Method for detecting break point of thread and apparatus therefor

Abstract

Yarn breakage position detecting method and device. The device includes a tension detector arranged at a reference position, to monitor tension of a running yarn, so that from a tension signal output by the tension detector, occurrence of yarn breakage is first detected and passage of the end of a broken yarn through the reference position is then detected. The yarn breakage position is calculated based on the time period from occurrence of yarn breakage to passage of the broken yarn end through the reference position. The time when the yarn is broken is stored as a time at which the tension signal becomes a peak value and/or a time at which the tension signal begins to decrease below a steady state tension value. The time when the yarn passes through the reference position is stored as a time at which the tension signal becomes lower than a lower limit value and/or a time at which natural oscillation begins.

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