JP2021109713A - Sheet discharge device and image formation device - Google Patents

Abstract

To prevent an oscillation member for detecting a full state of a sheet loaded on a discharge tray from crushing the corrugated shape of the sheet formed by the action of a corrugation member.SOLUTION: A rotation member 62 has two oscillation members 7 that are formed so as to extend from a shaft part 621 toward a discharge tray, and are pushed up by the sheet loaded on the discharge tray. The two oscillation members 7 are provided on both sides of a corrugation member 611 in a width direction D2 of the shaft part 621, and at a specific part 621a between the two sets of a pair of discharge rollers 31a. An arm part 72 of each of the oscillation members 7 can vertically oscillate around the specific part 621a, and is oscillatably attached to a connecting part 71 provided in the specific part 621a from a reference posture extending toward the discharge tray to an outside in the width direction D2.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sheet ejection device and an image forming apparatus including a mechanism for detecting the fullness of the sheets loaded on the ejection tray.

Generally, the image forming apparatus includes a sheet discharging device for discharging the sheet after image formation from the discharging port of the sheet transport path to the discharging tray. The sheet discharging device includes a plurality of sets of discharging roller pairs arranged side by side in the width direction of the discharging port.

In addition, the sheet discharging device may include a full detection mechanism for detecting that the sheet loaded on the discharging tray has been loaded in excess of a predetermined allowable level (see, for example, Patent Document 1).

The full detection mechanism includes a swing member formed so as to extend from a shaft portion rotatably supported above the discharge port toward the discharge tray. The swinging member is pushed up by the sheet loaded on the discharge tray.

The fullness detection mechanism further includes a fullness detection sensor that detects that the rocking member has been pushed up beyond a predetermined permissible level.

Further, the sheet discharging device may include a plurality of corrugation members (see, for example, Patent Document 2). The plurality of corrugation members are arranged at positions deviated in the width direction with respect to the position of the discharge roller pair at the discharge port.

The plurality of corrugation members contact one side of the sheet passing through the discharge port to deform the sheet into a wavy shape in the width direction. The action of the corrugation member enhances the straightness of the sheet during discharge. As a result, the sheet is smoothly discharged onto the discharge tray without the tip portion hanging down.

JP-A-2007-204228 Japanese Unexamined Patent Publication No. 2017-01879

By the way, the swinging member comes into contact with the sheet being discharged on the downstream side in the sheet discharging direction with respect to the corrugation member. As a result, the swinging member may crush the wavy shape of the sheet formed by the action of the corrugation member.

When the wavy shape of the sheet is crushed, the tip end portion of the sheet hangs down, and the sheet is discharged onto the discharge tray in a curled state.

An object of the present invention is a sheet transport device and an image forming device capable of preventing a swinging member for detecting fullness of a sheet loaded on a discharge tray from crushing the wavy shape of a sheet formed by the action of a corrugation member. Is to provide.

The sheet transport device according to one aspect of the present invention includes two sets of discharge roller pairs, a corrugation member, a rotating member, and a fullness detection sensor. The two sets of discharge roller pairs are arranged at intervals in the width direction of the discharge port of the sheet transport path, and discharge the sheet from the discharge port onto the discharge tray. The corrugation member is arranged below the discharge port between the two sets of discharge roller pairs in the width direction, and has a convex portion that contacts the lower surface of the sheet passing through the discharge port. The rotating member is arranged above the discharge port along the width direction, is formed of a rotatably supported shaft portion and a shaft portion extending from the shaft portion toward the discharge tray, and is formed on the discharge tray. It has two swinging members that are pushed up by the loaded seat. The full detection sensor detects that at least one of the two rocking members has been pushed up beyond a predetermined permissible level. The two swinging members are provided at two specific portions on the shaft portion between the widthwise position of the corrugation member and the widthwise position of the two sets of discharge roller pairs. .. Each of the swinging members has a connecting portion and an arm portion. The connecting portion is provided in the specific portion. The arm portion is formed so as to extend from the connecting portion toward the discharge tray, is swingably connected to the connecting portion outward in the width direction, and is connected to the sheet passing through the discharge port. It comes into contact with the corrugation member on the downstream side in the sheet discharge direction, and is further pushed up by the sheet loaded on the discharge tray.

