| 摘要 |
PURPOSE:To extend the life of a nozzle by providing a replaceable annular or protruded protective device which is projected from the tip of the nozzle by more than 0.2mm. CONSTITUTION:A screw-in type annular protective ring 10 is provided at the tip of a nozzle 7 so as to be projected from the tip of the nozzle by a dimension A so that the tip of the nozzle is not contacted with a work directly. The dimension A is preferably 0.2-2mm and brass or Al is recommended as the material. In order to avoid a harmful effect of stopping up, it is effective to adjust the dimension A by providing an adjusting screw 12 on the circumference of a base 11. With this constitution, the workability can be stable for a long period and the life of the nozzle can be extended. |
