Patent ID: 8155557

Claim:
A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus including a main assembly side positioning portion, a main assembly side regulating portion, and a resilient member configured to urge said process cartridge to the main assembly side positioning portions by an urging force, said process cartridge comprising: an electrophotographic photosensitive drum; process means for performing a process on said electrophotographic photosensitive drum; a cartridge side portion to be positioned configured to be positioned at the main assembly side positioning portion by the urging force of the resilient member when said process cartridge is mounted to the main assembly; a cartridge side portion-to-be-regulated configured to be regulated to prevent contact of said cartridge side portion to be positioned to the main assembly side positioning portion, by contact between the main assembly side regulating portion and said cartridge side portion-to-be- regulated, in upward movement thereof when said process cartridge, entering in the main assembly, is urged upwardly by the urging force of the resilient member, wherein, when said cartridge side portion to be positioned is positioned to said main assembly side positioning portion, said cartridge side portion-to-be-regulated is spaced from the main assembly side regulating portion.