JP2010013263A - Sheet discharging device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet discharging device capable of neatly stacking sheets on a sheet stacking tray and an image forming device equipped with the sheet discharging device. <P>SOLUTION: In a state that blade parts 40d, 50d of rotors 40, 50 are arranged at pressing positions for respectively pressing both end parts of a sheet P1 discharged first, the next sheet P2 is discharged. After the next sheet P2 is discharged from a sheet discharging port to some extent, the blade parts 40d, 50d of the rotors 40, 50 respectively rotate to a direction of an arrow C and a direction of an arrow D, and press both end parts of the sheet P2 again after rotating nearly one revolution. An edge part of the sheet P2 discharged next does not push out a rear end part of the sheet P1 discharged first thereby, which can prevent the sheets from being disordered on a discharge tray 29. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sheet discharging apparatus that discharges a sheet and an image forming apparatus that forms an image on the sheet.

  The sheet discharge device needs to be configured so that the sheets discharged from the main body can be appropriately stacked on the discharged sheet stacking unit in the discharged order. However, when the main body is an image forming apparatus that forms an image on a sheet by, for example, an electrophotographic method, the sheet is discharged after being subjected to a heat fixing process. Will be discharged. It is an important problem to stack a plurality of sheets with the curls in order in the discharged sheet stacking unit.

FIG. 12 shows a conventional sheet discharge device 22. The conveyed sheet 7 is discharged from the discharge port 34 to the discharge sheet stacking unit 16 by a discharge roller (not shown). The discharge port 34 is provided with two pressing means 66 for pressing the sheet 7 discharged to the discharged sheet stacking unit 16. One holding means 66 is provided in the vicinity of both ends of the discharge port 34, and a holding member 68 provided so as to be swingable about the support shaft 76 is discharged from the discharge port 34 to the discharged sheet stacking unit 16. The sheet 7 is pressed near both ends. Since the sheet 7 tends to have large curls near both ends, the curling of the sheet 7 can be effectively corrected by arranging the pressing means 66 in the vicinity where both ends of the sheet 7 pass.
JP 2004-323131 A

  However, one end of the pressing member 68 is fitted to the support shaft 76, and is provided so as to be swingable about the support shaft 76. The pressing member 68 has the standing angle and weight of the sheet pressing member 68 set so as to maintain a balance between curl correction and conveyance resistance, and presses the discharged sheet 7 with its own weight. For this reason, when the sheet 7 with strong curl is discharged, the pressing member 68 rotates counterclockwise, and the both ends of the sheet 7 cannot be corrected. As a result, the leading end of the sheet 7 discharged later pushes out the rear end portion of the sheet 7 discharged earlier, and the sheets 7 stacked on the discharged sheet stacking unit 16 are disturbed.

  Accordingly, in order to solve the above problems, the present invention forms an image on a sheet discharging apparatus and a sheet that can orderly stack sheets on a discharged sheet stacking section even when a curled sheet is discharged. An object of the present invention is to provide an image forming apparatus.

  In order to solve the above problems, the invention described in claim 1 is a sheet discharge port for discharging a sheet, and a sheet stacking tray provided corresponding to the sheet discharge port and for stacking sheets discharged from the sheet discharge port. A plurality of rotating bodies provided to face each other in the sheet width direction orthogonal to the sheet discharging direction, and each rotating body has an axis extending in the discharging direction. A rotating shaft portion having an elastically deformable blade portion extending in the sheet width direction, and the blade portion rotates about the rotating shaft portion, thereby discharging the sheet to the sheet stacking tray. On the other hand, it is characterized in that it can be arranged at a pressing position for pressing both ends in the sheet width direction and at a retracted position retracted from the pressing position.

The invention described in claim 2 is characterized in that the rotating body is provided adjacent to the sheet discharge port in the discharge direction.

  The invention according to claim 3 is characterized in that the rotating shaft portion of the rotating body is provided above the discharge port in the vertical direction.

  According to a fourth aspect of the present invention, there is provided a rotating body control means for rotating the rotating body in accordance with the timing of the sheet discharged from the sheet discharge port.

  The invention according to claim 5 is characterized in that the rotating body is provided to be continuously rotatable.

