EP2377762B1 - Method and device for wrapping a stack of goods with a film - Google Patents

Description

The invention relates to a device for wrapping a stack of goods with a film having at least one film supply for the film, a Folienzuführkopf for feeding the film and a Überzieheinrichtung for coating the film over the stack, the Folienzuführkopf a Zuführkopfbasis and a relative to Zuführkopfbasis rotatable Manipulating device and wherein the rotatable manipulating device has a film storage for storing a film section for at least one coating operation. The invention further relates to a method for wrapping a stack of goods with a film. In the context of the invention, film means in particular a plastic film and preferably an elastic plastic film. - It is within the scope of the invention that the stack to be wrapped consists of stacked products. The stack may also be products from the white area, such. As refrigerators or the like. Conveniently, the stack to be wrapped is received on a pallet.

In practice, it is not uncommon that good stacks or pallets assigned to these stacks of goods with different orientations are successively fed to a device for wrapping the stacks of goods. Thus, it happens that, for example, first a stack, which is not square in plan view, or a pallet, which is not square in plan view, is fed and enveloped with the dimension L · B, and subsequently another one rotated by 90 ° with respect to the first stack of goods about a vertical axis Good pile with the dimensions B · L supplied and must be wrapped. In order to obtain in such a case, an optimally adapted to the Gutstapelabmessung or to the pallet dimension foil or film hood, additional measures are required here. From practice it is known among other things Raise the stack with the lifting system of a sub-shrinking device and rotate for the coating process by 90 °. However, this often leads to collapses of the pile of goods with product losses and plant downtime. It is also known in practice in the conveyor system To arrange a turntable below the Folienzuführkopf so that the stack can be rotated accordingly. But it comes in the transition areas between the turntable and the conveyor edge to constraints, since the pallets associated with the good stacks often get stuck at the transitions and the stacks then often collapse. Furthermore, it is known from practice to make the entire Folienzuführkopf rotatable by 90 °, so that the film can always be fed in the desired direction. This solution is relatively expensive and the way in the way too slow because in particular large masses must be moved. Furthermore, it is known from practice that the film is first completely assembled in the Folienzuführkopf and welded and then transferred to a roll and is rolled up by the roller. Then, this roller is rotated by 90 ° to the transport direction and the film is transferred from the roller to the Überzieheinrichtung. These measures known from practice are relatively expensive. The multiple transfers of the film cause a relatively high susceptibility to interference. Thus, the known measures or devices are in need of improvement.

A device of the type mentioned is incidentally off EP 1 060 988 A1 known. Working with this device is relatively complicated or time consuming.

In contrast, the invention, the technical problem of providing a device of the type mentioned above, with the differently oriented stack, in particular by 90 ° against each other rotated non-square stack successively in a simple, inexpensive, efficient and reliable manner can be wrapped. Furthermore, the invention is the technical problem of specifying a corresponding method for wrapping stacks of good.

To solve this technical problem, the invention teaches a device of the type mentioned, which is characterized in that the Zuführkopfbasis comprises at least one film drive device for feeding the film to the manipulator
and in that the manipulation device has a foil welding device with which one end of the foil section stored in the foil store can be welded.

It is within the scope of the invention that a rotation of the manipulation takes place when after wrapping a first stack of goods with a first orientation, a second stack is to be wrapped with a deviating from the orientation of the first stack of material second orientation and / or if stacked with different dimensions should be wrapped one after the other. The rotation of the manipulating device takes place in particular after the wrapping of a first non-square stack of goods having the dimensions L * B and before wrapping a second stack, not square in plan view, with the dimensions rotated by 90 ° relative to the first stack of goods In this case, L means, in particular, the length of the product stack and B, in particular, the width of the product stack. It is therefore within the scope of the invention that the successive to be wrapped stack of goods may have the same dimensions and are rotated only by 90 ° to each other. In principle, however, the stacks of goods to be wrapped one after the other can also have different dimensions.

