| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate cleaning for a torch and a torch holder and an adjustment for a collision detector and to lessen an invasion of noises into a controller by simplifying a structure around the torch. SOLUTION: A torch 3 is inserted into a torch inserting hole 17 of a torch holder 5. A torch supporting part 19 which is provided in the outer periphery of the torch 3 is freely brought into contact with or separated from the upper surface of the torch holder 5. A movement of the torch supporting part 19 when the torch 3 collides is transmitted to a lever 35 capable of freely rocking which is provided in a machine main body with a power transmission device and sensed with a collision detector 27. The power transmission device is composed of a tubular coat part 31 and a power transmission wire 33 which is inserted through the coat part, one end of the coat part 31 is attached to the torch supporting part 19 and the other end of the coat part 31 is attached to a torch collision detecting part 23. The power transmission wire 33 and the coat part 31 are energized with an energizing means in the relatively separating direction so that the torch supporting part 19 is always brought into press- contact with the torch holder 5, and the torch 3 is protected without being damaged by the energizing force even though the torch 3 collides with an obstacle.</p> |
