Laser device and its use and method for processing a glass sheet

A mobile laser device for processing glass sheets installed in an object, preferably a vehicle, more preferably a train, or a structure work, preferably a building, and comprising at least one glass pane, by means of laser radiation at different places of use, having a laser gantry with

• a) a gantry base frame,
• b) a laser unit movable back and forth on the gantry base frame in an x, y and z direction of the laser gantry relative to the gantry base frame, having a laser head with a, preferably interchangeable, laser radiation source for providing a laser beam,
• c) preferably a laser protection bonnet covering the laser unit to protect the environment from laser radiation,
• and
• d) Fastening means for fixed but detachable attachment of the laser gantry to the object,
• wherein the laser unit comprises a distance measuring device for measuring the glass sheet to be processed in the z-direction, and the laser head comprises an optical z-focus adjustment device for the, preferably automated, displacement of a laser focus of the laser beam along an optical z-axis of the laser head, in particular during the processing of the glass sheet.