Developing cartridge including developing roller to contact photosensitive drum and image forming apparatus including the same

A developing cartridge for use with a drawer including a frame and photosensitive drum, the developing cartridge comprising:

• a casing configured to accommodate developing agent therein;
• a developing roller rotatable about an axis extending in a first direction, the developing roller being movable with the casing;
• and
• a separation cam movable in the first direction relative to the casing, and movable together with the casing relative to the photosensitive drum in a direction crossing the first direction;
• wherein the casing is movable relative to the drawer in accordance with movement of the drawer from a first position in which developing roller is separated from the photosensitive drum and the separation cam is in contact with a frame of the drawer to a second position in which the developing roller is in contact with the photosensitive drum and the separation cam is separated from the frame of the drawer.

A developing cartridge for use with a drawer including a photosensitive drum, the developing cartridge comprising:

• a casing configured to accommodate developing agent therein;
• a developing roller rotatable about an axis extending in a first direction, the developing roller being movable with the casing;
• and
• a first boss extending in the first direction;
• wherein the drawer has a support surface configured to allow the first boss to be seated and configure to receive a weight of the developing cartridge, and
• wherein the casing is pivotally movable about the first boss relative to the drawer in accordance with movement of the drawer from a first position in which developing roller is separated from the photosensitive drum and the first boss is in contact with the support surface to a second position in which the developing roller is in contact with the photosensitive drum.