Fecha de publicación: 30/04/1996 Fuente: WIPO "swarm" A banana shaped coil, including a convex (positive radius) surface and opposite concave (negative radius) surface is wound by applying winding wire against the negative radius surface. The winding apparatus is provided with an apparatus for sequentially engaging a trailing edge of the winding wire being applied so as to maintain it in tension against the negative radius surface. The device is disengaged when the winding wire becomes applied against the positive radius surface, since the contour of this surface naturally tensions the winding.