JP2007131440A - Sheet handling device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet handling device capable of ensuring loading property of a sheet when delivering the remaining sheet and to provide an image forming device. <P>SOLUTION: When power supply of an image forming device main body is turned on and a remaining sheet is conveyed into a second sheet loading means 410 from the image forming device main body, rear ends of the remaining sheets are aligned by a rear end aligning part. After that, a delivery means 413 is moved up to a sheet delivery position for delivering the sheet into a second sheet loading means 421 while holding the remaining sheets whose rear ends are aligned by a holding means 412. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sheet processing apparatus and an image forming apparatus, and particularly to discharge of residual sheets when power is turned on.

  2. Description of the Related Art Conventionally, some image forming apparatuses such as copiers, printers, and facsimiles are provided with a sheet processing apparatus in order to reduce the labor required for processing such as binding and punching on a sheet after image formation. In the sheet processing apparatus, sheets after image formation are sequentially taken into the apparatus, and binding processing, punching processing, and the like are selectively performed on the sheets.

  By the way, an image forming apparatus provided with such a sheet processing apparatus performs initialization control such as confirmation of meshing of driving system gears, transfer high-pressure control, and confirmation of scanner motor driving when power is turned on. After the processing by such initialization control, the image forming apparatus transitions to a standby state, starts sheet feeding if there is a print request from the connected external device, and performs image forming operation according to a predetermined electrophotographic process. Do.

  When the power supply is turned on and the presence of a remaining sheet is detected in the main body of the image forming apparatus, the control unit of the image forming apparatus controls the apparatus to shift to a jam processing state, and a predetermined jam processing by the user is performed. I'm waiting for you.

  After this, for example, when the sensor detects that the user has opened and closed the jam processing door to perform jam processing, and transmits it to the control unit of the image forming apparatus via the sensor input unit, the control unit It is detected from the door opening / closing information that jam processing has been performed. When the jam processing by the user is completed and the power is turned on again, the initialization control described above is performed and the standby state is entered.

  On the other hand, in the conventional image forming apparatus, a sheet presence / absence detection unit is arranged in the sheet conveyance path, and when the power is turned on, the image formation unit remains in the sheet conveyance path at the time of initialization to be able to start image formation. There is one that detects the presence or absence of a sheet. In such an image forming apparatus, when the remaining sheet is detected by the sheet presence / absence detecting unit, the remaining sheet is conveyed to the sheet processing apparatus in parallel with the initialization process, and is discharged to the discharge tray of the sheet processing apparatus. (For example, refer to Patent Document 1).

JP-A-8-286586

  By the way, when the remaining sheet is conveyed in this way, the conventional sheet processing apparatus discharges the remaining sheet to the sheet discharge tray. At this time, the conveyed sheet is removed from the image forming apparatus main body. The paper is conveyed and discharged according to the paper discharge speed.

  However, when the sheet is discharged in accordance with the sheet discharge speed of the image forming apparatus main body in this way, the size of the sheet to be discharged is unknown. For example, if the sheet discharge speed is too high compared to the sheet size, the sheet Are biased to the downstream side in the paper discharge direction of the paper discharge tray. Further, when the sheet is conveyed in a skewed state from the image forming apparatus main body, it is stacked on the paper discharge tray in a skewed state as it is.

  In other words, in the conventional sheet processing apparatus, when the remaining sheet is discharged, the sheet is discharged in synchronization with the discharge speed of the image forming apparatus main body, and the sheet is discharged without correcting skew feeding. The stackability of sheets on the paper tray could not be ensured.

  Accordingly, the present invention has been made in view of such a current situation, and an object of the present invention is to provide a sheet processing apparatus and an image forming apparatus capable of ensuring the stackability of sheets when discharging residual sheets. It is what.

