Method for recovering spinning of component yarn on a rotor spinning machine and service device for making the same

摘要

Following an end-break, spinning is re-started at the spinning unit (6) using an auxiliary yarn (41). The freshly spun yarn (4) is then joined in the piecing head (7) to the prepared broken end of the yarn (2) from the wind-up bobbin (5) and the surplus ends cut off (10). The sequence is assisted by yarn suction tubes (8, 13) and jet (11). The piecing head (7) has two guide slots for the yarns (2, 41) and swings during the piecing sequence to provide a clear thread path : Independent claims are also included for the following: (1) A process in which the auxiliary yarn (14) is placed in the piecing head (7) and spinning unit (6) automatically by means of air jets or manually; (2) Equipment to carry out the process including a piecing head (7) that can swing from a position for placing the yarns in the guides to a position for releasing the spliced yarn to the wind-up.