Patent ID: 8718515

Claim:
An image forming apparatus comprising: a photosensitive drum configured to rotate around an axis; a first rotational member disposed proximate a periphery of the photosensitive drum and configured to rotate about an axis parallel to the rotational axis of the photosensitive drum; a driving-force transmitting member; a driven member, including: a transmitted portion; and a first engaging projection, wherein the driven member is configured to rotate about the rotational axis of the photosensitive drum together with the photosensitive drum, wherein the transmitted portion of the driven member is configured to receive a driving force transmitted from the driving-force transmitting member; and a rotational-member driving gear, including: a loose fit portion configured to engage with the first engaging projection; and a transmission gear portion configured to transmit the driving force to the first rotational member, wherein the rotational-member driving gear is rotatable about the rotational axis of the driven member.