| 摘要 |
PURPOSE:To prevent an off-center phenomenon by providing a rotation regulation groove to regulate the rotating direction of a lens case to the inside of a torch main body and providing a window hole to rotate a rotational nut on the torch main body to prevent the rotation of the lens at the time of adjusting focus. CONSTITUTION:In the case of adjusting the focus of a laser beam, when a lock ring 23 is rotated in the direction where a lock nut 22 is loosened, the nut 22 is moved upward and separated from the abutment on the upper end face of the lens case 15. The ring 23 is pressed and a bar-shaped tool is inserted from the window hole 21 and engaged with an engaging hole 20 provided to the rotational nut 19 to rotate the rotational nut 19 normally and reversely. Since a projection part 18 is regulated only in the rotating direction with the rotation regulation groove 17 provided to the torch main body 11, the lens case 15 screwed on the nut 19 moves only in the vertical directions and the focus of the laser beam projected from a nozzle 12 is adjusted. After the focus is adjusted, the ring 23 is again rotated and the lock nut 22 is abutted on the lens case 15 which is locked at the focusing position. |
