JP2020011820A - Sheet conveying device and image forming apparatus - Google Patents

Abstract

To provide a sheet conveying device and an image forming apparatus capable of preventing image failure.SOLUTION: A sheet conveying device comprises: a paper dust collection pad 54 which comes into contact with a surface 52b of a paper dust collection roller 52a at a first position A; and a backflow prevention pad 55 which can be brought into contact with the surface 52b of the paper dust collection roller 52s at a second position B which is located downstream of a conveyance nip N1 and upstream of the first position A in the arrow R1 direction. The sheet conveying device also comprises a contact/separation mechanism 56 for bringing the backflow prevention pad 55 into contact with the surface 52b of the paper dust collection roller 52a and separating it therefrom. The contact/separation mechanism 56 separates the backflow prevention pad 55 from the surface 52b of the paper dust collection roller 52a in a closed state in which an opening/closing door is closed and brings the backflow prevention pad 55 into contact with the surface 52b of the paper dust collection roller 52a in an open state in which the opening/closing door is open.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sheet conveying device for conveying a sheet and an image forming apparatus including the same.

  In general, an electrophotographic printer transfers a toner image formed on a photosensitive drum to a sheet fed from a cassette, fixes the toner image on the sheet, and discharges the sheet outside the apparatus. Debris such as paper dust may adhere to the sheet due to rubbing between the conveying roller and the separation pad, etc., and the paper dust adheres to the photosensitive drum and toner provided in the image forming unit, thereby reducing image quality. It causes a decline.

  Conventionally, an image forming apparatus including a first paper dust removing roller that contacts a sheet to capture paper dust on the sheet, and a first sponge member that scrapes paper dust attached to the first paper dust removing roller is known. It has been proposed (see Patent Document 1). In this image forming apparatus, when the first paper dust removing roller is rotating in the normal rotation direction, the paper dust is scraped by the first sponge member, but when the first paper dust removing roller is rotated in the reverse rotation direction. In addition, there is a possibility that the paper dust scraped off by the first sponge member flows back to the transport path. For this reason, a first reverse conveyance prevention member that scrapes paper dust from the first paper dust removal roller upstream of the first sponge member in the normal rotation direction of the first paper dust removal roller is provided. When the first paper dust removal roller rotates in the reverse direction, the paper dust is scraped off by the first reverse conveyance prevention member.

  Further, between the first paper dust removing roller and the first reverse conveyance prevention member, the first sponge member prevents scraping of the paper dust when the first paper dust removing roller is rotating in the normal rotation direction. A slight gap is provided so as not to do so. This gap allows the paper dust to be conveyed toward the first sponge member when the first paper dust removal roller is rotating in the normal rotation direction, and the second paper dust removal roller is rotated in the reverse rotation direction. In this case, the conveyance of paper dust toward the conveyance path in a certain amount of lump is restricted.

JP 2003-267579 A

  However, the first reverse conveyance prevention member described in Patent Literature 1 can restrict the conveyance of a large lump of paper dust. It may slip through. For this reason, there is a possibility that the paper dust that has slipped through the gap adheres to the photosensitive drum and the toner, causing image defects.

  Therefore, the present invention solves the above-described problem by causing the second contact member to contact the surface of the rotating body when the rotating body may rotate in the direction opposite to the first direction in which the sheet is conveyed. And an image forming apparatus.

  The present invention provides, in a sheet conveying apparatus, an apparatus main body, an opening / closing member that is openably and closably supported by the apparatus main body, a rotating body, and an opposing member that forms a conveying nip with the rotating body with respect to the rotating body. A transport unit that transports a sheet in the transport nip when the rotating body rotates in a first direction, a first contact member that contacts a surface of the rotating body at a first position, A second contact member capable of contacting the surface of the rotating body at a second position downstream of the transport nip and upstream of the first position in a direction, and connecting the second contact member to the rotating body of the rotating body. A contact / separation mechanism for contacting / separating from the surface, wherein the contact / separation mechanism separates the second contact member from the surface of the rotating body in the first state in which the opening / closing member is closed, In the second state in which the opening / closing member is opened There are, to abut the second abutment member to the surface of the rotating body, characterized in that.

