EP2336034A1 - Method and device for wrapping a stack of goods with a film - Google Patents

Abstract

The apparatus is provided with a film supply for the films (2,3), a film feeding head (4) for supplying the films and a pulling device (5) to pull the films for the stack of goods (1). The films are conveyed from the film supply to film feeding head. The film storages (15,16) are provided between the film supply and film feeding head for receiving the film. An independent claim is also included for a method for operating a wrapping apparatus.

Description

The invention relates to a device for wrapping a stack of goods with a film, with at least one film supply for the film, a Folienzuführkopf for feeding the films and a coating device for coating the film over the stack, wherein the film from the film supply to Folienzuführkopf is conveyed and wherein the Folienzuführkopf is movable in the direction of coating the film and against the coating direction of the film. Furthermore, the invention relates to a method for operating a device according to the invention. - Foil means in the context of the invention, 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, but the stack may also be products from the white area, such. As refrigerators or the like. The stack is conveniently added to a pallet.

A device of the type described above is made WO 2008/031449 A1 known. In this known device, the Folienzuführkopf is moved for maintenance in a lower position. The device has four vertical masts, between which the Folienzuführkopf is arranged and at which the Folienzuführkopf is supported during the process. The Folienzuführkopf is transported on the vertically upward and downward movable Überzieheinrichtung. At least two drive motors are required for moving the coating device on the four vertical masts, which must be synchronized in a relatively complex manner. Due to the structure with four vertical masts, this device is a complex and voluminous unit, in which the transport and installation are relatively expensive. When moving the film feeding head to a lower maintenance position, the film to be fed is removed from the film feeding head unthreaded and fenädek after returning to an upper operating position. This is expensive and time consuming. As a result, this known device is characterized by relatively high outlay in terms of its transportation, assembly and operation or maintenance.

In contrast, the invention addresses the technical problem of specifying a device of the type mentioned, are less expensive, less complicated and less time-consuming in the transport, installation, and operation and maintenance.

To solve this technical problem, the invention teaches a device of the type described above, which is characterized in that both the Folienzuführkopf and the overdrawing device are movable on only two vertical masts.
and that between the film supply and Folienzuführkopf a film storage is provided for receiving or for storing film in the process of Follenzuführkopfes in the coating direction.

According to the Folienzuführkopf is therefore moved to only two mutually parallel vertical masts. Conveniently, the two vertical masts are connected together in their upper region or at their upper ends via at least one stabilizer bar.

It is within the scope of the invention that the film storage is provided for receiving film in the process of Folienzuführkopfes in the coating direction and provided for dispensing of film in the process of Folienzuführkopfes opposite the coating direction. A preferred embodiment a film store for the device according to the invention will be explained in more detail below.

According to a particularly preferred embodiment of the invention, the film can be fed as a film tube. Empfohlenermaßen the film tube is designed as a gusseted tube. Then, the film tube in addition to two superimposed film layers expediently on each side of a fold. A preferred embodiment is characterized in that a film tube or a gusseted tube is pulled over the stack of goods as a film hood. For this purpose, welding of the film tube preferably takes place in a manner known per se.

According to a first preferred embodiment, the device according to the invention can be designed as a shrinking device for shrinking a film onto a stack of goods. Then the device expediently has a shrink frame, which is preferably movable like the coating device and as the film feeding head in coating direction of the film and against the coating direction of the film. The shrink frame is electrically heated for shrinking a film, for example. In a second preferred embodiment, the device according to the invention may also be a hood stretching device. It is then within the scope of the invention that the device has a transverse stretching device and preferably a gathering device for shirring the film. In such a device, the covering device can at the same time be used as a transverse stretching device.

It is within the scope of the invention that the film supply is a film wound into a film coil or a film tube wound into a film coil. The film or the film tube is from led the film supply through the film storage to Folienzuführkopf. It is also within the scope of the invention that the film is guided or held in the Folienzuführkopf accordingly. The at least one film supply or the at least one film coil is expediently arranged in the lower region of the device according to the invention. Preferably, the at least one film supply or the at least one film coil is arranged in the lower half of this height with respect to the height of the vertical masts.

A particularly preferred embodiment of the invention is characterized in that the Folienzuführkopf has two parallel side elements or side walls, each side member or each side wall is associated with one of the two vertical masts and is guided during the process of Folienzuführkopfes on the outside of the associated vertical mast , Outside of a vertical mast means the side facing away from the other vertical mast side of a vertical mast. Conveniently, the vertical masts are rectangular in cross section and each have an outer side, an inner side, a front side and a rear side. The inside of a vertical mast is the side of the mast facing the other vertical mast. The front of a vertical mast is the stack of goods or Folienzuführkopf facing side of the vertical mast. It is within the scope of the invention that the two side elements or side walls are arranged parallel to each other. It is also within the scope of the invention that the two side elements or side walls are arranged transversely or perpendicular or substantially perpendicular to the vertical masts.

