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Control apparatus and method

  • US 4,725,010 A
  • Filed: 02/04/1987
  • Issued: 02/16/1988
  • Est. Priority Date: 07/18/1986
  • Status: Expired due to Term
First Claim
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1. A method for correcting a reversal point signal for a traverse mechanism for guiding a strand from a rotating reference wheel back and forth between reveral points in end flange surfaces of a rotating spool to form a helical winding in successive layers onto a barrel of the spool, comprising the steps of:

  • sensing the angular velocity of the reference wheel and providing a reference wheel signal having a magnitude indicative thereof;

    sensing the angular velocity of the spool and providing a spool signal indicative thereof;

    providing a wheel radius signal having a magnitude indicative of the radius of the reference wheel;

    determining the actual radius from the spool'"'"'s rotation axis of the topmost layer on the barrel at a selected reference point between the spool'"'"'s flanges by dividing the magnitude of said reference wheel signal by the magnitude of said spool signal to obtain a first ratio signal and multiplying the magnitude of said first ratio signal by said wheel radius signal and providing an actual topmost layer radius signal;

    determining proper topmost layer radius from the spool'"'"'s rotation axis at a rversal point by determining the point of intersection of a line parallel to the spool barrel and lying in the actual topmost layer, as indicated by the magnitude of said actual topmost layer radius signal, and a fixed line lying in the flange surface corresponding to said reversal point and provindg a proper topmost layer radius signal having a magnitude indicative of said proper topmost layer radius;

    determining the actual reversal point topmost layer radius at said reversal point by dividing the magnitude of said reference wheel signal by the magnitude of said spool signal to obtain a second ratio signal and multiplying the magnitude of said second ratio signal by the magnitude of said wheel radius signal to obtain an actual reversal point topmost layer radius signal; and

    comparing the magnitude of said proper topmost layer radius signal to the magnitude of said actual reversal point topmost layer radius signal and altering the reversal point signal by a selected incremental amount in the presence of a difference in magnitudes.

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