JP2010275055A - Paper discharging device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper discharging device and an image forming device, while preventing the occurrence of defective discharging of paper, suppressing curling of the paper on both ends thereof in the width direction of the paper which is discharged into a paper discharging tray via a paper pressing member. <P>SOLUTION: The image forming device includes at least the paper discharging tray, a shifter 10 and the paper pressing member 14. The paper pressing member 14 is swingably supported on the shifter 10 and held in contact with the paper discharged to the paper discharging tray for suppressing curling of the paper on both ends thereof in the width direction of the paper. The paper pressing member 14 includes sheet supporting sections 144 and paper pressing sheets 142. Two paper pressing sheets 142 are attached to the sheet supporting section 144. The paper pressing sheets 142 are located on an engaging portion at both sides thereof, respectively. The paper pressing sheets 142 have cutout portions formed in central portions along the width direction, respectively, at end portions held in contact with the paper discharged to the paper discharging tray. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sheet discharge apparatus and an image forming apparatus provided with a sheet pressing member that suppresses curling at both ends in the width direction of a sheet discharged to a sheet discharge tray.

  In general, an image forming apparatus such as a copying machine, a facsimile machine, or a printer includes a paper discharge device for discharging and carrying a sheet on which an image has been formed onto a paper discharge tray. In many cases, such a paper discharge device is provided with a full detection sensor for detecting the fullness of the paper on the paper discharge tray. This full detection sensor detects that the paper on the paper output tray is full, eliminating the problem of continuing to discharge subsequent papers even though the paper on the paper output tray is full. As a result, the occurrence of problems associated with the discharge of paper in the paper discharge device has been resolved.

  However, the paper on the paper discharge tray does not always maintain a flat state, and sometimes both ends in the paper width direction orthogonal to the paper transport direction and the rear end of the paper are curved upward. . For example, a sheet of recording paper or the like sent out from the fixing device may be in a curled state in which both end portions in the paper width direction are curved upward due to a heating action at the time of fixing.

  Therefore, in the prior art, an elastic paper pressing guide is provided, and the paper on the paper discharge tray is pressed from above by the elasticity of the paper pressing guide, so that the paper on the paper discharge tray is curled by the discharge port. There is one configured to prevent blocking (see, for example, Patent Document 1).

JP-A-10-29354

  However, when the paper pressing guide shown in the above-mentioned Patent Document 1 is used, a paper discharge failure may occur due to friction between the paper discharged to the paper discharge tray and the paper pressing guide. For example, the paper is pulled back toward the paper discharge port due to the friction between the paper pressing guide and the paper, and as a result, a paper jam may occur at the paper discharge port.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a paper discharge device and an image capable of suppressing curling at both ends in the width direction of paper discharged to a paper discharge tray via a paper pressing member while preventing occurrence of paper discharge failure. A forming apparatus is provided.

  The paper discharge device according to the present invention includes at least a paper discharge tray, a shifter, and a paper pressing member. The paper discharge tray is configured to discharge paper that has undergone predetermined processing. The shifter is supported so as to be capable of reciprocating in the width direction perpendicular to the paper transport direction above the paper discharge tray. The sheet pressing member is swingably supported by the shifter and configured to suppress curling at both ends in the width direction of the sheet by contacting the sheet discharged to the sheet discharge tray.

  The sheet pressing member includes a sheet support portion and a sheet pressing sheet. The sheet support part is configured to be swingably supported by the shifter via an engagement part disposed at the center part, and is configured to extend from the engagement part to both sides in the width direction. Two sheet pressing sheets are attached to the sheet support section. These sheet pressing sheets are respectively arranged on both sides of the engaging portion. Each sheet pressing sheet has a notch at the center in the width direction at the end contacting the sheet discharged to the sheet discharge tray.

  In this configuration, the contact area between the paper pressing sheet and the paper is reduced by the notch provided in the center in the width direction of the paper pressing sheet, so that the friction between the paper pressing sheet and the paper becomes excessively large. Is prevented.

  On the other hand, the notches are provided only at the center in the width direction of the sheet pressing sheet, and the sheet pressing sheets are provided on both the left and right sides of the sheet support section. The function of suppressing curling does not deteriorate. In addition, since the notch is provided only at the center in the width direction of the sheet pressing sheet, when the shifter moves, the notch is physically positioned between the sheet on the paper discharge tray and the notch of the sheet pressing sheet. Interference is unlikely to occur.

