VARIABLE SHEET-LENGTH PERFORATION SYSTEM and corresponding method

A method and apparatus ( 20 ) for intermittently cutting a moving target web ( 26 ) includes rotating a knife roll ( 32 ) having at least one knife member ( 44 ) to provide an operative knife-member speed, and rotating an anvil roll ( 34 ) having at least one anvil member ( 46 ) to provide an operat...

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Bibliographische Detailangaben
Hauptverfasser:	BAGGOT, JAMES LEO, HADA, FRANK STEPHEN
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CONVEYING CUTTING DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING,CUTTING-OUT, STAMPING-OUT OR SEVERING HAND CUTTING TOOLS HANDLING THIN OR FILAMENTARY MATERIAL HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES PACKING PERFORMING OPERATIONS SEVERING STORING TRANSPORTING
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Beschreibung
Zusammenfassung:	A method and apparatus ( 20 ) for intermittently cutting a moving target web ( 26 ) includes rotating a knife roll ( 32 ) having at least one knife member ( 44 ) to provide an operative knife-member speed, and rotating an anvil roll ( 34 ) having at least one anvil member ( 46 ) to provide an operative anvil-member speed. The knife roll and anvil roll have been positioned to provide an operative nip region ( 30 ) therebetween, and a substantially continuous target web ( 26 ) has been moved at a selected web speed through the nip region. A rotational positioning of the knife member has been coordinated with a rotational positioning of its cooperating anvil member to provide an operative, cutting engagement between the knife member and its cooperating anvil member, thereby cutting the moving web at cut locations which are intermittently spaced along a machine-direction ( 22 ) of the target web.