JP2013155012A - Image forming apparatus - Google Patents

Abstract

An object of the present invention is to provide an image forming apparatus capable of improving the transportability of a discharge roller and reducing the size of the apparatus.
An image forming apparatus (laser printer 1) includes a discharge tray 9 and a discharge roller 8 that discharges a recording sheet to the discharge tray 9. The discharge roller 8 includes a driving roller 81 that rotates when a driving force is input, and a first driven roller 82 and a second driven roller 83 that are in contact with the driving roller 81 and are driven to rotate by the driving roller 81. The first driven roller 82 is disposed downstream of the second driven roller 83 in the recording sheet discharge direction, and has a diameter different from the diameter of the second driven roller 83.
[Selection] Figure 6

Description

  The present invention relates to an image forming apparatus including a discharge roller that discharges a recording sheet to a discharge tray.

  2. Description of the Related Art Conventionally, as an image forming apparatus, in order to correct a curl of paper discharged from a fixing device, a discharge roller is composed of one drive roller and two driven rollers that are driven to rotate in contact with the drive roller. Is known (see Patent Document 1). Specifically, in this technology, two driven rollers having the same diameter are arranged under the driving roller, so that the paper curled so as to be convex upward is bent so as to be convex downward. Let the curl be corrected.

JP 2006-188341 A

  However, in the prior art, since the two driven rollers have the same diameter, for example, when the two driven rollers are formed with a large diameter in order to improve the transportability of the discharge roller, the apparatus becomes large. there were. In addition, for example, when the two driven rollers are both formed with a small diameter in order to reduce the size of the apparatus, there is a problem that the transportability of the discharge roller is deteriorated.

  SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus capable of improving the transportability of the discharge roller and reducing the size of the apparatus.

An image forming apparatus that solves the problem includes a discharge tray and a discharge roller that discharges a recording sheet to the discharge tray.
The discharge roller includes a driving roller that rotates when a driving force is input, and a first driven roller and a second driven roller that contact the driving roller and rotate following the driving roller.
The first driven roller is disposed downstream of the second driven roller in the discharge direction of the recording sheet, and has a diameter different from the diameter of the second driven roller.

  According to this configuration, since the diameters of the two driven rollers are different, it is possible to improve the conveyance of the recording sheet with the larger driven roller, and it is possible to reduce the size of the apparatus with the smaller driven roller. .

  In the above-described configuration, it is desirable that the first driven roller is formed with a diameter larger than the diameter of the second driven roller.

  According to this, by increasing the diameter of the first driven roller disposed on the downstream side in the discharge direction, the entrance angle of the recording sheet conveyed from between the second driven roller and the driving roller (the first downstream roller) 1), the recording sheet can be prevented from colliding with the first driven roller on the downstream side.

  Further, in the above-described configuration, the fixing device is disposed upstream and below the discharge direction of the recording sheet with respect to the discharge roller and thermally fixes the developer image on the recording sheet, and discharged from the fixing device. And a conveyance path for guiding the recording sheet toward the roller, the conveyance path is formed in an arc shape that protrudes upward, and the nip portion of the discharge roller is below the apex of the conveyance path. It is desirable to arrange in.

  According to this, for example, compared to a conveyance path that guides a recording sheet substantially straight toward a discharge roller disposed obliquely above the fixing device, the position of the discharge roller can be lowered by the amount of the conveyance path formed in an arc shape. Therefore, the image forming apparatus can be downsized.

  Further, in the above-described configuration, in the case of including a housing having an opening in the upper portion, and a top cover that opens and closes the opening with the end on the upstream side in the discharge direction of the recording sheet rotatably supported by the housing Preferably, the top cover is provided with a discharge tray and a driving roller, and the housing is provided with a first driven roller and a second driven roller.

  According to this, the recording sheet jammed between the driving roller and the driven roller can be easily taken out simply by opening the top cover.

  In the above configuration, when the top cover is provided below the discharge roller and has a vertical wall that constitutes a part of the discharge tray, the direction from the second driven roller to the first driven roller is It is desirable that the first driven roller and the second driven roller are arranged side by side in a direction inclined with respect to the horizontal plane so as to be obliquely downward.

