Patent ID: 8083222

Claim:
A stacking apparatus comprising: a cassette which accommodates a plurality of recording media in a superimposed manner; a mounting portion on which the cassette is mounted; a transportation path which is arranged at a downstream side in a direction in which the cassette is mounted on the mounting portion and on which the recording media are transported from the cassette mounted on the mounting portion; a stopper of which surface for regulating downstream side edges of the recording media regulates the side edges until the cassette is mounted on the mounting portion and of which surface for regulating the side edges of the recording media releases the regulation of the side edges with a rotational operation after the cassette is mounted on the mounting portion, wherein a first comb-tooth shape is provided on a back surface of the regulating surface of the stopper for regulating the side edges and a second comb-tooth shape which engages with the first comb-tooth shape is provided on a surface of the slider at a side opposed to the stopper; and a slider which slides along a back surface of the regulating surface of the stopper for regulating the side edges.