JP2012201483A - Sheet ejection device, and image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both a sheet ejection device which can convey a sheet under a situation where the width direction cross section of a sheet is deformed in a waveform and an image formation device which can eject a sheet from a sheet ejection member towards a sheet ejection board under a situation where the width direction cross section of the sheet crossing a sheet conveyance direction is deformed in a waveform.SOLUTION: The sheet ejection device includes a plurality of first rolls prepared at separate positions far from a common axis of rotation to bear sheet ejection and a plurality of second rolls respectively corresponding to the plurality of first rolls and contacting the corresponding first rolls to bear sheet ejection together with the first rolls by pinching the sheet between the second and first rolls, wherein adjacent ones of the plurality of second rolls tilt to reverse directions mutually to have the axes of rotation crossing those of the first rolls.

Description

  The present invention relates to a paper discharge device and an image forming apparatus.

  The recording medium that has been subjected to the fixing process is in a direction that lies on a plane parallel to one surface of the recording medium while passing between the pair of paper discharge rotators, and is also in the recording medium main conveyance direction that is also the conveyance direction of the lower rotator. On the other hand, there is disclosed a technique for suppressing adhesion of the surface of the upper rotating body of the semi-molten developer on the recording medium by applying a conveying force in a direction inclined at a certain angle from at least the upper rotating body (for example, Patent Document 1). reference.).

  In addition, while the recording medium is passing between the pair of rotating bodies, the recording medium is in a direction parallel to one surface of the recording medium and is a constant angle with respect to the recording medium main transport direction which is also the transport direction of the lower rotating body. The conveying force in the inclined direction is applied to the recording medium from the upper rotator, and the pressing force by the elastic member acting on one end side and the other end side of the upper rotator is applied to the one end side and the other end side. Therefore, a technique is disclosed in which one end portion side of the upper rotator is prevented from rising relative to the lower rotator (see, for example, Patent Document 2).

JP 11-311893 A JP 2006-103871 A

  The present invention relates to a paper discharge device capable of transporting paper in a state in which the cross section in the width direction of the paper is deformed into a waveform, and paper discharge in a state in which the cross section in the width direction of the paper intersecting the paper transport direction is deformed into a waveform. An object of the present invention is to provide an image forming apparatus capable of discharging a sheet from a member toward a sheet discharge table.

The paper discharge device according to claim 1 comprises:
A plurality of first rolls that are provided at positions separated from each other on a common rotating shaft;
Corresponding to each of the plurality of first rolls, having a plurality of second rolls in contact with the corresponding first roll and sandwiching the paper between the first roll and responsible for discharging the paper together with the first roll,
The plurality of second rolls are rolls having a rotation axis that intersects with the rotation axis of the first roll so that adjacent second rolls are inclined in opposite directions.

  The sheet discharge device according to claim 2, wherein the second roll is in contact with an end of the second roll that is closer to the rotation axis of the first roll, of both ends in the rotation axis direction. It protrudes from the edge part of the side corresponding to the edge part.

  The sheet discharge device according to claim 3, when the end of the second roll on the side close to the rotation axis of the first roll of both ends in the rotation axis direction is viewed in the rotation axis direction. It exists in the position which overlapped with the edge part of the side corresponding to the edge part of the said 1st roll which the 2nd roll contact | connects.

  According to a fourth aspect of the present invention, at least one end of the second roll that is closer to the rotation axis of the first roll is the first roll of the second roll. It is characterized by being formed with a larger diameter than the portion in contact with the roll.

The image forming apparatus according to claim 5
An image forming unit for forming an image on paper;
A sheet conveying member that conveys a sheet on a sheet conveying path passing through the image forming unit;
A paper discharge tray on which the paper on which the image is formed and discharged is placed;
A paper discharge member for discharging the paper on which the image is formed onto the paper discharge table,
The paper discharge member is
A plurality of first rolls that are provided at positions separated from each other on a common rotating shaft;
Corresponding to each of the plurality of first rolls, having a plurality of second rolls in contact with the corresponding first roll and sandwiching the paper between the first roll and responsible for discharging the paper together with the first roll,
The plurality of second rolls are rolls having a rotation axis that intersects with the rotation axis of the first roll so that adjacent second rolls are inclined in opposite directions.

