LASER BEAM MACHINE

摘要

PROBLEM TO BE SOLVED: To avoid the complicating and weight increasing near a torch without manual labor in focus position adjustment of a laser beam. SOLUTION: This laser beam machine has an inner sleeve member 21. This inner sleeve member 21 is provided with an outer sleeve member 22 freely movably in a Z-axis direction. An optical path KL is formed in the inner sleeve member 21 and the outer sleeve member 22 in the form of arriving at a nozzle 45. The inside part of the inner sleeve member 21 is provided with a condenser lens 50 in the form of arranging the same in mid-way of the optical path KL. A brake mechanism 16 is disposed between the inner sleeve member 21 and the outer sleeve member 22 in the form that the relative movement thereof may be freely restrained or released from the restrain. An engaging groove 43 is formed at the outer sleeve member 22 and is provided with an engaging groove 56 freely engageably and disengageably with and from the outer sleeve member 22 via this engaging groove 43 in the state that the outer sleeve member 22 is arranged in the engaging position QP on the Z axis.