| 摘要 |
PURPOSE:To realize simplification of construction by forming a concave where a stem unit of a tapper valve or the like is inserted into a hydraulically operated plunger and by allowing idle operation between the stem and the plunger to control number of operating cylinder. CONSTITUTION:In noraml operation, a plunger 21 is in the position shown in the figure and the upper end of the stem 14 of an air supply/exhaust valve 11 is inserted in the groove 31 of the plunger 21. Therefore when a body 19 is slided in a cylinder 18 by the rotation of a cam 10, the air supply/exhaust valve 11 is opened and closed through the plunger 21. Next in operation with reduced number of operating cylinder when a solenoid valve 28 is opened, operating oil pressure is supplied into a hydraulic chamber 23 from a hydraulic source 29 through a passage 27 and a groove 26, and the plunger 21 is moved to the left against a spring 20. Then, the upper end of the stem 14 is inserted into the long hole 32 of the plunger 21. In this condition, valve opening force is not transmitted to the air supply/exhaust valve 11 regardless of sliding of the body 19, and operation of the air supply/exhaust valve 11 is stopped. |
