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Reversal preventing device of electric clock

  • US 4,104,859 A
  • Filed: 05/13/1976
  • Issued: 08/08/1978
  • Est. Priority Date: 05/14/1975
  • Status: Expired due to Term
First Claim
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1. In an electronic timepiece, the combination comprising:

  • a stepping motor having a rotor which intermittently rotates in one direction through a predetermined angular interval to a rest position;

    a rotary driving member driven by said rotor to rotate in one direction during rotation of said rotor and which may develop an oscillation about a rest position after said rotor has rotated through the predetermined angular interval;

    indicating means including an indicator which changes position for visually indicating the value of a variable;

    a rotary driven member for driving said indicating means to change the indicator position;

    said rotary driving member and said rotary driven member together include coupling means for coupling said driving member with said driven member to rotate said driven member in a forward direction as said driving member rotates through a middle portion of its interval of angular rotation, and for disengaging said driving member from said driven member after said driving member has rotated through a middle portion of its interval of angular rotation so that said rotary driven member is intermittently rotated by said rotary driving member to intermittently change the position of said indicator; and

    means for preventing said driving member from rotating said driven member in a reverse direction by oscillation of said driving member at the end of the interval of rotation of said driving member.

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