JP4982311B2 - Sheet processing apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet processing apparatus for aligning edges of a sheet bundle formed by stacking sheets on a processing tray, and an image forming apparatus provided with the sheet processing apparatus connected to or built in the apparatus main body.

  The image forming apparatus is an apparatus that forms an image on a sheet. Examples of the image forming apparatus include a copying machine, a printer, a facsimile, and a complex machine of these. The image forming apparatus may be provided with a sheet processing apparatus built into the apparatus main body that forms an image on a sheet or connected as a purchase option (so-called option). The sheet processing apparatus performs at least one process such as a process for aligning the edges of the sheet bundle (hereinafter referred to as “alignment”), a staple process for binding the sheet bundle, and a folding process for folding the bound sheet bundle. (Patent Document 1).

  A sheet processing apparatus that performs sheet bundle alignment processing aligns sheets fed from the apparatus main body into a bundle shape, and then grips and discharges the sheet bundle with a gripper serving as a gripping unit. On the other hand, the apparatus main body of the image forming apparatus forms a toner image on a sheet, heats the sheet, fixes the toner image on the sheet, and sends the heated sheet to the sheet processing apparatus. For this reason, when the gripper grips the sheet bundle while the toner image is not solidified, the sheets may adhere to each other and be discharged (discharge adhesion).

JP 2007-153465 A

  However, in the conventional sheet processing apparatus, since the gripper grips the sheet bundle in a state where the toner image is not solidified, the sheets may adhere and be discharged, and when such sheets are peeled off, The sheet may be torn or the toner image may be lost.

  In addition, an image forming apparatus equipped with such a sheet processing apparatus has to form images again for the number of sheets torn or the number of sheets for which a toner image is missing, resulting in low image forming efficiency. It was.

  It is an object of the present invention to provide a sheet processing apparatus that prevents adhesion of sheets due to a toner image.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus that includes a sheet processing apparatus that prevents adhesion of sheets due to a toner image and has improved image forming efficiency.

The sheet processing apparatus of the present invention grips the stacking means sheet formed toner images are stacked, the sheets stacked in front Symbol stacking means moves to the downstream side of the sheet conveyance direction, the gripping And discharging means for discharging the sheet and discharging control means for controlling the discharging operation of the discharging means based on the image forming state information relating to the toner image. The discharging control means includes image forming state information. When the information indicates that the sheets are difficult to adhere to each other by the toner image, the sheet stacking unit stacks the sheet on the stacking unit, and then the discharging unit discharges the sheet bundle. When it is information that the toner images are easily bonded to each other, each time a sheet is stacked on the stacking unit, the discharge unit is caused to discharge the single sheet. It is characterized.

  An image forming apparatus according to the present invention includes: an image forming unit that forms an image on a sheet; and a processing unit that processes a sheet on which a toner image is formed by the image forming unit. It is a sheet processing apparatus.

  In the sheet processing apparatus according to the present invention, when the sheets are easily adhered to each other by the toner image, the sheets are discharged one by one, so that the sheets can be prevented from being adhered to each other. For this reason, when the user separates the sheet, the sheet is not torn and the toner image is not lost.

  Since the image forming apparatus of the present invention includes a sheet processing apparatus that prevents adhesion between sheets, it is necessary to form an image again for the number of sheets torn or the number of sheets for which the toner image is missing. Therefore, the image forming efficiency can be improved.

  A sheet processing apparatus of the present invention and an image forming apparatus provided with the sheet processing apparatus in the apparatus main body will be described with reference to the drawings.

(Image forming device)
FIG. 1 is a cross-sectional view of the image forming apparatus according to the embodiment of the present invention along the sheet conveyance direction. The image forming apparatus 150 is an apparatus that forms an image on a sheet. Examples of the image forming apparatus 150 include a copying machine, a printer, a facsimile machine, and a complex machine of these. The image forming apparatus 150 includes an apparatus main body 150A that forms an image on a sheet, and a sheet processing apparatus 300 that processes the sheet on which the image is formed.