According to a very preferred embodiment of the invention, each side member is supported or supports each side wall via at least one support element, preferably via at least one support roller on the outside of the assigned vertical mast. Preferably, each side wall of the Folienzuführkopfes a support roller, with which the side wall is supported on the outside of the associated vertical mast. The support roller is expediently partially embedded in the side wall.

A highly recommended embodiment is characterized in that each side element or that each side wall of the Folienzuführkopfes via at least two support elements, in particular via at least two support rollers on the front of the associated vertical mast is supported. Conveniently, each side member is supported or supports each side wall via only two support rollers on the front of the associated vertical mast. Preferably, each side member or each side wall of the Folienzuführkopfes supported by at least two support elements, in particular via at least two support rollers on the back of the associated vertical mast. Conveniently, each side member or each side wall only two support rollers with which the side member or the side wall of the back of the associated vertical mast is supported.

It is within the scope of the invention that the distance of an uppermost supported on the front of a vertical mast support roller to the lowermost supported on the back of this vertical mast supporting role at least 30%, preferably at least 35% of the distance between the center of the Folienzuführkopfes and of the Front of the vertical masts formed / spanned level is. Empfohlenermaßen this arrangement of the two support rollers is realized on both vertical masts. Focus refers to the mass of Folienzuführkopfes or to the mass of the components of the Folienzuführkopfes. The distance between the two support rollers is thereby from the lower edge of the uppermost support roller to the Upper edge of the lowest support roller measured. It is within the scope of the invention that the height of the side walls of the Folienzuführkopfes is adapted to the distance between the uppermost and the lowermost support roller.

It is recommended that the distance between an uppermost support roll supported on the back of a vertical mast and the lowermost support roll supported on the front of this vertical mast is at least 35%, preferably at least 45% of the distance between the center of gravity of the film feed head and that formed by the front sides of the vertical masts. spanned level. The distance between the two support rollers is measured from the lower edge of the uppermost support roller to the upper edge of the lowermost support roller. Preferably, the above-described arrangement of the two support rollers is realized on both vertical masts.

A particularly recommended embodiment of the invention is characterized in that the components of the Folienzuführkopfes are arranged exclusively outside of the intermediate space between the two vertical masts. Thus, according to this embodiment, there are no components of the Folienzuführkopfes between the two vertical masts. Preferably, only the film or only the films are passed between the two vertical masts and fed to the Folienzuführkopf. This embodiment enables the Folienzuführkopf can simply be slipped from above the vertical masts or on the connected with a stabilizing bar vertical masts during assembly of the device.

A very preferred embodiment of the invention is characterized in that the coating device, in particular when coating the film over the stack of goods perpendicular or substantially perpendicular to the two vertical masts is arranged and that the overdrawing device is pivotable about a horizontal pivot axis to the two vertical masts out. Preferably, the puller comprises two mutually parallel or substantially parallel gripping arms, which are arranged in particular when coating the film over the stack of goods perpendicular or substantially perpendicular to the two vertical masts and the pivotable about the horizontal pivot axis to the two vertical masts are. During operation of the device according to the invention, the covering device or the two gripping arms of the covering device are arranged perpendicular or substantially perpendicular to the two vertical masts or horizontally. Especially for a transport of the device, the overdrawing device or the gripper arms of the overdrawing device can then be pivoted about the horizontal pivot axis to the vertical masts. Conveniently, the gripping arms are arranged in this pivoted position parallel or substantially parallel to the two vertical masts. In the pivoted to the vertical mast condition results in a compact little voluminous aggregate, which is easily transportable. The pivotability of the puller also proves to be advantageous if the puller encounters an obstacle in their vertical downward movement, then the puller or then the gripper arms of the puller are not destroyed, but pivoted upwards, It is within the scope of the invention that the puller or that the gripping arms is only then pivotable / when a force acting on the puller or on the gripping arms minimum force is exceeded. For this purpose, the overdrawing device or the gripping arms are preferably frictionally applied to at least one contact element and pivotability is only possible if the force applied to the overstretching device or if the force acting on the gripper arms exceeds the restraining force generated by the frictional engagement.

It has been proven that at least one drive is provided for the overdrawing device and that the overdrawing device can be moved by means of this drive in the overstretching direction of the film and counter to the overstretching direction of the film. A particularly preferred embodiment of the invention is characterized in that the Folienzuführkopf by means of the drive of the coating device in the direction of coating the film and counter to the coating direction of the film is movable. It is recommended that the film feed head is not equipped with its own separate drive. Preferably, the drive for the overdrawing device is arranged in the region of the bottom on which the device according to the invention rests. Conveniently, the drive or a drive motor of the overdrawing device is connected via at least one coupling element to a covering carriage of the overdrawing device that can be moved relative to the drive in the overstretching direction or counter to the overdrawing direction. The coupling element is preferably a toothed belt.

