JP2006082910A - Image formation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently enhancing stacking property and to prevent indentation of a pressing member from being left on a medium. <P>SOLUTION: The image formation device has a drive part for discharge; a first roller transmitted with rotation of the drive part; a second roller pressure-contacting the first roller; and the pressing member arranged adjacent to one roller of the first and second rollers and pressing the medium. A pressing part for pressing the medium in the pressing member is moved and positioned in an axial direction of the first and second rollers. Since the pressing part is moved, the stacking property can be sufficiently enhanced only by moving the pressing part making relevant to strong flexibility and the indentation of the pressing member can be prevented from being left on the medium. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image forming apparatus.

  2. Description of the Related Art Conventionally, in an image forming apparatus such as a printer, a copier, or a facsimile, an image is formed on a sheet as a sheet-like medium, and the sheet on which the image is formed is discharged to a discharge stacker by a pair of discharge rollers. ing.

  A corrugation forming roller (hereinafter referred to as a “corrugation roller”) having a flange or the like is used as a discharge roller so that the paper is not curled and stacked when discharged to the discharge stacker. A wave forming guide (hereinafter referred to as “corrugation guide”) is disposed between the rollers. The pressing member such as the corrugation roller and the corrugation guide presses the supplied paper, forms a wave in the pressed paper in a direction perpendicular to the paper conveyance direction, and strengthens the paper. , Prevent paper from curling up and stacking.

Therefore, the front end of the paper can be landed farther than the pressing member on the paper discharge stacker, and the stacking property can be improved (for example, see Patent Document 1).
JP 2002-362808 A

  However, in the conventional image forming apparatus, when a stiff paper such as a thick paper is used, if the corrugation is too strong, an indentation of the pressing member remains on the paper, and a thin paper such as a thin paper is used. In this case, if the undulation is too weak, the undulation cannot be formed on the sheet, the sheet is curled, and the stacking property cannot be sufficiently improved.

  The present invention solves the problems of the conventional image forming apparatus, and provides an image forming apparatus capable of sufficiently improving stacking properties and preventing the impression of the pressing member from remaining on the medium. For the purpose.

  For this purpose, in the image forming apparatus of the present invention, a discharge driving unit, a first roller that is rotatably disposed and to which rotation of the driving unit is transmitted, and a first roller are rotatably disposed. A second roller pressed against one roller, and a pressing member disposed adjacent to one of the first and second rollers to press the medium.

  A pressing portion that presses the medium in the pressing member is moved and positioned in the axial direction of the first and second rollers.

  According to the present invention, in the image forming apparatus, the discharge driving unit and the first roller which is rotatably disposed and to which the rotation of the driving unit is transmitted are rotatably disposed. A second roller pressed against one roller, and a pressing member disposed adjacent to one of the first and second rollers to press the medium.

  A pressing portion that presses the medium in the pressing member is moved and positioned in the axial direction of the first and second rollers.

  In this case, since the pressing portion that presses the medium in the pressing member is moved and positioned in the axial direction of the first and second rollers, various types of media having different waist strengths can be used. The stacking property can be sufficiently improved and the impression of the pressing member can be prevented from remaining on the medium only by moving the pressing portion in accordance with the strength of the medium. In addition, stacking performance can be improved by simply moving the pressing portion, and the impression of the pressing member can be prevented from remaining on the medium. Therefore, there is no need to replace parts, thereby simplifying the operation. be able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a printer of the image forming apparatus will be described.

  FIG. 2 is a schematic view of the printer according to the first embodiment of the present invention.

  As shown in the drawing, in the printer 10, a sheet 34 as a medium is set in a medium cassette 13, separated one by one by a sheet feeding roller 14 and a separation frame 15, and then fed. 16 is reached. When the front end of the paper 34 is detected by the feeding sensor 16, the paper 34 is transported by the pair of registration rollers 17 and sent to the transport path 18. Next, the sheet 34 reaches the passage sensor 20, and when the front end of the sheet 34 is detected by the passage sensor 20, the image forming unit 21 starts forming a toner image as a developer image.

