Developing device and process cartridge for suppressing toner leakage

摘要

A developing device configured to prevent a leakage of developer through a gap between a frame and a longitudinal end of a developer supply roller, includes an elastic bush member, a groove to which the bush member is attached and including an opening to allow an end of the developer supply roller to pass through a seating surface when the developer supply roller is mounted on the groove in a direction intersecting the longitudinal direction, an abutment portion for regulating movement of the bush member in the longitudinal direction, and a bearing member configured to rotatably support an end of the developer supply roller and compress, in the longitudinal direction, the bush member sandwiched between the abutment portion and the bearing member and bias the bush member against an inner wall of the groove.

主权项

1. A developing device to be used in an image forming apparatus, the developing device comprising:
a frame member; a developing roller configured to develop a latent image formed on an image bearing member using developer; a developer supply roller configured to supply the developer to the developing roller; an end sealing member configured to prevent a leakage of the developer through a gap between the frame member and an end of the developing roller in a longitudinal direction thereof; a bush member having elasticity, the bush member being configured to prevent a leakage of the developer from gap between the frame member and an end of the developer supply roller in a longitudinal direction thereof; a first groove configured to fix the bush member; and an abutment portion configured to regulate movement of the bush member in the longitudinal direction, wherein the frame member includes a second groove formed in a wall portion that includes the abutment portion so as to be adjacent to the first groove in the longitudinal direction, and the second groove is configured to engage with the end of the developer supply roller.