CN-122018267-A - Sheet conveying device and image forming apparatus

Abstract

The invention discloses a sheet conveying device and an image forming apparatus. The sheet conveying apparatus includes a frame, a conveying roller unit including a rotatable rotation shaft, a roller contacting the sheet, and a bearing that electrically conducts and rotatably supports the rotation shaft, and a bearing housing that fixes the conveying roller unit to the frame by being attached to the bearing. In the sheet conveying apparatus, the bearing housing includes a first member made of a non-conductive resin and a second member made of a conductive resin, and the second member contacts the bearing and the frame.

Inventors

• LIN YINGHUI

Assignees

• 佳能株式会社

Dates

Publication Date

20260512

Application Date

20251106

Priority Date

20241108

Claims (14)

1. 1. A sheet conveying apparatus, the sheet conveying apparatus comprising: A frame; A conveying roller unit including a rotatable rotation shaft, a roller contacting the sheet, and a bearing electrically conductive and rotatably supporting the rotation shaft, and A bearing housing that fixes the conveying roller unit to a frame by being attached to the bearing, Wherein the bearing housing includes a first member made of a non-conductive resin and a second member made of a conductive resin, and Wherein the second member contacts the bearing and the frame.
2. 2. The sheet conveying apparatus according to claim 1, Wherein, at the position where the bearings are arranged along the axial direction, A distance from the rotation center of the bearing to the inner diameter portion of the second member contacting the outer diameter portion of the bearing is smaller than a distance from the rotation center of the bearing to the inner diameter portion of the cylindrical portion of the first member, and The distance from the rotation center of the bearing to the outer diameter portion of the second member that is in contact with the frame is greater than the distance from the rotation center of the bearing to the outer diameter portion of the cylindrical portion of the first member.
3. 3. The sheet conveying apparatus according to claim 1, Wherein the ratio of the surface area of the first member to the surface area of the bearing seat is greater than the ratio of the surface area of the second member to the surface area of the bearing seat.
4. 4. The sheet conveying apparatus according to claim 1, Wherein the contact area between the first member of the bearing housing and the bearing is larger than the contact area between the second member of the bearing housing and the bearing.
5. 5. The sheet conveying apparatus according to claim 1, further comprising: a driven roller unit provided at a position facing the conveying roller unit and forming a nip with the conveying roller unit, Wherein the driven roller unit is urged toward the conveying roller unit by a spring.
6. 6. The sheet conveying apparatus according to claim 5, Wherein the second member is disposed on a side opposite to the nip portion with respect to a rotation center of the rotation shaft when viewed from a rotation shaft direction of the conveying roller unit.
7. 7. The sheet conveying apparatus according to claim 6, Wherein the bearing housing comprises a plurality of the second members.
8. 8. The sheet conveying apparatus according to claim 1, Wherein the transfer roller unit includes two bearings respectively provided at both ends of the rotation shaft, Wherein a bearing provided at one of both ends of the rotating shaft has a bearing housing mounted thereon, and Wherein a bearing housing mounted thereon is not provided on a bearing provided at the other of both ends of the rotating shaft.
9. 9. The sheet conveying apparatus according to claim 1, Wherein the bearing housing includes a snap-fit to retain the bearing, and Wherein the first member comprises the snap-fit.
10. 10. The sheet conveying apparatus according to claim 1, Wherein the bearing housing includes a first projection and a second projection projecting in a radial direction of the bearing housing, and the first projection and the second projection are disposed at different positions in an axial direction, and Wherein the position of the conveying roller unit in the axial direction is adjusted by inserting the frame in the axial direction between the first protruding portion and the second protruding portion.
11. 11. The sheet conveying apparatus according to claim 10, Wherein the bearing housing includes a rotation adjusting portion that adjusts rotation of the bearing housing, and Wherein the rotation regulating portion can be fixed at a position reached by rotation from a position where the first protruding portion has been inserted into the opening portion of the frame.
12. 12. The sheet conveying apparatus according to claim 1, Wherein the bearing is press-fitted onto the rotating shaft.
13. 13. An image forming apparatus, the image forming apparatus comprising: the sheet conveying apparatus according to claim 1, and An image forming unit that forms an image on a sheet.
14. 14. A bearing housing, the bearing housing comprising: The first member is made of a non-conductive resin, the second member is made of a conductive resin, Wherein the bearing housing is configured to secure a transfer roller unit to a frame, the transfer roller unit including a rotatable rotating shaft and a bearing that is electrically conductive and rotatably supports the rotating shaft, and Wherein the second member is configured to contact the bearing and the frame.

