JP6565779B2 - Discharge sheet tray, image forming apparatus - Google Patents

Description

  The present invention relates to a discharge sheet tray and an image forming apparatus including the discharge sheet tray.

  Generally, an image forming apparatus includes a discharge sheet tray that receives a sheet discharged from a sheet discharge port after an image is formed. The electrophotographic image forming apparatus includes a fixing unit that fixes an image on the sheet by heating, and the sheet that has passed through the fixing unit is discharged from a sheet discharge port.

  The discharge sheet tray is formed from a starting point portion below the sheet discharge port to a downstream end point portion in the sheet discharging direction, and an upper surface thereof is inclined from the starting point side toward the end point side. An inclined surface that is inclined upward is included (see, for example, Patent Document 1).

  The sheet that has passed through the fixing unit is curled along the outer peripheral surface of a heating roller that heats the sheet, and is discharged onto the discharge sheet tray in a state of being curled convexly upward. When the heating roller having a small outer diameter is employed in response to a request for downsizing the apparatus, the sheet curls with a larger curvature.

JP 2007-93828 A

  Incidentally, the second sheet may be discharged from the sheet discharge port in a state where the trailing edge of the curled first sheet does not slide down to the starting point of the discharge sheet tray. In this case, the leading edge of the second sheet hits a portion near the trailing edge of the first sheet on the discharge sheet tray, and there is a possibility that the discharge failure of the sheet may occur.

  The discharge failure includes a phenomenon in which the first sheet is pushed out of the discharge sheet tray by the second sheet, or a phenomenon in which the second sheet is submerged below the first sheet. It is. The discharge failure is particularly likely to occur when the curvature of the curl of the sheet is large, that is, when the outer diameter of the heating roller is small.

  An object of the present invention is to provide a discharge sheet tray capable of preventing the discharge failure of the sheet, and an image forming apparatus including the discharge sheet tray, by a structure in which the rear end of the curled sheet is easily slipped down to the starting point of the discharge sheet tray. .

  A discharge sheet tray according to one aspect of the present invention receives a sheet discharged from a sheet discharge port. The discharge sheet tray includes a substrate portion and a plurality of guide ribs. The substrate portion is formed from a starting portion below the sheet discharge port to a downstream end portion in the sheet discharging direction, and an upper surface extending from the starting portion to the downstream side in the sheet discharging direction. A side upper surface and an inclined surface formed by inclining obliquely upward from the downstream end in the sheet discharge direction on the start side upper surface toward the end point side. Each of the plurality of guide ribs protrudes from the upper surface of the substrate portion and is formed along the sheet discharge direction. The plurality of guide ribs include a pair of first guide ribs and other second guide ribs. The pair of first guide ribs are provided symmetrically with respect to the center of the sheet discharge port in the width direction orthogonal to the sheet discharge direction. The pair of first guide ribs are higher than the second guide ribs in the origin side region extending from the origin side upper surface to the inclined surface on the upper surface of the substrate part, and from the upstream end in the sheet discharge direction. It is formed to be inclined obliquely upward toward the downstream side.

  An image forming apparatus according to another aspect of the present invention includes a fixing unit, a sheet discharge unit, and the discharge sheet tray. The fixing unit fixes the image on the sheet by heating. The sheet discharge unit discharges the sheet that has passed through the fixing unit from a sheet discharge port. The discharge sheet tray receives the sheet discharged from the sheet discharge port.

  According to the present invention, it is possible to provide a discharge sheet tray that can prevent the discharge failure of the sheet and an image forming apparatus including the discharge sheet tray by a structure in which the trailing end of the curled sheet is easily slipped down to the starting point of the discharge sheet tray. become.

FIG. 1 is a perspective view of an image forming apparatus including a discharge sheet tray according to the embodiment. FIG. 2 is a perspective view of the discharge sheet tray and the periphery thereof according to the embodiment. FIG. 3 is a cross-sectional view of the discharge sheet tray and the periphery thereof according to the embodiment. FIG. 4 is a cross-sectional view of a main part of the discharge sheet tray according to the embodiment. FIG. 5 is a cross-sectional view of the discharge sheet tray and its periphery immediately after the first sheet is discharged. FIG. 6 is a cross-sectional view of the discharge sheet tray and its peripheral portion according to the embodiment when the second sheet starts to be discharged. FIG. 7 is a cross-sectional view of the discharge sheet tray and its peripheral portion according to the embodiment when the second sheet is discharged. FIG. 8 is a cross-sectional view of a discharge sheet tray and its peripheral portion according to a reference example when the second sheet starts to be discharged.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the following embodiment is an example which actualized this invention, Comprising: It does not have the character which limits the technical scope of this invention.

