| 摘要 |
PURPOSE:To execute laser beam machining without a hindrance by forming the focus on the surface of a work by providing a contactor so as to be brought into contact with the work and operating an external operating means for displacing an interval between a detecting means for detecting the displacement of the contactor and the contactor. CONSTITUTION:When a contactor 20 is detached from a work W by some cause and drops down to the lowering end, its displacement is detected by a detecting means 25 and a working head 5 is moved to the lower part. When an operating lever 27 reaches an abutting piece 38 of the lower part in the course of working of the working head, it turns clockwise against a leaf spring 34. The detecting means 25 operates to the lower part from a fixed position and sets an interval to a reflecting plate 23 to a reference distance (l), therefore, a lifting motor 4 stops its rotation. Since the working head 5 stops its lowering and holds its position, it does not occur that the working head rushes into a table 16. In such a manner, working is executed exactly by forming the focus of a laser beam on the surface of the work, and also, when the contactor operates exceeding a work range, the detecting means side is operated by an external operating means and the lifting of the working head can be controlled. |
