Abstract: A false twister which nips a yarn-between crossed belts and impart twist and feed to the yarn includes a sensor for detecting an untwisting tension of the yarn portion located downstream of the belts and the untwisting tension detected by the sensor is controlled to a target value of an untwisting tension by adjusting a contact pressure between the belts or a running speed of the belts.

Abstract: A method of threading in a false twisting machine, capable of surely attracting the free end of a yarn by suction and of preventing the yarn from slacking during a threading operation. A traveling doffer travels along a false twisting machine which oils yarn with oiling rollers and takes up the oiled yarns in yarn packages. During the doffing operation, the free end of the yarn extending on the delivery side of the oiling roller is sucked, while the yarn is separated from the oiling roller.

Abstract: A system for conveying packages of synthetic fiber yarn in which an overhead traveling carriage including a carrier having downwardly projecting bobbin chucks is connected between a station where it receives packages of unfinished yarn from pallets, and a station where it transfers those packages to a package exchange robot in a twisting machine, and another overhead traveling carriage including a carrier having horizontally projecting peg shafts is connected between a station where it receives packages of processed yarns from a rotary peg in the twisting machine, and a station where it delivers those packages to a rotary stocker.

Abstract: A package conveyance apparatus wherein the packages are doffed out of the body of the draw false twisting machine by an automatic doffer which is moved between the body and primary heaters, the packages are transferred onto pegs coupled to an endless drive device which is revolved around the primary heaters, the device is then revolved to convey the packages, and pushers push out the packages onto an out-of-the-machine conveying device having trays or pegs.

Abstract: A doffing truck for a yarn false twisting machine which travels between a plurality of juxtaposed yarn winding units and a peg stand located in an opposing relationship to the yarn winding units and exchange empty bobbins mounted on pegs of the peg stand for fully wound packages from the yarn winding units, wherein it includes a slide frame mounted for reciprocal movement between the yarn winding units and the peg stand, a support arm for receiving a fully wound package from the yarn winding unit and mounting it onto the peg and a bobbin chucking device mounted on the slide frame for holding a bobbin and mounting the bobbin onto the yarn winding unit.

Abstract: A yarn is traversed by a drum provided with a guide groove having a plurality of the above-mentioned traversing grooves so that the returning positions at the opposite ends of the package are varied alternately in the direction of the axis of the drum, and the outer returning positions and the inner returning positions are made to creep differently. The creeping is achieved by controlling the traverse guide which travels along the guide groove with a cam.