Patent ID: 9724886
Date: 2017-08-08
CPC Classifications: B29D

Claim:
1. A process for building a tyre for vehicle wheels, comprising: arranging a carcass sleeve comprising a carcass ply on a shaping drum comprising first and second half drums, first and second supports, and first and second sets of guide rods, the first support being operatively associated with the first half-drum, the second support being operatively associated with the second half-drum, the first set of guide rods having first ends integral with the first half-drum, the second set of guide rods having first ends integral with the second half-drum, and each support carrying a plurality of turning-up levers having free ends positioned close to its respective half-drum, wherein the carcass sleeve disposed on the first and second half-drums covers at least said free ends; arranging two annular anchoring structures around the carcass sleeve; locking each of the first and second supports relative to its associated half-drum by moving a flange mounted on the respective support to an engagement position in which second ends of the set of guide rods integral with the associated half-drum are locked in openings of said flange, wherein the first and second sets of guide rods are interposed respectively between said first and second supports and their associated half-drums; setting a threaded shaft in rotation for giving a toroidal conformation to the carcass sleeve while forces urging each half-drum towards its associated support are borne entirely by the locked guide rods; unlocking each support from its associated half-drum; and setting said threaded shaft in rotation for lifting the free ends of said turning-up levers until turning up end flaps of the carcass sleeve around the annular anchoring structures.