| 摘要 |
PURPOSE:To perform sure correction of date dial by turning the date dial which is subjected to month end automatic correction by a step motor, through external operation while correcting its position with a cam or the like by changing wheel train. CONSTITUTION:At normal times, a date dial 613 is turned by a step motor via control part which has date-, month, year counters and a month end discriminating circuit by an AM zero hour signal. When a crown 419 is pushed and turned, turning of a gear 43 by a clutch wheel 420, etc. is transmitted to the wheel train which is changed over by the driving transmission change device of a differential mechanism formed by stationary gears 416c, 810, rotating gear 416a, sun gear 416d, planetary gear 416b of the gear 416a, etc. The date dial 613 is then corrected by the gear 810. Unnecessary turning of the date dial 613 at the impact is prevented by the cam 425 of this gear 43 and a position defining lever 426. |
