JP2019210072A - Sheet conveying device and image forming system - Google Patents

Abstract

To suppress frictional resistance with a guide member at a time of skew feeding correction.SOLUTION: The sheet conveying device including a first conveying roller pair 201 and a second conveying roller pair 202 disposed upstream of the first conveying roller pair 201 in a sheet conveying direction D1 and capable of executing a skew feeding correction mode for correcting skew feeding of a sheet S by rotating the second conveying roller pair 202 in a state where the first conveying roller pair 201 is stopped to convey the sheet S and contacting a downstream end of the sheet S with a nip of the first conveying roller pair 201, includes a first guide member 203 and a second guide member 204, disposed on mutually opposite sides of a nip line L1 of the first conveying roller pair 201, for bending the sheet S conveyed from the second conveying roller pair 202 to the first conveying roller pair 201 to both sides of the nip line L1 when executing the skew feeding correction mode.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sheet conveying apparatus and an image forming system that are used in an image forming apparatus and a sheet processing apparatus such as a copying machine and a printer, and convey a sheet.

  2. Description of the Related Art Conventionally, an image forming apparatus such as a copier has been widely equipped with a skew correction device that corrects skew of a sheet being conveyed. For example, a loop is formed in the sheet between the first conveyance roller pair on the upstream side and the second conveyance roller pair on the downstream side, and the sheet is placed in the nip portion of the registration roller pair on the downstream side of the second conveyance roller pair. A skew correction device is known that separates the rollers of the second transport roller pair before the leading ends thereof (see Patent Document 1). In this skew feeding correction device, the leading edge of the sheet is brought into contact with the nip portion of the registration roller pair and the abutting portion such as a shutter to bend the sheet so as to form a loop, so that the leading edge of the sheet follows the nip portion. To correct the skew of the sheet.

Japanese Patent Laying-Open No. 2015-20902

  However, in the technique described in Patent Document 1 described above, since the loop is formed only in one direction with respect to the conveyance path, the amount of bending of the loop tends to increase, and the sheet loop and the guide member that regulates the loop Frictional resistance increases. For this reason, there is a possibility that the rotation of the sheet when the front end of the sheet comes into contact with the registration roller pair may be excluded, and there is a possibility that the skew correction cannot be performed as expected.

  An object of the present invention is to provide a sheet conveying apparatus and an image forming system capable of suppressing a frictional resistance with a guide member at the time of correcting skew feeding of a sheet.

  The sheet conveying apparatus of the present invention is arranged on the upstream side in the sheet conveying direction of the first conveying roller pair for conveying the sheet and the first conveying roller pair, and is capable of conveying the sheet to the first conveying roller pair. A pair of conveyance rollers, and with the first conveyance roller pair stopped, the second conveyance roller pair is rotated to convey the sheet, and the downstream end of the sheet is abutted against the nip of the first conveyance roller pair. A sheet conveyance device capable of executing a skew correction mode for correcting sheet skew by being arranged on opposite sides of a first nip line that is a nip line of the first conveyance roller pair, A first guide member and a second guide member that bend the sheet conveyed from the second conveyance roller pair to the first conveyance roller pair on both sides of the first nip line when the skew correction mode is executed. Equipped with The features.

  According to another aspect of the present invention, there is provided an image forming system comprising: an image forming apparatus that forms an image on a sheet; and the sheet conveying apparatus that corrects skew of the sheet formed by the image forming apparatus. .

  According to the sheet conveying apparatus and the image forming system of the present invention, it is possible to suppress the frictional resistance with the guide member at the time of correcting the skew of the sheet.

