Wrapper sealing machine for limp polyolefin film wrappers

Claim 1

IN A WRAPPING MACHINE HAVING MEANS FOR ADVANCING A PACKAGE TO BE WRAPPED WITH A SHEET OF LIMP POLYOLEFIN MATERIAL DRAPED OVER THE FRONT, TOP AND BACK OF THE PACKAGE, AND FURTHER HAVING MEANS OVERLAPPING THE BOTTOM EDGES OF THE SHEET ON THE BOTTOM OF THE PACKAGE, END FLAP FOLDING MEANS INCLUDING SHIFTABLE END FOLDING PLATES ARRANGED TO SELECTIVELY FOLD THE END EDGES OF THE SHEET INTO UPWARDLY FOLDED END FOLDS ALONG THE ENDS OF RELATIVELY HIGH PACKAGES AND ALTERNATIVELY INTO DOWNWARDLY AND INWARDLY FOLDED BOTTOM FOLDS LAPPED ON THE ENDS OF THE BOTTOM OF RELATIVELY THIN PACKAGES, BOTTOM SUPPORT RAILS ARRANGED TO RECEIVE AND SUPPORT THE BOTTOM OF PACKAGES FROM SAID FOLDING MEANS, LATERALLY SPACED AND ADJUSTABLE UPRIGHT END SUPPORT PLATES ARRANGED TO RECEIVE AND SUPPORT THE ENDS OF A PACKAGE FROM SAID FOLDING MEANS, HEATED FLAT END SEALING PLATES INTERPOSED IN SAID END SUPPORT PLATES, REFRIGERATED FLAT END COOLING PLATES INTERPOSED IN SAID END SUPPORT PLATES AHEAD OF SAID SEALING PLATES, HEATED BOTTOM SEALING PLATES INTERPOSED IN SAID BOTTOM SUPPORT RAILS ALONGSIDE SAID END SEALING PLATES, REFRIGERATED FLAT BOTTOM COOLING PLATES INTERPOSED IN SAID BOTTOM SUPPORT RAILS AHEAD OF SAID HEATED BOTTOM SEALING PLATES, CONTROL MEANS CONNECTED TO SELECTIVELY ACTUATE SAID END SEALING PLATES AND END COOLING PLATES AND ALTERNATIVELY SAID BOTTOM SEALING PLATES AND BOTTOM COOLING PLATES, CARRIER CONVEYOR LOOPS POSITIONED ABOVE AND BELOW SAID END SUPPORT PLATES, BUFFER SHEETS OF HEAT RESISTANT NON-STICKING FIBERGLAS MATERIAL HAVING THEIR LEADING EDGES CONNECTED BETWEEN SAID CONVEYOR LOOPS TO BE ADVANCED THEREBY ALONG THE INNER SIDES OF SAID END SEALING AND END COOLING PLATES, UPRIGHT BELT LOOPS OF HEAT RESISTANT NON-STICKING FIBERGLAS MATERIAL HAVING THEIR UPPER REACHES TRAINED IN LAPPED SUPPORTED ENGAGEMENT WITH SAID BOTTOM SEALING AND BOTTOM COOLING PLATES, A PACKAGE ADVANCING CONVEYOR HAVING A FRAME POSITIONED OVER SAID END SUPPORT PLATES AND HAVING PACKAGE ADVANCING FLIGHTS TRANSLATABLE BETWEEN SAID END SUPPORT PLATES DOWN TO APPROXIMATELY THE LEVEL OF SAID BOTTOM SUPPORT RAILS, HOLD DOWN RAILS VERTICALLY ADJUSTABLY MOUNTED ON THE FRAME OF SAID PACKAGE ADVANCING CONVEYOR AND ADJUSTABLE BETWEEN CLOSELY AND WIDELY SPACED RELATION TO SAID BOTTOM SUPPORT RAILS, AND DRIVE MEANS CONNECTED TO ADVANCE SAID FLIGHTS OF SAID PACKAGE ADVANCING CONVEYOR AND THE LATERALLY INNER REACHES OF SAID CARRIER CONVEYOR LOOPS AND THE UPPER REACHES OF SAID BELT LOOPS AT THE SAME SPEED AND IN SYNCHRONISM WITH SAID PACKAGE ADVANCING MEANS.