Machine for cutting logs of web material
AssigneeFabio Perini S.p.A.
InventorGuglielmo Biagiotti
Life of this patent
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Abstract
The machine cuts a roll or log (L) of web material into a plurality of small rolls (R). It includes a unit (17) rotating about an axis (A--A) parallel to the axis of the log (L) to be cut. The unit carries a cutting blade (19) rotating about an axis (B--B) parallel to the axis (A--A) of the unit (17). A driving device (61, 63) moves the cutting tool (19) into a reciprocating forward and backward motion parallel to the axis of the log (L) to be cut. At least at the time when the blade cuts the log, the blade moves parallel to the moving log at a translation speed substantially equal to the feeding speed of the log (L), so as to allow the cutting of small rolls (R) without stopping the log (L).
Claims14
A machine for cutting a log of web material into a plurality of rolls, said machine comprising:
- a unit rotating about a first axis;
- a cutting blade on said unit, said cutting blade rotating at a substantially constant speed about a second axis, said cutting blade being rotated by a drive;
- a driving device which moves said cutting blade in a forward and backward motion;
- a log feeder for feeding a log to be cut in a forward direction;
- wherein said log feeder moves said log at a lower speed during cutting and at a higher speed between each of two sequential cuttings performed on said log, said lower speed being equal to a speed of axial motion of said cutting blade in a forward direction parallel to an axis of rotation of said cutting blade during a cutting operation of said cutting blade;
- and wherein a synchronizer is present for maintaining synchronism between reciprocating axial motion of the cutting blade and motion of the log feeder.
A method for transversal cutting of a log into a plurality of rolls, said method comprising:
- providing a cutting unit;
- advancing a log to be cut toward said cutting unit in a continuous motion;
- providing a cutting blade on said cutting unit;
- rotating said cutting unit;
- rotating said cutting blade at substantially constant speed in an orbit, said cutting blade performing subsequent cuts on said log perpendicularly to an axis of the log;
- providing a drive for rotating said cutting blade;
- moving said cutting blade in a forward and backward motion;
- moving said log at a first lower feeding speed during cutting, said lower feeding speed substantially corresponding to axial speed of said cutting blade during forward motion of the cutting blade, and moving said log at a second higher feeding speed between each of two sequential cuttings performed on said log while the cutting blade is moved backwards;
- and
- synchronizing advancing movement of said log with axial reciprocating movement of the cutting blade.
Dependencies are inferred from the claim text.