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Apparatus for feeding a web

  • US 5,768,959 A
  • Filed: 06/11/1997
  • Issued: 06/23/1998
  • Est. Priority Date: 07/31/1995
  • Status: Expired due to Term
First Claim
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1. Apparatus for feeding a web having two portions in a path of travel, comprising:

  • a first module including means for feeding the two web portions in side-by-side relationship;

    a second module located downstream in the path of travel from said first module, said second module including means for feeding the two web portions in upper-lower relationship where the two web portions each form a loop between said first module and said second module so as to reorient from side-by-side to upper-lower relationship;

    sensor means for detecting the presence of one of the two web portion loops; and

    control means including means operatively connected to said second module for determining the feed speed of said second module feed means, said control means operatively connected to said sensor means and said second module feed means for setting the feed speed of said first module feed means corresponding to the feed speed of said second module feed means, said determining means including encoder means for providing a plurality of encoder pluses indicative of the feed speed of said second module feed means;

    said control means further for measuring an interval of time between successive encoder pulses;

    wherein, for a first time interval within a first predetermined range of intervals, said control means sets the feed speed of said first module to a first corresponding value if the one loop is present and to a second corresponding value if the one loop in not present; and

    for a second time interval within a second predetermined range of intervals different from said first predetermined range of intervals, said control means sets the feed speed of said first module to said first corresponding value if the one loop is present and to a third corresponding value different from said second corresponding value if the one loop is not present.

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