Patent ID: 8583004

Claim:
An image-forming apparatus comprising: a plurality of photosensitive drums arranged parallel to one another and spaced at intervals; a plurality of exposure units, each provided for a corresponding photosensitive drum of the plurality of photosensitive drums, each of the plurality of exposure units being configured to be moved between an adjacent position where the exposure unit is configured to expose the corresponding photosensitive drum and a retracted position positioned farther than the adjacent position from the corresponding photosensitive drum; and a cam member configured to move the plurality of exposure units between the adjacent position and the retracted position, wherein each of the exposure units comprises a first contact part configured to contact the cam member, wherein the cam member has a plurality of first exposure-side surfaces and a plurality of second exposure-side surfaces, each of the plurality of first exposure-side surfaces and the plurality of second exposure-side surfaces being provided in association with a corresponding first contact part, wherein each first contact part is configured to confront but be separated from the corresponding first exposure-side surface when the corresponding exposure unit is disposed in the adjacent position, and wherein each first contact part is configured to contact the corresponding second exposure-side surface when the corresponding exposure unit is disposed in the retracted position.