  The sheet processing apparatus 300 is connected as a purchase option (so-called option) to the apparatus main body 150A of the image forming apparatus. Note that the sheet processing apparatus 300 may be incorporated in the apparatus main body 150A. The sheet processing apparatus 300 performs processing for aligning the edges of the sheet bundle (hereinafter referred to as “alignment”).

  The apparatus main body 150A of the image forming apparatus 150 receives external information from the image processing unit 144 and processes the image, and then forms a toner image on the photosensitive drum 264, transfers the toner image to a sheet, and forms an image. To provide a seat.

  The apparatus main body 150A is provided with a sheet cassette 151 storing sheets in a lower part so that the sheet cassette 151 can be pulled out in the right direction in FIG. The sheet S in the sheet cassette 151 is sent out from the sheet cassette 151 by the pickup roller 261. The sheet S is fed between a transfer roller 265 and, for example, a photosensitive drum 264 that is an image forming unit by a pair of conveying rollers 262 and a pair of registration rollers 263. A toner image is formed on the photosensitive drum 264 in advance. Therefore, the toner image on the photosensitive drum 264 is transferred to the sheet. The sheet S to which the toner image has been transferred is heated by the fixing device 266 to fix the toner image, and then sent to the sheet processing apparatus 300 by the paper discharge roller pair 153. When the sheet processing apparatus 300 is not provided, the sheets discharged from the paper discharge roller pair 153 are discharged onto the tray 154 and stacked.

  The apparatus main body 150 </ b> A of the image forming apparatus 150 forms an image on both sides using a both-side reversal path 158. When the sheet on which the image has been formed through the above process passes through the double-sided reversal switching member 155, the sheet is switched back by reverse rotation of the paper discharge roller pair 153 and sent to the double-sided pass roller pairs 156 and 157. Then, the sheet joins the print path 159 before the registration roller pair 263, and a toner image is formed on the back surface.

  The apparatus main body 150A and the sheet processing apparatus 300 are activated when a user operates an operation panel 152 provided on the apparatus main body 150A. The control of the apparatus main body 150A is performed by the control unit 140.

(Sheet processing equipment)
FIG. 2 is a cross-sectional view of the sheet processing apparatus according to the embodiment of the present invention along the sheet conveyance direction. FIG. 3 is a view of the sheet processing apparatus according to the embodiment of the present invention as viewed from the tray 154 side of the apparatus main body 150A.

  In the description of the embodiment, the sheet conveying direction is the left-right direction in FIG. 1 (the direction of arrows D and C, the direction of arrow X in FIG. 2). The sheet discharge direction refers to the direction from the left to the right in FIG. 1 (the direction of arrow C in FIG. 2). The rear end of the sheet is an edge on the upstream side in the sheet conveying direction, and may be referred to as an upstream end. The leading edge of the sheet is an edge on the downstream side in the sheet conveying direction, and may be referred to as a downstream end. The side edge of the sheet is an edge along the sheet conveyance direction. The sheet width direction is a direction perpendicular to the sheet conveying direction and along the surface of the sheet (FIG. 2, arrows E and F directions, arrow Y direction). The vertical direction refers to the vertical direction in FIG. 1 (FIG. 2, arrow A, B direction, arrow Z direction). In each figure, an arrow X indicates the sheet conveyance direction. An arrow Y indicates the width direction of the sheet. The arrow Z direction indicates the vertical direction.

  The sheet processing apparatus 300 is placed on, for example, a tray 154, which is a discharge sheet stacking unit on which sheets discharged from, for example, the discharge roller pair 153, which is a discharge unit of the apparatus main body 150A, is stacked.

  The sheet processing apparatus 300 aligns the sheet S received by the sheet receiving unit 201 from the apparatus main body 150A on the processing tray 205 by aligning the rear end and side end of the sheet S, and then bundles the sheet S on the apparatus main body 150A. The paper is discharged to the tray 154 (FIG. 1). The processing tray 205 is an example of a stacking unit on which sheets on which toner images are formed are stacked.

