JP2006193263A - Roll unit and conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll unit having a roll body with the direction of one end side thereof being determined in a predetermined direction capable of checking at a glance that the roll body is attached in the opposite direction. <P>SOLUTION: The roll unit comprises a first rotary shaft 5822 protruded from one end of a roll body 5821 with the direction of one end side thereof being determined in the predetermined direction, a second rotary shaft 5823 protruded from the other end of the one end of the roll body 5821 with the protrusion smaller than that of the first rotary shaft 5822, and an interference member 5839 which is provided between the first position of an edge 5823e of the second rotary shaft 5823 protruded from the roll body 5821 with the one end side thereof being directed in the predetermined direction and the second position separate in the protruding direction of the second rotary shaft 5823 from the first position by the differential distance in protrusion between the first rotary shaft 5822 and the second rotary shaft 5823, and interferes the first rotary shaft 5822 when the roll body 5821 is arranged with the one end side thereof being directed to the direction opposite to the predetermined direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roll unit having a roll body in which a direction in which one end side faces is determined in a predetermined direction, and a transport device that is provided with the roll unit and transports a sheet-like recording medium.

2. Description of the Related Art Conventionally, there has been known a roll unit having a roll in which a direction toward one end side is determined in a predetermined direction (for example, see Patent Document 1). Here, the roll unit described in Patent Document 1 will be described as an example. The roll unit described in Patent Document 1 is employed in a paper discharge mechanism of an image forming apparatus that forms a full-color image by superimposing four color images on paper. The image forming apparatus described in Patent Document 1 is provided with a stacking tray for stacking a large amount of sheets on which image formation has been performed, and the paper discharge mechanism is forward and reverse to discharge the sheets onto the stacking tray. A rotatable paper discharge roll is provided. In this image forming apparatus, the apparatus is miniaturized. When one color image formation is completed, the sheet is once sent to the sheet discharge mechanism, and after the sheet discharge roll rotates forward, the sheet is discharged to pull back the sheet. The roll reversely rotates to form the second color image, and thereafter the forward and reverse rotation of the paper discharge roll is repeated until the fourth color image formation is completed. The paper on which the fourth color image has been formed is discharged onto the stacking tray as the paper discharge roll continues to rotate forward. When the paper discharge roll rotates in a state where a large amount of sheets are stacked on the stacking tray, the topmost sheet on the stacking tray may be drawn. On the other hand, when the paper discharge roll is rotated forward to discharge the paper onto the stacking tray, it is desired that the paper is reliably discharged onto the stacking tray. Therefore, the roll unit of the paper discharge mechanism described in Patent Document 1 uses a paper discharge roll having a paddle member. The paddle member has a shape in which a plurality of paddles extending in the radial direction of the paper discharge roll are inclined in the rotation direction of the paper discharge roll. When the paper discharge roll is rotating forward, the paddle is inclined downstream in the rotation direction. As a result, the ejected paper is struck out vigorously at the tip of the paddle, and the paper is ejected onto the stacking tray. On the other hand, when the paper discharge roll is rotating in the reverse direction, the paddle is inclined upstream in the rotation direction. When the paddle comes into contact with the paper on the stacking tray, the paddle is bent and the paper is prevented from being pulled in. Therefore, in the paper discharge roll having the paddle member, the paddle is inclined to the downstream side in the rotation direction when the paper discharge roll rotates in the forward direction, and the paddle rotates when the paper discharge roll rotates in the reverse direction. It must be arranged so that it is tilted upstream in the direction. In order to arrange in this way, it is necessary to determine the direction in which one end side of the paper discharge roll faces in a predetermined direction. If the paper discharge roll is installed in the reverse direction by mistake, there is a risk that it will have a completely opposite effect. is there.
Japanese Patent Laid-Open No. 11-334963

  However, the paper discharge roll is small. In particular, if the shape of the paper discharge roll is symmetrical, it is difficult to determine the mounting direction of the paper discharge roll at a glance. Even if it is installed in the opposite direction, it may not be noticed. In addition, even if a paper discharge test is performed in the shipping inspection, the paper discharge test only discharges a few sheets of paper. It may pass.

  The present invention solves the above-mentioned problems, and a roll unit that is devised at a glance when a roll body in which the direction toward one end is set in a predetermined direction is attached in the reverse direction, and the roll unit are provided. Another object of the present invention is to provide a transport device that transports a sheet-like recording medium.

