Reversal preventing device of electric clock
First Claim
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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Accused Products
Abstract
A driving wheel is mounted on the output shaft of a step motor, and a driven wheel engaging with gear wheels on which pointers are set is driven by said driving wheel. The driving wheel and the drive wheel have respective peripheral portions effective to couple the driving wheel with the driven wheel to rotate the driven wheel as the driving wheel rotates of an angular interval of rotation, and for thereafter disengaging the driving member from the driven member.
In order to fix the position of a pointer after the driving wheel has finished rotating the driven wheel, the reversal preventing mechanism acts on the said driven wheel or the driving wheel. The driving wheel is driven by a stepping motor having a rotor which intermittently rotates in one direction through a predetermined angular interval to a rest position. The driven wheel is in turn intermittently rotated by the driving wheel to intermittently change the position of the pointer.
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Citations
6 Claims
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1. In an electronic timepiece, the combination comprising:
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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; andmeans 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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification