EP0133286B1 - Film processing machine - Google Patents

Description

The invention relates to a film processing machine for producing, stacking and depositing flat packaging made of thermoplastic plastic film, such as bags or sacks, with a separating and welding device working in a horizontal plane for processing the double-layered film webs fed there vertically and directly to the separating and welding device connected stacking device, in which the packages are held hanging to form a stack, and with a connected, provided with a conveyor, storage table on which the packages are deposited and then transported away. Such film processing machines are known, for. B. from DE-A-2 233 408.

Foil processing machines must be suitable to produce bags or sacks of different designs. These are not only to be understood as different sizes, but also the different types of bags or sacks, for example whether they are bags or sacks that have a bottom seam, i.e. a transverse weld with an adjacent cut or a side seam, i.e. two welding seams running parallel to each other at a distance, between which a cut is made. Such welds are often referred to as double bottom seams.

In addition to the ability to produce different bag formats, bag making machines should also be able to process films with a wide variety of properties, such as films made from different film materials and different film thicknesses.

Some foils can be welded well, but are difficult to grasp and, accordingly, difficult to transport as foil webs or as finished bags in the processing machine. Thick foils need a longer welding time, with thin foils the welding time is usually short. However, due to their high flexibility, these are very difficult to process, especially difficult to transport as finished bags.

Since in a bag manufacturing machine the bags are not only produced from the double-layer film web, usually a half tube or tube, by cross-welding and cross-cutting, but also stacked inside the bag manufacturing machine and, if they are stacked, are possibly fed as a batch for further processing, for example by attachment of die cuts, it is very desirable to safely guide the individual bags or a stack of bags from one processing station to the next processing station. If, at today's high processing speeds, for example a cycle rate of 100 to 200 bags per minute, a bag slips or is not correctly detected in the transport devices, this leads to such difficulties and malfunctions that in many cases the entire film processing machine has to be shut down to remedy the situation .

The high work cycles in the production of bags or sacks often lead to the fact that the weld seams have not cooled sufficiently prior to stacking and thus bags or sacks bake together in an undesirable manner in the stacking device. Such a measure also leads to a malfunction, at least when the bags or sacks are used, for example in automatically operating filling systems or when a bag is removed from the stack for the purpose of use or when the bags are opened at their filling edge.

In practice, bags are mainly opened on pens because this is very safe and proven. It can be pointed out in this connection that the individual sheets are opened on pens during the production of newspapers. In practice, therefore, it is difficult to replace the pins.

Many bags or bag blocks have to be subjected to further treatment, for example for making grip hole punchings or cutouts that give grip loops. It is also often necessary to provide bag blocks with perforations for hanging them or perforations in order to be able to separate the individual bags from a block. Proposals have already been made to also make the perforation cuts for separating the bags when the bags are stacked with their blocking. However, this was only done in connection with pens on which the individual bags were opened. These devices must be installed in a very small space, because otherwise the losses of film material are too great.

There are many packaged goods where pinholes in the area of the pouch are very harmful as a result of prior stacking on pens. This difficulty arises not only from the fact that the needle sticks as external, albeit small holes, allow external influences on the interior of the bag. In many bags, in which high-quality, expensive items in particular are packaged, for example for the purpose of sales promotion, the perforations caused by pinholes interfere with the appearance.

DE-A 2233408 describes a method and a device for storing bags stacked to form a block in a vertical plane, in particular bags made of thermoplastic plastic film, which are connected to one another by welding, in such a way that the bags after being manufactured and stacked in a vertical plane are held in their upper area by a stacking device and in an area located below by a clamping device which clamps the stack on the end face. After this clamping, the stacking device is released and the upper area of the stack is reversed onto the conveyor belt sets, then held on this by a pinch roller and then released the clamping device. To make this possible, the storage table with conveyor belts can be rotated about a horizontal axis. This device has many clamping devices for its function and works slowly, because at the beginning of a new stack the previous stack has to be folded down on the storage table and transported away with its conveyor belts. In the case of bags of great length, this removal takes a certain time. Finally, the bag stacking device is provided in such a way that the bags can only be fed to the stack from one side. There is a risk that bags with their weld seams will stick together. To avoid this, the cycle of the bag production must be correspondingly slower.

