| 摘要 |
PCT No. PCT/JP94/00012 Sec. 371 Date Sep. 12, 1994 Sec. 102(e) Date Sep. 12, 1994 PCT Filed Jan. 7, 1994 PCT Pub. No. WO94/15747 PCT Pub. Date Jul. 21, 1994.When a laser beam machining command is detected in a pre-processing step in which a machining program is analyzed to create execution data for carrying out a laser beam machining operation, a drive for rotation command is outputted to a means for driving an impeller, and when it is detected that the rotational speed of the impeller has reached a predetermined speed within a predetermined time period, laser beam machining is started. If the rotational speed of the impeller has failed to reach the predetermined speed within the predetermined time period, an alarm is outputted. With this arrangement, the rotation of the impeller, which is necessary for the protection of optical components, can be controlled properly without the need of separately defining impeller rotation-related commands in the machining program.
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