Patent ID: 8107855

Claim:
An image forming device comprising: a main casing; a photosensitive drum unit including a plurality of photosensitive drums for forming electrostatic images thereon, each of the plurality of photosensitive drums defining an axis line, the plurality of photosensitive drums being juxtaposed along a line extending in a first direction orthogonal to the axis line; and a developing device unit movable to and from a predetermined position in the main casing along the first direction when mounted in the main casing, the developing device unit comprising: a plurality of developing devices, when mounted in the main casing, disposed in one-to-one correspondence with the plurality of photosensitive drums, each developing device including a developing roller that is configured to supply toner to corresponding photosensitive drum to develop the electrostatic images formed thereon and having a shaft extending in a second direction parallel to the axis line of the photosensitive drum; and a supporting member that is configured to support the plurality of developing devices to be movable between a first position for supplying toner to corresponding photosensitive drums and a second position retracted from the first position, wherein the supporting member is configured to remain stationary when the plurality of developing devices is moved between the first position and the second position, and the developing device unit is movable from the predetermined position in the main casing by drawing the supporting member when the plurality of developing devices is in the second position.