Image forming apparatus and process cartridge including protrusion to receive a force for moving developing roller

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;
• and
• a protrusion having a surface 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 with the photosensitive drum and the protrusion positioned at a bottom side of the process cartridge, (i) the rotational axis of the photosensitive drum is lower than the rotational axis of the developing roller, and (ii) as viewed in a direction of the rotational axis of the photosensitive drum, the surface of the protrusion extends in a direction that is parallel to at least a part of an edge of a sidewall of the first frame, with the surface of the protrusion and the sidewall facing the same direction.

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;
• and
• a protrusion having a surface 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 with the photosensitive drum and the protrusion positioned at a bottom side of the process cartridge, (i) the rotational axis of the photosensitive drum is lower than the rotational axis of the developing roller, and (ii) as viewed in a direction of the rotational axis of the photosensitive drum, the surface of the protrusion extends in a direction that is parallel to a part of a surface of a sidewall of the first frame, with the surface of the protrusion and the part of the surface of the sidewall facing the same direction.