The roll unit of the present invention that solves the above-mentioned object is a roll body in which a direction in which one end side faces is determined in a predetermined direction,
A first rotating shaft protruding from one end of the roll body;
A second rotating shaft protruding from the other end of the roll body with respect to the one end with a protruding amount smaller than a protruding amount of the first rotating shaft;
A bearing that rotatably supports each of the first rotating shaft and the second rotating shaft; and a position of an edge of the second rotating shaft that protrudes from the roll body in which the one end side is disposed facing the predetermined direction; The roll body is provided between the first rotary shaft and a position separated from the position in the protruding direction of the second rotary shaft by a distance corresponding to the difference in protrusion amount between the first rotary shaft and the second rotary shaft. An interference member that interferes with the first rotation shaft when disposed in a direction opposite to the predetermined direction is provided.

  According to the roll unit of the present invention, when the roll body is arranged with the one end side directed in a predetermined direction, the second rotating shaft is not disturbed by the interference member, but the roll body is reversed. If the first rotating shaft is obstructed by the interference member and the roll body cannot be arranged or can be arranged when the arrangement is made in the direction, the arrangement position or posture of the roll body or the bearing It can be seen at a glance that the roll body is disturbed and the roll body is attached in the opposite direction.

Here, in the roll unit according to the present invention, the bearing is configured such that the first rotating shaft projecting from the roll body arranged with the one end side facing the predetermined direction passes therethrough and rotatably supports the first rotating shaft. A cylindrical first bearing portion and a second bearing that is longer than the first bearing portion into which the second rotating shaft is inserted and rotatably supports the inserted second rotating shaft. And having a part,
The interference member may be provided on the downstream side of the second bearing portion in the insertion direction of the second rotation shaft.

The conveying device of the present invention that solves the above object includes a rotating discharge roll and a rotatable counter roll that contacts the discharge roll to form a nip portion, and is a sheet-like recording sent from the upstream side. In the conveyance device that conveys the medium to the downstream side by sandwiching the medium in the nip portion by rotating the discharge roll,
The opposing roll is
A roll body in which the direction in which one end side faces is determined in a predetermined direction,
A first rotating shaft projecting from one end of the roll body, and a second rotating shaft projecting from the other end of the roll body with respect to the one end with a projecting amount smaller than the projecting amount of the first rotating shaft. ,
Furthermore, this transport device
A bearing that rotatably supports each of the first rotating shaft and the second rotating shaft, and a position of an edge of the second rotating shaft protruding from the roll body in which the one end side is disposed facing the predetermined direction; The roll body is provided between the first rotary shaft and a position separated from the position in the protruding direction of the second rotary shaft by a distance corresponding to the difference in protrusion amount between the first rotary shaft and the second rotary shaft. An interference member that interferes with the first rotation shaft when disposed in a direction opposite to the predetermined direction is provided.

  Further, in the transport device according to the present invention, the bearing has a spring portion that applies a pressing force that presses the peripheral surface of the roll body against the peripheral surface of the discharge roll on each of the first rotating shaft and the second rotating shaft. It is preferable.

  Since the bearing has the spring portion, the sheet-like recording medium sent from the upstream side can be reliably sandwiched by the nip portion, and the recording medium can be reliably conveyed.

  According to the present invention, a roll unit that has been devised at a glance when a roll body in which the direction toward the one end side is set in a predetermined direction is attached in the reverse direction, and the roll unit are provided, and a sheet-shaped roll unit is provided. A conveyance device that conveys a recording medium can be provided.

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

  FIG. 1 is a schematic cross-sectional configuration diagram of an image forming apparatus in which a paper discharge device which is an embodiment of a conveying device of the present invention is incorporated.

  The image forming apparatus shown in FIG. 1 is a four-cycle full-color printer that employs a so-called electrophotographic method. In other words, the image forming apparatus includes a toner image carried on an image carrier carrying a toner image inside a main body, and finally transferring and fixing the toner image onto a sheet-like recording medium to fix the toner image on the recording medium. Then, the recording medium on which the image is formed is discharged outside the main body.

