Reefing device

The invention relates to a wrapper with at least one wrapping rod and at least one drive unit having moving means which, for wrapping a portion of a tubular film, is brought into operative connection with a wrapping rod, at least at the coupling point, when the film part is enveloped. tubular, and transfers a portion of the tubular film relative to the wrapping mandrel. The invention also relates to a method of wrapping a portion of a tubular film by means of a wrapper according to the invention.

[0002] Such wrapping devices and methods are known per se e.g., from US 4473990 or EP 1574432. Some of them are used, for example, in hood wrappers. These can be bookmarks that operate based on the hood stretching process or hood shrinking process. Both processes are characterized in that part of the tubular film is stretched or slipped onto any load, or in that a load is introduced into a part of the tubular film by means of a lifting table. This process is defined in the document as freight wrapping. Wrapping cargo with a part of tubular film is usually used for packing and transporting cargo, securing it during loading and protection against the effects of weather conditions. In this respect, part of the tubular film that is applied to the load can be designed not only as a hood, but also

[0003] For most hood wrappers, a portion of the tubular film is first wound onto the wrapper so that it can then be applied to the load by means of a wrapping machine or a separate tensioning device, and thus unwound. During wrapping, the supply of the folded tubular film, which is referred to in the document as a film roll, is formed at the bottom of the wrapping rods. If the wrapper is also used for stretching, the wrapper moves relative to the load, optionally after stretching a portion of the tubular film. During this relative movement, a portion of the tubular film is removed from the wrapping mandrels, and is then also referred to as unwound. For this reason, the film roll is formed during wrapping and the film roll is exhausted during unwinding. In this respect, the term wrapping, as well as wrapping progress or the like also apply to unwinding. For wrapping, the wrapping mandrels are usually inserted into the open portion of the tubular film from below or the film is lowered onto the wrapping mandrels. To then move a portion of the tubular film relative to the wrapping rod, and place it on the folds, the generic wrappers have at least one drive unit of any design with moving means, such as for example a mechanical belt conveyor or a wrapping roller drive.

[0004] For winding a portion of the tubular film, the drive unit is brought into operative connection with the wrapping rod, at least at the point of engagement during the wrapping of a portion of the tubular film. This can happen, for example, by pressing the drive unit or means for displacement to the wrapping rod at one point. Then, by means of a drive unit or displacement means, a part

The pipe loop can be moved relative to the wrapping mandrels due to the pressure of the discharge, and slipped or pulled from said spindle. Thus, a friction connection is generally created between the drive unit or the displacement means and a part of the tubular film. At least one coupling point is to be understood as at least one site that includes at least one point or multiple points, e.g. in a manner similar to a line or surface area.

[0005] In order to achieve optimal wrapping of the load, homogeneous fold formation is preferred, which is as much as possible in parallel. They should be produced during the wrapping of a part of the film, and thus during the construction of the film roll. The heterogeneous formation of the folds consequently results in the fact that during the wrapping of a portion of the tubular film, the respective area of ​​the tubular film portion is subjected to an increased load resulting from the rapid pulling of the tubular film. It is not unusual to bring part of the tubular film to stretch, which causes the film to become very thin and even rupture, thereby reducing the quality of the wrapping of the load.

[0006] The invention aims to improve the winding of a part of a tubular film, thereby achieving a general improvement in the quality of the wrapping of the load.

[0007] This object is achieved by means of a device according to claim 1 and a method according to claim 10. Preferred embodiments of the invention are described in the dependent claims.

[0008] The wrapping machine according to the invention differs from the wrapper initially described in that the position of the at least one coupling point can change along the wrapping mandrel as the wrapping proceeds. Unlike the previously known devices, the position of the coupling point is adapted during wrapping to the size of the film roll. Consequently, a substantially constant distance between the film web and the coupling point can be maintained, thereby ensuring an even film formation during wrapping and optimal unwinding during the unwinding of a portion of the tubular film.

