DE2431319A1 - PACKAGING MACHINE FOR SHRINK FILM COVERING OF PIECE GOODS - Google Patents

Description

June 27, 1974 HS / E

Applicant: Karl Leibfried GmbH, 7033 Herrenberg, Schwarzwaldstrasse 63

Representative: Patent Attorneys Dr.-Ing. Rudolf Schiering and Dipl.-Ing. Hans Schiering, 703 Böblingen, Westerwaldweg 4

Packaging machine for shrink film wrapping

of general cargo

The invention relates to a packaging machine for shrink film wrapping of piece goods with a transport device for guiding the piece goods through, a roll-off device arranged above the transport path of the piece goods for one upper film supply roll, one lower the transport path of the piece goods arranged unwinding device for a lower film supply roll and with a welding device for connecting the upper and lower web to a roller conveyor that crosses the transport route of the piece goods, the behind an object pushed into the foil web by means of the transport device together with a renewed cross weld a separation of the I-foil of the enveloped object allows.

Such a packaging machine is already known from German Offenlegungsschrift 1,929,690. She ends

509883/0549

mostly with a shrink tunnel in which by the action of heat In addition to shrinking in the film material, a side closure of the shrink film banderole is also carried out can be so that all work processes are summarized on a particularly short distance. She is suitable This is particularly useful both for the effect that several objects are held together for shipping also for weatherproof full wrapping of large objects such as B. furniture, doors, mattresses and insulation boards. In order to have a to bring about a perfect side closure by utilizing the shrinkage stress that occurs in the shrink tunnel, it is preferably ensured that the lower film has only relatively narrow lateral protrusions and the lateral overhangs of the upper film extend almost down to the spread out lower film. With a frequent Changes in the dimensions of the packaged goods are therefore independent of the prevention of unnecessary waste Foil material the need, the shrink film supply rolls in the two unwinding devices more often to be exchanged for a shrink film supply roll of a different width.

The German Offenlegungsschrift 1 931 4-30 is a Quick change device for exchanging shrink film supply rolls in a machine for shrink film wrapping known from general cargo, in which for each of the two shrink films between the bearing for the supply roll and an additional feed device leading to the transverse sealing device for the shrink film wrapping Cross welding device for connecting a new supply roll and apart from the storage for the first supply roll an additional storage for the new supply roll is attached, which preferably consists of several in two par-

- 3 -509883/0549

allelic rows arranged one behind the other and transversely to the Machine longitudinally rotatable insertion rollers consists. This makes it possible to insert the new supply roll into the packaging machine while it is in operation and pulling the beginning of the new supply roll with the end of the old supply roll through the feed device, so that major downtimes of the packaging machine can be avoided.

The invention is based on the object of a packaging machine To create of the type mentioned above, the particularly fast replacement of the shrink film supply rolls allows for more frequent adjustment of the shrink film width to widely differing dimensions of the packaged goods

This object is achieved according to the invention in such a way that the unwinding device for the upper film supply roll and the unwinding device for the lower film supply roll one with an existing connection between the upper film and Form the lower film from the packaging machine that can be pulled out laterally.

On two or more exchange units of this type, upper and lower film combinations which differ from one another in terms of the film width can be used be kept ready for different packaged goods dimensions, so that in a Change of the packaged goods, a separation of the film web, a threading of the shrink film ends into the mostly countless ones Deflection rollers existing feed devices, a separate welding process for restoring the the transport path of the piece goods crossing the film web and a resulting loss of shrink film unnecessary. Apart from the complex of the exchange unit, it is often possible to purchase a second packaging machine

509883/0549

for shrink film wrapping of piece goods can be dispensed with, which at the same time saves a considerable amount of space brings.

An exemplary embodiment of the invention which is particularly preferred due to advantageous configurations is shown in FIG Drawing shown and is described in more detail below. Show it

Fig. 1 is a perspective reproduction of a packaging machine according to the prior art and

Fig. 2 is a plan view of the modified packaging machine according to the invention.

The packaging machine 1 shown in the drawing ends in both cases with a shrink tunnel 2 in that by the action of heat apart from the shrinking of the film material also a side closure of the shrink wrap can be made, so that all work processes are summarized in a particularly short distance. As the main part of the transport facility for guiding through packaging items 3 are in the area of the shrink tunnel 2 to an endless conveyor united transport rods 4- and outside this area at least two successive conveyor belts 5 and 6 intended. In the gap 7 formed between the conveyor belts 5 and 6, the upper film crosses through the connection 8 and 9 bottom film. 10 the transport route 11 of each packaging item 3 · For connecting of upper film 8 and lower film 9, two welding jaws 12 and 13 are provided in the effort of the gap 7, each be brought together for a short time after the usual packaging item 3 has migrated between them.

- 5 -509883/0549

The unwinding device 14 arranged over the transport path 11 for the upper film supply roll 15 and the lower the transport path 11 arranged unwinding device 16 for the lower film supply roll 17 preferably each include two parallel bearing rollers 18 on which the supply roller 15 or 17 only needs to be placed. To form buffer loops is in each of the two Unwinding devices 14 and 16 require a feed device. However, these feed devices are in the For the sake of clarity, the drawing is not included

The solution shown in Figure 2 of the drawing, in which two to the opposite sides of the packaging machine 1 alternately removable exchange units 19 and 20 of the type already described are provided, has the very special advantage that only one shifting movement is required to index the upper film / lower film combination in one of the two directions indicated by the double arrow 21 is required, which is another saves a considerable amount of time. To facilitate the sliding movement, the two have exchange units 19 and 20 a common one extending at right angles to the direction of passage 11 of the piece goods 3 Guide rail 22. In order to gain additional space and to move the exchange units 19 and 20 to cope with a single drive, the exchange units 19 and 20 are rigidly connected to each other. In addition, the exchange units 19 and 20 have a common chassis 23, so that a smooth Displaceability is achieved with a particularly low structural effort.