  The present invention is connected to an image forming apparatus main body, and is provided downstream of the first sheet stacking means for stacking sheets conveyed from the image forming apparatus main body, and in the sheet conveying direction downstream of the first sheet stacking means. A sheet processing apparatus comprising: a second sheet stacking unit configured to stack sheets discharged after being processed on one sheet stacking unit; and a sheet conveying direction of the sheets stacked on the first sheet stacking unit A rear end aligning portion that aligns the rear end; and a holding unit that holds the sheet whose rear end is aligned by the rear end aligning unit, and holds the sheet while holding the sheet by the holding unit. A discharge unit that moves to a sheet discharge position to be discharged to the second sheet stacking unit by releasing the holding by the unit, and a residual sheet in the image forming apparatus main body when the image forming apparatus main body is turned on. When the remaining sheet is conveyed, after aligning the trailing edge of the remaining sheet by the trailing edge aligning unit, the discharging unit is moved to the sheet discharging position while holding the remaining sheet by the holding unit. And a control means for controlling the movement.

  As in the present invention, when the residual sheet is conveyed from the main body of the image forming apparatus when the power is turned on, after aligning the trailing edge of the residual sheet, the discharge unit is configured to hold the residual sheet by the holding unit, The sheet stacking means is moved to a sheet discharge position for discharging the sheet. Thereby, it is possible to secure the stackability of sheets when discharging the remaining sheets.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a configuration of an image forming apparatus including a sheet treatment apparatus according to an embodiment of the present invention. In FIG. 1, A is an image forming apparatus, 500 is an image forming apparatus main body, 300 is an automatic document feeder (ADF) provided on the upper surface of the image forming apparatus main body 500, and 400 is a sheet discharged from the image forming apparatus A. This is a sheet processing apparatus that performs the above processing.

  In FIG. 1, reference numeral 120 denotes a reader unit (image input device) that converts a document into image data, and 200 includes a plurality of types of sheet cassettes 204 and 205, and image data is converted into a visible image on a sheet by a print command. It is a printer unit which is an image forming unit to output.

  In the image forming apparatus A having such a configuration, when an original image is read to form an image, first, the originals stacked on the automatic original feeder (ADF) 300 are sequentially placed one by one on the platen glass. It is carried on the surface 102.

  Next, when the document is conveyed to a predetermined position on the glass surface 102 in this way, the lamp 103 of the reader unit 120 is turned on, and the scanner unit 101 moves to irradiate the document. Then, the reflected light from the original is input to the CCD image sensor unit 109 through the mirrors 105, 106, 107 and the lens 108, and electrical processing such as photoelectric conversion is performed in the CCD image sensor unit 109, and normal digital processing is performed. Is given.

  Next, the image signal subjected to the electrical processing in this manner is converted into a modulated optical signal by the exposure control unit 201 of the printer unit 200, and irradiates the photosensitive drum 202. Then, a latent image is formed on the photosensitive drum 202 by the irradiation light, and the latent image is developed by the developing device 203. As a result, a toner image is formed on the photosensitive drum 202.

  Next, the sheet S is conveyed from the sheet cassettes 204 and 205 in synchronization with the leading edge of the toner image, and the toner image is transferred to the sheet S by the transfer unit 206. Thereafter, the toner image transferred to the sheet S is fixed by the fixing unit 207. After the toner image is fixed in this way, the sheet S is discharged from the paper discharge unit 208 to the outside of the apparatus.

  Then, the sheet S output from the paper discharge unit 208 is conveyed to the sheet processing apparatus 400, and processing such as sorting and binding is performed in accordance with an operation mode designated in advance by the sheet processing apparatus 400.

  When outputting sequentially read images on both sides of one sheet S, first, the direction switching member 209 is once switched in the solid line direction in the drawing for the sheet S on which the toner image is fixed on one side by the fixing unit 207. To the path 215. Further, the direction switching member 217 is switched to the broken line direction, and the direction switching member 213 is switched to the broken line direction, whereby the sheet is conveyed to the reverse path 212 via the path 218.

