Patent ID: 8515306

Claim:
A cartridge detachably mountable to a main assembly of the image forming apparatus, said cartridge comprising: a portion to be urged by an urging portion of the image forming apparatus so as to be moved in a crossing direction which crosses an inserting direction in which said cartridge is inserted into the image forming apparatus, after said cartridge is inserted into the main assembly of the image forming apparatus through an opening in the main assembly; a portion to be positioned by contacting a positioning portion of the image forming apparatus by said cartridge being moved by the urging portion in the crossing direction to position said cartridge relative to the main assembly of the apparatus; and a portion to be regulated by a regulating portion of the image forming apparatus so as to prevent said cartridge from moving toward an outside of the image forming apparatus through the opening therein in a state that the portion to be positioned contacts the positioning portion, wherein the regulating portion is provided in downstream side of the opening with respect to the inserting direction, and said portion to be regulated is brought, by movement of said cartridge in the crossing direction by the urging portion, to a regulating position where said portion to be regulated is disposed downstream of the regulating portion with respect to the inserting direction to prevent said cartridge from moving toward the outside of the image forming apparatus through the opening.