Description

Sheet conveying device and image forming apparatus Technical Field The present disclosure relates to a technique related to a sheet conveying device that conveys a sheet, and a technique related to an image forming apparatus that forms an image on a sheet. Background Static electricity is generated at the conveying roller of the sheet conveying device due to friction generated by, for example, rotation of the conveying roller. Since the generated static electricity becomes a cause of, for example, machine failure or image defect, in order to eliminate the static electricity, it is necessary to ground the conveying roller. In japanese patent laid-open publication No. 2003-95463, a conveying roller is grounded by bringing a conductive bearing into contact with a grounding metal. Disclosure of Invention When attaching a transfer roller with bearings to a frame, a bearing housing made of a non-conductive resin is sometimes used to attach the transfer roller. In this case, since the transfer roller cannot be grounded, machine failure or image defects caused by static electricity may occur. Accordingly, the present disclosure aims to provide a sheet conveying device and an image forming apparatus, which are capable of reliably grounding a conveying roller to a frame. According to one aspect of the present disclosure, there is provided a sheet conveying apparatus including a frame, a conveying roller unit including a rotatable rotation shaft, a roller contacting a sheet, and a bearing that is electrically conductive and rotatably supports the rotation shaft, and a bearing housing that fixes the conveying roller unit to the frame by being attached to the bearing. In the sheet conveying apparatus, the bearing housing includes a first member made of a non-conductive resin and a second member made of a conductive resin, and the second member contacts the bearing and the frame. Features of the present disclosure will become apparent from the following description of embodiments with reference to the accompanying drawings. The following description of the embodiments is by way of example. Drawings Fig. 1 is a cross-sectional view of an image forming system. Fig. 2 is a perspective view of the transfer unit. Fig. 3 is a cross-sectional view of the transfer unit. Fig. 4 is a perspective view of a transfer roll configuration. Fig. 5 is a schematic view of a bearing housing. Fig. 6A is a cross-sectional view of a bearing housing. Fig. 6B is an enlarged view of the bearing housing. Fig. 6C is an enlarged view of the bearing housing. Fig. 7 is a perspective view of the upper transfer unit. Fig. 8 is an installation explanatory view of one conveying roller. Fig. 9A shows a state before one bearing housing is attached. Fig. 9B shows a state after attaching the bearing housing. Fig. 10A is a schematic view of a support plate with one bearing mount attached. Fig. 10B shows a state in which the bearing housing is inserted into the support plate. Fig. 10C shows a state after the bearing housing is attached to the support plate. Detailed Description The present embodiment is described below with reference to the drawings. It should be noted that since the embodiments described below are preferred embodiments of the present disclosure, various limitations technically preferable are added, however, the scope of the present disclosure should not be unreasonably limited by the following description. Not all structural features described in this embodiment are essential structural requirements of the present disclosure. First embodiment Image forming apparatus with a plurality of image forming units In the present embodiment, the application of the image forming system to the inkjet recording system 1 is described. Fig. 1 is a schematic diagram showing an example of a schematic structure of an inkjet recording system 1. The inkjet recording system 1 is a sheet-type inkjet recording system (sheet-fedinkjet recording system) that produces a recording material that forms an ink image on a sheet by using two liquids (a reaction liquid and an ink). The inkjet recording system 1 of the present embodiment is a combination of an image forming apparatus and a plurality of sheet conveying devices. Devices that are self-supporting due to the chassis (e.g., casters or regulators) and that are self-contained as housings are defined herein as modules and described. The inkjet recording system 1 includes a sheet feeding module 1000, a printing module 2000, a drying module 3000, a fixing module 4000, a cooling module 5000, a reversing module 6000, and a discharge stacking module 7000. The cut paper-like sheet supplied from the sheet feeding module 1000 is conveyed along a conveying path, processed by each module, and discharged to a discharge stacking module 7000 serving as a sheet discharging device. The sheet feeding module 1000 as an example of the sheet feeding apparatus includes memories 1100a, 1100b, and 1100c storing sheets. Memories 1100a, 1100b