  According to a sixth aspect of the present invention, there is provided a sheet discharging apparatus according to any one of the first to fifth aspects, and an image forming unit that forms an image on the sheet, wherein the sheet on which the image is formed by the image forming unit is a sheet. It is characterized by discharging with a discharging device.

  According to the first aspect of the present invention, the rotating body has a plurality of rotating bodies provided to face each other in the sheet width direction orthogonal to the sheet discharging direction, and each rotating body has an axis extending in the discharging direction. A rotating shaft portion having an elastically deformable blade portion extending in the sheet width direction, and the blade portion rotates about the rotating shaft portion, thereby discharging the sheet to the sheet stacking tray. On the other hand, it can be arranged at a pressing position for pressing both ends in the sheet width direction and at a retracted position retracted from the pressing position.

  Thereby, the sheet discharged to the sheet stacking tray is pressed at both ends in the sheet width direction by the blades of the rotating body. Therefore, the leading end portion of the sheet to be discharged next does not push out the trailing end portion of the previously discharged sheet, and the disturbance of the sheet on the sheet stacking tray can be prevented.

  According to the invention described in claim 2, the rotating body is provided adjacent to the sheet discharge port in the discharge direction.

  By disposing the rotating body adjacent to the sheet discharge port, it is possible to reliably press the curl of the sheet near the sheet discharge port. Thereby, it is possible to reliably prevent the vicinity of the sheet discharge opening from being blocked by the previously discharged sheet.

  According to invention of Claim 3, the rotating shaft part of a rotary body is provided above the discharge port in the perpendicular direction.

  Thereby, for example, even when a large number of sheets are discharged onto the sheet stacking tray, the rotation shaft portion of the rotating body is positioned above the discharge direction, so that the curl of the sheet can be reliably pressed. it can.

  According to the fourth aspect of the present invention, the rotating body control means for rotating the rotating body in accordance with the timing of the sheet discharged from the sheet discharge port is provided.

  As a result, the rotating body rotates in accordance with the sheet discharge timing, so that both end portions of the sheet can be pressed in accordance with the sheet discharge timing.

  According to invention of Claim 5, the rotary body is provided so that rotation is possible continuously.

  Thereby, the rotating body does not need to be controlled in rotation. Therefore, it is not necessary to provide a member for controlling the rotation, and it can be configured inexpensively and simply.

  According to a sixth aspect of the present invention, the sheet discharge apparatus according to any one of the first to fifth aspects and an image forming unit that forms an image on the sheet are provided, and a sheet on which an image is formed by the image forming unit is provided. The sheet is discharged by a sheet discharge device.

  By providing the sheet discharge apparatus according to any one of claims 1 to 5, an image forming apparatus having effects corresponding to each of the sheet discharge apparatuses is realized.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view showing a schematic configuration of a laser printer 1 as an image forming apparatus of the present invention. In FIG. 1, the right side of the drawing is the front side of the laser printer 1, and the left side of the drawing is the rear side. FIG. 2 is a perspective view of a paper discharge device 7 (corresponding to the sheet discharge device described in the claims) provided at the upper portion of the laser printer 1. In FIG. The diagonally upward direction is the rear, the diagonally upward right direction is the right, and the diagonally downward left direction is the left. FIG. 3 is an enlarged view of the vicinity of the rotating body 40 described later. 4 is a cross-sectional view taken along the line AA of FIG. 2. In FIG. 4, the right direction in the drawing is front, the left direction is rear, the front direction is left, and the back direction is right. FIG. 5 is a block diagram conceptually showing the electrical configuration of the laser printer 1.

  The laser printer 1 includes a substantially box-shaped main body casing 2. A paper feed tray 4 on which paper 3 for forming an image (corresponding to a sheet described in claims) is loaded is attached to the bottom of the main casing 2 so as to be able to be pulled out forward. A paper feed roller 5 is provided above the front end of the paper feed tray 4, and the paper 3 stacked on the top of the paper feed tray 4 as the paper feed roller 5 rotates is fed to the paper feed roller 5. It is sent out to a registration roller 6 provided on the upper rear side.

  A scanner unit 11 as an exposure unit is provided in the upper part of the main casing 2. The scanner unit 11 irradiates the surface of the photosensitive drum 19 with laser light L emitted from a laser light emitting unit (not shown) via a polygon mirror 12, a reflecting mirror 13, and a lens (not shown). .

