| 摘要 |
In a process for building tyres for vehicle wheels, a carcass sleeve (3) is arranged on a shaping drum (1) comprising two half-drums (15) and two supports (16). Each support is operatively associated with one of the half-drums (15) and carries a plurality of turning-up levers (28) having free ends (28b) positioned close to the respective half-drum (15). Two annular anchoring structures (4) are disposed around the carcass sleeve (3) and each of the two supports (16) is locked to the respective half-drum (15) by interposing only stiff mechanical elements in mutual contact between the support (16) and the half-drum (15). The carcass sleeve (3) is shaped in a toroidal conformation, by setting a threaded shaft (27) in rotation and moving the half- drums (15) close to each other. Subsequently, each of the two supports (16) is unlocked from the respective half-drum (15) and the threaded shaft (27) is set in rotation to move each support (16) close to the respective half-drum (15) and lift up the free ends (28b) of the turning-up levers (28) until the end flaps of the carcass sleeve (3) are turned up around the annular anchoring structures (4). |
