Importance

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Abstract

An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a vertically displaceable upper welding element which has an upper upstream welding tool extending across the strip and an upper downstream welding tool generally parallel thereto, and a blade fitted in the tool element to project downward from the upper tools. Respective heatable and vertically displaceable lower upstream and downstream welding tools are vertically aligned with the upper upstream and downstream tools and a bottom-seaming blade is displaceable between the lower tools between a position beneath same to a position projecting above same and operates for double seaming by positioning a stacker pin and the bottom blade below the lower tools and heating the respective tools which are displaced from the outer to the inner positions with the workpiece between them to pinch and weld the workpiece together along upstream and downstream seams at the respective tools and to cut the workpiece across with the upper blade between the seams, and for bottom seaming by removing the blade and raising the pin and bottom blade above the lower tools, which are displaced from the outer to the inner positions with the workpiece between them to simultaneously cut the workpiece through and form two confronting end seams with the bottom blade while pinching it on both sides of the blade and spindling it downstream of the blade on the pin.

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First Claim