Apparatus and method for detecting when a web is not being...

B - Operations – Transporting – 26 – D

Patent

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Details

B26D 5/00 (2006.01) B26D 7/22 (2006.01) B26F 1/20 (2006.01)

Patent

CA 2408404

The present invention provides a web perforating apparatus (10) which includes a system for detecting and indicating when a blade in the apparatus is broken, dull or otherwise not perforating the web. The apparatus comprises at least one anvil (80) including a blade holder (42) and an anvil blade (45) which is positioned within the blade holder. The blade holder is formed of an insulating material for electrically isolating the anvil blade from the machine frame of the rewinder. An electrical conductor is coupled to the anvil blade for supplying an electric current to the anvil blade from a current source. The apparatus also includes at least one grounded perforating blade (21) for moving relative to the anvil blade and cooperating with the anvil blade to perforate the web at predetermined points along its length. The perforating blade will contact the anvil blade after perforating the web. A closed circuit is formed and maintained along the anvil blade at points where the blades are in contact with each other.

L'invention concerne un appareil de perforation (10) d'une bande continue, lequel comprend un système destiné à détecter et indiquer qu'une lame de l'appareil est cassée, non affûtée, ou autre, et qu'elle ne perfore pas la bande. Cet appareil comprend au moins un contre-outil (80) comportant un support de lame (42) ainsi qu'une contre-lame (45) positionnée dans le support de lame, lequel est formé dans un matériau isolant de manière à isoler électriquement la contre-lame, du cadre machine du dispositif de bobinage. Un conducteur électrique est couplé à la contre-lame de façon à fournir un courant électrique à celle-ci, à partir d'une source de courant. Cet appareil comprend encore au moins une lame perforante (21), mise à la terre, destinée à se déplacer par rapport à la contre-lame et coopérant avec cette contre-lame pour perforer une bande au niveau de points déterminés sur la longueur de cette bande, la lame perforante entrant en contact avec la contre-lame après perforation de la bande. Un circuit fermé est formé et conservé le long de la contre-lame au niveau des points où les lames entrent en contact l'une avec l'autre.

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