Patent ID: 7454938

Claim:
A plant for winding into a coil a band-type product ( 1 ) running along a longitudinal direction, including a winding chuck ( 2 ) driven into rotation around an axis orthogonal to the running direction and having a cylindrical external face ( 20 ), means ( 7 ) for guiding the band ( 1 ), along a tangent running plane (P), upstream of a deflecting roll (D) and, downstream, of the chuck ( 2 ), means ( 3 ) for the application of the band ( 1 ), by an internal face ( 11 ), on the chuck ( 2 ) along a back-up generatrix ( 23 ) and a bending plate ( 4 ) having a curved face ( 41 ) for guiding the band ( 1 ) along the external face ( 20 ) of the chuck ( 2 ), said means of application including an application roll ( 3 ) revolving around an axis ( 31 ) parallel to the axis of the chuck, and a means ( 62 ) for pushing said roll ( 3 ) towards the chuck ( 2 ) along a pushing plane (Q) running substantially through the axes ( 21 ) of the chuck ( 2 ) and ( 31 ) of the application roll ( 3 ), the application roll being driven into rotation around its axis ( 31 ) in a reverse direction relative to direction of rotation of the chuck ( 2 ), and at a corresponding tangential velocity, for applying a driving downstream on each of both faces, respectively internal ( 11 ) and external ( 12 ) of the band ( 1 ), characterised in that the application roll ( 3 ) is mounted rotatably directly on a mobile supporting chassis ( 6 ) whereon rests at least one hydraulic jack ( 62 ) as the means for pushing the application roll ( 3 ) towards the chuck ( 2 ), and resting, in an opposite direction, on a fixed portion, in order to exert an adjustable pinching force on the band ( 1 ) between the chuck and the application roll ( 3 ), in that an additional roll ( 5 ) is mounted rotatably upstream of the application roll ( 3 ) on said mobile chassis ( 6 ), and driven into rotation around its axis ( 51 ) in a reverse direction relative to the chuck ( 2 ) and at a tangential velocity corresponding to the velocity of the chuck, and in that said additional roll ( 5 ) is slightly spaced apart from the running plane (P) between the deflecting roll (D) and the chuck ( 2 ) by a distance corresponding to a predictable bending effect of the band ( 1 ) upstream of the application roll ( 3 ), taking its rigidity into account.