| 摘要 |
<p>A system, in which the length of propagation path from a laser oscillator (6) to a condensing means (a6) of a processing head (5) in a laser processing machine (1), i.e., an optical path length can be desirably fixed to a preset value. In the multi-axis control type laser processing machine (1) wherein the processing head (5) is drivably controlled in directions of plurality of axes (X, Y, Z axes), respectively, with respect to a main body of the processing machine by a head driving means, and an optical path length extending-shrinking mechanism for extending or shrinking the optical path length from the laser oscillator (6) to the condensing means (a6) independently of the movement of the processing head (5) is inserted into the intermediate portion of the propagation path. In the optical path length extending-shrinking mechanism, there are combined with each other an optical path length control means and an optical path length setting means. The extending-shrinking mechanism is provided with an axis movement value calculating means for calculating a total sum of values of the movement of the respective axes for driving the processing head (5), and a value of 1/2 of the value calculated by the axis movement value calculating means is input to the optical path length control means, to thereby drive the optical path length extending-shinking mechanism and offset a change in the optical path length due to the movement of the processing head. <IMAGE></p> |
