Single-coil balance wheel for driving a mechanical movement

Details Single-coil balance wheel for driving a mechanical movement Single-coil balance wheel for driving a mechanical movement

1980-04-24

1982-07-20

Miska, Vit W.

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

368161, 318127, G06F 104, H02K 3310

Patent

active

043409482

ABSTRACT:
A timepiece including a mechanical movement is disclosed and a movable system for driving the movement. The movable system includes a balance wheel formed by a pair of plates and a magnetic member mounted on each plate. The magnetic members include a magnetic north and south pole arranged to provide a magnetic field. A coil is disposed in position so that its winding may be swept with the magnetic field which induces a voltage to which a circuit is responsive to develop a feedback signal to be applied across the winding to add energy to the movable system in replacement of energy losses of friction, and so forth. A feedback signal is developed if the movable system is sweeping the coil briskly. If movement of the movable system is not brisk, or the movable system has stopped, then a start pulse is developed for self-starting. The start pulse is normally prevented by the feedback signal which also serves as a reset signal to reset a start signal counter before completion of a counting operation. The circuit is controlled by an oscillator which opens and closes a gate to prevent creation of a closed loop.

REFERENCES:
patent: 3046460 (1962-07-01), Zemla
patent: 3618311 (1971-11-01), Wiesner et al.
patent: 3787715 (1974-01-01), Eaton, Jr.
patent: 3806781 (1974-04-01), Berney
patent: 3921386 (1975-11-01), Keller
patent: 3952497 (1976-04-01), Schulz et al.

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