It is also within the scope of the invention that in the film memory of the Manipuliereinrichtung a film section for a subsequent coating operation can be stored. The foil section stored in the film store should therefore expediently have a sufficient length for coating over a stack of goods. Coating of the film over a stack means, in the context of the invention, in particular also quite generally, the wrapping of a stack of goods with a film.

According to the invention, the feed head base of the film feed head has at least one film drive device for feeding or transporting the film. The feed head base expediently comprises guide rollers and / or deflection rollers for the film or for the film fed from the supply of film to the film feeding head. It is within the scope of the invention that the Zuführkopfbasis the Folienzuführkopfes is not rotatable or not rotatable relative to the manipulation device.

Conveniently, the manipulating device is rotatable by at least 90 ° or 90 ° relative to the Zuführkopfbasis. It is within the scope of the invention that the manipulating device is rotatable about an axis oriented in the over-pulling device of the film and preferably about a vertical axis. Covering device of the film means the direction in which the film is coated with the Überzieheinrichtung over the stack.

According to a particularly preferred embodiment of the invention, the manipulation device has a film separating device for separating the film section stored in the film store. It is within the scope of the invention that the film separating device is rotatable as part of the manipulating device together with the manipulating device relative to the feeding head base. The film separating device is expediently designed in the form of a film cutting device and in particular as a film knife.

According to a very preferred embodiment of the invention, the film is formed as a film tube or the film can be fed as a film tube. It is recommended that the film tube is designed as a gusseted tube. In this case, the film tube in addition to two superimposed film layers expediently on each side of a fold. A preferred embodiment of the invention is that a film tube or a gusseted tube is pulled as a film hood over the stack. It is recommended that this takes place in a conventional manner, a welding of the film tube.

According to the invention, the manipulation device has a foil welding device with which one end of the foil section stored in the foil store can be welded. It is within the scope of the invention that the foil welding device is rotatable relative to the feed head base as part of the manipulating device together with the manipulating device. It is furthermore within the scope of the invention that the end of the foil section stored in the foil store is welded with the proviso that a hood-shaped foil section or a foil hood is formed. Appropriately, the film welding device comprises two mutually movable welding bar.

Empfohlenermaßen, the manipulation device has an opening device for opening the foil section or foil tube section stored in the foil store. It is understood that the opening of the film section or film tube section takes place before coating over the stack. The opening device is rotatable as part of the manipulating device together with the manipulating device relative to the feeding head base. It is recommended that the opening device is designed as a suction opening device with a plurality of suction cheeks.

It is within the scope of the invention that the film storage device has at least one carrier element which can be moved transversely to the coating direction Ü of the film for transporting the film transversely to the coating direction Ü of the film. In this way, the film sub-sections entrained by the driving element are stored or temporarily stored in the film memory. The at least one carrier element is preferably a take-along roller.

A particularly preferred embodiment of the invention is characterized in that at least one carrier element in a first direction transversely to the coating direction Ü of the film is movable, so that two first opposite film sections of entrained by the driving element foil can be stored in the film memory, wherein the entrainment element is deflected and in a direction opposite to the direction of the second direction opposite second direction of the film is movable, so that further film sections of the entrained by the driving element foil in the film memory can be stored. The film sections or the deflected sections of the film also complement each other in the film storage stored foil section. Preferably, at least two or two driving elements are provided according to the very preferred embodiment of the invention described above.

According to a recommended embodiment of the invention, the film storage on at least one endless belt, wherein at least one carrier element for the film is fixed to the endless belt and wherein during a movement of the endless belt, the carrier element transports the film transverse to the coating direction Ü of the film. In this way, the storage of film sections or the film section already described above takes place. The endless belt may be a chain, a timing belt or the like. It is within the scope of the invention that the endless belt is guided over two deflection rollers or rollers, wherein at least one deflection roller or Deflection roller is driven and thus acts as a drive roller or drive roller for the endless belt.

