Roller for conveying a web or sheet of paper in paper converting machines and conveying method thus obtained

摘要: The roller (1) is used for conveying a web or sheet of paper (20) in converting machines, example, a rewinding, winding, an interfolding machine. It comprises first outer cylindrical tubular body (2) equipped with plurality of radial holes (3), arranged according to substantially longitudinal rows, capable of rotating respect second inner fixed (4) coaxial to it and connected suction system. second body has geometry like the first body (2) apertures (5) two radial boards (7) arranged at opposite sides respect to (5). surface first cylindrical (2), together radial boards external second tubular (4), define chamber (6) that brings selectively communication selected rows (3) of the apertures (5) then the suction system machine during relative rotation of two bodies. Therefore, sheet (20) adheres only in portion P 1 2 set between of holes (3') communicates chamber (figure 4).