a textile machine for the production of twisted yarn made of various fibers; the machine was developed in the USSR in the period 1956–61. The spinning-and-twisting frame performs the combined spinning and twisting process developed by the Soviet inventor P. K. Korikovskii. The process carries out simultaneously four operations—spinning, ply doubling, twisting, and winding—that were formerly done on different machines.
During the operation of the spinning-and-twisting frame, the roving is fed from the bobbins onto the drafting device, where it is drawn into a broken end of the required fineness. The broken end is fed from the drafting device onto the axial duct of the spindle, by which it is twisted into yarn. The yarn from the cop on the spindle is also fed onto the duct. The yarn to be spun and wound from the cop is doubled in the spindle duct and, after leaving the duct, is twisted. The finished twisted yarn is then wound onto the bobbin.
Spinning-and-twisting frames permit higher twisting speeds, increased labor efficiency, and reduced electrical power consumption and equipment maintenance expenses.