Patent ID: 9731381
Date: 2017-08-15
CPC Classifications: B23K

Claim:
1. A laser cutting head powered by a laser emission device for a cutting machine tool, comprising (a) a casing including a cavity having an opening; (b) a cover formed of a thermally conductive material removably connected with said casing to close said opening; (c) a collimation device connected directly with said casing for collimating a laser beam emitted from the laser emission device; (d) a focusing device arranged within said cavity for focusing a collimated laser beam from said collimation device, said focusing device including a support device and at least one lens retained by said support device, said support device comprising a support element formed of a thermally conductive material and being adapted to move within said cavity along an adjustment direction in order to vary a focal point of said collimated laser beam; (e) a cutting nozzle that is secured to said casing and through which the focused laser beam passes, said cutting nozzle concentrating a gas jet for removing molten material generated by the fusion of a workpiece that is cut by the laser beam; (f) an external cooling unit connected with said cover and comprising at least one Peltier cell; and (g) at least one heat conducting device connecting said support device with said cooling unit via said cover, wherein said cover is disposed between said heat conducting device and said cooling unit, said heat conducting device being adapted to extract heat generated by said collimated laser beam crossing the focusing lens by thermal conduction in order to cool said focussing lens and avoid thermal focus shifting thereof, said heat conducting device being formed of a non-rigid material to afford movement of said support device along the adjustment direction during operation of the laser cutting head.