Device and process for handling and controlling the yarn of a crosswinding head of a crosswinding machine during the starting operations of a new lot

A process for handling and controlling the yarn (2) in a crosswinding head of a crosswinding machine during the starting operations of a new lot, said crosswinding machine being equipped with a series of crosswinding heads and at least one service trolley (16), each of said crosswinding heads comprising a pirn (1), from which a yarn (2) unwinds, which is wound to form a bobbin around a winding tube, a suction mouth (7) and a suction mouth (8), for the suction of the yarn (2) ends possibly formed, by breakage or cutting, on the side of the pirn (1) and on the side of the bobbin, respectively, and for the delivery of these ends to a joining device (9), situated along the run of the yarn (2) from the pirn (1) to the bobbin, for re-establishing the yarn continuity, said service trolley (16) sliding along the whole crosswinding machine so as to position itself in correspondence with each crosswinding head and comprising a handling device (15) of the yarn (2), characterized in that it comprises the following phases:

• collection, by suction, of the yarn (2) end of a new pirn (1) on the part of the suction mouth (7) on the side of the pirn (1),
• consignment of the yarn (2) from the suction mouth (7) on the side of the pirn (1) to the joining device (9),
• collection, by suction, of the yarn (2) end coming from the pirn (1) and withheld by the joiner (9) on the part of the suction mouth (8) on the side of the bobbin,
• collection of the yarn (2) withheld by the suction mouth (8) on the side of the bobbin by a handling device (15) of the service trolley (16),
• positioning of a new winding tube of the yarn (2) coming from the pirn (1) and starting the formation of a new bobbin.