Laser machining machine

Machine for machining any three-dimensional workpiece by means of a focused laser light beam that causes a parcel of material to be locally evaporated at a surface of the workpiece to be treated so as to engrave the surface of the workpiece, the machine comprising:

• three orthogonal linear axes (X, Y, Z) and two mutually perpendicular rotary axes (B, C), and means for rotating a laser machining head (8) about the axis (B) which is horizontal and to rotate a workpiece to be treated about the axis (C) which is vertical;
• a laser light beam (26) being reflected at an exit of the laser machining head (8) by a galvo-scanner (25) consisting of two steering mirrors which are pivotable about two perpendicular axes, wherein the laser light beam (26) being produced by a laser source (90);
• the laser source transmits energy to the laser machining head via an optical fibre (24) that is unreeled along a cableway system;
• the optical fibre terminates at an optical output head (27) which defines an optical axis of the laser light beam;
• the laser machining head (8) comprises a frame (49) and a casing, wherein the laser machining head (8) is selectively repositioned and re-steered to direct the laser light beam on different areas of the workpiece to be treated;
• the optical output head (27) is rigidly attached to the frame (49) or to the casing of the laser machining head so that the optical output head remains integrally fastened to the frame or casing during rotation of the laser head about the horizontal axis (B);
• a suction nozzle (37) which is integrated into and rotates with the laser machining head during the rotation of the laser machining head about the horizontal axis (B) collects polluted gases generated in a machining area by evaporation of material;
• a blowing nozzle (35) which is integrated into and rotates with the laser machining head (8) during the rotation of the laser machining head about the horizontal axis (B) injects a stream of clean dry gas into the machining area;
• and
• wherein the laser machining head (8) is provided with a tensile and torsional strain relief device (41, 42, 59) for relieving the laser machining head (8) of mechanical stresses induced by connected cables.