Rotary member support structure, transport device, charging device, and image forming apparatus

Abstract

A rotary member support structure includes: a rotary member including a shaft; a bearing that rotatably supports the shaft of the rotary member; a pressing member that presses the bearing in one direction; and a support that supports the bearing such that the bearing is movable in a pressing direction of the pressing member. When the rotary member is not rotating, the bearing and the pressing member are in contact with each other such that the bearing is rotatable about the shaft.

What is claimed is: 
     
         1 . A rotary member support structure comprising:
 a rotary member including a shaft;   a bearing that rotatably supports the shaft of the rotary member;   a pressing member that presses the bearing in one direction; and   a support that supports the bearing such that the bearing is movable in a pressing direction of the pressing member,   wherein, when the rotary member is not rotating, the bearing and the pressing member are in contact with each other such that the bearing is rotatable about the shaft.   
     
     
         2 . A rotary member support structure comprising:
 a rotary member including a shaft;   a bearing that rotatably supports the shaft of the rotary member;   a pressing member that presses the bearing in one direction; and   a support that supports the bearing such that the bearing is movable in a pressing direction of the pressing member,   wherein a first one of the bearing and the pressing member has a protrusion, and a second one of the bearing and the pressing member is in contact with the protrusion,   and wherein, when the rotary member is not rotating, the bearing is rotatable about the shaft.   
     
     
         3 . The rotary member support structure according to  claim 1 , wherein, during rotation of the rotary member, the bearing is maintained in a state in which the bearing is rotatable in a rotation direction of the rotary member. 
     
     
         4 . The rotary member support structure according to  claim 2 , wherein, during rotation of the rotary member, the bearing is maintained in a state in which the bearing is rotatable in a rotation direction of the rotary member. 
     
     
         5 . The rotary member support structure according to  claim 1 , wherein the pressing member is disposed so as to press the bearing toward the rotation center of the shaft of the rotary member. 
     
     
         6 . The rotary member support structure according to  claim 2 , wherein the pressing member is disposed so as to press the bearing toward the rotation center of the shaft of the rotary member. 
     
     
         7 . The rotary member support structure according to  claim 1 , wherein the bearing and the pressing member are in point contact with each other or in line contact with each other along an axial line of the shaft. 
     
     
         8 . The rotary member support structure according to  claim 2 , wherein the protrusion and the second one of the bearing and the pressing member are in point contact with each other or in line contact with each other along an axial line of the shaft. 
     
     
         9 . The rotary member support structure according to  claim 2 , wherein the protrusion is disposed in the pressing member. 
     
     
         10 . The rotary member support structure according to  claim 9 , wherein the pressing member is a coil spring in which a component having the protrusion is attached to one end thereof. 
     
     
         11 . A transport device comprising:
 a pair of transport rotary members that transport a transportation object held therebetween; and   the rotary member support structure according to  claim 1 , the rotary member support structure supporting at least one of the pair of transport rotary members.   
     
     
         12 . A charging device comprising:
 a charging rotary member; and   the rotary member support structure according to  claim 1 , the rotary member support structure supporting the charging rotary member.   
     
     
         13 . An image forming apparatus comprising the rotary member support structure according to  claim 1 . 
     
     
         14 . An image forming apparatus comprising the transport device according to  claim 11 . 
     
     
         15 . An image forming apparatus comprising the charging device according to  claim 12 .