DE102009026365B4 - Foil accumulator, device and method for producing containers - Google Patents

Abstract

Film store (1) for storing a part of an endless film (4) in a device (10) for producing packages wrapped with blanks of the endless film (4), wherein the film store (1) comprises an inlet (8) and an outlet (9) wherein the inlet (8) is associated with a first pair of rollers (33, 34) which can be driven with an adjustable first rotational speed and the second pair of rollers (35, 36) which can be driven with an adjustable second rotational speed, the endless foil (4) being associated with the outlet (9). between the rollers of the first pair of rollers (33, 34) and between the rollers of the second pair of rollers (35, 36) is feasible, characterized in that the film memory (1) comprises a movable film guide system (5, 6, 31, 32) in that the quantity of the part of the endless film (4) stored in the film store (1) is controllable under the interaction of the two pairs of rolls (33, 34), (35, 36) and the acting gravity (g), the film store (1) being surrounded an axis (41) perpendicular to a running direction (R) of the endless foil (4) is pivotable.

Description

The present invention relates to a film storage. In particular, the invention relates to a film store for storing a portion of a continuous film in a device for producing blanks enveloped with blanks of the endless film, wherein the film store comprises an inlet for the endless film, which is associated with a first pair of rollers drivable at an adjustable first rotational speed, and an outlet for the endless film, which is associated with a second pair of rollers drivable with an adjustable second rotational speed. The endless foil can be guided between each of the two roller pairs.

The present invention further relates to a device for producing containers with at least one such film storage.

The present invention also relates to a method of manufacturing containers in which the film store is used.

Devices for storing packaging film for articles, so-called film stores or dancers, are known from the prior art, in particular in devices for producing containers, for example from DE 37 27 339 A1 . EP 02 56 823 A1 and US 3,278,100 A , The articles are for example bottles or cans. Film stores serve as a buffer between a storage holder to be unwound - for example a film roll - and a film cutting device for separating the endless film in film blanks of a device for producing containers. In this case, containers are produced in that individual groups of the articles are each covered with a cut cut from a continuous film web by a film cutting device.

A film storage serves as a buffer device to regulate on the one hand during continuous production speed variations of the endless film and on the other hand to avoid a machine or production stop in a film roll change.

Film stores are equipped in a known embodiment with a film guide system in which an endless film web is guided meandering around several rotatable intermediate rollers. In this case, the intermediate rollers are fixed on one side to a displaceable and / or rotatable rocker, and the intermediate rollers on another side are fixed to a fixed suspension. Depending on the position of the displaceable rockers, a more or less large part of the endless film web is stored. When moving the rocker (s) and the associated intermediate rollers in the direction of the fixed suspension reduces the amount of storable film part in the film memory. Conversely, the storable part of the endless film in the film storage increases when the rocker (s) and the associated other intermediate rollers are moved away from the fixed suspension. A disadvantage of this arrangement is the cumbersome threading of the endless film on and between the rollers and compared to the storage volume high space requirements.

The German patent application DE 198 05 651 A1 discloses a flexible endless strip feeder from a stock holder (supply roll) to a processing station. Between the stock holder and the processing station, a storage (buffering) for the endless strip which stores the endless strip in a superimposed zig-zag shape is arranged. Legerollen at the bottom of the memory put the endless strip zig-zag-shaped from bottom to top as a stack in the memory.

The German patent DE 10 2007 010 994 B4 , the US patent application US 2007/0181737 A1 , the German patent application DE 101 63 762 A1 and the German patent application DE 10 2005 003 787 A1 each discloses another embodiment of a memory in which an endless belt is stored in a storage space between two rollers or roller pairs. The endless belt without a suspension and without swinging and associated with them intermediate rollers loose, without film tension and undefined or disordered stored in loops in the respective memory. In comparison to the previously described embodiment, it is advantageous here that the respective memory has a lower mass inertia and thus an increased dynamics of the memory is possible. In addition, these memories require less space and threading the endless tape is easier. The disadvantage, however, is that the endless belt tangled at the outlet of the memory and / or not accurately, that is, with a deviation from the original direction of the endless belt, to a downstream processing device, for example, to a cutting device for separating the continuous film in foil blanks passed. This leads to disruptions of the cutting device, thus to faulty blanks of the endless belt and ultimately to incorrectly manufactured containers.

The invention is therefore based on the object to provide a dynamic and yet trouble-free working film memory for storing a portion of a continuous film in a device for producing wrapped with blanks of the continuous film containers.

This object is achieved by a film store according to claim 1.

