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AssigneeRovema Verpackungsmaschinen GmbH
InventorsIng. R. Kammler, Reiner Ade, Walter Baur
Estimating the term…
A packaging machine for manufacturing filling and closing of bags. A foil tube (4) is pulled off continuously by means of unwinding belts (13) on a packaging machine contracted as a tubular bag-forming machine. Cross sealing seams are created by means of continuously moving cross sealing jaws. The cross sealing jaws are maintained in a horizontal position during their entire movement by being guided in guide grooves. The guide curves have straight curve pieces in the area of a sealing zone, which curve pieces extend parallel with respect to the unwinding direction of the foil tube (4). The packaging machine permits a high operating speed, since the cross sealing occurs simultaneously with the unwinding movement and the cross sealing jaws, are guided exactly in an optimum position with respect to the foil tube. (4). The machine can be operated such that the unwinding speed for the thin sheet material is only a little slower than the speed of the goods to be packaged at the end of the fill pipe.
In a packaging machine for manufacturing bags from a thin foil of a hot-sealable material and for filling and closing said bags, comprising a vertically extending mandrel means surrounded by a shoulder means for forming said thin foil into a tube having overlapping edges, a longitudinal sealing member for connecting said overlapping edges of said thin foil, and a sealing station arranged downstream of an output end of said mandrel means and having sealing jaws arranged in opposition to each other on two travelling jaw carriers which are synchronously movable about parallel axes in opposite senses of direction, each sealing jaw being supported by a jaw holder which is adapted to pivot about a pivot axis relative to an associated jaw carrier, the improvement wherein continuously moving conveyor means are provided for engaging said foil below said shoulder means with positive friction to facilitate an unwinding of said thin foil and movement over said mandrel means, wherein speed adjusting means are provided for governing the relationship between the peripheral speeds of said conveyor means and of said jaw carriers such that the speed of movement of said sealing jaws during continued contact with said foil tube will not exceed the peripheral speed of said conveyor means, wherein said jaw holders are radially movable in said jaw carriers, wherein each jaw holder has two guide elements, each of which is guided on a closed guideway of a symmetrical and concentric pair of guideways, said pair of symmetrical and concentric guideways having identical shapes, wherein said sealing jaws are oriented perpendicularly with respect to said foil tube at least in the area of a vertically extending sealing zone along which said sealing jaws move face to face downward with said thin foil tube pinched therebetween, and wherein a third guideway is provided which is concentric to one of said pair of symmetrical guideways, said symmetrical and concentric guideways being each oriented at opposite sides of said jaw holders.
In a method for operating a packaging machine for manufacturing bags from a thin foil of a hot-sealable material and for filling and closing said bags, comprising a vertically extending mandrel means surrounded by a shoulder means for forming said thin foil into a tube having overlapping edges, a longitudinal sealing member for connecting said overlapping edges of said thin foil, and a sealing station arranged downstream of an output end of said mandrel means and having sealing jaws arranged in opposition to each other on two travelling jaw carriers which are synchronously movable about parallel axes in opposite senses of direction, each sealing jaw being supported by a jaw holder which is adapted to pivot about a pivot axis relative to an associated jaw carrier, the improvement wherein a continuous movement of a conveyor means is implemented, said conveyor means engaging said foil below said shoulder means with positive friction to facilitate a continuous unwinding of said thin foil and movement over said mandrel means, and wherein a governing of a speed adjusting means is also implemented for controlling the relationship between the peripheral speeds of said conveyor means and of said jaw carriers so that the speed of movement of said sealing jaws during continued contact with said foil tube will not exceed the peripheral speed of said conveyor means and so that said thin foil is pulled off from said mandrel at a speed that is slightly slower than a speed of movement of the material to be packaged relative to a lower end of said mandrel means.
Dependencies are inferred from the claim text.