1 is a schematic cross-sectional view illustrating a structure of an image forming system including a skew feeding correction device and an image forming device according to an embodiment of the present invention. It is a schematic side view showing the skew feeding correction device of this embodiment. It is a block diagram which shows the control system of the skew feeding correction apparatus of this embodiment. 6 is a flowchart illustrating a procedure for correcting skew of a sheet by the skew correction device of the present embodiment. FIG. 5 is a schematic side view showing an operation when a process for correcting skew of a sheet is executed by the skew correction device of the present embodiment, and (a) shows a state in which passage of the downstream end of the sheet is detected by a registration sensor. (B) is a state where the sheet begins to bend into an S-shape, and (c) is a state where the sheet is further bent. FIG. 6 is a schematic side view illustrating an operation when a process of correcting the skew of a sheet is executed by the skew correction device of the present embodiment, in which (a) shows a state in which the downstream portion of the sheet is sandwiched by a second conveyance roller pair. (B) is the state which rotated the 1st cover member upward, (c) is the state which the sheet | seat bent greatly upwards. FIG. 6 is a schematic side view showing an operation when correcting a skew of a sheet by the skew correction device of the present embodiment, and (a) shows a state in which the conveyance of the sheet by the second conveyance roller pair is started. (B) is a state in which the passage of the upstream end of the sheet is detected by the registration sensor.

  Hereinafter, an image forming system 1 according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the image forming system 1 includes an image forming apparatus 100, a skew correction device (sheet conveying device) 200, and a post-processing device 300, which are separately provided. Among these, the skew feeding correction device 200 and the post-processing device 300 are supplied as optional devices and can be connected to the image forming apparatus 100 as necessary. However, the skew correction device 200 and the post-processing device 300 are not limited to being configured separately, and the skew correction device 200 and the post-processing device 300 may be housed in a common casing. Good.

  The image forming apparatus 100 is an apparatus that forms an image on the sheet S. An image reading device 120 and a document feeding device (ADF) 110 for feeding a document to the reading position of the image reading device 120 are provided on the upper part of the apparatus main body 100A of the image forming apparatus 100. The document feeder 110 feeds the documents D placed on the stacker 111 by the user one by one to the platen glass 121 of the image reading device 120. The document feeder 110 is provided on the image reading device 120 so as to be freely opened and closed via a swinging mechanism or the like. By opening the document feeder 110, the platen glass 121 can be exposed, and a document to be read can be placed thereon.

  The image reading device 120 reads a document fed onto the platen glass 121 by the document feeding device 110 or a document placed on the platen glass 121, processes the read image information, and sends the processed image information to the laser scanner unit 130. . The laser scanner unit 130 irradiates a charged photosensitive drum 140 with a laser to form an electrostatic latent image on, for example, the photosensitive drum 140 that is an image forming unit. The electrostatic latent image is developed by the developing device 141 to become a toner image. The toner image formed on the photosensitive drum 140 is transferred by the transfer charger 142 to the sheet S fed from the supply cassettes 150a and 150b. The sheet S to which the toner image is transferred is heated and pressed by the fixing device 143 to fix the toner image. The sheet S on which the toner image is fixed is discharged to the skew feeding correction device 200 by the main body discharge roller pair 160. Further, when toner images are formed on both sides of the sheet S, the sheet S can be reversed and fed to the photosensitive drum 140 through a reversing path 144.

  When the sheet S is discharged via the main body discharge roller pair 160, it is detected by a main body discharge port sensor (not shown). When the main body discharge port sensor detects the discharge of the sheet S, a main body discharge signal is transmitted from the control unit 190 of the image forming apparatus 100 to the control unit 290 of the skew feeding correction device 200. The control unit 290 of the skew correction device 200 determines, for example, the operation timing of the second transport roller pair 201 based on the main body discharge signal from the control unit 190 of the image forming apparatus 100.

  The control unit 190 is configured by a computer and includes, for example, a CPU, a ROM that stores a program for controlling each unit, a RAM that temporarily stores data, and an input / output circuit that inputs and outputs signals to and from the outside. The CPU is a microprocessor that controls the entire control of the image forming apparatus 100 and is the main body of the system controller. The control unit 190 is connected to, for example, an input unit 80 that allows a user to input various types of information to the image forming apparatus 100 and a display unit 90 that can display various types of information (see FIG. 3).

