JP2002241028A - Paper delivery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper delivery device capable of preventing damage of paper, and capable of excellently stacking the paper. SOLUTION: This paper delivery device 1 has a delivery tray 13a for placing the paper, and a pair of delivery rollers 11a for delivering the paper P1 forming an image by a printer 3 to the delivery tray 13a, and has a filler 25 in the vicinity of the pair of delivery rollers 11a for pressing down a rear end part of the paper P2 on the delivery tray 13a. The filler 25 pushes down the rear end part of the paper P2 on the delivery tray 13a from above by abutting to a tip part of the paper P1 forming the image by the printer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discharging device for discharging a sheet from an image forming apparatus such as a copying machine, a printer, a facsimile or the like.

[0002]

2. Description of the Related Art Generally, a paper discharge device receives paper from an image forming apparatus such as a copying machine, a printer, a facsimile or the like, and discharges the paper to a discharge tray by a discharge roller pair.
Paper is stacked on the paper discharge tray. As such a sheet discharging device, there are JP-A-4-298450, JP-A-5-294530, and JP-A-6-189062.

In Japanese Patent Application Laid-Open No. 4-298450, a pressing member whose leading end is urged toward a paper discharge tray is provided, and the paper is conveyed toward the paper discharge tray while being sandwiched between a pair of paper discharge rollers. When the leading edge of the pressing member presses the paper against the paper ejection roller and the paper passes through the pair of paper ejection rollers, the leading end of the pressing member knocks the rear end of the paper toward the paper ejection tray, There is disclosed a technique (Prior Art 1) for surely placing a sheet on a discharge tray.

In Japanese Patent Application Laid-Open No. 5-294530, a lower discharge roller of a pair of discharge rollers is formed in a gear shape, and a sheet is conveyed toward a discharge tray while being sandwiched between the pair of discharge rollers. When the sheet is pressed, the paper is pressed against the gear-shaped discharge roller by the pressing member, and the rear end of the paper passing through the nip of the pair of discharge rollers enters between the teeth of the gear-shaped discharge roller, thereby causing the gear. There is disclosed a technique (prior art 2) in which a paper discharge roller having a shape guides the rear end of a sheet toward a paper discharge tray.

In Japanese Patent Application Laid-Open No. 6-189062, a pressing member is provided for pressing a sheet discharged onto a discharge tray from above, and a sheet conveyed toward the discharge tray by a pair of discharge rollers is provided. A technology (conventional technology 3) has been disclosed in which a sheet is conveyed while being pressed by a pressing member and is stacked on a sheet discharge tray.

[0006]

However, in the prior arts 1 and 3, the paper being conveyed by the paper discharge roller pair is pressed by the pressing member, so that the paper is discharged by the paper discharge roller pair. 11, the sheet is curled (knotted), and therefore, as shown in FIG. 11, the rear end of the sheet S1 stacked on the sheet discharge tray 100 may be curled. In this case, the rear end of the paper S1 stacked on the paper output tray 100 is in a state of closing the exit side of the nip N of the paper output roller pair 101, and is conveyed by the paper output roller pair 101. Paper S2 is
There is a problem that the sheet S1 closing the exit side of the nip N of the sheet discharge roller pair 101 is pushed out, the sheets stacked on the sheet discharge tray 100 become irregular, and the stacking property is deteriorated.

In the prior art 2, the rear end of the paper is locked between the teeth of the gear-shaped paper discharge roller and guided to the paper discharge tray, so that the rear end of the paper rubs against the gear. Paper is easily damaged, and the trailing edge of the paper is easily pulled out between the gear teeth, and the paper that has come off blocks the exit side of the nip of the paper discharge roller pair. There is a problem that the property deteriorates.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet discharging apparatus which can prevent the sheet from being damaged and can stack the sheets satisfactorily.

[0009]

According to a first aspect of the present invention, there is provided a paper discharge tray on which paper is placed, and a paper discharge roller pair for discharging paper on which an image is formed by the image forming apparatus to the paper discharge tray. In the sheet discharging apparatus, a pressing member is provided in the vicinity of the pair of discharging rollers for pressing the trailing end of the sheet on the sheet discharging tray, and the pressing member contacts the leading end of the sheet on which an image is formed by the image forming apparatus. The contact makes it possible to push down the rear end of the paper on the paper discharge tray from above.

