| 摘要 |
A sheet processing apparatus comprises a center-stapling mean, a center-folding mean, and a stacking tray for stacking a discharged sheet or sheet bundle, staples at the center of a sheet bundle conveyed from a sheet output apparatus with the center-stapling mean, folds the stapled sheet bundle into two with the center-folding mean, and discharges the sheet bundle to stack on the stacking tray. Folding rollers 451 and 452 discharge the sheet bundle folded into two by the center-folding mean from the side folded into two. In this state, an opening/closing end fence 311 orients a discharging direction of sheet bundle folded into two downward in vertical direction, turns over the sheet bundle, and stacks the sheet bundle on a tilted lower side stacking tray 301.
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