  As shown in FIGS. 1 and 2, the discharge sheet tray 1 according to the embodiment is provided on the upper portion of the main body 2 of the image forming apparatus 10. The discharge sheet tray 1 is a portion that receives the sheet 9 discharged from the sheet discharge port 2a at the top of the main body 2 after the image is formed.

  The image forming apparatus 10 is an electrophotographic printer. It is also conceivable that the image forming apparatus 10 is a copying machine, a facsimile machine, or a multifunction machine.

  As shown in FIG. 3, the image forming apparatus 10 includes a fixing unit 3 that fixes an image on the sheet 9 by heating. The fixing unit 3 includes a heating roller 31 and a pressure roller 32 that rotate while sandwiching the sheet 9. The heating roller 31 is heated by a heater 33.

  The image forming apparatus 10 includes an image forming unit (not shown) that forms a toner image on the sheet 9. The sheet 9 on which an image is formed by the image forming unit is conveyed to the fixing unit 3.

  The sheet 9 on which the image has been fixed is conveyed by the relay roller pair 4 and the discharge roller pair 5, and the discharge roller pair 5 removes the sheet 9 via the fixing unit 3 and the relay roller pair 4 from the sheet discharge port 2a. Drain up one. The discharge roller pair 5 is an example of a sheet discharge unit.

  The sheet 9 is discharged onto the discharged sheet tray 1 from the sheet discharge port 2a with the surface in contact with the heating roller 31 facing downward.

  3 to 5, the fixing unit 3, the relay roller pair 4, the discharge roller pair 5, and the pressing member 6 are illustrated in a simplified manner.

  The sheet 9 that has passed through the fixing unit 3 is curled along the outer peripheral surface of the heating roller 31 that heats the sheet 9, and is discharged onto the discharge sheet tray 1 in a state of being curled convexly upward (FIGS. 5 and 6). reference). When the heating roller 31 having a small outer diameter is employed in response to a request for downsizing the apparatus, the sheet 9 curls with a larger curvature.

  The image forming apparatus 10 includes a pressing member 6 that is rotatably supported by a portion of the main body 2 above the sheet discharge port 2a and hangs down in front of the sheet discharge port 2a. The pressing member 6 is pushed up by the sheet 9 discharged from the sheet discharge port 2a. Further, the pressing member 6 is also pushed up by the sheets 9 stacked on the discharge sheet tray 1 exceeding a predetermined full level.

  The pressing member 6 suppresses the ejection of the discharged sheet 9 by pressing the discharged sheet 9 from above, and further improves the stack consistency of the sheet 9 on the discharged sheet tray 1.

  The discharge sheet tray 1 is a synthetic resin molding member. The discharge sheet tray 1 includes a substrate unit 11. The substrate portion 11 is formed from a starting point portion 11x below the sheet discharge port 2a to a downstream end point portion 11y in the sheet discharging direction D1. The upper surface of the substrate portion 11 includes an inclined surface 11b that is inclined obliquely upward from the starting point portion 11x side toward the ending point portion 11y side.

  In the following description, a horizontal direction orthogonal to the sheet discharge direction D1 is referred to as a width direction D2. The width direction D2 is a longitudinal direction of the sheet discharge port 2a.

  In the present embodiment, the upper surface of the substrate portion 11 is continuous with the first horizontal surface 11a occupying a part of the range from the starting portion 11x in the sheet discharge direction D1, the inclined surface 11b continuous with the first horizontal surface 11a, and the inclined surface 11b. 2nd horizontal surface 11c (refer FIG. 3).

  The first horizontal plane 11a is an example of an upper surface on the starting point side that extends from the starting point portion 11x to the downstream side in the sheet discharge direction D1. In addition, the inclined surface 11b is an example of a surface that is formed to be inclined obliquely upward from the downstream end of the sheet discharge direction D1 on the starting side upper surface toward the end point 11y.

  The second horizontal surface 11c is a part of the upper surface from the end point portion 11y of the substrate portion 11, and the inclined surface 11b is an intermediate portion between the first horizontal surface 11a and the second horizontal surface 11c.

