JP5195222B2 - Sheet transport device - Google Patents

Description

  The present invention relates to a sheet conveying apparatus that conveys a sheet.

  In an image forming apparatus, a printing machine, or the like, a sheet conveying apparatus that conveys sheets as image recording media one by one is used. As an example of a sheet conveying apparatus that is frequently used, there is a sheet conveying apparatus that includes a conveying roll that is rotationally driven by a driving device and a pressing roll that is disposed so as to face the contacting roll and to be rotated in contact with the conveying roll. In such a sheet conveying apparatus, a sheet is sandwiched between a conveying roll and a pressing roll, and the recording sheet is conveyed by rotating the conveying roll.

  Some of the transport rolls are rotationally driven in one direction, and some are rotationally driven in both directions. For example, in an image forming apparatus that uses both sides of a sheet, the sheet conveyance direction is reversed after an image is formed on one side of the sheet. A sheet that conveys a sheet to an upstream side of an image forming position is widely used. In such an image forming apparatus, at a position where the sheet conveying direction is reversed, the conveying roll of the sheet conveying apparatus rotates in both directions.

An example of such a sheet conveying apparatus is described in Patent Document 1.
In this sheet conveying apparatus, a kick roll (corresponding to the pressing roll) is urged toward the peripheral surface of the conveying roll by a spring which is an elastic member. Then, the recording sheet is sandwiched between contact portions of the transport roll and the kick roll, and the recording sheet is discharged onto the stacking tray by the rotation of the transport roll.
JP 2006-193263 A

The pressing roll that is driven in contact with the transport roll may move in the axial direction along with the rotation due to the accuracy such as the distribution of contact pressure and the parallelism of the axial line. When the pressing roll moves in the axial direction as described above, the position of the sheet to be conveyed is shifted in a direction perpendicular to the conveyance direction, or the sheet to be conveyed is skewed with respect to the conveyance direction.
In the case where the pressing roll is supported by the elastic member, it is conceivable that a regulating member that regulates displacement is brought into contact with the elastic member, thereby suppressing the movement of the pressing roll in the axial direction. However, even when such a restricting member is provided, if the force to move in the axial direction of the pressing roll increases, the contact between the restricting member and the elastic member may be released and the restriction may be released. Further, when there is a manufacturing error in the elastic member, the contact between the regulating member and the elastic member may be easily released.

  An object of this invention is to provide the sheet conveying apparatus which can maintain the state by which the movement of the axial direction of a press roll is suppressed.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a peripheral surface is in contact with a sheet and is driven to rotate to convey the sheet, and is rotatably supported between the conveyance rolls. A pressing roll that sandwiches the sheet, an elastic support member that presses the pressing roll against the transport roll, a support base that supports the elastic support member, and the pressing roll is displaced in the axial direction of the pressing roll. A regulating member for regulating, the elastic support member being provided at a holding portion held by the support base, a protruding portion protruding from the holding portion, and a tip portion of the protruding portion, and the pressing roll A bearing portion that supports the rotation support shaft, wherein the restricting member contacts the overhanging portion and restricts displacement of the overhanging portion, and the overhanging portion includes the restriction member. To a position in contact, with an enlarged contact portion to expand the range of contact with the restricting member protrudes in a direction along the contact surface of the regulating member, the enlarged contact portion is proximate the conveyor rolls of the pressing roll direction Alternatively, the present invention provides a sheet conveying apparatus that moves with a movement in a backward direction .

The invention according to claim 2 includes a guide unit that guides a recording sheet that is supported by the support base and is fed between the transport roll and the pressing roll in the sheet transport device according to claim 1 , The said restriction member shall be provided in the said guide part .

The invention according to claim 3 is the sheet conveying apparatus according to claim 1 or 2 , wherein the enlarged contact portion is convex or looped so as to protrude the wire in a direction along the contact surface of the regulating member. It shall be bent into

The invention according to claim 4 is the sheet conveying apparatus according to claim 1, claim 2 or claim 3 , wherein the regulating member is a curved surface having a convex tip end surface that contacts the protruding portion of the elastic support member. Suppose that

The invention according to claim 5 is the sheet conveying apparatus according to claim 3 , wherein the regulating member has a protruding portion protruding in an axial direction of the pressing roll, and the protruding portion is a convex shape of the enlarged contact portion. Or it shall penetrate inside the looped part.

A sixth aspect of the present invention is an image forming apparatus including the sheet conveying device according to any one of the first to fifth aspects.

