Cartridge and electrophotographic image forming apparatus

An image forming apparatus comprising:

• (1) a photosensitive drum;
• (2) a developing cartridge including:
• (2-1) a developing roller configured to supply toner to the photosensitive drum and to rotate about a rotational axis, and
• (2-2) a guided portion protruding from an end surface of the developing cartridge in a direction of the rotational axis;
• (3) a main assembly to which the developing cartridge is mountable in a mounting direction crossing the rotational axis and from which the developing cartridge is dismountable in a dismounting direction opposite to the mounting direction, in a state in which the photosensitive drum is inside the main assembly, the main assembly including:
• (3-1) a main assemble frame provided with an opening portion through which the developing cartridge passes when the developing cartridge is mounted to and dismounted from the main assembly;
• (3-2) a first guide portion provided on a side surface portion of the main assembly frame, which crosses the rotational axis, the first guide portion including a first receiving portion located in a vicinity of the opening portion and a delivery portion located below the first receiving portion;
• and
• (3-3) an opening and closing member configured to open and close the opening portion;
• and
• (4) a moving unit including a second guide portion, the moving unit being configured to move to a guide position, in the main assembly frame, for guiding the developing cartridge, the second guide portion including a second receiving portion located in a vicinity of the delivery portion of the first guide portion when the moving unit is in the guide position and a positioning portion,
• wherein the first guide portion guides the guided portion of the developing cartridge delivered from the first receiving portion to the delivery portion when the developing cartridge is mounted the main assembly being in a state in which the moving unit is located at the guide position,
• wherein the second guide portion receives, from the second receiving portion thereof, the guided portion of the developing cartridge delivered from the delivery portion of the first guide portion, and guides the guided portion of the developing cartridge to the positioning portion thereof,
• wherein the positioning portion of the second guide portion positions the developing cartridge with respect to the second guide portion by contacting the guided portion of the developing cartridge, and
• wherein the first guide portion is not in contact with the guided portion of the developing cartridge in a state in which the positioning portion of the second guide portion is in contact with the guided portion of the developing cartridge.