| 摘要 |
PURPOSE:To contrive a reduction of adjusting hours by making a position of a prepinch bar adjustable automatically, by constituting the title device so that the prepinch bar is stood on an elevator rest of a down blow device for performance of a blow to parison in a mold so that the prepinch bar can be expanded and contracted. CONSTITUTION:In the case where molds 1a, 1b are exchanged with smaller size ones, an elevator rest 11 is raised by running along a screw rod 10 and down blow pin 3, for example, is moved to a position of dot and dash line. However, in this instance, since the prepinch bars 24a, 24b can be moved integrally with the elevator rest 11 through pinch bar supporting rests 21a, 21b, the prepinch bars 24a, 24b are raised up to the position of the chain line with one dot by following raising of the down blow pin 3 and they can be allowed to correspond to positions of the fresh molds 1a, 1b. Therefore, the prepinch bars 24a, 24b are moved to a position of a broken line from the position of the dot and dash line by keeping a height position as it is on the same level by an expanding and contracting device 30 under this state and the lower end of the parison 2 can be pinched by a pinch part 23. |
