Variable-pitch arm star construction for rotary molding machines for making, by drawing and blowing, plastic vessels and bottles, and rotary molding machine comprising the star construction

摘要

A star construction having variable pitch arms for a rotary molding machine for making plastic vessels and bottles, comprises a plurality of arms including gripper elements and a system including two levers which engages with the grippers, while cooperating with respective cam contours, the lever and cam system being reciprocatedly driven for providing a pitch variation and controlling the positions of the gripper elements. ;With respect to prior solutions, the variable pitch arm star construction according to the invention allows to quickly and simply perform the operations necessary for modifying the arm pitch.