On demand cross web perforation

B - Operations – Transporting – 26 – D

Patent

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Details

B26D 1/62 (2006.01) B26D 5/20 (2006.01) B26F 1/20 (2006.01)

Patent

CA 2247365

A moving web (11) is either perforated or cut using a knife cylinder (15) having at least one blade (16) and an anvil cylinder (18) having at least one raised anvil surface (19), and preferably a plurality (e.g. about 22) of alternating substantially uniform raised surfaces (21) and depressions (72). The knife cylinder (15) is substantially continuously rotated, and the anvil cylinder (18) is substantially continuously rotated by a servo motor (20), which also positively controls the position of the anvil cylinder (18) with respect to the knife cylinder (15) to selectively either effect perforation or cutting of the web, or no perforation or cutting. Position controlling is typically accomplished by substantially constantly and instantly indexing the anvil cylinder (18) in a reverse direction. Sensors may be utilized for sensing the locations of the knife and anvil cylinders and providing that information to a computer controller to facilitate indexing.

Une bande continue en mouvement (11) est soit perforée soit coupée à l'aide d'un cylindre porte-couteau (15) comportant au moins une lame (16), et d'un cylindre support (18) présentant au moins une surface support surélevée (19) et de préférence une pluralité (environ 22, par exemple) de surfaces surélevées sensiblement uniformes (21) alternant avec des dépressions sensiblement uniformes (72). Le cylindre porte-couteau (15) tourne sensiblement en continu, et un servomoteur (20), qui commande aussi le positionnement forcé du cylindre support (18) par rapport au cylindre porte-couteau (15), fait tourner de manière sensiblement continue le cylindre support (18) de façon à sélectivement perforer ou couper la bande continue, ou à ne pas la perforer ou ne pas la couper. La commande de positionnement se fait typiquement par un positionnement sensiblement constant et instantané du cylindre support (18) en direction opposée. Des capteurs peuvent être utilisés pour détecter les localisations du cylindre porte-couteau et du cylindre support, et pour fournir ces informations à un contrôleur d'ordinateur afin de faciliter le positionnement.

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