The invention is also based on the object of providing a powerful device for producing containers from blanks of an endless film with at least one film store for storing a part of the endless film.

This object is achieved by a device according to claim 9.

The invention is further based on the object of providing a dynamic and yet trouble-free method for producing containers wrapped in blanks from an endless film.

This object is achieved by a method according to claim 10.

The film storage device according to the invention comprises an inlet for the endless film, to which a controllably drivable first pair of rollers is assigned. Accordingly, the film storage comprises an outlet for the endless film, which is associated with a controllably driven second pair of rollers. The rotational speed of the rollers of the first pair of rollers and the rotational speed of the rollers of the second pair of rollers may be set equal or different. The endless film is guided in each case between the rollers of the first pair of rollers and between the rollers of the second pair of rollers. Between the roller pairs is the storage space of the film storage in which the endless film is stored. The film storage device comprises a movable film guiding system, by means of which the storable quantity of the endless film in the film storage can be regulated under the interaction of the two pairs of rollers and the acting gravity. The advantages of the gravity-utilizing sheet guiding system will be described below with reference to the embodiments.

In a preferred embodiment, the film guiding system comprises at least one rotatably mounted lower intermediate roll, which is arranged in at least one movable rocker. Optionally, the system further comprises at least two rotatably mounted upper intermediate rollers supported between a fixed suspension. It is also conceivable that no upper intermediate rolls are provided, so that the film is guided at the top only by the first and second roller pair and at the bottom by the at least one lower intermediate roller. The terms "up" and "down" are always used with respect to the direction of gravity. The position of the lower intermediate rolls is set according to the invention by interaction of the two pairs of rolls and the acting gravity. More specifically, the rotational speed of the first rolls at the inlet determines the amount of film feed into the film store. Accordingly, the rotational speed of the second rollers at the outlet determines the amount of film runoff from the film store. When the speeds of the first and second rollers at the inlet and outlet are the same, the amount of film in the reservoir remains the same. If the speed of the first rollers at the inlet is greater than the speed of the second rollers at the outlet, the amount of the film in the reservoir increases and the position of the lower intermediate rollers progressively descends along the direction of gravity from that of the upper intermediate rollers. The lower intermediate rolls lower as long until they are stopped by the film. Conversely, when the speed of the first rollers at the inlet is less than the speed of the second rollers at the outlet, the amount of film in the reservoir decreases and the lower intermediate rollers increasingly approach the upper intermediate rollers.

In all the cases described (constant, increasing, decreasing stored amount of film), these elements together with the film are pulled down with respect to the direction of gravity by the force acting on the lower rocker together with the lower intermediate rollers gravity. By the first and second roller pair at the inlet and outlet, the tension of the endless film is lowered within the film storage. Before and after the film storage, the film tension is higher and as usual, as it is to ensure a function of the entire Folienabrollung. On the other hand, within the store, the film tension is only as high as that produced by the weight of the lower intermediate rolls. As a result, the lower and upper intermediate rolls in the film store according to the invention (see 3 ) with a significantly lower mass or inertia in comparison to the known Folienspeichem with intermediate rolls (see 1 ).

In particular, the lower mass inertia forces of the moving parts of the film storage are advantageous, these are in particular the upper and lower intermediate rollers and the movable rocker. In comparison with the prior art, the same mass of the film guiding system can therefore be provided with a higher number of intermediate rolls, but lighter or thinner intermediate rolls, in the film store according to the invention. Due to the higher number of intermediate rolls a longer film web in the film memory can be stored, so a larger storage volume with the same compensation dynamics possible. The lighter and thinner intermediate rollers can be arranged close to each other, so that with the same space in the Compared to the prior art, the maximum possible storage volume is greater.

As described above, by the force acting on the lower intermediate rolls and the at least one lower rocker gravity, a foil tension is exerted on the part of the endless foil stored in the foil memory. As also described above, this film tension is relatively low, but sufficient to guide the film safely and in a defined manner over the upper and lower intermediate rolls in the film store even at high dynamics, ie when the amount to be stored changes at short intervals.

In a special embodiment of the film storage device, the second pair of rollers forms a correction unit at the outlet. By means of the correction unit, a movement component of the endless film can be imparted a movement component essentially transversely to the previous direction of travel, so that undesired deviations from a theoretical center line of the direction of travel of the endless film can be eliminated. in particular in a region around the outlet in the direction of a downstream of the film storage processing device. By means of the corresponding adjustment of the correction unit, the endless foil can thus be transferred precisely to fit, that is without a relevant deviation from the target running direction, to a further processing unit. The details are explained in detail in particular in the figure descriptions.

