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US 4,659,027 AGranted
Method and apparatus for winding textile yarns
AssigneeBarmag Barmer Maschinenfabrik AG
InventorsHeinz Schippers, Friedhelm Lenz
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AssigneeBarmag Barmer Maschinenfabrik AG
InventorsHeinz Schippers, Friedhelm Lenz
Estimating the term…
A method and apparatus for winding textile yarns into core supported packages is disclosed, and which is characterized by the ability to produce relatively large packages which are adapted to permit a high speed unwinding by withdrawal of the yarn over one end of the package. The method and apparatus involves controlling the yarn traverse guide so as to include stroke modification cycles during which the traverse stroke is progressively contracted and then increased, with the stroke modification cycles being designed to produce a precisely cylindrical package end with a uniform distribution of hardness along the package. In one illustrated embodiment, a number of stroke modification cycles having a relatively large contraction alternate with a number of stroke modification cycles having a relatively small contraction. In addition, the speed of the yarn guide may be constantly accelerated and decelerated to avoid undesirable patterns, with the changes in speed being coordinated with the stroke modification cycles to provide a uniform yarn tension in the package.
In a method of winding textile yarns into core supported packages in which the yarn is wound about the core at a substantially constant speed while the yarn is guided onto the core by a traversing yarn guide, the improvement therein comprising controlling the traverse of the yarn guide at at least one end of the package in a recurrent series of yarn deposit intervals, with each interval comprising at least two segments, with the first segment including at least one stroke modification cycle which includes the steps of progressively decreasing the length of the strokes of the yarn guide to a relatively large contraction and then progressively increasing the length of the strokes, and with the second segment including at least one stroke modification cycle which includes the steps of progressively decreasing the length of the strokes of the yarn guide to a relatively small contraction and then progressively increasing the length of the strokes, and with the relatively small contractions of the second segments being less than about 60 percent of the relatively large contractions of said first segments.
An apparatus for winding textile yarns into core supported packages including means for rotating the core to wind the yarn thereabout at a substantially constant rate, yarn guide means movable axially with respect to the core for guiding a running yarn onto the core, and means for traversing said yarn guide means, the improvement therein comprising control means operatively connected to said traversing means for controlling the traverse of the yarn guide at at least one end of the package in a recurrent series of yarn deposit intervals, with each interval comprising at least two segments, with the first segment including at least one stroke modification cycle in which the length of the strokes of the yarn guide is progressively decreased to a relatively large contraction and then progressively increased, and with the second segment including at least one stroke modification cycle in which the length of the strokes of the yarn guide is progressively decreased to a relatively small contraction and then progressively increased, and with the relatively small contractions of the second segments being less than about 60 percent of the relatively large contractions of said first segments.
Dependencies are inferred from the claim text.