The image forming apparatus according to another aspect of the present invention includes a printing apparatus that forms an image on a sheet conveyed along a sheet conveying path, and a sheet after image formation is placed on an ejection tray from an ejection port of the sheet conveying path. The sheet discharging device for discharging to is provided.

According to the present invention, a sheet transport device and an image forming device capable of preventing a swinging member for detecting fullness of a sheet loaded on a discharge tray from crushing the wavy shape of a sheet formed by the action of a corrugation member. Will be able to provide.

FIG. 1 is a configuration diagram of an image forming apparatus including the sheet ejecting apparatus according to the embodiment. FIG. 2 is a front view of the sheet discharging device according to the embodiment. FIG. 3 is a perspective view of a rotating member in the sheet discharging device according to the embodiment. FIG. 4 is a diagram showing a rotating member in a full detection state and a full detection sensor in the sheet discharging device according to the embodiment. FIG. 5 is a front view of the sheet discharging device according to the application example. FIG. 6 is a front view of a main part of the rotating member in the seat discharging device according to the application example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples that embody the present invention, and do not limit the technical scope of the present invention.

[Structure of image forming apparatus 10]
The sheet discharging device 6 according to the embodiment constitutes a part of the image forming device 10. The image forming apparatus 10 is an apparatus that executes a printing process for forming an image on the sheet 9. The sheet 9 is a sheet-like image forming medium such as paper or an envelope.

The image forming apparatus 10 includes a sheet accommodating portion 2, a sheet conveying device 3, a printing apparatus 40, and the like provided in the main body portion 1, respectively.

The sheet transfer device 3 includes a delivery roller pair 300 that sends the sheet 9 housed in the sheet accommodating unit 2 to the sheet transfer path 30 in the main body 1. The delivery roller pair 300 sends the sheet 9 to the sheet transport path 30 by rotating with the sheet 9 sandwiched between them.

Further, the sheet transfer device 3 includes a plurality of sets of transfer roller pairs 31 that transfer the sheet 9 along the sheet transfer path 30 by rotating with the sheet 9 sandwiched between them. The printing device 40 forms an image on the sheet 9 transported along the sheet transport path 30.

In the example shown in FIG. 1, the printing apparatus 40 executes the printing process in an electrophotographic manner. It is also conceivable that the printing device 40 is a device that executes the printing process by another method such as an inkjet method.

The printing device 40 includes an image forming device 4, a transfer device 5, and a fixing device 49. The image forming apparatus 4 includes a drum-shaped photoconductor 41, a charging apparatus 42, a developing apparatus 43, a drum cleaning apparatus 45, and the like.

The printing apparatus 40 shown in FIG. 1 can execute the color printing process by a tandem method. Therefore, the printing device 40 includes a plurality of image forming devices 4 corresponding to toners of a plurality of colors.

Further, the transfer device 5 includes an intermediate transfer belt 51, a pair of belt support rollers 52, a belt cleaning device 53, and a plurality of primary transfer devices 54 corresponding to the plurality of image forming devices 4. The pair of belt support rollers 52 rotatably support the intermediate transfer belt 51.

The printing apparatus 40 includes four image forming apparatus 4 and four primary transfer apparatus 54 corresponding to the toners of the four colors of yellow, cyan, magenta, and black.

In the image forming apparatus 4, the photoconductor 41 rotates, and the charging device 42 charges the surface of the photoconductor 41. Further, the optical scanning device 46 writes an electrostatic latent image on the surface of the photoconductor 41. Further, the developing device 43 develops the electrostatic latent image as a toner image.

In the transfer device 5, each of the primary transfer devices 54 transfers the toner image on the surface of each of the photoconductors 41 to the intermediate transfer belt 51. As a result, the color toner image is formed on the lower surface of the intermediate transfer belt 51.

The secondary transfer device 48 transfers the toner image formed on the intermediate transfer belt 51 to the sheet 9 conveyed along the sheet transfer path 30. The fixing device 49 fixes the toner image transferred to the sheet 9 to the sheet 9 by heating and pressurizing.

The image-formed sheet 9 that has passed through the fixing device 49 is discharged onto the discharge tray 1x by a plurality of sets of discharge roller pairs 31a. The belt cleaning device 53 removes the toner remaining in the portion of the intermediate transfer belt 51 that has passed through the secondary transfer device 48.