  Further, the present invention is directed to a sheet conveying apparatus, wherein an apparatus main body, a sheet storage portion provided to be attachable to and withdrawable from the apparatus main body and configured to store sheets, a rotating body, and the rotating body with respect to the rotating body. An opposing member that forms a conveyance nip with the body, a conveyance unit that conveys a sheet stored in the sheet storage unit in the conveyance nip when the rotating body rotates in a first direction, and the rotation unit A first abutting member that abuts on a surface of the body at a first position, and is capable of abutting on the surface of the rotating body at a second position downstream of the transport nip and upstream of the first position in the first direction; A second contact member, and a contact / separation mechanism configured to contact / separate the second contact member from / to the surface of the rotating body. In the first state attached Then, the second contact member is separated from the surface of the rotating body, and the second contact member is attached to the surface of the rotating body in the second state in which the sheet storage unit is pulled out from the apparatus main body. Abutting.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the image defect resulting from the adhering substance adhering to the member with which the image forming part is provided can be suppressed.

FIG. 1 is an overall schematic diagram illustrating a printer according to a first embodiment. FIG. 1 is an overall schematic diagram showing a printer when an opening / closing door is opened. (A) is sectional drawing which shows the skew correction part when an opening / closing door is closed, (b) is sectional drawing which shows the skew correction part when an opening / closing door is open. FIG. 6 is an overall schematic diagram illustrating a printer when a feeding cassette according to a second embodiment is pulled out. (A) is a sectional view showing the paper dust collecting mechanism when the feeding cassette is mounted, and (b) is a cross-sectional view showing the paper dust collecting mechanism when the feeding cassette is pulled out.

<First embodiment>
〔overall structure〕
First, a first embodiment of the present invention will be described. The printer 1 as an image forming apparatus is an electrophotographic laser beam printer that forms a monochrome toner image. As shown in FIG. 1, the printer 1 includes a sheet feeding device 20 that feeds the stacked sheets, and a sheet feeding device 40 that feeds the sheet fed by the sheet feeding device 20. The sheet conveying device 40 includes a sheet conveying path 41 that guides the sheet, a plurality of rollers that convey the sheet in the sheet conveying path 41, and the printer main body 2 as an apparatus main body that covers the sheet conveying path 41 and the rollers. ing. The printer 1 includes an image forming unit 10 that forms an image on a sheet conveyed by the sheet conveying device 40, a fixing device 30 that fixes an image transferred to the sheet, and a discharge that can discharge the sheet to a discharge tray 36. And a roller pair 35.

  When an image forming command is input to the printer 1, an image forming process by the image forming unit 10 is started based on image information input from an external computer or the like connected to the printer 1, and an image is formed by the control unit 100. An image signal is created based on the information. The control unit 100 includes a CPU 101, and a memory 102 having a ROM 102a for storing a program for controlling each unit and a RAM 102b for temporarily storing data. The CPU 101 is connected to each drive source, a sensor, and the like via an input / output circuit, exchanges signals with each unit, and controls operation.

  The image forming unit 10 includes a process cartridge 12, a laser scanner 11, and a transfer roller 16. The process cartridge 12 has a photosensitive drum 13, a charging roller 14, a developing roller 15, and a cleaning blade (not shown) arranged along the photosensitive drum 13. The photosensitive drum 13 and the transfer roller 16 form a transfer nip T1. The laser scanner 11 irradiates the photosensitive drum 13 with laser light based on the created image signal. At this time, the photosensitive drum 13 is charged in advance by the charging roller 14, and an electrostatic latent image is formed on the photosensitive drum 13 by being irradiated with the laser beam. Thereafter, the electrostatic latent image is developed by the developing roller 15, and a monochrome toner image is formed on the photosensitive drum 13.