The present invention is based on the object of providing such a film processing machine in which the bags or bag stacks are reliably detected in the production, stacking and storage stations, regardless of their dimensioning and their film material and properties of the film. The task is also assumed, despite the high number of cycles in the production of bags or sacks, to prevent the bags or sacks from baking when they are stacked due to weld seams which have not yet cooled sufficiently, and to provide a device for stacking and further processing a bag or a block of bags which in conjunction with, but also without pens, it enables stacking and allows sufficient and safe further processing of the bags after their manufacture.

To solve this problem, a film processing machine for producing, stacking and depositing flat packaging made of thermoplastic plastic film, such as bags or sacks, has a separating and welding device working in a horizontal plane for processing the double-layered film webs fed vertically there and one directly to the separator - and welding device connected, preferably provided with stacking pins, in which the packs are held hanging and with a connected conveyor, on which the packs are placed and optionally punched out by a punching device and then transported away, proposed according to the invention that in the area between the Stacking device and the storage table a reciprocating gripping device is arranged, which grips the stack of packaging and for its storage on the storage table can be moved over this.

The proposal according to the invention to grasp the bags stacked immediately after the manufacture as a stack of bags with a gripping device and to move them over a storage table and place them on the latter, makes it possible to produce the stack of bags quickly and with great differences in length are and can be transported away.

Advantageous developments of the invention are specified in the dependent claims 2-19.

The invention allows various modifications. The reciprocating gripping device can be designed such that it grips a stack of bags on both sides at the vertical side edges.

However, the further solution according to the invention is particularly advantageous in that the gripping device is designed as a bar and extends in the horizontal plane over the essential width of the film processing machine. This solution ensures that a gripping device can grasp a plurality of stacked bags arranged side by side. This solution also includes that the gripping device is not or need not be matched to the width of the individual bags produced, because regardless of the width of the individual bags or the number of bags lined up next to one another, their detection is ensured.

In a further embodiment according to the invention, it is proposed that the gripper bar is assigned an existing counter bar on the other side of the bag stack, which also extends over the essential width of the bag manufacturing machine and with the gripper bar for the purpose of clamping the bag stack or bags to it Gripper bar interacts.

Claims 4 and 5 provide a particularly advantageous solution. The sword is used to insert the bags of the stack into the pliers of the gripper bar. Since the gripper bar is moved back and forth, the sword can be stationary.

By clamping with the terminal block according to claim 6, it follows that when the gripper bar moves further, the bags of the stack are detached from the gripper bar, so that the final storage can take place on the storage table designed as a conveyor.

With the feature of claim 7, the aforementioned clamping of the stack of bags on the conveyor also ensures the predeterminable precise location, so that the punch comes into effect at a predetermined position on the stack of bags.

In order to also ensure the safe transfer of the individual bags or sacks to the stacking device after their manufacture, the features of claim 8 are proposed in a further embodiment according to the invention.

In the device according to the invention, the individual bags are held by the suction effect on the rotating precipitator before they leave the separating and welding device and are opened by the latter on the pins. This holder on the pins removes the precipitate from the bags. After stacking a predetermined number of bags, the gripping device grips the bag stack and then the stacking pins release the stack of bags by pulling them back. After the stack of bags has been transported onto the conveyor, the pressure bar holds the stack of bags firmly on the conveyor and only then does the gripping device release the stack of bags.

With the solution according to claim 9, the following is achieved: If bags are produced at a cycle rate of 100 bags per minute, the bags are stacked at a rate of only 50 bags per minute because there are a total of two stacking devices. Therefore, based on a stacking device, the time from depositing the previous bag to the next bag is sufficiently long that the weld seams have had the opportunity to cool down.

The further development specified in claim 10 ensures that the bags or sacks can have a very long length because there is no obstructing physical axis of rotation of the racket in the vertical plane of the bag feed.

In order to further process bags immediately after their manufacture and thus to avoid transport between manufacture and further processing, the features of claims 11 and 12 are proposed in a further embodiment according to the invention. The fact that, immediately after the production of the bags in a region below the separating welding device in connection with the stacking device, work surfaces are provided which form the basis for the further processing of a bag or a bag block, many advantages are achieved. So there is no further movement for further processing of a bag or stack of bags. This enables exact positioning of the machining operations to be carried out with little effort. At the same time, the processing tools can work in step with the bag production, so that simplification also takes place in this regard.