According to a particularly recommended embodiment of the invention, the Folienzuführkopf relies in the process on the coating device and the aggregate of Folienzuführkopf and coating device is moved together in the overstretching or against the coating direction. Thus, during the process of the unit, the overdrawing device or the overdrawing carriage of the overdrawing device, as it were, carries the follicle feeding head. It is within the scope of the invention that the Überzieheinrichtung is guided and moved by means of the Überziehschlittens on both vertical masts. It is also within the scope of the invention that the unit of Folienzuführkopf and Überzieheinrichtung is moved together on the two vertical masts. The drive or drive motor for the overdrawing device or for the mentioned unit of overdrawing device and Folienzuführkopf is recommended arranged in the foot area at least one of the two masts. According to a preferred embodiment of the invention, a drive motor for the overdrawing device is arranged in the foot region of one of the two vertical masts. This drive motor is expediently connected via a coupling element guided along the vertical mast to the overdrawing device or to the overdrawing carriage of the overdrawing device. Furthermore, this drive motor is preferably connected via a shaft to a coupling element guided along the other vertical mast, which coupling element is likewise connected to the overdrawing device or to the overdrawing carriage of the overdrawing device,

A recommended embodiment of the invention is characterized in that the Folienzuführkopf has at least one safety latch, which safety pawl engages in at least one upper operating position of the Folienzuführkopfes in an upper safety recess, so that the Folienzuführkopf is maintained at the level of this upper operating position. In principle, several upper operating positions of the Folienzuführkopfes and thus several upper security recesses could be provided for the safety latch. An upper operating position of the Folienzuführkopfes is suitably arranged in the upper region or in the head region of the two said vertical masts. Then, the at least one upper safety recess in the upper region or in the head region of the two vertical masts is also arranged. It is within the scope of the invention that the at least one safety latch of the Folienzuführkopfes in at least one lower maintenance position of Folienzuführkopfes engages in a lower safety recess, so that the Folienzuführkopf is maintained at the level of this lower maintenance position. It is also within the scope of the invention that the at least one maintenance position of the Folienzuführkopfes is arranged in the region of the lower end of the vertical masts. Both Safety recesses are preferably recesses introduced into the masts. Preferably, the Folienzuführkopf on two safety pawls, which are advantageously arranged on the opposite side walls of the Folienzuführkopfes. It is recommended that each of the two safety pawls is assigned to one of the two vertical masts and expediently safety recesses are provided for each safety pawl in each of the two vertical masts. Preferably, two safety recesses in the upper region or in the head region of the two vertical masts are arranged at the same height and associated with an upper operating position of the Folienzuführkopfes. Empfohlenermaßen two safety recesses in the lower region or in the footer of the two vertical masts are arranged at the same height and these two safety recesses are assigned to a lower maintenance position of the Folienzuführkopfes.

A proven embodiment of the invention is characterized in that the at least one safety pawl of Folienzuführkopfes part of a fall protection device of Folienzuführkopfes and that the at least one safety pawl engages in a Fallicherungsausnehmung an unrestrained sliding down the Folienzuführkopfes. Such an unrestrained sliding down or such a "free fall" of Folienzuführkopfes may occur in particular when the coupling element between the drive of the overdrawing device and the Überziehschlitten the coating device tears. Appropriately, a plurality of Fallicherungsausnehmungen is distributed over the height of the mast on at least one of the two vertical masts. In this case, the Fallicherungsausnehmungen can have a smaller depth than the above-mentioned safety recesses for the specific positions of the Folienzuführkopfes because the Fallicherungsausnehmungen only as an abutment for the Safety catch to catch the Folienzuführkopfes in "free fall" serve. According to a preferred embodiment, the at least one safety latch is rotatable under the weight of the Folienzuführkopfes to an associated vertical mast, so that the safety pawl can functionally secure in a safety recess or a Fallicherungsausnehmung this mast. It is recommended that the fall-protection device has at least one damping device with which, in particular, the shock occurring when the safety pawl engages in a fall-securing recess can be damped. Appropriately, for this purpose, the safety pawl is movable over a path in the vertical direction and the safety pawl acts for damping preferably with an elastic material, in particular with a rubber buffer together. It is moreover also within the scope of the invention that the covering device or the covering carriage of the covering device is equipped with a fall securing device.