According to invention of Claim 1 or Claim 2, compared with what does not have an expansion contact part in the overhang | projection part of an elastic support member, the state by which the movement of the axial direction of a press roll is suppressed can be maintained. it can.

According to invention of Claim 3, compared with what does not have this structure, an expansion contact part can be formed easily.

According to the invention described in claim 4, the resistance when the pressing roll is displaced in the direction approaching or retreating from the transport roll in a state where the overhanging portion is regulated by the regulating member does not include this configuration. Compared to that, it is reduced.

According to the fifth aspect of the present invention, the contact between the restricting member and the elastic member is less likely to come off than in the case where this configuration is not provided.

According to the invention described in claim 6, it is possible to provide an image forming apparatus having the sheet conveying apparatus according to any one of claims 1 to 5 .

Hereinafter, embodiments of the invention according to the present application will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an image forming apparatus provided with a sheet conveying apparatus according to an embodiment of the present invention.
The image forming apparatus includes a photoconductive drum 1 having a photoconductive layer formed on the outer peripheral surface of a cylindrical member made of a conductive material. Around the photoconductive drum 1, the surface of the photoconductive drum 1 is provided. A charging device 2 that uniformly charges the photosensitive drum 1, an exposure device 3 that irradiates the charged photosensitive drum 1 with image light to form a latent image on the surface by a difference in electrostatic potential, and a latent image on the photosensitive drum 1. A rotary developing unit 4 that forms a toner image by transferring yellow, magenta, cyan, or black toner to the image, and an endless belt-like intermediate transfer belt 5 to which the toner image formed on the photosensitive drum is transferred. And a cleaning device 6 for removing the toner remaining on the photosensitive drum.

  The intermediate transfer belt 5 is stretched by a plurality of rolls and driven so as to move around. The toner on the photosensitive drum 1 is located at a position facing the photosensitive drum 1 inside the intermediate transfer belt 5. A primary transfer roll 7 for primary transfer of the image to the intermediate transfer belt 5 is provided. A secondary transfer roll 8 and a transfer facing roll 9 are disposed opposite to the secondary transfer roll 8 on the downstream side of the primary transfer position in the moving direction of the intermediate transfer belt. A recording sheet is fed from the sheet tray 15 or the manual feed tray 16 through the conveyance path 17 to a region where the rolls 8 and 9 are pressed against each other with the intermediate transfer belt 5 interposed therebetween, and the recording sheet is pressed against the intermediate transfer belt 5. The toner image on the intermediate transfer belt 5 is transferred to the sheet.

On the downstream side of the position where the transfer facing roll 9 and the secondary transfer roll 8 face each other in the conveyance direction of the recording sheet, a fixing device 10 that heats an unfixed toner image on the recording sheet and presses it against the recording sheet; A sheet conveying device 30 that discharges the sheet to the sheet discharge tray 18 is provided. Further, a branch path 21 is provided in the conveyance path 20 from the fixing device 10 to the paper discharge tray 18, and when an image is recorded on both sides, the recording sheet conveyance direction by the sheet conveyance device 30 is reversed, so It feeds into the transport path 22 for use. Then, the recording sheet is conveyed from the duplex conveying path 22 to the upstream side of the position where the secondary transfer roll 8 is provided.
A cleaning device 19 for removing toner remaining on the intermediate transfer belt is provided on the downstream side of the secondary transfer position in the circumferential movement direction of the intermediate transfer belt 5.

  The photosensitive drum 1 is obtained by forming an organic photosensitive layer on the peripheral surface of a cylindrical member made of metal, and the metal portion is electrically grounded.

  The charging device 2 includes a roll-shaped member in which a stainless steel cylindrical core metal is covered with a medium resistance rubber, and the surface of the photosensitive drum 1 is applied by applying a voltage in which an AC component is superimposed on a DC component. Is charged to a desired voltage.

  The exposure device 3 generates flashing laser light based on an image signal, and scans this in the main scanning direction (axial direction) of the photosensitive drum 1 by a polygon mirror. As a result, the potential of the portion of the photosensitive drum 1 where the laser light is illuminated is attenuated, and an electrostatic latent image corresponding to an image of each color is formed on the surface of the photosensitive drum 1 due to the difference in electrostatic potential.

  The rotating type developing unit 4 includes a rotating holder 4e that is driven to rotate, and four developing devices 4a, 4b, 4c, and 4d that store toners of yellow, magenta, cyan, and black, When the rotary holder 4e is driven to rotate, any one of the developing devices 4a, 4b, 4c, and 4d is selected and disposed in a region facing the photosensitive drum 1.