  According to the paper discharge device of the first aspect, the paper can be transported in a state where the cross section in the width direction of the paper intersecting the paper transport direction is deformed into a waveform.

  According to the paper discharge device of the second aspect, the end portion on the side close to the rotation axis of the first roll is more than the end portion on the side corresponding to the end portion of the first roll with which the second roll is in contact. Compared to the case where the sheet does not protrude, the sheet can be conveyed stably.

  According to the paper discharge device of the third aspect, the end portion on the side close to the rotation axis of the first roll corresponds to the end portion of the first roll contacting the second roll when viewed in the rotation axis direction. Compared to the case where the sheet does not overlap with the side end, the sheet can be conveyed stably.

  According to the paper discharge device of claim 4, at least an end portion of the second roll that is close to the rotation axis of the first roll among the both ends in the rotation axis direction of the second roll is the first roll. Compared to the case where the diameter is not larger than the portion in contact with the sheet, the sheet can be conveyed stably.

  According to the image forming apparatus of the fifth aspect, it is possible to discharge the sheet from the sheet discharge member toward the sheet discharge table in a state where the cross section in the width direction of the sheet intersecting with the sheet conveyance direction is deformed into a waveform.

1 is a schematic configuration diagram showing an embodiment of an image forming apparatus of the present invention. FIG. 6 is a perspective view of the fixing unit as viewed from the sheet discharge stand side. FIG. 3 is a longitudinal sectional view of the fixing unit shown in FIG. FIG. 4 is a front view of the paper discharge member shown in FIGS. 2 and 3. FIG. 3 is a perspective view of the fixing unit as viewed from above.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a schematic configuration diagram showing an embodiment of an image forming apparatus of the present invention.

  An image forming apparatus 1 shown in FIG. 1 forms an electrostatic latent image, develops it with toner, forms a toner image, and finally transfers and fixes the toner image on a sheet, thereby fixing toner on the sheet. An apparatus for forming an image composed of an image. The image forming apparatus 1 is an apparatus that supports not only paper, that is, a paper recording medium, but also a resin recording medium typified by an OHP sheet. However, in the following description, paper is used unless otherwise specified. It is assumed that the recording medium is described as a representative.

  The image forming apparatus 1 according to the present embodiment is a tandem color printer in which four toner image forming units 10Y, 10M, 10C, and 10K that are responsible for image formation of different colors are arranged in parallel. Further, the image forming apparatus 1 generates a single color image in accordance with image data output from a personal computer 2 or an image capturing device (not shown), or image data sent via a telephone line or a LAN (not shown). In addition to the function of printing, it also has a function of printing a full-color image composed of a plurality of color toner images in accordance with such image data.

  As shown in FIG. 1, the image forming apparatus 1 performs shading correction, positional deviation correction, brightness / color space on image data sent from a personal computer 2 or an image reading device (not shown) as necessary. An image processing unit 3 that performs predetermined image processing such as conversion, gamma correction, frame deletion, color / movement editing, and the like, and a control unit 4 that controls the operation of the entire image forming apparatus 1 are provided.

  The four toner image forming units 10Y, 10M, 10C, and 10K provided in the image forming apparatus 1 correspond to yellow (Y), magenta (M), cyan (C), and black (K), respectively. . Since the four toner image forming units 10Y, 10M, 10C, and 10K have the same configuration, the toner image forming unit 10K corresponding to black (K) will be described as a representative example.

  As shown in FIG. 1, the toner image forming unit 10 </ b> K is subjected to image processing that is supplied from the outside and the image processing unit 3 that is supplied from the outside, and a charger 12 that charges the surface of the photoconductor 11. An exposure device 13 composed of an LED print head that irradiates the photoconductor 11 with exposure light based on image data, a developing device 14 that develops the surface of the photoconductor 11 with toner, and a primary transfer that transfers a toner image onto the intermediate transfer belt 20. And a cleaning blade 16 that cleans residual toner remaining on the photoconductor 11 without being transferred onto the intermediate transfer belt 20 by the primary transfer device 15.

  The photoreceptor 11 has a cylindrical surface and rotates in the direction of arrow A about the axis of the cylinder.

  The charger 12 is a roll-like charger in which a conductive layer whose electric resistance is adjusted is coated on the surface of a core metal, and a predetermined charging bias is applied to the core metal.

