Patent ID: 8270877

Claim:
An image forming apparatus comprising: an apparatus main body; a moving member that is movable between an accommodation position in the apparatus main body and a separation position out of the apparatus main body; a main body driving member that is rotatably provided in the apparatus main body and to which a driving force of a driving source is transmitted; a passive member that is rotatably provided in the moving member and is opposed to the main body driving member in a rotation axis direction of the main body driving member when the moving member is positioned at the accommodation position; and a driving force transmitting member that is provided between the main body driving member and the passive member, the driving force transmitting member configured to transmit the driving force from the main body driving member to the passive member by engaging with the main body driving member and the passive member in the rotation direction, wherein the driving force transmitting member is movably supported in the main body driving member along the rotation axis direction so as to switch a connection or disconnection of the driving force transmitting member and the passive member, wherein a first connecting unit, by which the main body driving member engages with the driving force transmitting member in the rotation direction, is engaged with the main body driving member and the driving force transmitting member by an unevenness so as to be movable in a first diameter direction perpendicular to the rotation axis direction, and wherein a second connecting unit, by which the driving force transmitting member engages with the passive member in the rotation direction, is engaged with the driving force transmitting member and the passive member by an unevenness so as to be movable in a second diameter direction perpendicular to the rotation axis direction and the first diameter direction.