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Sheet feeder synchronization system having error correction means

  • US 4,835,698 A
  • Filed: 07/07/1987
  • Issued: 05/30/1989
  • Est. Priority Date: 07/07/1987
  • Status: Expired due to Term
First Claim
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1. A method for measuring a series of predetermined lengths along a web moving past a stationary location to enable registered positioning of at least one repetitive operation on the web in accordance with said predetermined lengths, the method comprising the steps of:

  • generating a data signal in response to rotation of an element synchronously with any advance of the web past said stationary location, said data signal including a series of count pulses, each of said pulses corresponding to identical increments of rotation;

    converting a first of said predetermined lengths to a first real number of said increments;

    adjusting said first real number to an adjacent first integer number of said increments;

    determining a first error amount resulting from said adjusting;

    defining a first of said lengths along the web as corresponding to advance of the web past said stationary location sufficient to cause generation of said signal so as to include said first integer number of said count pulses within said data signal;

    converting a second of said predetermined lengths to a second real number of said increments;

    adjusting said second real number to an adjacent second integer number of said increments;

    determining a second error amount resulting from said adjusting;

    adding said second error amount to said first error amount to produce a cumulative error amount;

    in the event said cumulative error exceeds one, incrementing said second integer number to an adjacent corrected second integer number and decreasing said cumulative error amount by one; and

    defining a second of said lengths along the web as corresponding to further advance of the web past said stationary location sufficient to cause generation of said signal so as to include said corrected second integer number of said count pulses within said data signal.

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