Measuring and testing – Sheet – woven fabric or fiber – Filament
Patent
1989-05-19
1991-06-25
Cuchlinski, Jr., William A.
Measuring and testing
Sheet, woven fabric or fiber
Filament
364568, G01N 3336, G01N 500
Patent
active
050256602
DESCRIPTION:
BRIEF SUMMARY
The invention relates to apparatus and methods for the automatic determination of the count of a textile test sample in the form of yarns, rovings or slivers.
In textile practice, such determinations of count are important. For example fluctuations in fineness (also referred to as fluctuations in count), which are fluctuations in the weight per unit length of a yarn may lead to weft bars in woven fabrics and to irregularities in knitted goods. In order to avoid these losses in quality as far as possible, determinations of count (or count checks) are carried out continuously in the textile laboratories of spinning mills. Such count checks make it possible to detect and eliminate machine setting and operating errors as quickly as possible.
In the past, these count checks have been done semi-automatically in the laboratory. Lengths of the test sample are taken off from a bobbin more or less manually and laid, likewise manually, on the scales. The evaluation then takes place automatically. Bearing in mind that other test apparatuses used in textile laboratories (such as, for example, the tester sold by Zellweger Uster AG under the trademark USTER TESTER, process a few hundred meters of yarn per minute, it becomes clear that determinations of count can be made only by sampling. Because of the comparatively modest yarn processing capacity of the conventional count check apparatus, it has not been feasible to interface, such test apparatus with other test apparatuses, such as, for example, evenness testers. However, such interfacing would be an important step in the direction of an automatic textile laboratory.
Some proposals have recently been made for automating the determination of count. Two of these are described in DE-A-3,402,181 and EP-A-129,076. In each case, there is a proposal for the combination with an evenness tester of an apparatus for the determination of count having scales downstream of the evenness tester. Essentially, the evenness tester contains a measuring element and a take-off means formed by a pair of rollers, and the scales are arranged immediately below the take-off means.
In this way, the length of the test sample required for a determination of count, usually at least 100 meters, is transported into the scale pan by the take-off rollers and gravity. However, has been found that the measurement results are intolerably distorted even by the tiniest length of test sample hanging over the edge of the scale pan or becoming entangled somewhere. Since such distortion occur relatively often, the measurement results are not reproducable and not reliable, so that these known apparatuses have not yet become fully acceptable.
There are, moreover, two further disadvantageous properties: on the one hand, the continuous transport of the test sample into the scale pan has a negative effect on the tarings and zero constancy of the scales, and, on the other hand, the removal of the test sample lying in the scale pan after measurement is equally disadvantageous because it requires undesirably strong shocks of compressed air. Again, these apparatuses are limited as regards the rate of transport.
The present invention provides features useful in methods and apparatus for making automatic count checks and for yielding more exact and reliable measurement results. Another aspect of the invention permits the test sample to be removed from the scale pan smoothly and without difficulty.
According to the invention, means are arranged in the path of the test sample upstream of the scales for forming the test sample taken off at any one time into a ball-like bundle.
Whereas earlier proposals provided for the test sample to be transported into the scale pan without any additional manipulation, the present invention envisions forming a test sample into a ball-like bundle before deposition onto the scale pan. This guarantees that parts of the test sample do not hang over the edge of the scale pan or become entangled somewhere and, in addition, after measurement it is possible to remove the ball simply, whether by blow
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Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Zellweger Uster AG
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