  A sheet on which an image is formed by the image forming apparatus 100 is delivered to the skew feeding correction apparatus 200. The skew feeding correction device 200 can execute skew feeding correction processing for correcting the skew feeding of the sheets that are image-formed and sequentially carried out by the image forming apparatus 100. After the skew feeding correction processing is executed, the skew feeding correction processing is performed. The sheet is delivered to the post-processing apparatus 300 without executing. The skew correction device 200 is disposed on the upstream side of the first conveyance roller pair 201 and the first conveyance roller pair 201 in the sheet conveyance direction, and is capable of conveying the sheet S to the first conveyance roller pair 201. 2 conveyance roller pair 202. Further, the skew feeding correction device 200 rotates the second conveyance roller pair 202 in a state where the first conveyance roller pair 201 is stopped to convey the sheet S, and the downstream end of the sheet S is moved to the nip of the first conveyance roller pair 201. The skew correction process (skew correction mode) for correcting the skew of the sheet S can be executed by abutting against the sheet. Details of the skew correction device 200 will be described later.

  The post-processing device 300 is connected to the discharge port of the skew correction device 200, receives a sheet after skew correction processing or a sheet not subjected to skew correction processing from the discharge port, and performs post-processing such as stapling or punch punching. To store on the final storage stacker 301.

  Next, the configuration of the skew feeding correction apparatus 200 will be described with reference to FIG. In FIG. 2, a direction in which the sheet S is conveyed is illustrated as a sheet conveying direction D1. As shown in FIG. 2, the first conveyance roller pair 201 of the skew feeding correction device 200 is disposed so as to be opposed to the first conveyance lower roller 201a formed of a rubber roller and the first conveyance lower roller 201a. A first conveying upper roller 201b that rotates. The first lower conveyance roller 201a is connected to the first conveyance motor M1 (see FIG. 3) via a drive mechanism (not shown), and rotates by driving the first conveyance motor M1. The first transport upper roller 201b is pressed against the first transport lower roller 201a by the elastic force of a biasing spring (not shown). When the first conveying roller pair 201 is stopped, the skew of the sheet is corrected by contacting the nip portion of the first conveying lower roller 201a and the first conveying upper roller 201b so that the leading edge of the sheet is along. A nip line (first nip line) L1 between the first lower conveyance roller 201a and the first upper conveyance roller 201b is provided substantially horizontally toward the main body discharge roller pair 160 and forms a conveyance path for the sheet S.

  The second conveyance roller pair 202 provided on the upstream side in the sheet conveyance direction D1 of the first conveyance roller pair 201 is opposed to the second conveyance lower roller 202a formed by a rubber roller and the second conveyance lower roller 202a. And a second conveying upper roller 202b that is arranged and rotates in a driven manner. The second transport lower roller 201a is connected to the second transport motor M2 (see FIG. 3) via a drive mechanism (not shown), and rotates by driving the second transport motor M2. The second transport upper roller 202b is pressed against the second transport lower roller 202a by the elastic force of a biasing spring (not shown). The second conveying roller pair 202 is arranged to have a nip line (second nip line) L2 that is inclined toward the first guide member 203 described later with respect to the nip line L1.

  In the present embodiment, the conveyance distance L from the second conveyance roller pair 202 to the first conveyance roller pair 201 is set to about 80 mm. Therefore, skew correction processing is performed with the upstream side of the sheet S held between the main body discharge roller pair 160 of the image forming apparatus 100.

  Between the first conveyance roller pair 201 and the second conveyance roller pair 202, a first guide member 203 and a second guide member 204 arranged on opposite sides of the nip line L1, that is, the conveyance path, are provided. . In the present embodiment, the first guide member 203 is disposed above the nip line L1, and the second guide member 204 is disposed below the nip line L1. The first guide member 203 and the second guide member 204 indicate the sheet S conveyed from the second conveyance roller pair 202 to the first conveyance roller pair 201 by a dotted line in FIG. Are bent on both sides of the nip line L1.