  According to the present invention, it is possible to suppress curling at both ends in the width direction of the paper discharged to the paper discharge tray via the paper pressing member while preventing the occurrence of defective paper discharge.

  FIG. 1 is a diagram schematically illustrating an image forming apparatus 50 according to an embodiment of the present invention. The image forming apparatus 50 forms multicolor and single color images on a predetermined sheet (recording sheet) according to image data transmitted from the outside, and includes an image forming unit 82 and a document reading unit 58. ing.

  The image forming unit 82 includes an optical scanning device 88, a developing device 91, a photosensitive drum 90, a cleaner unit 93, a charger 92, an intermediate transfer belt unit 95, a fixing unit 74, a paper feed cassette 71, a paper discharge tray 80, and the like. Configured.

  A document placing table 54 made of transparent glass on which a document is placed is provided above the image forming unit 82, and an automatic document processing device 56 is attached to the upper side of the document placing table 54. The automatic document processing device 56 automatically conveys the document on the document table 54. The automatic document processor 56 is configured to be rotatable in the direction of the arrow 52, and the document can be placed manually by opening the document table 54.

  The image data handled in this image forming apparatus corresponds to a color image using each color of black (K), cyan (C), magenta (M), and yellow (Y). Accordingly, four developing units 91, photosensitive drums 90, charging units 92, and cleaner units 93 are provided so as to form four types of latent images corresponding to the respective colors. Black, cyan, magenta, and yellow are respectively provided. These are set to form four image stations.

  The charger 92 is a charging means for uniformly charging the surface of the photosensitive drum 90 to a predetermined potential. In addition to the charger type as shown in FIG. 1, a contact type roller type or brush type charger is used. Sometimes used.

  The optical scanning device 88 is configured to form an electrostatic latent image on the surface of the photosensitive drum 90 based on the input image data. Details of the optical scanning device 88 will be described later.

  The developing device 91 visualizes the electrostatic latent images formed on the respective photosensitive drums 90 with toner of four colors (YMCK). The cleaner unit 93 removes and collects toner remaining on the surface of the photosensitive drum 90 after development and image transfer.

  The intermediate transfer belt unit 95 disposed above the photosensitive drum 90 includes an intermediate transfer belt 94, an intermediate transfer belt driving roller 85, an intermediate transfer belt driven roller 84, an intermediate transfer roller 96, and an intermediate transfer belt cleaning unit 86. I have. Four intermediate transfer rollers 96 are provided corresponding to each color for YMCK.

  The intermediate transfer belt drive roller 85, the intermediate transfer belt driven roller 84, and the intermediate transfer roller 96 are driven to rotate by stretching the intermediate transfer belt 94. Each intermediate transfer roller 96 provides a transfer bias for transferring the toner image on the photosensitive drum 90 onto the intermediate transfer belt 94.

  The intermediate transfer belt 94 is provided so as to come into contact with the respective photosensitive drums 90, and the toner images of the respective colors formed on the photosensitive drums 90 are sequentially superimposed and transferred onto the intermediate transfer belt 94. Further, it has a function of forming a color toner image (multicolor toner image) on the intermediate transfer belt 94. The intermediate transfer belt 94 is formed in an endless shape using, for example, a film having a thickness of about 100 μm to 150 μm.

  The transfer of the toner image from the photosensitive drum 90 to the intermediate transfer belt 94 is performed by an intermediate transfer roller 96 that is in contact with the back side of the intermediate transfer belt 94. A high voltage transfer bias (a high voltage having a polarity (+) opposite to the toner charging polarity (−)) is applied to the intermediate transfer roller 96 in order to transfer the toner image. The intermediate transfer roller 96 is a roller whose base is a metal (for example, stainless steel) shaft having a diameter of 8 to 10 mm and whose surface is covered with a conductive elastic material (for example, EPDM, urethane foam, or the like). By this conductive elastic material, a high voltage can be uniformly applied to the intermediate transfer belt 94. In this embodiment, a roller shape is used as the transfer electrode, but a brush or the like can also be used.

