Patent ID: 9335722
Filing Date: 2016-05-10
CPC Classification: G03G

Claim Text:
1. A drum unit for being removably mountable to a supporting unit of an image forming apparatus, the image forming apparatus including a housing and a belt, the supporting unit and the belt being provided in the housing of the image forming apparatus, the drum unit comprising: a pair of side plates that face each other and that are apart from each other in a first direction; and a plurality of photosensitive drums supported by the pair of side plates such that an axial direction of each photosensitive drum is parallel to the first direction and such that each photosensitive drum is movable relative to the pair of side plates, each photosensitive drum having a transfer position on its peripheral side surface, at which each photosensitive drum confronts the belt when the drum unit is mounted in the supporting unit provided in the housing of the image forming apparatus, each side plate having a plurality of urging members and a plurality of stoppers such that one of the urging members corresponds to one of the photosensitive drums and to one of the stoppers, and each urging member being configured to urge a corresponding photosensitive drum toward a corresponding stopper in a direction away from the transfer position.