| 摘要 |
A sheet aligning device includes a sheet feeder that discharges a sheet in a first direction, a sheet tray on which the sheet is stacked, a sheet jogger that aligns the sheet on the sheet tray in a second direction perpendicular to the first direction, and a sheet detection filler that detects a state of the sheet on the sheet tray. The sheet detection filler detects a position of a topmost sheet in the stack of sheets on the sheet tray and determines an alignment position from where the sheet jogger is to begin alignment of the sheets.
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