According to the first aspect of the present invention, the pressing member pushes down the rear end of the paper stacked on the paper discharge tray from above, so that the rear end of the paper in the paper discharge tray is set to the paper discharge roller pair. Can prevent the exit side of the nip from being blocked, and the paper ejected toward the paper output tray by the paper output roller pair pushes out the paper in the paper output tray, causing the paper stacked in the paper output tray to become uneven. Can be prevented, and sheets can be satisfactorily stacked.

Further, the pressing member only presses the rear end of the paper in the paper discharge tray in conjunction with the paper being discharged, and does not press the paper being discharged. Since it is possible to prevent the sheet from being affected, it is possible to prevent the sheet from being curled and to prevent the sheet from being damaged.

According to a second aspect of the present invention, in the first aspect of the present invention, the pressing member is rotatable between a pressing position for holding the sheet on the paper discharge tray and a retracting position for retracting from the pressing position. The pressing member is urged toward the evacuation position, and the pressing member is rotated from the evacuation position toward the pressing position by being pressed by the leading end of the sheet moving toward the paper discharging tray, and is pressed toward the paper discharging tray. Is characterized by pushing down the rear end of the sheet from above.

According to the second aspect of the present invention, the first aspect is provided.
When the paper is being discharged to the paper output tray, the pressing member is pressed by the paper and moves from the retracted position to the pressed position, thereby forming the paper in the paper output tray. Push down on the rear end. Then, when the paper pressing the pressing member is placed on the paper discharge tray, the pressing member moves from the pressing position to the retracted position,
Thereafter, the same operation is repeated.

By simply providing the holding member rotatably between the pressing position and the retracted position and biasing the pressing member toward the retracted position, the paper in the paper discharge tray is interlocked with the paper discharged to the paper discharge tray. Since it can be pushed down and there is no need to separately provide a complicated interlocking mechanism, the configuration is simple and the cost can be reduced.

[0015] The third aspect of the present invention is the first or second aspect.
In the invention described in (1), the pressing member is provided at a position for pressing both edges of the paper placed on the paper discharge tray.

According to the third aspect of the present invention, the first aspect is provided.
Or the same effect as the invention described in 2 above, and since the pressing member is provided at a position for pressing both edges of the paper placed on the paper discharge tray, the rear end of the paper of the paper discharge tray is provided. Can be suppressed more reliably. In particular, even if not only the trailing edge of the paper in the paper discharge tray but also the edge thereof is curled, the paper can be reliably pressed, and the stacking property is further improved.

The invention described in claim 4 is the first to third aspects of the present invention.
In the invention described in any one of the above, a high friction member is provided at a pressing portion of the pressing member against the sheet.

According to the fourth aspect of the present invention, in the first aspect,
In addition to providing the same function and effect as the invention described in any one of (3) to (3), since the high friction member is provided in the pressing portion of the pressing member, the friction between the paper being discharged and the top sheet of the paper in the discharge tray is caused by the friction. In addition, it is possible to prevent the paper in the paper discharge tray from shifting, and the stacking property is further improved.

The invention described in claim 5 provides the invention according to claims 1 to 3
In the invention according to any one of the above, an elastic member is provided at a pressing portion of the pressing member against the sheet.

According to the fifth aspect of the present invention, the first aspect is provided.
In addition to providing the same function and effect as the invention described in any one of (3) to (3), the provision of the elastic member in the pressing portion of the pressing member increases the contact area of the paper in the paper discharge tray with the uppermost paper. It is possible to prevent the paper in the paper output tray from shifting due to the friction between the paper and the uppermost paper of the paper in the paper output tray, and the stacking property is further improved.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, a high friction member is provided at a position where the elastic member presses the sheet of the sheet discharge tray.

According to the sixth aspect of the present invention, there is provided the fifth aspect of the present invention.
And the high friction member is provided at the position where the elastic member is pressed, so that the sheet on the sheet discharge tray can be pressed more reliably, and the stacking property is further improved.

The invention according to claim 7 is the invention according to claims 1 to 6
The invention according to any one of the above, further comprising detecting means for detecting the position of the pressing member, wherein the paper jam is detected when the position of the pressing member detected by the detecting means does not change for a predetermined time.