The holding device of the upper horizontal work surface specified in claim 13 can have different training forms with different movements. Characterized in that the holding device is provided with a support surface for the edge of the bag to be stacked according to claim 16, baking of the weld seam of the bag to be stacked is avoided with the previous bag of the stack.

According to claim 18, an elastic sheet which is bent outward is provided on each welding beam on the outward side. As the tool descends, this sheet rubs against the outer edge of the upper bag and thus expels the air between the upper bag and the bag below.

• Fig. 1 in perspektivischer Darstellung und im wesentlichen schematisch die Folienverarbeitungsmaschine,
• Fig. 2 in einem vertikalen Schnitt und im wesentlichen schematisch die Folienverarbeitungsmaschine nach Fig. 1,
• Fig. 3-6 die Folienverarbeitungsmaschine nach Fig. 2 in verschiedenen Arbeitsstellungen,
• Fig. 7 die Stapelvorrichtung nach Fig. 2 in Seitenansicht und teilweiser Darstellung,
• Fig. 8 den Niederschläger nach Fig. 2 in anderer Sicht und teilweiser Darstellung,
• Fig. 9 eine teilweise Darstellung des Greiferkopfes nach Fig. 2,
• Fig. 10 das Fallschwert nach Fig. 2 in perspektivischer und teilweiser Darstellung.
• Fig. 11 eine Verarbeitungsmaschine nach Fig. 2 mit abgewandelter Stapelvorrichtung,
• Fig. 12 die Stapelvorrichtung nach Fig. 11 in perspektivischer und teilweiser Darstellung,
• Fig. 13 die Stapelvorrichtung nach Fig. 11 in detaillierter Darstellung,
• Fig. 14 einen vertikalen Schnitt durch eine abgewandelte Beutelherstellungsmaschine,
• Fig. 15 eine Figur 14 gegenüber grössere Darstellung,
• Fig. 16 eine Figur 15 gegenüber abgewandelte Lösung,
• Fig. 17 einen Beutelblock in perspektivischer Darstellung,
• Fig. 18 eine Figur 14 gegenüber weitere Abwandlung.

The invention is exemplified in the drawings. Show it:

• 1 is a perspective view and substantially schematic of the film processing machine,
• 2 in a vertical section and essentially schematically, the film processing machine according to FIG. 1,
• 3-6 the film processing machine according to FIG. 2 in different working positions,
• 7 is a side view and partial representation of the stacking device according to FIG. 2,
• 8 shows the precipitation according to FIG. 2 in a different view and partial representation,
• 9 is a partial representation of the gripper head of FIG. 2,
• Fig. 10 shows the falling sword of FIG. 2 in perspective and partial representation.
• 11 shows a processing machine according to FIG. 2 with a modified stacking device,
• 12 shows the stacking device according to FIG. 11 in a perspective and partial illustration,
• 13 shows the stacking device according to FIG. 11 in a detailed illustration,
• 14 is a vertical section through a modified bag making machine,
• 15 is a figure 14 compared to a larger representation,
• 16 is a figure 15 compared to a modified solution,
• 17 a bag block in a perspective view,
• 18 shows a FIG. 14 with respect to a further modification.

1, the film processing machine 10 has the welding and stacking device 11 with the side walls 12 and 13 of greater height and the storage table 15 with the side walls 16 and 17 of lower height. The part for producing the bags and stacking them can represent a structural unit with the storage table 15. In many cases, however, it is expedient to produce the storage table 15 as a separate structural unit and to provide the separation welding device with the stacking device. This is indicated schematically in FIG. 1 by the dashed line 18, 18a. These statements also show that the storage table 15, which is also provided with a reciprocating gripping device to be described later, can be attached to film processing machines of different designs. This will also be described below in connection with FIG. 11.

The elements shown in the following Figures 2 to 6 are mounted in the side walls 13 and 14 or 15 and 17. Figures 2 to 6 show in the drawing only the storage in the walls 13 and 15.

