| 主权项 |
1. An image forming apparatus, comprising:
a detachably supported rotary member; a drive source configured to generate a torque for rotating the rotary member; and a torque transmission mechanism configured to transmit the torque generated by the drive source to the rotary member, wherein the torque transmission mechanism includes a driving member connected to the drive source, a joint member configured to rotate together with the driving member and configured to be connected to the rotary member by moving in an axial direction of a rotation shaft of the driving member, a biasing member configured to bias the joint member in the axial direction of the rotation shaft, a cam member provided with a cam for pressing the joint member in the axial direction of the rotation shaft and supported so as to rotate about the rotation shaft, and a bush provided with an engagement surface with which the cam of the cam member engages, and fitted to the cam member, the torque transmission mechanism is configured to rotate the cam member and to move the cam member along the bush in the axial direction of the rotation shaft such that the joint member is moved in the axial direction of the rotation shaft between an advanced position where the joint member is connected to the rotary member to transmit the torque of the drive source to the rotary member and a retracted position where the joint member is spaced apart from the rotary member to release transmission of the torque of the drive source to the rotary member, and a rib to which the bush is fitted is formed on an end surface of the cam member existing at a side at which the cam member is fitted to the bush. |