  A process cartridge 15 is detachably attached to the main body casing 2 below the scanner unit 11. The process cartridge 15 includes a toner storage chamber (not shown) in which toner as a developer is stored, a supply roller 17, a developing roller 18 as a developing unit, a photosensitive drum 19 as an image carrier, and a scorotron charger. 20 and a transfer roller 21 as a transfer means.

  The toner released from the toner storage chamber is supplied to the developing roller 18 by the rotation of the supply roller 17. As the surface of the photosensitive drum 19 rotates, the surface of the photosensitive drum 19 is first uniformly charged positively by the scorotron charger 20 and then exposed by the laser light L from the scanner unit 11 to form an image to be formed on the paper 3. An electrostatic latent image corresponding to is formed. Next, the toner on the developing roller 18 is supplied to the surface of the photosensitive drum 19 by the rotation of the developing roller 18, and the electrostatic latent image is visualized. Thereafter, the toner image carried on the surface of the photosensitive drum 19 is transferred to the sheet by the transfer bias voltage applied to the transfer roller 21 while the sheet 3 passes between the photosensitive drum 19 and the transfer roller 21. 3 is transferred.

A fixing device 26 including a heating roller 24 and a pressure roller 25 is provided behind the process cartridge 15. In the fixing device 26, the toner image transferred onto the paper 3 is thermally fixed on the paper surface. Then, the heat-fixed paper 3 passes through a paper discharge sensor S1 provided on the downstream side of the fixing device 26, and is conveyed to a driving roller 27 and a driven roller 30 provided on the upper portion of the main body casing 2. The drive roller 27 is rotationally driven by the roller shaft 31, and the driven roller 30 abuts on the drive roller 27 and rotates following the drive roller 27. Further, the drive roller 27 and the driven roller 30 constitute a paper discharge port 28 (corresponding to a sheet discharge port described in claims).

  The sheet 3 is discharged onto a discharge tray 29 (corresponding to a sheet stacking tray in the claims) provided on the upper surface of the main body casing 2 as the driving roller 27 and the driven roller 30 rotate. The discharged paper 3 is curled so that both end portions in the width direction of the paper 3 (the left-right direction in FIG. 2, hereinafter referred to as the paper width direction) face upward.

  The curled portion of the discharged paper 3 in the width direction of the paper 3 is pressed by the blade portions 40d and 50d of the rotating bodies 40 and 50. Note that the blade portions 40d and 50d of the rotators 40 and 50 in FIG. 2 are arranged at pressing positions where the discharged paper 3 (not shown) is pressed. Details of the rotating bodies 40 and 50 will be described next.

  FIG. 2 is a perspective view of the paper discharge device 7. One rotator 40, 50 is provided at each end of the paper discharge device 7 in the paper width direction. The rotating bodies 40 and 50 are provided symmetrically. First, the rotating body 40 provided at the left end of the sheet discharge device 7 will be described.

  As shown in FIGS. 2 and 3, the rotating body 40 includes a columnar base portion 40a, a blade portion 40d extending from the base portion 40a toward the central portion of the discharge tray 29, and a gear provided on the base portion 40a. Part 40c and projection part 40e, which are rotatably provided via a first transmission gear 43, a second transmission gear 42, and a drive gear 41 by a driving force from a motor M (see FIG. 5). .

  The rotating body 40 is provided so as to rotate about a rotation shaft portion 40b that is the center of the base portion 40a, with the direction extending in the paper 3 discharge direction (front-rear direction, hereinafter referred to as the paper discharge direction) as an axis. . The rotating body 40 is rotatable when a gear portion 40c provided behind the base portion 40a is transmitted with a drive from an opposing drive gear 41.

  The drive gear 41 is disposed such that the rotation shaft thereof is in a direction orthogonal to the rotation shaft portion 40b. The first gear portion 41a meshes with the gear portion 40c of the rotating body 40, and the first gear portion 41a. It is comprised with the 2nd tooth | gear part 41b provided in the other side (left side). The second tooth portion 41 b meshes with the second transmission gear 42, and the second transmission gear 42 meshes with the first transmission gear 43. The first transmission gear 43 is attached to a roller shaft 31 that is a rotation shaft of the drive roller 27 and transmits a driving force for rotating the roller shaft 31.