  In the image forming unit 21, the surface of the photosensitive drum 23 as an image carrier that rotates in the direction of the arrow is charged to a negative polarity by a charging roller 24 as a charging device. When the negatively charged portion comes under the LED head 25 as an exposure device as the photosensitive drum 23 rotates, the LED head 25 irradiates the surface of the photosensitive drum 23 to generate an image. An electrostatic latent image corresponding to the data is formed. Subsequently, the electrostatic latent image is developed by a developing roller 26 as a developer carrying member to form a toner image. The toner image is transferred to a sheet 34 sent between the image forming unit 21 and a transfer roller 22 as a transfer device, and the sheet 34 is sent to the fixing device f1. The toner image on 34 is fixed on the paper 34 at high temperature and high pressure by the heat roller 27 and the backup roller 30. Subsequently, the sheet 34 is discharged to the discharge stacker 31 by a roller pair 101 including a discharge roller 32 as a first roller and a driven roller 33 as a second roller disposed in the medium discharge portion P1.

  FIG. 1 is a diagram showing a first state of a medium discharge unit according to the first embodiment of the present invention, FIG. 3 is a perspective view of a corrugation guide according to the first embodiment of the present invention, and FIG. The figure which shows the attachment state of the corrugation guide in 1st Embodiment, FIG. 5 is a top view of the opening part in 1st Embodiment of this invention, FIG. 6 is the medium discharge | emission in 1st Embodiment of this invention It is a figure which shows the 2nd state of a part.

  In the figure, 32 is a discharge roller that is attached to a plurality of predetermined locations of the shaft 48 and is rotatably arranged with the shaft 48, 33 is a driven roller that is rotatably arranged corresponding to each discharge roller 32, Reference numeral 41 denotes a spring as an urging member engaged with a discharge guide (not shown), 41a denotes a bearing portion formed at the tip of the spring 41, and the driven roller 33 is rotatably supported by the bearing portion 41a. And, it is urged downward by the urging force of the spring 41 and is brought into pressure contact with the discharge roller 32. The discharge roller 32 is connected to a discharge motor as a discharge drive unit (not shown), and the rotation generated by driving the discharge motor is transmitted to each discharge roller 32 through a shaft 48. Each driven roller 33 is rotated as the discharge roller 32 rotates.

  Reference numeral 43 denotes a support member disposed above the medium discharge portion P1. The support member 43 extends along the axial direction of the roller pair 101 and sandwiches each driven roller 33 therebetween. In addition, a corrugation guide 42 as a pair of pressing members is attached to the support member 43 so as to be adjacent to the driven roller 33 and presses the paper 34.

  Therefore, a pair of openings 44 having a shape as shown in FIG. 5 is formed on both sides of each discharge roller 32 along the axial direction of the roller pair 101. The corrugation guide 42 has a main body 103, a neck 104 formed to protrude upward at the center of the upper end of the main body 103, and a right angle with respect to the main body 103 above the neck 104. A handle portion 45 is formed in the direction of. A curved portion 105 having a concave surface is formed at the lower end of the main body portion 103. The curved portion 105 extends in an arc shape, and an introduction portion 106 into which the paper 34 discharged from the fixing device f1 is introduced, and the introduction portion. 106 is provided adjacent to 106 and includes a discharge unit 107 that discharges the paper 34 in the horizontal direction. A protrusion 46 is formed on the rear end surface of the neck 104 (the left end surface in FIG. 3).

  The opening 44 is formed to have a wide insertion portion 44 a for inserting the handle portion 45 and to communicate with the insertion portion 44 a and to adjust the corrugation guide 42 to the support member 43. A projection 44 is provided on the inner peripheral edge of the rear end (left end in FIG. 5) of the adjustment portion 44b over a predetermined distance.

  Accordingly, the corrugation guide 42 allows the support member 43 to be inserted by inserting the handle portion 45 into the insertion portion 44a, placing the handle portion 45 above the support member 43, and engaging the protrusions 46 with the projections 47. It is attached. Further, the corrugation guide 42 can be placed at a predetermined position with respect to the paper 34 by gripping the handle portion 45 and moving the neck portion 104 along the adjustment portion 44b in the direction of the arrow in FIG. The pressing portion that presses the paper 34 in the corrugation guide 42 is moved and positioned in the axial direction of the roller pair 101. As shown in FIG. 4, when the corrugation guide 42 is attached to the support member 43, the bent portion 107 is positioned so that the discharge portion 107 is lower than the tangent line a between the discharge roller 32 and the driven roller 33. 105 is formed.

