Patent ID: 9625853
Date: 2017-04-18
CPC Classifications: G03G

Claim:
1. A process cartridge comprising: a drum cartridge including a photosensitive drum; and a developing cartridge configured to be detachably mountable in the drum cartridge, the developing cartridge including a developing roller, wherein the developing roller being in pressure contact with the photosensitive drum in a state where the developing cartridge is mounted in the drum cartridge, the developing roller extends in an axial direction, the developing roller comprising: a shaft extending in the axial direction, the shaft including: a hollow cylindrical rubber covering an outer peripheral surface of the first columnar portion, an outer peripheral surface of the second columnar portion, and an outer peripheral surface of the third columnar portion, the outer peripheral surface of the first columnar portion and the outer peripheral surface of the second columnar portion being arranged in contact with an inner peripheral surface of the hollow cylindrical rubber, the outer peripheral surface of the third columnar portion being arranged spaced apart from the inner peripheral surface of the hollow cylindrical rubber, and wherein the inner peripheral surface of the hollow cylindrical rubber and the outer peripheral surface of the third columnar portion defines a first distance in a radial direction of the third columnar portion when the developing cartridge has been mounted in the drum cartridge, and the inner peripheral surface of the hollow cylindrical rubber and the outer peripheral surface of the third columnar portion defines a second distance in the radial direction when the developing cartridge has been detached from the drum cartridge, the first distance being smaller than the second distance.