Patent ID: 7486909

Claim:
An image forming apparatus comprising: a main frame casing formed with an opening; a door provided with the main frame casing, the door being configured to cover the opening; a plurality of drum cartridges provided in the main frame casing in a substantially horizontal arrangement, each of the plurality of drum cartridges being removable from the main frame casing and comprising a photosensitive drum; an optical unit provided in the main frame casing, the optical unit being configured to irradiate a light to a surface of each of the photosensitive drums; a plurality of developer cartridges provided in the main frame casing, each of the plurality of developer cartridges being removable from the main frame casing and comprising a toner housing part configured to accommodate a toner therein; and a belt unit that comprises a belt, the belt unit being configured to be positioned at a first position and a second position; wherein the plurality of photosensitive drums are covered by the belt unit when the belt unit is in the first position.