Film stretching mechanism

B - Operations – Transporting – 65 – H

Patent

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Details

B65H 23/182 (2006.01) B65B 11/02 (2006.01) B65B 11/30 (2006.01) B65H 23/14 (2006.01) B65H 23/26 (2006.01)

Patent

CA 2232577

A pre-stretching mechanism, for use in an orbital wrapping apparatus whereby a web (6) of plastics film is drawn from a feed roll (5) of film and applied to an object to be wrapped by virtue of relative rotational movement of the object and the roll, comprises a braking roller (9) in contact with the feed roll, a stretching roller (7) in contact with the web and drive transmission means (10, 11, 12) connecting the rollers such that the surface speed of the stretching roller in the direction of film movement exceeds that of the braking roller in that direction, wherein the feed roll is mounted for rotation upon slideable saddles (16) and the contact pressure between the braking roller and feed due to tension in the drawn-off web is augmented by loading springs (18) to an extent such that slippage occurs between the feed roll and the braking roller before draw-off tension in the web reaches a value at which the web would neck down and break.

Mécanisme de pré-étirement, destiné à un appareil d'emballage orbital, dans lequel une bande de pellicule plastique est étirée depuis un rouleau d'alimentation (5) de pellicule et appliquée à un objet devant être enveloppé par le mouvement rotatif relatif de l'objet et du rouleau, constitué d'un rouleau de freinage (9) en contact avec le rouleau d'alimentation, d'un rouleau d'étirement (7) en contact avec la bande et de dispositifs de transmission (10, 11, 12) reliant les rouleaux, de telle sorte que la vitesse de surface du rouleau d'étirement dans la direction du mouvement de la pellicule dépasse celle du rouleau de freinage dans cette direction, le rouleau d'alimentation étant monté pour rotation sur des étriers coulissants (16) et la pression de contact entre le rouleau de freinage et l'alimentation, du fait de la tension dans la bande étirée, est augmentée par des ressorts de charge (18) suffisamment pour qu'un patinage se produise entre le rouleau d'alimentation et le rouleau de freinage avant que la tension d'étirement dans la bande atteigne une valeur telle que la bande s'incurve et se déchire.

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