Discharge device and image forming apparatus

Abstract

A discharge device which discharges a sheet includes: a driving shaft which is driven to rotate by a driving source; a plurality of driving rotating members which is provided on the driving shaft; a rotating member which is provided on the driving shaft, has a larger outside diameter than an outside diameter of the driving rotating member, is formed by joining at least two divided components, and includes stepped portions that protrude, to a larger extent, in a radial direction in boundary portions of the at least two components on upstream sides of a rotation direction of the rotating member than on downstream sides thereof; and follower rotating members which are pressed against the driving rotating members.

What is claimed is: 
     
         1 . A discharge device which discharges a sheet, comprising:
 a driving shaft which is driven to rotate by a driving source;   a plurality of driving rotating members which is provided on the driving shaft;   a rotating member which is provided on the driving shaft, has a larger outside diameter than an outside diameter of the driving rotating member, is formed by joining at least two divided components, and includes stepped portions that protrude, to a larger degree, in a radial direction in boundary portions of the at least two components on upstream sides of a rotation direction of the rotating member, than on downstream sides thereof; and   follower rotating members which are pressed against the driving rotating members.   
     
     
         2 . The discharge device according to  claim 1 , wherein the at least two components include flat portions in parts connected to the stepped portions. 
     
     
         3 . The discharge device according to  claim 1 , wherein, in the boundary portions of the at least two components, a distance of one component of the at least two components from a rotation center of the rotating member to an outer circumferential surface in a radial direction of the rotating member is different from a distance of the other component of the at least two components from the rotation center of the rotating member to the outer circumferential surface in the radial direction of the rotating member. 
     
     
         4 . The discharge device according to  claim 1 , wherein
 at least two first protrusions which protrude in the radial direction of the rotating member are provided on both sides of the rotating member on the driving shaft in order to restrict movement of the rotating member in an axial direction,   protruding amounts of the first protrusions are different between both sides of the rotating member,   a second protrusion which protrudes in the axial direction is provided on at least one side surface of the rotating member in the axial direction, and   the first protrusions provided on the driving shaft and the second protrusion provided in the rotating member are configured to interfere with each other when trying to assemble the stepped portions to protrude on the downstream side in the rotation direction of the rotating member.   
     
     
         5 . The discharge device according to  claim 1 , wherein locking portions are provided, in the vicinity of respective boundary portions of the at least two components of the rotating member, so as to be detachably attachable to each other. 
     
     
         6 . An image forming apparatus, comprising:
 an image forming section which forms an image on a sheet; and   the discharge device according to  claim 1 , which discharges the sheet, on which the image is formed by the image forming section, to the outside of the apparatus.