A recommended embodiment of the invention is characterized in that the film memory has two deflection rollers for the film and a dancer roller for the film, wherein the distance of the dancer roller to the guide rollers is variable and wherein by varying this distance, the stored in the film storage film amount is adjustable , Conveniently, the two guide rollers are arranged stationary and preferably arranged at the same height or approximately at the same height. It is within the scope of the invention that the film supplied from the film supply is deflected by a first guide roller, then fed in a first direction of the dancer roller, is guided around the dancer roller and then discharged again in a second direction and deflected by the second guide roller , Conveniently, the second direction is opposite to the first direction. By varying or increasing the distance or the vertical distance of the dancer roller to the guide rollers, the stored Film quantity also be increased. It is within the scope of the invention that the distance between the dancer roller and the two deflection rollers arranged at the same height or approximately at the same height corresponds to half or approximately half of the amount of film or film length received in the storage space.

A particular embodiment of the invention is characterized in that a first film supply is provided for a first film and a second film supply for a second film, wherein the film supply head is adapted for selectively feeding the first film or the second film,
wherein between the first sheet supply and the Folienzuführkopf a first film storage for receiving or storing the first film in the process of Folienzuführkopfes is provided and wherein between the second film supply and the Folienzuführkopf a second film storage for receiving or storing the second film in the process of Folienzuführkopfes provided is. Preferably, both films are fed between the two vertical masts through the Folienzuführkopf.

It is within the scope of the invention that the first film and the second film are different films which differ in particular with respect to their film format (film dimensions) and / or their film thickness and / or their film material. According to a preferred embodiment of the invention, both the first and the second film is supplied as a film tube and in particular as a gusseted tube. The two foil stocks are expediently foils or foil tubes wound into foil coils. The first and the second film stores may have the features explained above for the film store. The Folienzuführkopf preferably has facilities with which optionally the first film or the second sheet can be fed. The coating device is then provided for coating the first film or the second film.

The invention also relates to a method for operating a device according to the invention, wherein film is conveyed from at least one supply of film to a Folienzuführkopf, wherein the supplied from the Folienzuführkopf film is drawn with a Überzieheinrichtung on a stack, wherein for servicing or repair of the device Folienzuführkopf is moved in Überziehrichtung the film in a maintenance position and wherein in this method of Folienzuführkopfes film is recorded or stored in a arranged between the film supply and Folienzuführkopf film storage. Preferably, the Folienzuführkopf is moved by means of the drive of the coating device and it is within the scope of the invention that the Folienzufiührkopf has no separate or own drive / drive motor. Empfohlenermaßen the Folienzuführkopf is supported / supported in the process in coating or against the Überziehrichtung of Überzieheinrichtung or by the Überziehschlitten the coating device.

The invention is based first of the recognition that the device according to the invention can be transported in a simple and space-saving manner and mounted in a simple and rapid manner. The fact that the device according to the invention has only two vertical masts for supporting the Folienzuführkopfes and the overdrawing device, it takes in the horizontal transport state only a relatively small volume and can be transported in a space-saving manner. Furthermore, during assembly of the device, the film feeding head and coating device can be slipped over the only two vertical masts in a simple and compulsory manner. Due to the fact that the Folienzuführkopf for a process is set up on the two vertical masts, the mounting of this Folienzuführkopfes on the two vertical masts can be done in a very simple manner. Furthermore, the guide on only two vertical masts allows a simplification of the drive for the Folienzuführkopf or for the overdrawing device and in particular a simplification of the control and synchronization of this drive. The invention is further based on the finding that the Folienzuführkopf can be moved particularly trouble-free and compulsory on only two vertical masts with his compared to the overdrawing device relatively high weight. In addition, the mobility of the Folienzuführkopfes requires that the maintenance and repair of the device with relatively little effort or time required. The critical system components are relatively easily accessible in the device according to the invention. In contrast to many other known devices, the effort in connection with Steigleitem, running platforms and the like can be kept low. The device according to the invention is relatively simple and not very complex. Thus, it can be realized even with relatively low production costs.

Fig. 1

eine Seitenansicht einer erfindungsgemäßen Vorrichtung in einer ersten Funktionsstellung,

Fig. 2

einen vergrößerten Ausschnitt A aus Fig. 1,

Fig. 3

den Gegenstand nach Fig. 1 in einer zweiten Funktionsstellung,

Fig. 4

den Gegenstand gemäß Fig. 2 in der zweiten Funktionsstellung,

Fig. 5

eine perspektivische Darstellung einer erfindungsgemäßen Vorrichtung,

Fig. 6

einen vergrößerten Ausschnitt aus Fig. 1 in einer weiteren Funktionsstellung,

Fig. 7

eine perspektivische Darstellung einer erfindungsgemäßen Sicherheitsklinkeneinrichtung mit Sicherheitsklinke,

Fig. 8

eine perspektivische Darstellung eines erfindungsgemäßen Folienzuführkopfes und

Fig. 9

eine perspektivische Darstellung der Überzieheinrichtung.

