Vacuum forming drum

Claim 1

IN A PACKAGING MACHINE FOR FORMING ARTICLES IN A THERMOPLASTIC STRIP, A DIFFERENTIAL PRESSURE ACTUATED FORMING DEVICE COMPRISING A FREELY ROTATABLE DRUM, A PLURALITY OF CIRCUMFERENTIALLY SPACED DEPRESSIONS FORMED ON THE OUTER PERIPHERY OF SAID DRUM, DIFFERNTIAL PRESSURE CREATING MEANS CONNECTED TO SAID DEPRESSIONS FROM WITHIN SAID DRUM, INDEPENDENT DRIVE MEANS FOR FEEDING A THERMALLY SOFTENED THERMOPLASTIC STRIP ONTO THE OUTER PERIPHERY OF SAID DRUM, SAID STRIP IMPARTING ROTATIVE MOVEMENT FROM SAID INDEPENDENT DRIVE MEANS TO SAID DRUM, DUAL POSITION CLAMPING MEANS ATTACHED TO SAID DRUM AND BEING ENGAGEABLE ABOUT SAID DEPRESSIONS IN ONE POSITION OF DRUM ROTATION AND BEING RADIALLY OUTWARDLY POSIONABLE AWAY FROM SAID DEPRESSIONS IN ANOTHER POSITION OF DRUM ROTATION, SAID RADIALLY OUTWARDLY POSITION PROVIDING A ROTATIONAL ASSIST FOR SAID INDEPENDENT DRIVE MEANS IN ROTATING SAID DRUM, FLUID MOTOR MEANS FOR ACTUATING EACH OF SAID CLAMPING MEANS, A HIGH PRESSURE FLUID SOURCE CONNECTABLE WITH SAID FLUID MOTOR MEANS, A VACUUM SOURCE CONNECTABLE WITH SAID DIFFERENTIAL PRESSURE CREATING MEANS, AND A NEGATIVE AND POSITIVE PRESSURE CONTROL VALVE ACTUATED BY DRUM ROTATION AND CONTROLLIONG OPERATIVE CONNECTION BETWEEN SAID DIFFERENTIAL PRESSURE CREATING MEANS AND SAID VACUUM SOURCE AND SAID FLUID MOTOR MEANS AND SAID HIGH PRESSURE SOURCE.