Patent ID: 8094036

Claim:
A monitoring device ( 10 ) for a laser machining device ( 12 ) for machining a workpiece ( 18 ), comprising: one or more sensor or sensors ( 20 , 22 ) that monitor one or more process signals ( 24 ) of the laser machining device ( 12 ) in a three-dimensional spatial section ( 26 ) associated with the workpiece ( 18 ), whereby the sensor or sensors ( 20 , 22 ) transmit signal data to a computing unit ( 28 ) so that a warning device or switch off device ( 28 ) for one or more laser beams coupled to the computing unit may be activated if the process signal or signals ( 24 ) in the spatial section ( 26 ) exceed or fall below a prescribed threshold value, wherein the sensor or sensors ( 20 , 22 ) are independent of the laser machining device ( 12 ); a low-energy laser pointer ( 40 ); and a diffractive grid with which the laser beam of the laser pointer ( 40 ) is expanded to form a strip structure or grid structure that is projected into the spatial section ( 26 ).