Patent ID: 8567222

Claim:
A method of manufacturing an insulated electric wire comprising: supplying a conductor to a conductor rolling process in a conductor feeding process; rolling the conductor in the conductor rolling process in a predetermined shape; rolling the conductor in a conductor wire drawing process with a pair of first rolling rolls rotating freely without a drive mechanism and passing the conductor through a die to wire-draw the conductor; annealing the conductor wire-drawn in the conductor wire drawing process with a conductor annealing unit and supplying the conductor to a coat baking process: forming an insulating coat on the conductor in the conductor baking process at a constant feeding speed to obtain the insulated electric wire; and winding an electric wire in an electric wire winding process covered with the insulating coat in the coat baking process with an electric wire winding unit, wherein, in the conductor rolling process, a pair of second rolling rolls is rotated with the drive mechanism to roll the conductor in the predetermined shape, and a distance between the second rolling rolls is variably controlled according to a change in a width of the conductor after rolling and according to the constant feeding speed of the conductor in the conductor baking process, in the conductor rolling process, said second rolling rolls are rotated with the drive mechanism at a rotating speed variably controlled according to an elongation of the conductor in a longitudinal direction thereof after rolling and according to the constant feeding speed of the conductor in the conductor baking process, and an entire process from the conductor feeding process to the electric wire winding process is conducted in a tandem arrangement.