Image-forming apparatus including drawer and detachable cartridge having protrusion configured to be received in recess of the drawer

An image-forming apparatus comprising:

• a main housing including a first main-body contact and a second main-body contact;
• a drawer movable in a first direction relative to the main housing, the drawer including:
• a drawer frame;
• a first drawer electrode configured to be electrically connected to the first main-body contact;
• and
• a second drawer electrode configured to be electrically connected to the second main-body contact;
• and
• a cartridge attachable to and detachable from the drawer, the cartridge including:
• a developing roller including a developing shaft extending in a second direction crossing the first direction;
• a photosensitive drum including a drum shaft extending in the second direction;
• a side cover positioned at one end portion of the developing roller in the second direction;
• and
• a cartridge electrode configured to be electrically connected to both the first drawer electrode and the second drawer electrode, the cartridge electrode being positioned at the side cover,
• wherein the drawer frame has a first recess recessed in a third direction crossing both the first direction and the second direction, and
• wherein the side cover has a first protrusion protruding in the third direction, the first protrusion being configured to be received in the first recess.