conveyance roller 31, is discharged by the discharge roller 32, is placed on the fixed sheet discharge table 30, and is sequentially stacked.

  A maximum of about 200 sheets S can be loaded on the fixed sheet discharge tray 30.

Binding processing FIG. 2 is a cross-sectional view of the binding means 70.

  When the binding process is set in the operation unit 9, the image-formed sheet S that has been subjected to the image forming process in the image forming apparatus A and sent to the receiving unit 11 of the post-processing apparatus FS is below the switching gate G2. It is sent to the third conveyance path 303 and is nipped by the conveyance roller 12 and conveyed downward.

  When the first paper S having a size larger than A4 size and B5 size is transported in the third transport path 303, the solenoid SD is driven, and the paper S passes through the paper passage 13A on the left side of the switching gate G3 in the drawing. Then, it is sandwiched between the transport rollers 14 and transported downward. The sheet S is further sandwiched and sent out by the downstream registration rollers 15, discharged to an upper space of the intermediate stacker 71 that is inclined, and contacts the upper surface of the intermediate stacker 71 or the sheet S stacked on the intermediate stacker 71. It is conveyed diagonally upward.

  After the trailing end of the sheet S in the advancing direction is discharged from the holding position of the conveying roller 14, the sheet S turns downward due to its own weight, is conveyed on the inclined surface of the intermediate stacker 71, and is bound in the vicinity of the binding means 70. The rear end portion of the sheet S comes into contact with the sheet abutting surface of the movable stopper member 72 (hereinafter referred to as an end binding stopper) and stops.

  In order to improve the copy productivity by efficiently transporting a small size paper S such as A4, B5 size, etc. in the third transport path 303, the movable switching gate G3 and the switching gate G3 on the left side of the figure are shown. A paper path 13B parallel to the paper path 13A is provided.

  When the solenoid SD connected to the switching gate G3 is driven, the sheet passing path 13A is closed and the sheet passing path 13B is opened.

  The leading end portion of the first small-size sheet S sent out from the conveying roller 12 passes through the sheet passing path 13B and comes into contact with the circumferential surface of the registration roller 15 in the rotation stopped state to stop.

  Next, the energization of the solenoid SD is turned off, the tip end portion of the switching gate G3 is swung clockwise, the sheet passing path 13B is closed, and the sheet passing path 13A is opened. The leading end of the second sheet S sent out from the transport roller 12 passes through the sheet passing path 13A and comes into contact with the peripheral surface of the registration roller 15 in the rotation stopped state to stop. Accordingly, the leading end portions of the first sheet S and the second sheet S are overlapped and stopped near the position where the registration roller 15 is sandwiched, and a standby state is entered.

  At a predetermined timing, the registration roller 15 is driven and rotated so that the two sheets S are sandwiched and simultaneously conveyed and discharged onto the intermediate stacker 71. After the third sheet, the registration rollers 15 discharge the sheets S one by one.

  Reference numeral 73 denotes a pair of width alignment members that are movably provided on both side surfaces of the intermediate stacker 71. The width aligning member 73 is movable in a direction perpendicular to the paper transport direction. When the paper S is received on the intermediate stacker 71, the width aligning member 73 is opened wider than the paper width, transported on the intermediate stacker 71, and edge-bound. When contacting the stopper 72 and stopping, the side edges of the paper S in the width direction are tapped to perform the width alignment (width alignment) of the paper S. When a predetermined number of sheets S are stacked and aligned on the intermediate stacker 71 at this stop position, the binding means 70 performs a binding process, and the sheets S are bound.

  A cutout portion is formed in a part of the sheet stacking surface of the intermediate stacker 71, and a plurality of discharge belts 74C wound around the drive pulley 74A and the driven pulley 74B are driven to rotate. A discharge claw 74D is integrally formed on a part of the discharge belt 74C, and the tip portion of the discharge belt 74C draws an elliptical locus as shown by a one-dot chain line in the drawing. The bound sheet S is held on the trailing edge of the sheet S by the discharge claw 74D of the discharge belt 74C, placed on the discharge belt 74C, and slid on the mounting surface of the intermediate stacker 71 obliquely upward. The paper is pushed up and proceeds to the nipping position of the discharge roller 61 of the paper discharge means 60. The sheet S sandwiched between the rotating discharge rollers 61 is discharged and stacked on the lifting / lowering discharge table 91.

