Timepiece movement with differential gear mechanism

Details Timepiece movement with differential gear mechanism Timepiece movement with differential gear mechanism

1979-08-27

1981-03-31

Weldon, Ulysses

Horology: time measuring systems or devices

With calendar indicator

Setting or resetting

368 35, 368185, 368190, 368197, G04B 1924

Patent

active

042597358

ABSTRACT:
In a timepiece movement, more particularly a quartz wrist watch movement, having a low-torque stepping motor, there is provided a differential mechanism which drives the hands and makes it possible to move the hour-hand alone in jumps. A cannon-pinion having a toothing acts as a sun gear. A planet gear is mounted on an hour-wheel which acts as a planet carrier. A ring gear takes the form of an annulus having internal teeth which is normally stationary but is controlled by a stem and can be rotated by jumps to cause the planet gear to roll along the cannon-pinion toothing, thus causing the planet carrier and consequently the hour hand to jump.

REFERENCES:
patent: 3633354 (1972-01-01), Stemmler
patent: 3747329 (1973-07-01), Golay

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