According to the seventh aspect of the present invention, in the first aspect,
In addition to the same effect as the invention described in any one of (1) to (6), for example, the detecting means detects a state in which the pressing member keeps pressing the paper in the paper discharge tray for a predetermined time, or If the detecting means cannot detect the state in which the pressing member is pressing the discharge tray even after a certain period of time has passed after the paper is sent from the image forming apparatus, the paper is jammed, Various types of paper jam processing are performed by signals from the means. in this way,
Just providing a detection means to detect the position of the holding member,
Paper jam can be detected. Further, the configuration is simple, and the cost can be reduced.

[0025]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a configuration diagram schematically showing a sheet discharging device according to the present invention. As shown in FIG. 1, the paper discharge device 1 is mounted on a printer (image forming device) 3. Printer 3
An image is formed on a sheet P passing through a transport path indicated by a two-dot chain line, and the sheet P on which an image is formed by the printer 3 is discharged to a discharge unit 5 of the printer 3, or
The paper is delivered to the paper discharge device 1.

The paper discharge device 1 includes a transport path 10 through which the paper P from the printer 3 passes, a first discharge portion 15a, a second discharge portion 15b, a third discharge portion 15c, and a fourth discharge portion. The transport path 10 includes four transport rollers 7.
a, 7b, 7c, 7d are arranged in series in the vertical direction, and between the transport rollers 7a, 7b, 7c, 7d, three switching claws 9a for switching the transport direction of the paper P,
9b and 9c are provided.

Next, the first to fourth paper output units 15a, 15
b, 15c, and 15d will be described. However, since they have substantially the same configuration, only the lower first discharge unit 15a will be described, and the second to fourth discharge units 15b, 15c, and 15d will not be described.
The same parts as those of the first paper output unit 15a are denoted by the same reference numerals, and the description thereof will be omitted.
5a is appended with “a” after the number, the second paper discharge unit 15b is appended with “b” after the number, and the third paper discharge unit 15c is appended with “c” after the number. The four paper discharge units 15d are distinguished by adding "d" after the number.

The first paper discharge section 15a receives the paper P1 guided by the switching claw 9a from the transport roller 7a and discharges the paper P1, and the paper P2 discharged from the paper discharge roller pair 11a. Output tray 11 to be (stacked)
a.

As shown in FIG. 2, the discharge roller pair 11a
Is composed of a paper discharge drive roller 17a rotated by driving from a drive source (not shown) and a driven roller 19,
The sheet P <b> 1 (see FIG. 4) conveyed from the conveying roller 7 a by the switching claw 9 a includes an upper guide plate 21 and a lower guide plate 23.
And the discharge drive roller 17a and the driven roller 1
9 and is discharged to the discharge tray 13a while being pinched.
In FIG. 2, a filler 25 described later is omitted.

As shown in FIGS. 3 and 4, a filler (pressing member) 25 for pressing the rear end of the sheet P2 placed on the sheet discharge tray 13a is provided between the sheet discharge drive rollers 17a. I have. The holding member 25 is rotatable around a fulcrum 26 between a pressing position for pressing the sheet P2 (see FIG. 5) and a retreating position (see FIG. 4) for retreating from the pressing position. The position is always biased.

In the present embodiment, the filler 25 pushes down a substantially central position in the width direction of the paper P2 placed on the paper output tray 13a by the pressing portion 29, so that the rear end of the paper P2 is discharged. Nip N of roller pair 11a
It can be pushed down below.

Next, the operation of the present embodiment will be described based on the above configuration. When the paper discharge destination of the printer 3 is the first paper discharge unit 15a, the operation unit (not shown) of the printer 3 is operated to change the paper discharge destination to the first paper discharge unit 15a.
a. After the printer 3 completes the image formation on the paper, the lowermost transport roller pair 7a receives the paper P1 sent from the printer 3 and transports the paper P1 upward.

The sheet P1 conveyed by the pair of conveying rollers 7a is guided toward the pair of discharging rollers 11a by the switching claw 9a. As shown in FIG. 4, the leading end of the sheet P1 pushes the filler 25 to form the filler 2
5 rotates from the retracted position in FIG. 4 to the pressed position in FIG. As a result, as shown in FIG. 5, the pressing portion 29 of the filler 25 presses the rear end of the paper P2 already stacked on the paper discharge tray 13a from above, and curls (face curl).
This prevents the trailing end of the sheet P2 from blocking the exit side of the nip with the sheet discharge roller pair 11a.

