Three hand movement for a timepiece having a stepping motor

Details Three hand movement for a timepiece having a stepping motor Three hand movement for a timepiece having a stepping motor

1989-01-30

1989-12-19

Roskoski, Bernard

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

368160, G04F 500

Patent

active

048887498

ABSTRACT:
An improved movement for a three hand quartz analog timepiece having a frame, a stepping motor with the motor pinion adapted to step once per second, and a plurality of coaxial output members rotatably mounted in the frame including a spindle for driving a "seconds" hand and having a toothed seconds wheel driven by a two-pin rotor pinion, a two-pin reduction drive pinion connected to the spindle, a coaxial sleeve having a toothed minutes wheel and a coaxial sleeves having a toothed hours wheel. The improvement comprises a dual reduction gear assembly with a single shaft rotatably mounted in the frame having a toothed third wheel driven by the reduction drive pinion and having a first reduction pinion and a second reduction pinion directly driving the hours and minutes wheel, respectively, from the same shaft. The first reduction pinion is the two-pin type and the second reduction pinion is a spur gear.

REFERENCES:
patent: 4426158 (1984-01-01), Muller et al.
patent: 4483627 (1984-11-01), Muller et al.
patent: 4647218 (1987-03-01), Wuthrich

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