Charging device having a holding member that holds a charging member and a cleaning member, and image forming apparatus using the charging device

摘要

A charging device includes a charging member that is opposed to and contacts a charged body, the charging member extending axially and rotating in response to rotation of the charged body, a cleaning member that extends axially along the charging member, and contacts a surface of the charging member to clean the charging member, a holding member that holds the charging member and the cleaning member in a manner allowing their displacement by a substantially constant amount while maintaining a distance between their axes, multiple bearing members provided to the holding member with their rotation being arrested, the bearing members individually supporting the shafts of the charging member and cleaning member in a manner allowing their rotation, the bearing members being displaced to follow a change in orientation of the shafts, and an urging member that urges the holding member to press the charging member onto the charged body.

主权项

1. A charging device comprising:
a charging member that is opposed to and contacts a charged body that is to be electrically charged, the charging member extending in an axial direction, the charging member rotating in response to rotation of the charged body, the charging member having a shaft; a cleaning member that extends in an axial direction along the charging member, the cleaning member contacting a surface of the charging member to clean the charging member, the cleaning member having a shaft; a holding member that has a plurality of recesses which support respectively the charging member and the cleaning member in a manner that allows the charging member and the cleaning member to be displaced by a substantially constant amount while maintaining a distance between their axes; a plurality of bearing members respectively fitted into the plurality of recesses of the holding member in a state in which rotation of the bearing members is arrested, wherein a first of the plurality of bearing members individually supporting only one shaft from among the shaft of the charging member and the shaft of the cleaning member and a second of the plurality of bearing members individually supporting the other shaft among the shaft of the charging member and the shaft of the cleaning member in a manner that allows rotation of the shafts, the bearing members being displaced so as to follow a change in orientation of the shafts; and an urging member that urges the holding member so as to press the charging member onto the charged body, wherein: each of the bearing members has a receiving part that supports the shaft of the charging member or the shaft of the cleaning member in a manner that allows rotation of the shaft, the receiving part being formed by a recess having a substantially circular cross-section; the charging device further comprises a detent member disposed in the holding member; and the receiving part has a mating detent part at a bottom of the receiving part, the mating detent part being engaged with the detent member disposed in the holding member to arrest rotation.