Electrophotographic image forming apparatus

摘要

An image forming apparatus includes a developing cartridge with a developing roller for developing a latent image and a development coupling for receiving a driving force from a main assembly coupling for rotating the developing roller. The apparatus also includes a contacting and spacing member provided on a drum supporting frame, with the contacting and spacing member being movable between a first position for contacting the developing roller to a photosensitive drum and a second position for spacing the developing roller from the photosensitive drum. The developing cartridge is provided with a projection that the contacting and spacing member contacts, and the projection projects in a longitudinal direction of the developing roller.

主权项

1. An image forming apparatus comprising:
a main assembly including a main assembly coupling; a door provided on said main assembly, said door being configured to open and close a main assembly opening; a developing cartridge including (i) a developing roller for developing a latent image and (ii) a development coupling for receiving a driving force from said main assembly coupling for rotating said developing roller; a drum supporting frame including a photosensitive drum and a mounting portion for detachably mounting said developing cartridge, said drum supporting frame being movable through said main assembly opening between an inside and an outside of said main assembly in a state that said developing cartridge is mounted to said mounting portion; a contacting and spacing member provided on said drum supporting frame, said contacting and spacing member being movable between a first position for contacting said developing roller to said photosensitive drum and a second position for spacing said developing roller from said photosensitive drum; and a switching member for switching a position of said contacting and spacing member by applying a force to said developing cartridge, wherein said main assembly coupling engages with said development coupling in interrelation with a closing operation of said door wherein said developing cartridge is provided with a projection that said contacting and spacing member contacts, and said projection projects in a longitudinal direction of said developing roller.