Patent 7922172 was granted and assigned to Hitachi on April, 2011 by the United States Patent and Trademark Office.
A bottom surface of a stacking and accommodating portion is structured such as to be sloped to be lower in accordance with moving away from a paper carry-in side, and a push plate is controlled so as to be moved in a direction moving close to a carry-in port of the paper by detecting a stack paper width determined on the basis of a product of a stacked number count information of the papers and a thickness information per one paper, and the papers are accommodated.