  As described above, the electrostatic images visualized according to the respective hues on the respective photosensitive drums 90 are laminated on the intermediate transfer belt 94. As described above, the laminated image information is transferred onto the sheet by the transfer roller 87 disposed at a contact position between the sheet and the intermediate transfer belt 94, which will be described later, by the rotation of the intermediate transfer belt 94.

  At this time, the intermediate transfer belt 94 and the transfer roller 87 are pressed against each other at a predetermined nip, and a voltage for transferring the toner onto the paper is applied to the transfer roller 87 (the polarity opposite to the toner charging polarity (−)). (+) High voltage). Further, in order to obtain the nip constantly, the transfer roller 87 uses either the transfer roller 87 or the intermediate transfer belt drive roller 85 as a hard material (metal or the like) and the other as a soft material (elasticity such as an elastic roller). A rubber roller, a foaming resin roller, or the like) is used.

  Further, as described above, the toner attached to the intermediate transfer belt 94 by contacting the photosensitive drum 90 or the toner remaining on the intermediate transfer belt 94 without being transferred onto the sheet by the transfer roller 87 is used in the next step. Therefore, the intermediate transfer belt cleaning unit 86 is set so as to be removed and collected. The intermediate transfer belt cleaning unit 86 includes a cleaning blade as a cleaning member that contacts the intermediate transfer belt 94, for example, and the intermediate transfer belt 94 that contacts the cleaning blade is supported by an intermediate transfer belt driven roller 84 from the back side. ing.

  The paper feed cassette 71 is a tray for storing paper (recording paper) used for image formation, and is provided below the optical scanning device 88 of the image forming unit 82. Further, paper used for image formation can also be placed in the manual paper feed cassette 78. A paper discharge tray 80 provided above the image forming unit 82 is a tray for collecting printed sheets face down.

  Further, the image forming unit 82 has a substantially vertical sheet conveyance path 77 for sending the sheets of the sheet feeding cassette 71 and the manual sheet feeding cassette 78 to the sheet discharge tray 80 via the transfer roller 87 and the fixing unit 74. Is provided. Pickup rollers 73 and 75, a plurality of transport rollers 62, 64, 66 and 68, a registration roller 79, and a transfer roller are located in the vicinity of a paper transport path 77 from the paper feed cassette 71 or the manual paper feed cassette 78 to the paper discharge tray 80. 87, a fixing unit 74, and the like are arranged.

  The transport rollers 62, 64, 66 and 68 are small rollers for promoting and assisting the transport of paper, and a plurality of the transport rollers 62, 64, 66 and 68 are provided along the paper transport path 77. The pickup roller 73 is provided near the end of the paper feed cassette 71, picks up paper one by one from the paper feed cassette 71, and supplies it to the paper transport path 77. Similarly, the pickup roller 75 is provided near the end of the manual paper feed cassette 78, picks up paper one by one from the manual paper feed cassette 78, and supplies it to the paper transport path 77.

  The registration roller 79 temporarily holds the paper that is being conveyed through the paper conveyance path 77. The sheet has a function of conveying the sheet to the transfer roller 87 at the timing when the leading edge of the toner image on the photosensitive drum 90 is aligned with the leading edge of the sheet.

  The fixing unit 74 includes a heat roller 72 and a pressure roller 76, and the heat roller 72 and the pressure roller 76 are configured to rotate with a sheet interposed therebetween. The heat roller 72 is set so as to reach a predetermined fixing temperature by the control unit based on a signal from a temperature detector (not shown). It has the function of fusing, mixing, and pressing the transferred multicolor toner image and thermally fixing it to the paper. An external heating belt 70 for heating the heat roller 72 from the outside is provided.

    Next, the paper conveyance path will be described in detail. As described above, the image forming apparatus is provided with the paper feed cassette 71 for storing paper and the manual paper feed cassette 78 in advance. Pickup rollers 73 and 75 are arranged to feed paper from the paper feed cassettes 71 and 78, respectively, and guide the paper one by one to the conveyance path 77.

  The sheet conveyed from each of the sheet feeding cassettes 71 and 78 is conveyed to the registration roller 79 by the conveying roller 62 of the sheet conveying path 77, and the transfer roller is aligned with the timing of aligning the leading edge of the sheet and the leading edge of the image information on the intermediate transfer belt 94. The image information is written on the paper. Thereafter, the sheet passes through the fixing unit 74, whereby the unfixed toner on the sheet is melted and fixed by heat, and is discharged onto the sheet discharge tray 80 through the conveyance roller 68 disposed thereafter.