The double-layer film 19 to be processed is fed via a first deflecting roller 20 and second deflecting roller 20a to the pair of preferred rollers 21, 22. It passes between the blow comb tubes 23 and 24 to the separating welding device 25, consisting of the welding bars 26 and 27, which rest against the cams 32 and 33 via associated webs 28, 29 with rollers 30, 31, which are driven by corresponding drive shafts 34 and 35 are driven. The welding bar 27 is verse with a knife 36 hen. The welding bar 26 has a corresponding longitudinal recess. It should be noted that the separation welding device is known. It can be replaced by another cutting and welding device.

Below the separating welding device, there is the rotating deposit 37, which consists of the hollow tube 38 and the sheet metal strip 39 which is bent over an approximately circular line over the length of the tube 38. Blower nozzles 40 extending from the hollow tube 38 are provided. These can be in the form of a longitudinal slot. The holes can also be drilled one after the other in a row or in two rows.

Two rows of holes on blow-out nozzles 40, 40a etc. are shown in FIG. The precipitate interacts with the stacking device, which initially consists of a strip 41 which extends parallel to the tube 38 and across the width of the machine and which is screwed to the wall 13 and accordingly also to the wall 14 via a plate 42, as shown in FIG Figure 7 emerges.

Arranged behind the strip 41 is the needle strip 43, which has needles 44 forward in the direction of the precipitation and, as FIG. 7 shows, a plurality of needles 44a and 44b at intervals. The needle bar is fastened at both ends to the piston rod 45 of a pneumatic cylinder 46, which is fastened to the wall 13 via connecting elements. As a result, the needle bar is retractable, as will be described later. The strip 41 has open recesses 47, 47a downward in the region of the needles 44, while the sheet 39 has opposite recesses 48, 48a open to the outside.

Sprockets 49, 50, 51 and 52 are mounted in the side walls 13, 16 and carry a chain 53. The chain wheels 49 and 52 are provided with disengageable drives. A mirror-image arrangement is present on the side parts 14 and 17. The chain 53 carries, as can also be seen from FIG. 9, a gripper bar 54 which consists of the upper bar 54a and the lower bar 54b, which can be moved like pliers. According to FIG. 9, the lower bar consists of a cross member 55, which carries a piston-cylinder arrangement 56 at both ends, so that the strip 54b can be displaced in the double arrow direction emitted via the piston rod. The upper bar consists of individual sections. These can be raised and lowered about the axis 57 via a piston-cylinder arrangement 58. A tension spring, not shown, ensures the open position as the starting position. The bars have opposite and spaced rows of bumps 58a on the inner surfaces facing each other. Between these humps with flat obliquely tapering wedge surfaces, a sword 59 designed in the form of a sheet metal engages, which extends between the side cheeks 13 and 14 and is fastened to the side cheek 13 via a flange 60. According to the representation in FIG. 10, this sword has recesses 61, 61a which are spaced apart and which are dimensioned and arranged at such a distance that the aforementioned bumps of the gripper bar can engage between them. The gripper bar 54 is guided on the side wall 13 within a rail 62.

The solution shown in Figure 9 is superfluous that the air cylinder 63 is fastened to the machine frame 13 by means of fastening elements 62, 62a, on the piston rod 64 of which a clamping bar 65 is arranged which extends across the width of the bag machine and which interacts with the conveyor belt 66 which moves around the two rollers 67 and 68 is guided, which are mounted in the frame 16 and 17. The roller 68 is provided with the motor drive.

A further pneumatic cylinder 69 is fastened to the frame 13, the piston rod 70 of which is mounted on the one leg 71 of an angle lever 72 which can be pivoted about the axis 73 and which carries the chain wheel 75 at its front lower end of the leg 74.

After the components of the film processing machine that are essential for the function have been described, the mode of operation in connection with FIGS. 2 to 6 will now be discussed.

