| 摘要 |
PURPOSE:To promote standardization and combined use of parts with an easy construction of 2-hand movement wheel train permitting a stepped hand work at an interval of more than 2sec. by varying the gear ratio and the position of a slip section only with a minimized loss by devising the gear ratio and the position of the slip section in the conventional wheel train construction susceptible to a load. CONSTITUTION:Numeral 33 indicates a fourth wheel having a gear 33a with 60 teeth and a pinion 33b with 10 teeth is meshed with a third gear 34a. A rather big shaft 33e is provided at the bottom of the fourth pinion 33b with the central hole 35f of a minute wheel 35 as bearing. Numeral 34 indicates a third wheel and a spring section 34c is formed on the third gear 34a with 40 teeth to grasp a shaft 34d elastically, generating a fixed slip torque. A pinion 34b with 20 teeth is meshed with a minute gear 35a. Numeral 35 indicates a minute wheel having a gear 35a with 30 teeth and a minute hand is mounted at the tip thereof. The wheel train construction following the minute wheel 35 is the same as that in the past but different in the driving torque. |