  Next, after the trailing edge of the sheet passes through the direction switching member 213, the direction switching member 213 is switched to the solid line direction, and the rotation direction of the roller 211 is reversed to guide the sheet to the path 210, and then to the transfer unit 206. The sheet is conveyed to form an image on the back surface of the sheet S.

  On the other hand, the sheet processing apparatus 400 includes a stapling function that is a binding operation by a staple unit in addition to a sorting operation for sorting sheets. As shown in FIG. 2, the sheet processing apparatus 400 finally forms a processing tray 410 for processing sheets S sequentially discharged from the image forming apparatus main body 500 and a sheet bundle processed on the processing tray 410. A stack tray 421 for loading is provided. Then, a sheet bundle corresponding to the number of documents is formed on the processing tray 410 exemplified as the first sheet stacking unit, and is discharged to the stack tray 421 exemplified as the second sheet stacking unit for each sheet bundle. It is configured.

  In FIG. 2, reference numeral 401 denotes a sheet receiving unit that receives the sheet S discharged from the image forming apparatus main body 500. After the sheet S received by the sheet receiving unit 401 is detected by the entrance sensor 403, the sheet S is transported by the transport roller 405 and the offset roller 407, and then transported onto the processing tray 410 as shown in FIG. The sheets S stacked on the processing tray 410 in this way are detected by a sheet bundle discharge sensor 415 shown in FIG.

  The offset roller 407 is held up and down by an offset roller arm 406 that can move up and down about a shaft 406a shown in FIGS. When the sheet S is conveyed to the processing tray 410, the sheet S moves upward via the offset roller arm 406. Thus, the sheet S is conveyed onto the processing tray 410 without being interrupted by the offset roller 407 by the conveying roller 405.

  The offset roller arm 406 can be moved up and down about a shaft 406a by a pickup solenoid 433. That is, the offset roller 407 moves up and down via the down lever 433a when the pickup solenoid 433 is turned on / off.

  Further, as shown in FIG. 5, the offset roller 407 is driven through belts 431a and 431b by a transport motor 431 that drives the transport roller 405. When the transport motor 431 rotates, the offset roller 407 rotates in the transport direction or in the reverse direction of the transport direction (hereinafter referred to as reverse rotation) by an amount corresponding to the rotation amount of the transport motor 431.

  In this embodiment, the pickup solenoid 433 is turned off before the sheet is completely removed from the conveying roller 405. That is, the timing at which the pickup solenoid is turned off is set from the sheet movement amount from the entrance sensor (80 mm in the present embodiment). As a result, the offset roller 407 descends by its own weight and lands on the sheet, and then rotates in the sheet conveying direction for a predetermined time, and reverses when a predetermined time elapses.

  As a result of the reverse rotation of the offset roller 407 in this way, the trailing edge of the sheet is erected at the upstream end in the conveying direction of the processing tray 410 shown in FIG. It abuts against the illustrated sheet rear end stopper 411.

  In the present embodiment, the trailing edge in the sheet conveyance direction of the sheets stacked on the processing tray 410 is aligned by the offset roller 407 exemplified as the sheet conveyance means capable of forward and reverse rotation and the sheet trailing edge stopper 411. A rear end alignment portion 408 is configured. The trailing edge aligning unit 408 aligns the sheet S in the transport direction.

  In FIG. 4, reference numeral 416 denotes a positioning wall serving as a side end regulating member that regulates the position of the end of the sheet in the direction orthogonal to the sheet conveyance direction (hereinafter referred to as the width direction). A stapler unit 420 is disposed near the positioning wall of the processing tray 410 and serves as a binding unit that performs a stapling process on a sheet bundle formed on the processing tray 410.

  The offset roller 407 moves in the width direction via the rack 406c and the pinion 406a by driving an offset motor 432 that can be rotated forward and backward as drive means that constitutes a moving means together with the offset roller 407. As a result, the offset roller 407 can be moved close to or away from the positioning wall 416.

