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Apparatus for optically monitoring and controlling a moving fiber of material

  • US 5,380,366 A
  • Filed: 04/22/1993
  • Issued: 01/10/1995
  • Est. Priority Date: 11/04/1991
  • Status: Expired due to Fees
First Claim
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1. A dispensing system comprising:

  • a dispensing means having a discharge opening for dispensing a fiber of material and a means for causing the dispensed fiber of material to propagate in a moving pattern through a space between the discharge opening and a substrate;

    a transmitting means for transmitting a beam of light;

    a receiving means, aligned with the beam of light for generating a signal in response thereto, and the transmitting and receiving means positioned such that under normal operating conditions, the fiber of material will pass through the beam of light at least twice as it propagates in the moving pattern;

    a means, responsive to the signal generated by the receiving means for generating an edge signal when an edge of the fiber bears a predetermined relationship to the beam of light;

    a means for generating a symmetry signal indicative of, or proportional to, either a time interval between a first said edge signal and a second edge signal or a time interval between the second said edge signal and a third edge signal;

    a means, generating a period signal indicative of, or proportional to, the time interval between said first edge signal and said third edge signal; and

    a means, responsive to said period and symmetry signals for determining a motion status of the pattern.

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