  The guide members 203 and 204 interposed between the first conveyance roller pair 201 and the second conveyance roller pair 202 are for regulating the flow of the conveyed sheet, and the first guide member 203 is disposed on the conveyance surface. On the other hand, the second guide member 204 is bent upward, and the second guide member 204 is bent downward, so that each guide member 203, 204 has a guide shape opened up and down to form a space. In the present embodiment, in the skew correction process, the first guide member 203 contacts the sheet S to form the upper loop R1 toward the first guide member 203, and the second guide member 204 contacts the sheet S. Thus, the lower loop R2 toward the second guide member 204 is formed. That is, in the skew correction process, the first guide member 203 contacts the sheet S to form an upper loop R1 upward, and the second guide member 204 contacts the sheet S and moves downward to the lower loop R2. Form.

  The first guide member 203 has an upper first inclined portion (first guide portion) 206, an upper second inclined portion 207, and an upper third inclined portion 208 continuously from the downstream side in the sheet conveying direction D1. doing. The upper first inclined portion 206 has a roller 205 as a rotating body on the downstream side portion in the sheet conveying direction D1. The roller 205 is conveyed at the downstream side in the sheet conveying direction D1 of the upper first inclined portion 206, having a rotation axis along each rotation axis of the rollers 201a and 201b of the first conveying roller pair 201. It is provided so as to be able to rotate following the seat. One or a plurality of rollers 205 are provided on the coaxial rotation center line. The upper first inclined portion 206 is inclined upward toward the downstream side in the sheet conveying direction D1, the upper second inclined portion 207 is inclined downward toward the downstream side in the sheet conveying direction D1, and the upper third inclined portion 208 is Inclined upward toward the downstream side in the sheet conveying direction D1, and is provided respectively.

  The roller 205 is disposed such that the rotation center line is located below the nip line L1. That is, at least a part of the downstream side portion of the upper first inclined portion 206 in the sheet conveying direction D1 is disposed on the second guide member 204 side from the nip line L1.

  The second guide member 204 includes a lower end 209, a lower first inclined portion (second guide portion) 210, and a lower second inclined portion 211 continuously from the downstream side in the sheet conveying direction D1. Have. The lower first inclined portion 210 is inclined downward toward the downstream side in the sheet conveying direction D1, and the lower second inclined portion 211 is inclined upward toward the downstream side in the sheet conveying direction D1. .

  In the skew correction processing, the sheet conveyed from the second conveying roller pair 202 is conveyed to the first guide member 203 side above the nip line L1, and is nipped by the upper first inclined portion 206 of the first guide member 203. It is bent and guided toward the lower side on the opposite side beyond the line L1 (see FIG. 5A). The sheet S conveyed from the upper first inclined portion 206 is guided by being bent toward the nip line L1 by the lower first inclined portion 210 of the second guide member 204 (see FIG. 5B). ).

  A registration sensor 220 is provided below the roller 205 and below the second guide member 204. The registration sensor 220 is composed of, for example, an optical sensor whose sensor surface faces the nip line L1, and the output signal changes when the downstream end or the upstream end of the sheet S passes immediately before the sensor surface of the registration sensor 220. Passage can be detected.

  Here, the first guide member 203 is provided so as to be rotatable about the rotation axis of the roller 205. The first guide member 203 is connected to a guide motor M3 (see FIG. 3) via a drive mechanism (not shown), and is rotated by driving the guide motor M3. The first guide member 203 is displaceable between a closed state shown in FIG. 2 and an open state shown in FIG. In the open state, the first guide member 203 has an open space Sp between the first guide member 203 and the second transport roller pair 202.

