| 摘要 |
PURPOSE:To achieve small and thin size, by assembling train wheels of a watch into one shaft, by using a differential gear mechanism. CONSTITUTION:A bearing 23 for a minute hand shaft 22 is fixed to a main plate 21. A minute hand gear 24 is fixed to the shaft 22, and the shaft 22 is supported freely rotatably between the bearing 23 and an hour hand wheel 26 supported to a train wheel bearing 25. The rotating movement from a drive gear 28 is delivered to the gear 24 and an hour intermediate gear 27, and the minte hand gear 24 turns the shaft 22 and drives the minute hand fixed at the tip of the shaft 22. On the other hand the rotating movement of the gear 27 turns a planet gear 29 and turns the hour hand fexed to the tip of the wheel 26 together with the movement of the planet gear 29 turning around the wheel 26 with the gear 24. |
