Image forming apparatus including a movable engageable member and process cartridge including a force receiving portion

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 formed 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 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 such that the photosensitive drum is 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, (i) the protrusion is positioned downward from the developing roller, (ii) the surface of the protrusion at least partially faces upward, and (iii) as seen in a direction of the axis of the photosensitive drum, the axis of the second frame and the axis of the photosensitive drum are on the same side of a line that at least partially extends along the surface of the protrusion.

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 curved surface that 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 is 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, (i) the protrusion is positioned downward from the developing roller, (ii) a line that is normal to a line that is tangent to the curved surface extends away from the curved surface in a direction that is at least partially upward, and (iii) as seen in a direction of the axis of the photosensitive drum, the normal line extends toward the same side of the tangent line as the axis of the second frame and the axis of the photosensitive drum.

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 formed on a 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 to the photosensitive drum such that the developing roller can develop the latent image 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 that 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 developing roller is positioned in the first position and the process cartridge is oriented such that the photosensitive drum is 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, (i) the protrusion is positioned downward from the developing roller, (ii) a line that is normal to the surface extends away from the surface at least partially in an upward direction, and (iii) as seen in a direction of the axis of the photosensitive drum, the axis of the second frame and the axis of the photosensitive drum are on the same side of a line that at least partially extends along the surface.