Patent ID: 6901734

Claim:
A yarn false twist texturing apparatus comprising a yarn feed system for advancing a yarn along a path of travel, a yarn heater, a yarn cooling device, and a yarn twisting unit serially arranged along the yarn path of travel, said yarn cooling device comprising a cooling tube which defines a feed end adjacent the yarn heater, and an opposite delivery end, an inlet yarn guide positioned adjacent the feed end of the cooling tube, and an outlet yarn guide positioned adjacent the delivery end of the cooling tube, for guiding the advancing yarn spirally along a cooling zone on the outside periphery of the cooling tube, and a yarn lifter positioned between the inlet and outlet yarn guides for guiding the advancing yarn within the cooling zone over a partial length thereof wherein the advancing yarn is spaced from the outside periphery of the cooling tube, and wherein the yarn lifter is selectively moveable either in an axial direction so as to change the point along the length of the cooling tube at which the yarn is spaced from the outside periphery of the cooling tube, or in a direction so as to change the radial spacing of the yarn from the outside periphery of the cooling tube.