Image forming apparatus including movable process unit that supports photosensitive drum

An image forming apparatus configured to form an image on a sheet, the image forming apparatus comprising:

• a main body housing comprising:
• a first side wall;
• a second side wall spaced apart from the first side wall in a first direction;
• a rear wall;
• and
• a front wall having an opening and spaced apart from the rear wall in a second direction;
• a process unit supporting a photosensitive drum, the photosensitive drum extending in the first direction;
• an exposure device configured to expose the photosensitive drum to form a latent image on a peripheral surface of the photosensitive drum;
• a transfer roller configured to transfer a toner image formed on the photosensitive drum to the sheet;
• and
• a fixing device configured to fix the toner image, which has been transferred to the sheet, on the sheet, and being spaced upward from the photosensitive drum;
• wherein the process unit is movable between
• an inner position where the process unit is accommodated inside the main body housing, and
• an outer position where at least a part of the process unit is drawn out of the main body housing through the opening,
• wherein, when the process unit is at the inner position, the transfer roller is at a position between the rear wall and the photosensitive drum, and
• wherein the process unit is configured to move downward as the process unit moves from the inner position to the outer position.