  The sheet S is fed from the sheet feeding device 20 in parallel with the above-described image forming process. The sheet feeding device 20 has a feeding cassette 21 that can be attached to and pulled out from the printer main body 2 and that can store sheets. The sheet feeding device 20 has a sheet S stacked on the feeding cassette 21 in a feeding direction. The downstream side is supported by the middle plate 22. The middle plate 22 is urged upward by a spring (not shown). The intermediate plate 22 is pressed downward by a cam (not shown) against the urging force of a spring every time one sheet is fed. The sheet S supported by the middle plate is fed by the feed roller 23, and the sheet S fed by the feed roller 23 is separated by the feed roller 23 and the separation pad 24 contacting the feed roller 23. Separated one by one.

  The sheet conveyance device 40 includes a skew correction unit 50 including a registration roller (registration roller) 51 and a paper dust collection roller 52a that contacts the registration roller 51 to form a conveyance nip N1. The skew of the sheet S is corrected by the skew correcting unit 50 by the leading end of the sheet S being abutted against the transport nip N1. . The skew feeding correction unit 50 has a paper dust collection mechanism 52 that collects paper dust as an adhering substance attached to the surface of the sheet S, and the paper dust collection roller 52 a is a part of the paper dust collection mechanism 52. Is composed. In the present embodiment, the skew feeding correcting section 50 forms a transport section, the paper dust collecting roller 52a forms a rotating body, and the registration roller 51 forms an opposing member.

  In the transfer nip T1, the toner image on the photosensitive drum 13 is electrostatically transferred to the sheet S by the transfer bias applied to the transfer roller 16. The residual toner remaining on the photosensitive drum 13 is collected by a cleaning blade. The sheet S to which the toner image has been transferred is conveyed to the fixing device 30. In the fixing device 30, the sheet S is heated and pressed by the heating device 31 and the pressing roller 32, and the toner image on the sheet S is fixed on the sheet S. The sheet S that has passed through the fixing device 30 is discharged to a discharge tray 36 by a discharge roller pair 35.

  As shown in FIG. 2, the printer 1 has an opening (not shown) that communicates with the inside of the printer main body 2 so that the inside of the printer main body 2 can be accessed in order to perform a sheet removing operation or the like when a sheet jam occurs. And an opening / closing door 3 that covers the opening. The opening / closing door 3 as an opening / closing member is supported by the printer main body 2 so as to be openable and closable, and covers the opening when closed, and exposes the opening when opened. By opening the door 3, the user can remove the jammed sheet, for example, in the transport nip N <b> 1.

  Further, the printer 1 is provided with an opening / closing detection unit 60 as a state detection unit that detects opening / closing of the opening / closing door 3. The control unit 100 uses the open / close detection unit 60 to determine which of a closed state as the first state in which the door 3 is closed and an open state as the second state in which the door 3 is open. judge.

[Details of paper dust collection mechanism]
Next, the paper dust collecting mechanism 52 will be described in detail with reference to FIGS. FIG. 3A is a cross-sectional view showing the skew feeding correcting unit 50 in the closed state, and FIG. 3B is a cross-sectional view showing the skew feeding correcting unit 50 in the open state. The paper dust collection mechanism 52 includes a paper dust collection roller 52a, a paper dust collection pad 54 as a first contact member, a backflow prevention pad 55 as a second contact member, and a part of the paper dust collection roller 52a. And a cover member 53 that covers the paper dust collection pad 54 and the backflow prevention pad 55. The paper dust collecting roller 52a is in contact with the paper dust collecting pad 54 at the first position A on the front surface 52b, and rotates during printing in the arrow R1 direction as the first direction for conveying the sheet. It is charged by sliding with respect to. The paper dust conveyed from the sheet feeding device 20 together with the sheet S is removed from the sheet S by attaching to the surface 52b of the charged paper dust collection roller 52a. The paper dust adhering to the front surface 52b is scraped off by the paper dust collection pad 54 which is constantly in contact with the front surface 52b, and is collected in the paper dust collection area S1 provided between the cover member 53 and the internal components. .