  The intermediate transfer belt 5 is a film-like member formed from a synthetic resin such as flexible PET or polyimide. Then, the photosensitive drum 1 is wound around a predetermined area around the outer peripheral surface of the photosensitive drum 1 to come into contact with the photosensitive drum 1 in a wrap shape, and transfer is performed in a wide contact range. The range in which the intermediate transfer belt 5 is in contact with the photosensitive drum 1 is formed by pressing between two rolls in contact with the inner side of the intermediate transfer belt 5 against the surface of the photosensitive drum in a state where tension is introduced. Yes. That is, a wrap-in roll 11 is provided on the upstream side of the primary transfer roll 7 in the rotation direction of the photosensitive drum 1 to press the intermediate transfer belt 5 against the photosensitive drum, and a wrap-out roll 12 is provided on the downstream side of the primary transfer roll 7. The intermediate transfer belt is pressed against the photosensitive drum 1. In addition to the wrap-in roll 11 and the wrap-out roll 12, a transfer facing roll 9 that faces the secondary transfer roll 8 and support rolls 13 and 14 are disposed inside the intermediate transfer belt 5. It is stretched so that it can go around.

  The secondary transfer roll 8 is formed in a roll shape by forming an outer peripheral portion with a conductive rubber material on a metal core, and a bias voltage for transfer is applied between the transfer facing roll 9. It is what is done.

  As shown in FIG. 2, the fixing device 10 includes a heating roll 10 a that has a built-in heating source and is driven to rotate, a pressure belt 10 b that is disposed so that the outer peripheral surface is in contact with the heating roll 10 a, and a heating roll. And a pressure pad 10c for pressing the pressure belt 10b against 10a. The recording sheet sent between the heating roll 10a and the pressure belt 10b pressed against each other is heated and pressed to fix the toner image on the recording sheet.

  The sheet conveying device 30 is provided on the downstream side of the fixing device 10, and as shown in FIGS. 3 and 4, a conveyance roll 31 that is rotationally driven and a pressure that is disposed to face the conveyance roll 31. A roll 32, an elastic support member 40 that supports the pressing roll 32, a regulating member 33 that regulates the displacement of the elastic supporting member 40, and a recording sheet that is fed into a nip portion where the conveying roll 31 and the pressing roll 32 are in contact with each other. The guide rib 34 and the elastic support member 40 are supported by the support base 35. Further, the support shaft 31a of the transport roll is supported in a non-uniform position with respect to the support base 35 and is rotationally driven.

  As shown in FIG. 5, the transport roll 31 is arranged such that its axis is in the width direction of the recording sheet S to be transported, and a plurality of cylinders made of rubber or synthetic resin on a metal support shaft 31a. The body 31b is fixed at intervals. Then, the recording sheet is rotated in a direction specified by a driving source (not shown), and the recording sheet that comes into contact is conveyed by the conveyance roll 31 being rotated.

  The pressing roll 32 is provided for each cylindrical body 31b of the conveying roll 31, and a cylindrical body 32b made of rubber having a predetermined width is supported on a metal shaft 32a that is a rotation support shaft. And it is supported so that it can rotate freely, and is pressed against the transport roll 31 by the elastic repulsive force of the elastic support member 40. Accordingly, the recording sheet S is smoothly conveyed to the paper discharge tray 18 or the double-sided conveyance path 22 following the rotation of the conveyance roll 31.

  The support base 35 is continuous with the frame that supports the heating roll 10 a and the pressure pad 10 c of the fixing device 10, and supports the elastic support member 40. A plurality of guide ribs 34 for guiding the recording sheet to the nip portion between the conveying roll 31 and the pressing roll 32 are provided so as to be continuous with the support base 35.

The guide rib 34 is a plate-like member provided substantially perpendicular to the axial direction of the transport roll 31 and the pressing roll 32. And two guide ribs 34a and 34b are arrange | positioned facing the both sides of the elastic support member 40 which supports the press roll 32, respectively. Further, as shown in FIG. 5, guide ribs 34 can be provided between the plurality of pressing rolls 32.
A mounting portion 36 for attaching the elastic support member 40 is provided on the surfaces of the guide ribs 34 facing each other across the elastic support member 40 so as to protrude in parallel with the axis of the pressing roll 32. Further, a regulating member 33 for regulating the displacement of the pressing roll 32 in the axial direction is provided so as to be convex from the same surface. The restricting member 33 comes into contact with the elastic support member 40 to restrict the displacement when the pressing roll 32 is displaced.

