PURPOSE: To make it possible to butt and align paper sheets which are difficult slide, and to increase the speed of butting and alignment of the paper sheets, by providing a pressing plate facing one end face of the stacked paper sheets, to a side plate which receives one end of the stacked paper sheets on a table, for aligning them.

CONSTITUTION: A side plate frame 15 receiving one end of stacked paper sheets 20 on a table 2, for aligning the same, is rotatably supported on the table 2, and is provided thereto with a pressing plate 16 which may by reciprocated in the direction along the upper surface of the table 2 by means of an air cylinder 17. Further, the stacked paper sheets 20 which have been fed, are pressed at one end face toward the pressing plate 16 due to inclination and vibration of the table 2. When the stacked paper sheets 20 approach and make contact with the pressing plate 16 which reciprocates, they are pushed back and again moved toward the pressing plate 16 due to the vibration. Thus, due to the repetitions of impingement against the pressing plate 16, the stacked paper sheets may be butted and aligned even if they are difficult to slide. The reciprocation of the pressing plate 16 is in a range of about 1W5mm while the frequency of vibration is in a range of about 1W20 per sec.