device for controlling the separation of reel-wound websheets, winding machine, and operational method for controlling the separation of websheets in winding machines

摘要

Device for controlling the separation of the sheets of paper webs rolled in the form of logs, comprising a guide roller (RA) cooperating with further means (R4, R5) for rolling a paper web (2) so as to form a paper log and cooperating with means for providing pre-incision lines on the paper web (2) so as to divide it in multiple separable sheets. The device comprises pneumatic separation means (SP) adapted to direct a fluid jet (J) toward a pre-incision line (p) which separates the last sheet (LS) of a log (RO) in the course of formation from the first sheet (FS) of a subsequent log to be formed. The pneumatic separation means (SP) are inside the guide roller (RA) and the latter has an outer surface (72) with a plurality of through holes (73) allowing the fluid jet (J) produced by the pneumatic separation means (SP) to be directed towards the pre-incision lines (p). The device comprises suction means (200, 201) arranged downstream of the separation means (SP) relative to a direction (K) of rotation of the guide roller (RA). The suction means (200, 201) are inside the guide roller (RA). The suction means (200, 201) provoke a suction through the holes (73).