  The above transport path is for a request for single-sided printing on a sheet. On the other hand, for a request for double-sided printing, the trailing edge of the sheet that has passed single-sided printing and has passed through the fixing unit 74 as described above. When gripped by the final transport roller 68, the transport roller 68 rotates backward to guide the paper to the transport rollers 66 and 64. Then, after printing is performed on the back side of the sheet through the registration roller 79, the sheet is discharged to the discharge tray 80.

  A shifter 10 is provided at a paper discharge port near the paper discharge tray 80. For example, when the sheets are continuously discharged to the discharge tray 80, the shifter 10 selectively offsets the sheets. As shown in FIG. 2, the shifter 10 is supported by one of the units forming the image forming apparatus 50 so as to be reciprocally movable in the paper width direction (see arrow 100 in FIG. 2) perpendicular to the paper transport direction. Has been.

  Next, a schematic configuration of the shifter 10 will be described with reference to FIGS. 3 (A) to 3 (D). As shown in the figure, the shifter 10 includes a main body 11 that can slide on a moving shaft 12 arranged along the paper width direction. The main body 11 supports the sheet pressing member 14 so as to be swingable, and also supports an actuator 16 of a fullness detection sensor for detecting the fullness of the sheets stacked on the paper discharge tray 80 so as to be swingable. .

  As shown in FIGS. 4A and 4B, the sheet pressing member 14 is supported by the sheet support portion 144 and the sheet support portion 144 that are supported slidably on the main body 11 via the engagement piece 145. Two sheet pressing sheets 142 are fixed to each other.

  The sheet pressing member 14 presses both ends in the sheet width direction of the sheet discharged to the sheet discharge tray 80 from the upper surface side via the two sheet pressing sheets 142, thereby discharging the sheet discharged to the sheet discharge tray 80. Has a function of correcting curvature in the paper width direction.

  The sheet pressing sheet 142 is made of a flexible member, and is fixed to the left and right sides of the sheet support portion 144 via double-sided tape. In this embodiment, polycarbonate is adopted as the material of the sheet support portion 144, and PET is adopted as the material of the sheet pressing sheet 142. However, the material of the sheet supporting unit 144 and the sheet pressing sheet 142 and the method for fixing the sheet pressing sheet 142 to the sheet supporting unit 144 are not limited to these.

  As shown in FIG. 4B, the sheet pressing sheet 142 is configured to be slightly curved so as to be convex toward the side in which the sheet abuts (see arrow 200 in the figure). However, since the above-described curve of the sheet pressing sheet 142 is not an essential requirement, a flat sheet pressing sheet 142 that is not curved can be used.

  By applying a downward force to the paper discharged to the paper discharge tray 80 while the paper pressing sheet 142 slides, the curvature formed on both sides in the paper width direction is corrected. Specifically, when the trailing edge of the sheet is removed from the conveying roller 68, the sheet falls downward while being pressed by the sheet pressing sheet 142.

  Here, in the conventional sheet pressing sheet, there is a case where a sheet discharge failure occurs due to friction between the sheet pressing sheet 142 and the sheet. For example, as shown in FIG. 5, the paper is pulled back to the paper discharge port side by friction between the paper pressing sheet 142 and the paper, and as a result, a paper jam may occur at the paper discharge port.

  Therefore, in this embodiment, a notch 146 is provided at the center of each sheet pressing sheet 142 to reduce the contact range between the sheet pressing sheet 142 and the sheet, thereby causing excessive friction between the sheet pressing sheet 142 and the sheet. Preventing it from growing. The cutout portion 146 has an inclined end portion 147 that is inclined so as to move away from the sheet as it approaches the center. The inclined end portion 147 is configured to be bilaterally symmetric with respect to the center of the sheet pressing sheet 142.