  The exposure device 13 includes an LED light emitting element array in which LED light emitting elements are arranged linearly along the axial direction of the photosensitive member 11 at a predetermined pitch (for example, 600 dpi to 1200 dpi), and each LED of the LED light emitting element array. A rod lens array that images light emitted from the light emitting element in a spot shape on the photoreceptor 11 is provided.

  The developing device 14 employs a two-component developing method, and contains a two-component developer composed of a magnetic carrier and toner. The developing unit 14 is provided with a developing roll 141.

  Further, as shown in FIG. 1, the image forming apparatus 1 includes an intermediate transfer belt 20 to which a toner image is transferred from the photoreceptor 11 of the toner image forming units 10Y, 10M, 10C, and 10K, and a toner image from the intermediate transfer belt 20. A secondary transfer device 30 that transfers toner onto the paper, a belt cleaning device 23 that cleans residual toner remaining on the intermediate transfer belt 20 without being transferred onto the paper by the secondary transfer device 30, and an unfixed toner image A fixing device 40 for fixing the paper onto the paper, a paper transport unit 50 for transporting the paper along the paper transport path R1, a paper container 60 for storing the paper, and a discharge for placing the paper on which the image has been formed and discharged. A paper base 70 and a paper discharge member 80 for discharging the paper on which the image is formed onto the paper discharge base 70 are provided. In this embodiment, the fixing device 40 and the paper discharge member 80 are provided in an independent fixing unit 90, and the fixing unit 90 is configured to be detachable from the image forming apparatus 1.

  Here, the combination of the toner image forming portions 10Y, 10M, 10C, and 10K, the intermediate transfer belt 20, the secondary transfer device 30, and the fixing device 40 provided in the fixing unit 90 constitutes the image forming portion referred to in the present invention. It corresponds to an example. Further, the paper discharge table 70 corresponds to an example of the paper discharge table in the present invention. Further, the paper discharge member 80 provided in the fixing unit 90 corresponds to an embodiment of the paper discharge device of the present invention and also corresponds to an example of the paper discharge member according to the present invention. A detailed description of the paper discharge member 80 will be described later.

  The intermediate transfer belt 20 is an endless belt-like member supported by the driving roll 21 and the driven roll 22, and an arrow B passing through the toner image forming units 10Y, 10M, 10C, and 10K and the secondary transfer unit 30 in this order. Move around in the direction.

  As shown in FIG. 1, the four toner image forming units 10Y, 10M, 10C, and 10K and the intermediate transfer belt 20 are provided to be inclined in the same direction with respect to the image forming apparatus 1. As a result, the image forming apparatus 1 can be downsized as compared with the case where the four toner image forming units 10Y, 10M, 10C, and 10K and the intermediate transfer belt 20 are provided horizontally.

  The fixing device 40 includes a fixing roll 41 having a heating mechanism 411 and a pressure roll 42 provided to face the fixing roll 41.

  The paper transport unit 50 transports the paper along the paper transport path R1. More specifically, the paper transport unit 50 includes a paper feed roll 51 and a paper separation roll 52 that take out paper one by one from the paper container 60 and a timing at which the secondary transfer device 30 transfers the toner image. And a registration roll 53 for feeding the sheet to the secondary transfer unit 30. The paper transport unit 50 also includes a transport roll that transports the paper disposed along the paper transport path R1, but is not illustrated here. Then, the paper transport unit 50 transports the paper from the paper container 60 along the paper transport path R1 passing through the secondary transfer device 30 and the fixing device 40 in order. The paper transport unit 50 corresponds to an example of a paper transport member according to the present invention.

  The basic operation of the image forming apparatus 1 shown in FIG. 1 will be described below. As a representative, the toner image forming unit 10K corresponding to black (K) will be described.