The invention will be explained in more detail below with reference to a drawing, which shows only an exemplary embodiment, in which:

Fig. 1

a side view of a device according to the invention in a first functional position,

Fig. 2

an enlarged section A from Fig. 1 .

Fig. 3

the object after Fig. 1 in a second functional position,

Fig. 4

the object according to Fig. 2 in the second functional position,

Fig. 5

a perspective view of a device according to the invention,

Fig. 6

an enlarged section Fig. 1 in another functional position,

Fig. 7

a perspective view of a safety latch device according to the invention with safety latch,

Fig. 8

a perspective view of a Folienzuführkopfes invention and

Fig. 9

a perspective view of the overdrawing device.

The apparatus is equipped with a Folienzuführkopf 4 for feeding the film 2, 3 and with a coating device 5 for subsequent coating of the film 2, 3 on the stack 1. According to the invention, the film feeding head 4 can be moved in the direction of coating the film 2, 3 and against the coating direction of the film 2, 3, namely on only two vertical masts 6, 7. For this purpose, the film feeding head 4 expediently has a film feeding carriage 8 which is mounted on both vertical masts 6, 7 in the process of Folienzuführkopfes 4 is performed in more detail below. It is within the scope of the invention that the overdrawing device 5 is moved with a pull-on slide 9 on the two vertical masts 6, 7 and the pull-on slide 9 at both vertical Masts 6, 7 is performed. The overdrawing device 5 further comprises two gripping arms 35 for coating the film 2, 3.

In the exemplary embodiment, the apparatus has a first film supply in the form of a first film coil 13 for a first film 2 and a second film supply in the form of a second film coil 14 for a second film 3. The first film 2 can be fed from the first film coil 13 to the film feed head 4 and the second film 3 can also be supplied to the Folienzuführkopf 4 from the second Foliencoil 14. For this purpose, the films 2, 3 between the two vertical masts 6, 7 can be fed to the Folienzuführkopf 4. The Folienzuführkopf 4 is preferably and in the embodiment for selectively feeding the first film 2 or the second film 3 set. For example, the first film 2 and the second film 3 may differ in their size or thickness. Between the first Foliencoil 13 and the Folienzuführkopf 4, a first film memory 15 for receiving or storing the first film 2 in the process of Folienzuführkopfes 4 is provided. Between the second film coil 14 and the Folienzuführkopf 4, a second film memory 16 for receiving or storing the second film 3 in the process of Folienzuführkopfes 4 is provided.

The two film stores 15, 16 are preferred and constructed in the exemplary embodiment as explained below. Each film storage 15, 16 has two stationary and preferably arranged at the same height deflection rollers 17, 18 for the film 2, 3. Furthermore, each film store 15, 16 has a dancer roller 19 that is movable relative to the guide rollers 17, 18. The dancer rollers 19 are in the embodiment in each case in a guide 20 vertically movable or movable. In this way, the respective distance between the dancer roller 19 to the guide rollers 17, 18 is variable and by this variation of the distance is recorded in the respective film memory 15, 16 or stored Film quantity / film length adjustable. In the functional position of Fig. 1 and 2 is the Folienzuführkopf 4 in an upper operating position on the two vertical masts 6, 7. In this functional position, the two dancer rollers 19 have only a very small distance to the guide rollers 17, 18 and stored in the Folienspeichem 15, 16 amount of film is low or hardly worth mentioning. In the functional position after the Fig. 3 and 4 the Folienzuführkopf 4 is arranged in a lower maintenance position in the lower region of the vertical masts 6, 7. In this functional position, the dancer rollers 19 have a relatively large distance from the respective associated guide rollers 17, 18 and a correspondingly large amount of film of the first film 2 and the second film 3 is stored or recorded in the film stores 15, 16. It is within the scope of the invention that in the process of Folienzuführkopfes 4 in coating direction of the film or vertically from top to bottom and the distance between the dancer roller 19 to the guide rollers 17, 18 is changed continuously and thus successively an increasing amount of film from Folienspeichem 15, 16 is recorded. It is understood that the film storage 15, 16 for receiving film 2, 3 in the process of Folienzuführkopfes 4 in Überziehrichtung and the corresponding dispensing of film 2, 3 are provided in the process of Folienzuführkopfes 4 against the coating direction. In the process of Folienzuführkopfes 4 against the coating direction so stored in the Folienspeichem 15, 16 stored film is discharged again and the dancer rollers 19 move in the direction of guide rollers 17, 18th

