| 摘要 |
When the driving of a driving unit is stopped, a first gear and a second gear restrict the rotation of a final output gear in both directions. With this arrangement, it becomes possible to securely prevent the occurrence of rattling during rotation of a final output shaft due to backlash of the gears. Further, a unit that applies a torque of constant strength to the final output shaft becomes unnecessary. Consequently, it becomes possible to make compact a power transmission mechanism, and it also becomes possible to reduce cost.
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