| 摘要 |
A stepping mechanism comprising a motor, a motor gear connectable to the motor and rotatable by the motor, a first one-way clutch and a second one-way clutch when the motor rotates the gear in a first direction so as to operate the first one-way clutch in a first mode and the motor rotates the gear in the second direction so as to operate the second one-way clutch in a second mode, wherein the first and second one-way clutch do not operate at the same time.
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