TYRE CARCASS BUILDING DRUM AND OPERATING METHOD OF SAID TYRE CARCASS BUILDING DRUM

摘要

A tyre carcass building drum (1) having a longitudinal axis (3) and two half drums (6) movable along the longitudinal axis (3) in opposite directions away from and towards a centre plane (4) of the drum (1) each one comprising a bead carrying device (16) defining a saddle and a turn up device (41) designed to turn up a annular side portion (42) of a carcass ply around and on the outside of a respective bead ring; the turn up device (43) having an end portion arranged at rest along a peripheral annular portion (18) of the saddle (17) and shaped so as to define an extension of the curvilinear profile of the saddle (17); and thrust means (50) being provided to directly and independently exert an axial thrust and a radial thrust on the turn up device (43). The invention also relates to an operating method of said drum.