The plurality of sets of transport roller pairs 31 in the sheet transport device 3 includes a plurality of sets of discharge roller pairs 31a arranged at the discharge port 30a of the sheet transport path 30.

The plurality of sets of discharge roller pairs 31a discharge the sheet 9 on which the image is formed by rotating the sheet 9 from the discharge port 30a of the sheet transport path 30 onto the discharge tray 1x. The direction in which the discharge roller pair 31a discharges the sheet 9 from the discharge port 30a is the sheet discharge direction D1. In the following description, the horizontal direction orthogonal to the sheet discharge direction D1 is referred to as the width direction D2.

As shown in FIG. 2, a plurality of sets of discharge roller pairs 31a are arranged side by side at a discharge port 30a of the sheet transport path 30 at intervals in the width direction D2. In the present embodiment, the sheet discharging device 6 includes two sets of discharging rollers 31a.

The two sets of discharge roller pairs 31a are arranged symmetrically with respect to the reference position P0 at the center of the passage range of the sheet 9 in the width direction D2 of the discharge port 30a.

One roller in each of the plurality of sets of discharge roller pairs 31a is fixed to a roller shaft 310 rotatably supported along the width direction D2.

When the roller shaft 310 is rotationally driven by a motor (not shown), a plurality of sets of discharge roller pairs 31a rotate.

[Structure of sheet ejection device 6]
In the image forming apparatus 10, a plurality of sets of ejection roller pairs 31a form a part of the sheet ejection device 6. The sheet discharging device 6 discharges the sheet 9 on which the image is formed from the discharging port 30a of the sheet transport path 30.

The sheet discharging device 6 includes a plurality of corrugation members 61, a rotating member 62, and a fullness detection sensor 63 in addition to a plurality of sets of discharging roller pairs 31a (see FIGS. 2 to 4). The seat discharge device 6 also includes a motor (not shown) that rotationally drives a plurality of sets of discharge roller pairs 31a.

In the image forming apparatus 10, if the sheet 9 hangs down immediately after coming out of the discharge port 30a of the sheet transport path 30, the sheet 9 is discharged onto the discharge tray 1x in a curled state.

The sheet discharging device 6 includes a plurality of corrugation members 61 in order to solve the problem of curling of the sheet 9 (see FIGS. 1 and 2).

As shown in FIG. 2, the plurality of corrugation members 61 are supported at the discharge port 30a at positions deviated from the positions of the plurality of sets of discharge rollers vs. 31a in the width direction D2.

The plurality of corrugation members 61 are provided at positions between the plurality of sets of discharge rollers vs. 31a in the width direction D2 and at positions on both outer sides of the plurality of sets of discharge rollers vs. 31a. The outside of the width direction D2 means the side opposite to the reference position P0 side in the width direction D2. Further, the inside of the width direction D2 means the reference position P0 side in the width direction D2.

In the present embodiment, the sheet discharging device 6 includes three corrugation members 61. The three corrugation members 61 consist of one central corrugation member 611 arranged at the reference position P0 in the width direction D2 and two outer corrugation members 612 arranged on both outer sides of the two sets of discharge rollers 31a in the width direction D2. And include.

Each of the corrugation members 61 has a convex portion 61a that contacts the lower surface of the sheet 9 passing through the discharge port 30a of the sheet transport path 30.

The plurality of corrugation members 61 deform the sheet 9 into a wavy shape in the width direction D2 when the convex portion 61a comes into contact with the lower surface of the sheet 9. That is, the convex portion 61a of each of the corrugation members 61 imparts a waveform to the sheet 9 by bending a part of the sheet 9. As a result, the seat 9 is seated in the seat discharge direction D1.

Due to the action of the corrugation member 61, the straightness of the sheet 9 being discharged is enhanced. As a result, the tip of the sheet 9 is discharged onto the discharge tray 1x without hanging down, and the problem of curling of the sheet 9 is solved. That is, the consistency of the sheet 9 loaded on the discharge tray is improved.

The rotating member 62 and the fullness detection sensor 63 constitute a fullness detection mechanism. The full detection mechanism detects that the sheet 9 loaded on the discharge tray 1x has been loaded in excess of a predetermined allowable level.

