Method and device to initiate the rewind operation after a yarn break during centrifugal spinning

To start the rewinding process at a single-stage centrifugal spinner, after yarn breakage, a yarn detaching unit (14) is moved by a drive (23) at a cone winding (32) of the spinning cake (15). A yarn guide at the unit has a yarn guide contour (17) to lift the lower winding layers of the spinning cake (15) to the level of a rewinding sleeve (9), so that wrapping of the yarn detaching unit (14) is effectively prevented during rewinding. The yarn detaching unit (14) is moved into the spinning centrifuge (3) parallel to its inner wall (26), to bring a cutter (16) into contact with the wound cone (32) at the bottom of the spinning cake (15), and the yarn guide contour (17) is positioned at the lower wound layers. The axial force component (19) on the yarn detaching unit (14), on starting the rewinding process, is used by a force monitor (18) to generate a signal (s). During rewinding, the torque (22) at the rewinding sleeve (9) is used by a torque monitor (20) to generate a signal (i). An Independent claim is also included for the apparatus used for starting rewinding process, which includes a yarn detaching unit (14), with a cutter (16) to be presented to the cone winding (32) of the spinning cake (15) covered axially by a yarn guide contour (17). Preferred Features: A force monitor (18) is at the yarn detaching unit (14), with a signal line link (33) to the control (30). The torque monitor (20) at the rewinding sleeve holder (21) has a signal line (34) link to the control (30). The yarn (25) emerging from the yarn guide tube (7) is laid at the inner wall (26) of the spinning centrifuge (3), and the yarn detaching unit (14) can have an adjustable detacher, which is moved from a rest position into a working setting, in a swing movement which is operated elastically, pneumatically or electrically, to be placed against the spinning cake (15) with an adjustable and defined force, to set the pressure of its pointed or rectangular cutter against the spinning cake (15). The detacher is contained within a shrouding, with a slit opening for the detacher to be extended and retracted. Limit stops define its range of movement. The yarn detaching unit (14) can have a controlled by a compressed air jet, which delivers an air jet stream to match a beating plate at the detacher. The yarn detaching unit (14) can be fitted with an energizing system where a current flow to a magnet coil gives an elastic movement to the swing detacher, which is composed at least partially of a fe