  The lifting / lowering tray 91 is configured to descend sequentially when a large number of sheets S are discharged, and can accommodate a maximum of about 3000 sheets (A4, B5) of sheets S.

End Binding Processing FIG. 3A is a plan view of the binding means 70 that performs the flat binding processing by hitting the binding needles SP at two central sorting positions in the vicinity of the side edge a of the sheet bundle Sa, and FIG. FIG. 5 is a plan view of a binding means 70 that staples a binding needle SP at one location in the vicinity of a corner portion of the sheet bundle Sa and performs an end binding process.

  The binding means 70 is configured in a two-part structure of a needle-striking mechanism 70A and a needle-receiving mechanism 70B, and forms a paper passage path 75 through which the paper S can pass.

  Two sets of binding means 70 are arranged in a direction orthogonal to the paper conveyance direction, and are moved in a direction orthogonal to the paper conveyance direction by a driving means (not shown) to form a sheet bundle consisting of cover paper K and all pages of paper S. The binding needles SP are hit at two locations in the center of Sa in the paper width direction. The binding means 70 is supported so as to be able to swing and rotate, and strikes the binding needle SP at one corner portion of the sheet bundle Sa corresponding to the sheet size.

[Cover paper feed control]
FIG. 4 is a block diagram illustrating control of the image forming apparatus A and the post-processing apparatus FS.

  The image exposure unit 3, the image forming units (2, 4, 5A, 5B, 5C, 5D) and the image processing unit 6 of the image forming apparatus A are based on the signals selected and set by the operation unit 9, and the main control unit 100 Controlled by

  The communication unit 101 of the main control unit 100 of the image forming apparatus A and the communication unit 201 of the post-processing control unit 200 of the post-processing device FS are electrically connected, and control signals are exchanged.

  The selection unit of the operation unit 9 sets the post-processing device FS post-processing paper feed tray 20A, post-processing paper feed tray 20B, paper feeding by the binding unit 70 and edge binding processing.

  With this setting, the main control unit 100 sends a control signal to the post-processing device FS via the communication unit 101. The control signal is transmitted to the post-processing control unit 200 via the communication unit 201. The post-processing control means 200 drives each of the connected means.

  The image forming apparatus conveys the sheet from the main body sheet feeding tray by the main body sheet feeding unit, forms the printing data stored by the image forming unit on the sheet, and then conveys it to the post-processing apparatus by the conveying unit.

  The image forming apparatus and the post-processing apparatus are connected by serial communication, and information on sheets discharged from the image forming apparatus to the post-processing apparatus is sequentially exchanged.

  The recording member from the image forming apparatus is conveyed to a post-processing apparatus by a conveying unit, and the post-processing apparatus performs necessary post-processing according to the information received through the communication, and is discharged to a designated discharge tray.

  FIG. 5 shows a paper setting method on the operation unit 9. When the “paper setting” button in FIG. 5A is pressed, a paper setting screen shown in FIG. 5B is displayed (it is called POPUP).

  As a specific example, FIG. 5B shows the paper feed tray settings shown in Table 1.

  FIG. 6 is a flowchart showing an embodiment (first embodiment) when the post-processing paper feed tray 20A (tray 4) has no paper based on the settings in Table 1.

  In step S101, the tray 4 is selected, and it is determined whether or not there is paper in the tray 4 (step S102). If there is paper (step S102: NO), the paper is fed from the tray 4 and the operation is finished.

  If there is no paper (step S102: YES), it is determined whether or not there is a fixing and pressing release means (step S104). When there is no fixing / crimping release means (step S104: NO), it is selected from the post-processing tray, and it is determined whether all of the paper size, paper type, weight and color match in the tray (step S105), and step S105: When YES is selected, the tray 5 is selected (step S106), paper feeding is performed, and the operation is completed. Step S105: When NO, the paper feed is stopped (step S107) and the operation is finished.

  If YES in step S104, it is determined whether there is a tray that matches all of the paper size, paper type, weight, and color in all trays (step S108). If YES in step S108, the main body paper feed tray It is determined whether or not there is paper in 7A (tray 1) (step S109). When step S109: YES, tray 1 is selected and fed (step S110), and the operation is completed.

  When both step S108 and step S109 are NO, the process is stopped (step S107) and the work is finished.

  Here, steps S104 to S110, where the post-processing side tray is switched to the main body side paper feeding tray, correspond to the present invention.

