34—IMPROVEMENTS IN INTEGRATORS FOR ELECTRONIC REGULARITY TESTERS

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Abstract
The performance of electronic yarn regularity testers is compared and and it is shown that, whilst the autographic records given by several instruments on the same lengths of yarn agree closely, the integrator readings of the coefficient of variation may vary considerably, and different testers do not always place a series of yarns in the same order of regularity. These variations in the performance of integrators are explained by the fact that the conventional type of integrator measures a biassed average of the deviations from the mean and the bias may vary from one instrument to another. The effect of this bias on the measurement of irregularity is discussed and patented circuits are described, first, for eliminating the bias, so that the integrator measures the true value of the mean or the standard deviation, and, secondly, for introducing an extreme bias, so that the integrator measures a mean range of the variations or the differences between the mean and the mean values of either the thickest or the thinnest places in the yarn.

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