A highly recommended embodiment is characterized in that at least one first entrainment element is arranged on the upper strand of the endless belt and at least one second entrainment element is attached on the lower strand of the endless belt and that during a movement of the endless belt the first entrainment element for entrainment of the film transversely to the coating direction Ü of the film to the right is movable and the second driving element for driving the film transversely to the coating direction Ü of the film is moved to the left. In this way, each of the two driving elements causes the storage of two opposite film sections. As already explained above, the carrier elements are preferably entrainment rollers. It is within the scope of the invention that the above-mentioned film subsections and the film sub-sections deflected on the entrainment elements complement each other to form the foil section stored in the film store. A particularly preferred embodiment of the invention is characterized in that the initially moving to the right entrainment element on the first guide roller of the endless belt over and preferably then transverse to the coating direction Ü of the film is moved to the left and that initially moved to the left driving element on the second guide roller the endless belt over and then preferably transversely to the coating direction Ü of the film is moved to the right. The first entrainment element previously arranged on the upper strand is then arranged on the lower strand of the endless belt and the second entrainment element previously arranged on the lower strand is then arranged on the upper strand of the endless belt. In this embodiment, two further opposite film partial sections are produced by each entrainment element. Thus, a relatively long film portion is stored in the film memory. In principle, the embodiments described above for the endless belt also work without an endless belt, if in these embodiments the driving elements be moved by other means or means known in the art in the manner described.

Preferably, at least one support roller, preferably a plurality of support rollers for the film is arranged on the upper strand of the endless belt and / or at least one support roller, preferably a plurality of support rollers for the film is arranged on the lower strand of the endless belt. It is within the scope of the invention that the support rollers are fixed to the endless belt and are moved with the endless belt. The support rollers fulfill the purpose that the foil sections do not overlap one another directly after the deflection process or after the deflection processes, since they would otherwise block one another or block the foil reservoir.

Empfohlenermaßen the Folienzuführkopf in Überziehrichtung Ü the film and opposite to the coating direction Ü of the film is movable. The Zuführkopfbasis and the manipulating device are then moved as components of the Folienzuführkopfes with Folienzuführkopf. Conveniently, the Folienzuführkopf is moved vertically. It is recommended that both the Folienzuführkopf and the overdrawing device on vertical masts, preferably on only two vertical masts are movable. Preferably, at least one film storage device is arranged between the film supply and the film feed head. The film storage device is used for receiving or storing film in the process of Folienzuführkopfes in Überziehrichtung Ü and for dispensing of film in the process of Folienzuführkopfes against the coating direction Ü.

To solve the technical problem, the invention further teaches a method for wrapping stacks of goods with film, wherein for wrapping a first stack of goods about a vertical axis, in particular one in the Top view of non-square product stack with the dimensions L · B, film is fed from a feed head base of a Folienzuführkopfes, wherein a film section is separated from the film and wherein this film section is pulled over the first stack of goods,
wherein for the subsequent wrapping of a second stack of goods with a different orientation from the first orientation, in particular one with respect to the first stack of goods about a vertical axis rotated by 90 ° in the plan view not square stack of goods with the dimensions B · L, foil from the Zuführkopfbasis first a film store is fed to a manipulation device of the film feed head, wherein a film section provided for at least one coating operation is stored in the film store, and wherein the film section is separated from the remaining film,
wherein then the manipulating device is rotated relative to the Zuführkopfbasis with the proviso that the film section can be covered over the second stack, wherein the film section is then released from the film storage and pulled over the second stack and wherein one end of the foil stored in the film storage section welded while the manipulator is being rotated. Appropriately, the manipulating device is rotated at 90 ° to each other rotated stacking by 90 °.

According to the invention, an end or the upper end of the film section stored in the film store is welded while the manipulating device is rotated. Conveniently, a cooling of the weld formed in this way takes place during the rotation of the manipulating device. It is recommended that the film section or film tube section is opened for the subsequent coating operation during or after the rotation of the manipulating device. It goes without saying that the manipulating device can be turned back again,
In particular, can be rotated back by 90 °, if in turn a rotated by 90 ° stack should be wrapped.

