Patent ID: 7458244

Claim:
A feeding unit for feeding a fastening element to a treatment unit of a machine tool, the feeding unit comprising: a guide tube; a rotary element mounted within said guide tube and being rotatable about an axial direction, said rotary element being axially displaceable and telescopically guided in said guide tube, said rotary element having a first end and a second end opposite said first end; a permanent magnet fixed on said rotary element at said second end of said rotary element; said guide tube having magnet coils disposed thereon, said magnet coils being disposed such that during an axial displacement of said rotary element, said permanent magnet being axially displaceable to an axial position of said magnetic coils for providing a magnetic force producing a torque on said rotary element to rotate said rotary element; and a gripping element for automatically taking-up of the fastening element from a supply unit and automatically feeding the treatment unit, said gripping element disposed on said rotary element at said first end.