S09883 / 0549

It is easily possible to add further exchange units to the side of the exchange units 19 and 20. Another space saving, another time gain and to achieve a reduction in the production costs of the packaging machine 1 are the exchange units 19, 20 etc. graduated from one another in size with regard to the largest possible foil width. As a result of that the welding device 12, 13 for connecting the upper film 8 and lower film 9 is a component of the laterally movable Is an exchange unit, the upper web / lower web combination can also be used outside the working area of the Packaging machine 1 can be changed in each exchange unit. The measure that in addition the welding equipment 12, 13, the exchange units 19, 20, etc. against each other in the opening width for the piece goods 3 to be let through are graded, has the main purpose of the operating speed of the packaging machine 1 by Time savings when closing and opening the welding jaws 12 and 13 to increase even further.

In the preferred embodiment of the packaging machine 1 was also a convenient usability along with A further reduction in the structural effort is aimed at. For this reason, the exchange units have 19, 20, etc. a common control device 24 for exchanging the exchange unit and for operating the Transport device alternating with the welding device 12, 13 of the one driven into the packaging machine 1 Exchange unit. It is preferably arranged laterally next to the smallest exchange unit. For the easier and better support of the upper film supply rolls 15 and the associated unwinding devices 14 comprises the Transport device for guiding the piece goods 3 through three successive conveyor belts 5> 25 and 6, from

- 7 -B09883 / 0549

which the middle conveyor belt 25 is an additional component The exchange unit that can be pulled out from the side is · This embodiment of the packaging machine 1 is especially advantageous if there are more than two exchange units are joined laterally.

With the modified packaging machine 1 described, several packaging lines for shrink film wrapping can easily be set up of general cargo in one packaging line, as they differ from one another in terms of dimensions Items 3 this packaging machine 1 in colored screens with relatively close mutual Intervals can go through after the period of time for the change of the upper film-lower film combination on one is reduced to the extreme minimum. A final one to be mentioned, in particular with regard to a reduced Personnel expenses advantageous embodiment of the packaging machine 1 is that the exchange units 19, 20, etc. with the aid of a dimension scanner built into the piece goods inlet of the packaging machine 1 26 can be selected automatically. In such a dimensional scanner light barriers or mechanical sensors that can be swiveled against spring force can be used

11 claims

1 sheet of drawing

- 8 B09883 / 0549

Claims (11)

Claims 1. Wrapping machine for shrink film wrapping of piece goods with a transport device for passing the piece goods, one over the transport route of the piece goods arranged unwinding device for an upper film supply roll, one below the (Transport path of the piece goods arranged unwinding device for a lower film supply roll and with a welding device for connecting the upper film and the lower film to form a transport path for the piece goods intersecting film web, which is behind one by means of the transport device in the film web inserted object together with a new one Cross welding enables separation of the object wrapped in the film web, characterized in that the unwinding device (14) for the upper film supply roll (15) and the Unwinding device (16) for the lower film supply roll (17) with an existing connection between Upper film (8) and lower film (9) from the packaging machine (1) laterally removable exchange unit (19) form. 2. Packaging machine according to claim 1, characterized in that at least two after the opposite Sides of the packaging machine (1) alternately removable exchange units (19, 20) are provided 509883/0549 3. Packaging machine according to claim 2, characterized in that the exchange units (19, 20) a common guide rail extending at right angles to the direction of passage (11) of the piece goods (3) (22) "own. 4. Packaging machine according to claim 3 »characterized in that that the exchange units (19 »20) are rigidly connected to one another. 5. Packaging machine according to claim 4, characterized in that that the exchange units (19, 20) a have a common chassis (23). 6. Packaging machine according to one of claims 1 to 5, characterized in that the exchange units (19, 20) in size with respect to the largest possible foil width are graded against each other. 7 packaging machine according to one of claims 1 to 6, characterized in that the welding device (12, 13) for connecting the upper film (8) and the lower film (9) is part of the laterally removable exchange unit (19). 8. Packaging machine according to claim 7, characterized in that that the welding devices (12, 13) of the exchange units (19, 20) in the opening width for the piece goods (3) to be let through are graduated from one another. - 10 - 50988 3/0549 - ίο - 9 · Packaging machine according to claim 7 or 8, characterized characterized in that the exchange units (191-20) share a common control device (24-) for replacing the exchange unit and for actuating the transport device (5, 25, 6) in the Change with the welding device (12, 15) of the one driven into the packaging machine (1) Have an exchange unit. 10. Packaging machine according to one of claims 1 to 9, characterized in that the transport device for introducing the piece goods (3) three comprises successive conveyor belts (5, 25, 6), of which the middle conveyor belt (25) is an additional part of the laterally extendable Exchange unit (19) is. 11. Packaging machine according to one of claims 1 to 10, characterized in that the exchange units (19, 20) with the aid of a dimension scanner (26) built into the piece goods inlet of the packaging machine (1) are automatically selectable. 509883/0549