| 摘要 |
PURPOSE:To obtain a power generating set which is excellent in impact resistance and small in size, and can be loaded on a wrist watch, by providing at least one piece of mechanism for transferring power by frictional force, on a power transfer part of a rotary weight. CONSTITUTION:A rotary weight 2 is attached with a clearance between a wheel train receiver 1 and a screw 3 fixed to said receiver, and a rotary weight gear 5 is attached to the weight 2 by arbitrary frictional force. Accordingly, by the motion of an arm or actual force, the weight 2 rotates freely, and this rotation is transmitted to the gear 5 by frictional force between the weight 2 and the gear 5, and its speed is increased through an intermediate gear 7 to transmit to a rotor 8. In the periphery of the rotor 8, a stator 9 is placed, and by a variation of a magnetic flux due to the rotation of the rotor 8, power generated in a coil is supplied to a timepiece mechanism including an electronic circuit. The frictional force between the weight 2 and the gear 5 is made larger than a load portion by magnetic force generated in the rotor 8 and the stator 9, and a mechanical load such as friction of the wheel train part at a usual time, and made smaller than a load by magnetic force which becomes large by an electromagnetic induction action and a mechanical load, at the time of an impact.
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