Yarn piecing method for yarn spinning machine.

摘要

A yarn piecing method for a yarn spinning machine including a yarn processing portion comprising a drafting unit (1), a yarn forming unit (2), and a yarn winding unit (7) and a yarn piecing unit (8) for piecing an end of a yarn spun from the yarn forming unit (2) with an end of a yarn withdrawn from a yarn package (90), the method including the steps of guiding yarns to be pieced to each other to a yarn sensor (6) before a yarn piecing operation is carried out, detecting whether any yarn defect exists on one or more of the yarns to be pieced, and determining to carry out the yarn piecing operation when no yarn defect is detected and not to carry it out when a yarn defect is detected. <IMAGE>