| 摘要 |
PURPOSE:To improve space efficiency and to stabilize rotating speed by providing both of a speed-increasing wheel train means and speed-reducing wheel train means for transmitting the revolutions of a rotor which changes the surface waves generated by piezo-electricity to rotating motion. CONSTITUTION:A second wheel 5 is fixed with a second hand 6 and engages with a rotor wheel 4 to form the speed-increasing wheel train. A minute wheel 7 is fixed with a minute hand and engages with the wheel 4 to form the speed- reducing wheel train. An hour wheel 9 is fixed with an hour hand 10 and an intermediate wheel 11 determines the rotating ratio of the hour wheel 9 and the minute wheel 11. Since the rotor wheel 4 has the gear for increasing and decreasing the speed in the above-mentioned manner, the space efficiency is improved and this wheel train is made helpful for the reduction of thickness. |
