Image Forming Apparatus

An image forming apparatus comprising:

• an apparatus body;
• a tandem photosensitive drum unit which holds a plurality of photosensitive drums to be in parallel with each other, and is movably mounted in the apparatus body along an array direction of the photosensitive drums;
• a developing cartridge which is provided for each of the photosensitive drums, supports a developing roller for supplying developer to the corresponding photosensitive drum, and is detachably mounted in the tandem photosensitive drum unit;
• a translation member which is provided in the apparatus body to be movable linearly in the array direction;
• a first supporting shaft which is provided on the tandem photosensitive drum unit for each of the developing cartridges;
• and
• a pivoting member which is rotatably supported by the first supporting shaft,
• wherein the pivoting member includes:
• an abutting portion which is provided on one side with respect to the first supporting shaft to abut the translation member along the linear movement of the translation member;
• a pressing portion which is provided on the other side with respect to the first supporting shaft, opposes a predetermined portion of the developing cartridge, and is configured to press the predetermined portion in a direction in which the developing roller is separated from the photosensitive drum along the linear movement of the translation member after the translation member abuts on the abutting portion;
• and
• a spring portion which is configured to apply a biasing force in a direction in which the pressing portion is separated from the predetermined portion.