Method and device for starting the operation of a friction-spinning machine unit

Abstract

A method of starting the operation of a friction spinning unit having friction surfaces displaceable in opposite directions and forming a spinning wedge, the spinning unit further having a fiber infeeding device, a thread take-up device for drawing a thread longitudinally through the spinning wedge, and at least one suction device acting upon the spinning wedge, at least one of the friction surfaces being formed by a sieve drum, the suction device having a suction nozzle acting upon the spinning wedge by sucking air through the wall of the sieve drum includes: (a) stopping the fiber infeed, and stopping the displacement of the friction surfaces; (b) stopping the flow of suction air from the spinning wedge through the wall of the sieve drum into the suction nozzle; (c) introducing into the spinning wedge through the wall of the sieve drum a suction air flow in a direction opposing the direction in which the thread is being drawn, and guiding the air flow out of the suction nozzle through the wall of the sieve drum and in a direction opposing the direction in which the thread is being drawn, along the spinning wedge, and out of the spinning wedge; (d) after a given effective duration of the suction air flow, introducing a thread end into the spinning wedge in a direction opposing normal thread drawing direction; (e) again applying a suction air flow from the interior of the spinning wedge through the wall of the sieve drum into the suction nozzle; (f) restarting the fiber infeed, and displacing the friction surfaces with increasing speed in opposing directions; (g) resuming the thread drawing, and increasing the thread drawing until normal spinning conditions are reached; and (h) at the latest at this juncture, again stopping the suction air flow directed against the thread drawing direction; and device for performing the method.

Dependencies are inferred from the claim text.