  When the offset roller 407 approaches the positioning wall 416, the sheet that is abutted against the sheet trailing edge stopper 411 and aligned in the conveyance direction moves to the positioning wall 416 by the frictional force of the offset roller 407 and is positioned in the width direction. Is done. After the sheet S hits the positioning wall 416, the offset roller 407 moves and stops while sliding on the sheet.

  Here, by providing such an offset roller 407, the sheet discharged onto the processing tray 410 is first moved to the stack tray side by the offset roller 407 that rotates in the sheet conveying direction as shown in FIG. Be transported. Thereafter, as shown in FIG. 6B, the sheet is returned to the sheet trailing edge stopper 411 by the reverse rotation of the offset roller 407, and then, the trailing edge is brought into contact with the trailing edge stopper 411 for alignment.

  In FIG. 6 and FIG. 7 to be described later, different from FIG. 4 described above, the offset roller 407 is described using a configuration in which the offset roller arm 406 is disposed. The difference is just a design difference. That is, there is no difference in function and action from the configuration shown in FIG.

  On the other hand, in FIG. 5, reference numeral 412 denotes a sheet clamp member exemplified as a holding unit that presses the rear end portion of the aligned sheet S from above by a biasing force by a biasing unit (not shown). After the alignment in the width direction of the sheet S and the trailing end alignment of the sheet is completed, when the offset roller 407 is lifted by the pickup solenoid 433, the aligned sheet S is pressed from above by the sheet clamp member 412. ing.

  Thereby, the sheet S previously discharged (conveyed) to the processing tray 410 can be held at a predetermined position without being influenced by the subsequent feeding by the sheet S sequentially fed thereafter. The sheet clamp member 412 rotates upward as shown in FIG. 7 so that the sheet S can be received when the offset roller 407 is reversely rotated.

  In FIG. 5, reference numeral 413 denotes a sheet bundle discharge member exemplified as a discharge unit for discharging the processed sheet bundle to the stack tray 421. The sheet bundle discharge member 413 rotatably holds the sheet clamp member 412. . Further, the sheet bundle discharge member 413 is provided on the downstream side of the processing tray 410 shown in FIG. 8 in a state in which the aligned or aligned sheet bundle is held by the sheet clamp member 412. It moves in the direction of the stack tray 421.

  Thereafter, when the leading end of the processing tray 410, which is the sheet discharge position indicated by the solid line in FIG. 8, is reached, the holding of the sheet bundle SA by the sheet clamp member 412 on the stack tray 421 is released, and the sheet bundle SA is stacked. The tray 421 is discharged and stacked. Note that the sheet bundle SA discharged and stacked on the stack tray 421 is held by a pressing member 421A shown in FIG.

  Here, power is transmitted to the sheet bundle discharge member 413 through a rack and a pinion by a sheet bundle discharge motor 430 as shown in FIG. Thus, the sheet can be reciprocated to the position for discharging the sheet to the stack tray 421 and the home position in the vicinity of the rear end stopper 411. The sheet bundle discharge member 413 is normally fixed at the home position by excitation of the sheet bundle discharge motor 430.

  In FIG. 5, reference numeral 434 denotes a clamp solenoid for rotating the sheet clamp member 412. The clamp solenoid 434 is turned on when the rotation is stopped after the offset roller 407 conveys the sheet and when the offset roller 407 moves in the width direction. When the clamp solenoid 434 is turned on, the sheet clamp member 412 rotates upward via a lever 434a and a release lever portion 412a provided on the sheet clamp member 412.

  FIG. 9 is a block diagram showing the configuration of the control unit of the sheet processing apparatus 400 having such a configuration. In FIG. 9, reference numeral 100 denotes a CPU exemplified as the control means in the present embodiment. Here, the CPU 100 has a ROM 110 therein, and programs and the like corresponding to control procedures shown in FIGS. 10 and 11 to be described later are stored in the ROM 110. The CPU 100 controls each unit while reading this program.

