Driving mechanism of a member of timepiece moving intermittently

Details Driving mechanism of a member of timepiece moving intermittently Driving mechanism of a member of timepiece moving intermittently

1976-09-07

1978-05-09

Schaefer, Robert K.

58 58, 58 1M, G04B 1500

Patent

active

040879593

ABSTRACT:
A crown ring for a date indicator is moved once during each revolution of a continuously rotating plate or driving member, which plate has a cam-shaped member of magnetic material that rotates with it and cooperates with a magnet in order to substantially eliminate the variations in torque required to rotate the plate. To this end, the profile of the cam-shaped member is such that during the portion of each revolution of the plate when the crown is moved, the surface of the cam comes rapidly closer to the magnet increasing the pull of the magnet on it, and during the remainder of each revolution, it recedes. The magnet, therefore, helps to rotate the plate when the crown is being moved in order to offset the torque required to move the crown, while placing only a slight drag on the plate during the balance of each revolution of the plate.

REFERENCES:
patent: 2964901 (1960-12-01), Betner et al.
patent: 3036424 (1962-05-01), Perrot
patent: 3815351 (1974-06-01), Vouelle
patent: 3969888 (1976-07-01), Jeuilleumiel et al.
patent: 3993895 (1976-11-01), Baermann

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