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US 5,491,318 AGranted
Laser cutting machine
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMasayuki Sugawara, Toshihiro Mori
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AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMasayuki Sugawara, Toshihiro Mori
Estimating the term…
A laser cutting machine which invalidates an alarm generated by a distance sensor during piercing, or invalidates said alarm in a first movement after piercing until a movement is made over a predetermined distance, or invalidates said alarm in a block having no movement, or keeps invalidating said alarm from a piercing start until a movement is made over a predetermined distance after piercing, or invalidates said alarm from a point a predetermined distance before a cutting end point to the cutting end point, or keeps invalidating said alarm from a point a predetermined distance before the cutting end point until a movement is made over a predetermined distance after the arrival at the cutting end point, or invalidates said alarm over a predetermined travel distance in a specified moving command block from the NC program, whereby said laser cutting machine can prevent cutting from being stopped by an unnecessary alarm generated by the alarm signal of the sensor due to scattered or accumulated spatters, the influence of plasma, or inclination of a workpiece or contact with a piece of the workpiece which has blown away at the cutting end point, and cutting can be continued as required.
A laser cutting machine having a laser oscillator, an optical condenser system for directing a laser beam output from said laser oscillator onto a workpiece, a cutting head for holding said optical condenser system therein, a distance measuring means for measuring a distance between said cutting head and said workpiece, an alarm signal output section for judging an excess of an output signal of said distance measuring means over a predetermined range as an alarm state and providing an alarm signal, an alarm display section for receiving the alarm signal from said alarm signal output section and displaying an alarm, and an alarm signal invalidating means for invalidating said alarm signal, said laser cutting machine comprising:
Dependencies are inferred from the claim text.