  A lever 45 for stopping the rotation of the second transmission gear 42 and a solenoid 44 for moving the lever 45 are provided below the second transmission gear 42. The second transmission gear 42 is movably provided via a lever 45 by a solenoid 44. When the solenoid 44 is in an “on” state, the second transmission gear 42 meshes with the first transmission gear 43 and the drive gear 41, and is connected to the rotating body 40. It arrange | positions in the state which can transmit rotational driving force. Further, when the solenoid 44 is in the “off” state, the second transmission gear 42 is disposed so that the first transmission gear 43 and the driving gear 41 are disengaged and the rotational driving force is not transmitted to the rotating body 40.

Further, in the vicinity of the rotator 40, there is provided a rotation detection sensor S2 (shown only in FIG. 3) that includes a light emitting element and a light receiving element and detects the position of the protrusion 40e of the rotator 40. In the rotation detection sensor S2, the protrusion 40e protruding from the base 40a of the rotating body 40 blocks the light emitting element and the light receiving element, so that the blade part 40d is arranged at the pressing position (the position in FIGS. 2 and 3). Is detected. Here, the state in which the protrusion 40e blocks the light of the rotation detection sensor S2 is referred to as an off state, and the state in which the projection 40e is not blocked is referred to as an on state.

  Further, the rotating body 50 is provided at the right end of the paper discharge device 7, and, like the rotating body 40, is extended from the base 50 a toward the center of the paper tray 29 from the base 50 a. The blade part 50d and the gear part 50c provided in the base part 50a are provided.

  The rotator 50 is provided so as to rotate about a rotation shaft portion 50b that is the center of the base portion 50a with the direction extending in the paper discharge direction of the paper 3 as an axis. Further, the rotating body 50 is rotatable when a gear source 50c provided behind the base portion 50a is transmitted with a driving source from an opposing driving gear 51.

  The drive gear 51 is disposed such that the rotation axis thereof is in a direction orthogonal to the rotation shaft portion 50b. The first gear portion 51a that meshes with the gear portion 50c of the rotating body 50, and the first tooth portion 51a. It is comprised with the 2nd tooth | gear part 51b provided in the other side (right side). The second tooth portion 51b meshes with the second transmission gear 52 (see FIG. 4). The second transmission gear 52 meshes with the first transmission gear 53. The first transmission gear 53 is attached to a roller shaft 31 that is a rotation shaft of the drive roller 27.

  Also, below the second transmission gear 52, as with the left side, a lever (not shown) for stopping the rotation of the second transmission gear 52 and a solenoid 54 (see FIG. 5) for moving the lever. Is provided.

  FIG. 4 is a cross-sectional view taken along the line AA in FIG. 2 and shows a rotating body 50 and the like provided at the right end of the paper discharge device 7. The discharge tray 29 has a convex shape so as to curve from the rear side toward the front side in the paper discharge direction. The rotating body 50 is disposed adjacent to the paper discharge port 28 in the paper discharge direction. Further, the rotating shaft portion 50b of the rotating body 50 is disposed so as to be positioned above the sheet discharge port 28 in the vertical direction (vertical direction). Since the rotating bodies 40 and 50 are provided symmetrically to each other, the arrangement of the rotating bodies 40 provided at the left end of the paper discharge device 7 is the same as that of the rotating body 50.

  The blade portions 40d and 50d are made of an elastically deformable material such as a polyethylene terephthalate film (hereinafter referred to as a PET film). Further, the blade portions 40d and 50d are configured to have a length that comes into contact with the discharge tray 29 from the base portion 40a, and the tip portions thereof are shaped to face each other at the pressing position.

  Next, the electrical configuration of the laser printer 1 will be described. FIG. 5 is a block diagram conceptually showing the electrical configuration of the laser printer 1.

  The laser printer 1 includes a control device 80 including a CPU 81, a ROM 82, a RAM 83, a control unit 85, a network interface 84, and the like. The ROM 82 stores various control programs for controlling the laser printer 1, various settings, initial values, and the like. The RAM 83 is used as a work area from which various control programs are read or as a storage area for temporarily storing print data.

The CPU 81 outputs the processing result to R according to the control program read from the ROM 82.
Each component of the laser printer 1 is controlled via the control unit 85 while being stored in the AM 83.

  An external device such as a computer 86 is connected to the network interface 84 and receives a print command, print data, and the like transmitted from the computer 86.

  The control unit 85 includes an ASIC and is electrically connected to each component of the laser printer 1 such as the motor M, the paper discharge sensor S1, the rotation detection sensor S2, and the solenoids 44 and 54. The motor M is connected to the first transmission gears 43 and 53, the photoconductor 19 and the like described above via a gear mechanism (not shown), and is driven to rotate while synchronizing them.

  6 to 8 are diagrams for explaining the operation of the rotating bodies 40 and 50 and the blade portions 40d and 50d in conjunction with the discharge of the paper 3. FIG. In FIGS. 6 to 8, the rotation detection sensor S2 is omitted. FIG. 9 is a flowchart for explaining the operation of the sheet discharge device 7.

  FIG. 6 shows a state in which the blade portions 40d and 50d of the rotators 40 and 50 are arranged at the pressing positions for pressing the both ends of the paper P1 stacked on the discharge tray 29, respectively. FIG. 7 shows a state in which the next sheet P2 is discharged in a state where the blade portions 40d and 50d are arranged at the pressing positions. 6 and 7, the protrusion 40e of the rotating body 40 is in a state (off state) where the light from the rotation detection sensor S2 is blocked.

  FIG. 8 shows a state in which the blade portions 40d, 50d of the rotating bodies 40, 50 are arranged at positions (retracted positions) rotated by a predetermined amount in the directions of the arrows C and D, respectively.

  As shown in FIG. 9, first, in step a1, it is determined whether a print command, print data, or the like has been received. If there is a print instruction, the process proceeds to step a2 to start a paper feeding operation. Thereafter, when the sheet 3 is conveyed and conveyed to the position of the sheet discharge sensor S1, it is determined in step a3 that the sheet discharge sensor S1 is “ON”. Next, when it is determined in step a4 that X seconds have elapsed from the paper discharge sensor S1, the process proceeds to step a5 and the solenoids 44 and 54 are switched from the “off” state to the “on” state. Note that the leading end position of the sheet P2 when X seconds have elapsed from the sheet discharge sensor S1 is, for example, the position illustrated in FIG.

  When the solenoids 44 and 54 are switched to the “on” state, rotation of the rotating bodies 40 and 50 is started. The rotating bodies 40 and 50 rotate in the direction of arrow C and the direction of arrow D, respectively. FIG. 8 is a diagram in the middle of rotation of the blade portions 40d and 50d of the rotators 40 and 50. FIG. At this time, the blade portions 40d and 50d rotate over the side walls 8a and 8b provided at both ends in the paper width direction of the discharge tray 29 while elastically deforming.

  Thereafter, the rotators 40 and 50 rotate substantially once, and the protrusion 40e again blocks the light from the rotation detection sensor S2. When the rotation position sensor S2 is turned on in step a6, the process proceeds to step a7, and the solenoid 44 and 54 are turned off to stop the rotation. At this time, the blade portions 40d and 50d are disposed again at the pressing positions shown in FIG. 6 and are in a state of pressing both ends in the width direction of the paper P2. Next, the process proceeds to step a8. When there is a next sheet, the process returns to step a2, and when there is no next sheet, the process ends.

Thereby, the sheet discharged to the discharge tray 29 is pressed at both ends in the sheet width direction by the blade portions 40d and 50d of the rotating bodies 40 and 50. Therefore, the leading end portion of the paper P2 to be discharged next does not push out the rear end portion of the previously discharged paper P1, and the disturbance of the paper on the discharge tray 29 can be prevented. In addition, by arranging the rotating bodies 40 and 50 adjacent to the paper discharge port 28, it is possible to reliably press the curled portion of the paper 3 near the paper discharge port 28. Thereby, it is possible to reliably prevent the vicinity of the paper discharge port 28 from being blocked by the previously discharged paper.

  Further, the rotating shaft portions 40b and 50b of the rotating bodies 40 and 50 are provided above the sheet discharge port 28 in the vertical direction. Thereby, for example, even when a large amount of the sheet 3 is discharged onto the discharge tray 29, the rotating shafts 40b and 50b of the rotating bodies 40 and 50 are located above the sheet discharging direction, so that it is ensured. The curled portion of the paper 3 can be pressed.

