| 摘要 |
A drum ( 1 ) of variable diameter of generally cylindrical form, intended for the assembly of the belt plies and profiled elements constituting the crown of a tyre, comprising a set of first holding means ( 3 ) arranged circumferentially at the equator of the drum and suitable for making that part of the ply arranged level with these means adhere to the surface of the drum, and characterised in that it comprises a set of second holding means ( 4 ) suitable for making that part of the ply placed level with said second means alternately adhere to or slide freely on the drum, and which are arranged circumferentially and axially on either side of said equator over the entire surface of said drum ( 1 ).
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