| 摘要 |
A sheet post-processing apparatus includes plural trays arranged along a sheet conveyance direction, wherein a sheet is stacked, bridging between the plural trays, wherein a post-processing is effected to the sheet in a part of the plural trays; a controller for controlling the trays to provide a level difference between the trays by lowering another one of the trays than the one of the trays; and aligning device for laterally aligning the sheet stacked, bridging between the trays providing the level difference.
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