Preferably and in the exemplary embodiment, a drive motor 21 is provided for the pull-over device 5 or for the pull-on slide 9. This drive motor 21 may be an electric motor. The drive motor 21 is arranged in the bottom region of the device and expediently and in the exemplary embodiment at the foot of a vertical mast 6, 7. The Drive motor 21 is connected via a englang of the vertical mast 6 guided coupling element in the form of a toothed belt 22 to the over-carriage 9 of the overdrawing device 5. Furthermore, the drive motor 21 is coupled via a shaft, not shown, with a guided along the second vertical mast 7 coupling element in the form of a toothed belt 22. With the help of only one drive motor 21 so can the over-pulling device 5 with the guided on the vertical masts 6, 7 over-carriage 9 in coating direction of the film 2, 3 or against the coating direction of the film 2, 3 are moved. Empfohlenermaßen and in the embodiment, the Folienzuführkopf 4 does not have its own drive and this Folienzuführkopf 4 can only be moved by means of the drive or by means of the drive motor 21 of the overdrawing 5. In the exemplary embodiment, the film feed head 4 is supported during the process along the vertical masts 6, 7 on the coating device 5 or on the over-drawing carriage 9 of the coating device 5. The unit of Folienzuführkopf 4 and coating device 5 is thus moved together in the coating direction of the film 2, 3 or against the coating direction. The coating device 5 or the pull-on slide 9, as it were, supports the film feed head during the process in the vertical direction. When the sheet feeding head 4 is in an upper operating position ( Fig. 1 ) is moved to the process of Folienzuführkopfes 4 down first of the overdrawing carriage 9 of the overdrawing 5 from below to the Folienzuführkopf 4. As a result, a safety pawl device 23 of the film feed head 4, which will be described below, is released and the film feed head 4 can then be carried by the puller 5 vertically downwards into a lower maintenance position (FIG. Fig. 3 ). Due to the mobility of the Folienzuführkopfes 4 in a lower maintenance position and also by the arrangement of the drive motor 21 in the bottom region of the device, these components are optimally accessible for maintenance and repair work. The order The drive motor 21 in the foot region of the vertical mast 6 and the non-driven design of the Folienzuführkopfes also require an advantageous relatively low weight of Folienzuführkopfes 4 and the unit of Folienzuführkopf 4 and overdrawing. 5

Especially in the Fig. 5 and 8th It can be seen that the Folienzuführkopf 4 has two mutually parallel side walls 10, which are expediently and in the embodiment perpendicular to the two vertical masts 6, 7 are arranged. Between the two side walls 10, substantially the remaining components of the Folienzuführkopfes 4 are added. The arranged on the outside of the vertical masts 6, 7 two side wall portions of the two side walls 10 are connected to each other and this aggregate forms as it were the Folienzuführschlitten 8. Der Fig. 8 can be taken that each side wall 10 via a support roller 11 on the outer side 12 of the associated vertical mast 6, 7 is supported. Preferably, and in the embodiment, a support roller 11 is partially embedded in the associated side wall 10. Each side wall 10 of the Folienzuführkopfes 4 is further supported by two spaced-apart support rollers 36 on the front side 37 of the associated vertical mast 6, 7 from. The distance between these two support rollers 36 is preferably at least 30% of the distance between the center of gravity of the Folienzuführkopfes 4 and of the front sides 37 of the vertical masts 6, 7 plane spanned. Each side wall 10 of the Folienzuführkopfes 4 is also supported via two support rollers 38 on the back 39 of the associated vertical mast 6, 7 from. The distance between these support rollers 38 is preferably at least 35% of the distance between the center of gravity of the Folienzuführkopfes 4 and of the front sides of the vertical masts 6, 7 plane spanned. It can be seen that the height of the side walls 10 in the region of the vertical masts 6, 7 or in the region of the support rollers 11, 36, 38 is greater or clear This allows a correspondingly large distance between the support rollers 36 and between the support rollers 38. It should be noted, moreover, that the components of Folienzuführkopfes 4 exclusively outside the between the two vertical masts 6, 7 existing intermediate space are arranged. Only the films 2, 3 are fed between the vertical masts 6, 7 through the Folienzuführkopf 4.