Preferably, one of the two rollers of the second pair of rollers is designed as a drive roller and has a spatially fixed axis of rotation. The other roller of the second pair of rollers is configured as a pressure roller which can be moved on the drive roller. At a first end of the pressure roller is a first contact pressure and at a second end of the pressure roller, a second contact pressure on the drive roller is exercisable. The two contact forces are independently controllable and adjustable via a control unit. If a deviation from the theoretical center line of the running direction of the endless film is detected, the contact forces can be adjusted so differently that the pressure roller is adjusted correspondingly obliquely to the drive roller (more precisely: the axes of the two rollers are no longer parallel to each other). Due to the skew, the direction of the endless film changes and the deviation from the specified direction of the endless film is corrected. It is obvious to a person skilled in the art that the first pair of rollers can also be designed as a drive and pressure roller at the inlet of the film store.

The two rollers of the respective pair of rollers at the inlet or outlet can each have a compressible layer on the outside or on their upper sides, for example of an elastomer.

In a further embodiment, the film store is provided with a boundary for the part of the endless film to be stored, for example a housing. The boundary is arranged between the inlet and the outlet of the film store. The part of the endless film to be stored is deposited without film tension and undefined in loops within the boundary of the film store. Such a film store, as also described above, is particularly suitable for the use of the inventive correction unit, since deviations from a desired running direction in a region around the outlet of the film store result due to the undefined storage of the endless film in the memory, so that a motion correction is desirable.

It is known from the prior art that for the production of parallel rows of containers, the endless film is divided and / or spread before it is fed to the film store or after leaving the film store. With each divided part of the endless foil a single row of containers is produced. Since the intermediate rolls of the film store according to the invention are arranged at the top and bottom with respect to the direction of gravity and, in addition, that a certain film tension acts on the endless film, optionally a spreading element can be provided within the film store, more precisely below the upper intermediate rolls and above the lower intermediate rolls. Such an arrangement saves space in the device for producing the packages. The spreading direction is substantially along the running direction of the film and transverse to the direction of gravity.

In the case of the known film stores, in which the part of the endless film to be stored is stored without loops in loops within the film store, it is not possible to spread the endless film within the film store. The endless film is undefined in the film storage and for a spreader is no defined starting point or no defined counterforce for spreading available.

The film storage device according to the invention therefore has three major advantages: the dynamically adjustable amounts of storable endless film in the film storage, the possibility of web correction of the endless film and the possibility of spreading the film within the film storage.

The film store according to the invention may furthermore comprise an axis running perpendicular to the running direction of the film. It is arranged centrally with respect to the plan view of the film storage. As a result, the film store can be pivoted such that the endless film leaves the film store to match a desired exit direction.

In the device according to the invention for producing containers, the film storage device according to the invention is followed by a film cutting device for separating the endless film into film blanks in the running direction, and a stock holder for the film is arranged upstream. If the second pair of rollers at the outlet of the film store is designed as a correction unit for imparting a movement component essentially transversely to the previous running direction, the direction of travel with respect to the downstream film cutting device can be changed. If the correction unit is equipped with a drive roller, it is conceivable that the drive for the drive roller also drives the foil cutting device. Alternatively, the drive roller can be driven by the film storage.

In the method according to the invention for producing bundles of articles wrapped with blanks of a continuous film, part of the endless film is guided between the rolls of the controllably drivable first pair of rolls of the inlet, then temporarily stored in the film store and between the rolls of the controllably drivable second pair of rolls Outlet further transported in one direction of the film. The actual amount of the stored amount of film and the target amount of the film to be stored in the film memory are determined. This results in a deviation from the actual quantity to the target quantity. The change in the actual amount is influenced by setting a first rotational speed of the first roller pair and setting a second rotational speed of the second roller pair. For this purpose, appropriate measuring and control units are provided.

In a particular embodiment of the method according to the invention, a second sensor unit assigned to the outlet of the film store determines a possible deviation of the running direction of the endless film from a predetermined center line. The determined deviation is then communicated by the second sensor unit to a control unit. The correction unit, which is likewise assigned to the outlet, is now set so that the running direction of the endless foil is changed or corrected. For this purpose, a movement component of the endless foil is impressed essentially transversely to the previous running direction by the correction unit of the running direction.