  According to this, compared with a structure in which, for example, two driven rollers are arranged side by side in the horizontal direction, it is possible to reduce the amount of protrusion of the first driven roller relative to the drive roller to the downstream side in the discharge direction. Therefore, even if the position of the vertical wall is shifted to the upstream side in the discharge direction as compared with the case where the protrusion amount becomes large, the interference between the vertical wall and the first driven roller can be prevented, and as a result, the discharge tray can be widened. it can.

  According to the present invention, it is possible to improve the transportability of the discharge roller and to reduce the size of the apparatus.

1 is a cross-sectional view illustrating a laser printer according to an embodiment of the present invention. It is a perspective view which shows the state which has arrange | positioned the tray cover in the extended position. It is a perspective view which shows the state which has arrange | positioned the tray cover in the covering position. It is a figure which shows the II sectional drawing of FIG. 3 simply. It is sectional drawing which shows a mode that a user rotates the top cover a little and visually recognizes the inside of an apparatus main body. It is an expanded sectional view which shows the structure around a discharge roller. It is the figure which expands and shows the discharge roller which concerns on this embodiment, and the figure which showed the form which made the downstream driven roller smaller than the upstream driven roller.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, first, the overall configuration of a laser printer as an example of an image forming apparatus will be described, and then the features of the present invention will be described in detail.

  In the following description, the direction will be described with reference to the user when using the laser printer. That is, in FIG. 1, the left side toward the paper surface is “front side”, the right side toward the paper surface is “rear side”, the rear side toward the paper surface is “left side”, and the front side toward the paper surface is “right side”. To do. In addition, the vertical direction toward the page is defined as the “vertical direction”.

  As shown in FIG. 1, the laser printer 1 includes an apparatus main body 2, a feeder unit 3 for feeding a sheet P as an example of a recording sheet, and an image forming unit 4 for forming an image on the sheet P. It has.

  The apparatus main body 2 includes a housing 21, a top cover 22, and a front cover 23. The casing 21 has an opening 21A for attaching and detaching a process cartridge 6 to be described later in the upper part thereof, and an insertion port 21B (see FIG. 2) for inserting the paper P in the front part thereof.

  The upper opening 21 </ b> A of the housing 21 is opened and closed by the top cover 22, and the front insertion port 21 </ b> B is opened and closed by the front cover 23. The detailed structure of the top cover 22 and the front cover 23 will be described later.

  The feeder unit 3 includes a paper feed tray 31 on which the paper P is placed, and a paper feed mechanism 32 that feeds the paper P on the paper feed tray 31 toward the image forming unit 4.

  The paper feed tray 31 is configured by a tray portion 31 </ b> A disposed at the lower portion of the apparatus main body 2 and the above-described front cover 23. Specifically, the front cover 23 can swing back and forth around the lower end portion, and constitutes a part of the paper feed tray 31 in a state of being tilted forward.

  In the feeder unit 3, the front cover 23 is tilted forward to form the paper feed tray 31, and then the paper P is placed on the paper feed tray 31. The paper P on the paper feed tray 31 is supplied to the image forming unit 4 by the paper feed mechanism 32.

  The image forming unit 4 includes a scanner unit 5, a process cartridge 6, and a fixing device 7.

  The scanner unit 5 is provided on the front side in the apparatus main body 2 and includes a laser light emitting unit, a polygon mirror, a lens, a reflecting mirror, and the like (not shown). In the scanner unit 5, a laser beam is irradiated on the surface of a photosensitive drum 61 described later by high-speed scanning.

  The process cartridge 6 can be attached to and detached from the housing 21 through the opening 21 </ b> A, and mainly includes a photosensitive drum 61 and a transfer roller 62 that transfers a toner image (developer image) on the photosensitive drum 61 onto the paper P. . The process cartridge 6 is provided with a known charger (not shown), a developing roller, a layer thickness regulating blade, a toner storage chamber, and the like.

  In the process cartridge 6, the surface of the rotating photosensitive drum 61 is uniformly charged by a charger and then exposed by high-speed scanning of a laser beam from the scanner unit 5. As a result, the potential of the exposed portion is lowered, and an electrostatic latent image based on the image data is formed on the surface of the photosensitive drum 61.

  Next, the toner in the toner storage chamber is supplied to the electrostatic latent image on the photosensitive drum 61 by the developing roller, and a toner image is formed on the surface of the photosensitive drum 61. Thereafter, the paper P is transported between the photosensitive drum 61 and the transfer roller 62, whereby the toner image carried on the surface of the photosensitive drum 61 is transferred onto the paper P.

