| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a machine which does not remarkably waste gas, is not contaminated with hazardous components and is filled with a gas containing desired components by making a gas volume control device changeable concerning the size based on folding and/or spreading. SOLUTION: A laser beam machine 1 is provided with a laser oscillator 2 and a machining head 4 which is relatively movable to the same in the direction of an arrow 3. A laser beam 5 which is generated with the laser oscillator 2 is guided to a maching head 4 through a beam guiding chamber 6 and is turned to a work piece 7 of thin plate to be processed at the maching head 4. And, a gas chamber 10 which accommodates a gas volume and has a flow connection with a gas volume control device 15 is provided. The gas chamber 10 is closed except the flow connection part with the gas volume control device 15. The gas volume control device 15 is changeable concerning size based on the folding and/or spreading of gas walls 11, 12 which are foldable.</p> |