The invention is based on the finding that with the device according to the invention or that with the method according to the invention a simple, inexpensive and functionally reliable envelope of successively fed material stacks of different orientation is possible. It is particularly important to emphasize that a change from a wrapping of a first stack of goods to a wrapping of a second differently oriented stack of goods in a quick, inexpensive and reliable manner is possible. The device according to the invention is characterized by a relatively simple and less complex structure. It should also be emphasized that already existing devices can be retrofitted in a relatively simple and cost-effective manner with the components according to the invention. The device according to the invention is characterized, moreover, by an extremely low susceptibility to interference.

Fig. 1

eine perspektivische Ansicht einer erfindungsgemäßen Vorrichtung zum Umhüllen eines Gutstapels,

Fig. 2

eine perspektivische Ansicht des Folienzuführkopfes der erfindungsgemäßen Vorrichtung,

Fig.3

eine Seitenansicht des Folienzuführkopfes im Schnitt in einer ersten Funktionsstellung,

Fig. 4

den Gegenstand gemäß Fig. 3 in einer zweiten Funktionsstellung,

Fig. 5

den Gegenstand nach Fig. 3 in einer dritten Funktionsstellung und

Fig. 6

den Gegenstand gemäß Fig. 3 in einer vierten Funktionsstellung.

The invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. In a schematic representation:

Fig. 1

a perspective view of a device according to the invention for wrapping a stack of goods,

Fig. 2

a perspective view of the Folienzuführkopfes the device according to the invention,

Figure 3

a side view of the Folienzuführkopfes in section in a first functional position,

Fig. 4

the object according to Fig. 3 in a second functional position,

Fig. 5

the object after Fig. 3 in a third functional position and

Fig. 6

the object according to Fig. 3 in a fourth functional position.

The figures show a device for wrapping a stack 1 with a film 2. This device is equipped with a Folienzuführkopf 3 for feeding the film 2 and with a coating device 4 for subsequent coating of the film 2 on the stack 1. In the embodiment, the device has a Foil supply in the form of a film coil 5 on. The film 2 is fed from the film coil 5 to the Folienzuführkopf 3.

According to the invention, the Folienzuführkopf 3 a Zuführkopfbasis 6 and a relative to the Zuführkopfbasis 6 rotatable manipulating device 7. In the exemplary embodiment, the rotatable manipulating device 7 is arranged below the feed head base 6. The feed head base 6 comprises a film drive device 8 for feeding or transporting the film 2 to the manipulation device 7. Furthermore, the feed head base 6 has guide or deflection rollers 9 for the film 2. The film 2 is otherwise preferred and formed in the embodiment as a film tube and in particular as a gusseted tube.

The rotatable manipulating device 7 has a turntable 10 connected to the feeding head base 6 and a film store 11 arranged underneath the turntable 10. Furthermore, the manipulating device 7 is equipped with a film separating device in the form of a rolling knife 12, with which a film section 13 or film tube section of the film 2 can be separated. Furthermore, the manipulation device 7 has a foil welding device in the form of two welding bars 14. With this film welding device or with these welding bars 14, an upper end of the film section 13 can be welded with the proviso that a hood-shaped film section 13 or a film hood is formed. This hood-shaped film section 13 or this film hood is then pulled over the stack 1. For this purpose, the manipulation device 7 also has an opening device 15 for opening the film section 13 or the film tube section. Preferably, and in the exemplary embodiment, the opening device 15 comprises known suction cheeks 16 for opening the film tube.

The device according to the invention is used for wrapping non-square in cross-section or in the plan view of good stacks 1, which are usually arranged on likewise not in cross-section or in the plan view of square pallets 17. If first a non-square stack 1 or a non-square pallet 17 is enveloped with the dimensions L · B, then with the device according to the invention rotated by 90 ° stack 1 and a rotated by 90 ° pallet 17 with the dimensions B -. L are functionally reliable and can be wrapped without any problems. The two previously described successively supplied stack 1 and the associated pallets 17 may therefore basically have the same dimensions or sizes. They are rotated in the embodiment only by 90 ° to each other. Thus, the film 2 and the film tube can then be fed informally, the manipulating device 7 according to the invention with respect to the Zuführkopfbasis 6 of Folienzuführkopfes 3 is rotatable. Preferably, and in the exemplary embodiment, the manipulation device 7 is rotatable by 90 ° relative to the Zuführkopfbasis 6.