  As shown in FIG. 1, this image forming apparatus has a photosensitive drum 12 as an image bearing member rotatably disposed at an upper right portion slightly from the center in the figure inside the main body 10. The photosensitive drum 12 is composed of, for example, a conductive cylinder having a diameter of about 47 mm and having a surface coated with a photosensitive layer made of OPC or the like. To do. The surface of the photosensitive drum 12 is charged to a predetermined potential by rolling contact with a charging roll 14 as a charging unit. After that, image exposure with a laser beam (LB) is performed by ROS16 (Raster Output Scanner) as exposure means arranged at a position just below the photosensitive drum 12, and an electrostatic latent image corresponding to the image information is generated. It is formed.

  The electrostatic latent image formed on the surface of the photoconductor drum 12 passes through the developing devices 15Y, 15M, 15C, and 15K for each color of yellow (Y), magenta (M>), cyan (C), and black (K). The toner image is developed by a rotary developing device 15 arranged along the direction and becomes a toner image of a predetermined color, and at this time, the surface of the photosensitive drum 12 is charged, exposed, and developed according to the color of the image to be formed. These steps are repeated a predetermined number of times.

  The rotary developing device 15 is driven to rotate in the direction of arrow A at a predetermined timing, and the developing devices 15Y, 15M, 15C, and 15K corresponding to the color to be developed move to the developing position facing the photosensitive drum 12. . For example, in the case of forming a full-color image, the charging, exposure, and development processes on the surface of the photosensitive drum 12 are yellow (Y), magenta (M), cyan (C), and black (K). Repeated four times for each color. A toner image corresponding to each color of yellow (Y), magenta (M), cyan (C), and black (K) is sequentially formed on the surface of the photosensitive drum 12.

  The number of rotations of the photosensitive drum 12 when a toner image is formed in this manner varies depending on the size of the image. For example, in the case of an A4 size, the photosensitive drum 12 is used to form a single color image. Rotates 3 times. In other words, each time the photosensitive drum 12 rotates three times, toner images corresponding to yellow (Y), magenta (M), cyan (C), and black (K) colors are sequentially formed on the surface of the photosensitive drum 12. It is formed. The toner images sequentially formed on the photosensitive drum 12 are primarily transferred in a state where they are superimposed on the intermediate transfer belt 18 when passing through the primary transfer position.

  The yellow (Y), magenta (M), cyan (C), and black (K) toner images sequentially formed on the photosensitive drum 12 are belt-shaped image carriers on the outer periphery of the photosensitive drum 12. At the primary transfer position where the intermediate transfer belt 18 as an (intermediate transfer member) is wound, primary transfer is performed by the primary transfer roll 20 while being superimposed on the intermediate transfer belt 18. On the intermediate transfer belt 18, the intermediate transfer belt 18 is superimposed. The multiple transferred yellow (Y), magenta (M), cyan (C), and black (K) toner images are recorded on a recording sheet as a recording medium fed by the secondary transfer roll 22 at a predetermined timing. Secondary transfer is performed on 24 at once.

  The secondary transfer roll 22 is rotationally driven via a gear from a driving source (not shown). The recording paper 24 is fed from a paper feeding unit 26 disposed at the lower part of the main body 10 by a pick-up roll 28 and fed one by one by a feed roll 30 and a retard roll 32. The roller 34 is conveyed to the secondary transfer position of the intermediate transfer belt 18 in synchronization with the toner image transferred onto the intermediate transfer belt 18. The secondary transfer roll 22 is configured to come in contact with and separate from the surface of the intermediate transfer belt 18 at a predetermined timing.

  The intermediate transfer belt 18 is stretched by a plurality of rolls, and is configured to rotate at a predetermined process speed (about 150 mm / sec) synchronized with the rotation of the photosensitive drum 12. That is, the intermediate transfer belt 18 includes a wrap-in roll 36 that specifies the wrap position of the intermediate transfer belt 18 on the upstream side in the rotation direction of the photosensitive drum 12 and a toner image formed on the photosensitive drum 12. The primary transfer roll 20 to be transferred onto the intermediate transfer belt 18, the wrapped roll 38 for specifying the wrap position of the intermediate transfer belt 18 on the downstream side of the wrap position, and the secondary transfer roll 22 through the intermediate transfer belt 18. It is stretched at a predetermined tension by a backup roll 40 in contact therewith, a first cleaning backup roll 44 facing the cleaning device 42 of the intermediate transfer belt 18, and a second cleaning backup roll 46.

