Method of winding yarn on a bobbin or the like in a stepwise high precision winding process
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United States of America Patent
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-
Sep 5, 1995
Grant Date -
N/A
app pub date -
Jul 2, 1993
filing date -
Jul 17, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The stepwise high precision winding method includes winding the yarn on the bobbin with a reciprocating yarn changing guide in a series of steps so that an outer circumferential speed of the yarn-bobbin package is constant; reducing the yarn guide reciprocation frequency in each step from a starting frequency value to a final frequency value while keeping a winding number constant during each step so that the final frequency value is proportional to a bobbin rotation frequency in each step, and then increasing the yarn guide reciprocation frequency discontinuously to another starting frequency value and beginning a following step with the yarn guide reciprocation frequency equal to the other starting frequency value; setting the starting frequency value in each step to not more than a fixed maximum frequency; setting the final frequency value in each step to not less than a certain fixed minimum frequency; and setting the winding number in the Sth step equal to either i.sub.S -i.sub.S x/(M.sub.S +x) or i.sub.S +i.sub.S x/(M.sub.S -x), wherein x=a/2H; i.sub.S is a mirror value for the Sth step, M.sub.S is the order of the mirror value for the Sth step, a=the lay spacing between windings of a Kth lay and a (K+M.sub.S)th lay and H is a total height of the yarn-bobbin package.
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