Then, the sheet P1 is discharged from the sheet discharge drive roller 17a.
Is discharged toward the discharge tray 13a while being nipped by the driven rollers 19a, and is placed on the uppermost sheet P2 of the sheets stacked on the discharge tray 13a. When the sheet P1 pressing the filler 25 is placed on the sheet discharge tray 13a,
The filler 25 rotates from the pressed position to the retracted position by the urging force of the spring 27, and thereafter repeats the same operation.

As described above, the filler 25 presses the rear end of the sheet P2 already loaded on the sheet discharge tray 13a below the nip of the pair of sheet discharge rollers 11a, so that the rear end of the sheet P2 is formed. Since it is possible to prevent the exit side of the discharge roller pair 11a from being blocked, it is possible to prevent the sheet P1 discharged toward the discharge tray 13a by the discharge roller pair 11a from pushing out the sheet P2 of the discharge tray 13a. Thus, the sheets can be properly stacked on the sheet discharge tray 13a.

Further, the filler 25 is used for the paper P1 being discharged.
Only the sheet P2 of the sheet discharge tray 13a is pressed in conjunction with the sheet ejection, and the sheet P1 being discharged is not pressed, thereby preventing the sheet discharge roller pair 11a from affecting the discharge of the sheet P1. , The curling of the paper P1 being discharged can be prevented, and the paper P
1 can be prevented from being damaged.

Next, another embodiment will be described. In the description, the same parts as those described above are denoted by the same reference numerals, and the description thereof will be omitted.

FIG. 6 is a perspective view schematically showing a first sheet discharging section according to the second embodiment. The second embodiment differs from the first embodiment in that a plurality of fillers 25 are provided at positions that press both edges of the sheets P2 stacked on the sheet discharge tray 13a, as shown in FIG. .

In this embodiment, the filler 25 is made of A5
Two locations in position A that can support Y (horizontal) size, A4T (vertical) size, and B5T size paper, B5Y size, A4
Two locations are provided at a position B that can accommodate a Y-size A3T size sheet, for a total of four locations. In FIG. 6,
The sheet P2 is an A5Y size or A4T size sheet.

As described above, by providing the filler 25 at a position where both edges of the sheet P2 are pressed, the rear end of the sheet P2 stacked on the sheet discharge tray 13a can be pressed more reliably. In particular, as shown in FIG. 6, even if the edge of the sheet P2 is curled (side face curl) as well as the rear end thereof, the sheet P2 can be reliably pressed and the stacking property is further improved.

FIG. 7 is a view schematically showing the configuration of a first sheet discharging section according to the third embodiment. The third embodiment is different from the first embodiment in that a rubber (high friction member) 31 is provided in the pressing portion 29 of the filler 25 as shown in FIG. The high-friction member is not limited to the rubber 31, and may be, for example, cork or a member in which the pressing portion 29 is provided with a ceramic coating.

As described above, since the rubber 31 of the filler 25 presses the rear end of the sheet (uppermost sheet) P2 of the sheet discharge tray 13a, the leading end of the sheet P1 being discharged is in contact with the sheet discharge tray 13a.
a, the paper P2 is prevented from slipping out due to the friction between the lower surface of the paper P1 being discharged and the upper surface of the uppermost paper P2 of the paper discharge tray 13, and the stacking property is further improved. become.

FIG. 8 is a view schematically showing the configuration of a first sheet discharge section according to the fourth embodiment. The fourth embodiment differs from the first embodiment in that a sponge (elastic member) 33 is provided in the pressing portion 29 of the filler 25 as shown in FIG. Note that the elastic member is not limited to the sponge 33, and for example, mylar may be used.

As described above, when the sponge 33 of the filler 25 presses the rear end of the sheet (uppermost sheet) P2 of the discharge tray 13a, the contact area with the sheet P2 stacked on the discharge tray 13a is reduced. As the number of sheets increases, the leading end of the sheet P1 being discharged lands on the sheet P2 of the sheet discharge tray 13a, and the sheet P2 is displaced by friction between the lower surface of the sheet P1 being discharged and the upper surface of the sheet P2 of the sheet discharge tray 13a. Deviation can be prevented, and the stackability can be improved.