  In FIG. 2, a sheet receiving unit 201 is a part that receives the sheet S discharged from the discharge roller pair 153 (FIG. 1) of the apparatus main body 150A. The sheet S discharged to the sheet receiving unit 201 is detected by the entrance sensor 202 while passing through the conveyance path 268, and is then conveyed to the conveyance roller pair 203 and the processing roller 204, and the edge on the processing tray 205. Are aligned and loaded.

  The conveyance roller pair 203 for discharging the sheet to the processing tray 205 includes a driving roller 203a and a driven roller 203b. The drive roller 203a is rotated by obtaining a rotational force from the conveyance motor 206 via a conveyance pulley gear and a conveyance belt (not shown). The processing roller 204 is formed of a cylindrical member, and an outer peripheral portion is formed of an elastic body having elasticity close to that of rubber such as rubber or foam. The processing roller 204 is held by the processing roller holder 211.

  A processing roller 204 is provided in the processing roller holder 211. The processing roller holder 211 rotates in the vertical direction (arrows A and B directions) around the shaft 212 of the processing roller holder 211. Further, the processing roller holder 211 moves the sheet once to the downstream side together with the processing roller 204, and then moves the sheet to the upstream side so that the trailing edge of the sheet S abuts against the trailing edge regulating plate 242 to align the trailing edge. It is supposed to be. Therefore, the processing roller holder 211 can reciprocate in the sheet conveying direction. Further, the processing roller holder 211 moves the sheet in the width direction of the sheet together with the processing roller 204 so that the side edge of the sheet abuts against the width direction regulating plate 243 to align the side end. For this reason, the processing roller holder 211 is configured to reciprocate in the sheet width direction (directions of arrows E and F).

  The rotation operation of the processing roller holder 211 in the vertical direction and the movement operation in the sheet conveyance direction and the sheet width direction are performed by the TD motor 216 and the driving force transmission mechanism 217. The driving force transmission mechanism 217 includes an alignment motor gear (not shown), a paper pressing cam, a rear end alignment slider, a side end alignment slider, an alignment cam, and the like.

  The processing roller holder 211, the processing roller 204, the TD motor 216, the driving force transmission mechanism 217, the trailing edge regulating plate 242 and the like constitute an alignment unit that aligns the upstream end of the sheets stacked on the processing tray 205 in the sheet conveyance direction. is doing.

  A stapler that binds a bundle of sheets whose rear ends and side ends are aligned as necessary near a width direction regulating plate 243 provided at one end in the sheet width direction of the processing tray 205 on which sheets are stacked in a bundle. 254 is provided.

  When the clamp solenoid 240 is turned off, the gripper 241 is closed by a spring (not shown) to grip the sheet bundle, and moves together with the sheet bundle in the sheet discharge direction by a TD motor 216 and a slider gear (not shown). The gripper 241 releases the grip and discharges the sheet bundle to the tray 154.

  The gripper 241, the clamp solenoid 240, the TD motor 216, and the like constitute discharge means that grips the sheets stacked on the processing tray 205, moves in the sheet discharge direction, releases the grips, and discharges the sheets.

  The processing roller 204 and the processing roller holder 211 are operated by the normal rotation of the TD motor 216, and the gripper 241 is moved by the reverse rotation of the TD motor 216.

  The tray paper presser 251 trays the sheet bundle previously stacked on the tray 154 until the sheet bundle aligned on the processing tray 205 slides on the processing tray 205 and is discharged onto the tray 154 by the gripper 241. 154 is pressed. This pressing is performed in order to prevent the previously stacked sheet bundle from moving following the sheet bundle to be discharged later, and to prevent positional deviation of the previously stacked sheet bundle. Is called.

(Control block diagram)
FIG. 4 is a block diagram illustrating a configuration of a control unit in the sheet processing apparatus 300 of the present embodiment. The CPU 100 has a ROM 110 therein. The ROM 110 stores a program corresponding to the control procedure. The CPU 100 controls each unit while reading this program.

