Device for automatic insertion of a strip of synthetic film into a transverse drawing machine

A drawing system comprising:

• a longitudinal drawing machine;
• an auxiliary winding mandrel disposed at and below an exit of the longitudinal drawing machine;
• a transverse drawing machine, said transverse drawing machine having two endless chains carrying tenters designed to grip edges of the film, the two chains spaced apart from each other, with the two chains passing, adjacent to an entrance of the transverse drawing machine, onto reversing pulleys;
• and
• a device for automatic insertion of a strip of synthetic film coming from the longitudinal drawing machine into the transverse drawing machine, wherein said device for automatic insertion comprises:
• a fixed cylinder with an axis perpendicular to a travel axis of the film, located upstream of the entrance to the transverse drawing machine, a lower generatrix of said fixed of said fixed cylinder being located in a travel plane of the film in the transverse drawing machine,
• a chest having a slot provided in an upper surface of the chest and having an axis perpendicular to the travel axis of the film, mounted on a movable support, displaceable between a retracted position and a position in which the chest is located between said fixed cylinder and the entrance to the transverse drawing machine, the upper surface of the chest then being disposed substantially in the film travel plane in the transverse drawing machine, the chest serving to accomodate at least one knife displaceable in the direction of the chest axis and retractable so that it either projects or does not project beyond said slot, and
• two lifters, each of said lifters being in working relation with a reversing pulley of the transverse drawing machine for displacing the film between a lower position and a position in which it is located in a travel plane of the film tenters.