Developing Cartridge Having Drive-Force Receiving Member

摘要

In a developing cartridge, a drive-force receiving member includes: a first cylindrical part having a gear part transmitting drive force to a developing roller; a second cylindrical part disposed radially inward of the first cylindrical part and in contact with a support part; and a receiving part receiving drive force from outside of the developing cartridge. The receiving part is disposed outward of the first and second cylindrical parts in an axial direction in which a rotational axis extends. The receiving part has an internal space in communication with a gap between the first and second cylindrical parts. The receiving part is disposed such that the receiving part overlaps the gap between the first and second cylindrical parts when the receiving part is viewed in the axial direction. The receiving part has an outward end in the axial direction, at least part of the outward end of the receiving part being closed.

主权项

1. A developing cartridge comprising:
an enclosure configured to accommodate developer therein and having a support part; a developing roller; and a drive-force receiving member configured to receive a drive force from an outside of the developing cartridge and supported by the support part so as to be rotatable about a rotational axis relative to the support part, the drive-force receiving member including: a first cylindrical part having a gear part configured to transmit a drive force to the developing roller; a second cylindrical part disposed radially inward of the first cylindrical part with a gap being formed between the first cylindrical part and the second cylindrical part, the second cylindrical part being in contact with the support part; and a receiving part configured to receive a drive force from the outside of the developing cartridge, the receiving part being disposed outward of both of the first cylindrical part and the second cylindrical part in an axial direction in which the rotational axis extends, the receiving part having an internal space that is in communication with the gap formed between the first cylindrical part and the second cylindrical part, the receiving part being disposed such that the receiving part overlaps the gap between the first cylindrical part and the second cylindrical part when the receiving part is viewed in the axial direction, the receiving part having an outward end in the axial direction, at least part of the outward end of the receiving part being closed.