| 摘要 |
<p>PURPOSE:To perform quick and reliable switching of operation and no-operation, by engaging a sliding body inwardly with a sleeve, and installing a plunger to the inside of the sliding body provided at the inside thereof with a check ball. CONSTITUTION:During usual operation, a high-pressure chamber 29 is filled with hydraulic oil through the working of a pump 55 by pushing down a check ball 35 of each of dynamic valve devices 5a and 5b after passage of it through a feed passage 57, and thereafter, the check ball 35 closes an orifice passage 23, whereby a slide body 13 is secured to a sleeve 11. Thus, with a cam 3 turned, a locker arm 19 of each of the dynamic valve devices 5a and 5b slides around a shaft 17, and a suction exhaust valve 21 is actuated. With a cylinder-reducing switch 53 turned ON, a rod 49 of a solenoid 47 moves donward and forcibly presses the check ball 35 to communicate a high-pressure chamber 29 with a low-pressure chamber 27. When the cam 3 turns to push upward the locker arm 19, the slide body 13 is raised in a condition to discharge the hydraulic oil in the high-pressure chamber 29 by use of a relief valve 65, and thereby the suction and exhaust valve 21 is brought to an inoperative state.</p> |
