Horology: time measuring systems or devices – Chronological – With mechanical or electromechanical driven display
Patent
1991-11-21
1995-03-28
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With mechanical or electromechanical driven display
368165, 368179, 368223, G04B 1900, G04B 1702, G04F 500
Patent
active
054023955
ABSTRACT:
A driving device has a stepping motor for reciprocatively rotationally driving a decorative rotary member. A memory circuit stores a data table on the basis on which the operation timing of the stepping motor is determined. A control circuit controls the application of actuation pulses to the stepping motor on the basis of the data stored in the memory circuit. The data table is made up of numeric values representative of the inter-pulse spacing of the actuation pulses, the inter-pulse spacing being selected such that the rotational speed of the rotary decorative member varies in conformity with a sine curve or the rotation angle of the decorative rotary member varies in conformity with a secant function.
REFERENCES:
patent: 3990226 (1976-11-01), Fehrenbacher
patent: 4038588 (1977-07-01), Woolfson et al.
patent: 4482260 (1984-11-01), Fehrenbacher
patent: 4899324 (1990-02-01), Barbieri et al.
patent: 4985877 (1991-01-01), Namisato
patent: 5151886 (1992-09-01), Miyazawa
patent: 5195063 (1993-03-01), Moriya
Ohshima Kenji
Shinmyo Susumu
Urabe Takuo
Adams Bruce L.
Miska Vit W.
Seikosha Co. Ltd.
Wilks Van C.
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