| 摘要 |
PURPOSE:To transmit revolutions surely and to eliminate hunting of the hands by transmitting the revolutions by means of the magnetic attraction forces of magnetic coupling mechanisms and the projections and recesses to be brought into elastic contact with each other by the magnetic attraction forces. CONSTITUTION:When the rotor 4 of a motor 1 is revolved by the pulses from a master watch, the revolutions thereof are transmitted to a rotor pinion 4a and a center wheel 8 and a minute hand driving axle 7 is rotated one turn in an hour. The revolutions of the axle 7 are transmitted via a magnetic coupling mechanism 11 to a minute hand axle 10 which rotates a minute hand 10b one turn in an hour. On the other hand, the revolutions of the axle 7 are transmitted from a minute hand pinion via an intermediate wheel 19 and an intermediate pinion 20 to an hour wheel 21. The revolutions of the wheel 21 are transmitted via a magnetic couling mechanism 22 to an hour hand pipe 24. In the ordinary hand operation, the revolutions are transmitted by the attraction forces of the magnetic couplings 11, 12 and the projections 16, 28 and recesses 17, 29 which are brought into elastic contact with each other by these magnetic attraction forces. |
