| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a laser processing machine having an exchangeable torch wherein a light focus position is automatically adjusted by a program. <P>SOLUTION: A laser processing unit 100 includes a torch 130 that is exchangeably mounted on a processing head 110. The torch 130 has an assist gas chamber 140 and a balance chamber 142, and the assist gas AG is supplied to the chambers. Constantly, equal pressures act on both chambers, and an upward first force F1 and a downward second force F2 that act on a lens holder 150 are canceled each other because pressure reception areas are equal. Gas AS is supplied to a gas spring chamber 144 to provide a constant upward force to the lens holder 150. A driving device 200 has an arm 260 driven by a servomotor 220. The arm 260 is in contact with a pin 180 and the lens holder 150 is moved to a predetermined position for automatically adjusting a focus position FC of a collective lens 160. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
