JP2009286560A - Sheet carrying device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet carrying device and an image forming device capable of surely preventing the winding of a sheet without damaging a first sheet carrying member. <P>SOLUTION: A winding prevention member 94 is arranged between an intermediate transfer belt 5, and a carrying belt 98 provided at a downstream side in a sheet carrying direction from the intermediate transfer belt 5 and stopped at a stop time shorter than that of the first sheet carrying member. Then, the winding prevention member 94 is pressed by a loop generated on the sheet generated by a difference in a stop time between the intermediate transfer belt 5 and the carrying belt 98, and moved toward the intermediate transfer belt so as to prevent the sheet from being wound around the intermediate transfer belt 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sheet conveying apparatus and an image forming apparatus, and more particularly to a configuration for preventing a sheet from being wound around a sheet conveying member.

  2. Description of the Related Art Conventionally, image forming apparatuses such as copying machines, printers, and facsimiles are provided with a sheet conveying apparatus that conveys a sheet. In the image forming apparatus, for example, the sheet is transported to the transfer unit that transfers the toner image formed on the image carrier by the sheet transport device, and then transported to the fixing unit, whereby the toner image is placed on the sheet. I try to fix it.

  By the way, in the conventional sheet conveying apparatus, when a conveyance failure such as a sheet jam occurs, a sheet conveying member such as a conveying belt or a conveying roller is stopped, and then a jammed sheet is processed. However, when the sheet conveying member is stopped, since the sheet conveying member has an inherent inertia force, and from the relationship of the sequence order and the like, the time until the sheet conveying member stops (hereinafter referred to as stop time). ) Is uneven.

  Here, for example, when the sheet is sandwiched between the first sheet conveying member on the upstream side and the second sheet conveying member on the downstream side, sheet jam may occur in other portions. In the case, the first sheet conveying member and the second sheet conveying member are stopped. At this time, when the stop time of the first sheet transport member is longer than the stop time of the second sheet transport member, the sheet is pushed into the second sheet transport member by the first sheet transport member.

  When the sheet is pushed in, the sheet is greatly bent and loops. When the loop grows, the loop portion of the sheet eventually winds around the first sheet conveying member. Further, if the first sheet conveying member does not stop even after the loop portion is wound, the sheet is conveyed with the loop portion wound, and as a result, the sheet is close to the first sheet conveying member, or It comes to be caught in the clearance gap between members, such as a supporting member which contact | abutted. The problem due to the variation in the stop time is particularly noticeable due to an increase in sheet conveyance speed accompanying the recent increase in the speed of image forming apparatuses.

  Therefore, conventionally, a separation claw is provided to prevent the sheet from being wrapped around the first sheet conveying member due to the loop of the sheet caused by the difference in the stop time of the first and second sheet conveying members (see Patent Document 1). ).

JP 2001-209251 A

  Here, in such a conventional sheet conveying apparatus and image forming apparatus, the separation claw is brought into contact with the first sheet conveying member to prevent the sheet from being wound around the first sheet conveying member. However, when the separation claw is brought into contact with the first sheet conveyance member in this way, the separation claw comes into contact with the first sheet conveyance member even during normal operation. It will be hurt by etc.

  In addition, when the separation claw is not brought into contact with the first sheet conveyance member and is installed close to the first sheet conveyance member, the first sheet conveyance member is not damaged, but the arrangement of the separation claw, the sheet Depending on the rigidity and the stop time difference, there may be a case where the function of preventing the winding sufficiently cannot be achieved. Further, when a brake mechanism is provided in order to reduce the difference in seat stop time, the cost increases and the apparatus becomes large.

  Therefore, the present invention has been made in view of such a current situation, and a sheet conveying apparatus and an image forming apparatus that can avoid the winding of the sheet reliably and without damaging the first sheet conveying member. Is intended to provide.

  The present invention provides a sheet conveying apparatus that conveys a sheet, a first sheet conveying member that conveys a sheet, and a stop that is disposed downstream of the first sheet conveying member in the sheet conveying direction and is shorter than the first sheet conveying member. A second sheet conveying member that stops in time, and is disposed between the first sheet conveying member and the second sheet conveying member, and when the first sheet conveying member and the second sheet conveying member are stopped, An anti-winding member that prevents the sheet from being wound around the one-sheet conveying member, and the anti-winding member is configured to convey the first sheet when the first sheet conveying member and the second sheet conveying member are stopped. Provided movably so as to move toward the first sheet conveying member by being pressed by a loop generated in the sheet due to a difference in stop time between the member and the second sheet conveying member And it is characterized in that they are.

