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Speed and direction sensing circuit

  • US 4,331,917 A
  • Filed: 12/13/1979
  • Issued: 05/25/1982
  • Est. Priority Date: 12/13/1979
  • Status: Expired due to Term
First Claim
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1. Apparatus responsive to substantially continuous motion of a part (10) to determine the direction of motion of said part comprising:

  • sensor means (14) operatively associated with the part (10) for generating first and second phase shifted signals (A, B);

    each of said first and second signals comprising a recurring series of opposite signal levels which occur at a rate dependent upon the speed of part motion relative to the sensor means (14);

    decoder means (20) having a pair of inputs (A, B) and a plurality of discrete outputs (S0, S1, S2, S3), said outputs being activated in a sequence dependent upon the signal levels applied to the inputs (A, B);

    said inputs (A, B) receiving the first and second signals (A, B) and producing a decoder output sequence which progresses according to the direction of motion of the part (10);

    up/down counter means (42,

         44) having clock and direction inputs;

    and logic means (26, 28, 30, 32, 34, 36, 38,

         40) connecting the outputs of the decoder to the inputs of the counter means to clock the counter only after the completion of a full sequence and in a direction determined by the order of said sequence.

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