  Further, the blade portions 40d and 50d of the rotating bodies 40 and 50 can be rotated in accordance with the discharge timing of the paper 3 by solenoids 44 and 54, a lever 45 and the like (corresponding to the rotating body control means described in the claims). The two ends of the paper 3 can be pressed in accordance with the timing at which the paper 3 is discharged.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is different from the first embodiment in that a plurality of blade portions 65 and 75 are provided and the rotating bodies 60 and 70 are continuously rotated.

  FIG. 10 is a perspective view of the paper discharge device 7. Each of the rotators 60 and 70 is provided at both ends of the paper discharge device 7 in the paper width direction. Since the rotating bodies 60 and 70 are provided symmetrically, the description of the rotating body 70 is omitted, and here, the rotating body 60 provided at the left end of the paper discharge device 7 will be described.

  The rotating body 60 includes a columnar base portion 60a, a plurality of blade portions 65 extending from the base portion 60a toward the central portion of the discharge tray 29, and a gear portion 60c provided on the base portion 60a. The driving force from the motor M is provided so as to continuously rotate via the driving gear 61.

  The rotating body 60 is provided so as to rotate in the direction of arrow E (rotating body 70 is in the direction of arrow F) with the sheet discharge direction of the sheet 3 as an axis and the rotation shaft portion 60b that is the center of the base 60a as the center. . The rotating body 60 is rotatable when a gear source 60c provided behind the base 60a is transmitted with a driving source from an opposing driving gear 61.

  The drive gear 61 is disposed so that the rotation shaft thereof is in a direction orthogonal to the rotation shaft portion 60b. The first gear portion 61a meshing with the gear portion 60c of the rotating body 60 and the first gear portion 61a It is comprised with the 2nd tooth | gear part 61b provided in the other side (left side). The second tooth portion 61b meshes with a gear (not shown). In the present embodiment, the rotating body gears 60 and 70 are continuously rotated by the motor M.

  Further, the blade portion 65 is made of an elastically deformable material such as a PET film, for example. In the present embodiment, eight blades (only four of 65a, 65b, 65c, and 65d are shown here for the sake of clarity). Are attached from the rotating body 60 at equal intervals. Further, the blade portions 65 and 75 are configured to have such a length as to contact the discharge tray 29 from the base portion 40a, and have a width and thickness as thin as about 0.3 mm.

  Next, operations of the rotating bodies 60 and 70 and the blade portions 65 and 75 will be described with reference to FIGS. 10 and 11. In addition, since the rotary body 60 (blade part 65) and the rotary body 70 (blade part 75) operate | move similarly, operation | movement of the rotary body 60 is demonstrated here.

FIG. 10 shows a state in which the paper P1 is discharged to the discharge tray 29. The paper P1 discharged first has its left end in the paper width direction pressed by a blade 65 (here 65c). In the blade portion 65, the blade portion 65c presses the paper P1 here, but since the rotating body 60 continuously rotates in the direction of arrow E, the blade portion 65b immediately presses against the paper. .

  In other words, since the blade portion 65c is disposed at a position where the blade portion 65b presses the paper P1, the paper P1 is always pressed by the blade portion 65. Further, as shown by the blade portion 65d, the blade portion 65 rotates while elastically deforming the side wall 8a of the discharge tray 29.

  FIG. 11 shows a state where the next sheet P2 is being discharged. In the next sheet P2, since the rear end portion of the sheet P1 discharged first is pressed by the blade portion 65 (65b in this case), the leading end portion of the sheet P2 discharged next is discharged first. It is possible to prevent the rear end of the paper P1 from being pushed. Further, even if the next discharged paper P2 comes into contact with a part of the blade portion 65, the blade portion 65 is configured to be thin with a width of about 0.3 mm, so that it can freely move in the paper discharge direction. Therefore, the paper P2 is not hindered from being discharged.

  As described above, in the second embodiment, the rotating bodies 60 and 70 are provided so as to be continuously rotatable by the drive gears 61 and 71 that drive the rotating bodies 60 and 70. Thereby, the rotation bodies 60 and 70 do not need to be controlled in rotation. Therefore, it is not necessary to provide a member for controlling the rotation, and it can be configured inexpensively and simply.

