Patent ID: 7668502

Claim:
A paper cassette, comprising: a base frame adapted to be detachably coupled to a main body of an image forming apparatus and receiving a leading end of paper; a movable frame inserted in the base frame and slidable on the base frame, the movable frame receiving a trailing end of the paper, the movable frame including a first movable frame slidably inserted in the base frame and a second movable frame slidably inserted in the first movable frame; and a fixing unit fixing the movable frame at a position selected from a plurality of preset fixing positions, the fixing unit having a plurality of fixing holes and a plurality of fixing protrusions respectively formed on the bottom surfaces of the base frame and the movable frames for being coupled with each other, the fixing protrusions being elastically coupled to the fixing holes and being releasable from the fixing holes by being depressed, wherein the fixing protrusions include a first fixing protrusion and a second fixing protrusion that are formed on the first movable frame, the first fixing protrusion determining a fixing position of the first movable frame, the second fixing protrusion determining a fixing position of the second movable frame relative to the first movable frame, wherein the first fixing protrusions are formed on both sides of the first movable frame in a symmetric manner and are released from the fixing holes when depressed, and the second fixing protrusion is formed on a center portion of the first movable frame and released from the fixing hole when depressed, and wherein the paper cassette is adjustable by a sliding motion of the movable frame by selectively changing the coupling positions between the fixing holes and the fixing protrusions.