Machines for sealing wrappers of polyolefin sheet material around packages

Claim 1

A WRAPPER SEALING MACHINE FOR SEALING THE OVERLAPPED END FOLDS OF POLYOLEFIN WRAPPERS ON PACKAGES OF DIFFERENT SIZES COMPRISING, A FLAT WAY ADAPTED TO RECEIVE AND SUPPORT THE WRAPPED PACKAGES WITH THEIR ENDS AT THE SIDES OF THE WAY, LATERALLY ADJUSTABLE SIDE WALLS EXTENDING ALONG AND PROJECTING ABOVE THE SIDE OF SAID WAY TO RETAIN SAID END FOLDS AGAINST THE PACKAGES, HORIZONTALLY STRAIGHT AND CONTINUOUSLY FLAT HEATED PLATES ON THE OPPOSED INNER SIDES OF SAID SIDE WALLS, HORIZONTALLY STRAIGHT AND CONTINUOUSLY FLAT COOLED PLATES ON OPPOSED INNER SIDES OF SAID SIDE WALL AND CLOSELY ADJACENT AND AHEAD OF SAID HEATED PLATES, CARRIER MEANS CONSISTING OF HORIZONTAL CHAIN LOOPS POSITIONED WITH THEIR INNER REACHES EXTENDING ALONG SAID SIDE WALLS AND SUPPORTED FOR LATERAL ADJUSTMENT THEREWITH, BUFFER MEANS CONSISTING OF SHEETS OF FLEXIBLE MATERIAL INERT TO THE TEMPERATURE OF SAID HEAT PLATES CONNECTED TO SAID CARRIER MEANS AT REGULAR INTERVALS ALONG THE CARRIER MEANS, A PACKAGE ADVANCING CONVEYOR POSITIONED OVER SAID WAY AND HAVING DEPENDING FLIGHTS MOVABLE OVER AND ALONG THE MID-SECTION OF SAID WAY, SAID FLIGHTS PROJECTING SUBSTANTIALLY LATERALLY AND VERTICALLY RELATIVE TO SAID WAY TO ENGAGE SUBSTANTIAL AREAS OF THE BACK SIDES OF SAID PACKAGES IN LATERALLY AND VERTICALLY SPACED AND BALANCED RELATION IN PLANES PERPENDICULAR TO SAID SIDE WALLS, AND MEANS CONNECTED TO DRIVE SAID CONVEYOR AND SAID CARRIER MEANS TO ADVANCE SAID FLIGHTS IN EQUALLY TIMED RELATION TO THE SHEETS OF SAID BUFFER MEANS WHEREBY THE BUFFER MEANS ADVANCE ALONG THE INNER SIDES OF SAID PLATES WITH SAID FLIGHTS.