FIG. 9 is a view schematically showing the configuration of a first sheet discharging section according to the fifth embodiment. In the fifth embodiment, as shown in FIG. 9, the rubber 31 is attached to the position where the filler 25 presses the sponge 33 against the paper.
Different from the embodiment. In this way, by providing the sponge 33 as an elastic member and the rubber 31 as a high friction member in combination, the contact area of the paper discharge tray 13a with the paper P2 is further increased, and the paper P2 is more reliably pressed. And the stacking property is further improved.

FIG. 10 is a view schematically showing the configuration of a first sheet discharging section according to the sixth embodiment. In the sixth embodiment,
As shown in FIG. 10, a plate member 37 for jam detection is provided on the filler 25, a jam detection sensor (detection means) 39 for detecting the presence or absence of the plate member 37 is provided, and the position of the filler 25 is detected by the jam detection sensor 39. The detection differs from the first embodiment. In the present embodiment,
The jam detection sensor 39 is an optical sensor, but is not limited to this.

When the filler 25 is at the pressing position indicated by the two-dot chain line, the plate member 37 of the filler 25 shields the jam detection sensor 39, and when the filler 25 is at the retracted position indicated by the solid line, the plate member 37 activates the jam detection sensor 39. Move away from the shielding position.

As a result, the sheet P1 is discharged from the discharge roller pair 1
Whether or not the sheet is being conveyed can be determined by 1a. That is, even if a certain period of time has elapsed since the jam detection sensor 39 detected the plate member 37, the filler 25 did not return to the retracted position, or a certain period of time elapsed after the printer 3 formed an image on a sheet. Also jam detection sensor 3
When the sheet 9 does not detect the plate member 37 (when the filler 25 is at the retracted position), a paper jam (jam) has occurred, and a control unit (not shown) that has received a signal from the jam detection sensor 39 Accordingly, it is possible to perform appropriate jam processing by performing notification (warning lamp, buzzer, or the like) indicating that jam detection has been performed.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, the arrangement position of the filler 25 is not limited to the above-described embodiment, and can be rotated between the pressed position and the retracted position by being pressed by the sheet P1 discharged to the discharge tray 13a. The position may be any position, and in particular, it is desirable to be near the discharge roller pair 11a.

In the second embodiment, four fillers 25 are provided at positions for pressing both edges of the sheet P2. However, the number of fillers 25 is not limited to this, and is set according to the sheet size. It can be changed as appropriate.

In the sixth embodiment, when the filler 25 is at the pressing position, the detection sensor 39 detects the plate member 37. However, when the filler 25 is at the retracted position, the detection sensor 39 detects the plate member 37. The plate member 37 may be provided on the filler 25 so as to detect 37. Further, the jam detection sensor 39 may directly detect the position of the filler 25 without providing the plate member 37.

Although the present invention has been applied to the printer 3, the present invention is not limited to this. For example, a similar effect can be obtained even when applied to a copying machine, a facsimile, or a multifunction peripheral thereof.

[0053]

According to the first aspect of the present invention, the pressing member pushes down the rear end of the paper stacked on the paper discharge tray from above, so that the rear end of the paper in the paper discharge tray is discharged. As it can prevent blocking the exit side of the paired nip,
It is possible to prevent the paper ejected toward the paper output tray by the paper ejection roller pair from pushing out the paper in the paper output tray to prevent the paper stacked in the paper output tray from becoming uneven, and to stack the paper well. Can be.

Further, the pressing member only presses the rear end of the paper in the paper discharge tray in conjunction with the paper being discharged, and does not press the paper being discharged. Since it is possible to prevent the sheet from being affected, it is possible to prevent the sheet from being curled and to prevent the sheet from being damaged.

According to the second aspect of the invention, the same effect as that of the first aspect of the invention is provided, and the holding member is provided rotatably between the pressing position and the retracted position and is directed toward the retracted position. By simply urging the paper, the paper in the paper output tray can be pushed down in conjunction with the paper being discharged to the paper output tray, and there is no need to provide a separate complicated interlocking mechanism. Reduction can be achieved.

According to the third aspect of the present invention, the same effect as that of the first or second aspect of the present invention is obtained, and the pressing member is moved to a position for pressing both edges of the paper placed on the paper discharge tray. Since the sheet is provided, the rear end of the sheet in the sheet discharge tray can be more reliably pressed. In addition, even if not only the trailing edge of the paper in the paper discharge tray but also the edge thereof is curled, the paper in the paper discharge tray can be reliably pressed, and the stacking property is further improved.

