| 摘要 |
PROBLEM TO BE SOLVED: To create a rod guide and a method for arranging the rod guide in a blow nozzle, capable of attaining both an attitude support function of a longitudinal stretching rod and a flowability of a liquid at a high level, in a blow molding device using the liquid as a pressure medium.SOLUTION: A cylindrical rod-shaped shaft body is inserted in a blow nozzle, a cylindrical rod guide is connected to a lower end of the shaft body in a coaxial state, a stretching rod is inserted in the connected shaft body and the rod guide, the stretching rod is further inserted in the rod guide in a sliding state so as to be brought into contact with the inner periphery of the rod guide and a seal body is constituted of the shaft body, the rod guide and the stretching rod. A seal step part downwardly reduced in diameter is arranged to the blow nozzle and a valve mechanism is arranged so as to enable opening and closing of a liquid supply passage in the blow nozzle by the contact of the lower end part of the shaft body with the seal step part and the separation from the seal step part and the rod guide is fitted in the reduced diameter just under the seal step part in the closed state of the valve mechanism and upwardly detached in the opened state of the valve mechanism. |
