Method of piecing-zone up a yarn formed on a spinning position, or for starting the spinning process, and a spinning position equipped for implementing the method

摘要

In a spinning position of a spinning machine a longitudinal fibre array first is refined in a drafting process, and the refined fibre array (10) then is subject to a twist imparting process, and is taken off the twist-imparting zone as a yarn (11). In case of an interruption of the spinning process the intake into the refinement zone is stopped before the delivery from the refining zone is stopped in such a manner that the longitudinal fibre array is severed between the intake and the delivery zones forming a free front end zone. The free end (11) of the yarn, generated by the interruption of the spinning process is treated in such a manner that a yarn end zone (1) is formed tapering off, and is positioned upstream from the twist imparting zone. Ad the spinning process is resumed the movements of the yarn end zone (1) and of the fibre array front end zone (2) for imparting twist are coordinated in time sequence in such a manner that these two zones overlap as they are subject to the twist imparting process. Furthermore owing to the controlled reduction in draft, adapted to the taper of the yarn end zone, a gradually increasing fibre mass is generated in the fibre array front end zone (2), which can be very exactly adapted to the taper of the yarn end zone (1). The piecing-zones (3) in the finished yarn (3) generated in the piecing-zone-up process or in the spinning start-up process present sufficient tensile strength in order to ensure problem-free further processing in spinning, their fibre mass not exceeding the one of the normal yarn by more than 20%.