Patent ID: 7614328

Claim:
An apparatus for causing paper webs to tear off within rewinding machines, the apparatus comprising: a rewinding machine including a web-feeding roller having a tubular jacket outer surface, said tubular jacket outer surface having a plurality of openings; a web having transverse perforation lines at regular intervals, one perforation line and another perforation line defining a sheet of said web a pneumatic tearing means for tearing of said web upon receiving one of said perforation lines of said web which separates a last sheet of a log being formed from a first sheet of a next log to be formed, wherein said pneumatic tearing means comprises a reservoir of compressed air and a plurality of nozzles associated with a plurality of solenoid valves, said plurality of nozzles and said plurality of solenoid valves producing a jet of compressed air in a direction of said one of said perforation lines said nozzles with said solenoid valves and reservoir being positioned within said web-feeding roller, said openings receiving said jet of compressed air via said nozzles, said tubular jacket rotating about a longitudinal axis thereof, said reservoir being fixed such that said reservoir does not rotate about a longitudinal axis thereof.