As shown in FIGS. 2 and 3, the rotating member 62 includes a shaft portion 621 and one or more swinging members 7. In the present embodiment, the rotating member 62 includes two swinging members 7. The shaft portion 621 is arranged above the discharge port 30a along the width direction D2 and is rotatably supported. The swing member 7 is formed so as to extend from the shaft portion 621 toward the discharge tray 1x. The rocking member 7 comes into contact with the upper surface of the sheet 9 loaded on the discharge tray 1x, and is pushed up by the contacted sheet 9.

The fullness detection sensor 63 detects that the swing member 7 of the rotating member 62 has been pushed up beyond a predetermined allowable level. Specifically, the rotating member 62 has a displacement portion 622 that is displaced in conjunction with the swing member 7, and the fullness detection sensor 63 has the displacement portion 622 displaced beyond a predetermined allowable range. Is detected.

The displacement portion 622 is formed so as to extend from the shaft portion 621 outside the passage range of the sheet 9 at the discharge port 30a in the width direction D2. The full detection sensor 63 is a sensor that detects an object, and the displacement portion 622 has a detected portion 622a detected by the full detection sensor 63. For example, the full detection sensor 63 may be a transmissive photo sensor, a reflective photo sensor, a contact limit switch, or the like.

In the initial state of the rotating member 62 in which the rocking member 7 is not in contact with the seat 9, the detected portion 622a of the displacement portion 622 exists at the first position P1 (see FIGS. 3 and 4). Then, when the swing member 7 is pushed up by the seat 9, the detected portion 622a is displaced from the first position P1 toward the predetermined second position P2.

When the rocking member 7 is pushed up beyond the permissible level, the tip of the detected portion 622a in the displacement direction reaches the second position P2, and the rear end of the detected portion 622a in the displacement direction is the first position P1. Get away from.

The fullness detection sensor 63 detects that the swing member 7 has been pushed up beyond the permissible level by detecting the detected portion 622a in a part of the displacement range of the detected portion 622a.

In the example shown in FIG. 4, the full detection sensor 63 detects the swing member 7 existing at the first position P1. In this case, the state in which the fullness detection sensor 63 does not detect the rocking member 7 is the state in which the rocking member 7 is pushed up beyond the permissible level.

By the way, the rocking member 7 comes into contact with the discharging sheet 9 on the downstream side of the sheet discharging direction D1 with respect to the corrugation member 61. As a result, the rocking member 7 may crush the wavy shape of the sheet 9 formed by the action of the corrugation member 61.

When the wavy shape of the sheet 9 is crushed, the tip end portion of the sheet 9 hangs down, and the sheet 9 is discharged onto the discharge tray 1x in a curled state.

On the other hand, in the sheet discharging device 6, the rocking member 7 for detecting the fullness of the sheet 9 loaded on the discharging tray 1x prevents the wavy shape of the sheet 9 formed by the action of the corrugation member 61 from being crushed. It has a configuration that can be used.

[Structure of rocking member 7]
As shown in FIGS. 2 to 4, the two swinging members 7 are provided at two specific portions 621a in the shaft portion 621. The specific portion 621a is a portion of the shaft portion 621 between the position of the central corrugation member 611 in the width direction D2 and the position of the two sets of discharge rollers 31a in the width direction D2. In the present embodiment, the two specific portions 621a are portions of the shaft portion 621 on both sides of the central corrugation member 611 in the width direction D2 and between the two sets of discharge rollers 31a.

Each of the swinging members 7 has a connecting portion 71 and an arm portion 72. The connecting portion 71 is provided in the specific portion 621a of the shaft portion 621. The arm portion 72 is formed so as to extend from the connecting portion 71 toward the discharge tray 1x.

The arm portion 72 is swingably connected to the connecting portion 71 to the outside in the width direction D2. The arm portion 72 can swing up and down about the specific portion 621a of the shaft portion 621. Further, the arm portion 72 is swingably connected to the connecting portion 71 from the reference posture extending toward the discharge tray 1x to the outside in the width direction D2. 2 and 3 show the arm portion 72 in the reference posture.

In the present embodiment, the connecting portion 71 has a convex support shaft 711, and the arm portion 72 is formed with a through hole 721 through which the support shaft 711 is inserted.

The support shaft 711 is a protrusion along the direction orthogonal to the width direction D2. Further, at the tip of the support shaft 711, a retaining portion 712 is formed to prevent the support shaft 711 from coming out of the through hole 721.

When the seat 9 is discharged from the discharge port 30a, the rocking member 7 comes into contact with the discharging seat 9 on the downstream side of the sheet discharge direction D1 with respect to the corrugation member 61. At this time, the rocking member 7 is temporarily pushed up by the pressure received from the sheet 9 being discharged, and then descends to the original position.

After that, when the sheet 9 is loaded on the discharge tray 1x to a level where it comes into contact with the swing member 7, each of the arm portions 72 is pushed up by the sheet 9 loaded on the discharge tray 1x. At that time, each of the arm portions 72 swings upward around the connecting portion 71.

The sheet 9 passing through the discharge port 30a is deformed upward in a convex shape by contact with the central corrugation member 611 at the central reference position P0 in the width direction D2 (see FIG. 2). In this case, the two arm portions 72 come into contact with the slopes on both sides of the convexly deformed portion on the upper surface of the seat 9.

Since the two arm portions 72 do not come into contact with the crown portion of the convexly deformed portion on the upper surface of the seat 9, it is difficult to crush the wavy shape of the seat 9.

Further, the discharging sheet 9 applies a pressing force in the diagonal direction from the lower side toward both outer sides of the width direction D2 to each of the arm portions 72, and the two arm portions 72 are moved upward by the force received from the seat 9. At the same time as being pushed up, it is pushed up to both outer sides in the width direction D2. As a result, the tip portions of the two arm portions 72 are displaced to a portion on the upper surface of the seat 9 on the extension line in the seat discharge direction D1 with respect to the positions of the two sets of discharge rollers vs. 31a.

That is, each of the arm portions 72 is pushed upward by the discharging sheet 9 and swings outward in the width direction D2 by contact with the upper surface of the sheet 9 to which the waveform is applied.

By swinging outward on both sides in the width direction D2, the two arm portions 72 come into contact with a portion of the upper surface of the seat 9 that is deformed in a convex shape and is further away from the crown portion. Therefore, it is more reliably prevented that the rocking member 7 crushes the wavy shape of the sheet 9 formed by the action of the corrugation member 61.

In the present embodiment, each arm portion 72 of the swing member 7 has an arm base portion 720 and an arm extension portion 73.

The arm base 720 is a rubber member connected to the connecting portion 71. A through hole 721 through which the support shaft 711 is inserted is formed in the arm base 720. The arm base 720 is formed so as to extend from the connecting portion 71 toward the discharge tray 1x.

The arm extension portion 73 is a film-like flexible resin member attached to the arm base portion 720. The arm extension portion 73 is formed so as to extend from the tip of the arm base portion 720 toward the discharge tray 1x.

The arm extension portion 73 is a member that is thinner and softer than the arm base portion 720. By adopting the arm portion 72 in which the arm base portion 720 and the arm extension portion 73 are combined, the damage that the seat 9 receives due to the contact with the arm portion 72 is reduced.

In the example shown in FIG. 4, the arm extension portion 73 is attached to the surface of the arm base portion 720 on the upstream side in the seat discharge direction D1. As a result, the tip of the sheet 9 passing through the discharge port 30a comes into contact with the arm extension portion 73 having a frictional resistance smaller than that of the arm base portion 720. As a result, the damage that the seat 9 receives due to the contact with the arm portion 72 is further reduced.

[Application example]
Next, the sheet discharging device 6X according to the application example of the sheet discharging device 6 will be described with reference to FIGS. 5 and 6.

The seat discharging device 6X has a configuration in which the two swinging members 7 in the seat discharging device 6 are replaced with the two swinging members 7X.

Each of the swinging members 7X includes an urging portion 74 and a facing plate 75. That is, the seat discharging device 6X includes two urging portions 74 and two facing plates 75 provided corresponding to the two swinging members 7X.

The urging portion 74 is a flexible film-like member. The urging portion 74 is formed so as to extend outward in the width direction D2 from the arm base portion 720. The facing plate 75 is formed integrally with the connecting portion 71 and faces the urging portion 74. The facing plate 75 is arranged outside the connecting portion 71 in the width direction D2.

When the arm portion 72 swings outward in the width direction D2, the urging portion 74 bends by abutting against the facing plate 75. The reaction force that the urging portion 74 receives from the facing plate 75 due to bending is a force that urges the arm portion 72 inward in the width direction D2. That is, the urging portion 74 elastically biases the arm portion 72 swinging outward in the width direction D2 inward in the width direction D2. As a result, the urging portion 74 elastically urges the arm portion 72 in the direction of returning to the reference posture.

