| 主权项 |
1. 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; anda 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; 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; a sensing member configured to detect presence of the spacer when the process cartridge is attached to the housing; a malfunction reporting unit configured to report malfunction when the sensing member detects the presence of the spacer; and a registration roller configured to convey an image recording sheet to the photosensitive member in a conveying direction, the sensing member being further configured to detect presence of the image recording sheet being conveyed between the registration roller and the photosensitive member. |