  The CPU 100 also has a RAM 121 in which work data and input data are stored. The CPU 100 performs control with reference to data stored in the RAM 121 based on the above-described program and the like. Further, an inlet sensor 202 (FIG. 2), a processing roller position sensor, and a TD slider position sensor are connected to the input port of the CPU 100.

  Further, the transport motor 206, the TD motor 216, the clamp solenoid 240, and the stapler 254 are connected to the output port of the CPU 100. Based on these sensor states, the CPU 100 controls various motors, solenoids, and the like connected to the output port according to the above-described program and the like.

  In addition, the CPU 100 exchanges control data with the control unit 140 of the apparatus main body 150A via the serial interface unit (I / O) 130, and based on the control data sent from the control unit 140, the CPU 100 It comes to perform control. The control unit 140 is a toner image forming surface determination unit that reports, for example, the CPU 100 serving as a discharge control unit of the sheet processing apparatus, toner image forming surface information indicating whether the toner image is formed on one side or both sides of the sheet. For example, a toner image forming surface determination unit 141 is provided.

  The CPU 100 controls the sheet discharge operation of the gripper 241. The CPU 100 operates to cause the gripper 241 to discharge the sheet bundle after the sheets are stacked and aligned on the processing tray 205 when the image formation state information described later is information that the sheets are difficult to adhere to each other with the toner image. It has come to let you. Further, when the image forming state information is information that the sheets are easily bonded to each other by the toner image, the CPU 100 causes the gripper 241 to discharge the one sheet every time one sheet is stacked on the processing tray 205. It is supposed to work.

  Note that one of the CPU 100 and the control unit 140 may be integrated into the other.

(Description of operation)
The operation of the image forming apparatus will be described based on the configuration diagram of FIGS. 1 to 3, the control unit block diagram of FIG. 4, and the flowchart of FIG. 5.

  The CPU 100 receives sheet information related to sheets from the control unit 140 of the apparatus main body 150A of the image forming apparatus 150 via the serial interface unit (I / O) 130 by serial communication. The sheet information includes sheet size, information on whether or not to staple, and image formation state information such as toner image formation surface information indicating whether a toner image is formed on one side or both sides. It is assumed that the CPU 100 has not received sheet information for binding a sheet bundle from the control unit 140. For this reason, the stapler 254 (FIG. 3) does not perform the operation of binding the sheet bundle.

  The sheet sent from the apparatus main body 150A is discharged onto the processing tray 205 by the conveying roller pair 203 (S510). The processing roller 204 and the processing roller holder 211 feed a predetermined amount of the sheet in the sheet discharge direction by the TD motor 216 and the driving force transmission mechanism 217 (S520, S530).

  Thereafter, the processing roller 204 and the processing roller holder 211 convey the sheet in the upstream direction (arrow D direction) until the sheet hits the trailing edge regulating plate 242, and performs trailing edge alignment of the sheet. Thereafter, the processing roller 204 and the processing roller holder 211 move the sheet in the left direction (arrow E direction) in FIG. 3 until the side edge of the sheet hits the width direction regulating plate 243 by the TD motor 216 and the driving force transmission mechanism 217. Thus, the side edge alignment of the sheet is performed (S540). Note that the side edge alignment is not necessarily performed.

  Thereafter, the processing roller holder 211 rises in the direction of arrow A, moves the processing roller 204 away from the sheet, and the processing roller 204 and the processing roller holder 211 retract to a predetermined position.

  If the aligned one sheet is a sheet on which toner images are formed on both sides (NO in S550), the aligned sheet is discharged to the tray 154 before the subsequent sheet is fed. That is, the gripper 241 is gripped by the clamp solenoid 240 being turned off and closed by a spring (not shown). The gripper 241 moves while holding the sheet bundle in the sheet discharge direction by the TD motor 216 and a slider gear (not shown). When the gripper 241 moves to the downstream end of the processing tray 205, the gripper 241 releases the sheet and releases the sheet. . As a result, the sheet is dropped and stacked on the tray 154 (S570). The CPU 100 repeats the above operations until there are no remaining sheets in the job (NO in S580).