  Next, the operation of the medium discharge unit having the above configuration will be described.

  First, the printed paper 34 is sandwiched between the discharge roller 32 and the driven roller 33 by the rotation of the discharge roller 32 and is discharged to the discharge stacker 31 (FIG. 2). At this time, a portion of the paper 34 sandwiched between the discharge roller 32 and the driven roller 33 is discharged along the tangent line a, and a portion conveyed along the corrugation guide 42 is along the extension line b of the discharge portion 107. Therefore, the discharged paper 34 is formed with a undulation of the undulation amount c, and the paper 34 can be stiffened.

  Therefore, when a low-stiff paper 34 such as thin paper is used, if the distance between each corrugation guide 42 and the center of the driven roller 33 is shortened to L1, as shown in FIG. It can be formed, and the waist of the paper 34 can be made sufficiently strong. As a result, it is possible to prevent the sheets 34 from being curled up and stacked, so that the front end of the sheet 34 can be landed farther than the corrugation guide 42 on the sheet discharge stacker 31, and the stacking property can be improved.

  Further, when a stiff paper 34 such as thick paper is used, as shown in FIG. 6, if the distance between each corrugation guide 42 and the center of the driven roller 33 is set to L2 (> L1), the paper It is possible to prevent the indentation due to the corrugation guide 42 from remaining on 34.

  As described above, even when various types of paper 34 having different waist strengths are used, the stacking property can be sufficiently improved by merely moving the corrugation guide 42 according to the waist strength of the various papers 34. It is possible to prevent the corrugation guide 42 from remaining on the paper 34. In addition, stacking performance can be improved by simply moving the corrugation guide 42, or the indentation of the corrugation guide 42 can be prevented from remaining on the paper 34. Therefore, there is no need to replace parts, and work can be performed. It can be simplified.

  Since the corrugation guide 42 can be fixed to the support member 43 by engaging the protrusions 46 with the projections 47, the distances L1 and L2 can be made constant. Therefore, even if the stiff paper 34 is discharged, the position of the corrugation guide 42 does not change, so that the stacking property does not fluctuate.

  If the thickness of the paper 34 to be used, that is, the stiffness of the paper 34 is not known, a paper thickness detection device (not shown) is provided in the transport path 18, and the thickness of the paper 34 is detected by the paper thickness detection device. , The conveyance of the paper 34 is temporarily stopped, and the thickness of the paper 34 is displayed on the display unit (not shown) of the printer 10 as different, for example, thick, normal, or thin, and notified to the operator. can do. In addition to starting the printing after notifying the thickness to the operator, it can be automatically performed after a predetermined time has elapsed, in addition to the key input by the operator.

  In the present embodiment, a portion of the corrugation guide 42 that contacts the paper 34, for example, the discharge unit 107 can be provided with a driven roller that is rotated as the paper 34 is conveyed.

  Next, a second embodiment of the present invention will be described. In addition, the effect of the same embodiment is used for the effect of the invention by having the same structure as the first embodiment.

  FIG. 7 is a view showing a first state of the medium discharge section according to the second embodiment of the present invention, FIG. 8 is a view showing details of the medium discharge section according to the second embodiment of the present invention, and FIG. It is a figure which shows the 2nd state of the medium discharge part in the 2nd Embodiment of this invention.

  In the figure, 32 is a discharge roller as a first roller, 33 is a driven roller as a second roller, 48 is a shaft, and the discharge roller 32 and the driven roller 33 constitute a roller pair 101. Reference numeral 51 denotes a spring as a wire-like biasing member whose one end is engaged with a discharge guide (not shown) and presses the driven roller 33 against the discharge roller 32, and 52 is a pair as a pressing member and as a pressing roller. The corrugation roller 52 is fitted on the shaft 53 one by one on both sides of the driven roller 33 and adjacent to the driven roller 33. Two positioning members 54 are disposed on both sides of the corrugation roller 52, and the positioning members 54 are positioned with the corrugation roller 52 interposed therebetween. As shown in FIG. 8, a male screw 53 a is formed on the outer peripheral surface of the shaft 53, and a female screw (not shown) is formed on the positioning member 54. Note that when the corrugation roller 52 is attached to the shaft 53, the dimension of the corrugation roller 52 is set so that the uppermost portion of the corrugation roller 52 is higher than the tangent line between the discharge roller 32 and the driven roller 33. .