  Further, in the main body 10, in order to improve the maintainability of the intermediate transfer belt 18 and the rotary developing device 15 that occupies a large space while achieving the downsizing of the apparatus, the intermediate transfer belt 18 includes a photosensitive drum. 12, the charging roll 14, and the secondary transfer roll 22, the image forming unit 48 is integrally configured. By opening the upper cover portion of the main body 10, the entire image forming unit 48 is entirely attached to the main body 10. The image forming unit 48 is configured to be detachable so that it can be taken out to the outside.

  Further, the cleaning device 42 for the intermediate transfer belt 18 includes a scraper and a cleaning brush (not shown) that are mounted so as to be slidable from the separated position to the surface of the intermediate transfer belt 18 at a necessary timing. Prepare. Residual toner and paper dust removed by these scrapers and cleaning brushes are collected inside the cleaning device 42.

  In this image forming apparatus, the surface of the photosensitive drum 12 after the toner image transfer process is completed is disposed at a position obliquely below the photosensitive drum 12 every time the photosensitive drum 12 rotates once. Residual toner and the like are removed by the cleaning blade of the apparatus 35 so as to prepare for the next image forming process.

  The recording paper 24 onto which the toner image has been transferred from the intermediate transfer belt 18 as described above is conveyed to the fixing device 50 and pressed under heat to fix the toner image on the recording paper 24.

  The fixing device 50 is configured as a so-called free belt nip fuser (free belt nip fuser) system, and a heat roll 52 as a rotating member that is rotationally driven, and the heat roll 52 press-contacts via a fixing belt 54. A main part is constituted by a pressure pad 56 which is a pressure member to be formed. Inside the heat roll 52, a halogen lamp is disposed as a heat source. A temperature sensor (not shown) is brought into contact with the surface of the heat roll 52, and the control unit of the image forming apparatus controls lighting of the halogen lamp based on a temperature measurement value by the temperature sensor. Is adjusted so as to maintain the set temperature (for example, 170 ° C.). The fixing belt 54 is configured as an endless belt (endless belt) that rotates in a synchronized manner while being pressed against the heat roll 52, and is formed in an endless track shape (cylindrical shape of a predetermined length). The pressure pad 56 is inside the fixing belt 54, presses the heat roll 52 with a predetermined pressure distribution via the fixing belt 54, and forms a nip region with the heat roll 52. Further, the fixing device 50 is provided with a paper discharge device 58 which is an embodiment of the transport device of the present invention. The paper discharge device 58 includes a rotating discharge roll 581 and a rotatable kick roll 582 that contacts the discharge roll 581 and forms a nip portion, and receives the recording paper 24 sent from the heat roll 52 side. When the discharge roll 581 rotates, the discharge roll 581 is sandwiched in the nip portion and discharged onto the stacking tray 80. That is, in the image forming apparatus shown in FIG. 1, the recording paper discharge portion of the fixing device 50 becomes the recording paper discharge portion of the main body 10, and the apparatus is miniaturized. A detailed description of the paper discharge device 58 will be given later. The stacking tray 80 can stack a large amount of recording sheets.

  Next, a basic image forming process of the image forming apparatus shown in FIG. 1 will be described. In this image forming apparatus, image data output from an image reading device (IIT) (not shown) or a personal computer (PC) (not shown) is subjected to predetermined image processing by an image processing device (IPS) (not shown). An image forming operation is executed by the developing device 15 (15Y, 15M, 15C, 15K) In the image processing device (IPS), shading correction, positional deviation correction, brightness / Predetermined image processing such as color space conversion, gamma correction, frame erasing, color editing, moving editing, etc. is performed, and the image data subjected to the image processing is converted into four image data Y, M, C, and K. The color is converted into color material gradation data and output to the ROS 16 which is a laser exposure device.

  The ROS 16 irradiates the photosensitive drum 12 of the developing device 15 with, for example, a laser beam LB emitted from a semiconductor laser in accordance with the input color material gradation data. In the developing device 15, after the surface is charged by the belt demand roll 14, the surface is scanned and exposed by the ROS 16 to form an electrostatic latent image.

  The electrostatic latent image formed on the surface of the photoconductive drum 12 passes through the developing devices 15Y, 15M, 15C, and 15K for each color of yellow (Y), magenta (M), cyan (C), and black (K). The toner is developed by a rotary developing device 15 arranged along the direction, and toner images corresponding to the respective colors of yellow (Y), magenta (M), cyan (C), and black (K) are sequentially formed. The toner images sequentially formed on the photosensitive drum 12 are primarily transferred in a state where they are superimposed on the intermediate transfer belt 18 when passing through the primary transfer position.

