| 摘要 |
A protective mask which has a face shield and an eye shield is used for safety when a worker machines a workpiece by a laser beam. Start switches are provided in the mask, and closed when a worker wears the mask. A laser torch, a conductive clip and a laser oscillator are connected in series. When a workpiece is brought in contact with the end of a taper nozzle of the laser torch and the conducting clip, an electric current is sent from a power source to the laser oscillator, which is oscillated. Thus, accident by laser beam owing to unexpected electric conduction is prevented.
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