  The photoreceptor 11 is rotationally driven in the direction of arrow A, and a charge is applied to the surface of the photoreceptor 11 by the charger 12. The exposure device 13 forms an electrostatic latent image by irradiating the photoconductor 11 with exposure light based on image data supplied from the outside and subjected to predetermined image processing by the image processing unit 3. More specifically, the exposure device 13 corresponding to black (K) irradiates the exposure light according to the data corresponding to black (K) in the image data, so that an electrostatic latent image is formed on the surface of the photoreceptor 11. Form. The developing device 14 develops the electrostatic latent image with black (K) toner to form a toner image. More specifically, the toner is charged by stirring in the developing device 14, and the toner is electrically attached to the electrostatic latent image formed by the charger 12 and the exposure device 13 via the developing roll 141. Thus, a toner image drawn with toner is formed. The photoconductor 11 receives the formation of the toner image and holds the toner image. The toner image formed on the surface of the photoreceptor 11 is transferred to the intermediate transfer belt 20 by the primary transfer unit 15. After the toner image formed on the surface of the photoconductor 11 is transferred to the intermediate transfer belt 20, the residual toner remaining on the photoconductor 11 is cleaned by the cleaning blade 16.

  The three toner image forming units 10Y, 10M, 10C, and 10K corresponding to colors other than black (K) also receive toner images corresponding to the respective colors in the same manner as the toner image forming unit 10K corresponding to black (K). Form. The intermediate transfer belt 20 is supported by the drive roll 21 and the driven roll 22 and moves around in the direction of arrow B. The toner image forming units 10Y, 10M, 10C, and 10K are transferred to the intermediate transfer belt 20 with toners of the respective colors. The image is superimposed and transferred. A toner image corresponding to the image data is thus formed on the intermediate transfer belt 20 and moves while holding the toner image.

  On the other hand, the sheets in the sheet container 60 are taken out one by one by the sheet feeding roll 51 and the sheet separating roll 52, and are moved to the sheet conveying path R1 by a conveying roll (not shown) and a registration roll 53. Along the direction toward the secondary transfer unit 30. The secondary transfer device 30 transfers the toner image on the intermediate transfer belt 20 onto the paper by applying a transfer bias potential between the intermediate transfer belt 20 and the paper. The toner image is finally transferred onto the paper by the secondary transfer device 30. After the toner image formed on the surface of the intermediate transfer belt 20 is transferred onto the paper, the residual toner remaining on the intermediate transfer belt 20 is cleaned by the belt cleaning device 23.

  The sheet is further conveyed in the direction toward the fixing unit 90 along the sheet conveyance path R1, and the secondary transfer is performed between the fixing roll 41 and the pressure roll 42 facing each other of the fixing device 40 provided in the fixing unit 90. When the sheet that has passed through the container 30 is conveyed, unfixed toner constituting the toner image on the sheet is melted and fixed on the sheet by the heating mechanism 411 of the fixing roll 41. In this way, an image composed of a fixed toner image is formed on the paper.

  The sheet on which the image is formed is further conveyed in the direction toward the sheet discharge member 80 along the sheet conveyance path R1, and is discharged toward the sheet discharge table 70 by the sheet discharge member 80. The discharged sheets are stacked on the sheet discharge stand 70.

  Next, the structure around the paper discharge member 80 provided in the image forming apparatus 1 shown in FIG. 1 will be described in detail.

  FIG. 2 is a perspective view of the fixing unit 90 as viewed from the paper discharge table 70 side. FIG. 3 is a vertical cross-sectional view of the fixing unit 90 shown in FIG.

  As described above and as shown in FIG. 3, the sheet discharge member 80 is provided in the fixing unit 90 together with the fixing device 40.

  In the fixing unit 90, an inlet side guide member 91, an outlet side lower guide member 92, and an outlet side upper guide member 93 are provided.

  The inlet-side guide member 91 guides the sheet on which the toner image has passed through the secondary transfer device 30 (see FIG. 1) to between the fixing roller 41 and the pressure roller 42 of the fixing device 40 facing each other. This is a flat plate-like member that is inclinedly arranged on the inlet side of the fixing device 40.

  The outlet-side lower guide member 92 guides the sheet on which the image formed of the fixed toner image is formed by passing through the fixing unit 40 to the sheet discharge member 80 from between the fixing roll 41 and the pressure roll 42. 40 is a member provided on the outlet side of 40 and on the fixing roll 41 side (lower side in FIG. 3).

  The outlet-side upper guide member 93 passes the sheet on which the image formed of the fixed toner image has passed through the fixing device 40 to the sheet discharge member 80 from the fixing roll 41 and the pressure roll 42 to the outlet-side lower guide member. 92 is a member that is guided together with 92 and provided at a position facing the outlet side lower guide member 92 on the outlet side of the fixing device 40 and the pressure roll 42 side (upper side in FIG. 3). The outlet side upper guide member 93 is integrally formed on the lower surface of the upper cover 94 that covers the upper end surface of the fixing unit 90.

