Patent ID: 6606847
Filing Date: 2003-08-19
Classification: D01H

Abstract:
A method of spinning-in yarn at a spinning unit of a rotor spinning machine, said method comprising:steps of yarn preparation, steps of spinning rotor preparation, and final spinning-in steps; said steps of yarn preparation comprising detection of a yarn end on a bobbin or preparation of an auxiliary yarn if spinning-in on an empty tube, unwinding and metering a yarn length required for the spinning-in, placing the yarn into a path in which it is unclamped by rollers of a yarn draw-off mechanism, and introducing the yarn end into a yarn delivery tube extending from a spinning rotor; said steps of spinning rotor preparation comprising opening the spinning unit from its operative spinning position to a cleaning position, cleaning the spinning rotor in a stopped position thereof, and closing the spinning unit to its operative spinning position; said final spinning-in steps comprising starting sliver supply to a fiber singling-out device, leading singled-out fibers from the singling-out device away from the spinning rotor for a predetermined time interval, bringing the yarn end into contact with a collecting groove in the spinning rotor, and starting yarn draw off and winding; detecting closing of the spinning unit and generating a control signal corresponding thereto; and wherein at least one of said final spinning-in steps is synchronized with said closing of the spinning unit as a function of the control signal so as to commence at a set predetermined time interval measured from said closing step, said remaining final spinning-in steps being carried out in a timed relationship with the synchronized final spinning step.