The head (11) of a winding form (1), including two metal paths (12a, 12b), is held between two jaws (30, 31) of the chuck (3). A winding mechanism (40) leads one end of a winding wire (23) above one of the metal paths, being guided by a first guide pin (39a) and a front face (30b) of one of the jaws....http://www.google.com/patents/US5393001?utm_source=gb-gplus-sharePatent US5393001 - Core chuck for coil winding