  Here, by rotating the positioning member 54, the male screw 53a and the female screw are screwed together, and after tightening the corrugation roller 52 is loosened, the corrugation roller 52 is moved along the shaft 53, and then By rotating the positioning member 54 again, the male screw 53a and the female screw are screwed together and the positioning member 54 is tightened, whereby the distance between each corrugation roller 52 and the center of the driven roller 33 can be changed. The pressing portion that presses the paper 34 as the medium in the corrugation roller 52 is moved and positioned in the axial direction of the roller pair 101.

  Next, the operation of the medium discharge unit having the above configuration will be described.

  First, the printed paper 34 is sandwiched between the discharge roller 32 and the driven roller 33 by the rotation of the discharge roller 32 and is discharged to the discharge stacker 31 (FIG. 2). At this time, a portion of the paper 34 sandwiched between the discharge roller 32 and the driven roller 33 is discharged along a tangent line, and a portion conveyed along the corrugation roller 52 is along the uppermost tangent line of the corrugation roller 52. Accordingly, the discharged paper 34 is formed with a predetermined amount of undulation, and the paper 34 can be stiffened.

  Therefore, when the low-stiff paper 34 such as thin paper is used, as shown in FIG. 7, if the distance between each corrugation roller 52 and the center of the driven roller 33 is shortened, the paper 34 is wavy. And the waist of the paper 34 can be made sufficiently strong. As a result, it is possible to prevent the sheets 34 from being curled up and stacked, so that the front end of the sheet 34 can be landed farther than the corrugation roller 52 on the sheet discharge stacker 31, and stackability can be improved.

  Further, when the stiff paper 34 such as thick paper is used, as shown in FIG. 9, if the distance between each corrugation roller 52 and the center of the driven roller 33 is increased, the indentation by the corrugation roller 52 is applied to the paper 34. Can be prevented from remaining.

  Next, a third embodiment of the present invention will be described. In addition, about the thing which has the same structure as 2nd Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the embodiment is used about the effect of the invention by having the same structure. .

  FIG. 10 is a diagram showing details of the medium discharge section in the third embodiment of the present invention, FIG. 11 is a front view of a clip in the third embodiment of the present invention, and FIG. 12 is a third embodiment of the present invention. It is a perspective view of the clip in the form of.

  In this case, in order to position the corrugation roller 52 as the pressing member and as the pressing roller, positioning clips 56 are disposed on both sides of the corrugation roller 52 as shown in FIG. The clip 56 includes an outer fitting portion 111 having a “C” shape that is partially opened in order to fit the shaft 53 outwardly. An arc-shaped protrusion 56a as one engaging portion is formed in the circumferential direction. On the other hand, on the outer peripheral surface of the shaft 53, a plurality of irregularities 53b as second engaging portions are formed in the axial direction. Therefore, the clip 56 can be positioned and the corrugation roller 52 can be positioned by engaging the protrusion 56a and the concavo-convex 53b. As a result, the distance between each corrugation roller 52 and the center of the driven roller 33 can be changed. The pressing portion that presses the paper 34 as the medium in the corrugation roller 52 is moved and positioned in the axial direction of the roller pair 101.

  Further, a rubber roller can be used in place of the corrugation roller 52, and the rubber roller can be press-fitted into the shaft 53 and moved on the shaft 53.

  Next, a fourth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st-3rd embodiment, the description is abbreviate | omitted by giving the same code | symbol, About the effect of invention by having the same structure, the effect of the embodiment Is used.

  FIG. 13 is a view showing a first state of the medium discharge section in the fourth embodiment of the present invention, and FIG. 14 is a view showing a second state of the medium discharge section in the fourth embodiment of the present invention. is there.