  Further, the CPU 100 has a built-in RAM 121 in which work data and input data are stored, and the CPU 100 performs control with reference to data stored in the RAM 121 based on the program. Furthermore, an input port of the CPU 100 is connected to an inlet sensor 403 exemplified as a sheet detection unit, a sheet bundle discharge sensor 415 and the like, and a stay jam timer T for detecting sheet stay in the sheet processing apparatus.

  Further, a motor and a solenoid such as a conveyance motor 431, an offset motor 432, a sheet bundle discharge motor 430, a pickup solenoid 433, and a clamp solenoid 434 are connected to the output port of the CPU 100. The CPU 100 controls loads such as various motors and solenoids connected to the output port in accordance with the program described above based on the state of these sensors.

  The CPU 100 includes a serial interface unit (I / O) 130. Then, control data is exchanged with the image forming apparatus main body 500 (control unit thereof) and control data sent from the image forming apparatus main body 500 (control unit thereof) via the serial interface unit (I / O) 130. Based on the above, each part is controlled.

  Note that the image forming apparatus main body 500 knows the size of the sheet discharged from the sheet discharge unit 208. Accordingly, the control unit of the sheet processing apparatus 400 including the microcomputer system can grasp the size of the sheet inserted on the processing tray 410 by serial communication with the control unit of the image forming apparatus main body 500. Yes.

  In the present embodiment, the sheet bundle stacked on the stack tray 421 constitutes a part of the processing tray 410. Therefore, when the sheet bundle SA is discharged from the processing tray 410, the stack tray 421 is moved by the stack tray lifting motor 450 (see FIG. 9) until the uppermost surface of the stacked sheet bundle substantially coincides with the processing tray 410. It comes to descend.

  Next, the remaining sheet processing operation when the sheet processing apparatus 400 and the image forming apparatus main body 500 are turned on will be described with reference to the flowcharts shown in FIGS.

  When the image forming apparatus main body 500 detects a sheet remaining in the apparatus (in the pass) by a residual sheet detecting unit (not shown) when the power is turned on (Y in S1000), the image forming apparatus main body 500 causes the sheet processing apparatus 400 to Then, the sheet is discharged (S1001).

  The CPU 100 (see FIG. 9) of the sheet processing apparatus 400 detects the sheet discharged from the image forming apparatus main body 500 with the entrance sensor 403 of the sheet processing apparatus 400, and when the entrance sensor 403 is turned on (Y in S1010), the pickup is performed. The solenoid 433 is turned on. As a result, the offset roller 407 supported by the offset roller arm 406 is pulled up and raised (S1020).

  Next, the transport motor 431 is turned on, and the transport roller 405 and the offset roller 407 installed in the middle of the paper discharge path are rotated in the same sheet transport direction as the paper discharge direction from the image forming apparatus main body 500 (S1030). Thereafter, when the sheet reaches the conveying roller 405 and power is transmitted from the conveying roller 405 to the sheet, and the sheet is separated from the paper discharge unit 208 (see FIG. 1) of the image forming apparatus main body 500, the sheet is transferred. Complete.

  Next, in order to detect sheet retention (jam) in the sheet processing apparatus, a retention jam timer T is set (S1040). Next, while the sheet is conveyed 80 mm to the processing tray 410 by the conveying roller 405 in this embodiment (S1050), the pickup solenoid 433 is turned off before the sheet is completely removed from the conveying roller 405. As a result, the offset roller 407 is lowered onto the sheet by its own weight (S1060).

  Thereafter, the process waits for the trailing edge of the sheet to pass and the entrance sensor 403 of the sheet processing apparatus to turn off (S1070). When the inlet sensor 403 is turned off (Y in S1070), it is determined that no sheet jam has occurred, and the staying jam timer T is reset (S1090).

