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AssigneePirelli Tyre S.p.A.
InventorsMaurizio Marchini, Henrique Scarmagnan Saraiva, Marco Lepore, Christian De Col
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A process and a drum for looping annular anchoring structures in a process for building tyres for vehicle wheels includes: depositing a loop on a drum including a radially expandable/contractible intermediate annular portion and, in a position axially adjacent to the opposite axial ends of the intermediate annular portion, a pair of radially expandable/contractible lateral annular portions; associating an annular anchoring structure with a radially outer annular surface portion of the loop defined at the intermediate annular portion; and turning up each of opposite end edges of the loop on the annular anchoring structure through the lateral annular portions as a result of a thrusting stress imparted by a respective lateral annular portion of the pair of lateral annular portions because of a synchronous radial movement and a synchronous axial displacement of a respective plurality of circumferentially adjacent first angular sectors.
A drum for looping annular anchoring structures in a process for building tyres for vehicle wheels, comprising a radially expandable/contractible intermediate annular portion and, in a position axially adjacent to opposite axial ends of said intermediate annular portion, a pair of radially expandable/contractible lateral annular portions, the intermediate annular portion and the lateral annular portions being configured to support a loop, wherein each lateral annular portion of said pair of lateral annular portions comprises a plurality of circumferentially adjacent first angular sectors, wherein each of the circumferentially adjacent first angular sectors is capable of a synchronous radial movement and a synchronous axial displacement to cause a thrusting stress imparted by the respective lateral annular portion to turn up an end edge of the loop on an annular anchoring structure arranged at the intermediate annular portion;
Dependencies are inferred from the claim text.