Apparatus for controlling tension applied onto an electric wire in a winding machine

A tension control apparatus in a winding machine for controlling tension applied to a continuous electric wire wound around a bobbin to form a perfect layer coil in such manner that tension of the electric wire is maintained substantially constant independently from variations in a feeding speed of the wire. Rotating positions of the bobbin preceding to those rotating positions by a magnitude corresponding to a time constant of brake means at which the rotation of the bobbin is to be changed among an accelerating rotation mode, a decelerating rotation mode and a constant speed rotation mode are preset in control means together with brake voltages corresponding, respectively, to the rotation modes through programming. The programmed rotating positions are each compared with a detection signal produced from detecting means for detecting actual rotating position of the bobbin. Upon occurrence of coincidence between the two rotating positions, a brake voltage corresponding to the succeeding rotation mode is applied to the brake means, whereby an appropriate braking force is produced upon transition to the succeeding rotation mode thereby to maintain the tension of the electric wire to be substantially constant.