Device for inducing slack in a wrapping film, associated with means for conveying packs of rolls

A device for enveloping packs of rolls assembled and packaged by a non-continuous machine, comprising:

• an overhead conveyor means;
• a first wrapping station, equipped with a vertical elevator by which a pack of rolls is directed upward into contact with a sheet of wrapping film disposed transversely between the elevator and a pair of vertical teeth supported from above by the overhead conveyor means, said vertical teeth disposed parallel to each other and separated by a set distance along a horizontal feed direction, between which the rolls are restrained and supported by pressure on each side together with the sheet of wrapping film and carried along the horizontal feed direction;
• at least one additional vertical tooth of fixed embodiment secured to a support afforded by the machine, at said first wrapping station, said first vertical tooth positioned adjacent and offset from a vertical tooth of the conveyor means lying farther from a downstream folding station in relation to the feed direction and separated from a conveyor tooth nearer to the downstream folding station by a distance less than the distance which separates the two conveyor teeth, such that the ascending rolls are restrained at first between the shorter distance located between the movable conveyor tooth closest to the folding station and the fixed vertical tooth so that the partly enveloping sheet of wrapping film is initially drawn taut, whereupon a translatory movement of the conveyor teeth in the feed direction allows for a wider distance in which the rolls are positioned between the two conveyor teeth and creates a partial release of the enveloping film thereby extending the amount of film allowed to lay across the peripheral length of the rolls, prior to folding and heat sealing overlapping edges of said wrapping film.