Patent ID: 6814122
Filing Date: 2004-11-09
Classification: B29D

Abstract:
A radial tire forming apparatus comprising:first forming means for forming a carcass structure, comprising carcass band forming means in which a band forming former for forming a carcass band is provided, and an inner liner and a ply are laminated on said band forming former, by which a carcass band with an outside diameter smaller than the inside diameter of a bead core is formed; carcass forming means provided with a carcass forming former with a diameter smaller than the inside diameter of carcass band formed by the carcass band forming former and a rollover device for folding and wrapping the bead core; and carcass band conveying means for reciprocating said carcass band between said carcass band forming means and said carcass forming means; second forming means operative to wind a sidewall on said carcass structure completed by said first forming means in order to complete a green case; and third forming means operative to provide said green ease with a toroidal shape and thereafter to assemble a belt-tread structure, said third forming means including a shaping former for providing said green case with a toroidal shape, green case conveying means for receiving, conveying, and delivering said green case; belt-tread structure forming means; and belt-tread conveying means for conveying said belt-tread structure from a belt-tread forming former to a shaping former, wherein said rollover device comprises a frame on guide rails disposed in parallel with the forming former axis of said carcass forming means and moving longitudinally toward said carcass forming former; a driving unit for said frame; a guide shaft capable of moving longitudinally with said frame toward said carcass forming former disposed in parallel with said carcass forming former axis; a thin-wall, ring-shaped first rollover ring which is fixed at the end on the former side of said guide shaft and is disposed coaxially with said carcass forming former axis; and a thin-wall, ring-shaped second rollover ring which is mounted so as to be movable on said guide shaft and disposed coaxially with said carcass forming former axis, said rollover device being constructed so that said first and second rollover rings can be moved individually and synchronously, and further constructed to be mounted in a housing portion for supporting said carcass forming former, whereby said carcass forming former reciprocates between said second forming means and said first forming means, so that work for folding and wrapping the bead core of said rollover ring can be performed even during the movement of said carcass forming former.