Patent ID: 6938849

Claim:
Process for the automatic elimination of start and finish end portions of yarn, containing frequent and widespread defects, from spools of feed yarn and packages of wound yarn, of winding units of an automatic winder comprising, using said automatic winder's members dedicated to reattachment operations of said end portions of yarn from said spools and packages, wherein at each change of a feed spool ( 1 ), said yarn has portions thereof removed, respectively said start and finish end portions of yarn of said feed spool and said package are sucked in using one or more suction nozzles ( 9 , 10 ) for capturing and moving said end portions, said suction nozzles having preset times to capture a portion of yarn of a predetermined length, and carrying out said reattachment operation of said end portions of yarn, and prior to said reattachment operation having cut said start and finish end portions of yarn and sucking them in with said suction nozzles ( 9 , 10 ), said automatic winder further comprising optical sensors ( 43 , 53 ) aligned or directed tangentially to said feed spool ( 1 ) of yarn, and in correspondence with start layers ( 40 , 40 ′) and end layers ( 41 , 41 ′) of said spools of feed yarn to be unwound.