  The sheets stacked on the tray 154 slide down to the upstream side in the sheet conveyance direction due to the inclination of the tray 154, and are rear end alignment portions formed at the downstream end portion of the sheet processing apparatus, for example, a rear end regulating wall. It is received by 160 and the rear end is aligned. For this reason, even if the sheets are discharged one by one, the rear ends are aligned. If the trailing edge of the sheet can be aligned with the trailing edge regulating wall 160, it may not be necessary to align the trailing edge of the sheet on the processing tray 205. Discharging each sheet is inefficient and the operation noise becomes a problem. For this reason, sheets that are not likely to be adhered by the toner image are bundled on the processing tray 205, and are then gripped and discharged together by the gripper 241 to increase the discharge efficiency and reduce the generation of operation noise. ing. The tray 154 is inclined such that the upstream end in the sheet conveyance direction is lower than the downstream end.

  If the aligned first sheet is a sheet on which a toner image is formed only on one side (YES in S550), subsequent sheets are stacked after alignment. The number of sheets to be stacked is set in advance, and the alignment operation is repeated until a predetermined number of sheets (for example, 5 sheets, not limited to 5 sheets) is stacked (S560, S590, S510 to S550).

  When the sheets are stacked on the processing tray 205, the preceding sheets already stacked on the processing tray 205 overlap with the succeeding sheets discharged later, so that the following sheets follow and follow the sheet discharging direction. The rear end alignment may be disturbed due to movement. For this reason, while the succeeding sheet is being discharged onto the processing tray 205, the preceding sheet is held by the gripper 241 so as not to move in the sheet discharging direction.

  When a predetermined number of sheets (for example, 5 sheets) is reached, the clamp solenoid 240 is turned off, and the gripper 241 is closed by a spring (not shown) to grip the sheet bundle. The gripper 241 moves while holding the sheet bundle in the sheet discharge direction by the TD motor 216 and a slider gear (not shown). When the gripper 241 moves to the downstream end of the processing tray 205, the gripper 241 releases the sheet and releases the sheet. . As a result, the sheet is dropped and stacked on the tray 154 (S570). The CPU 100 repeats the above operation until there is no remaining sheet of one job (NO in S580).

  However, depending on the number of sheets of one job, there is a case where a predetermined number of sheets are discharged and a fraction is output. For example, when the number of sheets of one job is 11, 5 sheets are discharged one by one and the remaining number is a fraction. In this case, even if the CPU 100 has not reached the predetermined number (less than the predetermined number) (NO in S560, YES in S590), the CPU 100 discharges only one fraction and ends (can be discharged). NO in S570 and S580).

  Finally, the CPU 100 continues to drive the TD motor 216 until the gripper 241 returns to the home position, and stops the transport motor 206. Thus, the sheet processing apparatus 300 has finished a series of processes.

  Therefore, the image forming apparatus discharges the sheets one by one when the toner images are formed on both sides, so that adhesion between the sheets can be prevented. For this reason, the sheet is not torn and separated, and the sheet is not damaged and the toner image is not lost.

  The above description is the case where the image formation state information is toner image formation surface information indicating whether the toner image is formed on one side or both sides, and one sheet on which the toner image is formed on both sides. The sheets are discharged to the tray 154 one by one, and the single-sided sheets are discharged in a bundle.

  However, in place of the toner image forming surface determination unit 141 of the control unit 140, a printing rate determination unit that reports to the CPU 100 of the sheet processing apparatus whether or not the printing rate of the toner image on the sheet is equal to or less than a predetermined value. For example, a printing rate determination unit 142 may be provided.

