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US 4,481,006 AGranted
Bag making method and machine
AssigneeCustom Packaging Systems, Inc.
InventorsArthur E. LaFleur, Lee LaFleur
Life of this patent
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AssigneeCustom Packaging Systems, Inc.
InventorsArthur E. LaFleur, Lee LaFleur
Estimating the term…
A length of woven plastic fabric in tubular form is advanced from a source of supply while telescoped over a separator plate which maintains the two plies of the tubular stock in separated relation. A heated knife blade aligned vertically with the downstream end of the separator plate is reciprocated vertically to sever the tube stock into bag blanks. The severed edges on the upstream side of the heated knife remain separated rather than being heat sealed together by the heated blade. The severed blank is impaled on needles mounted on an endless chain which conveys the blanks laterally through a sewing machine and/or a sealing mechanism for securely closing one end of the blanks. Thereafter successive blanks are conveyed to a stacking device which disengages the blanks from the needle chain and stacks them horizontally one upon another.
The method of making bags from flat tubular woven plastic web stock adapted to be fused by heating and which is advanced longitudinally in one direction on a support, said method including the step of severing the stock transversely by means of a heated element extending transversely of the stock at a fixed location on the support, said heated element being reciprocable in a direction perpendicular to the plane of the stock to sever the trailing end of one bag from the leading end of the next successive bag as the stock is intermittently advanced, said severing step comprising arranging a separator plate having a width corresponding to the width of the flat tubular stock on said support so that the leading end of the plate is at all times located directly adjacent and generally parallel to the line of severing produced by the heated element, telescoping the leading end of the tubular stock over the trailing end of the plate so that the two plies of the tubular stock are spaced apart a distance corresponding to at least the thickness of the plate, intermittently advancing the stock in a downstream direction to a position wherein the desired line of severing between the two bags is aligned directly adjacent the leading end of the separator plate and then reciprocating the heated element past the separator plate and through the two plies to sever the spaced apart plies of the stock directly adjacent the leading end of the separator plate and thereby retain the plies at the leading end of said next bag in said separated condition.
In a machine for making bags from a continuous length of flat tubular web stock the combination comprising, means for advancing the tubular stock longitudinally in a generally horizontal path, a cutter intermittently operable to cut the stock transversely into successive bag blanks of predetermined length, a flexible element arranged to travel in an endless path, at least a portion of which is adjacent and downstream of the line of cut of said cutter relative to the longitudinal path of travel of the tubular stock, a plurality of vertically disposed needles on said flexible element, the needles on said portion of the flexible element being oriented so that they point vertically upwardly and means for moving said portion of the flexible element and the adjacent transversely extending portion of the tubular stock vertically relative to each other for causing said portion of the tubular stock to be impaled on said needles.
In a machine for making plastic bags from a continuous length of flat tubular woven plastic web stock, the combination comprising, a support, means for intermittently advancing the tubular stock longitudinally in a predetermined path on said support, a heated element extending transversely of the path of travel of the tubular stock at a fixed location on said support, means for reciprocating the heated element transversely of the plane of the stock to engage and sever the stock to bag blanks of predetermined length, a generally flat separator plate arranged within the tubular stock such that one ply of the tubular stock overlies one face of the separator plate and the other ply of the tubular stock overlies the other face of the separator plate and means for supporting the separator plate such that the leading end thereof extends at all times along a line closely adjacent the line of severing produced by the heated element whereby, when the heated element is reciprocated, the stock is severed and the severed edges of the two plies at the upstream side of said line of severing are maintained in separated, spaced-apart relation by said end of the separator plate.
Dependencies are inferred from the claim text.