| 摘要 |
For detecting an improperly inserted pick of weft yarn in a weaving loom, a tension signal representative of a total of tensions detected of a predetermined number of warp yarns forming an end portion of the weaving shed during beating of the weft yarn in each cycle of operation of the loom is compared with a variable reference signal which is representative of, for example, a predetermined fraction of the arithmetic means of the sums of the warp yarn tensions detected during the cycles of operation prior to the cycle in which the tension signal is produced and compared with the reference signal.
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