Patent ID: 7043894

Claim:
An air spinning frame having a plurality of spinning places for the production of spun thread from a supplied longitudinal fiber formation, each of said spinning places comprising: a drafting unit having at least two pairs of drafting rollers, said drafting units drafting said longitudinal fiber formation; a pair of drawing-off rollers positioned downstream from said drafting unit in a direction of travel of a formed thread created from fibers discharged from said drafting unit, said pair of drawing-off rollers transporting said thread after the formation of said thread; a friction roller positioned downstream from said pair of drawing-off rollers in the direction of travel of said thread, said friction roller driving a yarn package to wind said thread onto said yarn package; a plurality of electrically driven reluctance motors operably connected to said pairs of drafting rollers, said pair of drawing-off rollers, and said friction roller, said reluctance motors driving said pairs of drafting rollers, said pair of drawing-off rollers and said friction roller; and a plurality of frequency converters with at least one of said frequency converters operably connectable to each of said reluctance motors by a respective switch.