  In this case, the corrugation roller 52 as the pressing member and as the pressing roller is rotatable with respect to the shaft 48 of the discharge roller 32 as the first roller, is movable in the axial direction, and is discharged. A taper portion 61 that is attached adjacent to the roller 32 and is inclined so as to face the discharge roller 32 is formed on the outer peripheral edge of the corrugation roller 52. The corrugation roller 52 is urged by a coil spring 62 as an urging member toward the discharge roller 32 side (arrow A direction). Reference numeral 63 denotes an E-ring as a restricting member disposed at a predetermined position on both sides of the corrugation roller 52. The E-ring 63 restricts the movement of the corrugation roller 52 and the coil spring 62 in the axial direction. The E-ring 63 disposed on the discharge roller 32 side is disposed at a predetermined distance from the discharge roller 32. The pressing portion that presses the paper 34 as the medium in the corrugation roller 52 is moved and positioned in the axial direction of the roller pair 101.

  Next, the operation of the medium discharge unit having the above configuration will be described.

  First, the printed paper 34 is sandwiched between the discharge roller 32 and the driven roller 33 as the second roller by the rotation of the discharge roller 32, and is discharged to the discharge stacker 31 (FIG. 2). At this time, a portion of the paper 34 sandwiched between the discharge roller 32 and the driven roller 33 is discharged along a tangent line, and a portion conveyed along the corrugation roller 52 is along the uppermost tangent line of the corrugation roller 52. Accordingly, the discharged paper 34 is formed with a predetermined amount of undulation, and the paper 34 can be stiffened.

  When a low-stiff paper 34 such as thin paper is used, the corrugation roller 52 is urged toward the discharge roller 32 by the urging force of the coil spring 62 as shown in FIG. It is done. Therefore, the distance between each corrugation roller 52 and the center of the discharge roller 32 is shortened, and undulation can be formed on the paper 34, so that the waist of the paper 34 can be sufficiently strengthened. As a result, it is possible to prevent the sheets 34 from being curled up and stacked, so that the front end of the sheet 34 can be landed farther than the corrugation roller 52 on the sheet discharge stacker 31, and stackability can be improved.

  Further, when the stiff paper 34 such as thick paper is used, the corrugation roller 52 is moved away from the discharge roller 32 against the urging force of the coil spring 62 as shown in FIG. Therefore, the distance between each corrugation roller 52 and the center of the discharge roller 32 is increased, and it is possible to prevent the impression caused by the corrugation roller 52 from remaining on the paper 34.

  In addition, since the distance between each corrugation roller 52 and the center of the discharge roller 32 can be changed according to the strength of the paper 34, even if various papers 34 having different waist strengths are used. The stacking property can be improved in accordance with the strength of the waist, and indentation due to the corrugation roller 52 can be prevented from remaining on the paper 34.

  Next, a fifth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 4th Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the embodiment is used about the effect of the invention by having the same structure. .

  FIG. 15 is a diagram showing a state of the medium discharge unit in the fifth embodiment of the present invention.

  In this case, an E-ring 63 as a restricting member as the pressing member in the fourth embodiment and outside the corrugation roller 52 as the pressing roller, that is, on the side away from the discharge roller 32 as the first roller. Instead, a clip 56 similar to that of the third embodiment is used as a member for adjusting the urging force of the coil spring 62 as the urging member, and a protrusion as a first engaging portion is provided on the clip 56. 56a (FIG. 12) is formed. On the other hand, on the outer peripheral surface of the shaft 48 of the discharge roller 32, a plurality of irregularities 48a as second engaging portions are formed in the axial direction. Therefore, the clip 56 can be positioned and the corrugation roller 52 can be positioned by engaging the projection 56a with the projections and recesses 48a. The pressing portion that presses the paper 34 as the medium in the corrugation roller 52 is moved and positioned in the axial direction of the roller pair 101. In this case, the distance between each corrugation roller 52 and the center of the discharge roller 32 can be made larger than that of the fourth embodiment and can be changed.

  Then, by disposing the clip 56 away from the discharge roller 32, the distance between each corrugation roller 52 and the center of the discharge roller 32 is further increased, and the indentation due to the corrugation roller 52 remains on the paper 34. This can be further prevented.

  Further, since the urging force of the coil spring 62 is adjusted by moving the clip 56, stacking performance can be improved even when various types of paper 34 are used.

  Next, a sixth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st-5th embodiment, the description is abbreviate | omitted by giving the same code | symbol, About the effect of invention by having the same structure, the effect of the same embodiment Is used.