  The yellow (Y), magenta (M>), cyan (C), and black (K) toner images transferred in a multiple manner onto the intermediate transfer belt 18 are recorded as recording media by the secondary transfer roll 22. Secondary transfer is performed collectively on the paper 24.

  The recording paper 24 onto which the toner image has been transferred from the intermediate transfer belt 18 in this way is carried into the fixing device 50.

  In the fixing device 50, the heat roll 52 is rotated in the direction of arrow B by a drive motor (not shown), and the fixing belt 54 is also driven to rotate by this rotation. 52 and the pressure pad 56 are carried into the nip region. Then, when the recording paper 24 passes through the nip region, the toner image on the recording paper 24 is fixed by the pressure acting on the nip region and the heat supplied from the heat roll 52, and sent to the paper discharge device 58. . The paper discharge device 58 discharges the fed paper onto the stacking tray 80. When the recording sheets are sequentially discharged onto the stacking tray 80 in this way, the recording sheets are stacked and stacked on the stacking tray 80.

  Next, the paper discharge device 58 provided in the fixing device 50 will be described in detail.

  FIG. 2 is a perspective view of the fixing device shown in FIG. 1 as viewed from the side where the paper discharge device is provided.

  A sheet discharge device 58 is disposed downstream of the fixing device 50 shown in FIG. In the portion of the fixing device 50 where the paper discharge device 58 is provided, the conveyance of the paper is guided in the width direction intersecting the conveyance direction of the recording paper sent from the heat roll side (not shown in FIG. 2). A plurality of guide ribs 55 are provided.

  The paper discharge device 58 shown in FIG. 2 includes a single discharge roll 581 that extends in the width direction of the recording paper. The discharge roll 581 is rotated in a predetermined direction by a motor (not shown) arranged at the left end portion of the paper discharge device 58 shown in FIG. 2, and the discharge roll 581 includes a central portion and a total of three places on both sides thereof. The rubber roll body 5811 is provided on both sides of the rubber roll body 5811, and the protrusions 5812 that protrude in the circumferential direction of the discharge roll 581 are provided on both sides of each rubber roll body 5811. Further, the sheet discharge device 58 shown in FIG. 2 includes a rotatable kick roll 582 that contacts a rubber roll body 5811 at the center portion to form a nip portion, and also contacts each protrusion 5812 to remove the nip portion. A rotatable pinch roll 583 is also provided. The kick roll 582 and each pinch roll 583 rotate in accordance with the rotation of the discharge roll 581, and each of the rolls 582 and 583 is a constituent element of the roll unit. A roll unit 580 having the kick roll 582 as one constituent element corresponds to an embodiment of the roll unit of the present invention, and the kick roll 582 corresponds to an example of an opposing roll according to the present invention.

  3 is a side view of the kick roll and the discharge roll shown in FIG. 2 viewed from one end side of the kick roll, and FIG. 4 is a perspective view of the kick roll shown in FIG.

  The kick roll 582 includes a roll body 5821 whose direction toward one end is set to a predetermined direction, a first rotating shaft 5822 protruding from one end of the roll body 5821, and one end of the roll body 5821 as shown in FIG. The second rotating shaft 5823 protruded from the other end with a protruding amount smaller than the protruding amount of the first rotating shaft 5822. At both ends of the roll body 5821, gear-like kick members 59 are provided. The kick member 59 has eight teeth 591 arranged at intervals of 45 degrees in the circumferential direction of the roll body 5821. The kick roll 582 shown in FIG. 3 rotates counterclockwise (see the arrow in FIG. 3) as the discharge roll 581 rotates, and these eight teeth 591 are all in the rotational direction of the kick roll 582. The shape is inclined to the downstream side. Further, of the eight teeth 591, only two predetermined teeth 591 a facing each other by 180 degrees protrude from the peripheral surface of the roll body 5821 in the radial direction of the roll body 5821. FIG. 3 shows a nip portion N formed by contacting the roll body 5821 of the kick roll 582 with a rubber roll body 5811 provided in the center of the discharge roll 581. It is sent to part N. The leading edge of the recording paper that has reached the nip portion N is sandwiched by the nip portion N as the discharge roll 581 rotates, and the recording paper is discharged onto a stacking tray 80 (not shown) (see FIG. 1). At this time, if the trailing edge of the recording sheet does not fall on the stacking tray 80 and remains in the vicinity of the nip portion N, the remaining trailing edge of the recording sheet is pushed by the leading edge of the recording sheet to be discharged next and remains. In some cases, the recording paper that has been discharged may protrude from the stacking tray 80 without being discharged onto the stacking tray 80. In this paper discharge device 58, the trailing edge of the recording paper to be discharged protrudes from the kick member 59. The two teeth 591a are pushed out toward the stacking tray 80, and the trailing edge of the recording paper is surely dropped onto the stacking tray 80. For this reason, the storage capacity of the recording paper in the stacking tray 80 is improved. When the kick roll 582 exhibiting such an effect is rotated in the direction of the arrow shown in FIG. 3, the two teeth 591 a of the kick member 59 are inclined to the downstream side in the rotation direction of the kick roll 582. Here, the relatively short second rotating shaft 5823 is connected to a motor (not shown) that drives a discharge roll 581 provided at the left end portion of the paper discharge device 58 shown in FIG. It is necessary to attach the kick roll 582 so that it faces. That is, the roll body 5821 of the kick roll 582 needs to be arranged so that the side from which the second rotation shaft protrudes faces the motor side.

