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    • 19. 发明专利
    • DE1523941A1
    • 1969-06-26
    • DE1523941
    • 1967-02-28
    • ITALORA SPA
    • NEGRI EMILIOCASSERA GIORGIO
    • G04C3/06G04C3/04
    • 1,140,317. Electric clocks. ITALORA S. p. A. Feb.24, 1967 [Dec.5, 1966], No.9008/67. Heading G3T. An electromagnetic driving and regulating device for a clock comprises at least four magnetic poles 5 and at least two coils 6, 7 connected to an electronic amplifier Atr. The coils 6, 7 are stationary whilst the magnets are attached to one of the two discs 3 comprising the balance wheel. The discs 3 are connected by a cylinder (4), Fig. 2 (not shown), both the discs and the cylinder being made of a material of high magnetic permeability. The arrangement of the six poles 5 is such that during each complete oscillation, two pulses are induced in each coil as the balance wheel passes through its rest position. However the pulse induced during the clockwise oscillation is of opposite sign to the pulse induced during the reverse oscillation so that one of the pulses will not trigger a transistor in the amplifier Atr. The amplifier may include an NPN and a PNP type transistor, in which case both pulses may be used as driving pulses. In modifications four and eight magnetic poles are used and the magnetic poles may be formed by radially polarizing the balance wheel.