| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an enhanced freedom of selection of condenser lenses having different focal lengths, to miniaturize a laser beam cutting torch as much as possible, and to provide an easy operation of the laser beam cutting torch which cuts a work to be cut by irradiating the work with a laser beam which is introduced from a laser oscillator and emitted from a nozzle. SOLUTION: A torch A is so composed as to be turned around a first optical axis 1a perpendicular to the work to be cut B, located in a horizontal direction which crosses perpendicularly to the first optical axis 1a, turnable around a second optical axis 2a and a fourth optical axis which are in parallel with each other. The torch A is provided with a first reflection mirror 7 which accepts the laser beam and a second reflection mirror 8 arranged facing to plural reflection mirrors 9 and 10 and a nozzle 6. The angle of the nozzle 6 is set when the torch A is turned around each of the optical axes 2a and 4a, and a fifth optical path 5a irradiated from the nozzle 6 is so composed as to be set at the intersection of the vertical first optical axis 1a and the work B to be cut or at a position dislocated from the intersection by a predetermined distance, and a condenser lens 21 is arranged between the first reflection mirror 7 and the second reflection mirror 8.</p> |
