| 摘要 |
A drive unit for a copying machine comprises a motor for driving a photoconductive drum, the developing rollers, the fixing rollers, and a cooling fan. When a copying operation takes place, the motor is rotated in the forward direction, whereby the drum and the other components are driven simultaneously. At this time, a cleaning blade is brought into contact with the drum, thereby removing residual toner therefrom. After completion of the copying operation, the cleaning blade is disengaged from the drum, and the motor is reversed. At this time, by means of a one-way clutch, only the drum is allowed to rotate in the reverse direction. After the drum is rotated reversely through a predetermined angle, only the cooling fan is allowed to operate, this being due to the action of a dog clutch.
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