Subsequently, the operation of the device according to the invention, in particular based on Fig. 3 to 6 explained. First, the film 2 with the film drive device 8 of the Zuführkopfbasis 6 of the manipulator 7th fed to the foil knife 12, the welding bar 14 and the film memory 11 over into the opening device 15. Conveniently, the end of the film 2 is conveyed to the lower edge of the suction cheeks 16, not shown. Then those in the Fig. 3 closed suction cheeks 16 closed, so that the film 2 is held as it were between the suction cheeks 16.

Subsequently, the film storage 11 of the invention is set in motion. The film storage 11 preferably comprises and in the exemplary embodiment on two opposite side walls 18 arranged endless belts 19 and fixed to the endless belts 19 take-along rollers 20 for the film 2, which extend between the side walls 18 of the manipulating device 7. Furthermore, 19 support rollers 21 are fixed to the endless belts 19 for the film 2, which also extend between the side walls 18 of the manipulating device 7. The endless belts 19 are guided over two pulleys 22, of which at least one is driven. In the embodiment, the endless belts 19 are formed as chains and the guide rollers 22 as corresponding gears that mesh with the chains. In the Fig. 3 to 6 By the way, only one side wall 18 and only one endless belt 19 can be seen.

After closing the suction cheeks 16, the endless belts 19 are set in motion so that the take-up roll 20 arranged on the upper run of the endless belts 19 takes the film 2 to the right and the take-up roll 20 arranged on the lower run of the endless belts 19 takes the film 2 to the left ( Fig. 4 ). In this case, the film 2 is held in the lower region of the film storage 11 by a transverse to the coating direction Ü of the film 2 movable Follenführungsrolle 23, In the functional position of Fig. 4 Each entrainment role 20 are associated with two opposite film sections 24, which are stored in the film memory 11.

The entrainment rollers 20 are then expediently guided around the deflection rollers 22 of the endless belts 19, so that the entraining roller 20 previously arranged on the upper strand is now arranged on the lower strand and the entraining roller 20 previously arranged on the lower strand is now arranged on the upper strand ( Fig. 5 ). The entrainment rollers 20 are moved by appropriate movement of the endless belts 19 further entlag the upper strand or the lower center in the direction of the center of the film memory, so that in Fig. 6 shown functional position results in this way in the film memory 11 arranged or stored film subsections 24 complement each other to the stored film in the film 11 film section 13th

After the desired flared length ( Fig. 6 ) is reached, the film drive device 8 and the movement of the endless belts 19 is stopped. Subsequently, the welding bars 14 are closed for welding the film section 13 and the film section 13 is separated with the film knife 12 of the remaining film 2. Thereafter, the rotation of the manipulating device 7 or the rotation of the turntable 10 of the manipulating device 7 takes place. Conveniently, the manipulating device 7 is rotated by 90 °, while the welding process and the cooling of the weld produced.

The film section 13 is opened for the coating operation of the opening device 15 and of the suction cheeks 16 and now reversed movement of the endless belts 19 of the film storage 11 releases the Follenabschnitt 13 and the film section 13 can be pulled over the stack 1 with the overdrawing device 4. This is not shown in detail in the figures

Claims (13)