  As in the present invention, the wrapping preventing member is moved to the first sheet conveying member side by the loop generated in the sheet due to the difference in stop time, thereby reliably winding the sheet and scratching the first sheet conveying member. Can be avoided without

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of a color copying machine which is an example of an image forming apparatus provided with a sheet conveying apparatus according to an embodiment of the present invention.

  In FIG. 1, reference numeral 200 denotes a color copying machine, and 201 denotes a color copying machine main body (hereinafter referred to as an apparatus main body). The apparatus main body 201 is provided with an image forming unit 202, a sheet feeding unit 203 that feeds the sheet S, and a sheet conveying device 204 that conveys the sheet S fed from the sheet feeding unit 203. A reader unit 205 is provided on the upper part of the apparatus main body 201.

  Here, the reader unit 205 includes a document table glass 31, a document pressing plate 32 that can be opened and closed with respect to the document table glass 31, a light source that irradiates the image surface of the document O, and the like, and a moving optical system that scans the document. 33 and a CCD 34 which is a photoelectric conversion element (solid-state imaging element). It is also possible to adopt a configuration in which the document O is automatically fed onto the document table glass 31 by using the document crimping plate 32 as an automatic document feeder (ADF, RDF).

  Further, the image forming unit 202 is provided with an electrophotographic photosensitive drum (hereinafter referred to as a photosensitive drum) 1, a charger 2, and a laser scanner 3 as an image carrier that is rotated in the direction of arrow A by a motor (not shown). ing. Further, the image forming unit 202 is provided with a cleaner device 7 for cleaning residual toner on the photosensitive drum, a developing unit 4 and the like.

  The photosensitive drum 1 is rotationally driven in the direction of arrow A at a predetermined speed, and the surface thereof is uniformly charged to a predetermined polarity and potential by a charger 2 as a charging means. The laser scanner 3 includes a laser output unit, a polygon mirror, an imaging lens, a folding mirror, and the like, and laser light (optical signal) modulated in accordance with an image information signal input from an image processing unit (not shown). ) To scan and expose the charged surface of the rotating photosensitive drum 1.

  Then, an electrostatic latent image is formed on the surface of the photosensitive drum 1 by performing scanning exposure with the laser scanner 3 in this way. In addition to the image information read from the reader unit 205 described above, the image information signal may of course be synthesized and formed from image information transmitted from an external device such as a personal computer.

  The developing unit 4 includes a rotary 41 that rotates counterclockwise as indicated by an arrow B, a black developer 4a for full-color development mounted on the rotary 41, and yellow, magenta, and cyan developers that are not shown. It has four color developing devices.

  Further, the developing unit 4 is disposed by switching the color developing device to a developing position facing the photosensitive drum 1 by rotating the rotary 41 in a direction of an arrow at a predetermined angle at a predetermined control timing. At this developing position, the distance (SD distance) between the photosensitive drum 1 and the developing sleeve on the developing device side is maintained within a predetermined range, and each color developing device electrostatically By developing the latent image, toner images are sequentially formed on the photosensitive drum. The developing unit 4 includes a supply pipe 400 so that toner as a developer is supplied from a toner cartridge unit (not shown) as needed.

  Reference numeral 8 denotes an endless intermediate transfer belt 5 for transferring a multicolor image onto a sheet S after transferring and superposing four color toner images, and each color toner image developed on the photosensitive drum 1 is transferred to the intermediate transfer belt 5. The intermediate transfer belt unit is provided with a primary transfer roller 6 and the like for transferring to the toner.

  Here, the intermediate transfer belt 5 is an endless belt made of a dielectric material having flexibility, and is stretched around a plurality of rollers 5a to 5g. The intermediate transfer belt 5 is driven to rotate in the clockwise direction indicated by an arrow at substantially the same speed as that of the photosensitive drum 1 using, for example, a roller 5a as a driving roller.

  The outer surface of the intermediate transfer belt 5 is in contact with the photosensitive drum 1 between the rollers 5b and 5c, and this contact portion is a primary transfer nip portion T1. In the primary transfer nip T 1, a primary transfer roller 6 is disposed in contact with the inner surface of the intermediate transfer belt 5 on the side opposite to the photosensitive drum 1 side of the intermediate transfer belt 5.