[0009] For using the film at the height of the various coupling points, for a plurality of coupling points, it is preferred that the position of the lowest coupling point is variable along the wrapping mandrel as the wrapping proceeds. As the lowest point of coupling, it is intended to mean the point of coupling which is the closest to the turn of the foil or bottom of the wrapping mandrel. Consequently, it is possible that only the position of the lowest coupling point can be varied along the longitudinal axis of the wrapping spindle, while the second coupling point remains invariably in its position. This has the advantage that the drive means can operate in a part of the tubular film in several places, and consequently without defects and at relatively low construction costs. However,

In the method, at least one opposite roll is attached to the wrapping mandrel in such a way that the opposing rollers can be brought into operative connection with the moving means during the wrapping process, during the wrapping of a portion of the film.

-3rurowa and thus determine the coupling point. The opposite roll reduces the friction between the wrapping mandrel and the tubular foil.

Preferably, at least one opposite roll is attached to the wrapping mandrel in such a way that the position of the opposing roll on the wrapping mandrel can be varied as the wrapping proceeds. In the case of fixed means for displacement, the coupling point can thus be varied as a result of the change of the opposite roll position on the wrapping mandrel.

Preferably, at least one opposite roll is attached to the wrapping mandrel in such a way that it is longitudinally and / or transversely displaceable and / or rotatable with respect to the wrapping mandrel. The movement in the longitudinal direction relative to the wrapping rod can be understood here as a movement along the longitudinal axis of the wrapping mandrel. Accordingly, the lateral movement of the wrapping mandrel means lateral movement along the longitudinal axis of the wrapping rod. This is advantageous because the movement of the opposite roll is accompanied by a corresponding change of the position of the coupling point. Accordingly, on one hand, the lateral displacement or the corresponding rotation of the opposing roller can determine a fixed point of engagement which is variable in position relative to the wrapping mandrel. On the other hand, the coupling point can be re-created and removed if necessary by lateral displacement or a corresponding rotation of the opposite roll. It is also possible that the coupling point is formed first, for example by the lateral movement of the opposing roller, and then changed in relation to the wrapping mandrel by the lateral movement of the opposing roller before the coupling point is again removed by further lateral movement.

[0013] Preferably, a plurality of opposing rolls is on the wrapping rod in such a way that the individual opposing rollers can be brought into operative connection with the moving means as the wrapping proceeds. Accordingly, a plurality of coupling points can be formed, it being possible to change the position of the lowest coupling point by creating and removing consecutive working connections of individual opposing rolls with the moving means.

[0014] In the method, at least one fixed opposing roller can be placed on the upper end of the wrapping mandrel. This opposite roll serves first of all to safely guide a portion of the film at the upper end of the wrapping mandrel. However, it can also be used to create a coupling point in the sense of the invention, i.e. when the drive unit is brought into operative connection with the roller. Accordingly, the upper end of the wrapping mandrel should be understood as the end which is generally furthest away from the film roll.

Preferably, the drive unit and / or the moving means can be at least partially variable in its / their position with respect to the wrapping pin. Accordingly, the position of the coupling point can be changed by changing the position of the drive unit or displacement means relative to the wrapping mandrel.

[0016] In fact, the displacement means may be a drive shaft or a continuous belt. However, it is also possible that the displacement means comprise a number of drive shafts that can, for example, be activated in an asynchronous manner. The surface of the moving means is expediently profiled or coated in such a way that the ideal coefficient of friction for the movement of the tubular film portion is achieved.

In the method, the displacement means are rotatably and / or slidably configured such that during wrapping they can be brought into operative connection with the wrapping mandrel, while surrounding a portion of the tubular film, at different heights depending on the progress of the wrapping. This has the advantage that the displacement means can be used to define at least one coupling point whose position is changed by the rotation and / or displacement of the means for displacement. Consequently, the design of the wrapping mandrel can be relatively simple and does not need to be changed compared to conventional wrapping blades for carrying out the invention.

[0018] Preferably, the displacement means can be moved together with at least one opposite roller. In a preferred manner, for this purpose, the displacement means are rotatably and / or slidably configured such that during winding they are in operative engagement with at least one rotatable and / or slidable opposing roller when surrounding the tubular film portion, depending on the progress of the winding. wrapping when at least the position of the lowest coupling point is variable by displacing and rotating the displacement means and the opposing roller. The at least one coupling point is thus defined by at least one opposing roll and by the moving means and can be held on the film throughout the wrapping time when the position of the at least one coupling point is changed. As a result, the distance between the lowest coupling point and the film roll is largely constant and as small as possible. In this way, an optimal wrapping result can be achieved.

