CS238092B1 - Device for closing and moving flat bags - Google Patents

Abstract

The continuous movement of the chain of filled, closed and finally separated flat bags is ensured by the sequential arrangement of two pairs of discs and two pairs of working jaws. The discs for longitudinal closing are unpowered and the discs for longitudinal guidance and both pairs of working jaws are powered.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for sealing and displacing flat bags of packaging film.

Until now, the sealing of the packaging foil pouches, heat sealable and pulse sealable, is mainly carried out by one pair of welding jaws. These jaws perform a vertical rectilinear reciprocating motion and the gripping, closing and opening of the jaws. However, the relative movement to the forming bag strand is an intermittent duty cycle with considerable unproductive delays between closing and displacement of the wrapping film.

It is also known to close the bags by arranging the rotary jaws of a cylindrical shape, where the rolling roll moves, and thus the intermittent displacement of the wrapping foils between the jaws. It is totally limited in terms of packaged products, it can only be used for lightweight product types, with a minimum filling volume, as these jaws have a higher drop height of the products. Also, any dimensional difference of the bags necessitates the replacement of the bulk of the closure device. This is costly and operationally disadvantageous from the point of view of the wider use of the device in operating conditions.

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The above-mentioned drawbacks are eliminated by the device for closing and displacing flat bags from the packaging, heat-sealable and pulse-sealable film according to the invention

SUMMARY OF THE INVENTION The continuous displacement of a chain of filled, closed and then separated flat bags is ensured by the successive arrangement of two pairs of discs and two pairs of working jaws. Below this space is located first one pair of working jaws, below them the longitudinal guide discs and then the second pair of working jaws · Both the pairs of working jaws and the longitudinal guide discs have a drive which is controlled according to a predetermined time diagram ·

The device according to the invention achieves a smooth closing and displacement of the flat bags from the heat-sealable and pulse-sealable foil with only a minimal time delay. The device can be used for a wide range of packaged products, such as lump, heavy, light, liquid and pasty. Due to the dimensional differences of the bags it is not necessary to replace the parts, especially for the lateral closing of the bags. It is possible to use non-traditional packaging materials, especially on the basis of polyolefins, by changing the working jaws with the function of entrainment and transverse closing of the longitudinal closing discs.

In the accompanying drawings, FIG. 1 shows a process for shaping, filling, closing and shifting a chain of flat bags in four working positions A, B, C, D. FIG. 2 is a side view of the arrangement of said principle in several chains;

The wrapping foil strip 5 is fed into the space of the wrapping machine via guide rollers 3a, 3, b. Longitudinal locking discs 4a,

4b connects the two sheets of packaging foil 5 at the edges, thus creating a space for filling with a product whose volume is given by the size of the bags 7. Below this space, the working jaws 1a, 1b are first placed. which simultaneously close and carry the bags of the bags 7, not yet transversely separated. At the same time, they also perform a straight return po3

238 092 movement in the displacement direction in which they are clamped and opened according to a predetermined duty cycle time diagram. The clamping and opening of the working jaws 1a, 1b can be ensured by any drive mechanism. Further, there are discs for the longitudinal guides 6a, 6b, which ensure a straight line of the hose from the discs 4a, 4b. Their width is infinitely adjustable during operation.

The working jaws 2a, 2b at the moment when the jaws are opened, lb carry and separate the flat bags 7 by an independent rectilinear reciprocating movement. This ensures a continuous chain shifting. * Both pairs of jaws are rolling along the guide rods and move as indicated position A - D in FIG. 1. The movement of each pair of jaws represents half the length of the bag being formed. By placing the disks 4a, 4b in the overall configuration, the lowest possible drop height H of the product is achieved.

The flat bag closing and dispensing device of the present invention can be used in the packaging of a wide variety of food, chemical, cosmetic and other products.

Claims (1)

SUBJECT OF THE INVENTION Apparatus for closing and displacing flat bags of heat-sealable and pulse-sealable foil, which is located in the space of a packaging machine for forming, filling and closing, characterized in that a volume is given below the disks (4a, 4b). below the space, there are placed first the working jaws (1a, 1b), then the discs (6a, 6b) and thereafter the working jaws (2a, 2b), the working jaws (1a, 1b), the discs (6a, 6b) ) and the working jaws (2a, 2b) are provided with a drive controlled by a predetermined timing diagram.