PHOTOSENSITIVE MEMBER UNIT AND IMAGE FORMING APPARATUS INCLUDING THE SAME

摘要

A photosensitive member unit for an image forming apparatus includes a rotatable photosensitive drum; a charging roller including an elastic layer; a first spring urging the roller toward the drum; a drive receiving portion provided on the drum; a rotatable spacer including a contact portion contacted to the drive receiving portion and capable of receiving the driving force through the drive receiving portion, the spacer being rotatable between a spacing position for maintaining a spaced state in which the contact portion contacts the drive receiving portion to space the roller from the drum, and a contact position in which the spaced state between the drum and the roller is disestablished, and the spacer being movable toward the drum; a supporting member urging the spacer in a state that spacer is in the spacing position; and a second spring urging the supporting member toward a rotation axis of the spacer.

主权项

1. A photosensitive member unit detachably mountable to a main assembly of a image forming apparatus, said photosensitive member unit comprising:
a rotatable photosensitive member; a charging member including an elastic layer and contactable to said photosensitive member to electrically charge said photosensitive member; first urging means configured to urge said charging member toward said photosensitive member; a drive receiving portion provided on said photosensitive member to receive a driving force for rotating said photosensitive member from the main assembly; a rotatable spacer member including a contact portion contacted to said drive receiving portion and capable of receiving the driving force through said drive receiving portion, said spacer member being rotatable between a spacing position for maintaining a spaced state in which said contact portion contacts said drive receiving portion to space said charging member from said photosensitive member, and a contact position in which the spaced state between said photosensitive member and said charging member is disestablished to permit contact between said photosensitive member and said charging roller, and said spacer member being movable toward said photosensitive member with movement of said charging roller toward said photosensitive member by said first urging means when the spaced state is disestablished; a supporting member configured to urge and support said spacer member in a state that spacer member is in the spacing position; and second urging means configured to urge said supporting member toward a rotation axis of said spacer member.