  The discharge sheet tray 1 includes a sheet stopper 14 attached to the substrate unit 11. The sheet stopper 14 includes a retracted position accommodated in a portion near the end point portion 11y of the substrate portion 11, and a use position extending from the portion near the end point portion 11y of the substrate portion 11 obliquely upward on the downstream side in the sheet discharge direction D1. It is attached to the board | substrate part 11 in the state which can be displaced between.

  In the present embodiment, the sheet stopper 14 at the retracted position is accommodated in a region straddling the inclined surface 11b and the second horizontal surface 11c in the substrate portion 11. The sheet stopper 14 can swing around a shaft portion pivotally supported by the second horizontal plane 11c.

  In FIG. 3, the sheet stopper 14 at the use position is indicated by a solid line, and the sheet stopper 14 at the retracted position is indicated by a two-dot chain line (virtual line). The sheet stopper 14 restricts the movement of the leading end 9a of the sheet 9 to the downstream side in the sheet discharge direction D1 at the use position (see FIGS. 5 and 7). That is, the sheet stopper 14 prevents the leading end 9a of the sheet 9 from protruding from the discharge sheet tray 1 to the downstream side in the sheet discharge direction D1.

  In the example shown in FIGS. 2 and 3, the sheet stopper 14 includes a rotation base portion 14 a that is rotatably supported by the substrate portion 11, and an extension portion 14 b that is rotatably supported by the end portion of the rotation base portion 14 a. And have.

  A first shaft portion 141 is formed on the rotation base portion 14a along the width direction D2, and the first shaft portion 141 is rotatably supported by the substrate portion 11. A second shaft portion 142 is formed along the width direction D2 in the extended portion 14b, and the second shaft portion 142 is supported so as to be rotatable with respect to the distal end portion of the rotation base portion 14a.

  In the state where the sheet stopper 14 is located at the use position, the rotation base portion 14a extends obliquely upward from the base plate portion 11 toward the downstream side in the sheet discharge direction D1, and the expansion portion 14b is the tip of the rotation base portion 14a. It extends obliquely upward from the portion toward the downstream side in the sheet discharge direction D1.

  In a state where the sheet stopper 14 is located at the retracted position, the extension portion 14b is folded to a position along the rotation base portion 14a, and the rotation base portion 14a and the extension portion 14b are accommodated in a recess 11d formed in the substrate portion 11. Has been.

  The discharge sheet tray 1 also includes a plurality of guide ribs 12 and 13 formed to protrude from the upper surface of the substrate unit 11. These guide ribs 12 and 13 will be described later.

  The discharge sheet tray 100 according to the reference example shown in FIG. 8 includes a substrate unit 11 and a sheet stopper 14 as with the discharge sheet tray 1. A discharge sheet tray 100 shown in FIG. 8 is an example of a conventional discharge sheet tray.

  By the way, as shown in FIG. 8, the rear end 9b of the curled first sheet 9 does not slide down to the starting portion 11x of the discharge sheet tray 100, and the second sheet 9 is in the sheet discharge port 2a. May be discharged from. In this case, the leading end 9a of the second sheet 9 hits a portion near the rear end 9b of the first sheet 9 on the discharge sheet tray 100, and there is a possibility that the discharge failure of the sheet 9 may occur.

  The discharge failure includes a phenomenon in which the first sheet 9 is pushed out of the discharge sheet tray 100 by the second sheet 9, or a phenomenon in which the second sheet 9 sinks below the first sheet 9. It is. The discharge failure is likely to occur when the outer diameter of the heating roller 31 is small and when a deep nip portion is formed between the heating roller 31 and the pressure roller 32.

  On the other hand, the discharge sheet tray 1 shown in FIGS. 2 to 7 has a structure in which the rear end 9b of the curled sheet 9 is easy to slide down to the starting point portion 11x. Thereby, the discharge failure of the sheet can be prevented. Hereinafter, the structure of the discharge sheet tray 1 will be described.

  The discharge sheet tray 1 includes three or more guide ribs 12 and 13 that protrude from the upper surface of the substrate portion 11. The guide ribs 12 and 13 are convex portions that form ridge lines along the sheet discharge direction D1. The guide ribs 12 and 13 are formed in series along the sheet discharge direction D1 from the starting point portion 11x or a position near the starting point portion 11x to a position near the end point portion 11y or the end point portion 11y.

  For example, the guide ribs 12 and 13 are formed from the starting part 11x of the substrate part 11 to the position upstream of the end point part 11y in the sheet discharging direction D1. In the present embodiment, all the guide ribs 12 and 13 are formed in the same range in the sheet discharge direction D1.