• 1 zeigt eine Einrichtung zum Herstellen von Gebinden mit einer Ausführungsform eines Folienspeichers mit Zwischenwalzen aus dem Stand der Technik.
• 2 zeigt eine Einrichtung zum Herstellen von Gebinden mit einer anderen Ausführungsform eines Folienspeichers aus dem Stand der Technik.
• 3 zeigt eine perspektivische Ansicht einer Ausführungsform des erfindungsgemäßen Folienspeichers mit unteren Zwischenwalzen und je einem Walzenpaar am Einlass und am Auslass.
• 4 zeigt eine Vorderansicht des Folienspeichers nach 3.
• 5 zeigt eine Seitenansicht des Folienspeichers nach 3.
• 6 zeigt eine Draufsicht des Folienspeichers nach 3.
• 7 zeigt eine Draufsicht des Folienspeichers nach 3, wobei der Folienspeicher schwenkbar ist.
• 8 zeigt eine perspektivische Ansicht einer weiteren Ausführungsform des erfindungsgemäßen Folienspeichers mit einem Spreizelement.
• 9 zeigt eine Seitenansicht des Folienspeichers nach 8.
• 10 zeigt eine Draufsicht des Folienspeichers nach 8.
• 11 zeigt eine perspektivische Ansicht einer Ausführungsform der erfindungsgemäßen Korrektureinheit mit einer Antriebswalze und einer Anpresswalze.
• 12 zeigt eine Ansicht eines Längsschnitts durch die Korrektureinheit nach 11.
• 13 zeigt eine Ansicht eines Ausschnitts der Antriebswalze und Anpresswalze der Korrektureinheit, wobei die Walzen nicht zusammengedrückt sind.
• 14 zeigt eine Ansicht des Ausschnitts der Antriebswalze und Anpresswalze nach 13, wobei die Walzen zusammengedrückt sind.

In the following, exemplary embodiments are intended to explain the invention and its advantages in more detail with reference to the attached figures.

• 1 shows a device for producing containers with an embodiment of a film storage with intermediate rolls of the prior art.
• 2 shows a device for producing containers with another embodiment of a foil store of the prior art.
• 3 shows a perspective view of an embodiment of the film memory according to the invention with lower intermediate rollers and one pair of rollers at the inlet and at the outlet.
• 4 shows a front view of the film storage after 3 ,
• 5 shows a side view of the film memory after 3 ,
• 6 shows a top view of the film memory after 3 ,
• 7 shows a top view of the film memory after 3 , wherein the film storage is pivotable.
• 8th shows a perspective view of another embodiment of the film storage device according to the invention with a spreading element.
• 9 shows a side view of the film memory after 8th ,
• 10 shows a top view of the film memory after 8th ,
• 11 shows a perspective view of an embodiment of the correction unit according to the invention with a drive roller and a pressure roller.
• 12 shows a view of a longitudinal section through the correction unit 11 ,
• 13 shows a view of a section of the drive roller and pressure roller of the correction unit, wherein the rollers are not compressed.
• 14 shows a view of the section of the drive roller and pressure roller after 13 , wherein the rollers are compressed.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference numerals in the individual figures are shown, which are required for the description of the respective figure.

1 shows a device 10 for producing containers with an embodiment of a film store 1 from the prior art. First, a storekeeper 2 the device 10 continuous film during operation 4 to disposal. Indicated is the stockholder 2 in a roll form, the film store 1 in the direction of travel R the endless foil 4 is subordinate. The stockholder 2 However, it can also be configured differently.

In the direction of travel R will be the endless foil 4 from the stockholder 2 continue to and through the film storage 1 the device 10 transported, then to a film cutter 3 the device 10 that the endless foil 4 in individual schriitte (not shown) separates. Each foil blank is then wrapped around a group of articles into a bundle (not shown).

The stockholder 2 and the foil cutter 3 are in 1 shown only very schematically, since they are irrelevant to the gist of the invention.

On a movably mounted rocker 6 is a variety of rotatable intermediate rollers 32 and on a fixed suspension 5 is a variety of rotatable intermediate rollers 31 stored. An endless foil 4 becomes meandering or in loops over the intermediate rolls 31 . 32 guided. An area around the top intermediate roll 32 forms the inlet 8th of the film storage 1 ,

By adjusting the movably mounted rocker 6 together with the intermediate rollers 31 can the amount of endless foil 4 in the foil store 1 be regulated. In a first position P ₁ the movably mounted swingarm 6 (dashed lines) is the film memory 1 almost empty or it is a small amount of foil stored. In a second position P ₂ is the foil store 1 almost full (solid lines) or it is a large amount of film stored. The regulation of the film storage 1 So adjusting the position P ₁ or. P ₂ the movable swingarm 6 , is done as follows: a controller 17 detected by a first sensor unit 18 the position P ₁ or. P ₂ the movable swingarm 6 and thus the current storage volume of the film storage 1 , Based on the sensor information is the brake 20 activated: the moving rocker approaches 6 of the film storage 1 the position P _min with minimal storage volume, so will the brake 20 opened, and the stockholder 2 makes endless film 4 for filling the foil store 1 ready. If, on the other hand, the movable rocker 6 of the film storage 1 approaches the position Pmax at maximum storage volume, the brake becomes 20 dressed, and the stockholder 2 no longer presents endless foil 4 for filling the foil store 1 ready.

The further transport of the endless foil 4 or the film removal from the film storage 1 takes place by means of driven second rollers 35 . 36 at or after the outlet 9 of the film storage 1 , The foil tension F _B arises from the fact that the stockholder 2 through the brake 20 is braked controlled and one on the movable swingarm 6 attached cylinder 16 this with a constant force F _Z stressed.

According to the stockholder 2 vt diagram shown is the speed v the endless foil 4 on a section between the stockholder 2 and the foil storage 1 essentially constant. By contrast, the film speed varies v after leaving the foil store 1 according to the next to the driven second rollers 35 . 36 represented vt diagram, so that the film removal from the second rolls 35 . 36 unevenly done.

The functional principle of the film storage 1 now requires that in comparison to the film storage according to the invention 1 relatively high film tension F _B also at the intermediate rolls 31 . 32 is applied and they must therefore be sized accordingly large. A disadvantage here and complementary to the above-described advantages of the film storage device according to the invention is that for large intermediate rolls 31 . 32 the inertia forces are high, the maximum storage volume is limited, and the film storage 1 to 1 comparatively little dynamic works.

An independent and constant cylinder force independent of the uneven film removal and storage volume F _Z and thus constant film tension F _B in areas before, in and after the film storage 1 is achieved by the pressure in the cylinder 16 is controlled to a fixed value. The foil tension F _B is set exclusively via this cylinder pressure value.

The foil store 1 So in addition to the film storage also serves to generate a film tension F _B and the compensation of the uneven film print.

In the known embodiment according to 1 is the direction of travel R the film web 4 between opposing intermediate rolls 31 . 32 not parallel to the direction of gravity G ,

2 shows a device 10 for producing containers with another embodiment of a film store 1 from the prior art. The endless foil 4 will be between the rollers 33 . 34 a first pair of rollers in the film storage 1 guided and between the rollers 35 . 36 a second pair of rollers from the film storage 1 guided.

Next to the rollers 33 . 34 . 35 . 36 includes the film guide system of the film storage 1 a limit 7 For example, a housing in which the endless film 4 loose, without foil tension F _B and stored undefined or disordered in loops.

3 shows a perspective view of an embodiment of the film storage device according to the invention 1 each with a first pair of rollers 33 . 34 at the inlet 8th and a second pair of rollers 35 . 36 at the outlet 9 of the film storage 1 , The rotational speeds of the first rolls 33 . 34 on the one hand and the rotational speeds of the second rolls 35 . 36 On the other hand, the same or different can be set to the amount of the stored part of the endless film 4 between the upper intermediate rolls 32 and the lower intermediate rolls 31 to regulate, as already described above. The endless foil 4 is via the rotatable upper intermediate rollers 32 and the rotatable lower intermediate rolls 31 in the foil store 1 guided. The upper intermediate rollers 32 are locally fixed to a suspension (not shown). The lower intermediate rolls 31 are along the direction of gravity G and thus on the upper intermediate rolls 32 to or from these movably arranged on at least one rocker (not shown). The foil tension F _B within the foil store 1 is through the two pairs of rollers 33 . 34 . 35 . 36 in contrast to 1 comparatively low, what the inertia of the film memory 1 decreases and increases the dynamics, as already described in detail above. As also described above, the position of the lower intermediate rolls is 31 by interaction of the two pairs of rollers 33 . 34 and 35 . 36 and the acting gravity G along the direction of gravity G adjustable. The foil 4 Be sure about the upper and lower intermediate rolls 31 . 32 guided.

In the middle of the film storage 1 is an axis 41 shown to the the film memory 1 is pivotable. The second rolls 35 . 36 at the outlet are as a correction unit 11 designed, the upper roller 36 as a pressure roller and the lower roller 35 as a drive roller. More details will be available 11 described.

4 shows a front view, 5 a side view and 6 a plan view of the film storage 1 to 3 ,

7 shows a top view of the film memory after 3 that represents how the foil store 1 around his axis 41 at a second angle ρ or -p is pivotable, so that the previous direction R the endless foil 4 corresponding to the second angle ρ or. - ρ will be changed. The pivoting of the film storage 1 can also be used to guide the direction R the endless foil 4 when leaving the foil store 1 to correct.

8th shows a perspective view of another embodiment of the film storage device according to the invention 1 with a spreading element 40 that inside the foil store 1 in an area at the outlet 9 is arranged. The inlet 8th , the outlet 9 , the rollers 33 . 34 . 35 . 36 and the intermediate rolls 31 . 32 are like the ones 3 to 7 designed.

As described in detail above and in contrast to Folienspeichem 1 to 2 it is in this embodiment of particular advantage that a spreader 40 within instead of outside the foil store 1 can be provided. Generally, the film can 4 either in front of the foil store 1 cut and spread, in front of the film storage 1 cut and in the foil storage 1 be spread, in the film storage 1 cut and spread, in the film storage 1 cut and after the foil storage 1 be spread or after the film storage 1 be cut and spread. In case of 8th will be the endless foil 4 divided along a partial line 42 the inlet 8th supplied, in already divided state via the intermediate rollers 31 . 32 guided and then through the spreader 40 spread apart. For a person skilled in the art, it is obvious that the expansion element 40 also partially or completely outside the film storage 1 can be subordinated.

9 shows a side view of the film storage 1 to 8th ,

10 shows a plan view of the film storage 1 to 8th , where the endless foil 4 after leaving the expansion element 40 is transported further in two spaced partial webs.

11 shows a perspective view of an embodiment of the correction unit according to the invention 11 with a drive roller 35 and a pressure roller 36 , The gap between the rollers 35 . 36 forms an outlet 9 of the film storage 1 , By the rotational movement of the drive roller 35 will be the endless foil 4 from the foil store 1 pulled out. The pressure roller 36 is movable towards the drive roller 35 stored.

The drive roller 35 is spatially fixed in their position. By the rotational movement of the drive roller 35 around a spatially fixed axis of rotation 353 is the endless foil 4 in the direction of travel R transportable. The drive roller 35 can be driven by an internal or external drive (not shown).

The pressure roller 36 is movable with respect to the drive roller 35 stored. At a first end 361 the pressure roller 36 can be a first contact force F ₁ and at a second end 362 the pressure roller 36 can be a second contact force F ₂ on the drive roller 35 be exercised, so that the pressure roller 36 at their ends 361 . 362 on the drive roller 35 can be pressed. The pressure roller 36 is relative to the drive roller 35 tiltable (see 13 and 14 ).

So the rollers 35 . 36 through the pressure forces F ₁ . F ₂ are responsive and deformable (see 14 ), have both rolls 35 . 36 on their respective surface a compressible, for example made of an elastomeric layer 12 on. The layer 12 can be designed differently, for example with a rubber coating. The layer 12 can be continuous, with a profiling and / or with columns 15 on the rollers 35 . 36 to be appropriate. Through the column 15 A deformation is even better and without too much mechanical stress of the layer 12 possible if the contact forces F ₁ . F ₂ be created. However, it is obvious to a person skilled in the art that the layer 12 may also be configured differently without departing from the scope of the invention.

The rollers 35 . 36 are at their ends 361 . 362 about a camp 13 , which carries appropriate ball bearings stored. About an adjustment unit 14 at both ends 361 . 362 the roller 36 can the contact forces F ₁ . F ₂ be set, for example, purely manually as in 11 shown. Likewise, an automatic adjustment of the contact forces F ₁ . F ₂ possible. Preferably, the contact forces F ₁ . F ₂ set independently and are the same or different adjustable.

The endless foil 4 ideally should be centered between the second rollers 35 . 36 be conveyed guided, so centered with respect to a center line 25 , So you can make sure that the endless foil 4 on a desired transport path (not shown) further transported and accurately aligned aligned to a downstream processing device (not shown) is passed. To a deviation 26 the endless foil 4 from the center line 25 To determine is in the embodiment shown here, a second sensor unit 24 , For example, two sensors, provided, each having a first distance e1 and a second distance e2 to the lateral edges of the endless foil 4 determine. Dodge the two distances e1 . e2 from each other, there is a deviation 26 greater than zero before. Otherwise there is no deviation 26 before, and the endless foil 4 is aligned correctly. Usually, the deviation becomes 26 from the difference between the two distances e1 . e2 in a control unit 23 calculated to which the distances e1 . e2 from the second sensor unit 24 be transmitted.