  A primary transfer voltage having a polarity opposite to that of the toner is applied to the primary transfer roller 6 at a predetermined control timing, and development is performed on the photosensitive drum 1 by the application of the primary transfer voltage. The toner images of the respective colors are transferred to the intermediate transfer belt 5. The residual toner on the intermediate transfer belt 5 is provided so as to sandwich the intermediate transfer belt 5 described later, and is scraped off by a belt cleaning unit which is a cleaning unit for cleaning the intermediate transfer belt 5.

  Reference numeral 15 denotes a secondary transfer outer roller for transferring the toner image from the intermediate transfer belt 5 to the sheet S. The secondary transfer outer roller 15 is brought into contact with and separated from the intermediate transfer belt 5 by a pressure control mechanism (not shown). It is provided as possible.

  When the toner image is transferred to the sheet S, the secondary transfer outer roller 15 is intermediate to the roller 5g of the rollers 5a to 5g on which the intermediate transfer belt 5 is suspended. It moves to the 1st position which press-contacts on both sides of 5. By moving to the first position in this way, a secondary transfer nip portion T2 is formed between the outer surface of the intermediate transfer belt 5 and the second transfer nip portion T2. Further, the secondary transfer outer roller 15 moves to a second position separated from the outer surface of the intermediate transfer belt 5 during standby when the toner image is not transferred onto the sheet S.

  On the downstream side of the secondary transfer nip T2, a fixing roller 101 and a pressure belt 102 that presses against the fixing roller 101 are provided, and a fixing device 18 that fixes an unfixed image on the sheet is provided.

  The paper feed unit 203 is provided with a cassette 81 that accommodates the sheet S and is detachable from the apparatus main body 201. The sheet S stored in the cassette 81 is sent out by a pickup roller 11 and a separation roller pair 11a. The sheet feeding unit 203 includes a multi manual feed tray 85, and the sheets stored in the multi manual feed tray 85 are sent out by the pickup roller 11 and the like.

  The sheet conveying device 204 includes a registration roller 14 and a conveying belt unit 17 that conveys a sheet onto which a toner image has been transferred to the fixing unit 18 as will be described later. Here, the registration roller 14 increases the posture position accuracy of the sheet S and feeds the sheet S in a timely manner in accordance with the toner image on the intermediate transfer belt, and is provided upstream of the secondary transfer nip portion T2. It has been.

  Next, an image forming operation of the color copying machine 200 having such a configuration will be described.

  First, the original O is stacked on the original platen glass 31 with the image surface facing downward, and when the original O is pressed against the original platen glass 31 by the original pressing plate 32, the moving optical system 33 receives the original. It moves while illuminating and scans the image surface of the document. Then, the original scanning light is imaged on the CCD 34 and is color-separated and read with the three primary colors of RGB (red, green, and blue).

  Thereafter, the read RGB signals are input to an image processing unit (not shown), subjected to various image processing in the image processing unit, and then output to the laser scanner 3 as image information signals. The laser scanner 3 modulates the image information signal into an optical signal, and irradiates the modulated optical signal as a first color optical signal on the photosensitive drum through the lens and each reflection mirror. At this time, the photosensitive drum 1 is uniformly charged to a predetermined polarity and potential by the charger 2 in advance, and an electrostatic latent image is formed by irradiation with an optical signal.

  Next, the electrostatic latent image is developed by a developing unit corresponding to the selected first color among the plurality of developing units arranged in the developing unit 4 to form a first color toner image. Thereafter, the toner image formed on the photosensitive drum is transferred onto the intermediate transfer belt 5 by the primary transfer roller 6 in the primary transfer nip portion T1.

  Here, in the color mode, the intermediate transfer belt 5 onto which the toner image has been transferred further rotates so that the next toner image is formed and transferred. During this time, the developing unit 4 rotates the next designated color developing device by 90 ° in the direction of arrow B so as to face the photosensitive drum 1, and prepares to develop the next electrostatic latent image.

  After the primary transfer of the first color is completed in this way, the second color, the third color, the fourth color and the latent image, development, and primary transfer are repeated on the intermediate transfer belt 5 as in the first color. The toner images of each color are sequentially superimposed. The primary transfer residual toner that is not transferred to the intermediate transfer belt 5 and remains on the surface of the photosensitive drum 1 is removed from the surface of the photosensitive drum by the cleaner device 7. The photosensitive drum 1 whose surface is cleaned by the cleaner device 7 in this manner is repeatedly used for image formation.

