PROCESS AND DEVICE FOR LAYING AND FIXING A THIN METAL THREAD ON A THERMOPLASTIC FILM OF A LAMINATED WINDOW GLASS, THERMOPLASTIC FILM AND LAYERED WINDOW GLASS INCORPORATING THE THERMOPLASTIC FILM

摘要

Some thin resistance wires (8) are laid in a curved manner on a thermoplastic film (1 and 2) which is provided for manufacturing an electrically heatable motor vehicle window. The thermoplastic film (1 and 2) is maintained by negative pressure on the surface of a cylindrical drum (11) having a perforated cylindrical wall. The drum (11) is rotated and the thread (8) is laid and fixed on the film by means of a thread laying device (26). The thread laying device is mounted on a carriage (20) which can be displaced parallelly to the longitudinal axis of the drum (11). The carriage (20) is driven by means of a driving screw (21) entrained in rotation by a drive motor (22). The drive motor (22) is controlled through a processor (35) by means of a regulating amplifier (24) piloted by a processor (35) on the basis of a time-travel program determined depending on the desired curved shape of the threads (8).