| 摘要 |
PURPOSE:To enable selective transmission of a power to 2 systems of wheel trains, by shifting rotation of a worm between a forward and a reverse direction. CONSTITUTION:With a driving motor 1 forward rotated as shown by an arrow mark (a), a worm 5 is located in a first position and geared with a first worm gear 6 to drive the gear 6 in the direction of an arrow mark (c). Meanwhile, the motor 1 shifted to a direction reverse to the arrow mark (a), the worm 5 is rotated in a direction shown by an arrow mark (b), the first worm gear 6 is forced to rotate in the direction reverse to the arrow mark (c), but, since the gear 6 is checked through the force of a leaf spring 8, the gear is prevented from rotation, the worm 5 is moved leftward from the first worm gear 6, and is moved to a second position. In which case, the worm 5 is geared with only a second worm gear 9 to drive the gear 9 in the direction of an arrow mark (d). The first and second worm gears 5 and 9 are respectively coupled to 2 systems of wheel trains.
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