a spindleless method of spinning in which the individual fibers are transported pneumatically into the rotary chamber of a spinning machine, where they are twisted into yarn. The yarn is removed from the chamber by special rollers, after which it is wound on a bobbin. Separation of the winding and twisting processes makes possible removal of the bobbin of yarn from the twisting unit and permits a significant increase in the speed of the twisting unit, the speed of the spinning process itself, and the weight of the bobbin of yarn in comparison with the traditional method of spinning. The increase in weight eliminates the necessity of rewinding the yarn and reduces the time required to remove the finished product.
The first industrial model of a machine designed to spin yarn of medium thickness from cotton fiber by the pneumatomechani-cal method was built in Czechoslovakia in 1967 by Czechoslovak and Soviet specialists. In machines of this type, a serrated roller is used as the main working unit of the thinning and separating mechanism. The yarn made on such machines differs somewhat from traditional yarn in outward appearance and physical and mechanical properties but is suitable for making most textile and knitted articles.