Patent ID: 8805243

Claim:
An image forming apparatus comprising: a driving source configured to generate power; a first rotator configured to be drivingly rotated by the power generated by the driving source; a first power transmission system configured to transmit the power from the driving source to the first rotator; at least one second rotator further downstream than the first rotator in a flow of power transmission; a second power transmission system configured to transmit the power from at least one of the first power transmission system and the first rotator to the at least one second rotator; and a damper configured to attenuate oscillation between the first power transmission system and the second power transmission system or between the first rotator and the second power transmission system, wherein the damper comprises a coupling member incorporating a viscous fluid in a space of the coupling member, the viscous fluid being configured to provide a resistance against rotation of the coupling member, the coupling member is rotatably supported by a rotary shaft of the first rotator, and a rotating resistor configured to rotate integrally with the rotary shaft is incorporated in the space of the coupling member together with the viscous fluid.