A device for feeding reels has a manipulator having a gripping member for picking up one reel at a time off a pallet and transferring the reel to an unwinding pin on a machine ; the gripping member is enabled to pick up a reel off the pallet when at least one reference point of the gripping member lies inside a central hole of the reel. The transformer has at least one primary coil and at least one secondary part, which are connected with bus bars. A skirt is coupled to each wall at the joining seam and extends external to the floor perimeter. A third circuit is provided to combine the signals output by the processing circuit.