  The fixing device 7 is disposed above the process cartridge 6 and mainly includes a heating roller 71 (heating member) and a pressure roller 72 (backup member).

The heating roller 71 is a member that heats the paper P, and a heat source (not shown) such as a halogen lamp is provided inside thereof.
The pressure roller 72 is a member that sandwiches and conveys the paper P with the heating roller 71 and is provided obliquely above the heating roller 71.

  In the fixing device 7 configured as described above, the toner transferred onto the paper P is thermally fixed while the paper P passes between the heating roller 71 and the pressure roller 72. The paper P thermally fixed by the fixing device 7 is conveyed to a discharge roller 8 disposed on the downstream side of the fixing device 7, and is discharged from the discharge roller 8 onto a discharge tray 9.

<Detailed structure around the top cover>
Next, the structure around the top cover 22 will be described in detail.
As shown in FIGS. 1 and 2, the top cover 22 mainly includes a first wall portion 22A, a second wall portion 22B, a third wall portion 22C, a discharge tray 9, a tray cover 10, and a discharge. A part of the roller 8 (a driving roller 81 described later) is provided.

  The first wall portion 22 </ b> A is a wall disposed above the discharge roller 8 and is formed to extend horizontally from the rear end of the housing 21 to a position slightly ahead of the discharge roller 8. Below the first wall portion 22A (between the rear end portion of the top cover 22 and a vertical wall 91 described later), the fixing device 7 is provided. Specifically, the fixing device 7 is disposed on the rear side (upstream side in the discharge direction) and below the discharge roller 8. In other words, the nip portion between the heating roller 71 and the pressure roller 72 is disposed behind and below the nip portion between the driving roller 81 and the driven rollers 82 and 83 described later. Yes.

  In this fixing device 7, the heating roller 71 is disposed on the front side with respect to the pressure roller 72, and the sheet P discharged from the fixing device 7 faces the surface of the heating roller 71 in contact with the discharge tray 9. The paper is discharged onto the discharge tray 9. Thereby, there is a high possibility that the paper P discharged onto the discharge tray 9 is curled so as to protrude upward.

  The second wall portion 22B is a wall disposed obliquely below and in front of the first wall portion 22A, and is formed in a U shape surrounding the discharge tray 9 (specifically, the front end and the left and right ends). Yes. The upper surface B1 of the second wall 22B is inclined forward and obliquely downward (obliquely downward toward the downstream side in the discharge direction).

  As shown in FIGS. 3 and 4, the upper surface 10A of the tray cover 10 located at a covering position described later is flush with the upper surface B1 of the second wall portion 22B inclined in this way. . Thereby, since it can suppress that a level | step difference is produced between the tray cover 10 located in the covering position, and the 2nd wall part 22B of the circumference | surroundings, the laser printer 1 when the tray cover 10 is located in the covering position can be suppressed. It is possible to enhance the design.

  As shown in FIGS. 1 and 2, the third wall portion 22C is a wall that connects the first wall portion 22A and the second wall portion 22B, and intersects the first wall portion 22A and the second wall portion 22B. Extending in the direction. That is, the top cover 22 is formed in a shape such that the second wall portion 22B near the discharge tray 9 is lowered by one step from the first wall portion 22A. Thereby, it is possible to reduce the size of the laser printer 1 by the amount that the second wall portion 22B is one step lower than the first wall portion 22A.

  Further, the top cover 22 is supported by the housing 21 so that the rear end portion thereof is rotatable. In other words, the top cover 22 is supported so as to be rotatable with respect to the casing 21 around a rotation shaft 22D provided in a range overlapping with the first wall portion 22A as viewed from above.

  As a result, as shown in FIG. 5, even when the laser printer 1 is housed and used in a narrow shelf R, for example, the second wall portion 22B located on the opposite side of the rotation shaft 22D is the first wall portion 22B. Since the top cover 22 can be largely opened by a step lower than the wall portion 22A, the process cartridge 6 can be easily replaced.

  As shown in FIGS. 1 and 2, the discharge tray 9 is formed so as to be recessed downward from the upper surface of the top cover 22 (specifically, the second wall portion 22B). Specifically, the discharge tray 9 includes a vertical wall 91 that extends in the vertical direction, a horizontal wall 92 that extends in the horizontal direction, a sheet support wall 93 that is inclined with respect to a horizontal plane, and a pair of side walls 94 that are disposed on the left and right. Have.

