EP0853579A1

EP0853579A1 - Automatic wrapping machine with automatic change of wrapping material

Info

Publication number: EP0853579A1
Application number: EP96933413A
Authority: EP
Inventors: Joachim Colsman
Original assignee: Colsman und Kirschner GmbH and Co KG
Current assignee: Colsman und Kirschner GmbH and Co KG
Priority date: 1995-09-30
Filing date: 1996-09-27
Publication date: 1998-07-22
Anticipated expiration: 2016-09-27
Also published as: DE59603996D1; DE29515605U1; EP0853579B1; WO1997012809A1

Abstract

The invention concerns an automatic wrapping machine which comprises on opposite side flanges (1) magazines (2) in which slides (24) with a plurality of pairs of supply rolls (3, 4) can be moved into various operating positions in which one supply roll pair in each case is prepared for wrapping. The pairs of supply rolls contain wrapping material of various web widths for wrapping objects of different sizes. In this operating position, owing to a downward movement of one of the supply rolls (4) or a gripper device (41), a curtain (12) of wrapping material is tensioned between a connection and cutting device (13) and a support table (5) for the object to be wrapped. In order to form a compensating loop (23), the curtain is laid about a compensating roller (16) mounted in compensating guides (17) so as to pivot at the side flanges (1).

Description

Automatic packaging machine with automatic change of

Packaging material Technical field

The invention relates to an automatic packaging machine comprising a support table for supporting an object to be packaged, a magazine with a slide which can be moved between different working positions in a controlled manner relative to the support table and which contains a plurality of rotatably mounted supply rolls of packaging material of different widths, wherein in each working position of the slide, a curtain of packaging material can be unwound from a selected supply roll, which is adapted to the dimensions of the object to be packed, a connecting and cutting device between the curtain and the support table, a controllable device by means of which the curtain can be stretched between the connecting and cutting device and the support table, and a single tension regulating device for the curtain.

Automatic packaging machines of this type are used for packaging objects such as fabric bales or rolls in smooth foils, composite foils, ribbon fabric, paper and other sheet-like packaging material, which is pulled off a supply roll in a curtain in front of the support table. The object to be packed is moved onto the support table, taking the curtain with it, whereby it is almost completely covered by the packaging material. The tension regulating device responds to the tension exerted on the curtain during the packing process and ensures that a sufficient amount of the packaging material is always supplied or made available for the packing process. Underlying state of the art

Such automatic packaging machines are used for the packaging of objects of different lengths, so that for each object to be packed a supply roll with packaging material of the appropriate width must be provided. A known packaging machine of this type (US Pat. No. 4,905,457) contains a horizontal support for a movable carriage on both sides above the support table, which carries three supply rolls for different widths of the packaging material. The supply rolls are rotatably mounted and connected to drive rolls, upon actuation of which packaging material is unwound from a selected supply roll. While one of two supply rolls is selected by swiveling a guide plate, the third supply roll is brought into its working position by moving the carriage.

The unwound web of the packaging material is introduced into a guide part of a welding and separating device which moves downward with the unwound web and thereby introduces the free end of the unwound web into a pulling device. After the pulling device has been actuated, the welding and cutting device is moved back into its upper position and a pivotable tension-regulating device is actuated, with which a loop is formed in the unwound web. The packaging machine is then ready for packaging the respective object, which is loaded from a loading table against the hanging web of packaging material and taking the web with it in the usual way onto the support table. The packaging machine is controlled in its entire workflow starting with the measurement of the length of the object to be packed. When changing the unused part of the web which hangs from the packaged object is cut off and discarded from the supply reels, while the remainder hanging from the supply reel is rewound before the new supply reel is put into operation.

A similar device is known from DE-OS 25 06 932. The supply rolls are firmly arranged therein and the webs unwound from the respective supply rolls are guided separately from one another through a portal, from which they hang down to the packaging point. The web selected depending on the length of the object to be packaged is handled by the respective supply roll; Excess residues are collected and discarded.

In another known packaging machine (AT-PS 387 758), supply rolls are arranged in pairs in a frame at a distance, a web of packaging material being stretched horizontally or vertically between the supply rolls in accordance with the dimensions of the object to be packaged. The pairs of supply rolls can each be moved in slides, so that the webs running between the supply rolls can be arranged in front of the article to be packaged. The webs of packaging material are welded in the middle between the supply rolls and separated from the packaged item.

In another packaging machine, in which the welding and separation is also carried out centrally, supply rolls with packaging material of different widths are arranged above and below the object to be packaged. The packaging material is unwound from the selected supply rolls and fed to a welding and separating device by conveyor belts and a film take-off (DE-Gbm 93 11 290). Although the last two packaging machines mentioned largely reduce the generation of waste from the packaging material, they have the disadvantage of requiring considerable space due to the special arrangement of the supply rolls.

In the case of the packaging machine of the type mentioned at the beginning, special guide means must be provided in order to feed the loosely hanging ends of the webs of packaging material to the packaging point and to stretch the web in front of the object to be packaged; the unused parts of the webs are discarded.

In another known packaging machine similar to the one mentioned at the beginning (DE-OS 23 58 389), differently designed gripping devices are used as curtain-forming means in order to grip the free end of packaging material that comes down from a supply roll hangs and is fed to a selection device. The gripper devices are then moved from an upper position near the selection device into a lower position in order to open a curtain of packaging material in front of the support table. The gripper devices either themselves store a sufficient amount of the packaging material for the packaging of the respective object or discharge it into a storage chamber from which it is removed for carrying out the packaging process.

With this packaging machine, it is necessary to move the gripper devices back and forth for each packaging operation between the upper and lower positions and a part of the packaging material for each one

Transport the packaging process into a lower layer. Disclosure of the invention

The object of the invention is to create a packaging machine of the type mentioned in a space-saving manner which requires a minimum of controlled work processes for the individual packaging processes and does not require any waste or only small amounts of waste which are easy to dispose of generated from the packaging material.

According to the invention, this object is achieved in that the controllable device contains a curtain-forming means which is adjustable between a first and a second position, and in that the curtain-forming means is arranged in its first position in the carriage and the selected, controlled, rotatable Supply roller is assigned and that in the second position of the curtain-forming means, the curtain is stretched between the connecting and cutting device and the support table.

In the packaging machine designed in this way, a space-saving arrangement is created in that the curtain-forming means and the supply rolls are arranged together on a carriage. The curtain of the packaging material is produced directly by the adjustment of the curtain-forming means, so that no special devices for guiding and clamping the free end of the packaging material hanging down from the supply roll are necessary and the entire curtain formation is automatically controlled without further ado can.

The curtain-forming means is advantageously formed by a further supply roll. Such a further supply role is assigned to each supply role. In this embodiment of the packaging machine according to the invention, which moves the supply roll and the further supply roll together with the carriage, and the curtain is essentially unwound from the further supply roll. This makes it easy to control the packaging process; in this embodiment, the additional supply roll for each packaging process has to be moved back and forth between the first and second positions, but a waste-free packaging process is implemented for this.

In a further advantageous embodiment of the packaging machine, the curtain-forming means is formed by a gripper device, expediently a pair of squeeze rollers, the curtain being unwound solely from the supply roll selected by the working position of the carriage. It can thereby be achieved that, after actuation of the gripper device, a larger number of objects of the same dimensions can be packed one after the other without the gripper device having to be moved back from its second position into the first position. Furthermore, only one supply roll is required in this automatic packaging machine for a certain width of the packaging material, so that a larger number of supply rolls are accommodated and a larger number of different web widths are made available for a given slide size. There is only one connecting seam on the packaged item, the waste of unused packaging material being reduced to a minimum.

Advantageous further developments of the invention are identified in the subclaims.

Exemplary embodiments of the invention are shown in the illustrations and are explained and described in detail below using the reference symbols. In the same Parts designed in this way are provided with the same reference symbols.

Brief description of the drawings

FIG. 1 shows a cross-sectional view from the inside of a first exemplary embodiment of the packaging machine according to the invention;

Figure 2 shows a broken, partially sectioned view of the magazine in the packaging machine of Figure 1;

FIG. 3 is a cross-sectional view of a second exemplary embodiment of the packaging machine according to the invention from the inside, similar to FIG. 1; and

FIG. 4 is a broken, partially cut view of the magazine in the packaging machine according to FIG. 3.

Preferred embodiments of the invention

FIG. 1 shows a cross-sectional view of a first exemplary embodiment of the packaging machine, only the components which are essential in connection with the invention being shown; the view in FIG. 1 is directed towards the inside of one of two side walls 1, which form part of a frame of the packaging machine.

One can see in the upper part of the side cheek 1 a magazine 2 with, for example, three pairs arranged side by side of supply rolls 3 and 4, the arrangement of which is explained in more detail below in connection with FIG. The supply rolls 3, 4 contain wound packaging material of a respectively preselected web width, which is adapted to the dimensions of an object to be packed, which is located on a support table 5, which is only indicated schematically. The web width can be chosen so that the object is packed not only along its circumference, but also on the end faces. A first supply roll 3 rests on a drive roller 6 and is rotatably supported at its opposite ends by means of its shaft journals 29 (FIG. 2). Another or second supply roll 4 is freely rotatably supported at its opposite ends by means of its shaft journals 31 (FIG. 2). The further supply roll 4 is held in the upper position shown by a lock, which is explained further below in connection with FIG. 2.

In a second or lower position of the further supply roll 4, their shaft journals 31 are each located in a prism receptacle 7 known per se, which contains a carrier 8 with a roller guide 9 with which the respective shaft journal 31 on a guide 10 on the associated side ¬ tenwange 1 of the packaging machine is guided vertically movable. The lower end of the guide 10 is below the support table 5, which is only indicated schematically, for the object to be packaged. At the lower end of the guide 10 there is a drive roller 11 which touches the further supply roll 4 tangentially in its second or lower position. On the side of the guide 10 opposite the support table 5, there may be a support table (not shown) which takes over the object to be packaged from a conveying device and is arranged such that it can be tilted so as not to impede the vertical movement of the further supply roll 4. The further one The supply roll 4 represents a curtain-forming means in which, when it moves downward, a web of packaging material is stretched out as a curtain 12 in front of a connecting and cutting device 13. Between the guide 10 and the support table 5 there is a fixed part 14 of the connecting and cutting device 13, the movable part 15 of which is guided vertically above the fixed part 14 in the side walls 1 of the packaging machine. The connecting and cutting device 13 is designed in a conventional manner and contains, for example, two welding or adhesive bars and between them a movable knife, which cooperate in a known manner in such a way that after wrapping the object to be packaged, the web material is welded or glued and the covering is separated from the curtain 12, the curtain 12, which runs between the supply rolls 3 and 4, being maintained.

In the exemplary embodiment shown, a tension-regulating device in the form of a dancer roller 16 is arranged between the magazine 2 for the supply rollers 3, 4 and the movable part 15 of the connecting and cutting device 13, the shaft ends of which in dancer roller guides 17 on the respective side cheeks 1 are mounted on wheels. In the embodiment shown, the dancer roller guide 17 is arranged such that it is assigned to the working position of the further supply roll 4. A first end 18 of the dancer roller guides 17 is then located from the left in FIG. 1 in front of the guide 10 for the further supply roll 4, while a second end 19 of the dancer roller guides 17 is located above the packaging machine of the movable part 15 of the connecting and cutting device 13. Between the ends 18, 19, 17 deflection rollers 20, 21 are attached above and below the dancer roller guides. The dancer rolls Guides 17 are provided at the first end 18, at the second end 19 and between the ends 14, 15 with stops (not shown) for the ends of the dancer roller 16. The stop located between the ends is designed as a retractable stop which can be retracted by means of the control of the packaging machine. The stops can be designed as limit switches which emit corresponding position signals to the control of the packaging machine when the ends of the dancing roller 16 are in contact.

The dancer roller guides 17 can be slidably mounted on the side cheeks 1 in conventional slide guides, which are therefore not particularly shown. For example, they can be pivoted in the region of the deflection rollers 20, 21, so that the dancer roller guides 17 can assume the two extreme positions shown in FIG. 1. Correspondingly, the first end 18 of the dancer roller guides 17 has a lower and an upper position and the second end 19 an upper and lower position, as indicated by the double arrow 22. In the first position, the ends of the dancing roller 16 are in contact with the first end 18, while in the second position, depending on the control signals, they are in contact with the second end 19 or the stop between the ends 18, 19. The pivoting movement can take place by means of a pivoting drive which can act either on the first end 18 or centrally on the dancer roller guides 16, but also by a reversible lifting device or other known pivoting devices acting on the second end 19 of the dancer roller guides 16 .

Figure 2 shows a partially sectioned side view of part of the magazine 2 at the top of each

Side cheek 1 is arranged and contains the pairs of supply rolls 3, 4. The magazine 2 contains a carriage 24, which is shown in the idle state of the packaging machine and receives a set of more than two pairs of supply rolls 3 and 4. A carriage guide 25 extends transversely to the frame of the packaging machine or along the upper end of the side wall 1. The carriage 24 and the carriage guide 25 are essentially the same on both side walls 1, except that the carriage 24 on one side wall 1 has drive means, for example carries a drive motor for each first supply roll 3. The carriage 24 can be adjusted in a variety of known ways within the carriage guide 25; In the embodiment shown, a toothed rack is provided for this in a known manner, which is in drive connection with a slide drive motor via a pinion. The carriage 24 is adjusted by the control of the packaging machine in such a way that the pair of supply rolls 3, 4 with the web width suitable for the object to be packaged is brought into the working position shown in FIG. 1, in which the selected further supply roll 4 is arranged above the guide 10.

The carriage 24 contains a side wall 26, on the outside of which drive motors for each supply roll 3 are attached. Guide plates 27 are arranged on the inside of the side wall 26 at regular intervals, between which there are first guide slots 28 for receiving shaft journals 29 of the respective first supply rolls 3. The first supply rolls 3 are connected, possibly via a gear, in drive connection with the associated drive motor, in the embodiment shown in FIG. 1 by the tangential contact with the drive roller 6 driven thereby.

Alternating with the first guide slots 28, second guide slots 30 are provided between the guide plates 27 Receiving shaft journals 31 of the associated second supply rolls 4 is formed. In the selected working position of the slide 24, the second guide slots 30 are aligned with the aforementioned guides 10 in the side walls 1 of the packaging machine. In the shown resting state of the packaging machine, the shaft journals 31 are held in the second guide slots 30 by the aforementioned locks. Each lock consists in detail of a locking element 32, which, starting from a guide plate 27, bridges the second guide slot 30 and is in engagement with a locking receptacle 33 in the adjacent guide plate 27. The shaft journal 31 then lies on the locking element 32 and is thus held in the second guide slot 30. The locking element 32 is designed as an arm of an angle lever, the apex of which is articulated at 34 on the guide plate 27. The other arm 35 of the angle lever is articulated to the free end of a piston rod 36, the piston of which is acted upon by fluid pressure in a pressure medium cylinder 37.

Before a new packaging process begins, the shaft journals 31 of the further supply roll 4 are in the position shown in FIG. 2 in the second guide slot 30; the associated prism receptacles 7 are moved into the position underneath at the upper end of the respective guide 10 with the aid of a schematically illustrated lifting device 38, which is designed as a chain drive in the example shown. First, the dimensions of the object to be packaged are checked by the controller while it is being conveyed to the template table. If the dimensions are the same as in the previous packaging process, the carriage 20 remains in the selected working position. If, on the other hand, the dimensions are different, the slide 20 is moved with the aid of the slide drive into a new working position in which another one is second guide slot 30 with the further storage roll 4 locked therein, the packaging material of which has a web width corresponding to the object to be packed, is located above the prism receptacles 7.

Then the piston rod 36 is extended and the locking element 32 is released from the locking receptacle 33 and pivoted into the position shown in dashed lines, as a result of which the second guide slot 30 is released for the downward movement of the shaft journal 31 of the further supply roll 4 and the shaft journal 31 are recorded by the associated prism receptacles 7. The downward movement of the prism receptacles 7 takes place under control by the lifting device 38, which engages the prism receptacles 7 of the further supply roll 4 and is controlled by the control of the packaging machine. It ends when the roller guides 9 have reached the lower position on the guides 10 and the further supply roller 4 rests in its second, lower position of the drive roller 11. The curtain 12 is unwound from the other supply roll 4 alone, since the drive motor for the first supply roll 3 is stopped. Together with the downward movement, the dancer roller guides 17 are pivoted such that the first ends 18 of the dancer roller guides 17 are raised and the second ends 19 are low, so that the compensation loop 23 is formed on the dancer roller 16. The connecting and cutting device 13 is in its open position. The packaging machine is then in the position shown in FIG. 1 for carrying out the actual packaging process.

This packaging process is triggered and carried out in a manner known per se. The object to be packed is conveyed from the feed table to the feed table 5. He takes the curtain 12 with him, this for wrapping required web material is removed from the compensation loop 23 and the dancer roller 16 is moved a corresponding length away from the second closed end 19 of the guides 13. Any additional packaging material that may be required is removed from the rotatably mounted further supply roll 4. The movable part 15 of the connecting and cutting device 13 moves downwards in the direction of the fixed part 14, as a result of which the curtain 12 finally envelops the object to be packaged and its parts lying against one another are connected to one another. If desired, if the curtain 12 is of a suitable width, the object can subsequently also be packaged on the end faces by means known per se.

After the packaging process, the additional supply roll 4 is returned to the position shown in FIG. 1 by means of the lifting device 38 and the dancer roller 16 by the aforementioned swiveling or lifting device, the further supply roll 4 being in the upper position is locked. At the same time, the drive motor for the first supply roll 3 is actuated in order to take up the loop formed from the remaining curtain 12 during the upward movement of the further supply roll 4.

The above-described arrangement of the pairs of supply rolls 3, 4 in any number in the slide 24 of the magazine 2 at the upper end of the side cheeks 1 has comparatively little space requirement and enables the unsorted supply of objects of the most varied dimensions without manual intervention in the automatic sequence of the packaging process. The curtain 12 is unwound from the further supply roll 4 selected by the working position of the slide 20 and by the movement of the further supply roll 4 from the first, upper into the second, lower position clamped directly in front of the object to be packaged. The compensation necessary for the tension regulation of the curtain 12 is achieved by the dancer roller 16, which is used for all pairs of supply rollers 3, 4 contained in the magazine, so that the installation of dancer rollers for each individual pair of supply rollers 3 , 4 superfluous. The remaining of the material of the curtain 12 not used in the packaging after the packaging and upward movement of the further supply roll 4 is wound onto the first supply roll 3 by actuation of the drive motor. The entire packaging process therefore takes place in such a way that there is practically no waste of packaging material.

In the packaging machine described above, a sensor is provided which responds to the voltage applied to the curtain 12 and is connected to the control of the packaging machine. This ensures that when a predetermined voltage in the curtain 12 is exceeded, the drive motor is switched on and the necessary packaging material is also unwound from the first supply roll 3.

A second exemplary embodiment of the packaging machine described above is shown in FIGS. 3 and 4. This embodiment differs from the one described above essentially by a differently constructed curtain-forming means. In detail, the curtain-forming means is a gripper device 39 which, in the exemplary embodiment shown, forms a pair of squeeze rollers 40, the rollers of which are rotatably mounted in a frame 41. The frame 41 has receiving members at opposite ends, by means of which the frame 41 is received in the prism receptacles 7. The nip roller pair 40 takes the free end in its nip a web of packaging material that is wound onto the supply roll 2.

In this exemplary embodiment, the pair of squeeze rollers 41 thus replaces the further supply roll 4 of the previous exemplary embodiment. In FIG. 4, a pair of squeeze rollers 40 is shown in every second guide slot 30; however, it is readily possible to operate the packaging machine with only one gripper device 39 or only with one pair of squeeze rollers 40. Otherwise, the packaging machine is constructed in the same way. To carry out the packaging processes, the frame 41, like the further supply roll 4, is moved between the first and second positions for tensioning the curtain 12, the aforementioned sensor responding to the tension of the curtain and the drive motor being controlled via the control of the packaging machine and by means of the drive roller 6 packaging material is unwound from the supply roll 3. The packaging process is then carried out in the manner described above. At the end of the packaging process, however, the drive roller 11 is actuated in such a way that the curtain 12 is unwound further by about 5-10 mm. As a result, the connecting seam of the expired packaging process is removed from the curtain area, which is required for the subsequent packaging process. In this way it is achieved that only one connecting seam is present on the packaged object; the amount of waste of packaging material used is reduced to a minimum.

The exemplary embodiment according to FIGS. 3 and 4 enables a greater variation in the width of the packaging material and a reduction in the number of work processes in that only one gripper device 39 is present, which is used in all working positions of the slide 24 becomes. In particular, the gripper device 39 can remain in the second or lower position as long as the dimensions of the objects to be packaged do not change, so that the gripper device 39 does not have to be moved back and forth between the first, upper and second, lower positions for each individual packaging operation .

In a further variant, the magazine 2 with the supply rolls 3, 4 can also be arranged below the support table 5 instead of on the head of the side cheeks 1, only the direction of the vertical movement for producing the curtain 12 changing. Furthermore, it is also possible to arrange the magazine 2 with the supply rolls 3, 4 vertically in a plane in front of the connecting and cutting device 13 and to remove the curtain 12 from the respectively selected supply roll 4, with a corresponding deflection device must be provided. The magazine 2 with the slide 24 can also be arranged behind the support table 5 or at another location if a corresponding deflection device is present.

Claims

claims

1. Packaging machine containing a support table (5) for supporting an object to be packaged, a magazine (2) with a slide (24) which can be moved between different working positions in relation to the support table (5) and which has a plurality of rotatably mounted supports Contains supply rolls (3) of packaging material of different widths, wherein in each working position of the carriage (24) a curtain (12) of packaging material can be unwound from a selected supply roll (3), which is adapted to the dimensions of the object to be packed , a connection and cutting device (13) between the curtain (12) and the support table (5), a controllable device by means of which the curtain (12) between the connection and cutting device (13) and the support table (5) can be stretched, and a single voltage regulating device for the curtain (12),

characterized in that

the controllable device contains a curtain-forming means which is adjustable between a first and a second position, and that the curtain-forming means is arranged in its first position in the carriage (24) and is assigned to the selected, controlled, rotatable supply roll (3) and that in the second position of the curtain-forming means the curtain (12) is stretched between the connecting and cutting device (13) and the support table (5).

2. Packaging machine according to claim 1, characterized gekenn¬ characterized in that the magazine (2) contains a carriage guide (25) for the carriage (24).

3. Automatic packaging machine according to claim 2, characterized in that the carriage (24) contains guide plates (27) at regular intervals, between which first and second guide slots (28, 30) are determined.

4. Packaging machine according to claim 3, characterized gekenn¬ characterized in that the first guide slots (28) for the recording of shaft journals (29) of the supply rolls (3) are seen and that the supply rolls (3) can be rotated in a controlled manner.

5. Packaging machine according to claim 3, characterized gekenn¬ characterized in that the second guide slots (30) are provided for receiving the curtain-forming means in its first position and are arranged alternately with the guide slots (28).

6. Packaging machine according to claim 5, characterized gekenn¬ characterized in that every second guide slot (30) is assigned a lock for holding the curtain-forming means in the guide slot (30).

7. Packaging machine according to claim 6, characterized gekenn¬ characterized in that the lock contains a locking element (32) which bridges between a locking position in which the locking element (32) the second guide slot (30) between two adjacent guide plates (27) and the curtain-forming means rests on the locking element (32), and can be moved to an unlocked position in which the second guide slot (30) is free and the curtain-forming means can be moved out of the guide slot (30) and into it.

8. Packaging machine according to claim 7, characterized in that the locking element (32) on one of the adjacent guide plates (27) is pivotally mounted and in the locking position with a locking receptacle (33) in the other of the adjacent guide plates (27) of the Carriage (24) is engaged.

9. Packaging machine according to claim 8, characterized gekenn¬ characterized in that the locking element (32) forms an arm of an angle lever which is pivotally articulated with its apex (34) on one of the adjacent guide plates (27) and the other arm ( 35) is connected to a swivel device.

10. Packaging machine according to claim 9, characterized gekenn¬ characterized in that the pivoting device is a pressure-operated pivoting device with a Druckmittelzy¬ cylinder (37) and a piston rod (36) which is articulated on the other arm (35) of the angle lever.

11. Packaging machine according to one of claims 1 to 10, characterized in that on side cheeks (1) guides (10) are provided for the curtain-forming means and that in each working position of the carriage (24) a selected second guide slot (30) the guides (10) in the side cheeks (1) are aligned.

12. Packaging machine according to claim 11, characterized gekenn¬ characterized in that the magazines (2) above the support table (5) at the upper ends of side cheeks (1) are arranged and the supply rolls (3) horizontally between the magazines (2) run above the support table (5).

13. Packaging machine according to claim 11, characterized in that the magazines (2) with the carriage (24) are arranged below the support table (5).

14. Packaging machine according to claim 12 or 13, characterized in that the guides (10) run vertically and horizontally at a distance from the connecting and cutting device (13).

15. Packaging machine according to one of the preceding claims, characterized in that the curtain-forming means can be moved between the first and second positions by a lifting device (38).

16. Packaging machine according to one of claims 1 to 11, characterized in that the magazines (2) with the carriage (24) are arranged vertically.

17. Packaging machine according to one of the preceding claims, characterized in that the curtain-forming means is formed by a further supply roll (4), that each supply roll (3) is assigned a further supply roll (4) and that the further supply roll rollers (4) are freely rotatable.

18. Packaging machine according to claim 17, characterized in that prism receptacles (7) for the shaft journal

(31) of the further supply rolls (4) are provided and are guided with a roll guide (9) on the guide (10) of the associated side cheek (1).

19. Packaging machine according to claim 17 or 18, characterized in that the further supply roll (4) in its second position driveably rotatably mounted and the curtain (12) can be unwound essentially from the further supply roll (4).

20. Packaging machine according to one of claims 1 to 16, characterized in that the curtain-forming means is a gripper device (39) which is assigned to a selected supply roll (3) in each working position of the slide (24).

21. Packaging machine according to claim 20, characterized gekenn¬ characterized in that the gripper device (39) is formed by a pair of squeeze rollers (40), the rollers are rotatably mounted in a frame (41) and this at its opposite ends in a prism holder (7) can be accommodated and that each prism holder (7) is guided with a roller guide (9) on the guide (10) of the associated side cheek (1).

22. Packaging machine according to claim 21, characterized gekenn¬ characterized in that a roller of the pinch roller pair (40) rotatably mounted in its second position and the curtain (12) can be unwound essentially from the selected supply roll (3).

23. Packaging machine according to one of claims 20 to 22, characterized in that the gripper device (39) can be actuated in its second position at the end of a packaging operation in order to move the through the connection and cutting device (13) in the curtain ( 12) formed connecting seam from the area required for a subsequent packaging process, from the area to remove the selected supply roll (3) of the curtain (12) that has subsequently been unwound.

24. Packaging machine according to one of the preceding claims, characterized in that the only voltage-regulating device contains a sensor which responds to the voltage of the curtain (12) and which has a control for the selected, controlled, rotatable supply roll ( 3) is connected, further packaging material being able to be unwound from the supply roll (3) when a predetermined tension of the curtain (12) is exceeded.

24. Packaging machine according to one of the preceding claims, characterized in that the only tension-regulating device is formed by a dancer roller (16) which is assigned to the working positions of the carriage (24).

25. Packaging machine according to claim 24, characterized gekenn¬ characterized in that the ends of the dancer roller (16) are roller movable in dancer roller guides (17) which are above the connection and cutting device (13) from a position in front of the connection and Extend the cutting device (13) to a position between the support table (5) and the slide guide (25).

26. Packaging machine according to claim 25, characterized in that between the ends (18, 19) of the dancer roller guides (17) deflection rollers (20, 21) for forming a compensation loop (23) in the curtain (12) in the side cheeks (1) are rotatably mounted.

27. Packaging machine according to claim 26, characterized gekenn¬ characterized in that the dancer roller guides (17) on one of the guide rollers (20; 21) are pivotally mounted, that in a first pivot position of the dancer roller guides (17) the first end (18) lower than the second end (19) and in a second pivoting position of the dancer roller guides (17) the first end (18) is higher than the second end (19).

28. Packaging machine according to claim 26, characterized gekenn¬ characterized in that the dancer roller guides (17) in sliding guides along the side walls (1) are slidably mounted.

29. Packaging machine according to one of claims 25 to 28, characterized in that the dancer roller guides (17) at the first ends (18) and at the second ends (19) are provided with stops for the ends of the dancer roller (17).

30. Packaging machine according to claim 28, characterized in that a retractable stop is provided between the stops.

31. Packaging machine according to claim 28 or 29, characterized in that the stops are aus¬ formed as a limit switch.