Abstract: An apparatus having a drive pulley around which the wire is rolled, driven by a motor coupled to a speed control element. The pulley is provided with a tachometer which generates a signal proportional to the speed of movement of the wire. An extensometer, coupled to the wire, generates a signal, representative of a predetermined, ideal tension in the wire, which is compared with a set value. The resulting signal is superimposed on the tachometer signal to generate a signal to control the control element. The apparatus may also be provided with a spring biased oscillating arm located after the extensometer that has a pulley on one end, over which the wire passes. Also, a coding wheel may be provided after the oscillating arm assembly which generates a signal proportional to the speed of the wire. The coding wheel signal is converted to a signal representative of a variation in tension of the wire.

Abstract: A coil winding installation includes a conventional winding machine with an XYZ table and supply tables moveable along a rail with respect to the winding machine. Each table carries a different type of wire delivered by a feeder and a supply coil with a wire guide bar and a fastening bar mounted on the supply table. The wire guide bars and fastening bars are moveable vertically on the supply table and for winding operations the wire guide bar is coupled and fixed to the XYZ table of the winding machine. Once the winding is completed, the wire guide bar is placed on the supply table which can be released to make room for another supply table equipped with a new type of wire. The wire changeover to go from one production series to another is thus automated and avoids the usual losses of time.