Image forming apparatus and process cartridge

A process cartridge comprising:

• a photosensitive drum;
• a first frame rotatably supporting the photosensitive drum to permit rotation of the photosensitive drum about a rotational axis of the photosensitive drum;
• a developing roller for developing a latent image on the photosensitive drum;
• a second frame rotatably supporting the developing roller to permit rotation of the developing roller about a rotational axis of the developing roller, the second frame being pivotable about a pivot axis between (i) a first position in which the developing roller contacts the photosensitive drum such that the developing roller can develop the latent image formed on the photosensitive drum and (ii) a second position in which the developing roller is spaced apart from the photosensitive drum;
• a developing roller coupling provided at the one end of the second frame and operatively connected to the developing roller, the developing roller coupling being configured to transmit a rotational force to the developing roller;
• a side end wall attached to the one end of the second frame and having an end wall body with a first hole formed therein through which the developing roller coupling is exposed to outside of the cartridge;
• and
• a protrusion operatively connected to the one end of the second frame, the protrusion having a surface a part of which is configured to receive a force to move the second frame from the first position to the second position,
• wherein the process cartridge is configured such that, when the second frame is in the first position and the process cartridge is oriented such that the photosensitive drum and the protrusion are positioned at a downward side of the process cartridge with the axis of the photosensitive drum positioned downward from the axis of the developing roller, as seen in a direction of the axis of the photosensitive drum, the surface of the protrusion is exposed and not blocked by the side end wall.