1. A device for wrapping a stack of goods (1) with a film (2), comprising at least one film storage for the film (2), a film feeding head (3) for feeding the film (2) and comprising a covering device (4) for covering the stack of goods (1) with the film (2),
   wherein the film feeding head (3) encompasses a feeding head base (6) as well as a manipulating device (7), which can be rotated relative to the feeding head base (6),
   wherein the rotatable manipulating device (7) encompasses a film storage (11) for storing a film portion (13) for at least one covering process,
   characterized in that the feeding head base (6) comprises at least one film driving device (8) for feeding the film (2) to the manipulating device (7),
   and in that the manipulating device (7) encompasses a film sealing device, by means of which one end of the film portion (13) stored in the film storage (11) can be sealed.
2. The device according to claim 1, characterized in that the manipulating device (7) can be rotated by at least 90° relative to the feeding head base (6).
3. The device according to one of claims 1 or 2, characterized in that the manipulating device (7) encompasses a film severing device for severing the film portion (13) stored in the film storage (11).
4. The device according to one of claims 1 to 3, characterized in that the manipulating device (7) encompasses an opening device (15) for opening the film portion (13) or the film tube portion, respectively, stored in the film storage (11).
5. The device according to one of claims 1 to 4, characterized in that the film storage (11) encompasses at least one entraining element for entraining the film (2) transversely to the covering direction (Ü) of the film.
6. The device according to one of claims 1 to 5, characterized in that at least one entraining element can be displaced in a first direction transversely to the covering direction (Ü) of the film (2), so that two partial film portions (24) of the film (2) entrained by the entraining element, which are located opposite one another, can be stored in the film storage (11), wherein the entraining element can be diverted and can be displaced in a second direction, which is opposite to the first direction, transversely to the covering direction (Ü) of the film (2), so that further partial film portions (24) of the film (2) entrained by the entraining element can be stored in the film storage (11).
7. The device according to one of claims 5 or 6, characterized in that the film storage (11) encompasses at least one endless belt (19), wherein at least one entraining element for the film (2) is fixed to the endless belt (19) and wherein the entraining element entrains the film (2) transversely to the covering direction (Ü) of the film (2) in response to a movement of the endless belt (19).
8. The device according to claim 7, characterized in that at least a first entraining element is arranged on the upper run of the endless belt (19) and at least a second entraining element is arranged on the lower run of the endless belt (19) and wherein the first entraining element can be moved to the right for entraining the film (2) transversely to the covering direction (Ü) of the film (2) in response to a movement of the endless belt (19) and the second entraining element can be moved to the left for entraining the film (2) transversely to the covering direction (Ü) of the film (2).
9. The device according to claim 8, characterized in that the entraining element moved to the right can be moved past a first deflection roller (22) of the endless belt (19) and then to the left preferably transversely to the covering direction (Ü) of the film (2), and wherein the entraining element moved to the left can be moved past a second deflection roller (22) of the endless belt (19) and then to the right preferably transversely to the covering direction (Ü) of the film (2).
10. The device according to one of claims 7 to 9, characterized in that at least one support roller (21), preferably a plurality of support rollers (21) for the film (2) is/are arranged on the upper run of the endless belt (19) and/or wherein at least one support roller (21), preferably a plurality of support rollers (21) for the film (2) is/are arranged on the lower run of the endless belt (19).
11. The device according to one of claims 1 to 10, characterized in that the film feeding head (3) can be displaced in covering direction (Ü) of the film (2) and opposite to the covering direction (Ü) of the film (2).
12. A method for wrapping stacks of goods (1) with a film (2), wherein film is fed from a feeding head base (6) of a film feeding head (3), for wrapping a first stack of goods (1), in particular of a non-square stack of goods (1) comprising the dimensions L · B, wherein a film portion (13) is severed from the film (2) and wherein this film portion (13) is pulled over the first stack of goods (1),
    wherein film (2) is initially fed from the feeding head base (6) to a film storage (11) of a manipulating device (7) of the film feeding head (3) for subsequently wrapping a second stack of goods (1), in particular a non-square stack of goods (1) comprising the dimensions B · L, which is rotated by 90° relative to the first stack of goods, wherein a film portion (13) provided for at least one covering process is stored in the film storage (11) and wherein the film portion (13) is severed from the film (2),
    wherein the manipulating device (7) is subsequently rotated relative to the feeding head base (6) provided that the film portion (13) can be pulled over the second stack of goods (1) and wherein the film portion (13) is then released from the film storage (11) and is pulled over the second stack of goods (1),
    characterized in that one end of the film portion (13) stored in the film storage (11) is sealed, while the manipulating device (7) is rotated.
13. The method according to claim 12, characterized in that the film portion (13) is opened during or after the rotation of the manipulating device (7).

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