Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1998-03-17
1999-07-06
Sipos, John
Package making
Progressively seamed cover web or web folds
With closing of web between package units
531384, 53577, B65B 5100, B65B 5105
Patent
active
059184477
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for making portion packs of a dividable filling in a flexible tubular container by crimping the filled tube and placing at least one seal on the pinched area formed by axially crimping the filling, comprising crimping elements, which in an overlapping manner and symmetrical to the tube axis can be pivoted against each other and together define an aperture of variable size.
Such positioning devices are widely known in connection with sealing devices, in particular for making individual sausages from a sausage strand, for instance from the German patents DE 10 27 548, DE 15 86 210, DE 25 50 042 and DE 36 10 010. Such devices are regularly arranged in working direction behind a filing machine, which by means of a filling pipe presses the filling into the tubular container withdrawn from the outside of said pipe. For portioning purposes, the filling operation is stopped and the portioning and sealing devices are set in operation. Upon completion of their working cycles, the filling operation is continued until portioning and sealing must again be performed.
Apart from crimping elements linearly movable in opposite directions, as they are known for instance from the DE-OS 36 10 010, crimping devices with pivoted crimping elements are also available. The DE-OC19 86 210, for instance, discloses crimping elements comprising pivoted shear portions, whose crimping segments are moved towards the filled tube on circular arcs. The latter is likewise true for the crimping elements known from the DE-OS25 50 042, whose shear arms overlap each other at their tips also in the fully opened condition.
What all known crimping systems have in common is the disadvantage that for various reasons they require very stable constructions and the considerable masses, which must each be accelerated and decelerated, accordingly prevent high cycle rates. It was also found that with higher cycle rates the tubular container may be damaged as a result of the friction of the material of the tube on the crimping plates.
The object of providing a crimping system that can also be used for high cycle rates is solved by the invention in that the crimping elements consist of at least four strips, which with their one ends are stationarily pivoted with equal spacings on a circle concentric with the tube axis, while their other end regions are guided on a ring that is also concentric with the tube axis and to a limited extent can be rotated about the same, so that they extend like chords in the partial circle of their pivots and can perform both pivoting and longitudinal movements in their main plane in relation to the ring. When the ring is rotated (pivoted) from its normal position, in which the strips define an aperture allowing the filled tube to pass through unimpededly, about the tube axis, the strips are at the same time pivoted about their pivots, move towards each other and uniformly reduce the size of the aperture formed between them, without changing the geometrical shape of the aperture; in the case of four strips this is a square. Such pivoting may be continued until the strips have approached each other to a maximum--in the case of four strips the parallel extension of pairs of strips is maintained.
From the U.S. Pat. No. 4,593,516 a device for sealing bags is known per se, which has crimping elements overlapping each other and pivoted against each other symmetrical to the bag axis, which crimping elements together define an aperture of variable size, and where the crimping elements consist of four strips which with their one ends are stationarily pivoted with equal spacings on a circle concentric with the bag axis. At the ends of the pivots, these strips are firmly connected with chain wheels, one of which can be pivoted by means of a lever of a pneumatic cylinder piston and transmits this movement via a chain to the other chain wheels; due to the pivoting movement of the chain wheels the stripe also perform a pivoting movement. The sealing force is thus transmitted exclusively by means of torsion at
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Hanten Jurgen
Vermehren Gunter
Poly-Clip System GmbH & Co. KG
Sipos John
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