JP6245004B2 - Paper discharge device and image forming apparatus - Google Patents

Description

  The present invention relates to a paper discharge device that discharges a sheet from a discharge portion to a paper discharge tray portion, and an image forming apparatus that includes a copier, a printer, a facsimile, and a multi-function peripheral using such a paper discharge device. In particular, even when the paper is discharged from the discharge portion to the paper discharge tray portion, the curled paper is corrected to a flat state in the paper discharge tray portion, and the paper discharge tray portion is in an appropriate state. It is characterized by the point that it is loaded on.

  In an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a combination of these, in general, a paper on which a toner image is formed is discharged from a discharge unit to a discharge tray in order from a discharge unit. The printed paper is stacked on the paper discharge tray.

  Here, in the image forming apparatus, when the toner image is pressed and heated on the sheet by the fixing device and fixed, the sheet may curl in the direction intersecting the sheet feeding direction, that is, the sheet width direction. there were.

  Then, when the paper curled in the width direction of the paper in this way is sequentially discharged from the discharge portion to the discharge tray portion as described above, it is discharged first to the discharge tray portion in such a curled state. The next paper ejected from the ejection section hits the paper that is being ejected, and the next paper is no longer ejected to the output tray section, resulting in a paper jam or being ejected first to the output tray section. There is a problem that the sheet is pushed by the next sheet and is displaced, and the sheet cannot be properly stacked on the sheet discharge tray unit.

  Conventionally, as shown in Patent Document 1, a guide member is provided on the downstream side of the discharge portion, and the end guide portions on both sides in the width direction orthogonal to the discharge direction of the guide member are discharged from the discharge portion. The both end portions of the paper to be discharged are bent to the center side along the end guide portions on both sides in the width direction, and the both end portions of the paper discharged from the discharge portion are brought into contact with the end guide portions on both sides in the width direction. The two end portions of the paper curled concavely in the width direction of the paper are bent toward the center along the edge guide portions on both sides to correct the paper curled concavely. Proposed.

  Here, in the image forming apparatus, when a toner image is formed on a sheet as described above, it depends on the configuration of the fixing device, the configuration of the conveyance path for conveying the sheet, the type of the sheet, and environmental conditions such as temperature and humidity. The direction and amount of paper curling are not constant, and the paper may be curled convexly in addition to being curled concavely in the paper width direction.

  However, since the one disclosed in Patent Document 1 is such that both end portions of a sheet curled in a concave shape are bent toward the center along the end guide portions on both sides, the sheet is convex as described above. When the paper is curled, it is impossible to press the center of the convex paper and correct the convex paper properly. For this reason, in the case of a sheet curled convexly in the width direction of the sheet, the next sheet hits the previous sheet discharged to the sheet discharge tray portion as described above, and the next sheet is discharged to the sheet discharge tray. The paper is not ejected to the paper, causing paper jams, or the paper that was previously ejected to the paper output tray is pushed by the next paper and shifted, and the paper is not properly stacked on the paper output tray. The problem still existed.

  Further, in Patent Document 2, in order to detect the full state of the paper discharged and stacked on the paper discharge tray portion, a pressing member that presses the paper discharged from the discharge portion to the paper discharge tray portion from above is provided. Either the presser member that is in contact with the part where the paper stack is high or the fullness detection member is set so that the presser force of the paper by the presser member becomes stronger for the wide paper than for the narrow paper. On the other hand, the one that detects the full state of the paper is shown.

  However, this patent document 2 is intended to correct the curled paper in the case where the concavely curled paper or the convexly curled paper is discharged to the paper discharge tray section. However, the problem as described above cannot be solved.

  In Patent Document 3, when the curled paper is pressed by bringing the swinging portion of the rotatable presser lever or detection lever into contact with the paper discharged to the paper discharge tray, the presser lever or detection lever A weight is detachably provided on the swinging part on both sides, and the weight and position of the weight attached to the swinging part are changed so that the pressing force for pressing the curled paper can be easily adjusted. It is shown.

