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US 4,504,024 AGranted
Method and apparatus for producing ribbon free wound yarn package
AssigneeBarmag Barmer Maschinenfabrik AG
InventorSiegmar Gerhartz
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AssigneeBarmag Barmer Maschinenfabrik AG
InventorSiegmar Gerhartz
Estimating the term…
A method and apparatus for producing a ribbon free randomly wound yarn package is disclosed, and wherein a plurality of critical winding ratios at which undesirable pattern formations or ribbons would normally occur are determined and stored in a microprocessor control unit. During the winding operation, the spindle speed and traversing frequency are monitored by sensors and are transmitted to the control unit, and the control unit computes the optimum time for rapidly changing the traversing frequency so that the actual winding ratio moves rapidly through each of the approaching critical winding ratios. The original traversing frequency is re-established after having passed beyond each of the critical winding ratios. The present invention further includes continuously oscillating at least the initial value of the traverse speed between a maximum and a minimum value, which renders it unnecessary to change the traverse speed in the case of certain less critical ribbons. Where the ribbon breaking traverse speed is also oscillated, ribbon symptoms which occur in the intermediate ribbon area of the ribbon breaking value of the traverse speed can be avoided or alleviated.
In a method of winding a textile yarn into a core supported package in which the yarn is wound about the core at a substantially constant rate while the yarn is guided onto the core by a traversing yarn guide, and wherein the winding ratio (F), which is defined as the ratio of the rotational speed of the package (NS) to the double stroke rate of the yarn guide (NC), gradually decreases as the package builds, the improvement therein comprising the steps of
An apparatus for winding a textile yarn into a core supported package and including means for rotating the core to wind the yarn thereabout at a substantially constant rate, yarn guide means movable axially of the core for guiding the yarn onto the core, and means for traversing said yarn guide means, and wherein the winding ratio (F), which is defined as the ratio of the rotational speed of the package (NS) to the double stroke rate of the yarn guide (NC), gradually decreases as the package builds, the improvement therein comprising
Dependencies are inferred from the claim text.