Image forming apparatus and process cartridge

摘要

The image forming apparatus includes a drum cartridge having a photosensitive drum and a drum drive input member; a developing cartridge configured to be movably mounted to the drum cartridge, the developing cartridge comprising a developing roller disposed so as to face the photosensitive drum and a developing drive input member; a drum drive transmission member configured to engage with the drum drive input member and configured to transmit drum driving force to the drum drive input member while permitting a positional gap of the drum drive input member within a predetermined range; and a developing drive transmission member configured to engage with the developing drive input member and configured to transmit developing driving force to the developing drive input member while permitting a positional gap of the developing drive input member within a predetermined range.

主权项

1. An image forming apparatus comprising:
a cover provided to a main body that has an opening, the cover being configured to move between a close position for closing the opening and an open position for opening the opening; a drum unit comprising a photosensitive drum and a drum drive input member, the drum drive input member being rotatable and being configured to receive drum driving force for rotating the photosensitive drum; a developing unit comprising:
a developing roller disposed so as to face the photosensitive drum; anda developing drive input member, which is rotatable, and which is configured to receive developing driving force for rotating the developing roller,the developing unit being configured to move between a first position in which the developing roller is in contact with the photosensitive drum and a second position in which the developing roller is spaced apart from the photosensitive drum; a drum drive transmission member that is configured to engage with the drum drive input member and configured to transmit the drum driving force to the drum drive input member, a rotational center of the drum drive transmission member being substantially coincident with a rotational center of the drum drive input member; and a developing drive transmission member that is configured to engage with the developing drive input member and configured to transmit the developing driving force to the developing drive input member, a rotational center of the developing drive transmission member being substantially coincident with a rotational center of the developing drive input member, wherein the developing drive transmission member is provided so as to be movable between:
a developing advance position where the developing drive transmission member advances to the developing drive input member to be brought into engagement with the developing drive input member when the cover is positioned at the close position and the developing unit is positioned at the first position and when the cover is positioned at the close position and the developing unit is positioned at the second position; anda developing retreat position where the developing drive transmission member retreats from the developing drive input member to be disengaged from the developing drive input member when the cover moves from the close position to the open position.