| 摘要 |
<p>A developing cartridge (17) includes a developing roller (6), an input gear (40), a transmission gear (41,42,43), and a supporting cover (100). The input gear (40) includes a contact portion (81,84), an outer circumferential wall (80), and a gear portion (79). The contact portion (81,84) is in contact with a coupling member (90) to receive the driving force. The outer circumferential wall (80) and the gear portion (79) rotate about a rotational axis defining an axial direction when the contact portion (81,84) receives the driving force. The outer circumferential wall (80) has a curved surface whose center of radius of a curvature is coincident with the rotational axis. The transmission gear is meshingly engaged with the gear portion (79) to transmit the driving force from the input gear (40) to the developing roller (6). The supporting cover covers the curved surface of the outer circumferential wall (80) to rotatably support the outer circumferential wall.</p> |