  The elastic support member 40 is a spring formed by bending a series of steel wire rods, and has a torsion spring portion 41 that is spirally wound into a torsion spring. A pair is provided on the same axis. And the rotation constrained part 42 which protruded from the end of each torsion spring part 41 wound helically becomes a mutually continuous thing. The torsion spring portion 41 has a mounting portion 36 protruding from the guide rib 34 inserted inside the wire wound spirally, and is supported so as to be rotatable around the axis of the mounting portion 36. Further, the rotation constrained portion 42 is in contact with the support base portion 35 so that the rotation of the torsion spring portion 41 is constrained. That is, the torsion spring portion 41 and the rotation constrained portion 42 function as a holding portion that is held by the support base 35.

  From the other end of the pair of torsion spring portions 41, an overhang portion 43 is provided so as to protrude toward the transport roll 31, and a bearing portion 44 that supports the shaft 32a of the pressing roll 32 is provided at the tip portion. This bearing part 44 winds the wire which continues with the overhang | projection part 43 helically, and inserts and supports the shaft 32a of the press roll 32 inside it.

  The overhang portion 43 has an enlarged contact portion 43 a between the torsion spring portion 41 and the bearing portion 44. The enlarged contact portion 43a is formed by bending in a convex shape in a direction along the contact surface 33a of the regulating member 33 abutted from the side, and as shown in FIG. 3, the contact surface of the regulating member 33 33a and the overhang | projection part 43 become a shape which contacts in a wide range.

  The elastic support member 40 having such a configuration is configured to support the pressing roll 32 supported by the bearing portion 44 by the elastic repulsive force due to the torsional deformation of the torsion spring portion 41 and the elastic repulsive force when the overhang portion 43 is bent. It is assumed that both rolls 31 and 32 come into contact with and rotate on the circumferential surface of the transport roll 31.

  The regulating member 33 projects toward the projecting portion 43, and the contact surface 33a at the tip that contacts the projecting portion 43 is a convex curved surface. Thereby, the overhanging portion 43 that is in contact with the regulating member 33 can move smoothly along the contact surface 33a. That is, the pressing roll 32 can be easily moved in the direction approaching or retreating from the transport roll 31, and the influence of the elastic support member 40 on the force that biases the pressing roll 32 is reduced.

  In such a sheet conveying device 30, the recording sheet discharged from the fixing device 10 is sent to the contact position between the conveying roll 31 and the pressing roll 32 while being guided by the guide rib 34 through the conveying path 20. Then, it is transported by the rotational drive of the transport roll 31 and discharged to the paper discharge tray 18. Further, when an image is formed on the back side of the recording sheet, the conveying roll 31 and the pressing roll 32 rotate in opposite directions before the recording sheet passes through the contact position between the conveying roll 31 and the pressing roll 32, and branch. Through 21, the recording sheet is fed into the duplex conveying path 22.

When the pressing roll 32 is displaced in the axial direction when being rotationally driven in this manner, the protruding portion of the elastic support member 40 comes into contact with the regulating member 33 and the displacement of the pressing roll 32 in the axial direction is regulated. Thus, the pressing roll 32 is restrained from moving in the axial direction while being driven to rotate by the transport roll 31, and the occurrence of so-called side registration deviation and paper skew is restrained.
Note that the side registration misalignment is a state in which the sheet is deviated in a direction perpendicular to the sheet conveying direction, and is likely to occur when the pressing roll 32 moves in the axial direction. Also, the paper skew is that the sheet is conveyed while being inclined with respect to the sheet conveying direction.

  Further, the overhanging portion 43 of the elastic support member 40 is provided with an enlarged contact portion 43 a that is in contact with a wide area of the regulating member 33. As a result, even if the overhanging portion 43 is strongly pressed against the contact surface of the restricting member 33 by a force for moving the pressing roll 32 in the axial direction, even if displacement occurs along the contact surface, the elastic support by the restricting member 33 is achieved. This prevents the member 40 from being deregulated. As a result, the state in which the movement of the pressing roll 32 in the axial direction is regulated by the regulating member 33 is maintained, and the side registration deviation and the paper skew are stably suppressed.

