| 摘要 |
This application relates to parallel blank mold opening mechanism wherein the split blank molds, of which there are a plurality, are carried in holders that are mounted on horizontal hinge pins adjacent the rear thereof. These hinge pins are carried at the upper end of crank arms and move toward and away from each other during the cycle of operation of a pneumatic motor. Each of the mold holders is provided with a parallel link which is connected between the base of the mold mechanism housing and the holder, such that upon opening and closing of the mold the faces of the molds are maintained in a vertical plane. In addition, the position of the axes of the crank shafts and the hinge pins are such that the hinge pins move over top dead center or through the vertical plane defined by the axis of the crank shaft upon opening or closing. In this manner the molds are actually lifted a slight amount during movement from their closed to their open position. The molds, of which there are three in number disclosed, are held in closed position with equal closing forces due to the fact that the mold holders on one side are pivoted from a central pivot and the mold holders on the other side are split so that the two halves of the mold holders are each individually pivoted about vertical pivot pins. |
