| 摘要 |
PURPOSE:To enable to smoothly advance and retreat and consequently surely connect and disconnect a cavity with a suction passage by a constitution wherein the advancing and retreating movements of a pin equipped with a valve is interlinked with the action of an ejector plate. CONSTITUTION:A cavity 6 is formed on the opposite contact surface of a retainer plate, while an ejector plate 12 is provided on a movable retainer plate freely shiftably back and forth. A pin 14, at the tip part of which a valve 141 is equipped, and a return pin 15 are mounted to the ejector plate. An air suction passage 17 is provided on the movable retainer plate 1 side so as to communicate through a connecting hole 161 to form the tip part of a pin hole 16, in which the pin 14 is inserted, with the cavity 6. The valve 141 can protrude forward beyond the connecting hole 16, which is open when the valve is at its protruded position and closed when the valve is at its retreated position. In other words, the backward and forward shifting of the valve by the predetermined distance opens and closes the connecting hole so as to connect and disconnect the cavity 6 with the suction passage 17. |