  The entrance-side guide member 91, the exit-side lower guide member 92, and the exit-side upper guide member 93 form a sheet transport path R1 in the fixing unit 90.

  The upper cover 94 is openable and closable with respect to the fixing unit 90 so that the paper transport path R1 in the fixing unit 90 is exposed to the outside and the paper jammed in the paper transport path R1 can be removed.

  The paper discharge member 80 includes two discharge rolls 811 and 812 that are responsible for paper discharge, and two pinch rolls 821 that are responsible for paper discharge together with the discharge rolls 811 and 812 with the paper sandwiched between the discharge rolls 811 and 812. 822.

  FIG. 4 is a front view of the paper discharge member 80 shown in FIGS. FIG. 5 is a perspective view of the fixing unit 90 as viewed from above.

  The two discharge rolls 811 and 812 of the paper discharge member 80 are rubber rolls that are fixed and rotated at mutually spaced positions on a common drive shaft 813 that is driven by a drive motor (not shown). . More specifically, the two discharge rolls 811 and 812 can handle not only discharge of a relatively large sheet such as A4 sheet, but also discharge of a relatively small sheet such as a postcard or an envelope. Each of them is fixed at a position closer to the central portion 8132 than the end portion 8131 of the drive shaft 813. The discharge rolls 811 and 812 correspond to an example of the first roll referred to in the present invention.

  The two pinch rolls 821 and 822 of the paper discharge member 80 are resin rolls corresponding to the two discharge rolls 811 and 812 and rotating in contact with the corresponding discharge rolls 811 and 812, respectively. These two pinch rolls 821 and 822 are so-called deforming the cross section in the width direction of the paper P that intersects the paper transport direction when the paper P passes between the discharge rolls 811 and 812 and the pinch rolls 821 and 822 into a waveform. It plays a role in forming corrugation. A detailed description of corrugation will be described later.

  The pinch rolls 821 and 822 each have a substantially cylindrical roll part 8211 and 8221 that are in contact with the discharge rolls 811 and 812, and both ends of the roll parts 8211 and 8221 via a small-diameter connecting part 8212 and 8222. And corrugation units 8213 and 8223 provided in the The corrugation parts 8213 and 8223 are formed with a larger diameter than the roll parts 8211 and 8221.

  Further, the two pinch rolls 821 and 822 are arranged such that the two pinch rolls 821 and 822 bring the corrugation parts 8213 and 8223 near the end 8131 of the drive shaft 813 of the discharge rolls 811 and 812 closer to the drive shaft 813. Thus, the roll has a rotation shaft 823 that is inclined in opposite directions and intersects with the drive shaft 813 of the discharge rollers 811 and 812. The inclination of the rotation shaft 823 of the pinch rolls 821 and 822 is determined by using two U-shaped wire springs 83 corresponding to the respective pinch rolls 821 and 822, and both ends of each U-shaped wire spring 83. The height of the corresponding fulcrum is configured to be different, and the connecting portions 8212 and 8222 of the corresponding pinch rolls 821 and 822 are pressed at the tips of the wire springs 83 with a uniform pressing force in the direction approaching the drive shaft 813. Realized. More specifically, as shown in FIG. 5, four protrusions 941, 942, 943 in which through holes functioning as fulcrums corresponding to both ends of the two wire springs 83 are formed on the upper surface of the upper cover 94. , 944 are formed, and the heights of the through holes formed in these four protrusions 941, 942, 943, 944 are set according to the inclination of the rotation shaft 823.

  In the present embodiment, the end portions of the pinch rolls 821 and 822 protrude beyond the end portions of the discharge rolls 811 and 812 corresponding to the end portions.

  Further, in this embodiment, the end portions of the pinch rolls 821 and 822 on the side closer to the drive shaft 813 among the both end portions in the rotation axis direction correspond to these end portions when viewed in the drive shaft direction. , At the position overlapping the ends of the discharge rolls 811, 812. That is, the end portions of the pinch rolls 821 and 822 that are close to the drive shaft 813 are positioned below the end portions of the discharge rolls 811 and 812 corresponding to the end portions in the pressing direction by the wire spring 83. Yes.