  Further, the sheet stopper 14 is formed so as to extend further obliquely upward on the downstream side from the position of the end portions of the guide ribs 12 and 13 on the downstream side in the sheet discharge direction D1 at the use position. Accordingly, the front end 9a of the sheet 9 fed by the discharge roller pair 5 slides on the tops of the guide ribs 12 and 13 and then rides on the sheet stopper 14 (see FIG. 5).

  Since the inclination angle of the sheet stopper 14 is sufficiently larger than the inclination angle of the guide ribs 12 and 13, the movement of the leading end 9 a of the sheet 9 toward the downstream side in the sheet discharge direction D <b> 1 is limited by the sheet stopper 14.

  The guide ribs 12 and 13 are inclined obliquely upward from the upstream side to the downstream side in the sheet discharge direction D1 at least in the starting side region A1 extending from the first horizontal surface 11a to the inclined surface 11b of the substrate unit 11 in the sheet discharge direction D1. Is formed.

  The guide ribs 12 and 13 include a pair of first guide ribs 12 provided symmetrically with respect to the center of the sheet discharge port 2a in the width direction D2, and other second guide ribs 13. The discharge sheet tray 1 includes four guide ribs 12 and 13 and includes two second guide ribs 13. In the present embodiment, one second guide rib 13 is also provided symmetrically with respect to the center of the sheet discharge port 2a in the width direction D2.

  One and the other of the pair of first guide ribs 12 are formed at the same height as viewed from the horizontal direction in the entire range in the sheet discharge direction D1. Further, one and the other of the two second guide ribs 13 are formed at the same height as viewed from the horizontal direction in the entire range in the sheet discharge direction D1. However, the pair of first guide ribs 12 are formed at a height different from that of the two second guide ribs 13 in the origin side region A1 in the sheet discharge direction D1.

  As shown in FIGS. 3 and 4, the pair of first guide ribs 12 are formed higher than the second guide ribs 13 when viewed from the horizontal direction in the starting side area A1 in the sheet discharge direction D1.

  In addition, the pair of first guide ribs 12 are formed so as to be inclined obliquely upward from the upstream end in the sheet discharge direction D1 toward the downstream side in the starting side region A1. In the following description, the portion of the starting side area A1 in the pair of first guide ribs 12 is referred to as a tall inclined portion 12a.

  In the present embodiment, the tall inclined portions 12a of the pair of first guide ribs 12 are formed to be inclined with a certain first gradient obliquely upward from the upper surface of the starting portion 11x.

  Further, the pair of first guide ribs 12 has an intermediate inclined portion 12b inclined obliquely upward toward the downstream side in the sheet discharge direction D1 in the intermediate region A2 on the downstream side in the sheet discharge direction D1 with respect to the start point side region A1. . The intermediate inclined portion 12b of the pair of first guide ribs 12 is formed to be inclined with a second gradient that is steeper than the first gradient. The second gradient is the same as the gradient of the inclined surface 11b.

  Further, the pair of first guide ribs 12 has a horizontal portion 12c formed horizontally in the end point side region A3 adjacent to the intermediate region A2 downstream in the sheet discharge direction D1.

  On the other hand, the two second guide ribs 13 are formed to be inclined obliquely upward with a third gradient from the upper surface of the starting portion 11x in the starting side partial region A10 that is the region of the first horizontal surface 11a in the sheet discharging direction D1. Yes. In the following description, the part of the starting point side partial area A10 in the second guide rib 13 is referred to as a low inclined part 13a. The low-profile inclined portion 13a is inclined with the third gradient that is gentler than the first gradient.

  Further, the two second guide ribs 13 have an intermediate inclined portion 13b adjacent to the downstream side in the sheet discharge direction D1 with respect to the starting side partial region A10. The intermediate inclined portion 13b is inclined with the second gradient obliquely upward toward the downstream side in the sheet discharge direction D1 in the remaining area downstream in the sheet discharge direction D1 in the start side area A1 and the intermediate area A2. Is formed.

  That is, the intermediate inclined portions 12b of the pair of first guide ribs 12 and the intermediate inclined portions 13b of the two second guide ribs 13 are inclined at the same inclination angle with respect to the horizontal direction. Further, the two second guide ribs 13 have a horizontal portion 13c formed horizontally in the end point side region A3. That is, the intermediate inclined portion 13b is formed along the inclined surface 11b, and the horizontal portion 13c is formed along the second horizontal plane 11c.

