| 摘要 |
PURPOSE:To adjust the lower limit position of a ram by providing an adjusting screw having a rotation driving device on the ram, and placing an unloading valve unloaded by pushing motion of a push rod, on a frame side. CONSTITUTION:A worm wheel 11 is provided in a case 10 of the back of a ram 3, and an adjusting screw 12 is placed so as to be rotatable in an axial core. On a frame side, a lever 20 of an unloading valve 19 is placed so as to be opposed to the lower end of the screw 12. When the tip of the screw 12 contacts the lever 20 of a lower limit setting valve by descent of the ram 3, pressurized oil in a descending circuit is drained and the ram 3 stops. At the time of this bending, when the adjusting screw 12 is moved upward by rotating a handle 17, the lower limit set position moves downward, and the ram 3 moves downward by that portion. The lower limit position is adjusted by this method, and a trial bend time is also shortened. |
