Draw roller for strip-like materials, in particular paper or...

Details Draw roller for strip-like materials, in particular paper or... Draw roller for strip-like materials, in particular paper or...

B - Operations, Transporting

65

H

B65H 20/12 (2006.01) F16C 13/00 (2006.01)

Patent

CA 2343908

Draw rollers for striplike materials (especially paper or cardboard strips, plastic or metal foils), having a sheath (1) that can rotate around a fixed inner component, whereby said sheath is provided with air holes along the entire surface thereof, are already known per se. A vacuum chamber (8) is arranged in the winding area of the strip. Said vacuum chamber (8) can be subjected to an underpressure. According to the invention, another vacuum chamber (8) is arranged inside the sheath (1) in the running direction of said strip (2) directly in front of the vacuum chamber (8), whereby the underpressure in the second vacuum chamber is greater than the underpressure in the first vacuum chamber (8) and is independent thereof. The upstream second vacuum chamber (8) enables the separating layer of air adhering to the strip (2) to be suctioned in a targeted manner, whereby the contact surface of the strip (2)/ roller remains large enough to transmit high drawing forces.

On connaît des cylindres de traction destinés à des matériaux en bandes (bandes de papier ou de carton, films en plastique ou métal) et présentant une enveloppe (1) qui peut être entraînée en rotation autour d'un composant interne fixe et qui présente sur toute sa surface des orifices de passage d'air. Une chambre à vide (8), placée dans la zone d'enroulement de la bande (2), est alimentée en pression négative. Selon l'invention, une autre chambre à vide (7) est placée à l'intérieur de l'enveloppe (1) juste devant la chambre à vide (8) dans le sens de défilement de la bande (2). On peut régler dans cette autre chambre à vide (7) une pression négative supérieure la pression négative régnant dans la chambre à vide (8) indépendamment de cette dernière. La deuxième chambre à vide (7) amont permet d'aspirer de façon ciblée la couche de séparation d'air adhérant à la bande (2) de telle façon que la surface de contact de la bande (2)/du cylindre demeure suffisamment grande pour transmettre des forces de traction élevées.

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