  The paper dust collecting mechanism 52 is configured such that the backflow prevention pad 55 can abut on the surface 52b, and has a contact / separation mechanism 56 for bringing the backflow prevention pad 55 into and out of contact with the surface 52b. The contact / separation mechanism 56 has a backflow prevention pad 55 attached to an end 58a, and is swingably supported at the end 58b opposite to the end 58a via the shaft 57 with respect to the printer body 2. The swing arm 58 is provided. As shown in FIG. 3 (a), the swing arm 58 is in a position where the backflow prevention pad 55 is separated from the front surface 52b, and as shown in FIG. 3 (b), the backflow prevention pad 55 contacts the paper dust collecting roller 52a. It swings between the abutting position and the abutting position. When the swing arm 58 is located at the contact position, the backflow prevention pad 55 contacts the surface 52b at the second position B downstream of the transport nip N1 and upstream of the first position A in the direction of arrow R1. The contact / separation mechanism 56 has an actuator 59 for swinging the swing arm 58, and is configured to be able to move the backflow prevention pad 55 via the swing arm 58 by the power of the actuator 59. I have.

  Here, the operation of the contact / separation mechanism 56 will be described in detail. When the door 3 is in the closed state, the swing arm 58 is stopped at the separated position. When the user opens the door 3 and the door 3 is in the open state, the control unit 100 detects the open state by the open / close detection unit 60. The control unit 100 operates the actuator 59 based on the detection to move the swing arm 58 in the direction of the arrow R2 to the contact position, thereby bringing the backflow prevention pad 55 into contact with the front surface 52b. Further, when the user closes the door 3 and the door 3 is closed, the control unit 100 detects the closed state by the open / close detection unit 60. The controller 100 operates the actuator 59 based on the detection to move the swing arm 58 to the separated position, thereby separating the backflow prevention pad 55 from the front surface 52b.

  As described above, the backflow prevention pad 55 is separated from the front surface 52b when the door 3 is in the closed state, so that when the skew feeding correcting unit 50 rotates in the direction of the arrow R1 in which the sheet S is normally conveyed, 52b. Therefore, the backflow prevention pad 55 does not hinder the paper dust scraping operation of the paper dust collection pad 54.

  Further, when a sheet jam occurs and the user opens the opening / closing door 3 and pulls out the sheet remaining in the sheet conveying path 41, the paper dust collecting roller 52a may rotate in the direction opposite to the arrow R1. In this case, the paper dust scraped off by the paper dust collection pad 54 may ride on the paper dust collection roller 52a and head toward the transport nip N1. However, in the printer 1, when the opening / closing door 3 is in the open state, the backflow prevention pad 55 abuts on the front surface 52b, and the paper dust on the paper dust collection roller 52a can be reliably removed. In addition, since the backflow prevention pad 55 abuts on the front surface 52b without any gap, it is possible to scrape small-sized paper powder such as filler (for example, calcium carbonate or talc) contained in the sheet S. Image defect can be prevented. Further, since the paper dust on the paper dust collection roller 52a is scraped off, the slip of the sheet S in the transport nip N1 can be reduced, and image defects such as image shift in the transfer nip T1 can be prevented. .

  In addition, since the structure for bringing the backflow prevention pad 55 into and out of contact with the surface 52b has a simple mechanical and electrical configuration, the paper dust collecting mechanism 52 can be provided at low cost and with high reliability.

