Cartridge and electrophotographic image forming apparatus

A cartridge for a main assembly of an electrophotographic image forming apparatus, wherein the main assembly includes a rotatable driving coupling member including a driving force transmitting portion for transmitting a driving force and a driving side abutment portion, wherein said cartridge is demountable in a direction substantially perpendicular to a rotational axis of the driving coupling member, comprising:

• a rotatable driven coupling member including a driving force receiving portion for receiving the driving force, and a driven side abutment portion to be abutted by the driving side abutment portion, said driven coupling member being slidable in a predetermined direction which is substantially parallel with a rotational axis of said receiving coupling member;
• wherein at least one of said driving side abutment portion and said driven side abutment portion is inclined so that said driven coupling member is retractable away from the driving coupling member in the predetermined direction by a force received by driven side abutment portion from the driving side abutment portion, and
• wherein a distance between the rotational axis of said driven coupling member and said abutment portion of said receiving abutment portion is not more than a distance between the rotational axis of said driven coupling member and said driving force receiving portion.