  However, in Patent Document 3, weights are detachably provided on the swinging portions on both sides of the presser lever and the detection lever, and by these swinging portions, the sheet curled in a concave shape in the width direction of the sheet is provided. Although it is shown that the paper curled in a concave shape is corrected by pressing the ends on both sides, as in the case of the above-mentioned Patent Document 1, correcting the paper curled in a convex shape appropriately In addition, it is troublesome to change the weight and position of the weight attached to the swinging portions on both sides of the presser lever and the detection lever according to the degree of curl in the paper.

JP 2006-248738 A JP 2005-96964 A JP 2004-115254 A

  An object of the present invention is to solve the above-described problem in a paper discharge device that discharges paper from a discharge portion to a paper discharge tray portion.

  That is, according to the present invention, in the paper discharge device as described above, even when the paper is curled from the discharge portion and discharged to the paper discharge tray portion, the curled paper is corrected to be flat in the paper discharge tray portion. Thus, it is an object of the present invention to allow the sheets to be stacked on the discharge tray unit in an appropriate state.

In the paper discharge device according to the present invention, in order to solve the above problems, in the paper discharge device that discharges the paper from the discharge portion to the paper discharge tray portion, the paper discharged from the discharge portion comes into contact with the upper and lower sides. As a presser member that swings in the direction and presses the paper ejected to the paper discharge tray, and a center presser member that presses the center in the width direction of the paper that intersects the paper discharge direction, and both sides of the central presser member. An end pressing member that presses the end of the sheet in the width direction, the pressing force of the end pressing member is made stronger than the pressing force of the central pressing member, and the width of the central pressing member is set to the end It is wider than the width of the presser member .

  And in this paper discharge device, when the paper is discharged from the discharge part in a state where both ends in the width direction are curled concavely in the width direction of the paper and the both ends of the paper are lifted, The presser force is stronger than that of the center presser member, and is pressed by the end presser members on both sides, so that the next paper is properly guided onto the previously discharged paper, The both end portions of the sheet that is lifted by the pressing member are strongly pressed, and the concavely curled sheet is corrected. Further, when the sheet is discharged from the discharge unit in a state where the sheet is curled convexly in the width direction of the sheet and the center part is lifted, the center part where the sheet is lifted is pressed by the center pressing member. The next sheet is properly guided onto the previously ejected sheet, and the central part of the floated sheet is pressed by the center pressing member and discharged to the discharge tray part. The paper curled into a convex shape is gradually corrected by its own weight.

Further, the sheet discharging device of the, as the presser member, the width of the central pressing member has a so that with those wider than the width of said end pressing member, curled convex Thus, the paper with the central part lifted up can be appropriately pressed by the wide central pressing member, and both end parts of the paper that has been curled concavely and lifted at both ends in the width direction are pressed by the end pressing member. In this case, the central portion of the sheet is appropriately prevented from being lifted by the central pressing member having the wide width .

Further , in another paper discharge device according to the present invention, in the paper discharge device for discharging the paper from the discharge portion to the paper discharge tray portion, the paper discharges from the discharge portion and swings in the vertical direction. As a pressing member for pressing the paper discharged to the paper discharge tray, a central pressing member for pressing the central portion in the width direction of the paper that intersects the paper discharging direction, and the width direction of the paper on both sides of the central pressing member, respectively. An end pressing member that presses the end, and strengthens the pressing force of the end pressing member more than the pressing force of the central pressing member, and the end pressing members provided on both sides of the central pressing member, Each was divided into a plurality in the width direction of the paper so as to correspond to the width of the paper .

  Further, when the presser member is provided so as to swing vertically in contact with the paper discharged from the discharge portion, the center presser member and the end presser member are respectively centered on the rotation fulcrum. The center pressing member and the end pressing member that are provided so as to be pivotable and extend from the rotation fulcrum in the paper discharge direction can have the same length. And, if the length of the center presser member and the end presser member that extend in the paper discharge direction from the rotation fulcrum is the same as described above, when the paper curls concavely in the width direction of the paper as described above, In any case where the paper is curled convexly in the width direction of the paper, the paper can be pressed in the same manner by the center pressing member and the end pressing member.