  On the other hand, the paper feed roller 11 of the paper feed cassette 81 selected in advance, for example, from the paper feed cassette 81 or the multi manual feed tray 85 is driven at a predetermined control timing in parallel with such an image forming operation. . As a result, the sheet S stored in the paper feed cassette 81 is separated and sent out, and is sent from the sheet path 13 to the registration roller 14.

  At this time, the registration roller 14 is stopped, and the skew of the sheet S is corrected by contacting the registration roller 14 in the stopped state. Thereafter, the timing is adjusted by the registration roller 14 and the sheet is sent to the secondary transfer nip portion T2 constituted by the intermediate transfer belt 5 and the secondary transfer outer roller 15. At this time, the secondary transfer outer roller 15 has moved to the first position at a predetermined control timing.

  Next, the sheet S is nipped and conveyed through the secondary transfer nip portion T2. During this time, a predetermined secondary transfer voltage is applied to the secondary transfer outer roller 15, whereby a toner image having a plurality of colors on the intermediate transfer belt 5 is electrostatically collectively transferred onto the sheet S. An unfixed toner image is formed (transferred) thereon.

  The secondary transfer residual toner that is not transferred to the sheet S and remains on the surface of the intermediate transfer belt 5 is removed from the belt surface by a belt cleaning unit 16 shown in FIG. The intermediate transfer belt 5 cleaned by the belt cleaning unit 16 is repeatedly used for image formation.

  Next, the sheet S thus transferred to the secondary transfer nip T2 and having the toner image transferred by the secondary transfer outer roller 15 is separated from the surface of the intermediate transfer belt 5 and is fixed by the conveying belt unit 17 to the fixing device. 18 is conveyed. Then, the fixing device 18 is heated and pressurized, whereby the unfixed toner image is fused on the sheet S to form a fixed image. Thereafter, the sheet S on which the toner image is fixed passes through the sheet path 19 and is discharged onto the discharge tray 20 by the inner discharge roller 100 and the outer discharge roller 110.

  The color copying machine 200 has a double-sided image forming function. When images are formed on both sides of the sheet S, the sheet S is not shown after the fixing process on the first side by the fixing unit 18 is completed. The two-way path 120 is conveyed by switching the switching member. Thereafter, the sheet S is conveyed to the sheet path 13 via the double-sided path 120, sent to the secondary transfer nip T2 via the registration roller 14, and when passing through the secondary transfer nip T2, the toner image is transferred to the sheet. Transferred to the second side of S. The sheet S on which the toner image has been transferred in this manner is discharged onto the paper discharge tray 20 after the toner image is thermally fixed by the fixing unit 18.

  Incidentally, FIG. 2 is a diagram showing a configuration in the vicinity of the secondary transfer nip portion T2. As shown in FIG. 2, a post-secondary transfer guide 99 is disposed downstream of the secondary transfer nip portion T <b> 2, and a conveyance belt unit 17 is further disposed downstream of the secondary post-transfer guide 99. Here, an endless conveyance belt 98 is wound around the surface of the conveyance belt unit 17, and a suction fan 97 is disposed inside the conveyance belt 98 so as to face the path of the sheet S. .

  In FIG. 2, reference numeral 16 denotes a belt cleaning unit. The belt cleaning unit 16 is disposed at a position facing the roller 5a with the intermediate transfer belt 5 interposed therebetween. The belt cleaning unit 16 is always kept in a state of being separated from the outer surface of the intermediate transfer belt 5 so as not to hinder the rotation of the intermediate transfer belt 5. Further, when the secondary transfer of the toner image from the intermediate transfer belt 5 to the sheet S is performed at the secondary transfer nip portion T2, the state is switched to a state of contacting the outer surface of the intermediate transfer belt 5 at a predetermined control timing.

  By the way, the belt cleaning unit 16 is provided with a wrap prevention unit 93 for preventing the sheet S from being wound. In other words, the wrapping prevention unit 93 is the intermediate transfer belt 5 that is the first sheet conveyance member that conveys the sheet S, and the conveyance belt 98 that is the second sheet conveyance member disposed on the downstream side of the intermediate transfer belt 5 in the sheet conveyance direction. Between.