  And all the guide ribs 12 and 13 are formed in the same height seeing from the horizontal direction in the sheet | seat discharge | emission direction D1 downstream from the origin side area | region A1. That is, all the guide ribs 12 and 13 are formed with the same height and the same gradient on the downstream side of the sheet discharge direction D1 from the starting side area A1. The starting point side region A1 is a region where the pair of first guide ribs 12 are formed with a certain gradient from the end on the starting point portion 11x side.

  As described above, the tall inclined portions 12a of the pair of first guide ribs 12 are formed higher than the other second guide ribs 13 when viewed from the horizontal direction. Therefore, the rear end 9b of the curled sheet 9 is in a stable state in which it is difficult to tilt in the width direction D2 and has a small frictional resistance, and is in contact with only the part of the origin side region A1 in the pair of first guide ribs 12 (see FIG. 5 and 6).

  For example, when the rear end 9b of the sheet 9 is in contact with the upper surface of the substrate portion 11 (see FIG. 8) and when the rear end 9b of the sheet 9 is in contact with three or more guide ribs 12 and 13, the rear of the sheet 9 The friction resistance between the rear end 9b of the sheet 9 and the discharge sheet tray 1 is smaller when the end 9b is in contact with only the tall inclined portion 12a of the pair of first guide ribs 12.

  Further, the tall inclined portions 12a of the pair of first guide ribs 12 are formed to be inclined obliquely upward from the upstream end in the sheet discharge direction D1 toward the downstream side. Therefore, the rear end 9b of the curled sheet 9 is likely to slide down to the starting point portion 11x on the pair of first guide ribs 12.

  In a state where the rear end 9b of the first sheet 9 is present at the starting point portion 11x or a position close to the starting point portion 11x, the leading end 9a of the second sheet 9 is the first sheet on the discharge sheet tray 1. 9 is in contact with a portion relatively distant from the rear end 9b (see FIG. 6). In this case, it is possible to avoid the occurrence of the discharge failure such that the second sheet 9 pushes the first sheet 9 out of the discharge sheet tray 1 or enters the lower side of the first sheet 9. Can do.

  Further, the tall inclined portions 12a of the pair of first guide ribs 12 are formed so as to be inclined obliquely upward from the first horizontal plane 11a with a certain gradient. In this case, the inclination angle of the tall inclined portion 12a can be increased as much as possible in a limited space in the height direction. Thereby, the rear end 9b of the curled sheet 9 slides down more reliably to the starting point portion 11x.

  Further, all the guide ribs 12 and 13 are formed at the same height when viewed from the horizontal direction on the downstream side in the sheet discharge direction D1 from the starting side area A1. In this case, the leading end 9a of the sheet 9 is in contact with all the guide ribs 12 and 13 with an equal load in a wide range in the width direction D2. Therefore, the leading end 9a of the sheet 9 can easily slide on the tops of the guide ribs 12 and 13 along the sheet discharge direction D1. As a result, the sheet 9 can be prevented from skewing on the discharge sheet tray 1.

  Further, the pair of first guide ribs 12 are formed on the inner side of the two second guide ribs 13 in the width direction D2. As a result, the rear end 9b of the discharged sheet 9 is surely placed on the pair of tall first guide ribs 12 regardless of the size of the sheet 9.

  Further, the sheet stopper 14 stops the movement of the leading end 9a of the curled sheet 9, so that the elastic force of the curled sheet 9 itself acts as a force for moving the trailing end 9b of the sheet 9 to the starting portion 11x side. Thereby, the rear end 9b of the curled sheet 9 slides down more reliably to the starting point portion 11x.

[Application example]
It is also conceivable that the discharge sheet tray 1 has four or more even number of second guide ribs 13. In this case, half of all the second guide ribs 13 are provided symmetrically with respect to the center of the sheet discharge port 2a in the width direction D2.

  It is also conceivable that the discharge sheet tray 1 has an odd number of second guide ribs 13. In this case, one of the second guide ribs 13 is formed at the center position of the sheet discharge port 2a in the width direction D2, and half of all the remaining second guide ribs 13 are formed in the sheet discharge port 2a in the width direction D2. Are provided symmetrically with respect to the center. When the discharge sheet tray 1 has only one second guide rib 13, the second guide rib 13 is provided at the center position of the sheet discharge port 2a in the width direction D2.

