| 摘要 |
<p>PURPOSE:To reduce the load of a motor by pivoting the shaft of a mobile gear comprising small-sized and large-sized middle gears at an arc-shaped long hole, and what is more by pressure-supporting the shaft with an elastic member having a recessed part and changing the position symmetrically based on a normal/reverse motion of a motor. CONSTITUTION:Arc-shaped long holes 13 and 14 are installed to a base plate 1 and a cover plate 2 and a rotary shaft 15 of a middle mobile gear 10 comprising a large-sized gear 11 and a small-sized gear 12 is pivoted while the rotary shaft 15 is supported with a pressing member 18 having a flat and disk-shaped recessed part 20. A gear 6 is rotated in the direction of (a) by driving a motor 4, then a lever 7 engaged with the small gear 12 is rotated until it comes in contact with a stopper 22 and then locked. When the motor is further rotated, the shaft 15 moves along the long holes 13 and 14 and the shaft 15 is disengaged with the lever 7 and idled even if a rotary operation member 9 is manually rotated. When is unlocked, the motor 4 is rotated counterclockwise. When it is locked, the reverse operation is carried out. This construction makes it possible to reduce the load of the motor and make compact the size of the motor.</p> |
