Switching mechanism of an electronic wrist watch

Details Switching mechanism of an electronic wrist watch Switching mechanism of an electronic wrist watch

1976-12-28

1977-08-30

Weldon, Ulysses

Electricity: circuit makers and breakers

Multiple circuit control

Pivoted contact

58 855, 58 63, 200 52R, 200153P, 200153V, G04C 300

Patent

active

040445437

ABSTRACT:
The switching mechanism for setting the time in an electronic wrist watch comprises a switch blade actuated by a double-lobe cam which is connected by a lost-motion coupling with a coaxial transmission wheel having at its periphery gear teeth meshing with a winding pinion on a round part of the winding stem which is perpendicular to the axis of the transmission wheel and cam. The winding pinion and a clutch wheel which is rotatable with the winding stem have rectangular teeth which are engageable with each other to connect the winding pinion with the winding stem. A protuberance of a cam spring is engageable with one lobe of the cam to restrain rotation of the cam until the lost-motion coupling reaches the end of its travel. The construction permits its use in a thin watch.

REFERENCES:
patent: 3762153 (1973-10-01), Komiyama et al.
patent: 3796038 (1974-03-01), Ushiyama
patent: 3841081 (1974-10-01), Komaki
patent: 3945190 (1976-03-01), Kimura et al.

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