  Further, it is also conceivable that the second guide rib 13 is formed in a range further downstream from the downstream position than the upstream end of the pair of first guide ribs 12 in the sheet discharge direction D1.

  When the discharge sheet tray 1 has three first guide ribs 12, one of the first guide ribs 12 is formed at the center position of the sheet discharge port 2a in the width direction D2, and the remaining pair of first guide ribs. 12 are provided symmetrically with respect to the center of the sheet discharge port 2a in the width direction D2.

  The discharge sheet tray and the image forming apparatus according to the present invention can be freely combined, or the embodiments and application examples described above, within the scope of the inventions described in the claims. It is also possible to configure by appropriately modifying or omitting a part.

DESCRIPTION OF SYMBOLS 1,100: Discharged sheet tray 2: Main body 2a of image forming apparatus: Sheet discharge port 3: Fixing unit 4: Relay roller pair 5: Discharge roller pair 6: Press member 9: Sheet 9a: Sheet tip 9b: After sheet Edge 10: Image forming apparatus 11: Substrate portion 11a: First horizontal surface 11b: Inclined surface 11c: Second horizontal surface 11d: Recess 11x: Starting point portion 11y: End point portion 12: First guide rib 12a: Tall inclined portion of the first guide rib 12b: Intermediate inclined portion 12c of the first guide rib 12c: Horizontal portion 13 of the first guide rib 13: Second guide rib 13a: Low inclined portion 13b of the second guide rib 13: Intermediate inclined portion 13c of the second guide rib 13: Horizontal portion 14 of the second guide rib : Sheet stopper 14a: Rotating base 14b: Expansion part 31: Heating roller 32: Pressure roller 33: Heater 141: First shaft 142: second shaft portion A1: origin side region A10: origin portion region A2: intermediate area A3: the end point area D1: sheet discharging direction D2: Width direction

Claims (3)

A discharge sheet tray for receiving sheets discharged from the sheet discharge port,
A starting side upper surface formed from a starting point portion below the sheet discharge port to a downstream end point portion in the sheet discharging direction, and an upper surface thereof extending from the starting point portion to the downstream side in the sheet discharging direction and the starting point. A substrate portion including an inclined surface formed to be inclined obliquely upward from the downstream end in the sheet discharge direction on the side upper surface toward the end point portion side;
A plurality of guide ribs each protruding from the upper surface of the substrate part and formed along the sheet discharge direction,
Wherein the plurality of guide ribs, both of the pair of first guide ribs in a pair of first guide ribs and the width direction provided symmetrically with respect to the center of the sheet discharge port in a width direction perpendicular to the sheet discharging direction Including two second guide ribs formed on the outside;
The pair of first guide ribs is formed in at least a start side region extending from the start side upper surface to the inclined surface on the upper surface of the substrate portion, and is higher than the two second guide ribs and the start portion A first upstream inclined portion that is inclined obliquely upward toward the downstream side in the sheet discharging direction with a constant first gradient, and downstream in the sheet discharging direction with respect to the first upstream inclined portion. A first downstream-side inclined portion that is formed without any step on the side and is inclined obliquely upward with a second gradient that is steeper than the first gradient toward the downstream side in the sheet discharge direction. ,
The two second guide ribs are inclined obliquely upward with a third gradient gentler than the first gradient toward the downstream side in the sheet discharge direction from the starting portion to a position in the middle of the starting side region. The formed second upstream inclined portion and the second upstream inclined portion are connected to the downstream side in the sheet discharge direction without a step with respect to the second upstream side inclined portion and obliquely upward toward the downstream side in the sheet discharge direction. And a second downstream side inclined portion formed to be inclined at
A discharge sheet tray in which the pair of first guide ribs and the two second guide ribs are formed at the same height on the downstream side in the sheet discharge direction from the start point side region.   Displacement between the retracted position accommodated in the portion near the end point portion of the substrate portion and the use position extending obliquely upward further downstream from the position of the end portion of the guide rib on the downstream side in the sheet discharging direction. 2. The discharged sheet tray according to claim 1, further comprising a sheet stopper that is attached to the substrate unit in a possible state and restricts movement of the leading end of the sheet to the downstream side in the sheet discharging direction at the use position. . A fixing unit that fixes the image on the sheet by heating;
A sheet discharge section for discharging the sheet via the fixing section from a sheet discharge port;
An image forming apparatus comprising: the sheet discharged from the sheet discharge port; and the discharged sheet tray according to claim 2.

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