25 individual bags are produced and separated from the film web 19 by the separating-welding device. The precipitate 37 is in the waiting position shown in FIG. 2. Before the welding bars 26 and 27 release the bag separated from the tube, it is held onto the precipitate by the suction openings 40. This is then turned clockwise in the indicated direction of arrow 76. The outer end of the sheet 39, as can be seen in FIG. 3, hits the upper edge of the bag onto the pins 44 projecting beyond the bar 41 towards the bag. Since the bag is opened on the pin, it is detached from the impact bar when it rotates further, as is indicated in FIG. 3. After a predetermined number of bags have been stacked in this way, the gripper bar is moved via the chain 53 by the drive of the chain wheel 49 in the direction of the bag stack, to the extent that the sword 59 between the bars 54 and 54b engages and the foil layers of the stack open the pliers. The stack of bags is thus folded. When the gripper bar moves back, the tongs move out of the area of the sword with the result that the tongs close under the action of the tension spring 47 and hold the bags of the stack in the process.

According to the illustration in FIG. 5, the gripper bar is moved so far over the belt 66 by the drive of the chain wheel 52 that the lower end of the stack of bags is still present in the region of the deflection roller 67. There the lower end of the bag stack is clamped by the clamping bar 65 of the pneumatic cylinder 63 with the result that with further loading movement of the gripper bar 54, the bag block is pulled out of the pliers and is thus placed on the upper run 66a of the belt, which can be moved in steps in the direction of arrow 77 indicated. If bag stacks of only a short length are deposited, then the gripper bar 54 should have a smaller height distance from the upper run 66a of the belt. In order to achieve this, the sprocket 75 is moved downward in the specified direction of rotation 77a via the pneumatic cylinder 69 and the piston rod 70 and the lever 72, so that the gripper bar has a smaller height distance from the tray. Corresponding elements that balance the chain length are available.

FIG. 6 shows that the gripper bar 54 has already been moved back into its waiting position in order to grab the next bag soon. The clamping bar 65 still clamps the stack of bags on the roller 67, the stack of bags being punched by a punching knife 78, driven by the piston rod 79 of the pneumatic cylinder 80.

It can be seen that in no phase of the processing sequence was neither the single bag nor the stack of bags free, but was kept in all of its movements. This enables precise alignment. With this solution it is also possible to process a wide variety of bag materials in terms of chemical composition, flexibility and other physical properties and different bag formats, especially with regard to length.

The design of the gripper bar, which extends over the width of the machine and which cooperates with the counterbars on the other side of the stack of bags, particularly advantageously in the form of a sword, which is mounted in a stationary manner, enables the stack of bags to be detected independently of the width of the stack of bags. It is thus understandable that two or even more stacks of bags can also be transported side by side because the solution according to the invention shows no restriction here.

11 shows that the gripper bar in connection with the counter bar on the other side of the bags, advantageously in the form of the fixed sword, can also grasp and transport away two opposing stacks of bags because the solution according to the invention is not subject to any restrictions in this regard either.

11 shows that two stacking trays are present below the separating welding device, so that the stacking tray 41a, 42a with the needle bar 43a and its drive through the cylinder 46a are added in mirror image to the previously described stacking tray. The method of operation is that the first bag is opened on the first stacking device 41a, the second bag on the second stacking device 41, the third bag is in turn opened on the first stacking device 41 and so on, specifically by means of a racket 81 which corresponds to the illustration in FIGS. 12 and 13 has a strip 82 which extends over the width of the film processing machine and is supported at both ends on an arm 83 which is pivotably pivoted back and forth on the side wall 13 on a pivot 84 in the arrow direction 85 indicated . In Fig. 12, reference numerals 41 and 41a denote the strips between which open-down recesses 47 pass through the needles 44.

The mode of operation will be described with reference to FIG. 13.

If bags with a side seam or a double bottom seam are produced by the welding bars 26 and 27 and the separating welding device has two welding devices 86, 86a and 87, 87a located one behind the other at a distance, then it is possible for the bag or sack to stick to it Stacking in the area of the stacking device has a heated weld.

If the bags are produced with a low cycle rate, for example 50 bags per minute, then due to the slow processing time here, the weld seams are adequately cooled, in particular if the air-blowing tubes 23 and 24 are present, as shown in FIG. 2. In order to achieve a higher number of cycles, it is proposed to open the first bag, for example, on the shelf 41a with the pins 44a, and the subsequent bag on the shelf 41 with the pins 44 there Bag and on the opposite shelf through the following bag.