  The pinch rolls 821 and 822 configured as described above correspond to an example of the second roll referred to in the present invention.

  According to the paper discharge member 80 described above, the paper P passes between the discharge rolls 811 and 812 and the pinch rolls 821 and 822 as shown in FIG. While the cross section in the width direction is deformed into a waveform, that is, while corrugation is formed on the sheet P, the sheet P is discharged toward the sheet discharge table 70 (see FIG. 1). More specifically, the two pinch rolls 821 and 822 are opposite to each other so that the corrugations 8213 and 8223 near the end 8131 of the drive shaft 813 of the discharge rolls 811 and 812 are close to the drive shaft 813. Since it is inclined, as shown in FIG. 4, the vicinity of the center in the cross section in the width direction of the paper P intersecting with the paper transport direction is strongly deformed in a direction away from the drive shaft 813. Further, the vicinity of the end of the cross section in the width direction of the paper P that intersects the paper transport direction depends on the stiffness of the paper P itself, but here the paper P is pressed against the drive shaft 813 by the inclination of the pinch rolls 821 and 822. It is deformed in the direction away from the drive shaft 813 due to the reaction force caused by being applied.

  By forming such corrugation, the bending stiffness (stretch strength) in the paper transport direction is increased, and curling at the time of paper discharge is suppressed. Further, according to the paper discharge member 80 of the present embodiment, even if the inclination angle of the paper discharge table 70 (see FIG. 1) is increased in order to reduce the depth dimension of the image forming apparatus 1, the pinch roll is the discharge roll. Compared to the case where the rotation axis is parallel to the drive shaft, the force that deforms the cross section in the width direction of the paper P that intersects the paper conveyance direction into a waveform is strong. It is possible to avoid turning up of the paper when loading due to a collision.

  Further, according to the paper discharge member 80 of the present embodiment, as described above, the vicinity of the central portion in the cross section in the width direction of the paper P that intersects the paper transport direction is strongly deformed in the direction away from the drive shaft 813. A space is secured in the vicinity of the central portion 8132 of 813. Therefore, a protrusion having a desired shape can be formed on the central portion 8132 of the drive shaft 813. By forming a projection on the central portion 8132 of the drive shaft 813, for example, when ejecting an envelope with a lid that becomes narrower toward the rear side in the ejection direction, the rear end is pushed out by the projection.

  In the above-described embodiment, the first roll and the second roll referred to in the present invention have been described with reference to two discharge rolls and two pinch rolls. However, the first roll and the second roll referred to in the present invention are described. The roll is not limited to two sets, and may be, for example, four discharge rolls and four pinch rolls. In this case, each pinch roll is a roll having a rotation axis in which adjacent pinch rolls are inclined in opposite directions and intersect the rotation axis of the discharge roll, so that a stronger corrugation force can be obtained.

  Further, in the above-described embodiment, the second roll referred to in the present invention includes a substantially cylindrical roll portion that is in contact with the discharge roll, and a corrugation portion that is provided in a wheel shape at both ends of the roll portion via a small-diameter connecting portion. However, the second roll referred to in the present invention is not limited to this, and may be a substantially cylindrical roll in contact with the discharge roll, or the drive shaft of the discharge roll. You may have the corrugation part provided in the shape of a wheel via the small diameter connection part only in the side which approached. In this case, at least the end of the pinch roll on the side close to the drive shaft of the discharge roll among the both ends in the rotation axis direction is formed to have a larger diameter than the portion of the pinch roll in contact with the discharge roll. Thus, a stronger corrugation force can be obtained.

  Further, in the above-described embodiment, the second roll referred to in the present invention is configured so that the two pinch rolls are opposite to each other so that the corrugation portion near the end of the drive shaft of the discharge roll approaches the drive shaft. Although the example which is a roll which has a rotating shaft which inclines and intersects with the drive shaft of the discharge roll has been described, the plurality of second rolls referred to in the present invention is not limited to this, for example, two pinch rolls However, a roll having a rotation axis that is inclined in the opposite direction and intersects with the drive shaft of the discharge roll so that the corrugation portion near the center of the drive shaft of the discharge roll approaches the drive shaft. Even if comprised in this way, strong corrugation force can be obtained like this embodiment.