  FIG. 16 is a view showing a first state of the medium discharge portion in the sixth embodiment of the present invention, FIG. 17 is a view showing a main portion of the medium discharge portion in the sixth embodiment of the present invention, and FIG. FIG. 19 is a view showing the arrangement state of the corrugation guide in the sixth embodiment of the present invention, and FIG. 19 is a view showing the second state of the medium discharge section in the sixth embodiment of the present invention.

  In the figure, 71 has a circular shape, and is a corrugation guide as a pressing member and inclined as an angle θ with respect to the shaft 72, and the shaft 72 serves as a medium. A discharge roller 32 serving as a first roller and a driven roller 33 serving as a second roller are disposed in parallel to the shaft 48 on the downstream side from the position where the discharge roller 32 serving as a second roller and the driven roller 33 serve as a second roller.

  A pair of corrugation guides 71 are disposed on both sides of the driven roller 33 so as to be adjacent to the driven roller 33, and the inclinations of the corrugation guides 71 are opposite to each other. That is, at the same position in the circumferential direction of the corrugation guides 71, the distance between the corrugation guides 71 is set to the smallest L3, and the corrugation guides 71 are spaced apart from each other by 180 [°] in the circumferential direction. The distance between 71 is the largest and is set to L4.

  Further, in order to rotate the shaft 72 and the corrugation guide 71, a pressing motor 74 as a pressing drive unit is provided, and the driven gear g 1 of the end portion of the shaft 72 is connected to the pressing motor 74. A drive side gear g2 is attached to the output shaft, and the gears g1 and g2 are engaged with each other. Therefore, when the shaft 72 is rotated by driving the pressing motor 74 and the corrugation guide 71 is rotated in the direction of the arrow as shown in FIG. 17, the distance between the lowermost portions of the corrugation guide 71 that contacts the paper 34. Can be set to an arbitrary value between the distances L3 and L4. The pressing portion that presses the paper 34 in the corrugation guide 71 is moved and positioned in the axial direction of the roller pair 101 (FIG. 2).

  In addition, in the present embodiment, an encoder 75 as a detection unit for detecting the rotational position of the corrugation guide 71 is disposed in a predetermined portion of the shaft 72, in the vicinity of the gear g2, and is detected by the encoder 75. The corrugation guide 71 can be placed at a predetermined position based on the rotated position.

  Next, the operation of the medium discharge unit having the above configuration will be described.

  First, the printed paper 34 is sandwiched between the discharge roller 32 and the driven roller 33 by the rotation of the discharge roller 32 and is discharged to the discharge stacker 31. At this time, a portion of the paper 34 sandwiched between the discharge roller 32 and the driven roller 33 is discharged along the tangent line d, and a portion conveyed along the corrugation guide 71 is the tangent line e at the top of the corrugation guide 71. Accordingly, the discharged paper 34 is formed with a predetermined amount of undulations, and the paper 34 can be stiffened.

  When a low-stiff paper 34 such as thin paper is used, the distance between the lowermost portions of the corrugation guides 71 is shortened as shown in FIG. Accordingly, the distance between each corrugation guide 71 and the center of the driven roller 33 is shortened, and undulation can be formed on the paper 34, so that the waist of the paper 34 can be sufficiently strengthened. As a result, the paper 34 can be prevented from curling and stacking, so that the front end of the paper 34 can be landed farther than the corrugation guide 71 on the paper discharge stacker 31 and the stacking property can be improved.

  Further, when using a stiff paper 34 such as thick paper, the distance between the lowermost portions of the corrugation guides 71 is increased as shown in FIG. Therefore, the distance between each corrugation guide 71 and the center of the driven roller 33 is increased, and it is possible to prevent the impression caused by the corrugation guide 71 from remaining on the paper 34.

  In the present embodiment, the distance between the lowermost portions of the corrugation guides 71 is driven by driving the pressing motor 74 and rotating the shaft 72 based on the setting information such as the thickness and type of the paper 34. Can be changed for each sheet 34. In addition, when a problem occurs in the wave set based on the setting information, the waving amount can be made appropriate.

  Next, a seventh embodiment of the present invention will be described. In addition, about the thing which has the same structure as 6th Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the embodiment is used about the effect of the invention by having the same structure. .

