Laser beam machine

TL;DR: In this article, a machining head 20 of a laser beam machine has a working part 40 and a range finding part 80, where the laser light beam sent from a laser oscillator 10 is separated to a laserbeam light R1 for machining and a laser beacon light R2 for range finding, and a condensing lens 48, focusing at the upper surface of a work 300 on a table 30 and then machining a work.

Abstract: PURPOSE:To automatically adjust a focus position of laser beam by constantly measuring the distance between a machining head and work in a laser beam machine. CONSTITUTION:A machining head 20 of a laser beam machine 1 has a working part 40 and range finding part 80. The laser light beam sent from a laser oscillator 10 is separated to a laser beam light R1 for machining and a laser beam light R2 for range finding, a machining laser beam light is condensed by a condensing lens 48, focusing at the upper surface of a work 300 on a table 30 and then machining a work. The range finding laser beam light R2 is condensed by a lens 86 and reflected on a work upper surface 310. The reflected light beam is received by a photo cell 90 and transduced to an electric signal. A measuring instrument calculates the distance to the work upper surface by a signal of the photo cell 90. A controller adjusts a position of the condensing lens 54 through a stepped motor 50 in response to the variation of a position of the work upper surface.