Patent ID: 8081898

Claim:
A dismounting method for dismounting a magnet roller from a process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the process cartridge including an electrophotographic photosensitive drum, a drum frame rotatably supporting one longitudinal end of the electrophotographic photosensitive drum, a drum bearing member rotatably supporting the other longitudinal end of the electrophotographic photosensitive drum and connected to the other longitudinal end of the drum frame by an adhesive, a developing roller for developing an electrostatic latent image formed on the electrophotographic photosensitive drum, the magnet roller being provided inside said developing roller and being movable in the longitudinal direction, a first side member supporting one longitudinal end of the magnet roller and connected to one longitudinal end of a developing device frame, and a second side member supporting the other longitudinal end of the magnet roller and connected to the other longitudinal end of the developing device frame, said method comprising: a first separating step of inserting a tool between the first side member and the developing device frame and applying a force so as to separate the first side member and the developing device frame from each other; a second separating step of expanding the distance between the one longitudinal end of the developing device frame and the one longitudinal end of the drum frame to separate the other longitudinal end of the developing device frame and the other longitudinal end of the drum frame from each other; a developing roller dismounting step of dismounting the developing roller from the developing device frame; and a magnet roller dismounting step of dismounting the magnet roller from the developing roller by dismounting a flange from the developing roller by applying a force to a longitudinal end portion of the developing roller dismounted from the developing device frame in said developing roller dismounting step.