  Further, the offset roller 407 is rotated for a predetermined time after the entrance sensor 403 is turned off, and the sheet S is conveyed so that the sheet rear end moves to a predetermined position downstream of the sheet rear end stopper 411. When the sheet S is conveyed to such a position, the rotation of the conveyance motor 431 is stopped, and the conveyance roller 405 and the offset roller 407 are stopped (S1100).

  If the jam sensor T of the sheet processing apparatus does not turn off even if the staying jam timer T expires (Y in S1150) (N in S1070), it is determined that a jam has occurred, and a transition is made to the jam state. (S1160).

  Next, when the rotation of the offset roller 407 stops, the clamp solenoid 434 is turned on (S1100), and as shown in FIG. 6B, the sheet clamp installed at the home position in the vicinity of the sheet trailing edge stopper 411. Open member 412. Thereafter, the conveyance motor 431 is rotated in the direction opposite to the conveyance direction, the sheet S is pulled back by the offset roller 407 (S1120), and the sheet trailing edge is abutted against the sheet trailing edge stopper 411.

  Note that the amount of rotation of the offset roller 407 when the trailing edge of the sheet abuts against the trailing edge stopper 411 needs to take into account the skew of the sheet S that occurs when the sheet is fed from the image forming apparatus main body 500. For this reason, in this embodiment, the rotation amount of the offset roller 407 is set so that the sheet S can be conveyed slightly more than the distance from the point where the conveyance of the sheet S is stopped and switched back to the sheet trailing edge stopper 411. .

  Next, the offset roller is raised (S1130), and the sheet bundle discharge member 413 is gripped (held) by the sheet bundle discharge motor 430 and the sheet S is held by the sheet clamp member 412 as shown in FIG. Advance in the direction of the stack tray 421. When the sheet bundle discharge member 413 reaches the leading end of the processing tray 410, the sheet holding by the sheet clamp member 412 is released on the stack tray 421, and the sheet is discharged to the stack tray 421 (S1140).

  After the sheet is discharged in this way, the sheet bundle discharge member 413 is returned to the home position. Further, the pickup solenoid 433 is turned off, the offset roller 407 is lowered, and the series of processes is completed.

  As described above, when the residual sheet is conveyed from the image forming apparatus main body 500 when the power is turned on, the rear end of the residual sheet is aligned, and the sheet bundle discharging member 413 is stacked while holding the residual sheet. The tray 421 is moved to the discharge position. Thereby, even when the sheet size is unknown, the consistency of the remaining sheets on the stack tray can be ensured.

  In this embodiment, the CPU 100 performs control while reading the program written on the RAM (or ROM) shown in the flowcharts of FIGS. 10 and 11, but the processing on the control program is performed by hardware. The same effect can be obtained even if configured to do so.

  In the above description, the case where the CPU 100 of the sheet processing apparatus 400 performs the above-described control has been described. However, the above-described control may be performed by the control unit of the image forming apparatus main body 500.

1 is a cross-sectional view illustrating a configuration of an image forming apparatus including a sheet treatment apparatus according to an embodiment of the present invention. The figure explaining the structure of the said sheet processing apparatus. The figure which shows a mode that a sheet | seat is discharged on the processing tray of the said sheet processing apparatus. The figure explaining the drive mechanism of the offset roller of the said sheet processing apparatus, and a conveyance roller. The figure explaining the drive mechanism of the offset roller of the said sheet processing apparatus, a conveyance roller, a sheet bundle discharge member, and a sheet clamp member. The figure explaining operation | movement of the said offset roller, and the motion of a sheet accompanying it. The figure explaining operation | movement of the said sheet clamp member. FIG. 4 is a diagram illustrating a state where the sheet bundle discharge member discharges a sheet bundle to a stack tray. The block diagram which shows the structure of the control part of the said sheet processing apparatus. 6 is a flowchart for explaining a part of sheet processing operation when the sheet processing apparatus and the image forming apparatus main body are turned on. 6 is a flowchart for explaining the remaining part of the sheet processing operation when the sheet processing apparatus and the image forming apparatus main body are turned on.

