Patent ID: 8270879

Claim:
An image forming apparatus comprising: a developing cartridge including a portion to be engaged and a developing roller for developing a latent image formed on an image bearing member; and a rotatable member that includes a mounting portion for permitting mounting and demounting of said developing cartridge and includes an engaging portion engageable with the portion to be engaged in a state in which said developing cartridge is mounted to said mounting portion, said rotatable member being rotatable for moving said mounting portion between a mounting and demounting position, in which said developing cartridge is mountable and demountable, and another position, wherein said engaging portion is movable between a regulating position, in which disengagement of said developing cartridge from said mounting portion is suppressed, and a permitting position in which the disengagement of said developing cartridge from said mounting portion is permitted, and wherein, in a state in which said mounting portion is located at another position, said engaging portion is regulated at the regulating position and, in a state in which said mounting portion is located at the mounting and demounting position, said engaging portion is movable from the regulating position to the permitting position.