Image forming apparatus

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.