| 摘要 |
A sheet post-processing apparatus includes a pair of sheet feeding rollers for receiving the sheet supplied from an image forming apparatus and conveying it to the downstream side, a stand-by tray for receiving the delivered sheet and an assist arm arranged at the sheet delivery side of the pair of sheet feeding rollers and adapted to turn. The assist arm turns, utilizing the rotary force of a motor that is adapted to rotate both forwardly and backwardly, so as to press the rear end of the sheet delivered from the pair of sheet feeding rollers against the stand-by tray when the motor is driven backwardly.
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