Abstract: The invention relates to a machining head (10) for a laser machining machine (1) for machining a workpiece (2) by means of a laser beam (5), comprising focusing optics (25) that focus the laser beam; and comprising a drive device (40) for moving and/or adjusting the focusing optics (25), which drive device is designed as a fluidic drive (40); wherein a gaseous stream can be introduced to an area (75) bordering the focusing optics (25) on the incident end of the laser beam (5), and the respective outlet opening (63; 73) is arranged at a predetermined distance from the focusing optics (25) so that the spatial arrangement of the outlet opening relative to the focusing optics cannot be changed if the focusing optics are moved or displaced.

Abstract: The invention relates to an exchangeable module (20) for a modular machining head (10) of a laser machining tool (1) for machining a workpiece (2) by means of a laser beam (5), the carrying structure (30) of which is configured as a hollow part and a driven part is configured as piston unit (26), which is disposed in a cavity of the hollow part and which is guided on a cavity wall (45) of the cavity. The piston unit (26) encompasses a passage duct (29) for the laser beam (5) and a focusing lens (25) is disposed in the passage duct and is attached to the piston unit. The piston unit (26) encompasses opposite piston surfaces (41.1, 42.1), and to which fluid pressure can be applied in each case, so that the focusing lens (25) is capable of being moved forwards and backwards across a readjusting area as a function of the pressure application of the opposite piston surfaces (41.1, 42.2), and is capable of being held fluidically at any position of this readjusting area.