  FIG. 20 is a view showing the arrangement state of the corrugation guide according to the seventh embodiment of the present invention, and FIG. 21 is a view showing the main part of the shaft according to the seventh embodiment of the present invention.

  As shown in the figure, an inclined shaft portion 81 is formed by inclining a part of the shaft 72, and a corrugation guide 71 as a pressing member and as a pressing roller rotates in the direction of the arrow with respect to the inclined shaft portion 81. Arranged freely. Therefore, the frictional resistance between the corrugation guide 71 and the sheet 34 (FIG. 20) as a medium can be reduced.

  In each of the above-described embodiments, an example in which the present invention is applied to a printer as an image forming apparatus has been described. However, the present invention can also be applied to an original discharge unit of an original reading apparatus such as a scanner.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a figure which shows the 1st state of the medium discharge part in the 1st Embodiment of this invention. 1 is a schematic diagram of a printer according to a first embodiment of the present invention. It is a perspective view of the corrugation guide in the 1st Embodiment of this invention. It is a figure which shows the attachment state of the corrugation guide in the 1st Embodiment of this invention. It is a top view of the opening part in the 1st Embodiment of this invention. It is a figure which shows the 2nd state of the medium discharge part in the 1st Embodiment of this invention. It is a figure which shows the 1st state of the medium discharge part in the 2nd Embodiment of this invention. It is a figure which shows the detail of the medium discharge part in the 2nd Embodiment of this invention. It is a figure which shows the 2nd state of the medium discharge part in the 2nd Embodiment of this invention. It is a figure which shows the detail of the medium discharge part in the 3rd Embodiment of this invention. It is a front view of the clip in the 3rd Embodiment of this invention. It is a perspective view of the clip in the 3rd Embodiment of this invention. It is a figure which shows the 1st state of the medium discharge part in the 4th Embodiment of this invention. It is a figure which shows the 2nd state of the medium discharge part in the 4th Embodiment of this invention. It is a figure which shows the state of the medium discharge part in the 5th Embodiment of this invention. It is a figure which shows the 1st state of the medium discharge part in the 6th Embodiment of this invention. It is a figure which shows the principal part of the medium discharge part in the 6th Embodiment of this invention. It is a figure which shows the arrangement | positioning state of the corrugation guide in the 6th Embodiment of this invention. It is a figure which shows the 2nd state of the medium discharge part in the 6th Embodiment of this invention. It is a figure which shows the arrangement | positioning state of the corrugation guide in the 7th Embodiment of this invention. It is a figure which shows the principal part of the shaft in the 7th Embodiment of this invention.

Explanation of symbols

32 discharge roller 33 driven roller 34 paper 41, 51 springs 42, 71 corrugation guide 43 support members 48, 53, 72 shaft 52 corrugation roller 56 clip 61 taper portion 62 coil spring P1 medium discharge portion

Claims (8)

(A) a drive unit for discharge;
(B) a first roller which is rotatably arranged and to which the rotation of the drive unit is transmitted;
(C) a second roller that is rotatably disposed and is in pressure contact with the first roller;
(D) having a pressing member disposed adjacent to one of the first and second rollers and pressing the medium;
(E) An image forming apparatus characterized in that a pressing portion that presses the medium in the pressing member is moved and positioned in the axial direction of the first and second rollers.   The image forming apparatus according to claim 1, wherein the pressing member is attached to a support member disposed in the medium discharge unit.   The image forming apparatus according to claim 1, wherein a driven roller is rotatably disposed at a contact portion of the pressing member that contacts the medium.   The image forming apparatus according to claim 1, wherein the pressing member is a pressing roller disposed on a shaft of one of the first and second rollers.   The pressure roller has a tapered portion formed on a side facing one of the first and second rollers, and is biased toward the roller by a biasing member disposed on the opposite side. Item 5. The image forming apparatus according to Item 4.   The image forming apparatus according to claim 5, wherein an adjustment member that adjusts an urging force of the urging member is disposed. (A) having a shaft rotatably disposed in parallel with the first roller;
(B) The image forming apparatus according to claim 1, wherein the pressing member is inclined with respect to the shaft.   The image forming apparatus according to claim 7, wherein the pressing member is rotatably arranged with respect to the shaft.

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