Patent ID: 8383980
Filing Date: 2013-02-26
Classification: B23K,Y10T

Abstract:
1. A laser processing machine having a programmable focus positioning function comprising a torch that is exchangeably mounted on a processing head of the laser processing machine, the torch, comprising: a torch body; a lens holder that holds a collective lens and is mounted axially slidably in the torch body; an assist gas chamber that is provided between a lens holder and a nozzle attached to a tip of the torch; a balance chamber that is provided on the processing head side of the lens holder; a passage that supplies assist gas to the assist gas chamber and the balance chamber; and a gas spring chamber that is provided in an outer periphery portion of the lens holder and urges the lens holder toward the processing head side, a driving device mounted on the processing head side, comprising: a servomotor that is driven by a program of a numerical control device; and an arm that is driven by the servomotor along an axis parallel to a torch axis, wherein the arm is in contact with the lens holder for positioning the lens holder in an axial direction.