  The wrapping prevention unit 93 includes a wrapping prevention member 94 that is maintained at a certain distance from the intermediate transfer belt 5, and a fixing member 95 that supports the wrapping prevention member 94. In this embodiment, the wrapping prevention member 94 is a sheet-like member having a thickness of 130 μm and formed of, for example, a PET film, and the leading end of the wrapping prevention member 94 extends from the intermediate transfer belt 5. It is arranged at a position separated by 3 mm (predetermined distance). The fixing member 95 is made of sheet metal.

  Here, as shown in FIG. 3, an anti-winding member 94 is attached to the end portion 95 a of the fixing member 95 with a double-sided tape 96. Then, by attaching the anti-roll member 94 to the fixing member 95 with the double-sided tape 96 in this manner, the anti-wind member 94 can be fixed with a simple configuration, and the cost can be reduced.

  The end portion 95a of the fixing member 95 is bent. The bending angle of the end portion 95a is set so that the front end of the anti-winding member 94 is offset by 3 mm from the intermediate transfer belt 5 when the anti-winding member 94 is attached to the fixing member 95 with the double-sided tape 96. Has been. Further, the fixing member 95 is used as a temporary placement table for the intermediate transfer belt unit 8 and the belt cleaning unit 16 during unit maintenance.

  Here, the anti-winding member 94 attached to the fixing member 95 is on the intermediate transfer belt side (first sheet conveying direction) which is a direction in which the clearance with the intermediate transfer belt 5 is reduced when pressure is applied by a loop generated in the sheet S. It has a configuration (movable configuration) that bends to the member side.

  Next, the wrapping prevention operation of the wrapping prevention unit 93 including the wrapping prevention member 94 configured as described above will be described.

  Normally, as described above, the sheet S is nipped and conveyed by the secondary transfer nip portion T2 to transfer the toner image, and then the conveying belt while the back surface is adsorbed by the suction fan 97 installed in the conveying belt unit 17. It is guided by 98 and conveyed to the fixing device 18.

  By the way, when a sheet jam occurs in the main body of the apparatus when the sheet S exists in the secondary transfer nip T2 to the conveyance belt unit 17, the conveyance belt 98 and the intermediate transfer belt 5 are stopped from a controller (not shown). Signal is output.

  Here, when a command is sent to turn off the drive signals for the transport belt 98 and the intermediate transfer belt 5, the transport belt 98 and the intermediate transfer belt (ITB) 5 try to stop and the speed is stopped as shown in FIG. Gradually goes down.

  In the present embodiment, since the inertial force of the conveyance belt 98 is smaller, the conveyance belt 98 stops before the intermediate transfer belt 5, and then the intermediate transfer belt 5 having a large inertial force is delayed and stopped. . For this reason, when the conveyance belt 98 and the intermediate transfer belt 5 are stopped, a speed difference occurs between the conveyance belt 98 and the intermediate transfer belt 5 until the stop, and between the conveyance belt 98 and the intermediate transfer belt 5. A difference in stop time occurs.

  On the other hand, the conveyance belt 98 and the intermediate transfer belt 5 are arranged at a distance shorter than the length of the sheet in the sheet conveyance direction, and the downstream side of the sheet S is adsorbed to the conveyance belt 98 by the suction fan 97.

  Therefore, the sheet S is pushed by the upstream intermediate transfer belt 5 as shown in FIG. 5A, and as a result, a loop occurs in the sheet S. Thereafter, the loop further grows due to the difference in speed and stop time between the conveying belt 98 and the intermediate transfer belt 5, and the loop portion Sr of the sheet eventually comes into contact with the anti-winding member 94 from below. Until the loop portion Sr comes into contact, the clearance b between the tip of the anti-roll member 94 and the intermediate transfer belt 5 is 3 mm, which is the state at the time of installation.

  Here, when the loop further grows thereafter, the loop portion Sr pushes up the anti-winding member 94 as shown in FIG. 5B and presses the anti-winding member 94 in the direction of narrowing the interval with the intermediate transfer belt 5. Will come to do. When pressed by the loop portion Sr in this way, the wrapping prevention member 94 is flexible and thus bends in the direction of narrowing the clearance b with the intermediate transfer belt 5.

