| 摘要 |
A sheet processing apparatus includes a sheet-table unit, a sheet-separating unit, a convey unit, a discharge unit, a sheet processing unit, and a sensor arranged at an upstream end of the convey unit and spaced from the discharge unit with a predetermined distance. The convey unit has at least one convey roller, at least one convey pulley, and an elastic device connected with the convey pulley. The elastic device has a stepping motor, a transmission system, a shaft and at least one torsional spring mounted on the shaft. Two ends of the torsional spring is connected with the convey pulley. When the signal resulted from a rear end of the sheet apart from the sensor is sent to the system controller, the stepping motor is commanded by the system controller to rotate the shaft. The torsional spring is twisted to make the convey pulley move away from but still contact with the convey roller.
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