  As shown in FIG. 3, the control unit 290 that drives and controls the skew correction device 200 is configured by a computer, for example, a CPU 291, a ROM 292 that stores a program for controlling each unit, and a RAM 293 that temporarily stores data. And an input / output circuit (I / F) 294 for inputting / outputting signals to / from the outside. The CPU 291 is a microprocessor that controls the entire skew correction device 200 and is the main body of the system controller. The CPU 291 is connected to each unit via the input / output circuit 294, exchanges signals with each unit, and controls the operation. The control unit 290 is connected to a sensor, a motor, or the like, and can control the motor or the like based on the detection result of the sensor or the like. In addition, the control unit 290 communicates with the control unit 190 of the image forming apparatus 100 via the input / output circuit 294 to transmit and receive job information and data such as a sheet delivery notification. For example, a first transport motor M1, a second transport motor M2, a guide motor M3, and a registration sensor 220 are connected to the control unit 290. Note that the trigger of the component to be driven in the skew correction device 200 is a registration sensor 220, and the operation is controlled after a predetermined time has elapsed since the registration sensor 220 detected the passage of the leading edge of the sheet S. .

  Next, the procedure of skew correction processing in the skew correction device 200 of the present embodiment will be described with reference to the flowchart shown in FIG. 4 and FIGS. 5 (a) to 7 (b). In this embodiment, the skew correction process is executed by the control unit 290 of the skew correction device 200, but may be executed by the control unit 190 of the image forming apparatus 100.

  In the image forming apparatus 100, when the sheet S is discharged via the main body discharge roller pair 160, the discharge of the sheet S is detected by the main body discharge port sensor. As a result, the control unit 190 of the image forming apparatus 100 transmits a job signal for conveying the sheet S to the control unit 290 of the skew feeding correction device 200, and the control unit 290 obtains job information (step S1). . The controller 290 stops the first transport motor M1, stops the first transport roller pair 201, and drives the second transport motor M2 to rotate the second transport roller pair 202 (step S2). Alternatively, the first transport roller pair 201 may rotate in the direction opposite to the transport direction. The first guide member 203 is positioned in the closed state. Then, the control unit 290 determines whether or not the registration sensor 220 is turned on, that is, whether or not the downstream end of the sheet S has passed immediately before the sensor surface of the registration sensor 220 (step S3). If control unit 290 determines that registration sensor 220 is not turned on (NO in step S3), control unit 290 repeats the determination again.

  When the control unit 290 determines that the registration sensor 220 is turned on (YES in step S3), the downstream end of the sheet S in the sheet conveyance direction D1 passes immediately before the sensor surface of the registration sensor 220 (FIG. 5). (See (a)). At this time, the part of the sheet S from the second conveying roller pair 202 to the roller 205 is bent upward. Thereafter, as the second conveying roller pair 202 continues to rotate, the downstream end of the sheet S in the sheet conveying direction D1 is guided downward beyond the nip line L1 by the roller 205, and further by the lower first inclined portion 210. It is guided to the nip line L1 (see FIG. 5B). In addition, by providing the rotatable roller 205, the frictional resistance between the sheet S and the first guide member 203 can be reduced.

  Further, as the second conveying roller pair 202 continues to rotate, the sheet S is fed between the first guide member 203 and the second guide member 204, along the lower first inclined portion 210, and on the upper third side. Also comes into contact with the inclined portion 208 (see FIG. 5C). As a result, the sheet S is in a state where an S-shaped first loop R10 having an upper loop R1 and a lower loop R2 is formed (step S4). At this time, one end in the width direction of the downstream end of the sheet S hits the nip portion of the first conveying roller pair 201, and then the other end in the width direction hits the nip portion of the first conveying roller pair 201, and the sheet The skew of S is corrected, and the skew correction process is completed.

