Patent ID: 7754998

Claim:
A laser beam machine comprising: a bed, a pallet which is disposed on the bed and holds a workpiece, a column which moves along an X axis in a longitudinal axis of the bed, a saddle which is supported by the column and moves along a Y axis orthogonal to the X axis, a machining head which is supported by the saddle and moves along a Z axis perpendicular to a plane formed by the X axis and Y axis, a laser machining tool equipped replaceably to the machining head, a setup station located at an end of the bed adjacent a control panel, which includes a tool station equipped with a tool change magazine for laser machining tools, to change the laser machining tool equipped replaceably to the machining head, a laser oscillator device, an output mirror, a mirror which leads a laser beam to the laser machining tool, and an optical path system equipped with a machining lens which collects the laser beam, and a focus adjuster comprising a reflection detector which detects light reflected from a work surface, and means for adjusting a focal position of the laser beam to compensate for contamination of the machining lens using the reflected light detected by the reflection detector.