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US 11,487,213 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorGo Katsumata
Life of this patent
Estimating the term…
Abstract
An image forming apparatus comprises a spacing member provided on a rotation shaft of a charging roller, the spacing member configured to include an engaging portion that engages with a rotation member, and to be rotatable between a spaced position at which a spaced state in which a photosensitive drum and the charging roller are spaced apart is maintained, and a released position at which the spaced state is released and the photosensitive drum and the charging roller are caused to be in contact; and a cover portion provided on the rotation shaft of the charging roller, and configured to cover an end face of the spacing member so that a fitting portion of the charging roller and the spacing member is covered.
Claims14
An image forming apparatus comprising:
- a frame;
- a photosensitive drum supported so as to be rotatable with respect to the frame;
- a charging roller including an elastic layer, supported by the frame so as to be rotatable, and configured to contact the photosensitive drum and charge the photosensitive drum;
- an urging portion configured to urge the charging roller in a direction toward the photosensitive drum;
- a driving source configured to rotationally drive the photosensitive drum;
- a rotation member configured to rotate using a driving force inputted from the driving source;
- a spacing member provided on a rotation shaft of the charging roller and held to be rotatable on the rotation shaft of the charging roller, the spacing member configured to include an engaging portion that engages with the rotation member and receives a driving force from the rotation member, and to be rotatable between a spaced position at which, in a state in which the engaging portion is engaged with the rotation member, a spaced state in which the photosensitive drum and the charging roller are spaced apart is maintained, and a released position at which the spaced state between the photosensitive drum and the charging roller is released and the photosensitive drum and the charging roller are caused to be in contact;
- and
- a cover portion provided on the rotation shaft of the charging roller, and configured to cover an end face of the spacing member with respect to a direction of a rotation axis of the charging roller so that a fitting portion of the charging roller and the spacing member is covered, and rotate together with the charging roller.
6 more elements
An image forming apparatus comprising:
- a frame;
- a photosensitive drum supported so as to be rotatable with respect to the frame;
- a charging roller including an elastic layer, supported by the frame so as to be rotatable, and configured to contact the photosensitive drum and charge the photosensitive drum;
- an urging portion configured to urge the charging roller in a direction toward the photosensitive drum;
- a driving source configured to rotationally drive the photosensitive drum;
- a rotation member configured to rotate using a driving force inputted from the driving source;
- a spacing member provided on a rotation shaft of the charging roller and held to be rotatable on the rotation shaft of the charging roller, the spacing member configured to include an engaging portion that engages with the rotation member and receives a driving force from the rotation member, and to be rotatable between a spaced position at which, in a state in which the engaging portion is engaged with the rotation member, a spaced state in which the photosensitive drum and the charging roller are spaced apart is maintained, and a released position at which the spaced state between the photosensitive drum and the charging roller is released and the photosensitive drum and the charging roller are caused to be in contact;
- a cover portion provided on the rotation shaft of the charging roller, and configured to cover an end face of the spacing member with respect to a direction of a rotation axis line of the charging roller so that a fitting portion of the charging roller and the spacing member is covered, and rotate together with the charging roller;
- and
- a clutch provided between the spacing member and the cover portion with respect to an axial direction of the rotation shaft of the charging roller, and configured to switch between a state in which rotation of the charging roller is transmitted to the spacing member and a state in which rotation of the charging roller is not transmitted to the spacing member.
7 more elements
Dependencies are inferred from the claim text.