[0019] Preferably, the displacement means are rotatably and / or slidably configured such that during wrapping they can be brought into operative connection with different opposing rolls, while surrounding a portion of the tubular film, depending on the progress of the wrapping. Accordingly, the position, in particular of the lowest coupling point, can be intermittently changed so that the displacement means are brought into operative connection with the various opposing rollers, one after the other.

[0020] Furthermore, the wrapper can be designed in such a way that it comprises a plurality of wrapping mandrels and associated drive units, whereby the individual wrapping rod is activated by the associated drive unit. For example, four wrapping pins can be provided with four correspondingly associated drive units that are respectively arranged in the angles of a typical packaging unit, e.g. a pallet. In the case of such a wrapper construction, individual wrapping pins can be operated by their drive units separately and independently of one another, for example when it is desired to obtain the formation of a specific fold, for example to reinforce the generated package. Operation

The wrinkling can be adapted to the appropriate conditions, e.g. a more complex form of wrapping load. If, for example, an asymmetrical load is to be wrapped, it may be advantageous to use a larger coil in one or more wrapping mandrels.

[0021] As already mentioned, the subject matter of the invention is achieved by a method of wrapping a portion of a tubular film according to claim 14. The method according to the invention stands out compared to known methods in that the position of the lowest coupling point on the wrapping mandrel varies with the progress of the wrapping.

[0022] In contrast to the previous methods, the position of the coupling point is adjusted during wrapping to the size of the film roll. Accordingly, the distance between the film web and the coupling point can be kept substantially constant so that a more uniform formation of folds during wrapping and better roll-up of the film roll during unwinding of a portion of the tubular film is obtained.

[0023] Preferably, during the wrapping of the tubular film portion, the lowest coupling point is offset from the lower end of the wrapping mandrel to the upper end of the wrapping mandrel. This provides a substantially constant and preferably minimal distance between the lowest coupling point and the film roll, whereby a more uniform and constantly parallel folding of the folds in the film web during the winding of a portion of the tubular film is obtained.

[0024] Furthermore, preferably, during the unwinding of the portion of the tubular film, the lowest point of engagement is moved from the upper end of the wrapping mandrel to the lower end of the wrapping mandrel. As a rule, the constant and the smallest possible distance between the lowest coupling point and the film roll during unrolling causes that part of the tubular film is removed or unwound from the wrapping mandrel more evenly than before. This also prevents that part of the tubular film becomes thin and even tears as a result of the sudden removal of a portion of the tubular film.

[0025] Preferably, the position of the lowest coupling point is varied by the displacement and / or rotation of at least one opposite roller of the wrapping mandrel. In this way, the movement of at least one opposing roll can affect the corresponding change of the position of the coupling point. The longitudinal displacement or rotational movement of the opposing roller can therefore determine a fixed coupling point that is variable in its position relative to the wrapping mandrel, wherein the lateral displacement or rotation of the opposing roller forms or removes the coupling point.

[0026] Preferably also, the position of the lowest coupling point is changed by the displacement and / or rotation of the displacement means. In this way, maintaining a constant distance of the coupling point from the film roll can be achieved with a relatively small amount of work.

[0027] The invention will be explained in more detail below on the basis of exemplary embodiments which are shown in the drawings in which they are shown schematically:

-6Fig. 1.1 to 1.5

Figures 2.1 to 2.6

Fig. 3

Fig. 4

Figs. 5.1 to 5.5

Fig. 6

Fig. 7 shows a detail of a first embodiment of a wrapper according to the invention with an opposite roll, which can be moved in the transverse direction and in the longitudinal direction;

show a detail of a second embodiment of a wrapper according to the invention with two displaceable transversely opposite rolls;

shows a section along line AA of the wrapper shown in fig. 2; shows a side view of the lever mechanism of fig. 3;

show details of a third embodiment of a third wrapper with displacement means;

is a side view of a hood liner with a wrapper according to the invention; and depicts a cross section of the BB of the hoodmaker device shown in Fig. 6.

Identical elements are provided with the same designations in the text below, and are provided with the same reference numerals in these drawings.

[0028] Embodiments of the wrapper 1 according to the invention, which are shown in Figures 1, 2 and 5, comprise a total of four wrapping tubes 2, which are arranged in the corners of the four-cornered wrapping frame and can be individually activated by means of associated drive units 3 for wrapping part of the tubular film 4. However, for a better presentation of the invention, only one of the two wrapping mandrels with the associated drive unit 3 is shown in Figures 1, 2 and 5.

[0029] For all three examplesthese embodiments shown here, the corresponding L-shaped wrapping lugs 2 have rigidly mounted opposite rollers 5 at the upper end of the vertical member. On the horizontal members of the wrapping rods 2, the drive unit 3 is respectively arranged slidably. Each drive unit 3 has a motor 6 and displacement means 7, the motor 6 drives the displacement means 7. In all three embodiments shown herein, the displacement means 7 are configured as a continuous belt, although it is understood that they can be a single one. roll or the like. The drive units 3 and their displacement means 7 can be respectively moved along the guide rails and thus brought into operative connection with the wrapping wheels 2.

[0030] In the detail of the first embodiment of the wrapper according to the invention shown in fig. 1, in addition to the permanently but rotatably connected opposite roller 5, the wrapping winding 2 further has an opposite roll 9 that is slid transversely and longitudinally relative to the wrapping roll 2. This opposite roll it can be completely withdrawn from the wrapping rod 2 as shown in Fig. 1.1, or it can be stretched as shown in Fig. 1.2. The counter-rotating roll 9 thus determines the lowest point of coupling A.

[0031] The inventive method of wrapping a portion of a tubular film 4 according to the first embodiment is described below on the basis of Figures 1.1 to 1.5.

[0032] Fig. 1.1 shows the wrapper 1 during the process step in which part of the tubular film 4 has been pushed out of the wrapping rod 2, and then the four wrapping pins 2 have been slightly spaced apart. Consequently, the opposite roll 5, which is fixedly fixed at the upper end of the wrapping pole 2, is in contact with the inner side of the tubular film part 4. The drive unit 3 has not yet been brought into operative connection with the wrapping rod 2 while surrounding a portion of the tubular film 4.

[0033] As shown in Fig. 1.2, the drive unit 3 is displaced in a horizontal direction. Then the first coupling point, referred to in the document as the fixed coupling point PA, is formed on the opposite roll 5. At the same time, the opposite roll 9 is expanded. Here too, the displacement means 7 are brought into operative engagement with the opposite roller positioned on the wrapping mandrel 2 and the second, lowest coupling point A is formed when surrounding a portion of the tubular film 4.

[0034] Next, as shown in Fig. 1.3, the displacement means 7 are driven by a motor 6 so that part of the tubular film 4 is moved relative to the wrapping rod 2 and is therefore wound. At the bottom of the wrapping rod 2 is a portion of the tubular film 4 forming a roll of film 8. As can be seen in Figure 1.3, the roll of film 8 increases with advancing wrapping until the upper end of the film roll 8 almost spatially coincides with the lowest point of coupling A.

[0035] As can be seen in Figure 1.4, the slidable opposing roll 9 is moved along the longitudinal axis of the wrapping pin 2 towards the upper end of the wrapping pin 2, the distance between the film roll 8 and the lowest engagement point A being determined with respect to the opposite roll 9 , it is basically constant. As the film roll 8 expands, the position of the lowest coupling point A is moved towards the upper end of the wrapping pole 2. This provides constant conditions in which the formed folds form uniform folds in the film roll 8.

Immediately after the opposing roller 9 is moved along the wrapping pole 2 to the maximum, i.e., the highest position on the wrapping mandrel 2, the opposing roll 9 moves or rotates in a direction transverse to the winding direction 2, as shown in Fig. 1.5, and consequently it is withdrawn from the wrapping spindle 2. This removes the operative connection between the opposing rollers 9 and the displacement means 7. Consequently, the oppositely attached roller 5 is rigidly attached, which is still in operative connection with the displacement means 7 when surrounding a portion of the tubular film 4 , determines both the constant coupling point PA and the lowest point of coupling A. At the same time,the wrapping operation ends, creating a sufficient distance between the film roll 8 and the permanently placed opposing roll 5 to smooth the folds while unwinding the portion of the tubular film 4 before contacting the opposite roll 5.