  In addition, in the printer 1 according to the first embodiment, the backflow prevention pad 55 is configured to move in conjunction with the opening and closing of the opening and closing door 3 by the actuator 59, but is not limited thereto. For example, if the backflow prevention pad 55 is mechanically connected to the opening / closing door 3 and is configured to contact and separate from the paper dust collecting roller 52a in conjunction with opening / closing of the opening / closing door 3, this embodiment Not limited to

  The backflow prevention pad 55 is configured to move in conjunction with the opening and closing of the opening and closing door 3, but is configured to move in conjunction with the opening and closing of the door that closes the insertion opening of the process cartridge 12 so that it can be opened and closed. It may be. The backflow prevention pad 55 is separated from the paper dust collection roller 52a when the door that is closed during printing is closed, and is configured to contact the paper dust collection roller 52a when the door is open, The present invention is not limited to this embodiment.

<Second embodiment>
Next, a second embodiment of the present invention will be described. In addition, about the structure similar to 1st Embodiment, illustration is abbreviate | omitted or the same code | symbol is attached | subjected to a figure and description is abbreviate | omitted. In the printer 1, as shown in FIG. 1, a paper dust collecting mechanism 70 is disposed downstream of the feed roller 23 and the separation pad 24 in the sheet conveying direction. As shown in FIGS. 4, 5A and 5B, the paper dust collecting mechanism 70 includes a transport roller 71 rotatably supported by the printer body 2 and a transport nip abutting on the transport roller 71. And a paper dust collecting roller 72 for forming N2. That is, the paper dust collecting mechanism 70 forms the transport nip N2 as shown in FIG. 1 when the feeding cassette 21 is mounted in the printer body 2 as the first state. Further, the paper dust collecting mechanism 70 eliminates the transport nip N2 as shown in FIG. 4 when the feeding cassette 21 is pulled out from the printer main body 2 as the second state. Thus, by pulling out the feed cassette 21, the user can remove a sheet that has been jammed due to a jam in the transport nip N2, for example. In the present embodiment, the feed cassette 21 forms a sheet storage unit, the paper dust collecting mechanism 70 forms a conveying unit, the conveying roller 71 forms an opposing member, and the paper dust collecting roller 72 forms a rotating body. Constitute.

  Further, the paper dust collecting mechanism 70 includes a paper dust collecting pad 73 as a first contact member, a backflow prevention pad 74 as a second contact member, and a backflow prevention pad 74 on the surface 72 a of the paper dust collection roller 72. And a contact / separation mechanism 75 for contact / separation. The paper dust collecting roller 72 is in contact with the paper dust collecting pad 73 at a first position C on the front surface 72a, and rotates during printing in the direction of arrow R3 as the first direction for transporting the sheet. It is charged by sliding with respect to. The paper dust conveyed from the sheet feeding device 20 together with the sheet S is removed from the sheet S by attaching to the charged surface 72 a of the paper dust collection roller 72. The paper dust adhering to the front surface 72 a is scraped off by the paper dust collection pad 73 which is always in contact with the paper dust collection roller 72.

  The contact / separation mechanism 75 is movably supported by the feeding cassette 21 and has a support portion 76 that supports the backflow prevention pad 74. The support portion 76 has an end portion 78 a rotatably supported by the shaft portion 77, and a swing arm 78 supported swingably with respect to the feeding cassette 21, and an end portion 79 a fixed to the swing arm 78. And a branched portion 79. A backflow prevention pad 74 is attached to the branch 79 at an end 79b opposite to the end 79a. The support portion 76 has a separated position where the backflow prevention pad 74 is separated from the surface 72a as shown in FIG. 5A, and a contact position where the backflow prevention pad 74 contacts the surface 72a as shown in FIG. 5B. And rock between. When the support portion 76 is located at the contact position, the backflow prevention pad 74 contacts the surface 72a at the second position D downstream of the transport nip N2 and upstream of the first position C in the direction of arrow R3.

