Assembling method for forming bead assembly for automobile tires

Abstract

A method for forming an automobile bead assembly comprises three series of steps. The first series includes placing a bead ring onto the smaller-diameter side surface of a taper drum, winding a bead filler around the peripheral surface of the taper drum such that the thick-walled portion thereof projects over the smaller diameter surface of the drum, bonding the ends of the filler together, bending the thick-walled portion along the smaller-diameter side edge to join it to the bead ring, and separating the front end portion of the filler from the peripheral surface of the drum. The second series includes winding a side ply around the outer periphery of a cylindrical forming drum, bonding the ends together, winding a bead flipper around the side ply while part of the flipper overlaps the side ply, and joining the ends of the flipper together. The third series includes removing the filler/bead ring subassembly from the taper drum and placing it onto the single layer of the flipper on the forming drum, bending the inward portion of the flipper such that it extends along the inside of the bead ring and filler, bending the portion of the flipper and side ply, which projects outwardly of the bead ring such that it extends along the outer surfaces of the filler/bead ring, and bending the overlap region of the flipper, side ply and filler such that the side ply lies on the periphery thereby providing a conical form.