[0037] Upon completion of the wrapping operation, a portion of the portion of the tubular film 4 is unwound by the respective movement of the moving means 7. Then, the four wrappers 1 are moved away from each other and a part of the tubular film 4 is stretched in this way, as shown in FIG. 1.5 using a retracted portion of the tubular film 4 extending horizontally with respect to the wrapping mandrel 2.

The unwinding operation is not shown here, but essentially such that the opposite roller 9 is extended only when the unwinding operation is advanced - i.e. when the coil of film 8 has been exhausted to the greatest extent and therefore can be brought into operative connection with the handling means 7, while surrounding a portion of the tubular film 4. Furthermore, during the unwinding operation, the motor 6 can drive the displacement means 7 in such a way that the unwinding speed of the thus produced part of the tubular film 4 is smaller than the relative the speed of movement of the wrapping frame or wrapper 1 relative to the wrapping loads. Accordingly, during the unwinding, a portion of the tubular film 4 is extended or stretched along the load in the direction of movement of the wrapping frame. To prevent this, that a part of the tubular film 4 becomes thin and even torn during stretching, a sufficient distance is necessary between the permanently attached opposite roller 5 and the film roll 8 as already described - to smooth the folds. As a result, a portion of the tubular film 4 is fully developed before it contacts the opposite roll 5. This provides a high resistance against tearing during unwinding. If, during unwinding, intentional, and therefore desired, pleat forming in the tubular film is to be obtained, the movement of the wrapping frame or wrapper 1 can be interrupted at the right moment. The opposite roll 9 is brought into operative connection with the moving means 7 at the desired height of the film roll 8 and a corresponding portion of the film roll 8 is unwound by driving the moving means 7.

[0039] Fig. 2 shows a detail of a second embodiment of a wrapper 1 according to the invention. Unlike the first embodiment, two opposing rollers 10, 11 are slidably positioned on the wrapping rod 2, which however are displaced only slidably in the transverse direction with respect to the wrapping pin 2 and the opposing roller constant 5.

[0040] In the following description, the process according to the invention for wrapping a portion of a tubular film 4 using the second embodiment of a wrapper 1 according to the invention described above is explained in FIGS. 2.1 to 2.6.

[0041] In a similar way as the first embodiment in Fig. 1.1 is shown and described, the first portion of the tubular film 4 is lowered onto four wrapping tubes 2. Next, as shown in Fig. 2.2, assigned to each wrapping mandrel 2 the drive unit 3 it is brought into operative connection with the wrapping spindle 2. The fixed coupling point PA is thus formed in the region of the permanently mounted opposing roller 5 and the moving means 7. In this case, the portion of the tubular film 4 is in the same position with respect to the wrapping pin 2 during

-9owijania. At the same time, the two opposite rollers 10 and 11 are extended from the wrapping rod 2. Accordingly, two successive coupling points A and B are formed. However, as will be shown below, unlike the coupling point PA, these coupling points are not present in the whole process.

Furthermore, the first two opposing rollers 10, 11 are prolonged and, as shown in Fig. 2.3, the displacement means 7 are driven by means of a motor 6. Consequently, a portion of the tubular film 4 is folded into the folds at the bottom of the wrapping mandrel 2 and a film roll 8 is formed or enlarged. As soon as the upper end of the film wind 8 reaches the opposite roll 10 and consequently virtually coincides with the lowest engagement point A, the lowest opposite roll 10 is advanced or backward in a transverse direction with respect to the wrapping pin 2. As shown in Fig. 2.4, the operative connection to the lower counter roller 10 is thus removed. Consequently, the lowest coupling point A is then determined by the operative connection between the opposite roll 11 and the moving means 7,

When the upper end of the winding of the film 8 is in contact with the opposite roll 11, the opposite roll 11 is also moved in the transverse direction with respect to the wrapping pin 2, and the working connection in the region of the opposing roll 11 is removed. As shown in Fig. 2.5, the permanently mounted opposing roller 5 then determines both the fixed coupling point PA and the lowest point of engagement A, in which the movement means 7 and the wrapping pole 2 engage when the portion of the tubular film 4 is enveloped.

[0044] During the subsequent unwinding of the portion of the tubular film 4 - which extends substantially as described with respect to the first embodiment - the opposing rollers 10 and 11 are only expanded if the unwinding progress is substantially advanced. Consequently, only at the end of the unwinding, when the foil roll 8 is already depleted, there are three coupling points A, B, PA as shown in Fig. 2.6.

[0045] Fig. 3 shows a cross-section AA of the wrapper 1 shown in Fig. 2 extending along the wrapping pole 2. The wrapping knot 2 comprises a lever mechanism 12 for rotating the opposing rollers 10 and 11, which are positioned below and an opposing roller 5 permanently mounted in wrapping mandrel 2.

[0046] Fig. 4 shows a lever mechanism 12 according to the invention, which is shown in Fig. 3. The lower opposite roll 10 is placed on the wrapping rod 2 rotationally around the first rotation axis 15 by means of the first lever arm 13. The upper opposite roll 11 is placed on the wrapping rod 2 pivotably around the second rotation axis 16 by means of the second lever arm 14. The length of the lever arms 13, 14 along the rotation axis 15, 16 is so great that the distance generated by the rotation is fully sufficient to completely break the working link between

- opposing rollers 10 and 11 and means for moving 7. For rotation, the lever arms 13, 14 are moved by means of pneumatic cylinders 17, 18 assigned to them. Both lever arms 13, 14 are provided with associated springs 19, 20. The springs 19, 20 act on the lever arms 13, 14 in such a way that the opposing rollers 10, 11 are articulated to the wrapping rod 2 when the pneumatic cylinders 17, 18 they do not exert any opposite working pressure.

[0047] According to the invention, the pneumatic cylinders 17, 18 can be activated separately so that the opposing rollers 10, 11 can be rotated individually. In general, only a relatively small stroke of the cylinder is necessary. In the embodiment shown here, the cylinder pitch <5 mm is sufficient to bring about the total lateral rotation of the opposing rollers 10, 11. In order to adapt the lever mechanism 12 in the wrapping means 2 in a space-saving manner, the lever arms 13, 14 are respectively bent sideways (Figure 3).

[0048] Fig. 5 shows the details of a third embodiment of a wrapper 1 according to the invention, which is basically constructed in a similar manner to two other embodiments. However, in this embodiment the wrapping blades 2 of the wrappers 1 have, in addition to the opposing roll 5, permanently mounted on the upper wrapping rod 2, additionally permanently attached opposite roll 21. Both opposite rollers 5, 21 can be brought into operative connection with the moving means 7, while enclosing a portion of the tubular film 4, by moving the drive unit 3 or the displacement means 7. The drive unit 3 comprises a pneumatic cylinder 22, which for this purpose can move the lower return rollers 23 of the displacement means 7 along the rails.

[0049] In the following description, the method according to the invention for wrapping a portion of a tubular film 4 in a third embodiment of a wrapper 1 according to the invention is explained in FIGS. 5.1 to 5.5.

[0050] In the case of the method step shown in Fig. 5.1, a part of the tubular film 4 has already been pushed out by the wrapping rod 2, and the four wrapping tubes 2 of the wrapper 1 have been slightly spaced apart. Two oppositely fixed rollers 5, 21 of each of the wrapping tubes 2 are in contact with the inner side of the tubular film portion 4. A working connection between the drive units 3 of the wrapping tubes 2 has not yet been established.

[0051] Next, as shown in Figure 5.2, the drive unit 3 is brought into operative connection with the corresponding wrapping rod 2 while surrounding a portion of the tubular film 4. Working connection formed between the upper opposite roll 5 and the moving means 7 when the film is enveloped tubular 4, determines the fixed coupling point PA. The lowest coupling point A is formed by pressing the movement means 7, shaped as a conveyor belt, against the lower opposing roll 21 of the wrapping rod 2.

