Developing Cartridge and Process Cartridge For Stably Rotating Developing Roller

摘要

A developing cartridge includes: a housing having first and second sidewalls through which respective end portions of a developing roller shaft are rotatably inserted; a developing gear, which is arranged outside of the first sidewall, and which is fixed to the end portion of the developing roller shaft; a transmission gear, which is arranged outside of the first sidewall, and which transmits driving force to the developing gear; a first cover member, which is attached to the first sidewall, and which covers the transmission gear; and a second cover member, which is attached to the first sidewall, and which covers the developing gear from an outer side in the axis line direction. The second cover member is formed separately from the first cover member and is arranged side by side with the first cover member outside of the first sidewall.

主权项

1. A developing cartridge comprising:
a developing roller having a rotational axis, the developing roller including: a developing roller main body having a first end and a second end opposite to the first end; a first protrusion protruding outwardly from the first end of the developing roller main body along the rotational axis, a second protrusion protruding outwardly from the second end of the developing roller main body along the rotational axis, and a developing gear, wherein the first protrusion has a circular peripheral surface having no stepped circumferential surface; and wherein the second protrusion includes: a small diameter part having a circular peripheral surface having a diameter smaller than a diameter of the first protrusion; and a gear fixing part disposed between the developing roller main body and the small diameter part along the rotational axis and having a D-cut part, the gear fixing part fixing the developing gear, a gear cover covering at least a portion of the developing gear, the gear cover having an outwardly protruding insertion part through which the small diameter part of the second protrusion is inserted.