  In order to make the presser force of the end presser member stronger than the presser force of the center presser member as described above, a weight is attached to the end presser member, and the presser force of the end presser member is set to the presser force of the central presser member. Or a biasing member that biases the end pressing member toward the paper discharge tray, and the pressing force of the end pressing member is reduced by the pressing force of the center pressing member. Can be stronger.

  Further, an adjusting means for adjusting the pressing force by the end pressing member is provided, and by this adjusting means, the force for pressing the end of the paper by the end pressing member is changed according to the state of the curled paper or the like. Can do.

  In the image forming apparatus according to the present invention, the paper discharge device as described above is used when the paper on which the toner image is formed is discharged to the paper discharge tray by the paper discharge device.

  In the paper discharge device according to the present invention, as a pressing member that abuts on the paper discharged from the discharge portion and swings in the vertical direction and holds the paper discharged to the paper discharge tray portion, A center presser member that presses the center of the intersecting paper in the width direction and an end presser member that presses the end of the paper in the width direction on both sides of the center presser member are provided. Since the presser force of the presser member is increased, the curled paper is not removed even when the paper is curled concavely or convexly in the width direction of the paper and discharged from the discharge part to the paper discharge tray part. The curled paper is corrected to a flat state in the paper discharge tray portion by being properly pressed by the center press member and the end press member, and the paper is stacked on the paper discharge tray portion in an appropriate state.

1 illustrates an image forming apparatus and a paper discharge apparatus according to an embodiment of the present invention, and illustrates a state in which a toner image is formed on a sheet, and the sheet on which the toner image is formed is discharged from a discharge unit to a discharge tray unit by the discharge unit. FIG. FIG. 3 is a schematic perspective view illustrating a state in which a sheet discharged from a discharge unit to a discharge tray unit by a discharge roller is pressed by a pressing member in the sheet discharge device according to the first embodiment of the present invention. In the presser member used in the paper discharge device according to the first embodiment, the state where the end presser members that press the widthwise end portions of the paper are provided on both sides of the central presser member that presses the central portion in the widthwise direction of the paper. It is the shown schematic plan view. In the paper discharge device according to the first embodiment, (A) is a schematic front view showing a state in which the paper is curled concavely in the width direction and both ends in the width direction of the paper are lifted, and (B) is in the width direction. FIG. 5 is a schematic explanatory view showing a state in which a sheet curled in a concave shape is pressed by a pressing member and is corrected to be substantially flat on a sheet discharge tray portion. In the paper discharge device according to the first embodiment, (A) is a schematic front view showing a state in which the paper curls convexly in the width direction and the central portion in the width direction of the paper is raised, and (B) is the width direction. FIG. 6 is a schematic explanatory view showing a state in which a sheet of paper curled in a convex shape is pressed by a pressing member and is corrected to be substantially flat on the discharge tray portion. In the paper discharge device according to the first embodiment, the end pressing members provided on both sides of the central pressing member are divided into a plurality in the width direction of the paper so as to correspond to the widths of various sizes of paper. It is the schematic plan view which showed the state. In the presser member used in the paper discharge device according to the second exemplary embodiment of the present invention, an end presser member that presses the widthwise end of the paper is provided on both sides of the central presser member that presses the central part of the paper in the widthwise direction. FIG. 5 is a schematic plan view showing a state in which an end pressing member is biased toward a sheet discharge tray by a torsion coil spring. FIG. 6 is a partial perspective view showing a state in which the end pressing member is biased toward the discharge tray portion by a torsion coil spring in the pressing member used in the paper discharge device according to the second embodiment. In the presser member used in the paper discharge device according to the second embodiment, a sheet of paper stacked on the paper discharge tray unit is placed on one rotary shaft that extends laterally from the width direction end of the center presser member. It is the schematic explanatory drawing which showed the state which provided the detection sensor which detects the position of this actuator while attaching the actuator for detecting quantity. In the paper discharge device according to the second embodiment, a state in which the amount of paper stacked on the paper discharge tray unit is detected is shown. FIG. 9A shows a small amount of paper stacked on the paper discharge tray unit. FIG. 4B is a partial schematic explanatory view showing a state where the actuator is not detected by the detection sensor. FIG. 5B is a diagram illustrating a state where the amount of sheets stacked on the paper discharge tray portion exceeds a predetermined amount, and the actuator is detected by the detection sensor. It is the partial schematic explanatory drawing which showed the state. In the paper discharge device according to the second embodiment, a modification example in which the end pressing member is biased toward the paper discharge tray unit is shown, and the end pressing member is biased toward the paper discharge tray unit by the adjusting unit. It is the partial schematic explanatory drawing which showed the structure which adjusts the force to perform.

