A doubled yarn false twisting machine

摘要

A simple yarn breakage detecting device that, even if a single yarn of a plurality of yarns which have been doubled breaks downstream of the first feed rollers, cuts all of the yarns which have been doubled upon detecting that yarn breakage. An untwisting tension detection device 1 for detecting the untwisting tension T of a false twist and positioned downstream of the first feed rollers F1 detects an untwisting tension T and judges a yarn breakage using the fact that the untwisting tension T changes greatly when a yarn breakage occurs, operates a cutter 2 and cuts both yarns comprising a conjugated yarn.