Method for determining the length of filamentary materials, such as yarn, wound upon a cross-wound package by means of a friction drive and a grooved drum
First Claim
1. A method for determining the length of a yarn wound upon a cross-wound package at a winding apparatus with the aid of a friction drive by means of a grooved drum, comprising the steps of:
- continuously measuring during the winding operation in successive time intervals the slip governed by the ratio of the circumferential velocities of the grooved drum and the cross-wound package;
determining therefrom a measured magnitude of the slip; and
undertaking with aid of the measured magnitude of the slip a correction of the yarn length determined during the momentary successive intervals without taking into account the slip.
1 Assignment
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Accused Products
Abstract
During the measurement of the length of filamentary materials, for instance a yarn, which is wound into a cross-wound package which is driven by a grooved drum, appreciable errors arise because there is not taken into account slippage. Therefore, with the present method during the winding operation the slip, which is governed by the relationship of the circumferential velocities of the grooved drum and the cross-wound package, is continuously measured in successive time intervals, and there is undertaken a correction of the yarn length determined without taking into account the slip. Thus, sensors continuously measure the rotational speeds of the cross-wound package and the grooved drum, and an angle measuring device determines the diameter of the cross-wound package, these measuring results then being inputted to an evaluation circuit. In the evaluation circuit there is computed the slip and such is incorporated into the length measurement.
23 Citations
11 Claims
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1. A method for determining the length of a yarn wound upon a cross-wound package at a winding apparatus with the aid of a friction drive by means of a grooved drum, comprising the steps of:
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continuously measuring during the winding operation in successive time intervals the slip governed by the ratio of the circumferential velocities of the grooved drum and the cross-wound package; determining therefrom a measured magnitude of the slip; and undertaking with aid of the measured magnitude of the slip a correction of the yarn length determined during the momentary successive intervals without taking into account the slip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification