Method of, and device for, performing a start spinning operation for

Abstract

For performing a start spinning operation in a friction spinning apparatus, upon starting or recommencing spinning of a yarn after yarn breakage, there are accomplished the following steps: fibers opened in a fiber sliver opening device are delivered by a fiber infeed duct to a rotating friction spinning drum and twisted into a twisted fiber structure or coil. When the coil has reached a substantially predeterminate diameter it is entrained by an air jet delivered by a blowing duct into a yarn entraining nozzle which deflects the coil and the yarn following the coil, before they reach the rotating yarn drawn-off rolls, axially of the yarn draw-off rolls, into a yarn guide duct. A suction device is located at the outlet of the yarn guide duct such that a negative pressure is produced therein for taking up the air from an injector part of the yarn entraining nozzle and the coil and the yarn following the coil and supplying such to the suction device. After the coil has passed by a non-continuous draw-off roll of the yarn draw-off rolls, the entraining air in the injector part and in the blowing duct is interrupted such that the yarn extracted by the suction nozzle is stretched and issues from the yarn guide duct through a slot therein and is guided between the yarn draw-off rolls. This yarn take-up by the yarn draw-off rolls accelerates the yarn to the operative yarn draw-off speed.