Explanation of symbols

100 CPU
200 Printer unit 400 Sheet processing device 403 Entrance sensor 407 Offset roller 408 Rear end alignment unit 410 Processing tray 411 Sheet rear end stopper 412 Sheet clamp member 413 Sheet bundle discharge member 421 Stack tray 500 Image forming apparatus main body A Image forming apparatus S Sheet SA Sheet bundle

Claims (6)

A first sheet stacking unit connected to the image forming apparatus main body and configured to stack sheets conveyed from the image forming apparatus main body; and a first sheet stacking unit provided downstream of the first sheet stacking unit in the sheet conveying direction. A sheet processing apparatus comprising: a second sheet stacking unit configured to stack sheets discharged after being processed on the unit;
A trailing edge aligning section for aligning trailing edges in the sheet conveying direction of the sheets stacked on the first sheet stacking means;
And holding means for holding the sheet whose trailing edge is aligned by the trailing edge aligning portion, and holding the sheet by the holding means, and releasing the holding by the holding means and the second sheet. Discharging means for moving to a sheet discharging position for discharging to the stacking means;
When the image forming apparatus main body is turned on, if there is a residual sheet in the image forming apparatus main body and the residual sheet is conveyed, the rear end alignment unit aligns the rear end of the residual sheet and then holds the holding And a control unit that controls the discharge unit to move to the sheet discharge position while holding the remaining sheet by the unit.   The trailing edge aligning unit is provided upstream of the first sheet stacking unit in the sheet transport direction, and regulates a trailing end of the sheet, and transports the sheet transported to the first sheet stacking unit. The sheet processing apparatus according to claim 1, further comprising a sheet conveying unit capable of rotating in the forward and reverse directions in which the sheet is conveyed in a direction and then conveyed in a direction opposite to the sheet conveying direction and brought into contact with the regulating member. . Sheet detecting means for detecting the trailing edge of the sheet conveyed from the image forming apparatus main body;
Control means for controlling the drive of the sheet conveying means,
When the control means determines that the sheet conveyed by the sheet conveying means has passed through the regulating member based on a signal from the sheet detecting means, the control means reverses the sheet conveying means and applies the sheet to the regulating member. The sheet processing apparatus according to claim 2, wherein the sheet processing apparatus is in contact with the sheet processing apparatus.   An image forming unit that forms an image on a sheet, and the sheet processing apparatus according to claim 1 that processes the sheet on which an image is formed by the image forming unit. Image forming apparatus.   The image forming apparatus according to claim 4, wherein the control unit is provided in the sheet processing apparatus or the image forming apparatus main body. An image forming unit that forms an image on a sheet; a first sheet stacking unit that stacks a sheet on which an image is formed by the image forming unit; and a downstream of the first sheet stacking unit in a sheet conveying direction, An image forming apparatus comprising: a second sheet stacking unit configured to stack sheets discharged after being processed on one sheet stacking unit;
A trailing edge aligning section for aligning trailing edges in the sheet conveying direction of the sheets stacked on the first sheet stacking means;
And holding means for holding the sheet whose trailing edge is aligned by the trailing edge aligning portion, and holding the sheet by the holding means, and releasing the holding by the holding means and the second sheet. Discharging means for moving to a sheet discharging position for discharging to the stacking means;
When the image forming apparatus is turned on, there is a residual sheet upstream in the sheet conveyance direction of the first sheet stacking unit, and when the residual sheet is conveyed, the trailing edge aligning unit removes the trailing edge of the residual sheet. An image forming apparatus comprising: a control unit configured to control the discharge unit to move to the sheet discharge position while holding the remaining sheet by the holding unit after alignment.

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