By providing the urging portion 74, it is possible to prevent the arm portion 72 from being displaced outward in the width direction D2 and not returning to the original position after the seat 9 has passed.

In this application example, one film member 730 attached to each arm base 720 of the swing member 7X includes an arm extension 73 and an urging portion 74. This reduces the number of parts and makes it relatively easy to assemble the swing member 7X.

1: Main body 1x: Displacement tray 2: Sheet accommodating part 3: Sheet transporting device 4: Image drawing device 5: Transfer device 6: Sheet discharging device 6X: Sheet discharging device 7: Rocking member 7X: Rocking member 9: Sheet 10: Image forming apparatus 30: Sheet transport path 30a: Displacement port 31: Transport roller pair 31a: Displacement roller pair 40: Printing device 41: Photoreceptor 42: Charging device 43: Developing device 45: Drum cleaning device 46: Optical scanning device 48: Secondary transfer device 49: Fixing device 51: Intermediate transfer belt 52: Belt support roller 53: Belt cleaning device 54: Primary transfer device 61: Corrugation member 61a: Convex portion 62: Rotating member 63: Full detection sensor 71: Connecting part 72: Arm part 73: Arm extension part 74: Biasing part 75: Facing plate 300: Sending roller pair 310: Roller shaft 611: Central corrugation member 612: Outer corrugation member 621: Shaft part 621a: Specific part of shaft part 622: Displacement part 622a: Detected part 711: Support shaft 712: Retaining part 720: Arm base 721: Through hole 730: Film member D1: Sheet discharge direction D2: Width direction P0: Reference position P1: First position P2: Second position

Claims (5)

Two sets of discharge roller pairs, which are arranged at intervals in the width direction of the discharge port of the sheet transport path and discharge the sheet from the discharge port onto the discharge tray,
A corrugation member arranged between the two sets of discharge rollers in the width direction, contacting the lower surface of the sheet passing through the discharge port, and imparting a waveform to the sheet.
A shaft portion arranged above the discharge port along the width direction and rotatably supported, and a sheet formed so as to extend from the shaft portion toward the discharge tray and loaded on the discharge tray. A rotating member having two swinging members that come into contact with the upper surface of the tray and are pushed up by the contacted sheet.
A full detection sensor for detecting that at least one of the two swinging members has been pushed up beyond a predetermined allowable level is provided.
The two swinging members are provided on both sides of the corrugation member in the width direction of the shaft portion and at specific portions between the two sets of discharge roller pairs, respectively.
Each of the swing members
A connecting portion provided at the specific portion of the shaft portion and a connecting portion
From the reference posture extending from the connecting portion toward the discharge tray, swinging up and down around the specific portion of the shaft portion, and extending toward the discharge tray with respect to the connecting portion. It has an arm portion that is swingably connected to the outside in the width direction.
The arm portion contacts the sheet passing through the discharge port on the downstream side of the corrugation member in the sheet discharge direction, and comes into contact with the upper surface of the sheet to which the waveform is applied, so that the arm portion is in the width direction. A sheet discharging device that swings outward, is pushed up by the sheet by coming into contact with the upper surface of the sheet loaded on the discharging tray, and swings upward around the connecting portion. The first aspect of the present invention further comprises two urging portions provided corresponding to the two oscillating members and elastically urging the arm portion oscillating outward in the width direction in a direction of returning the arm portion to the reference posture. The described sheet ejector. The arm portion of each of the swing members is attached to a rubber arm base connected to the connecting portion and an upstream surface of the arm base in the discharge direction, and the discharge tray is attached from the tip of the arm base. The sheet ejecting apparatus according to claim 1, further comprising a film-like flexible arm extension portion extending toward. Each of the swing members
A facing plate arranged outside the width direction with respect to the connecting portion,
A flexible urging portion formed extending outward from the arm base in the width direction is provided.
According to claim 3, when each of the arm portions swings outward in the width direction, the urging portion abuts on the facing plate and elastically urges the arm portion in a direction of returning to the reference posture. The described sheet ejector. A printing device that forms an image on a sheet transported along a sheet transport path,
An image forming apparatus including the sheet discharging device according to any one of claims 1 to 4, wherein the sheet after image formation is discharged from a discharge port of the sheet transport path onto a discharge tray.

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