  In this case, when the CPU 100 obtains the printing rate information that the printing rate is equal to or less than a predetermined value, the CPU 100 stacks and aligns the sheets on the processing tray 205 and then discharges them to the tray 154. Further, when the CPU 100 obtains the printing rate information that the printing rate exceeds a predetermined value, the CPU 100 discharges the one sheet to the tray 154 each time the sheet is stacked on the processing tray 205. . The printing rate is a value obtained by averaging the toners placed on an area where an image can be formed on the sheet (image forming area). For example, when the printing rate is 100%, a toner image is formed in the entire image forming area, and when it is 25%, the toner image is formed in 25% of the image forming area. In the case of a color image, four colors of yellow, cyan, magenta, and black are overlapped. For example, when yellow is 25%, cyan is 25%, magenta is 25%, and black is 25%, it is set to 100%. Become.

  Therefore, the image forming apparatus discharges the sheets one by one when the sheets have a high printing rate and the sheets are easily bonded to each other, so that the sheets can be prevented from being bonded to each other. For this reason, the sheet is not torn and separated, and the sheet is not damaged and the toner image is not lost.

  Further, instead of the toner image forming surface determination unit 141 of the control unit, the gripped portion information indicating whether or not the toner image is formed on the gripped portion gripped by the gripper of the sheet is reported to the CPU 100 of the sheet processing apparatus. For example, a gripped part determination unit 143 that is a gripped part determination unit may be provided.

  In this case, when the CPU 100 obtains gripped part information that a toner image is not formed on the gripped part of the sheet, the CPU 100 stacks and aligns the sheets on the processing tray 205 in a bundle and then discharges the sheet onto the tray 154. . Further, when the CPU 100 obtains gripped portion information that a toner image is formed on the gripped portion, the CPU 100 loads the single sheet on the tray 154 each time the sheet is stacked on the processing tray 205. Discharge.

  Therefore, when the toner image is formed on the gripped portion and is gripped by the gripper, the image forming apparatus discharges the sheets one by one in the case where the sheets are easily bonded to each other. For this reason, the sheet is not torn and separated, and the sheet is not damaged and the toner image is not lost.

  In the above description, the image forming state information includes toner image forming surface information, printing rate information, and gripped portion information. These pieces of information are obtained from the toner image forming surface determination unit 141, the printing rate determination unit 142, and the gripped unit determination unit 143, and each determination unit receives an image forming state from the image processing unit 144. Information is about to be reported.

FIG. 3 is a cross-sectional view of the image forming apparatus according to the embodiment of the present invention along the sheet conveyance direction. FIG. 3 is a cross-sectional view of the sheet processing apparatus provided in the image forming apparatus according to the embodiment of the present invention along the sheet conveyance direction. FIG. 3 is a view of the sheet processing apparatus of FIG. 2 as viewed from the sheet discharge side. It is a control block diagram of a sheet processing apparatus. It is a flowchart for bundling operation | movement description.

Explanation of symbols

S sheet 100 CPU (discharge control means)
140 Control Unit 141 Toner Image Forming Surface Determination Unit (Toner Image Forming Surface Determination Unit)
142 Print rate determination unit (print rate determination means)
143 Grasped part determination unit (gripped part determination means)
144 Image Processing Unit 150 Image Forming Apparatus 150A Apparatus Main Body 153 Paper Discharge Roller Pair (Discharge Unit)
154 Tray (Discharged sheet stacking means)
160 Tray rear end regulating wall (rear end alignment part)
204 Processing roller (alignment means)
205 processing tray (stacking means)
211 Processing roller holder (alignment means)
216 TD motor (alignment means) (discharge means)
217 Driving force transmission mechanism (alignment means)
240 Clamp solenoid (discharge means)
241 Gripper (Discharging means)
242 Rear end regulating plate (alignment means)
243 Width direction regulating plate 264 Photosensitive drum (image forming means)
266 Fixing Device 300 Sheet Processing Device

Claims (9)