  Next, FIG. 7 is a flowchart showing an embodiment (embodiment 2) in the case where it is determined whether or not the tray 1 is out of paper and the tray is switched when the tray 1 is used as an insertion sheet in the inter sheet mode.

  In step S201, the tray 1 is selected. In step S202, it is determined whether or not there is paper in the tray 1. If there is paper in the tray 1 (step S202: YES), the paper is fed from the tray 1 (step S203) and the operation is finished.

  If there is no paper in the tray 1 (step S202: NO), it is determined whether the paper in the tray 1 is an insertion paper (step S204). If the paper is not an insertion paper (step S204: NO), the paper is fed in another main body feed tray. It is determined whether or not there is a tray that matches all of the size, paper type, weight, and color (step S205), and in step S205: YES, the matching tray is selected from the main body tray (step S206). ) To finish the work. Step S205: If NO, stop paper out (S207).

  When the paper in the tray 1 is an insertion paper (step S204: YES), it is determined whether there is a tray that matches in all paper sizes, paper types, weights, and colors (step S208). Step S208: If YES, it is determined whether or not there is paper in the tray 4 (step S209). Step S209: When YES is selected, the tray 4 is selected (Step S210) and the operation is finished. If S208: NO or step S209: NO, the paper is stopped (S207).

  The portions corresponding to the present invention are steps 204, S208, S209, and S210 where the main tray is switched to the post-processing tray.

1 is an overall configuration diagram of an image forming system including an image forming apparatus, an image reading apparatus, and a post-processing apparatus. Sectional drawing of a binding means. Reference drawing showing end binding. It is a block diagram showing control of image forming device A and post-processing device FS. 2 shows a user setting screen and a paper feed tray selection setting screen of an operation unit of the image forming apparatus. FIG. 10 is a flowchart of the first embodiment when the post-processing paper feed tray 20A has no paper. FIG. 10 is a flowchart illustrating a second embodiment when it is determined whether or not the tray 1 is out of paper and the tray is switched.

Explanation of symbols

9 Operation unit 20A, 20B Post-processing paper feed tray 7A, 7F, 7G Main body paper feed tray 70 Binding means (stapling means)
100 Main control means 200 Post-processing control means A Image forming apparatus FS Paper post-processing apparatus (post-processing apparatus)
K, K1, K2 Cover paper (cover sheet)
S paper (paper)
Sa Paper bundle

Claims (5)

An image forming apparatus having a plurality of stages of main body paper feed trays for storing paper, paper remaining amount detection means for detecting the remaining amount of paper, and main body paper feed means for supplying paper;
A sheet post-processing apparatus that sequentially feeds recording sheets discharged from the image forming apparatus to the stacking unit and performs post-processing by a post-processing unit;
The paper post-processing device is provided with a plurality of stages of post-processing paper feed trays for storing paper, post-processing paper remaining amount detecting means for detecting the remaining amount of paper, and post-processing paper feeding means for supplying paper.
Image formation having switching control means for performing control for switching to supply paper from either one of the post-processing paper feed tray or the main body paper feed tray when the paper runs out In the system,
The switching control unit selects the paper feed tray when there is a paper having the same size in the paper feed tray and there is a condition that at least one of the paper type, the basis weight, and the color matches. Switch control to
If there is no paper in any of the plurality of main body paper feed trays, a paper feed tray corresponding to the matching condition is selected from both the main body paper feed tray and the post-processing paper feed tray. ,
When there is no paper in any of the plurality of post-processing paper feed trays, control is performed to select a paper feed tray corresponding to the matching condition from the post-processing paper feed trays. Image forming system. In the case where a fixing press release mechanism is provided in the fixing unit included in the image forming apparatus, the switching control unit is configured to detect the absence of paper in either the main body paper feed tray or the post-processing paper feed tray. 2. The image forming system according to claim 1, wherein control is performed to select a paper feed tray corresponding to the matching condition from both a paper feed tray and the post-processing paper feed tray. In the inter sheet mode in which an inter sheet is inserted while the sheets discharged from the image forming apparatus are sequentially sent to the stacking unit, at least one of the plurality of main body feed trays includes The image forming system according to claim 1, further comprising an inter sheet. 4. The image forming system according to claim 1, wherein the plurality of post-processing paper feed trays include at least one of an inter sheet and a cover paper. 5. 5. The image forming system according to claim 1, further comprising a control unit capable of changing a condition in which a paper type, a basis weight, and a color are matched.

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