  The vertical wall 91 constitutes a rear wall of the discharge tray 9 and is disposed under the discharge roller 8. Specifically, two cutouts 91A formed so as to be recessed downward are formed in the upper part of the vertical wall 91 with a space in the left-right direction, and a part of the discharge roller 8 ( A first driven roller 82, which will be described later, enters.

  The lower end portion of the vertical wall 91 is an inclined portion 91B that extends obliquely downward to the front (obliquely downward toward the tip end side of the top cover 22), and the deepest portion of the discharge tray 9 is on the front side of the vertical wall 91. It is supposed to be arranged in. As a result, as shown in FIG. 5, when the user opens the top cover 22 and visually recognizes, for example, the vicinity of the exit of the fixing device 7 (structure on the rotating shaft 22D side of the top cover 22), Compared to a structure (structure indicated by a broken line) in which the deepest portion is set at the lower end of the vertical wall extending vertically, the deepest portion of the discharge tray 9 is less likely to obstruct the line of sight. Therefore, in the structure of the present embodiment, it is possible to easily perform jam processing and the like by visually recognizing the vicinity of the exit of the fixing device 7 without opening the top cover 22 too much.

  As shown in FIG. 1, the horizontal wall 92 extends from the lower end of the inclined portion 91 </ b> B toward the front side and is connected to the sheet support wall 93, and is the deepest portion of the discharge tray 9. In other words, the horizontal wall 92 is provided between the seat support wall 93 and the inclined portion 91B.

  The sheet support wall 93 is formed so as to incline forward obliquely from the horizontal wall 92 (deepest part). That is, the sheet support wall 93 and the inclined portion 91B are formed so that the distance from each other gradually increases from the horizontal wall 92 toward the upper side, thereby constituting a part of the wall of the V-shaped groove. doing.

  Thus, when the rear end of the paper P discharged to the discharge tray 9 is placed on the inclined portion 91B, the rear end portion of the paper P is projected downward by the inclined portion 91B and the sheet support wall 93. It can be bent. Thereby, even when the paper P discharged onto the discharge tray 9 is curled so as to protrude upward, a portion on the rear end side of the paper P between the inclined portion 91B and the sheet support wall 93. By being corrected to a shape that protrudes downward, it is possible to correct the curled shape that protrudes upward to a relatively flat shape.

  In particular, in this embodiment, by providing the horizontal wall 92 between the seat support wall 93 and the inclined portion 91B, for example, compared to a structure in which the seat support wall and the inclined portion are directly connected without providing a horizontal wall. A narrow corner is not formed between the sheet support wall 93 and the inclined portion 91B. Therefore, it is possible to prevent the paper from entering the narrow corners so that the curl shape of the paper is corrected too much, and thus the curl shape of the paper P can be corrected well.

  The side walls 94 are disposed on the left and right sides of the vertical wall 91, the horizontal wall 92, and the seat support wall 93, and are formed so as to connect the left and right ends of each of the walls 91 to 93.

  As shown in FIGS. 1 to 3, the tray cover 10 is supported by the casing 21 so as to be rotatable about a rotation shaft (not shown) disposed near the front end of the sheet support wall 93. ing. Specifically, the tray cover 10 includes a covering position that covers the upper surface of the discharge tray 9 (the upper surface of the sheet support wall 93 and a part of the horizontal wall 92) and the front side of the upper surface of the discharge tray 9 (the upper surface of the sheet support wall 93). It is possible to rotate (movable) to an extended position adjacent to.

  The other part of the horizontal wall 92 and the inclined part 91B are covered with the third wall part 22C and the first wall part 22A of the top cover 22. Therefore, when the tray cover 10 is disposed at the covering position, the tray cover 10, the third wall portion 22C, and the first wall portion 22A can suppress the accumulation of dust in the discharge tray 9. .

  The rear end portion 10B of the tray cover 10 at the covering position (the upstream end portion in the discharge direction of the paper P) is a nip portion of the discharge roller 8 (a nip between a driving roller 81 and a first driven roller 82 described later). Part). Accordingly, even when the tray cover 10 is located at the covering position, the paper P discharged from the nip portion of the discharge roller 8 can pass over the tray cover 10, so that the paper P can be removed from the tray cover 10. It is possible to suppress clogging due to contact with the lower surface.