  Note that FIG. 3 shows a plurality of guide ribs 55.

  In addition, the roll unit including the kick roll 582 as one constituent element includes a bearing that rotatably supports the long first rotating shaft 5822 and the short second rotating shaft 5823 as another constituent element. .

  FIG. 5 is a perspective view showing a bearing which is another component of a roll unit including a kick roll as one component.

  A bearing 583 shown in FIG. 5 is a torsion coil spring formed by bending a wire, and includes a relatively short cylindrical first bearing portion 5831 and a relatively long cylindrical second bearing portion 5832. FIG. 5A is a perspective view of the bearing 583 viewed from the second bearing portion 5832 side, and FIG. 5B is a perspective view of the bearing 583 viewed from the first bearing portion 5831 side. . The first bearing portion 5831 and the second bearing portion 5832 are portions formed by winding processing.

  The bearing 583 also has a mounting portion 5833 and a spring portion 5834. The spring portion 5834 is a portion that connects the attachment portion 5833 to each of the first bearing portion 5831 and the second bearing portion 5832.

  The bearing 583 shown in FIG. 5 has a relatively long second bearing portion 5832 that drives the discharge roll 581 to the frame of the fixing device 50 by the mounting portion 5833 before the assembly of the entire fixing device 50 is completed. It is attached to come to the motor side. This bearing 583 is asymmetrical because the lengths of the first bearing portion 5831 and the second bearing portion 5832 are different, and prevents the left and right sides from being reversed when the fixing device 50 is attached to the frame. Has been.

  When the bearing shown in FIG. 5 is attached to the frame of the fixing device 50, the kick roll 582 shown in FIG. 4 is now attached. The kick roll 582 is also attached before the assembly of the entire fixing device 50 is completed. The kick roll 582 needs to be attached so that the relatively short second rotation shaft 5823 faces the motor (not shown) that drives the discharge roll 581 as described above, and the second rotation shaft 5823 is attached to the motor side. It is inserted into a certain second bearing portion 5832. Comparing the length of the second rotating shaft 5823 and the length of the second bearing portion 5832, the length of the second bearing portion 5832 is longer, and the edge of the second rotating shaft 5823 is within the second bearing portion 5832. Will be located. As shown in FIG. 5A, the interference portion 5839 is formed by bending the second bearing portion 5832 shown on the near side at the downstream end in the insertion direction of the second rotating shaft 5823 so as to close the opening 5832a. Is provided. The second bearing portion 5832 is longer than the first rotation shaft 5822 and shorter than the second rotation shaft 5823. The interfering portion 5839 shown in FIG. 5 includes the position of the edge of the second rotating shaft 5823 inserted into the second bearing portion 5832 in the second bearing portion 5832, the first rotating shaft 5822, and the second rotating shaft 5823. And a position away from the position in the projecting direction (insertion direction) of the second rotating shaft 5823 by a distance corresponding to the difference in projecting amount. In addition, it is easy to provide the interference part 5839 as shown in FIG. 5A in the bearing 583 formed by the bending process by adding only one bending process. 5839 may be omitted, and an interference portion may be provided in the frame of the fixing device 50 so as to be positioned between the above.