According to the fourth aspect of the present invention, the same effects as those of the first to third aspects are obtained, and the high friction member is provided at the pressing portion of the pressing member. It is possible to prevent the paper in the paper output tray from shifting due to the friction between the paper and the uppermost paper of the paper in the paper output tray, and the stacking property is further improved.

According to the fifth aspect of the present invention, the same effects as those of the first to third aspects of the invention are obtained, and the elastic member is provided on the pressing portion of the pressing member, so that the paper on the paper discharge tray is provided. Increases the area of contact with the uppermost sheet of paper, so that the paper in the paper output tray can be prevented from shifting due to the friction between the paper being discharged and the uppermost paper of the paper in the paper output tray, and the stackability can be further improved. Become.

According to the sixth aspect of the present invention, the same effects as those of the fifth aspect of the invention can be obtained, and the high friction member is provided at the position where the elastic member is pressed, so that the paper in the paper discharge tray can be more reliably provided. Can be suppressed, and the stacking property is further improved.

According to the seventh aspect of the present invention, the same effects as those of the first to sixth aspects of the invention can be obtained, and the paper jam can be detected only by providing the detecting means for detecting the position of the pressing member. can do. Further, the configuration is simple, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a sheet discharge device according to the present invention.

FIG. 2 is a perspective view illustrating the vicinity of a discharge roller pair.

FIG. 3 is a perspective view illustrating a state where sheets are stacked on a sheet discharge tray.

FIG. 4 is a diagram illustrating a state in which a pressing member is at a retracted position.

FIG. 5 is a diagram illustrating a state in which a pressing member at a pressing position presses a rear end of a sheet.

FIG. 6 is a perspective view schematically showing a first sheet discharging unit according to a second embodiment.

FIG. 7 is a configuration diagram schematically showing a first paper discharge unit according to a third embodiment.

FIG. 8 is a configuration diagram schematically showing a first paper discharge unit according to a fourth embodiment.

FIG. 9 is a configuration diagram schematically showing a first paper discharge unit according to a fifth embodiment.

FIG. 10 is a configuration diagram schematically showing a first paper discharge unit according to a sixth embodiment.

FIG. 11 is a view for explaining a problem of a conventional paper discharge device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper discharger 3 Printer (image forming apparatus) 11a, 11b, 11c, 11d Discharge roller pair 13a, 13b, 13c, 13d Discharge tray 25 Filler (pressing member) 19 Pressing part 31 Rubber (high friction member) 33 Sponge ( Elastic member) 39 Jam detection sensor (detection means)

Claims (7)

[Claims] 1. A sheet discharging apparatus comprising: a sheet discharging tray on which a sheet is placed; and a sheet discharging roller pair for discharging a sheet on which an image is formed by an image forming apparatus to a sheet discharging tray. A holding member for holding a rear end portion of the paper on the paper output tray, and the pressing member is configured to contact a front end portion of the paper on which the image is formed by the image forming apparatus to thereby cause the rear end of the paper on the paper output tray to be in contact with the paper. A paper discharge device characterized in that a paper section is pushed down from above. 2. The pressing member is rotatable between a pressing position for pressing a sheet on a discharge tray and a retracted position retracted from the pressing position, and is urged toward the retracted position. The sheet is moved from the retracted position to the pressed position by being pushed by the leading end of the sheet moving toward the paper tray, thereby pushing down the rear end of the sheet in the sheet ejection tray from above. Item 2. The sheet discharging device according to Item 1. 3. The sheet discharging device according to claim 1, wherein the pressing member is provided at a position for pressing both edges of the sheet placed on the sheet discharging tray. 4. The pressing portion of the pressing member against the sheet includes:
2. A high friction member is provided.
4. The paper discharge device according to any one of claims 1 to 3. 5. The pressing portion of the pressing member against the sheet includes:
4. The sheet discharging device according to claim 1, further comprising an elastic member. 6. The sheet discharge device according to claim 5, wherein a high friction member is provided at a position where the elastic member presses the sheet on the sheet discharge tray. 7. A paper jam according to claim 1, further comprising detecting means for detecting the position of the pressing member, wherein the paper jam is detected when the position of the pressing member detected by the detecting means does not change for a predetermined time. A paper discharge device according to any one of the above.