  As a result, the clearance b 'becomes smaller than the clearance b at the time of installation shown in FIG. 5A, or becomes 0, so that the path where the sheet S is wound by the intermediate transfer belt 5 can be narrowed or blocked. When the clearance b ′ becomes small or becomes 0 as described above, the sheet S is buckled as shown in FIG. 5C, so that the belt cleaning unit is in a state where the sheet S is wound around the intermediate transfer belt 5. 16 can be prevented from entering.

  The wrapping prevention member 94 is not in contact with the intermediate transfer belt 5 during normal operation, and the wrapping prevention member 94 is flexible and soft, and thus damages the intermediate transfer belt 5. There is no. Further, since the anti-roll member 94 is a soft material, even when the anti-roll member 94 and the intermediate transfer belt 5 come into contact with each other during assembly, the risk of scratching the intermediate transfer belt 5 is reduced.

  As described above, in this embodiment, the wrapping prevention member 94 can be moved to the intermediate transfer belt 5 side by the loop generated in the sheet due to the difference in the stop time between the conveyance belt 98 and the intermediate transfer belt 5. Thereby, the winding of the sheet S around the intermediate transfer belt 5 can be avoided reliably and without damaging the intermediate transfer belt 5.

  In the above description, the intermediate transfer belt 5 has been described as an example of the first sheet conveying member. However, when the secondary transfer unit is configured by the intermediate transfer drum and the secondary transfer outer roller, the intermediate transfer belt 5 may be The transfer drum serves as the first sheet conveying member. Further, when the first sheet conveying member is the fixing roller 101 and the pressure belt 120 shown in FIG. 1 and the second sheet conveying member is the inner paper discharge roller 100, by using the wrapping preventing member 94 described above, It is possible to prevent the sheet from being wound around the fixing roller 101 or the like.

  In the above description, the electrophotographic image forming apparatus (copier) has been described as an example. However, the present invention can also be applied to an ink jet type or offset printing type image forming apparatus.

1 is a diagram illustrating a schematic configuration of a color copying machine that is an example of an image forming apparatus including a sheet conveying device according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a configuration in the vicinity of a secondary transfer nip portion of the color copying machine. The figure explaining the structure of the winding prevention part provided in the said secondary transfer nip part vicinity. FIG. 4 is a diagram showing a time transition of a motor drive signal and a speed of a conveyance belt and an intermediate transfer belt 5 when a jam occurs in the color copying machine. The figure explaining the winding prevention operation | movement of the said winding prevention part.

Explanation of symbols

5 Intermediate transfer belt 8 Intermediate transfer belt unit 15 Secondary transfer outer roller 16 Belt cleaning unit 17 Conveying belt unit 93 Anti-winding portion 94 Anti-winding member 95 Fixing member 96 Double-sided tape 98 Conveying belt 101 Fixing roller 120 Pressure belt 200 Color copying Machine 202 Image forming section S Sheet T2 Secondary transfer nip section

Claims (5)

In a sheet conveying apparatus that conveys a sheet,
A first sheet conveying member for conveying a sheet;
A second sheet conveying member disposed on the downstream side in the sheet conveying direction of the first sheet conveying member and stopping in a shorter stop time than the first sheet conveying member;
It is arranged between the first sheet conveying member and the second sheet conveying member, and when the first sheet conveying member and the second sheet conveying member are stopped, the sheet is wound around the first sheet conveying member. An anti-winding member to prevent,
The winding preventing member is a loop generated in the sheet due to a difference in stop time between the first sheet conveying member and the second sheet conveying member when the first sheet conveying member and the second sheet conveying member are stopped. A sheet conveying apparatus, wherein the sheet conveying apparatus is movably provided so as to be moved by being pressed by the first sheet conveying member.   The sheet conveying apparatus according to claim 1, wherein the wrapping prevention member is attached to the fixing member with a predetermined distance from the first sheet conveying member.   3. The sheet conveying apparatus according to claim 1, wherein the wrapping preventing member is formed of a flexible sheet-like member so as to bend toward the first sheet conveying member by pressing by a loop generated in the sheet. .   A cleaning unit that contacts the first sheet conveying member and cleans the first sheet conveying member is provided, and the loop preventing portion enters between the cleaning unit and the first sheet conveying member by the wrapping prevention unit. The sheet conveying apparatus according to any one of claims 1 to 3, wherein the sheet is prevented from being wound around the first sheet conveying member by preventing the sheet from being formed.   An image forming apparatus comprising the sheet conveying device according to claim 1.

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