  FIG. 6 is a view showing the kick roll attached to the bearing before the assembly of the entire fixing device is completed.

  In FIG. 6, the right side of the drawing is the motor side that drives the discharge roll 581, and in FIG. 6A, the second rotating shaft 5823 is inserted into the second bearing portion 5832 on the motor side, and the opposite side. A state in which the first rotating shaft 5822 is inserted into the first bearing portion 5831 on the side is shown. Comparing the length of the first rotating shaft 5822 and the length of the first bearing portion 5831, the length of the first rotating shaft 5822 is longer, and the first rotating shaft 5822 penetrates the first bearing portion 5831. . Further, the end edge 5823e of the second rotation shaft 5823 is located at a position away from the interference part 5839 and does not interfere with the interference part 5839.

  The protruding two teeth 591a provided on the kick member 59 of the kick roll 582 shown in FIG. 6A are downstream of the kick roll 582 in the rotation direction when the kick roll 582 rotates in the arrow direction shown in FIG. It is inclined to the side, and the attachment state of the kick roll 582 shown in FIG. 6A is a normal attachment state. When the kick roll 582 is attached in this regular attachment state, the entire bearing 583 maintains a proper posture without the spring portion 5834 being twisted.

  On the other hand, FIG. 6B shows a kick roll 582 attached to the opposite side of the kick roll 582 shown in FIG. 6A, and the first bearing 5832 on the right side (motor side) The state where the rotating shaft 5822 is inserted and the second rotating shaft 5823 is inserted into the first bearing portion 5831 on the opposite side is shown. The two teeth 591a of the kick roll 582 shown in FIG. 6B are inclined to the upstream side in the rotation direction of the kick roll 582 when the kick roll 582 rotates in the arrow direction shown in FIG. In the kick roll 582 shown in FIG. 6B, the effect of providing the kick member 59 is not exhibited. The interference part 5839 provided on the second bearing part 5832 shown on the right side of FIG. 6 abuts the end edge 5822e of the first rotation shaft 5822, and the interference part 5839 has the first rotation shaft 5822 connected to the second bearing part 5832. Prevents penetration. That is, the edge 5822e of the first rotation shaft 5822 interferes with the interference portion 5839, and the spring portion 5834 shown on the right side of the drawing is greatly distorted due to this interference, and the entire bearing 583 is greatly distorted. . For this reason, the mounting operator can determine at a glance whether or not the mounting state of the kick roll 582 is a normal mounting state by looking at the attitude of the bearing 583 as a whole.

  FIG. 7 is a view showing the kick roll attached to the bearing after the assembly of the entire fixing device is completed.

  In FIG. 7, contrary to FIG. 6, the left side of the figure is the motor side that drives the discharge roll 581, and FIG. 7A is attached in the normal attachment state shown in FIG. A kick roll 582 is shown. A spring portion 5834 (not shown) provided on the bearing 583 (see FIG. 5 and FIG. 6) is supported by a first rotating shaft 5822 and a second bearing portion 5832 that are supported by the first bearing portion 5831. A pressing force that presses the circumferential surface of the roll body 5821 of the kick roll 582 against the circumferential surface of the rubber roll body 5811 of the discharge roll 581 is applied to each of the second rotation shafts 5823 using spring properties. Accordingly, the roll body 5821 of the kick roll 582 shown in FIG. 7A is in pressure contact with the peripheral surface of the rubber roll body 5811 of the discharge roll 581 by the action of the spring portion 5834, and the fed recording paper is fed to the nip portion N. Therefore, the recording paper can be reliably fed and the recording paper can be reliably fed out.

  Further, FIG. 7 shows two guide ribs 55 located on both sides of the kick roll 582 among the plurality of guide ribs 55 provided in the fixing device 50, and is shown in FIG. The kick roll 582 is located between the two guide ribs 55.

  On the other hand, FIG. 7B shows a kick roll 582 shown in FIG. 6B, which is attached in a so-called reverse direction and in which the edge 5822e of the first rotation shaft 5822 interferes with the interference portion 5839. Yes. The kick member 59 on the first rotation shaft 5822 side of the roll body 5821 shown in FIG. 7B rides on the right guide rib 55 shown in FIG. 7B, and the kick roll 582 is disposed obliquely. Yes. For this reason, the peripheral surface of this roll body 5821 is only in contact with the peripheral surface of the rubber roll body 5811, and the recording paper that has been sent is the roll body 5821 of the kick roll 582 and the rubber roll body 5811 of the discharge roll 581. In this case, the recording paper is not properly pinched and a recording paper discharge failure or a jam always occurs. For this reason, even if the reverse installation of the kick roll 582 is overlooked and the assembly of the entire fixing device is completed, a recording paper discharge failure or jam occurs in several paper discharge tests in the shipping inspection. Notice the reverse.