  Next, a paper discharge device according to an embodiment of the present invention and an image forming apparatus using such a paper discharge device will be specifically described with reference to the accompanying drawings. Note that the paper discharge device and the image forming apparatus according to the present invention are not limited to those shown in the following embodiments, and can be appropriately changed and implemented without changing the gist thereof.

  In the image forming apparatus 1 of this embodiment, as shown in FIG. 1, a black imaging unit 10K that performs image formation using black toner and an image formation using cyan toner are formed therein. Four imaging units 10K including a cyan imaging unit 10C, a magenta imaging unit 10M that forms an image using magenta toner, and a yellow imaging unit 10Y that forms an image using yellow toner. , 10C, 10M, 10Y.

  In each of the imaging units 10K, 10C, 10M, and 10Y, the photosensitive member 11, the charging device 12 that charges the surface of the photosensitive member 11, and the surface of the charged photosensitive member 11 according to image information. A latent image forming device 13 that performs exposure to form an electrostatic latent image on the surface of the photoreceptor 11 and a developing device that supplies toner to the electrostatic latent image formed on the surface of the photoreceptor 11 to form a toner image. 14 and a first cleaning device 15 that removes toner and other residues remaining on the surface of the photoconductor 11 after a toner image formed on the surface of the photoconductor 11 is transferred to an intermediate transfer belt 21 described later. ing.

  In this image forming apparatus 1, in each of the imaging cartridges 10K, 10C, 10M, and 10Y, the surface of the photoreceptor 11 is charged by the charging device 12, and the surface of each photoreceptor 11 thus charged is charged. The latent image forming device 13 performs exposure according to the image information, forms an electrostatic latent image according to the image information on the surface of each photoconductor 11, and forms the electrostatic image formed on the surface of each photoconductor 11. A toner of each color is supplied from the developing device 14 to the latent image, and a toner image of each color is formed on the surface of each photoconductor 11.

  Next, the intermediate transfer belt 21 is driven to rotate by driving the toner images of the respective colors formed on the surfaces of the photoreceptors 11 in the imaging units 10K, 10C, 10M, and 10Y between the driving roller 22a and the rotating roller 22b. The toner images of the respective colors formed on the surface of each photoconductor 11 are sequentially transferred to the intermediate transfer belt 21 by the primary transfer roller 23 respectively. The toner images of the respective colors are superimposed on the intermediate transfer belt 21. In addition, after the toner image formed on the surface of each photoconductor 11 as described above is primarily transferred to the intermediate transfer belt 21, the residual toner such as toner remaining on the surface of each photoconductor 11 is respectively transferred to the above-described first. 1 is removed by a cleaning device 15.

  As described above, the color toner images superimposed on the intermediate transfer belt 21 are guided to a position facing the secondary transfer roller 24.

  On the other hand, a sheet feeding cassette 2 in which sheets S are stacked and accommodated is provided at the bottom of the image forming apparatus 1, and the sheet S accommodated in the sheet feeding cassette 2 is pushed up by the push-up plate 2a and pushed up. The paper S is pulled out from the paper feed cassette 2 by the pickup roller 25 and guided between the paper feed roller 26a and the separating roller 26b.

