Patent ID: 7735822

Claim:
A sheet cassette adapted to be detachably attached to a cassette receiver of an information processing apparatus, the sheet cassette comprising: a cassette body formed with an opened space adapted to contain sheets therein; a stopper comprising a roller adapted to come in contact with an uppermost one of the sheets contained in the opened space when a volume of the sheets reaches a maximum containing capacity of the opened space, a support shaft rotatably supporting the roller and movable in the first direction and the second direction, and a rotation preventing member adapted to come in contact with the roller when the support shaft is moved in a first direction, thereby preventing the roller from rotating, wherein the roller is movable relative to the cassette body operable to prevent a sheet from moving in the first direction to enter the opened space when a volume of the sheets contained in the opened space reaches the maximum containing capacity, while allowing the sheets contained in the opened space to move in a second direction opposite to the first direction to be fed to the information processing apparatus.