  Subsequently, the control unit 290 drives the first transport motor M1 (step S5), rotates the first transport roller pair 201, and stops the first transport motor M1 after a predetermined time (step S6). ), The first conveying roller pair 201 is stopped (see FIG. 6A). That is, after the skew correction process is executed, the first conveying roller pair 201 is rotated and stopped in a state where the sheet S is sandwiched. And the control part 290 drives the guide motor M3, and displaces the 1st guide member 203 to an open state (step S7). As a result, the first guide member 203 rotates in a direction away from the nip line L1, and the second conveyance roller pair 202 conveys the sheet S, thereby causing the sheet S to move to the first guide member 203 and the second conveyance roller. The skew return prevention process (skew return prevention mode) is performed to bend toward the open space Sp between the pair 202 (see FIG. 6B).

  Further, as the rotation of the second conveying roller pair 202 continues, the sheet S protrudes upward from the space Sp, and the sheet S is in a state where a second loop R20 that is largely bent upward is formed (step S8). FIG. 6 (c)). At this time, the conveyance speed of the second conveyance roller pair 202 is set faster than the conveyance speed of the first conveyance roller pair 201. While the conveyance distance L from the second conveyance roller pair 202 to the first conveyance roller pair 201 is conveyed, a second loop R20 is formed on the sheet S between the second conveyance roller pair 202 and the first conveyance roller pair 201. (Sheet S has a loop shape). The sheet S is conveyed while turning (twisting) in the second loop 20, whereby the skew is corrected and the skew return prevention process is completed. The amount of bending of the upper loop R1 and the lower loop R2 of the first loop 10 of the sheet S formed by the skew correction process is the amount of bending of the second loop R20 of the sheet S formed by the skew return prevention process. Smaller than. Thereby, the frictional resistance between the sheet S and each of the guide members 203 and 204 in the skew correction process can be reduced.

  Thereafter, the first conveyance motor M1 is driven (step S9), the first conveyance roller pair 201 is rotated, and the sheet S is conveyed downstream (see FIG. 7A). The control unit 290 determines whether or not the registration sensor 220 is turned off, that is, whether or not the upstream end of the sheet S has passed immediately before the sensor surface of the registration sensor 220 (step S10). When control unit 290 determines that registration sensor 220 is not turned off (NO in step S10), control unit 290 repeats the determination again.

  When the control unit 290 determines that the registration sensor 220 is turned off (YES in step S10), the upstream end of the sheet S in the sheet conveyance direction D1 passes immediately before the sensor surface of the registration sensor 220 (FIG. 7). (See (b)). For this reason, the control part 290 drives the guide motor M3 and displaces the 1st guide member 203 to a closed state (step S11). Thereafter, the sheet S is discharged from the skew feeding correction device 200, and the process ends.

  As described above, according to the skew feeding correction apparatus 200 of the present embodiment, the first guide member 203 and the second guide member 204 are provided to bend the conveyed sheet S to both sides of the nip line L1. For this reason, the friction resistance between the sheet S and each of the guide members 203 and 204 can be reduced as compared with the case where the sheet S is greatly bent only on one side to generate a large friction resistance between the guide member, Frictional resistance with the guide members 203 and 204 when correcting the skew of the sheet S can be suppressed.

  Further, according to the skew correction device 200 of the present embodiment, skew correction can be realized by forming the first loop 10 by bending the sheet S into an S shape by the two guide members 203 and 204. At the same time, by opening the first guide member 203, it is possible to prevent the skew return during sheet conveyance.

  Here, narrowing the roller pitch in order to realize a compact size and low cost makes it difficult to secure the loop amount and may cause deterioration in resist performance or wrinkles due to skewing. . On the other hand, according to the skew correction device 200 of the present embodiment, the skew correction is performed in a limited space while the rear end of the sheet S is nipped between the main body discharge roller pair 160, thereby achieving a compact size. Low cost can be realized.

  In the above-described skew correction device 200, the case where the skew correction device 200 has the control unit 290 and the control unit 290 controls operations such as the skew correction processing of the sheet has been described. Without being limited thereto, the skew feeding correction device 200 may not include the control unit 290. In this case, the control unit 190 of the image forming apparatus 100 controls operations such as processing of the skew feeding correction apparatus 200.