  In the first embodiment, the rotating bodies 40 and 50 stop the rotation when the protrusion 40e blocks the light of the rotation detection sensor S2, but it is not necessary to be limited to this. For example, the blade 40d The position of may be detected directly. Moreover, you may make it the rotary bodies 40 and 50 stop, for example after predetermined time progress.

  In the first embodiment, the rotation of the rotating bodies 40 and 50 is individually controlled by the solenoids 44 and 54. However, the present invention is not limited to this. For example, the drive gears 41 and 51 are used as shafts or the like. It is also possible to rotate integrally by connecting them with each other. In this case, the solenoids 44 and 54 may be provided on either one.

In the first embodiment and the second embodiment, the blade portions 40d, 50d, 65,
Although 75 is a PET film, it is not necessary to limit to this, and what is necessary is just what can be elastically deformed.

In the first embodiment and the second embodiment, the blade portions 40d, 50d, 65,
75 is rotating over the side walls 8a and 8b while being elastically deformed. However, the present invention is not limited to this. For example, the blades 40d, 50d, 65, and 75 are provided by providing notches in the side walls 8a and 8b. May pass through the notch.

  In the second embodiment, eight blade portions 67 and 75 are provided, but it is not necessary to limit to this.

  In the second embodiment, the width and thickness of the blade portions 67 and 75 are about 0.3 mm, but it is not necessary to limit to this.

It is a schematic sectional drawing of a laser printer. It is a perspective view of the blade | wing part and paper discharge apparatus of 1st Embodiment. It is an enlarged view near the blade | wing part of 1st Embodiment. It is sectional drawing of a paper discharge apparatus. 6 is a flowchart for explaining the operation of the paper discharge device. It is the figure where the blade | wing part of 1st Embodiment was arrange | positioned in the press position. It is the figure where the blade | wing part of 1st Embodiment was arrange | positioned in the press position. It is the figure where the blade | wing part of 1st Embodiment was arrange | positioned in the retracted position. 6 is a flowchart for explaining the operation of the paper discharge device. It is a figure which shows operation | movement of the blade | wing part of 2nd Embodiment. It is a figure which shows operation | movement of the blade | wing part of 2nd Embodiment. It is a figure which shows the conventional sheet discharge apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Laser printer 3 ... Paper 7 ... Paper discharge apparatus 8a, 8b ... Side wall 27 ... Drive roller 28 ... Paper discharge port 29 ... Discharge tray 30 ... Driven roller 31 ... Roller shaft 40,50,60,70 ... Rotating body 40a, 50a, 60a, 70a ... base 40b, 50b, 60b, 70b ... rotating shaft 40c, 50c, 60c, 70c ... gear 40d, 50d, 65, 75 ... vane 41, 51, 61, 71 ... drive gear 42, 52 ... 1st transmission gear 43,53 ... 2nd transmission gear 44,54 ... Solenoid

Claims (6)

A sheet discharge port for discharging the sheet;
A sheet discharge device provided corresponding to the sheet discharge port, and comprising a sheet stacking tray for stacking the sheets discharged from the sheet discharge port,
In the sheet width direction orthogonal to the sheet discharge direction, a plurality of rotating bodies provided to face each other,
Each of the rotating bodies includes a rotating shaft portion having an axis extending in the discharge direction, and an elastically deformable blade portion extending toward the sheet width direction,
The blade portion is revolved around the rotation shaft portion, thereby retreating from the pressing position for pressing the both ends in the sheet width direction with respect to the sheet discharged to the sheet stacking tray. A sheet discharge device characterized in that it can be disposed at a retracted position.   The sheet discharging apparatus according to claim 1, wherein the rotating body is provided adjacent to the sheet discharging port in the discharging direction.   The sheet discharging apparatus according to claim 1, wherein the rotation shaft portion of the rotating body is provided above the discharge port in the vertical direction.   The sheet discharging apparatus according to claim 1, further comprising a rotating body control unit that rotates the rotating body in accordance with a timing of the sheet discharged from the sheet discharge port.   The sheet discharging apparatus according to claim 1, wherein the rotating body is provided to be continuously rotatable. A sheet discharging apparatus according to any one of claims 1 to 5,
An image forming unit that forms an image on the sheet;
An image forming apparatus, wherein the sheet on which the image is formed by the image forming unit is discharged by the sheet discharge device.