Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1991-09-23
1993-03-09
Culver, Horace M.
Package making
Progressively seamed cover web or web folds
With closing of web between package units
533745, 533746, 156358, B65B 5130, B65B 908
Patent
active
051917505
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an apparatus for the forming, filling and closing of bags made from a heat-sealable sheet utilizing means to form a tube from the sheet, a fill pipe and a cross-sealing station, which includes at least two cyclically movable cross-sealing jaws arranged on opposite sides of the tube.
BACKGROUND OF THE INVENTION
Many types of such tubular bag machines are known from the state of the art. The basic principle is thereby that a foil strip is guided over a shaping shoulder so that the edges of the foil strip overlap and can be welded to form a tube by means of a longitudinal welding device. The forming shoulder is connected to a fill pipe so that the goods to be packaged can be filled, mostly from above, through the fill pipe into the tube. In order to seal and to close the individual tubular bags, a cross-sealing station exists below the fill pipe, which is equipped with cross-welding jaws transversely movable with respect to the direction of movement of the tubular bag. The cross-welding jaws are moved in cyclical intervals against one another in order to produce in this manner the respective lower and also upper cross weldings of the bag. The cross-welding jaws must be moved since otherwise the respective next bag could not be moved on.
To move the cross-welding jaws, various principle solutions have been developed. One solution is to move the two cross-welding jaws laterally back and forth, namely to shift them translatorically. This solution is disadvantageous because a reversal of the direction of the cross-welding jaws is needed and thus the cycle frequency is limited.
A technically different solution is to support the cross-welding jaws each on a rotatable support, as this has been realized in the apparatus described in DE-PS 22 24 701. A similar solution is also shown in DE-PS 31 41 431. The disadvantage in these rotating sealing jaws is that these can contact one another only for a very short period of time so that the available sealing time is very short. This has the result that these apparatus can be used only in a limited field and do not permit an increase in the production speed.
In order to handle the problem of the relatively short sealing time with the rotatably supported cross-sealing jaws, it has been suggested to guide the jaws in a curved sector, which extends at least partly parallel with respect to the direction of movement of the tubular bag. Such a D-shaped curve is known from DE-PS 22 24 407. It is possible thereby to somewhat increase the sealing time, however, the guiding of the cross-sealing jaws in the D-shaped curve causes considerable accelerations and delays of the cross-welding jaw during one rotation so that relatively high mechanical stresses result. The result in turn is that the production speed cannot be increased as desired and that a relatively high degree of technology is required.
A further, additional disadvantage of the known solutions using rotating cross-sealing jaws is that the cross-sealing station, in particular in the direction of movement of the bag, has relatively large dimensions so that it is not possible with common machine sizes to provide additional apparatus, for example a device for the manufacture of a so-called block base, which permits the tubular bag to be stored in an upright position.
The basic purpose of the invention is to provide an apparatus of the above-mentioned type, which with a simple design and safe operation enables an extension of the sealing time with an increase in the production speed, has small dimensions and the possibility of easily arranging additional apparatus for special bags or special welding procedures.
This purpose is attained according to the invention by the cross-welding jaw being supported on a support which is connected to two parallel guide-bar arrangements, which are pivotal about two parallel axles arranged perpendicularly with respect to the centerline of the tube to define a four-bar mechanism.
The apparatus of the invention is distinguished by a number of si
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Culver Horace M.
Rovema Verpackungsmaschinen GmbH
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