| 摘要 |
<p>A tire forming drum (1) provided with two half drums (3, 4) axially mobile relative to each other and arranged to support on their outer periphery tube plies of a carcass (2) to be formed, each half drum (3, 4) being arranged to produce automatic folding of the relative end (49) of said tubular plies about a respective annular bead (50) by means of a respective multiple air chamber element (38) rigid at one end with an outer flange (10) of the relative half drum (3, 4), and at the other end with a tubular support member (21) mobile under the thrust of said multiple air chamber element (38) between a retracted rest position inside said flange (10) and an extracted working position in which said tubular member (21) projects axially outward from the relative half drum (3, 4).</p> |
