Patent ID: 7747192

Claim:
A process cartridge comprising: an image carrier body; a developing roller configured to hold toner thereon; a housing configured to support said image carrier body and said developing roller; a toner cartridge for holding said toner therein, said toner cartridge being configured to be installed in and removed from said housing, the developing roller being interposed between the image carrier body and the toner cartridge; and an attachment device mounted to an inside surface of the housing, said attachment device being configured to apply a pressing force to the toner cartridge to press the developing roller against the image carrier body when said toner cartridge is installed in said housing, wherein said toner cartridge comprises an operation part that is positioned at a first position and a second position selectively, and said attachment device applies the pressing force to the toner cartridge when said operation part has been positioned at the first position, and releases the pressing force when said operation part has been positioned at the second position.