Laser tool - with a distance measuring unit incorporating a pneumatic sensor for determining the pressure produced by a gas jet

摘要

The laser tool incorporates a measuring unit (21) for determining the distance between the tool and a workpiece. Signals from this unit are utilised by a distance control system. The measuring unit (21) includes a pneumatic sensor (23) for determining the pressure produced by a gas jet during approach of the tool to the workpiece. The gas jet emerges through an annular gap (11) surrounding the exit opening (25) for the laser beam. It can also emerge from an annular gap (19) which is functionally connected to the sensor (23). The exits from the gaps (11) and (19) are located at a level (E1), while the beam exit is located at a level (E2) which is closer to the workpiece. USE/ADVANTAGE - In laser cutting and welding installations. Distance between the tool and workpiece is accurately maintainable for any workpiece material. The small size of the tool allows it to be used without special measures on small workpieces.