  As described above, in the roll unit 580 having the kick roll 582 as a constituent element, a device that can be seen at a glance when the roll body 5821 of the kick roll 582 is attached in the opposite direction is made. The roll unit of the present invention is not limited to the paper discharge device 58 but can be used by being incorporated into various machine elements.

1 is a schematic cross-sectional configuration diagram of an image forming apparatus in which a paper discharge device that is an embodiment of a conveyance device of the present invention is incorporated. FIG. 2 is a perspective view of the fixing device shown in FIG. 1 as viewed from the side where a paper discharge device is provided. It is the side view which looked at the kick roll and discharge roll which are shown in FIG. 2 from the one end side of a kick roll. It is a perspective view of the kick roll shown in FIG. It is a perspective view which shows the bearing which is another component of the roll unit which uses a kick roll as one component. FIG. 4 is a diagram illustrating a kick roll attached to a bearing before the assembly of the entire fixing device is completed. It is a figure which shows the kick roll attached to the bearing after the assembly of the whole fixing device was completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body 50 Fixing apparatus 58 Paper discharge apparatus 580 Roll unit 581 Discharge roll 5811 Rubber roll body 582 Kick roll 5821 Roll body 5822 1st rotating shaft 5823 2nd rotating shaft 59 Kick member 591,591a Teeth 583 Bearing 5831 1st bearing part 5832 1st 2-bearing part 5834 Spring part 5839 Interference part N Nip part

Claims (4)

A roll body in which the direction in which one end side faces is determined in a predetermined direction,
A first rotating shaft protruding from one end of the roll body;
A second rotating shaft protruding from the other end of the roll body with respect to the one end with a protruding amount smaller than a protruding amount of the first rotating shaft;
A bearing that rotatably supports each of the first rotating shaft and the second rotating shaft; and a position of an edge of the second rotating shaft protruding from the roll body in which the one end side faces the predetermined direction; The roll body is provided between the first rotating shaft and the second rotating shaft in a protruding direction of the second rotating shaft by a distance corresponding to the difference in protruding amount between the first rotating shaft and the second rotating shaft. A roll unit comprising: an interference member that interferes with the first rotation shaft when arranged in a direction opposite to the predetermined direction. The bearing has a cylindrical first bearing portion that passes through the first rotating shaft that protrudes from the roll body, the one end side of which is arranged in the predetermined direction, and rotatably supports the first rotating shaft; A cylindrical member that is longer than the first bearing portion into which the second rotating shaft is inserted and has a second bearing portion that rotatably supports the inserted second rotating shaft;
2. The roll unit according to claim 1, wherein the interference member is provided on a downstream end side of the second bearing portion in the insertion direction of the second rotating shaft. A rotating discharge roll; and a rotatable opposing roll that contacts the discharge roll to form a nip portion. The sheet-shaped recording medium fed from the upstream side rotates the discharge nip to rotate the nip. In the conveying device that is sandwiched between the parts and conveyed downstream,
The opposing roll is
A roll body in which the direction in which one end side faces is determined in a predetermined direction,
A first rotating shaft projecting from one end of the roll body, and a second rotating shaft projecting from the other end of the roll body with respect to the one end with a projecting amount smaller than the projecting amount of the first rotating shaft. ,
Furthermore, this transport device
A bearing that rotatably supports each of the first rotating shaft and the second rotating shaft; and a position of an edge of the second rotating shaft protruding from the roll body in which the one end side faces the predetermined direction; The roll body is provided between the first rotating shaft and the second rotating shaft in a protruding direction of the second rotating shaft by a distance corresponding to the difference in protruding amount between the first rotating shaft and the second rotating shaft. A conveying apparatus comprising: an interference member that interferes with the first rotation shaft when arranged in a direction opposite to the predetermined direction.   The bearing includes a spring portion that applies a pressing force that presses the circumferential surface of the roll body against the circumferential surface of the discharge roll on each of the first rotating shaft and the second rotating shaft. Item 4. The transfer device according to Item 3.

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