  Then, one sheet S is guided between the pair of timing rollers 27 through the sheet feeding roller 26a and the separating roller 26b, and the intermediate transfer belt 21 is conveyed at an appropriate timing by the timing roller 27. And the secondary transfer roller 24, and the toner image formed on the intermediate transfer belt 21 is transferred onto the paper S by the secondary transfer roller 24. It should be noted that the residual toner such as toner remaining on the intermediate transfer belt 21 without being transferred onto the paper S is removed from the intermediate transfer belt 21 by the second cleaning device 28.

  Then, the sheet S on which the toner image is transferred as described above is guided to the fixing device 29, and after the toner image is fixed on the sheet S in the fixing device 29, the sheet S on which the toner image is fixed is A pair of paper discharge rollers 31 in the paper discharge device 30 causes the paper discharge unit 3 to discharge the paper to the paper discharge tray unit 4. The paper S discharged to the paper discharge tray unit 4 is pressed by the swinging pressing member 32.

  Next, an embodiment of the paper discharge device 30 will be described.

(Embodiment 1)
In the paper discharge device 30 according to the first exemplary embodiment, as illustrated in FIGS. 2 and 3, as the pressing member 32, a central pressing member 32 a that presses a central portion in the width direction of the paper S that intersects the paper discharge direction of the paper S; An end pressing member 32b that presses the width direction end of the sheet S on both sides of the central pressing member 32a can be rotated in the vertical direction with a support shaft 32c provided above the paper discharge roller 31 as a rotation fulcrum. At the same time, the lengths of the center pressing member 32a and each end pressing member 32b extending in the paper discharge direction from the support shaft 32c are the same.

  Here, when the center pressing member 32a and the end pressing member 32b are provided so as to be pivotable in the vertical direction with the support shaft 32c as a rotation fulcrum, the center pressing member 32a and the end pressing member 32b are respectively provided. The center presser member 32a is attached so as to rotate together with the support shaft 32c, while the end presser members 32b on both sides are attached to the support shaft 32c. It can also be attached so that it can rotate.

  In the paper discharge device 30, the width of the central pressing member 32a is made larger than the width of the end pressing member 32b on both sides, and weights 32d are attached to the end pressing members 32b on both sides, The pressing force that presses the edge in the width direction of the sheet S by the end pressing member 32b is made stronger than the pressing force that presses the center in the width direction of the sheet S by the center pressing member 32a.

  Here, as shown in FIG. 4A, the paper S discharged from the discharge unit 3 is discharged from the discharge unit 3 in a state where the sheet S curls in a concave shape in the width direction and both ends in the width direction are lifted. As shown in FIG. 4B, both lifted end portions of the sheet S are pressed by the end pressing members 32b on both sides whose pressing force is stronger than that of the center pressing member 32a. The central portion of the sheet S, which is pressed at both ends, is appropriately prevented from being lifted by the wide center pressing member 32a, and the concavely curled sheet S is substantially flat on the discharge tray portion 4. The sheet S is corrected to the state, and is stacked on the discharge tray unit 4 in an appropriate state.

  Further, as shown in FIG. 5A, the sheet S discharged from the discharge unit 3 is discharged from the discharge unit 3 in a state where the sheet S is curled convexly in the width direction and the central portion in the width direction is lifted. 5B, as shown in FIG. 5B, the central portion where the sheet S is lifted is pressed by the wide central pressing member 32a, and both ends of the sheet S where the center portion is pressed are lifted. Is properly prevented by the end pressing member 32b, and the convexly curled paper sheet S is corrected to a substantially flat state on the paper discharge tray section 4 so that the paper sheet S is in an appropriate state. It will be loaded on the part 4.

  In the paper discharge device 30 according to the first embodiment, only one end pressing member 32b is provided on each side of the central pressing member 32a. However, as shown in FIG. 6, A4 size, A5 The end pressing member 32b may be divided into a plurality of pieces in the width direction of the paper S so as to correspond to the width of the paper S of various sizes such as size.