Next, a sheet conveying apparatus according to a second embodiment of the present invention will be described.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and description is abbreviate | omitted.
FIG. 6 is a schematic side view of a sheet conveying apparatus according to the second embodiment, and FIG. 7 is a schematic plan view. The sheet conveying apparatus 50 includes the same conveying roll 31 as in the embodiment shown in FIGS. 3 and 4, a pressing roll 32, a regulating member 33, a guide rib 34, and a support base that supports the guide rib 34 and the elastic support member 60. 35, the elastic support member 60 of the present embodiment is different from the embodiment shown in FIG.
As shown in FIGS. 6 and 7, the protruding portion 63 of this embodiment is bent in a direction along the contact surface of the regulating member 33 and has a loop shape. The enlarged contact portion 63a in a loop shape comes into contact with the regulating member 33 in a wide area.

In such a sheet conveying apparatus, similarly to the sheet conveying apparatus shown in FIGS. 3 and 4, the regulating member 33 and the overhanging portion 63 come into contact with each other in a wide area, and the contact between the overhanging portion 63 and the regulating member 33 is released. Is suppressed.
Note that the torsion spring portion 61, the rotationally restrained portion 62, and the bearing portion 64 of the elastic support member 60 have the same shape as the elastic support member 40 shown in FIGS.

FIG. 8 is a schematic plan view of a sheet conveying apparatus according to the third embodiment, and FIG. 9 is a schematic side view.
The sheet conveying apparatus 70 includes the same conveying roll 31 as the sheet conveying apparatus 30 shown in FIGS. 3 and 4, a pressing roll 32, a guide rib 34, and a support base 35 that supports the guide rib 34 and the elastic support member 80. Although provided, the shapes of the enlarged contact portion 83a and the regulating member 73 provided on the overhang portion 83 of the elastic support member 80 are different from those of the embodiment shown in FIG.

  The enlarged contact portion 83a provided on the overhang portion 83 of the elastic support member 80 is bent into a loop shape as shown in FIGS. The restricting member 73 protruding from the side surface of the guide rib 34 has a first protruding portion 73a and a second protruding portion 73b further protruding from substantially the center of the first protruding portion. It has a cylindrical shape having an axis. The diameter of the first protrusion 73a is larger than the diameter of the second protrusion 73b, and the diameter of the enlarged contact part 83a in the loop state is smaller than the diameter of the first protrusion 73a. And the diameter of the 2nd protrusion part 73b is smaller than the loop diameter of the expansion contact part 83a, and is inserted in the loop of this expansion contact part 83a.

  With the configuration as described above, the enlarged contact portion 83a of the overhang portion 83 is allowed to move along the distal end surface of the first projecting portion 73a, and displacement is restricted in the axial direction of the pressing roll 32. Further, since the second projecting portion 73b is inserted into the loop of the enlarged contact portion 83a, the range in which the overhanging portion 83 can move along the distal end surface of the first projecting portion 73a is limited, and the elasticity The protruding portion 83 of the support member 80 is prevented from being detached from the restricting member 73. Therefore, when the pressing roll 32 is driven and rotated by the conveying roll 31, it is possible to stably suppress the movement of the pressing roll 32 in the axial direction, and to suppress the occurrence of a side registration deviation of the recording sheet and a paper skew.

  In addition, the invention which concerns on this application is not limited to said embodiment. For example, the shape of the enlarged contact portion is not limited to a convex shape or a loop shape, and other shapes may be adopted as long as the contact area with the regulating member is increased. Further, the shape of the regulating member may be various shapes as long as it can regulate the movement of the pressing roll in the axial direction without restricting the movement of the pressing roll in the advancing / retreating direction with respect to the conveying roll. Can be adopted. For example, the shape of the pressing roll when projected in the axial direction may be a shape that is vertically long or circular, a shape that is long in the lateral direction, a rectangle, an oval, or a droplet. Moreover, the front end surface protruding toward the protruding portion of the elastic support member may be a flat surface or a curved surface.

On the other hand, the structure for supporting the protruding portion of the elastic support member is not limited to a continuous torsion spring as in the above embodiment, and other structures can be appropriately employed. Also, when using a series of wires, other shapes can be used.
The bearing portion that supports the rotation support shaft of the pressing roll is not limited to one in which a wire is wound in a spiral shape, and a bearing that supports a separately manufactured bearing at the tip of the overhanging portion can be employed.
In the invention according to the present application, the medium to be conveyed may be a sheet, and may be not only an image forming apparatus such as a copying machine or a printer, but also an automatic cash deposit / withdrawal machine (so-called ATM).