DESCRIPTION OF SYMBOLS 1 ... Image forming system, 100 ... Image forming apparatus, 200 ... Skew correction | amendment apparatus (sheet conveyance apparatus), 201 ... 1st conveyance roller pair, 202 ... 2nd conveyance roller pair, 203 ... 1st guide member, 204 ... 1st 2 guide members, 205 ... rollers (rotating bodies), 206 ... upper first inclined part (first guide part), 210 ... lower first inclined part (second guide part), D1 ... sheet conveying direction, L1 ... nip Wire (first nip line), L2 ... nip line (second nip line), S ... sheet.

Claims (11)

A first conveyance roller pair that conveys a sheet; and a second conveyance roller pair that is disposed upstream of the first conveyance roller pair in the sheet conveyance direction and capable of conveying the sheet to the first conveyance roller pair; While the first conveying roller pair is stopped, the second conveying roller pair is rotated to convey the sheet, and the downstream end of the sheet is brought into contact with the nip of the first conveying roller pair to correct the skew of the sheet. A sheet conveying apparatus capable of executing a skew feeding correction mode,
They are arranged on opposite sides of the first nip line that is the nip line of the first conveying roller pair, and are conveyed from the second conveying roller pair to the first conveying roller pair when the skew feeding correction mode is executed. A first guide member and a second guide member that respectively bend the sheet to be bent on both sides of the first nip line,
A sheet conveying apparatus. In the skew correction mode, the first guide member contacts the sheet to form a loop toward the first guide member, and the second guide member contacts the sheet and the second guide member Form a loop to the side of the
The sheet conveying apparatus according to claim 1. In the skew correction mode, the first guide member contacts the sheet to form an upward loop, and the second guide member contacts the sheet to form a downward loop.
The sheet conveying apparatus according to claim 1. The first guide member includes a first guide portion that guides the sheet conveyed from the second conveyance roller pair by bending the sheet toward the opposite side beyond the first nip line.
The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is a sheet conveying apparatus. In the first guide portion, at least a part of the downstream side portion in the sheet conveying direction is disposed closer to the second guide member than the first nip line.
The sheet conveying apparatus according to claim 4. The first guide portion has a rotation axis along each rotation axis direction of each roller of the first conveyance roller pair, and rotates following the conveyed sheet at a downstream side portion in the sheet conveyance direction. With possible rotating bodies,
The sheet conveying apparatus according to claim 4, wherein the sheet conveying apparatus is a sheet conveying apparatus. The second guide member includes a second guide portion that guides the sheet conveyed from the first guide member by bending the sheet toward the first nip line.
The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is a sheet conveying apparatus. The second conveying roller pair is disposed with a second nip line inclined toward the first guide member with respect to the first nip line.
The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is a sheet conveying apparatus. The first guide member is provided to be rotatable around a rotation axis along each rotation axis of each roller of the first conveyance roller pair at a downstream side portion in the sheet conveyance direction,
After execution of the skew feeding correction mode, the first conveying roller pair rotates and stops in a state where the sheet is sandwiched, and the first guide member rotates in a direction away from the first nip line, The second conveyance roller pair executes a skew return prevention mode in which the sheet is conveyed to bend the sheet toward an open space between the first guide member and the second conveyance roller pair. Is possible,
The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is a sheet conveying apparatus. Each deflection amount of the sheet loop formed in the skew correction mode is smaller than the deflection amount of the sheet loop formed in the skew return prevention mode,
The sheet conveying apparatus according to claim 9. An image forming apparatus for forming an image on a sheet;
The sheet conveying apparatus according to any one of claims 1 to 10, wherein the sheet conveying apparatus corrects skew of a sheet image-formed by the image forming apparatus.
An image forming system characterized by that.

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