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 (L) of web material into a plurality of small rolls (R), comprising:
- a unit (17) rotating about an axis (A--A) parallel to the axis of the log (L);
- on said unit a cutting blade (19), rotating at a substantially constant speed about an axis (B--B) parallel to the axis (A--A) of said unit (17), said blade being rotated by blade drive means;
- means (61, 63) which drive said cutting blade (19) into a reciprocating forward and backward axial motion parallel to the axis of the log (L);
- log-feeding means (3, 5, 7, 9) for feeding the log (L) to be cut in a forward direction parallel to the axis of rotation of said blade;
- wherein said log feeding means moves said log at a lower speed during cutting and at a higher speed between each two sequential cuttings performed on said log, said lower speed being equal to the speed of the axial motion of said cutting blade in the forward direction parallel to the axis of rotation of said blade, during a cutting operation of said blade;
- and wherein synchronizing means (94-100, 99-120, 353) are provided for keeping a synchronism between the reciprocating axial motion of the cutting blade and the log feeding means.
A method for transversal cutting of a log into a plurality of small rolls, comprising the steps of:
- providing a cutting unit;
- advancing said log toward said cutting unit with a continuous motion;
- providing a rotating cutting blade on said cutting unit;
- rotating said unit about an axis parallel to the axis of the log;
- rotating said rotating cutting blade at substantially constant speed in an orbit which has an axis which is parallel to the axis of the log, said blade performing subsequent cuts on said log perpendicularly to the axis of the log;
- providing a blade drive means for rotating said cutting blade;
- reciprocatingly moving said cutting blade in a direction parallel to the axis of the log;
- moving said log at a first lower feeding speed during cutting, said lower feeding speed substantially corresponding to the axial speed of said cutting blade during forward motion thereof, and at a second higher feeding speed between each two sequential cuttings performed on said log, while the cutting blade is moved backwards;
- and
- synchronizing the advancing movement of said log with the axial reciprocating movement of the cutting blade.
Dependencies are inferred from the claim text.