  Moreover, in embodiment mentioned above, the edge part of the pinch roll equivalent to an example of the 2nd roll said to this invention demonstrated and demonstrated the example which protruded from the edge part of the discharge roll corresponding to this edge part. However, the second roll referred to in the present invention is not limited to this, and the pinch rolls 821 and 822 corresponding to an example of the second roll on the side closer to the drive shaft at both ends in the rotation axis direction. The end part should just protrude beyond the edge part of the discharge roll corresponding to this end part. Thereby, stronger corrugation power can be obtained.

  In the above-described embodiment, the discharge rolls 811 and 812 corresponding to an example of the first roll according to the present invention are rubber rolls fixed to a position separated from one common drive shaft 813 as an example. However, the first roll according to the present invention is not limited to this, and the drive shaft 813 and the discharge rolls 811 and 812 may be integrally formed of resin instead of the rubber roller. . Thereby, the number of parts can be reduced.

  Further, even when the discharge rolls 811 and 812 corresponding to an example of the first roll according to the present invention are made of rubber, they need not be fixed to the drive shaft 813 and rotate with a certain rotational load. It may be installed as possible.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Personal computer 3 Image processing part 4 Control part 10Y, 10M, 10C, 10K Toner image formation part 11 Photoconductor 12 Charger 13 Exposure device 14 Developing device 141 Developing roller 15 Primary transfer device 16 Cleaning blade 20 Intermediate transfer Belt 21 Drive roll 22 Driven roll 23 Belt cleaning device 30 Secondary transfer device 40 Fixing device 41 Fixing roll 411 Heating mechanism 42 Pressure roll 50 Paper transport unit 51 Paper feed roll 52 Paper separation roll 53 Registration roll 60 Paper container 70 Ejection Paper base 80 Paper discharge member 811, 812 Discharge roll 813 Drive shaft 8131 End portion 8132 Central portion 821, 822 Pinch roll 8211, 8221 Roll portion 8212, 8222 Connection portion 8213, 8223 Corrugation 823 rotating shaft 90 fixing unit 91 inlet guide member 92 outlet lower guide member 93 outlet side upper guide member 94 top cover 941,942,943,944 projections

Claims (5)

A plurality of first rolls that are provided at positions separated from each other on a common rotating shaft;
A plurality of second rolls corresponding to each of the plurality of first rolls, in contact with the corresponding first roll, sandwiching the paper between the first rolls and taking charge of the paper together with the first roll;
The plurality of second rolls are rolls having rotation axes in which adjacent second rolls are inclined in opposite directions and intersect the rotation axis of the first roll.   Of the both ends of the second roll in the rotation axis direction, the end of the first roll that is in contact with the rotation axis of the first roll corresponds to the end of the first roll that is in contact with the second roll. The paper discharge device according to claim 1, wherein the paper discharge device protrudes beyond an end of the paper.   Of the two ends of the second roll in the direction of the rotation axis, when the end close to the rotation axis of the first roll is viewed in the direction of the rotation axis, the first roll contacts the first roll. 3. The paper discharge apparatus according to claim 1, wherein the roll is located at a position overlapping an end portion of the roll corresponding to the end portion.   Of the both ends of the second roll in the direction of the rotation axis, at least the end on the side close to the rotation axis of the first roll has a larger diameter than the portion of the second roll that contacts the first roll. The paper discharge device according to any one of claims 1 to 3, wherein the paper discharge device is formed. An image forming unit for forming an image on paper;
A sheet conveying member that conveys a sheet on a sheet conveying path passing through the image forming unit;
A paper discharge tray on which the paper on which the image is formed and discharged is placed;
A paper discharge member that discharges the paper on which the image is formed toward the paper discharge table;
The paper discharge member is
A plurality of first rolls that are provided at positions separated from each other on a common rotating shaft;
A plurality of second rolls corresponding to each of the plurality of first rolls, in contact with the corresponding first roll, sandwiching the paper between the first rolls and taking charge of the paper together with the first roll;
2. The image forming apparatus according to claim 1, wherein the plurality of second rolls are rolls having a rotation axis that intersects with a rotation axis of the first roll so that adjacent second rolls are inclined in opposite directions.

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