  Further, the notched portion 146 is configured such that the inclined end portion 147 is gently inclined so that the amount of the notch does not become larger than necessary. The reason is that as the notch amount of the notch portion 146 increases, the weight of the sheet pressing sheet 142 decreases, and as a result, the force for pressing the end of the sheet in the width direction is weakened, and the ability to suppress curling may decrease. Because. In addition, when the inclination of the inclined end portion 147 is large, the inclination angle of the inclined end portion 147 is increased, so that the sheet that contacts the inclined end portion 147 may be caught when the shifter 10 moves. is there. Actually, the inclination angle of the inclined end portion 147 may be set to about 3 to 10 degrees, more preferably about 5 to 7 degrees.

  As a result of providing the notch portion 146 as described above, each sheet pressing sheet 142 is provided with a symmetrically inclined end portion 147 at the center portion, and linear straight end portions 148 on both sides thereof. It will be. Further, the distance between the linear end 148 of the right sheet pressing sheet 142 and the linear end 148 of the left sheet pressing sheet 142 is the width of the minimum size sheet (for example, postcard) that can be printed by the image forming apparatus 50. It is comprised so that it may become smaller. The reason is to prevent small size paper from being caught between the straight end 148 of the right sheet pressing sheet and the straight end 148 of the left sheet pressing sheet when the shifter 10 is moved. .

  When a plurality of sheet pressing sheets 142 (two sheets in this embodiment) are attached to the sheet support portion 144, the outer edge of the portion of the sheet pressing sheet 142 that comes into contact with the sheet becomes wavy. Further, each sheet pressing sheet 142 is provided with a rounded portion 149 outside each linear end portion 148. By forming the rounded portion 149, the sheet pressing sheet 142 is more difficult to be caught on the sheet when the shifter 10 moves.

  Next, a schematic configuration of the actuator 16 will be described with reference to FIGS. 6 (A) to 6 (C). The actuator 16 is swingably supported by the main body 11 of the shifter 10 via a support portion 168 provided at one end of the arm portion 16. A triangular plate-like member 165 is attached to the other end side of the arm portion 16, and a fullness detection portion 164 in which the vicinity of the apex of the plate-like member 165 contacts the uppermost sheet on the paper discharge tray 80 is provided. Constitute. A curled paper detection unit 162 is provided along one side of the plate member 165. Furthermore, as shown in FIG. 6C, the actuator 16 has a shape that tapers from the support portion 168 toward the full detection portion 164. The reason for adopting such a shape is to avoid the fact that the weight of the actuator 16 becomes heavier than in the prior art by arranging the plate-like member 165 for forming the curled paper detection unit 162.

  Subsequently, the operation of the actuator 16 will be briefly described with reference to FIGS. 7 (A) to 7 (C). 7A to 7C, the virtual line 310 indicates the position of the full detection unit 164 of the actuator 16 arranged at the standby position, and the virtual line 320 indicates the actuator arranged at the full detection position. The positions of 16 full detection units 164 are shown.

  As shown in FIG. 7A, when the uppermost sheet 300 stacked on the sheet discharge tray 80 is below the position indicated by the imaginary line 310, the actuator 16 is lifted to one end of the sheet when the sheet is discharged. After that, it returns to the standby position.

  When the uppermost sheet 300 stacked on the paper discharge tray 80 reaches the position indicated by the imaginary line 310, the actuator 16 is lifted upward by the uppermost sheet 300. At this time, the actuator is displaced upward as the number of sheets on the sheet discharge tray 80 increases. Then, as shown in FIG. 7B, when the uppermost sheet 300 reaches the position indicated by the virtual line 320, the actuator 16 reaches the full detection position. The position of the actuator 16 is detected by the photosensor 15. When the actuator 16 reaches the full detection position, the photo sensor 15 is shielded from light by the light shielding portion and outputs a signal. When the actuator 16 continues to be positioned at the full detection position for a predetermined time or longer, that is, when a signal is continuously output from the photosensor 15, the control unit of the image forming apparatus 50 causes the sheet on the paper discharge tray 80 to be discharged. Detect when it is full. And this detection result is notified to a user via a display part etc.

  Further, as shown in FIG. 7C, when the curled paper detection unit 162 is provided, if the rear end of the paper is curled upward, the uppermost paper is positioned at the position indicated by the virtual line 320. The actuator 16 is lifted up to the full detection position even if it has not reached. For this reason, when the trailing edge curl is generated in the paper stacked on the paper discharge tray 80, the trailing edge of the paper is caught in the roller (here, the conveyance roller 68) disposed in the discharge port. Occurrence of a problem that paper jam occurs is prevented.

