| 摘要 |
A common drive unit which supplies torque to a conveyor and a stacking device of a sheet reading apparatus, e.g., a banknote reader, comprises at least two motors and two couplings. The conveyor conveys sheets past a testing device installed between an input channel and the stacking device for the recognition of sheet characteristics. A control device decides on the basis of signals received from the testing device on the acceptance or rejection of the tested sheet, and controls the motors and the couplings to effect same. The torque of the two motors is transmitted as required to a drive axle of the conveyor or to a gear box of the stacking device. To convey the sheet to the stacking device, both motors are coupled to the drive axle of the conveyor, while at least the torque of the first motor acts upon the drive axle if the sheet is to be ejected. If the sheet is accepted, the second coupling connects the second motor to the gear box of the stacking device for stacking the sheet.
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