  The contact / separation mechanism 75 is supported by the feeding cassette 21 and has a spring 80 as an urging portion for urging the support portion 76 in the direction of arrow R4 from the separated position to the contact position. Thus, the contact / separation mechanism 75 urges the backflow prevention pad 74 toward the surface 72 a of the paper dust collection roller 72. Further, the contact / separation mechanism 75 has a stopper 81 as a pressing portion that is supported by the printer main body 2 and can abut on an end 78b of the swing arm 78 opposite to the end 78a. When the feeding cassette 21 is in the mounted state, the support portion 76 comes into contact with the stopper 81 and is restricted from moving in the direction of arrow R4 from the separated position. That is, when the feed cassette 21 is in the mounted state, the stopper 81 presses the support portion 76 to restrict the backflow prevention pad 74 from contacting the front surface 72a.

  As described above, the backflow prevention pad 74 is separated from the surface 72a of the paper dust collecting roller 72 when the feeding cassette 21 is in the mounted state, so that the paper dust collecting mechanism 70 conveys the sheet S normally. When rotating in the direction of arrow R3, it separates from surface 72a. Therefore, the backflow prevention pad 74 does not hinder the paper dust scraping operation of the paper dust collection pad 73.

  Further, when the feeding cassette 21 is in the drawn-out state, the paper dust collecting roller 72 may receive a force in the direction opposite to the arrow R3 by the user and rotate in the opposite direction. In this case, the paper dust scraped off by the paper dust collection pad 73 may ride on the paper dust collection roller 72 and head toward the sheet conveying path 41. However, in the printer 1, when the feeding cassette 21 is pulled out, the support portion 76 is separated from the stopper 81, and the backflow prevention pad 74 is placed on the surface 72 a of the paper dust collecting roller 72 by the urging force of the spring 80. Abut Thus, the backflow prevention pad 74 can reliably remove the paper dust on the paper dust collection roller 72.

  The printer 1 according to the second embodiment has a mechanical structure using a spring 80 and a stopper 81 so that the backflow prevention pad 74 moves in conjunction with the mounting and withdrawal of the feeding cassette 21. However, it is not limited to this. The printer 1 may be configured to include a detection unit that detects a mounted state and a pulled-out state of the feeding cassette 21 and an actuator that moves the backflow prevention pad 74. In this case, the actuator operates based on the detection result of the detection unit, and the backflow prevention pad 74 comes into contact with and separates from the paper dust collection roller 72.

  The printer 1 is configured such that the transport roller 71 and the stopper 81 are supported by the printer main body 2, and the paper dust collection roller 72, the support portion 76, and the spring 80 are supported by the feeding cassette 21. Not limited to For example, the printer 1 may be configured such that the paper dust collection roller 72, the support portion 76, and the spring 80 are supported by the printer main body 2, and the transport roller 71 and the stopper 81 are supported by the feeding cassette 21. Further, the printer 1 is configured such that the transport roller 71, the paper dust collecting roller 72, and the stopper 81 are supported by the printer body 2, and the support portion 76 and the spring 80 are supported by the feeding cassette 21. May be. The printer 1 is not limited to this embodiment as long as one of the printer main body 2 and the feeding cassette 21 supports the support portion 76 and the spring 80, and the other supports the stopper 81.

  In the first and second embodiments, the paper dust collecting pads 54 and 73, the backflow prevention pads 55 and 78, and the contact / separation mechanisms 56 and 75 are made of paper of a rotating body other than the paper dust collecting rollers 52a and 72. It may be provided to remove powder. For example, it may be provided to remove paper dust of the feed roller 23 and the discharge roller pair 35. The member forming the transport nip with these rotating members is not limited to a rotating member such as a roller or a belt, but may be a member that does not rotate, such as the separation pad 24.

  Further, in any of the above-described embodiments, the description has been made using the electrophotographic printer 1, but the present invention is not limited to this. For example, the present invention can be applied to an ink jet type image forming apparatus that forms an image on a sheet by discharging ink liquid from a nozzle.

