| 摘要 |
A cylindrical worm 25 is attached to an output shaft of a motor, a first worm wheel 26 and a second worm wheel 27 are disposed on both the sides of the axial center of the cylindrical worm 25 , the first worm wheel 26 and a wire drum are supported by a first support shaft 28 , and the second worm wheel 27 and a swing arm are supported by a second support shaft 32 . A first clutch is interposed between the first worm wheel 26 and the wire drum, a second clutch is interposed between the second worm wheel 27 and the swing arm, and the swing arm and the wire drum are rotated by controlling the first and second clutches with the motor rotating continuously.
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