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Control system for an unwinding roll

  • US 4,151,403 A
  • Filed: 10/05/1977
  • Issued: 04/24/1979
  • Est. Priority Date: 10/05/1977
  • Status: Expired due to Term
First Claim
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1. Apparatus for determining the length of web remaining on an unwinding roll, comprising:

  • first means for generating a train of digital pulses representative of the length of web unwound per revolution of the roll;

    second means for monitoring the number of revolutions of the roll;

    third means operatively associated with said first and second means for accumulating successive counts of said pulses over a predetermined number of revolutions of the roll;

    fourth means operatively associated with said first, second and third means for computing the average change in the number of said pulses generated per revolution of the roll over a predetermined number of revolutions of the roll and for computing the length of web remaining on the roll after each revolution thereof based on said computed average change and the accumulated counts of said pulses.

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