(Embodiment 2)
In the paper discharge device 30 according to the second embodiment, as shown in FIGS. 7 to 9, the pressing member 32 rotates from both ends in the width direction of the sheet S in the center pressing member 32 a that presses the center in the width direction of the sheet S. The shaft 32e is extended to the side, and an end pressing member 32b that presses the end in the width direction of the paper S is attached to each rotating shaft 32e so as to be rotatable in the vertical direction.

  In the paper discharge device 30 as well, the width of the central pressing member 32a is made larger than the width of the end pressing members 32b on both sides thereof, and the width direction end of the sheet S is set by the end pressing members 32b on both sides. The pressing force for pressing the portion is made stronger than the pressing force for pressing the center portion in the width direction of the sheet S by the center pressing member 32a.

  Here, in the paper discharge device 30, the pressing force for pressing the width direction end of the sheet S by the end pressing members 32b on both sides is greater than the pressing force for pressing the width direction center of the sheet S by the center pressing member 32a. In strengthening, as shown in FIGS. 7 and 8, a torsion coil spring 32f is wound around the rotating shaft 32e as an urging member, and one end of the torsion coil spring 32f is provided in the image forming apparatus 1. The other end of the torsion coil spring 32f is locked to the locking portion 32g provided on the end pressing member 32b, and the end pressing member 32b is locked by the torsion coil spring 32f. Energize towards 4.

  In this way, the sheet S is curled concavely in the width direction and both ends in the width direction are lifted, or the sheet S is curled convexly in the width direction and the state in the width direction is raised. Even when the sheet is discharged from the discharge unit 3, the sheet S curled by the center pressing member 32a and the end pressing member 32b is appropriately applied as in the case of the sheet discharging device 30 of the first embodiment. The curled paper S is pressed and corrected to a substantially flat state on the paper discharge tray unit 4, and the paper S is stacked on the paper discharge tray unit 4 in an appropriate state.

  Further, in the paper discharge device 30, as shown in FIG. 9, the paper discharge tray section 4 is connected to one rotary shaft 32e extending laterally from the width direction end of the paper S in the center pressing member 32a. An actuator 33 for detecting the amount of paper S stacked thereon is attached, and a detection sensor 34 for detecting the position of the actuator 33 is provided.

  In the state where the amount of the sheets S stacked on the discharge tray portion 4 is small and the tips of the center pressing member 32a and the end pressing member 32b are rotated downward, FIG. As shown, the actuator 33 is maintained at a position rotated above the detection sensor 34, and the actuator 33 is not detected by the detection sensor 34. On the other hand, when the amount of sheets S stacked on the paper discharge tray 4 increases and the tips of the center pressing member 32a and the end pressing member 32b are rotated upward, the above-mentioned is accompanied by When the amount of sheets S stacked on the sheet discharge tray portion 4 exceeds a predetermined amount as shown in FIG. 10B, the actuator 33 This is detected by the detection sensor 34. When the actuator 33 is detected by the detection sensor 34 as described above, a display device (not shown) or the like indicates that the amount of sheets S stacked on the paper discharge tray unit 4 exceeds a predetermined amount. To be displayed.

  Further, in the paper discharge device 30 according to the second embodiment, the torsion coil spring 32f is used as the urging member as described above in order to increase the pressing force that presses the end in the width direction of the sheet S by the end pressing member 32b. However, the method for increasing the pressing force for pressing the edge in the width direction of the paper S by the end pressing member 32b is not limited to this.

  For example, as shown in FIG. 11, a tension coil spring 32h is used as an urging member, and one end of the tension coil spring 32h is locked to a locking portion 32g provided on the end pressing member 32b. As the adjusting means 35 for adjusting the pressing force by the end pressing member 32b, a locking portion 35c is provided on the arm member 35b rotated by the rotating device 35a, and the other end of the tension coil spring 32h is provided on the locking portion 35c. It can be made to lock.

  In this case, the force of pulling the end pressing member 32b by the tension coil spring 32h is adjusted by rotating the arm member 35b in the direction approaching or moving away from the end pressing member 32b by the rotating device 35a. Thus, it is possible to adjust the pressing force of the end pressing member 32b that presses the end in the width direction of the paper S. As a result, even if the curling state of the paper S changes due to changes in the type of the paper S, environmental conditions, and the like, the pressing force that presses the end in the width direction of the paper S is changed by the end pressing member 32b, and the curling is changed. The corrected sheet S can be properly corrected on the discharge tray unit 4.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus, 1a Locking part 2 Paper feed cassette, 2a Push-up board 3 Discharge part 4 Discharge tray part 10K, 10C, 10M, 10Y Imaging unit 11 Photoconductor 12 Charging apparatus 13 Latent image forming apparatus 14 Developing apparatus 15 1st 1 Cleaning device 21 Intermediate transfer belt 22a Driving roller, 22b Rotating roller 23 Primary transfer roller 24 Secondary transfer roller 25 Pickup roller 26a Paper feed roller, 26b Rolling roller 27 Timing roller 28 Second cleaning device 29 Fixing device 30 Paper discharge device 31 Paper discharge roller 32 Press member, 32a Center press member, 32b End press member, 32c Support shaft, 32d Weight, 32e Rotating shaft, 32f Torsion coil spring (biasing member), 32g Locking portion, 32h Tension coil spring (biasing member) )
33 Actuator 34 Detection sensor 35 Adjustment means, 35a Rotating device, 35b Arm member, 35c Locking portion S Paper

Claims (8)

In a paper discharge device that discharges paper from the discharge portion to the paper discharge tray portion, a presser that makes contact with the paper discharged from the discharge portion and swings up and down to hold the paper discharged to the paper discharge tray portion. As the members, there are provided a center pressing member that presses the central portion in the width direction of the sheet that intersects the paper discharge direction, and end pressing members that respectively press the end portions in the width direction of the paper on both sides of the central pressing member. A paper discharge device characterized in that the pressing force of the end pressing member is made stronger than the pressing force of the central pressing member, and the width of the central pressing member is wider than the width of the end pressing member . In a paper discharge device that discharges paper from the discharge portion to the paper discharge tray portion, a presser that makes contact with the paper discharged from the discharge portion and swings up and down to hold the paper discharged to the paper discharge tray portion. As the members, there are provided a center pressing member that presses the central portion in the width direction of the sheet that intersects the paper discharge direction, and end pressing members that respectively press the end portions in the width direction of the paper on both sides of the central pressing member. The presser force of the end presser member is made stronger than the presser force of the central presser member, and the end presser members provided on both sides of the central presser member are arranged in the width direction of the paper so as to correspond to the width of the paper. A paper discharge device provided by being divided into a plurality of parts . 3. The paper discharge device according to claim 2 , wherein a width of the central pressing member is wider than a width of the end pressing member .   4. The paper discharge device according to claim 1, wherein the central pressing member and the end pressing member are provided so as to be rotatable in the vertical direction around a rotation fulcrum, respectively. The paper discharge device is characterized in that the central pressing member and the end pressing member that extend in the paper discharge direction are the same in length.   5. The paper discharge device according to claim 1, wherein a weight is attached to the end pressing member to make the pressing force of the end pressing member stronger than the pressing force of the center pressing member. A paper discharge device.   5. The sheet discharge device according to claim 1, wherein the end pressing member is biased toward the sheet discharge tray portion by a biasing member, and the pressing force of the end pressing member is determined. A paper discharge device characterized in that is made stronger than the pressing force of the center pressing member.   The paper discharge device according to any one of claims 1 to 6, further comprising an adjusting unit that adjusts a pressing force by the end pressing member.   8. An image forming apparatus that discharges a sheet on which a toner image is formed from a discharge section to a discharge tray section by a discharge apparatus, wherein the discharge apparatus according to any one of claims 1 to 7 is used. An image forming apparatus.

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