| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a developing unit that can suppress reduction in the accuracy of drive transmission by a drive train that transmits the drive to a developing roller provided in the developing unit, and a process cartridge and an image forming apparatus including the developing unit.SOLUTION: A developing unit 9 includes a rotatable developer carrier 6, a drive input part 74b that receives the input of a rotational driving force to rotate the developer carrier 6, and a plurality of gears 68 and 69 that transmit the rotational driving force transmitted from the drive input part 74b to the developer carrier 6. At least one of the plurality of gears has a tooth surface in a crowning shape where the thickness at the center part in the tooth width direction is larger than the thickness at the ends in the tooth width direction.</p> |
