PROBLEM TO BE SOLVED: To appropriately control a height position of a lifting stage regardless of the weight of paper sheets.;SOLUTION: A lifting stage (400) is configured to be movable to height positions of multiple stages in a piled-up direction of paper sheets. A lifting mechanism (500) moves the lifting stage (400). An accumulation control unit (800), in accumulation processing, controls the lifting mechanism (500) so that the lifting stage (400) is lowered to a next height position (Hk+1), positioned at the lower stage of a height position (Hk) where the lifting stage (400) is arranged, out of the height positions of the multiple stages, when a predetermined amount of the paper sheets are piled up on the lifting stage (400) arranged at the height position (Hk) which is not a lowermost stage out of the height positions of the multiple stages.;SELECTED DRAWING: Figure 10;COPYRIGHT: (C)2019,JPO&INPIT
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机译：解决的问题：无论纸张的重量如何，都适当地控制升降台的高度位置;解决方案：升降台（400）构造成可沿纸张的堆积方向移动到多个台的高度位置。纸。升降机构（500）移动升降台（400）。蓄积控制单元（800）在蓄积处理中控制升降机构（500），使得升降台（400）下降到位于下方的下一高度位置（H k + 1 ）。当将预定量的纸张堆积在多个阶段的高度位置中时，在其中放置提升阶段（400）的高度位置的下阶段（H k ）升降台（400）布置在多个平台的高度位置中不是最下层的高度位置（H k ）.;选定的图纸：图10;版权：（C） 2019年，JPO＆INPIT
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