A stacking means for stacking sheets on which toner images are formed ;
Holding the sheets stacked in front Symbol stacking means moves to the downstream side of the sheet conveyance direction, a discharge means for discharging the sheet to release the grip,
Discharge control means for controlling the discharge operation of the discharge means based on image formation state information relating to the toner image,
Said discharge control means, the image formation condition information, when the sheet to each other information that is not easily adhered by toner image, the sheet to said stacking means from being stacked in a bundle, to discharge the sheet bundle to the discharge means When the operation is performed and the image formation state information is information that the sheets are easily adhered to each other by the toner image, the discharge unit discharges the single sheet every time one sheet is stacked on the stacking unit. Make it work,
A sheet processing apparatus. Said discharge control means, based on the image forming status information for the toner image, after being stacked sheets in a bundle in the stacking unit, in the operation for discharging the sheet bundle to the discharge means, one job of the sheet among them, and discharging the sheet of the predetermined number when a predetermined number of sheets are stacked on said stacking means, finally, the of the less than predetermined number sheet when the sheet is less than the predetermined number of sheets stacked on said stacking means can be discharged Is,
The sheet processing apparatus according to claim 1. The image formation state information is toner image formation surface information indicating whether the toner image is formed on one side or both sides of the sheet.
Said discharge control means, when the toner image to obtain a toner image formation surface information formed on one side of the sheet, simplex sheets from being stacked in a bundle on the stacking means, the single-sided sheet bundle to the discharge means When the toner image forming surface information in which the toner image is formed on both sides is obtained by performing the discharging operation, each time the double-sided sheet is stacked on the stacking unit, the single-sided sheet on the discharging unit The discharge operation of
The sheet processing apparatus according to claim 1, wherein the sheet processing apparatus is a sheet processing apparatus. The image formation state information is printing rate information indicating whether the printing rate of the toner image on the sheet is equal to or less than a predetermined value,
When the discharge control means obtains the printing rate information that the printing rate is a predetermined value or less,
After the sheets are stacked in a stack on the stacking unit, the stacking unit causes the discharge unit to discharge the sheet bundle, and when the printing rate information that the printing rate exceeds a predetermined value is obtained, Each time the sheet is stacked on the means, the discharge means causes the sheet to be discharged.
The sheet processing apparatus according to claim 1, wherein the sheet processing apparatus is a sheet processing apparatus. The image formation state information is gripped portion information indicating whether or not a toner image is formed on a gripped portion gripped by the sheet discharge unit.
When the gripping unit information that the toner image is not formed on the gripped part is obtained, the discharge control unit stacks the sheet on the stacking unit and then stacks the sheet bundle on the discharge unit. When the gripped portion information that the toner image is formed on the gripped portion is obtained, every time the sheet is stacked on the stacking unit, the one sheet is loaded on the discharge unit. The sheet is discharged.
The sheet processing apparatus according to claim 1, wherein the sheet processing apparatus is a sheet processing apparatus. Image forming means for forming an image on a sheet;
A processing device for processing a sheet on which a toner image is formed by the image forming means,
6. The image forming apparatus according to claim 1, wherein the processing apparatus is a sheet processing apparatus according to any one of claims 1 to 5. The sheet processing apparatus is the sheet processing apparatus according to claim 3,
A toner image forming surface determining means for reporting toner image forming surface information indicating whether the toner image is formed on one side or both sides of the sheet to the control means of the sheet processing apparatus;
The image forming apparatus according to claim 6 . The sheet processing apparatus is the sheet processing apparatus according to claim 4,
A printing rate determining means for reporting printing rate information on whether the printing rate of the toner image on the sheet is equal to or less than a predetermined value to the control means of the sheet processing apparatus;
The image forming apparatus according to claim 6 . The sheet processing apparatus is the sheet processing apparatus according to claim 5,
A gripped portion determining means for reporting to the control means of the sheet processing apparatus whether or not a toner image is formed on the gripped portion gripped by the sheet discharging means;
The image forming apparatus according to claim 6 .

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