1: image forming apparatus (printer), 2: apparatus main body (printer main body), 3: opening / closing member (opening / closing door), 10: image forming section, 21: sheet storage section (feed cassette), 40: sheet conveying apparatus, 50: transport unit (skew correction unit), 51: opposing member (registration roller, registration roller), 52a, 72: rotating body (paper dust collection roller), 54, 73: first contact member (paper dust collection) 55, 74: second contact member (backflow prevention pad), 56, 75: contact / separation mechanism, 59: actuator, 60: state detection unit (open / close detection unit), 70: transport unit (paper dust collection mechanism) ), 71: opposing member (transport roller), 76: support portion, 80: biasing portion (spring), 81: pressing portion (stopper), 100: control portion, N1, N2: transport nip

Claims (8)

The device body,
An opening / closing member supported by the apparatus main body so as to be capable of opening and closing,
A rotating unit, and an opposing member that forms a transport nip with the rotary body with respect to the rotary body, and a transport unit that transports a sheet in the transport nip when the rotary body rotates in a first direction. ,
A first contact member that contacts the surface of the rotating body at a first position;
A second contact member capable of contacting the surface of the rotating body at a second position downstream of the transport nip and upstream of the first position in the first direction;
A contact / separation mechanism configured to contact / separate the second contact member from / to the surface of the rotating body,
The contact / separation mechanism separates the second contact member from the surface of the rotating body in the first state in which the opening / closing member is closed, and the second state in the second state in which the opening / closing member is opened. A contact member is brought into contact with the surface of the rotating body,
A sheet conveying device, characterized in that: The opening and closing member covers an opening provided in the apparatus main body in the first state, and exposes the opening in the second state.
The sheet conveying device according to claim 1, wherein: The device body,
A sheet storage unit that is provided so as to be attachable to and can be pulled out from the apparatus main body and stores a sheet;
A rotating body, and an opposing member that forms a conveying nip with the rotating body with respect to the rotating body, wherein the rotating body rotates in a first direction and is stored in the sheet storage section at the transport nip. A conveying unit that conveys the processed sheet,
A first contact member that contacts the surface of the rotating body at a first position;
A second contact member capable of contacting the surface of the rotating body at a second position downstream of the transport nip and upstream of the first position in the first direction;
A contact / separation mechanism configured to contact / separate the second contact member from / to the surface of the rotating body,
The contact / separation mechanism separates the second contact member from the surface of the rotating body in the first state in which the sheet storage unit is mounted on the apparatus main body, and pulls the sheet storage unit out of the apparatus main body. In the performed second state, the second contact member is brought into contact with the surface of the rotating body,
A sheet conveying device, characterized in that: The contact / separation mechanism has an actuator for moving the second contact member,
A state detection unit that detects the first state and the second state;
A control unit that controls the actuator based on a state detected by the state detection unit,
The sheet conveying device according to claim 1, wherein: The conveyance unit corrects the skew of the sheet by the front end of the sheet is abutted against the conveyance nip,
The sheet conveying device according to any one of claims 1 to 4, wherein: The second contact member is supported by one of the apparatus main body and the sheet storage unit,
A support portion that is movably supported with respect to the apparatus main body and that supports the second contact member;
An urging portion for urging the support portion toward the surface of the rotating body,
A pressure that is supported by any one of the apparatus main body and the sheet storage portion and presses the support portion in the first state to restrict the second contact member from contacting the surface of the rotating body. And a part,
The support portion is separated from the pressing portion in the second state, and causes the second contact member to contact the surface of the rotating body by an urging force of the urging portion.
The sheet conveying device according to claim 3, wherein: The rotating body, the support portion and the urging portion are supported by the sheet storage portion,
The opposing member and the pressing portion are supported by the device main body,
The sheet conveying device according to claim 6, wherein: A sheet conveyance device according to any one of claims 1 to 7,
An image forming unit that forms an image on a sheet conveyed from the sheet conveying device,
An image forming apparatus comprising:

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