Tire molding drum and molding process of tire.

摘要

A tire building drum (1) comprising: a pair of bead lock means (7) adapted to be displaced toward and away from each other and therefore expand and contract; means withdrawal of carcass band (8), positioned adjacent to the bead lock means, respectively; and a central shaft (2) for supporting this medium; at least one core body (10) in an axial inner portion of said locking member heel (7), said core body comprising a plurality of sheets of rigid support members (10a) arranged in toroidal form and adapted to be displaced and thereby expanded or contracted; and center bladder (9) deformable for expansion or contraction, which extends in a radial outside of said core body (10), and which has both axial side portions adapted to be displaced toward or away from one another integrally with said bead lock (7), respectively medium; the drum being characterized in that the central air chamber (9) can expand or contract independently of the movement of the rigid support members (10a), both in axial and in radial direction.