  Further, at the covering position, the upper surface of the tray cover 10 is inclined forward and obliquely downward (obliquely downward toward the downstream side in the discharge direction). As a result, even if dust accumulates on the tray cover 10 located at the covering position, it is possible to suppress the dust from falling to the corner on the rear side (discharge roller 8 side) of the discharge tray 9.

  Further, as shown in FIG. 2, the tray cover 10 includes a first extension cover 11 and a second extension cover 12. The first extension cover 11 has a width (length in the left-right direction) that is substantially the same as the width of the discharge tray 9 and, as shown by a two-dot chain line in FIG. It is formed to extend from a position on the front side of the front end of the wall 93 to a position on the rear side of the front end of the third wall portion 22C.

  Specifically, a notch C1 (see FIG. 2) formed so as to be recessed upward is formed at the lower end of the third wall portion 22C, and the rear end of the first extension cover 11 is at the covering position. In addition, it is located behind the edge of the notch C1.

  As shown in FIG. 2, the second extension cover 12 is formed narrower than the first extension cover 11, and is provided rotatably at a substantially central portion of the front end portion of the first extension cover 11 located at the extension position. It has been. Specifically, the second extension cover 12 is folded in such a manner as to face the first extension cover 11 and an open position adjacent to the front side of the upper surface of the first extension cover 11 located at the extension position (see FIG. 2). Position).

  As shown in FIG. 6, the discharge roller 8 is disposed on the vertical wall 91 of the discharge tray 9, and is mainly in contact with the drive roller 81 that rotates when a driving force is input, and the drive roller 81. The first driven roller 82 and the second driven roller 83 that are driven to rotate by the drive roller 81 are provided. The first driven roller 82 is disposed on the front side (downstream in the discharge direction) with respect to the second driven roller 83 and is formed with a diameter (different diameter) larger than the diameter of the second driven roller 83.

  As a result, the transportability of the paper P can be improved with the larger first driven roller 82, and the apparatus can be downsized with the smaller second driven roller 83. In particular, in the present embodiment, the paper P conveyed from the nip portion between the second driven roller 83 and the driving roller 81 is increased by increasing the diameter of the first driven roller 82 disposed on the downstream side in the discharge direction. Therefore, the paper P can be prevented from colliding with the first driven roller 82 on the downstream side. .

  That is, as shown in FIG. 7B, when the first driven roller 82 ′ on the downstream side in the transport direction is made smaller than the second driven roller 83 ′ on the upstream side, the driving roller 81 and the second driven roller 83. The angle θ2 formed by the common tangent line TC with ′ and the tangent line T2 at the point P2 on the first driven roller 82 ′ that the common tangent line TC collides with becomes smaller. Therefore, in this case, there is a high possibility that the paper P sent from the driving roller 81 and the second driven roller 83 ′ is clogged by the first driven roller 82 ′ on the downstream side.

  On the other hand, in the structure of this embodiment, as shown in FIG. 7A, the common tangent line TC between the driving roller 81 and the second driven roller 83 and the first driven roller 82 where the common tangent line TC hits. The angle θ1 formed with the tangent T1 at the point P1 is increased. Therefore, in this embodiment, it is possible to prevent the paper P sent from the driving roller 81 and the second driven roller 83 from colliding with the first driven roller 82 on the downstream side.

  As shown in FIGS. 5 and 6, the driving roller 81 is rotatably provided on the top cover 22, and the first driven roller 82 and the second driven roller 83 are rotatably provided on the housing 21. Thus, the paper P jammed between the driving roller 81 and the driven rollers 82 and 83 can be easily taken out simply by opening the top cover 22.

  The first driven roller 82 and the second driven roller 83 are arranged side by side in a direction inclined with respect to the horizontal plane so that the direction from the second driven roller 83 toward the first driven roller 82 is obliquely downward. Yes. Thereby, for example, compared to a structure in which two driven rollers are arranged side by side in the horizontal direction, it is possible to reduce the protrusion amount of the first driven roller 82 to the downstream side in the discharge direction with respect to the driving roller 81.