1 is a schematic configuration diagram of an image forming apparatus provided with a sheet conveying apparatus according to an embodiment of the present invention. FIG. 2 is a schematic configuration diagram illustrating a fixing device, a sheet conveyance device, and a double-side conveyance path provided in the image forming apparatus illustrated in FIG. 1. It is a schematic side view which shows the support structure of the press roll with which the sheet conveying apparatus shown in FIG. 2 was equipped. It is a schematic plan view which shows the support structure of the press roll shown in FIG. It is a schematic front view which shows arrangement | positioning of the conveyance roll and press roll of the sheet conveying apparatus shown in FIG. It is a schematic side view of the sheet conveying apparatus which is 2nd Embodiment of the invention which concerns on this application. It is a schematic plan view of the sheet conveying apparatus which is 2nd Embodiment of the invention which concerns on this application. It is a schematic side view of the sheet conveying apparatus which is 3rd Embodiment of the invention which concerns on this application. It is a schematic plan view of the sheet conveying apparatus which is 2nd Embodiment of the invention which concerns on this application.

1: photosensitive drum, 2: charging device, 3: exposure device, 4: development unit,
5: Intermediate transfer belt, 6: Cleaning device, 7: Primary transfer roll, 8: Secondary transfer roll, 9: Transfer opposing roll, 10: Fixing device, 11: Wrap-in roll, 12: Wrap-out roll, 13, 14 : Support roll, 15: sheet tray, 16: manual feed tray, 17, 20: transport path, 18: paper discharge tray, 19: cleaning device for intermediate transfer belt, 21: branch, 22: duplex transport path,
30: Sheet conveying device, 31: Conveying roll, 32: Pressing roll, 33: Restricting member, 34: Guide rib, 35: Support base, 36: Mounting part,
40: elastic support member, 41: torsion spring portion of the elastic support member, 42: rotation restrained portion of the elastic support member, 43: overhang portion of the elastic support member, 43a: expansion contact portion, 44: bearing portion of the elastic support member ,
50: Sheet conveying device, 60: Elastic support member, 61: Torsion spring portion of the elastic support member, 62: Rotation restrained portion of the elastic support member, 63: Overhang portion of the elastic support member, 64: Bearing portion of the elastic support member ,
70: sheet conveying device, 73: restriction member, 73a: first protrusion of the restriction member, 73b: second protrusion of the restriction member, 80: elastic support member, 81: torsion spring part of elastic support member, 82 : Rotation restricted portion of elastic support member, 83: Overhang portion of elastic support member, 84: Bearing portion of elastic support member

Claims (6)

A conveying roll whose circumferential surface is in contact with the sheet and is rotationally driven to convey the sheet;
A pressing roll supported rotatably and having a sheet sandwiched between the conveying rolls;
An elastic support member that presses the pressing roll against the transport roll;
A support base for supporting the elastic support member;
A regulating member that regulates displacement of the pressing roll in the axial direction of the pressing roll;
The elastic support member includes a holding portion that is held by the support base, a protruding portion that protrudes from the holding portion, and a bearing portion that is provided at a distal end portion of the protruding portion and supports the rotation support shaft of the pressing roll. With
The restricting member is configured to restrict the displacement of the overhanging portion in contact with the overhanging portion,
The overhang portion includes an enlarged contact portion that extends in a direction along the contact surface of the restriction member and expands a range in contact with the restriction member at a position in contact with the restriction member,
The enlarging contact portion moves in accordance with the movement of the pressing roll in a direction approaching or retreating from the conveyance roll . Supported by the support base, and having a guide portion for guiding a recording sheet fed between the transport roll and the pressing roll;
  The sheet conveying apparatus according to claim 1, wherein the regulating member is provided in the guide portion. The sheet according to claim 1 or 2, wherein the enlarged contact portion is formed by bending a wire rod into a convex shape or a loop shape so as to protrude in a direction along the contact surface of the regulating member. Conveying device. The sheet conveying device according to claim 1, wherein the restricting member has a convex curved surface at a tip surface that contacts the protruding portion of the elastic support member. Wherein the restricting member has a protrusion protruding in the axial direction of the pressing roll, the protruding portion, characterized in that it is penetrated into the inside of the convex or looped and portions of the enlarged contact portion Item 4. The sheet conveying apparatus according to Item 3 . An image forming apparatus comprising the sheet conveying device according to claim 1 .

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