[0052] Next, the displacement means 7 are driven by the motor 6, and the wrapping process proceeds to the step shown in fig. 5.3. The portion of the tubular film 4 is here moved relative to the wrapping rod 2 and laid in the folds in the lower part of the wrapping mandrel 2. The resulting film roll 8 expands as the wrapping progress progresses until the upper end of the film roll 8 comes into contact with the opposite roll 21 as shown in Figure 5.3.

As shown in Fig. 5.4, the lower part of the displacement means 7, in this case the lower reversal roller 23 of the belt conveyor, is then pushed away from the opposing roller 21 by actuating the pneumatic cylinder 22. As a result, the working connection of the opposite opposite roller 21 and means for displacement 7 is removed. Accordingly, only the upper opposite roll 5 is in operative connection with the drive unit 3. The wrapping can be continued, but the wrapping operation ends in such a way that sufficient distance is maintained between the produced web of film 8 and the fixedly attached counter roller 5 for smoothing the folds of the tubular film part

4. The smoothing of the folds is also possible beyond the lower opposite roll 21 as the roll is not in operative connection with the means for displacement 7. As described in the first two embodiments, a portion of the tubular film portion 4 is then unrolled again before the four wrapping pins 2 wrappers 1 they will be moved away from each other and a portion of the tubular film 4 is consequently transversely extended, i.e. stretched. This state is shown in Fig. 5.4.

[0054] After stretching and for unwinding the reel of the film 8, first the lower reversing roll 23 is still held in the conveying position shown in Fig. 5.4. However, when the foil roll is reduced to the point that it no longer touches the lower opposite roll 21, the lower feed roller 7 is moved to the opposite roll 21, as shown in Fig. 5.5. Then the roll 8 is unrolled.

[0055] Also in the third embodiment, during the unwinding operation, a portion of the tubular film 4 can be stretched along the wrapping load by guiding the moving means 7 as described with respect to other embodiments. Also in this embodiment, it is possible to use fold formation, especially in the case of reinforcing the packaging of charges to be wrapped.

[0056] Fig. 6 shows a hood tucker 24 based on stretching methods and comprising a wrapper 1 according to the invention, wherein the wrapper 1 comprises four wrapping tubes 2 with correspondingly associated drive units 3. The wrapping pins 2 and the associated drive units are attached to a one piece the wrapping frame 26 by means of the fixing plates 25. As Fig. 6 shows a side view, only the wrapping bands 2 lying at the front are visible. The displacement means 3 associated with the wrapping rods 2 are covered by the fixing plates 35. The wrapping pins 2 can be displaced horizontally to stretch the portion of the tubular film 4 (not shown). For wrapping loads 27, after the wrapping operation, the wrapping frame 26 is moved vertically along the structure 28. Then, a part of the tubular film 4 is unwrapped from the wrapping rods 2 and the load 27 is packaged. The load 27 is placed on the pallet 29 and transported outside the hood liner 24 behind

The transport device 30 can be designed in such a way that it is lifted from the floor so that the pallet 29 can at least partly be wrapped with the load 27.

[0057] Fig. 7 shows a cross section BB through the hoodmaker folder 24 shown in Fig. 6, all four wrapping blades 2 and drive units 3 being shown on the wrapping frame 26 are illustrated. For stretching the wound portion of the tubular film 4, four the wrapping pins 2 are displaced by appropriately defined drive units 3 in an oblique direction as indicated by dash-dot lines. As a result, the wound portion of the tubular film 4 (not shown) extends in the X and Y directions. To adjust the package individually to a given load 27, the wrapping pins 2 and the drive units 3 can be moved individually and independently of one another.

List of reference marks [0058]

wrapper

Wrapping mandrel

Power unit

Part of the tubular film

Permanently mounted opposite rollers

Engine

Means for moving

Foil roll

Transverse and longitudinally displaceable opposite rollers

Transversely displaceable opposite rollers

Transversely displaceable opposite rollers

Lever mechanism

The first lever arm

The second lever arm

The first axis of rotation

Second axis of rotation

The first pneumatic cylinder

Second pneumatic cylinder

Spring

Spring

-13 Permanently mounted opposite rollers Pneumatic cylinder

Lower reversible roll of displacement means

Co-founder of hoods

Mounting plate

Wrapping frame

Cargo

Structure

Palette

Transport device

The lowest point of coupling

Another coupling point

Fixed coupling point