| 摘要 |
<p>PURPOSE:To attain reduction in cost. CONSTITUTION:A driving lever 51 is pressed by a tension coil spring 56 in the direction engaging a connection gear 48 with a 1st gear 34 and a 2nd gear 37, and also it is pivotally supported at such a position that the connection gear 48 is rotated in the direction separating from the 1st gear 34 and 2nd gear 37 against a repulsive force of the tension coil spring 56. Therefore, even though an excessive torque exerts on a rotary dial 25 at the time of shuttle mode for engaging the connection gear 48 with the 1st gear 34 and 2nd gear 37, a part of this torque can be released by the rotation of the driving lever 51. Consequently, a high strength material for the gear like in the conventional practice is unnecessary, and the degree of freedom in the case of selecting the materials of components is improved.</p> |