The control unit 23 then determines from the calculated deviation 26 the required tilt of the pressure roller 36 with respect to the drive roller 35 and from this the required contact forces F ₁ . F ₂ to a deviation from the specified running direction R to correct. The control unit 23 is also with the adjustment units 14 at the ends 361 . 362 the pressure roller 36 connected and transmitted the calculated contact forces F ₁ . F ₂ to the adjustment units 14 , The adjusting units 14 the pressure roller 36 then practice the calculated contact forces F ₁ . F ₂ on the drive roller 35 out, as in the 13 and 14 is described in detail. In case of a deviation 26 greater than zero thus becomes a corresponding setting of the correction unit 11 made to the running direction R the endless foil 4 transverse to the previous direction R to change, namely a movement component 27 due to the deviation 26 the endless foil 4 to impose the deviation 26 compensate.

In the embodiment according to 11 are the control unit 23 and the second sensor unit 24 as separate elements, but they can also be configured in one unit.

12 shows a view of a longitudinal section through the correction unit 11 to 11 , All elements are already in 11 described.

13 shows a view of a section of the drive roller 35 and pressure roller 36 the correction unit 11 out 12 , wherein the pressure roller 36 such on the drive roller 35 is pressed that no correction of the direction of travel 6 takes place. The contact forces F ₁ . F ₂ at the ends 361 . 362 the pressure roller 36 are identical, so that the rotational axis AB of the pressure roller 36 parallel to the axis of rotation CD or 353 of the drive roller 35 is. There is no or a symmetrical deformation of the surfaces of the rolls 35 . 36 on. Thus, the experience between the rollers 35 . 36 endless foil to be transported 4 no influence in their running direction R , Now, however, a deviation 26 the endless foil 4 from the required direction R determined how in 11 described. The detected deviation 26 is corrected as in 14 described.

14 shows a view of the section of the drive roller 35 and pressure roller 36 to 13 , wherein the pressure roller 36 now on the drive roller 35 is pressed, so that the axis of rotation AB of the pressure roller 36 and the rotation axis CD of the drive roller 35 at a first angle φ are inclined to each other.

Will a deviation 26 the endless foil 4 from the fixed, theoretical centerline 25 recognized, for example as in 11 can be described by tilting the pressure roller 36 with respect to the drive roller 35 a correction will be made. The tilting is done by applying different controllable contact forces F ₁ . F ₂ reached. Through the gumming of the layers 12 the two rolls 35 . 36 is it possible to go to the first angle φ belonging outer diameter d the drive roller 35 to influence, especially at the second end 352 the drive roller 35 , Due to the unilateral increase in contact pressure F ₂ in comparison to the lower contact force F ₁ the inclination of the pressure roller changes 36 represented by the first angle φ , and thus deforms the rubberized outer diameter d the drive roller 35 towards the second end 352 the drive roller 35 ,

Due to the inclination of the drive roller 35 act on the endless foil 4 at their edges different transport forces, through which the deviation 26 from the direction of travel R is corrected. This will make the endless film 4 after leaving the correction unit 11 transported accordingly obliquely, so that the running direction R the endless foil 4 change accordingly and as desired. The endless foil 4 can thus during further transport to a downstream processing device, such as a film cutting device 3 according to the 1 and 2 to be aligned as needed.

So the first angle φ arbitrary and as required adjustable, should the two contact forces F ₁ . F ₂ independently of each other by the adjustment 14 to 11 can be regulated.

The invention has been described in consideration of preferred embodiments. However, it will be understood by those skilled in the art that modifications and changes may be made without departing from the scope of the following claims.

LIST OF REFERENCE NUMBERS

1

film storage

2

stocker

3

Sheet cutting device

4

Endless foil (foil web)

5

firmly mounted suspension

6

movable swingarm

7

Limitation (housing)

8th

inlet

9

outlet

10

Device for producing containers

11

correction unit

12

layer

13

warehouse

14

adjustment

15

gap

16

cylinder

17

regulator

18

first sensor unit

20

brake

23

control unit

24

second sensor unit

25

center line

26

deviation

27

movement component

31

first / lower intermediate roller

32

second / upper intermediate roller

33

first roller (drive roller)

34

first roller (pressure roller)

35

second roller (drive roller)

