Horology: time measuring systems or devices – Chronological – With mechanical or electromechanical driven display
Patent
1979-03-14
1981-07-07
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With mechanical or electromechanical driven display
368155, 310 49R, G04B 1920, G04C 1500, H02H 3717
Patent
active
042778417
ABSTRACT:
A stepping motor (44) for use in and in combination with an elapsed time indicator (10) of the type including a plurality of indicator drums (102, 104, 106 and 108) and a drive train (FIG. 3) driven by the motor for driving the indicator drum (102). The motor includes a rotor (56) and a stator providing a pair of stator poles (50, 52) including a notch (94, 96) in respective poles faces. The notch creates a pair of pole faces, one of major length and the other of minor length in each stator pole. In a non-current condition, the rotor seeks a dwell or detent position rotationally toward the pole face of greater concentration of iron. When the winding (54) is pulsed, the rotor, within at least the second pulse, moves unidirectionally and between pulses locates a further dwell or detent position. An indicator (154) including a flag (156) is controlled in movement by the motor so that the flag is moved into and out of a viewing window (40) to indicate motor operation.
REFERENCES:
patent: 2353670 (1944-07-01), Johnson
patent: 3132558 (1964-05-01), Wymann
patent: 3370189 (1968-02-01), Haydon et al.
patent: 3495107 (1970-02-01), Haydon
patent: 3754391 (1973-08-01), Fujita
patent: 3878414 (1975-04-01), Harakawa
patent: 3908353 (1975-09-01), Graziano
patent: 3978651 (1976-09-01), Yoshino
patent: 4004168 (1977-01-01), Haydon
patent: 4047375 (1977-09-01), Wulff
patent: 4088909 (1978-05-01), Matsumura et al.
patent: 4162418 (1979-07-01), Kawaki et al.
General Time Corporation
Miska Vit W.
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