  Further, by reducing the protrusion amount of the first driven roller 82 to the downstream side in the discharge direction with respect to the driving roller 81 in this manner, the two driven rollers are arranged in a horizontal direction (a structure in which the protrusion amount increases). Even if the position of the wall 91 is shifted to the upstream side in the discharge direction, the interference between the vertical wall 91 and the first driven roller 82 when the top cover 22 is opened and closed can be prevented, so that the discharge tray 9 can be widened. It has become.

  A conveyance path 100 for guiding the paper P from the fixing device 7 toward the discharge roller 8 is provided below the first wall portion 22A of the top cover 22. The conveyance path 100 is formed in an arc shape that is convex upward.

  The nip portion of the discharge roller 8 (each nip portion between the driving roller 81 and each driven roller 82, 83) is disposed at a position obliquely below and forward of the vertex 110 of the conveyance path 100. Accordingly, for example, the conveyance path 100 is formed in an arc shape compared to the conveyance path that guides the recording sheet substantially straight toward the discharge roller disposed at a position obliquely above the fixing device (position near the vertex 110 in FIG. 6). Accordingly, the position of the discharge roller 8 can be lowered, so that the laser printer 1 can be downsized.

  Further, since the position of the discharge roller 8 can be more forward than the structure in which the discharge roller 8 is provided near the vertex 110, the lower end of the inclined portion 91B of the vertical wall 91 provided below the discharge roller 8 (that is, the discharge tray). 9 can also be moved to the front side, so that the structure near the exit of the fixing device 7 can be more easily seen when the top cover 22 is opened.

  In addition, this invention is not limited to the said embodiment, It can utilize with various forms so that it may illustrate below.

  In the embodiment, the downstream first driven roller 82 has a larger diameter than the upstream second driven roller 83. However, the present invention is not limited to this, and the diameter relationship may be reversed.

  In the above-described embodiment, the upper surface 10A of the tray cover 10 is configured to be inclined obliquely forward and downward at the covering position. However, the present invention is not limited to this. For example, the upper surface of the tray cover is horizontal at the covering position. You may comprise as follows. Even in this case, the dust on the tray cover located at the covering position can be prevented from falling to the corner on the discharge roller side of the discharge tray.

  In the above embodiment, the top cover 22 capable of opening and closing the upper wall of the apparatus main body 2 is used. However, the present invention is not limited to this, and may be a wall that does not open and close, for example.

  In the above-described embodiment, paper P such as thick paper, postcard, and thin paper is used as an example of the recording sheet. However, the present invention is not limited to this, and may be, for example, an OHP sheet.

  In the above embodiment, the present invention is applied to the laser printer 1. However, the present invention is not limited to this, and the present invention may be applied to other image forming apparatuses such as a copying machine and a multifunction machine.

DESCRIPTION OF SYMBOLS 1 Laser printer 8 Discharge roller 81 Drive roller 82 1st driven roller 83 2nd driven roller 9 Discharge tray P Paper

Claims (5)

An image forming apparatus comprising a discharge tray and a discharge roller for discharging a recording sheet to the discharge tray,
The discharge roller includes a driving roller that is rotated by inputting a driving force, and a first driven roller and a second driven roller that are in contact with the driving roller and are driven to rotate by the driving roller,
The first driven roller is disposed downstream of the second driven roller in the discharge direction of the recording sheet and is formed with a diameter different from the diameter of the second driven roller. apparatus.   The image forming apparatus according to claim 1, wherein the first driven roller is formed with a diameter larger than a diameter of the second driven roller. A fixing device that is disposed upstream and below the discharge direction of the recording sheet relative to the discharge roller, and thermally fixes the developer image on the recording sheet; and from the fixing device toward the discharge roller And a conveyance path for guiding the recording sheet,
The conveyance path is formed in an arc shape that is convex upward,
The image forming apparatus according to claim 1, wherein a nip portion of the discharge roller is disposed below a vertex of the conveyance path. A housing having an opening at the top, and a top cover that is pivotally supported by the housing so that the end on the upstream side in the discharge direction of the recording sheet can open and close the opening,
The top cover is provided with the discharge tray and the drive roller,
The image forming apparatus according to claim 1, wherein the housing is provided with the first driven roller and the second driven roller. The top cover is disposed below the discharge roller, and is provided with a vertical wall that constitutes a part of the discharge tray.
The first driven roller and the second driven roller are arranged side by side in a direction inclined with respect to a horizontal plane so that a direction from the second driven roller toward the first driven roller is an obliquely downward direction. The image forming apparatus according to claim 4.

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