Apparatus for forming containers equipped with a reversible pocket of thermoplastic film

Claim 1

IN A MACHINE FOR PRODUCING RECTANGULAR CONTAINERS EACH EQUIPPED WITH A PAIR OF OPEN SIDES AND HAVING A REVERSIBLE POCKET SUSPENDED THEREIN FROM THE UPSTANDING PERIMETIC EDGES OF ONE OF SAID OPEN SIDES, A FRAME, AN ENDLESS CONVEYOR MOVABLY MOUNTED IN SAID FRAME, SAID CONVEYOR HAVING A PLURALITY OF PARALLEL CROSSBARS EACH EQUIPPED WITH MEANS FOR SUPPORTING A CONTAINER OF THE CHARACTER SPECIFIED, MEANS ON SAID FRAME FOR SEQUENTIALLY PRESSING UNSEVERED PORTIONS OF A CONTINUOUS PLANAR THERMOPLASTIC FILM INTO CONTAINER SUPPORTED ON SAID CROSSBARS, SAID PRESSING MEANS BEING EQUIPPED WITH A MALE DIE FOR PARTIALLY DEFORMING SAID FILM AND WITH A FEMALE DIE HAVING VACUUM DRAWING MEANS ASSOCIATED THEREWITH FOR DRAWING SAID FILM INTO CONTACT WITH SAID FEMALE DIE, MEANS ON SAID FRAME ADJACENT TO AND PRECEEDING SAID PRESSING MEANS IN THE PATH OF CONVEYOR TRAVEL FOR HEATING SAID FILM, AND MEANS ON SAID FRAME ADJACENT TO AND PRECEDING SAID HEATING MEANS IN THE PATH OF CONVEYOR TRAVEL FOR UNITING PORTIONS OF SAID FILM TO THE UPSTANDING PERIMETRIC EDGES OF SAID CONTAINERS.