Image forming apparatus provided with process cartridge

An image forming apparatus comprising:

• a housing;
• a process cartridge detachably attached to the housing, the process cartridge comprising:
• a drum unit including a photosensitive member;
• and
• a developing unit including a developing roller, an accommodating portion configured to accommodate developing agent, and a first wall, the developing roller defining a first axis extending in an axial direction and being configured to rotate about the first axis and supply the developing agent to the photosensitive member, the first wall having a first surface and a second surface opposite thereto, the first surface extending in the axial direction and facing the developing roller;
• and
• a protective member detachably attached to the process cartridge and including a spacer, the drum unit including a second wall having a third surface extending in the axial direction and facing the second surface, the spacer being disposed between the second surface and the third surface,
• wherein the first wall and the second wall form walls of a path for guiding an image recording sheet from outside the process cartridge toward the photosensitive member, and
• wherein, when the protective member is attached to the process cartridge, the spacer is inserted between the first wall and the second wall along the path in an insertion direction.

An image forming apparatus comprising:

• a housing;
• a process cartridge detachably attached to the housing, the process cartridge comprising:
• a drum unit including a photosensitive member;
• and
• a developing unit including a developing roller, an accommodating portion configured to accommodate developing agent, and a first wall, the developing roller defining a first axis extending in an axial direction and being configured to rotate about the first axis and supply the developing agent to the photosensitive member, the first wall having a first surface and a second surface opposite thereto, the first surface extending in the axial direction and facing the developing roller;
• and
• a protective member detachably attached to the process cartridge and including a spacer, the drum unit including a second wall having a third surface extending in the axial direction and facing the second surface, the spacer being disposed between the second surface and the third surface,
• wherein the housing further includes a drive input member configured to be moved between an advanced position and a retracted position in the axial direction, and configured to input a drive force into the process cartridge when the process cartridge is attached to the housing,
• wherein the process cartridge further comprises a drive receiving unit configured to engage the drive input member to receive the drive force from the drive input member, and
• wherein the protective member further includes a covering part positioned between the drive input member and the drive receiving unit so as to cover the drive receiving unit when the protective member is attached to the process cartridge.