| 摘要 |
A post-processing device includes a sheet-bundle forming unit that stacks plural sheets and forms a sheet bundle; a binding unit that forms a cut and a tongue in the sheet bundle and binds the sheet bundle by inserting the tongue into the cut; a transport unit that transports the sheet bundle; and a stack unit that stacks the sheet bundle. The binding unit includes first and second binding mechanisms that bind first and second sheet bundles at first and second sides in a direction intersecting with a transport direction of the sheet bundle, respectively. The post-processing device further includes an arrangement mechanism that arranges the first and second sheet bundles at different positions on the stack unit in the direction intersecting with the transport direction so that a tongue formed in one of the first and second sheet bundles is shifted from the other sheet bundle.
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