Appropriately, and in the embodiment of Folienzuführkopf 4 is equipped with two safety pawls 23, each having a safety pawl 24. The safety pawls 23 are arranged on the opposite side walls 10 of the Folienzuführkopfes 4 and each associated with one of the vertical masts 6, 7. Such a safety latch device is in the Fig. 7 shown in perspective. In an upper operating position of the Folienzuführkopfes 4 ( Fig. 1 ) holds each of the two safety pawls 24 in an upper safety recess 25, wherein in the upper region of each vertical mast 6, 7 each such upper safety recess 25 is inserted into the mast 6, 7. Upon engagement of the safety latch 24 in an associated safety recess 25, the safety latch 24 is acted upon by a pneumatic cylinder 26. By means of a notch 27 provided in the safety catch 24, the safety catch 24 can be caught in the associated safety recess 25 and accidental removal of the safety catch 24 from the associated safety recess 25 is prevented. In addition, the safety latch 24 is held by the weight of the Folienzuführkopfes 4 in its secured position, since it is thereby rotated about the rotation axis 28 in the direction of the safety recess 25 of a vertical mast 6, 7. Over-tightening the safety latch 24 is expediently and in Embodiment prevented by a stop 29, which applies to the respective vertical mast 6, 7. As already explained above, the film feed head 4 is in a lower maintenance position (FIG. Fig. 3 ) movable vertically. In this lower maintenance position, the two safety pawls 24 of the Folienzuführkopfes 4 correspondingly engage in two lower security recesses, not shown, which are each introduced into one of the two vertical masts 6, 7. The bordering or introduction of the safety pawls 24 in these lower safety recesses is carried out as described above in connection with the upper safety recesses 25.

Empfohlenermaßen and in the embodiment, the safety pawls 23 of the Folienzuführkopfes 4 are also formed as a fall-protection devices for the Folienzuführkopf 4. In particular, when tearing the toothed belt 22 of the coating device 5, it could lead to an unchecked case of Folienzuführkopfes 4. The preventive Fallsicherungsausnehmungen 30, which are distributed over the vertical height of each vertical mast 6, 7 and associated with the safety pawls 24. In the case of Folienzuführkopfes 4 form the Fallicherungsausnehmungen 30 along the vertical masts 6, 7 abutment for the two safety pawls 24 and the safety pawls 24 can each be supported with its outer tip 31 in a Fallsicherungsausnehmung 30, so that the free fall of Folienzuführkopfes 4 almost immediately is slowed down. The Fallicherungsausnehmungen 30 need not necessarily have the depth of the above-described safety recesses 25 and in particular must not be introduced into the masts 6, 7. Appropriately, and in the embodiment, an index bar 32 is welded to each mast 6, 7, in which the Fallicherungsausnehmungen 30 are introduced.

Preferably and in the exemplary embodiment, the safety pawl device 23 or the fall-protection device has a damping device with which the impact occurring when the respective safety pawl 24 engages in a fall-securing recess 30 is damped. For this purpose, the aggregate of safety pawl 24, pneumatic cylinder 26 and bearing block assembly 33 via a short path relative to the rest of the safety pawl device 23 in particular vertically movable. In this case, this movement is damped by elastic elements or in the embodiment by rubber buffer 34. The vertical movement of the assembly of safety pawl 24, pneumatic cylinder 26 and bearing block assembly 33 is in Fig. 7 indicated by a corresponding double arrow.

The Fig. 9 can be removed that preferred and in the embodiment, the overdrawing 5 and the gripper arms 35 of the overdrawing 5 is pivotable about a horizontal pivot axis to the two vertical masts 6. 7 towards / are. In the operating state of the device or in particular when coating the film 2, 3, the overdrawing device 5 is arranged perpendicular to the two vertical masts 6, 7. For the transport of the device, the gripping arms 35 are recommended to be pivoted into a position in which they are arranged parallel or substantially parallel to the two vertical masts 6, 7. The pivoting of the gripping arms 35 has also proved to be advantageous when the gripping arms 35 encounter an obstacle in a downward movement. Then there is no destruction of the gripping arms 35, but only a pivoting of the gripping arms 35 upwards. It is also within the scope of the invention that the gripping arms 36 are only pivotable when a force acting on the gripper arms 35 minimum force is exceeded. Preferably, and in the exemplary embodiment, the gripping arms 35 are frictionally engaged with abutment elements 40 and can be pivoted The gripping arms 35 is only possible if the force acting on the gripper arms 35 force is greater than the restraining force generated by the frictional engagement.

Claims (15)

Device for wrapping a product stack (1) with a film (2, 3), having at least one film supply for the film (2, 3), a film feed head (4) for feeding the film (2, 3) and with a coating device ( 5) for pulling the film (2, 3) over the stack (1), wherein the film (2, 3) from the film supply to Folienzuführkopf (4) is conveyed, wherein the Folienzuführkopf (4) in Überziehrichtung the film (2, 3) and counter to the coating direction of the film (2, 3) is movable, characterized in that between the film supply and Folienzuführkopf (4) a film memory (15, 16) for receiving or storing film (2, 3) in the process of Folienzuführkopfes (4) is provided and that both the Folienzuführkopf (4) and the overdrawing device (5) on only two vertical masts (6, 7) are movable. Apparatus according to claim 1, characterized in that the film store (15, 18) for receiving film (2, 3) in the process of Folienzuführkopfes (4) in Überziehrichtung and for delivering film (2, 3) in the process of Folienzuführkopfes (4 ) is provided opposite to the coating direction. Device according to one of claims 1 or 2, characterized in that the Folienzuführkopf (4) has two parallel side elements or side walls (10), wherein each side member or each side wall (10) associated with one of the two vertical masts (6, 7) is and during the process of Folienzuführkopfes (4) on the outer wall (12) of the associated vertical mast (6, 7) is guided along. Apparatus according to claim 3, characterized in that each side member or, each side wall (10) via at least one support element, preferably via at least one support roller (11) on the outer side (12) of the associated vertical mast (6, 7) is supported. Device according to one of claims 3 or 4, characterized in that each side member or each side wall (10) via at least one support element, in particular via at least one Abstützrofle (36) and preferably via at least two support elements, in particular via at least two support rollers (36 ) is supported on the front side (37) of the associated vertical mast (6, 7). Device according to one of claims 3 to 5, characterized in that each side element or each side wall (10) via at least one support element, in particular via at least one support roller (38) and preferably at least two support elements, in particular via at least two support rollers (38 ) is supported on the rear side (39) of the associated vertical mast (6, 7). Device according to one of claims 3 to 6, characterized in that the distance of the uppermost on the front side (37) of a vertical mast (6, 7) supported support member or the distance of the uppermost at the front (37) of a vertical mast (6 , 7) supported support roller (36) to the lowest on the back (39) of this vertical mast (6, 7) supported support member or to the lowermost on the back (39) of this vertical mast (6, 7) supported support roller (36 ) At least 30%, preferably before at least 40% of the distance between the center of gravity of the Folienzuführkopfes and of the front sides (37) of the vertical masts (6, 7) spanned plane. Device according to one of claims 3 to 7, characterized in that the distance of the uppermost on the back (39) of a vertical mast (6, 7) supported support member or the distance of the uppermost at the back (39) of a vertical mast (6 , 7) supported support roller (38) to the lowermost at the front (37) of this vertical mast (6, 7) supported support member or to the lowermost at the front (37) of this vertical mast (6, 7) supported support roller (38 ) amounts to at least 35%, preferably at least 45% of the distance between the center of gravity of the Folienzuführkopfes (4) and of the front sides (37) of the vertical masts (6, 7) plane spanned. Device according to one of claims 1 to 8, characterized in that the components of the Folienzuführkopfes (4) outside the between the two vertical masts (6, 7) are provided intermediate space. Device according to one of claims 1 to 9, characterized in that at least one drive for the overdrawing device (5) is provided, wherein the overdrawing device (5) by means of the drive in the overstretching direction or against the coating direction is movable and wherein also the Folienzuführkopf (4 ) by means of the drive of the overdrawing device (5) is movable. Device according to one of claims 1 to 10, characterized in that the Folienzuführkopf (4) during the process on the overdrawing device (5) is supported and wherein the aggregate of Folienzuführkopf (4) and overdrawing device (5) together in the overstretching direction or against the coating direction is movable. Device according to one of claims 1 to 11, characterized in that the film memory (15, 16) has two guide rollers (17, 18) for the film (2, 3) and a dancer roller (19) for the film (2, 3), wherein the distance of the dancer roller (19) to the guide rollers (17,18) is variable and wherein by varying this distance, the stored amount of film is adjustable. Device according to one of claims 1 to 12, characterized in that a first film supply for a first film (2) and a second film supply for a second film (3) is provided, wherein the Folienzuführkopf (4) for selectively feeding the first film ( 2) or the second film (3), wherein between the first film supply and the Folienzuführkopf (4) a first film memory (15) for receiving or storing the first film (2) in the process of Folienzuführkopfes (4) is provided and wherein between the second sheet supply and the Folienzuführkopf (4) a second film storage (16) for receiving or storing the second film (3) in the process of Folienzuführkopfes (4) is provided. Device according to one of claims 1 to 13, characterized in that the coating device (5) during the coating of the film (2, 3) over the stack (1) perpendicular or substantially perpendicular to the two vertical poles (6, 7) is and that the overdrawing device (5) is pivotable about a horizontal pivot axis to the two vertical masts (6, 7) out. Method for operating a device according to one of claims 1 to 14, wherein film (2, 3) is conveyed from at least one supply of film to a film feeding head (4), wherein the film supplied by the film feeding head (4) is transferred by means of a coating device (5) a good stack (1) is pulled, wherein, to maintain the device, the film feeding head (4) is moved in the overstretching direction of the film (2, 3) into a maintenance position, characterized is that in this process the Folienzuführkopfes (4) film (2, 3) arranged in a film supply between Folienzuführkopf and (4) film memory (15, 16) recorded or saved.

Images