352

second end of the second roller

353

Rotation axis of the second roller

36

second roller (pressure roller)

361

first end of the second roller

362

second end of the second roller

40

spreader

41

axis

42

subline

F _B

film tension

F _Z

cylinder force

F ₁

first strength

F ₂

second force

P ₁

first position

P ₂

second position

P _min

Position of the movable rocker with minimal storage volume

P _max

Position of the movable rocker with maximum storage volume

R

direction

φ

first angle

ρ

second angle

d

outer diameter

e1

first distance

e2

second distance

G

gravity

t

Time

v

Speed of the endless film (film speed)

Claims (11)

Film store (1) for storing a part of an endless film (4) in a device (10) for producing packages wrapped with blanks of the endless film (4), wherein the film store (1) comprises an inlet (8) and an outlet (9) in that a first pair of rollers (33, 34) which can be driven with an adjustable first rotational speed and the outlet (9) are assigned a second pair of rollers (35, 36) which can be driven with an adjustable second rotational speed, the endless foil (4) being associated with the inlet (8). between the rollers of the first pair of rollers (33, 34) and between the rollers of the second pair of rollers (35, 36) is feasible, characterized in that the film memory (1) comprises a movable film guide system (5, 6, 31, 32) in that the quantity of the part of the endless film (4) stored in the film store (1) is controllable under the interaction of the two pairs of rolls (33, 34), (35, 36) and the acting gravity (g), the film store (1) being surrounded an axis (41) perpendicular to a running direction (R) of the endless foil (4) is pivotable. Foil storage (1) after Claim 1 wherein the film guiding system comprises at least one rotatably mounted lower intermediate roll (31) arranged in at least one movable rocker (6) and at least two rotatably mounted upper intermediate rolls (32) mounted between a fixed suspension (5), wherein the position of the at least one lower intermediate roller (31) by the interaction of the two pairs of rollers (33, 34), (35, 36) and the acting gravity (g) is adjustable. Film store (1) according to one of the preceding claims, wherein by the second pair of rollers (35, 36) at the outlet (9) the running direction (R) of the endless film (4) imposing a movement component (27) substantially transversely to the previous direction (R) is. Foil storage (1) after Claim 3 wherein the rollers of the second roller pair (35, 36) each have a compressible layer (12) on the outside. Foil storage (1) after Claim 4 wherein the layer (12) comprises an elastomer. Foil accumulator (1) according to one of Claims 3 to 5 wherein the one of the two second rollers of the second pair of rollers (35, 36) is configured as a drive roller and a spatially fixed axis of rotation (353), and wherein the other roller of the second pair of rollers (35, 36) as a pressure roller on the drive roller is configured, wherein at a first end (361) of the pressure roller, a first contact pressure (F ₁ ) and at a second end (362) of the pressure roller, a second contact force (F ₂ ) on the drive roller is exercisable. Foil storage (1) after Claim 6 , wherein the two contact forces (F _1, F ₂ ) via a control unit (23) are independently controllable. Foil store (1) according to one of the preceding claims, wherein the foil store (1) comprises a spreading element (40) for spreading the endless foil (4). Device (10) for producing containers with at least one film store (1) enveloped with blanks of an endless film (4) according to one of the preceding claims, wherein the at least one film store (1) is arranged downstream of a stock holder (2) in the running direction (R) and a film cutting device (3) for separating the endless film (4) is arranged upstream in film blanks. Method for producing bundles of articles which have been wrapped with blanks of an endless film (4), using a film store (1) according to one of the Claims 1 to 8th in which a part of the endless foil (4) is temporarily stored in the foil store (1), between the controllably drivable first pair of rollers (33, 34) of the inlet (8) and the controllably drivable second pair of rollers (35, 36) of the outlet (9) of Foil storage (1) in the direction of travel (R) is transported, characterized by the following steps: determining an actual amount and a target amount of the film memory (1) storable part of the endless foil (4); and controlling the change of the actual amount by adjusting the first rotational speed of the first roller pair (33, 34) and adjusting the second rotational speed of the second roller pair (35, 36). Method according to Claim 10 method comprising: determining a deviation (26) of the running direction (R) of the endless film (4) from a center line (25) through a second sensor unit (24) associated with the outlet (9); Communicating the deviation (26) from the second sensor unit (24) to the control unit (23); and • changing the running direction (R) of the endless foil (4) in that the movement component (27) is impressed substantially transversely to the previous running direction (R) by a correction unit (11) of the running direction (R) of the endless foil (4) the correction unit (11) is also associated with the outlet (9).

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