Image Forming Apparatus and Developing Cartridge

A developing cartridge to be detachably mountable in an apparatus body of an image forming apparatus, the developing cartridge comprising:

• a developing roller which is configured to supply developer to a photosensitive drum;
• a supporting shaft;
• and
• a movable member which is rotatably supported by the supporting shaft,
• wherein the movable member includes:
• a main body which extends in a direction orthogonal to the supporting shaft, and is rotatably supported by the supporting shaft at a first end portion of the main body in a longitudinal direction thereof;
• an input portion which is provided at a second end portion of the main body opposite to the first end portion, and to which a pressing force is input from an external member;
• an abutting portion which is provided at a middle portion between the first and second end portions of the main body, and abuts a predetermined portion in the apparatus body while the movable member rotates about the supporting shaft by the input of the pressing force to the input portion;
• and
• an operating portion which applies to the supporting shaft a force for moving the developing cartridge from a first position where the developing roller contacts the photosensitive drum to a second position where the developing roller is separated from the photosensitive drum as the movable member is rotated with the middle portion as a fulcrum by the input of the pressing force to the input portion while the abutting portion abuts the predetermined portion.

An image forming apparatus comprising:

• an apparatus body;
• a drum unit which holds a photosensitive drum, and is movably mounted along a first direction orthogonal to an axial direction of the photosensitive drum;
• a developing cartridge which supports a developing roller for supplying developer to the photosensitive drum, and is detachably mounted in the drum unit, the developing cartridge including a supporting shaft extending along the axial direction;
• a translation member in the apparatus body to be movable linearly in the first direction;
• and
• a movable member including:
• a first part provided at one end thereof, and rotatably supported by the supporting shaft;
• a second part provided at the other end thereof and located at a position abatable on the translation member moving linearly to rotate the movable member about the supporting shaft;
• a middle part provided between the first part and second part, and configured to abut the drum unit when the movable member rotates by the abutment between the translation member and the second part.