| 摘要 |
<p>PURPOSE: To surely perform hydraulic pressure by connecting high-pressure and low-pressure circuits provided in parallel to an operation cylinder by way of high-pressure and low-pressure valves which come in touch with a cam disk performing adjustments in target value and driven by a target-value motor. CONSTITUTION: Low-pressure circuit 34 for high-speed drive and high-pressure circuit 33 for load feed drive are provided in parallel, high-pressure regulating valve 8 and low-pressure regulating valve 9 are provided in an operation cylinder 1, spools 14, 15 of the high-pressure valve 8 and low-pressure valve 9 are brought into contact with a disk cam 26 driven by a target-value motor 27 and the high-pressure circuit 33 and low-pressure circuit 34 are connected to the high-pressure regulating valve 8 and low-pressure regulating valve 9, respectively. Thereby, from the point of advantageous output saving, exchange of operation pistons 2 can be performed without any problem relating to speed, feeding pressure and direction of movement. Furthermore, the shortest possible time of operation cycle can be achieved and the necessary hydraulic control can be surely performed.</p> |
