Process and device for detecting impurities in a textile test material
AssigneeZellweger Uster AG
InventorsRolf Joss, Hans Wampfler
Life of this patent
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Abstract
The test sample (G) is illuminated at at least two points (S 1, S2) and the reflection from the test sample (G) and also the diameter of the sample or the change therein are measured by receivers (E1, E2). The measurement signals thus obtained are linked together and the signal resulting from this process is examined for differences from a predetermined value. If a difference is detected, there is an impurity in the test sample (G). For use in combination with an electronic yarn clearer for the detection of foreign fibers in yarns.
Claims22
A process for detecting impurities in a textile test material, comprising the steps of:
- illuminating the test material with light;
- measuring light reflected by the test material to produce a reflection signal;
- producing a diameter signal indicative of changes in the diameter of the test material;
- combining the reflection signal and the diameter signal to produce a measurement value;
- and
- detecting changes in the measurement value to indicate the presence of an impurity in the test material.
A device for the detection of impurities in a textile test material, comprising:
- light source means for producing multiple illuminations of the test material;
- means for receiving and measuring light reflected and/or attenuated by the test material for each of said multiple illuminations;
- means for detecting the diameter of the test material from the measurements obtained from at least one of said illuminations;
- and means for comparing the measured light reflected by the test material to the diameter of the test material, to thereby detect impurities in the test material.
Dependencies are inferred from the claim text.