Ply-turning device for use in tire-building

摘要

A ply-turning device for use in tire-building is disclosed herein which is adapted to turnup a surplus portion of a carcass ply around a bead core in the manufacture of large size tires each having a pair of axially protruding side portions. The device comprises a plurality of ply-turning vanes being arranged concentrically to a first drum for the formation of a green case and circumferentially in the form of a cylinder at a collapsed position and being movable from the collapsed position to an opened position of a frustoconical shape in opposition to each axially protruding side edge portion of the drum by means of link means, a hydraulically driving means moving toward and away from the drum, and a retractably moving means for moving all the ply-turning vanes together with the link means.