  The curled paper detection unit 162 is formed so as to be inclined with respect to the paper placement surface so as to move away from the paper placement surface of the paper discharge tray 80 as it proceeds in the direction opposite to the paper transport direction. As the inclination angle of the curled paper detection unit 162 approaches parallel to the paper placement surface of the paper discharge tray 80, the actuator 16 can be lifted via the curled paper detection unit 162 even by a smaller curl. For this reason, it is preferable to set an inclination angle of the curled paper detection unit 162 with respect to the paper placement surface in accordance with how much curl is allowed.

  For example, in this embodiment, when a sheet having a curled trailing edge is arranged on the sheet discharge tray 80, the curl is detected so that about 100 sheets are fully filled as compared with the case where a conventional actuator is used. The shape of the paper detection unit 162 and the arrangement of the actuators 16 are designed. Actually, the curled paper detection unit 162 is preferably inclined by about 1 to 15 degrees with respect to the paper placement surface of the paper discharge tray 80.

  In addition, since the actuator 16 is swingably supported by the main body 11 of the shifter 10, the curled paper detection unit 162 approaches the parallel surface of the paper discharge tray as the number of sheets stacked approaches. Therefore, the curl tolerance is large when the number of sheets is small, while the curl tolerance is small when the number of sheets is large. For this reason, when the number of sheets is almost full, full detection is performed even if the trailing edge of the sheet is curled upward.

  According to the embodiment described above, it is possible to prevent the occurrence of a problem that a paper jam occurs due to the paper loaded on the paper discharge tray 80 and curled at the rear end being bitten by the paper discharge roller. In addition, it is possible to prevent the occurrence of paper discharge failure of the discharged paper due to the friction between the paper pressing sheet 142 and the paper. Furthermore, by using only one actuator 16, both the full state and the curl state of the paper on the paper discharge tray 80 can be easily detected. In particular, by replacing the actuator 16 with the actuator 16, it is possible to detect both the full state and the curl state of the paper on the paper discharge tray 80, so that the configuration to be newly added can be minimized. It becomes possible.

  The above description of the embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1 is a diagram illustrating a schematic configuration of an image forming apparatus according to an embodiment of the present invention. It is a figure which shows schematic structure of a shifter. It is a figure which shows schematic structure of a shifter. It is a figure which shows the structure of a paper pressing member. It is a figure explaining the subject of the conventional paper pressing member. It is a figure which shows the structure of an actuator. It is a figure explaining the relationship between the state of loaded paper and an actuator.

10-shifter 11-main body 12-shaft 14-sheet pressing member 16-actuator 50-image forming apparatus 142-sheet pressing sheet 144-sheet support section 146-notch section

Claims (5)

A paper discharge tray configured to discharge paper that has undergone predetermined processing;
A shifter supported so as to be capable of reciprocating in the width direction perpendicular to the paper transport direction above the paper discharge tray;
A sheet pressing member configured to be swingably supported by the shifter and configured to suppress curling at both ends in the width direction of the sheet by contacting the sheet discharged to the sheet discharge tray;
With
The paper pressing member is
A seat support portion that is swingably supported by the shifter via an engagement portion disposed at a central portion, and is configured to extend from the engagement portion to both sides in the width direction;
Two sheet pressing sheets attached to the sheet support part, each including a sheet pressing sheet disposed on both sides of the engaging part,
Each of the sheet pressing sheets is a sheet discharging apparatus in which a notch portion is formed at a central portion in the width direction at an end portion contacting the sheet discharged to the sheet discharge tray.   The paper discharge device according to claim 1, wherein the notch portion of the paper pressing sheet has an inclined end portion that is gently inclined so as to move away from the paper as it approaches the center.   3. The sheet pressing sheet has a straight linear end portion that abuts on a sheet discharged to the sheet discharge tray on both sides of the cutout portion, and is configured to be symmetrical as a whole. The paper discharge device described in 1.   The paper discharge device according to claim 1, wherein the sheet support portion is made of polycarbonate, and the paper pressing sheet is made of PET.   An image forming apparatus comprising the paper discharge device according to claim 1.

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