Importance

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Abstract

A parallelogram feed system for packaging film is provided. The system includes a pair of idler guide rollers bodily movable between a feed position adjacent the packaging film and a rest position away from the packaging film. Drive rollers are provided away from the packaging film. An endless belt extends around the rollers and engages the packaging film between the two guide rollers when in the feed position. The rollers are linked together by four connecting links in the shape of a parallelogram that are pivotally attached to the shafts to which the rollers are rotatably mounted. A pneumatic cylinder moves the guide rollers between the feed and rest positions. The cylinder is attached to the link connecting the two guide rollers by means of a pin slidably received in an elongated slot in the connecting link so as to allow parallelogram shifting movement. In addition, optional air passages may be provided for directing a cushion of air beneath the packaging film adjacent the feed system belts. The air cushion lifts the film from the mandrel of the packaging machine into contact with the belts while reducing dynamic friction between the film and the mandrel. In an alternative embodiment, dual piggyback belts are provided in lieu of a single feed belt, the outer feed belt engaging the film and the inner belt serving as the driver. The surface of the feed belt is matched for maximum affinity to the film and the drive belt exhibits maximum driving capability and extended life.

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First Claim