In order to achieve this, the bat is provided in the region below the welding device with a blow-out opening 88 and 89 assigned to each side. If the racket is moved to the left in the direction of the rest 41a, then the outlets 88 blow. If it is moved to the right in the direction of the rest 41, then the outlets 89 blow, which extend over the entire length of the blow bar. They can consist of a continuous slot, but can also consist of individual holes located close together. In order to achieve the necessary rapid exchange of the pendulum racket, the arms 83, shown in FIG. 13, the arm 83, via pivot joints 90 and 91, piston rods 92 and 93 of pneumatic cylinders 94 and 95 are arranged, which are assigned holders 96 and 97 on rotary axes 98 and 99 are pivotable.

Fig. 13 also shows the sword 59 in connection with the pliers from the beam parts 54a and 54b. 13 are attached to a piston rod 100 because the chain drive shown in the drawings, which carries the gripper bar, can also be replaced by a pneumatic drive.

FIG. 14 shows the solution modified compared to FIG. 11 with the proviso that a racket 101 is used which, in the horizontal plane, corresponds to the double arrow direction 102 is moved back and forth. Pins 44 and 44a are present on associated, opposite piston rods of cylinders 46 and 46a.

According to FIGS. 15 and 16, the stacking device 41 and 41a with the vertical regions 103 and 103a and horizontal regions 104 and 104a is present below the separating and welding device 26 and 27. The racket 101 is fastened on its underside or on its top to a conveyor belt 105 which is moved back and forth via deflection rollers 106 and 107, so that the bags are stacked alternately on the stacking device 41 and 41a in succession.

The horizontal stacking surfaces 104 and 104a are assigned tools 108 and 108a, respectively, which perform perforations, punchings, perforations or advantageously welds. However, it can only be on holding devices, the mode of operation of which is described in connection with FIG. 16.

FIG. 16 shows the movement of the bat 101 in the direction of the arrow 109 to the right with the proviso that the upper end of the bag 110 is bent to the left due to the sudden blow. By blowing air out of the nozzle 101a, the upper end of the bag is then deflected to the right, as shown in dashed lines. A bag clamping strip 111 is arranged on the vertical rail 103 and has a horizontal leg 112 and a vertical leg 113. The vertical leg is provided with a guide so that a springback takes place against the pressure of a helical spring 114. As soon as the striker 101 or possibly a projecting ledge 115 arranged thereon has pressed the bag onto the stacking ledge 112, the upper end of the bag is also placed on the work surface 104 or the previous end of the bag at this time or a short time later. Then the hold-down device 108 according to FIG. 2 or a holding device rotatable about the axis 115 goes down and clamps the upper end of the bag. This ensures the position of the bag and, due to the horizontal extent of the upper contact surface, the position of the bag block. Editing can be done in this way.

It can be seen from FIG. 16 that it is also possible to work with the pins only according to the one system.

FIG. 17 shows bags which are connected to one another by a weld seam 117 in such a way that the following bag is connected to the previous bag of the bag block by a weld seam in a manner known per se. For this purpose, the two welding bars 108, 108a are present. Elastic sheets 117, 117a are arranged on each of these, which expel the air between the bags as the welding bar comes down and thus result in compressed stacks which promote welding to the stack and result in almost flush edges 118, 118a. The hold-downs or hold-downs 116, 116a have horizontal contact surfaces 119, 119a for the front edges of the bags, so that the weld seams 120, which may still be adhesive, are obtained, by means of which the welding device 26, 27 cannot bake each other. To hold the stack of bags, the welding bars 108 and the holding device act alternately with one another, so that no special needles 44, 44a are required.

Claims (19)

1. Foil processing machine (10) for producing, stacking and depositing flat packings of thermoplastic plastics foil such as bags or sacks, comprising a separating and welding means operating in a horizontal plane for processing the double- layered foil sheets vertically supplied thereat and a stacking means (41, 44) immediately connected to the separating and welding means, in which stacking means the packings are held hanging to form a stack, and comprising a connected depositing table (15) provided with a conveying means (66), on which depositing table the packings are deposited and then moved away, characterized in that in the area between the stacking means (41, 44) and the depositing table (15) there is arranged a reciprocating gripping device (54) gripping the stack of the packings and being movable across said depositing table for depositing said stack of packings thereon.

2. Foil processing machine according to claim 1, characterized in that the gripping device (54) is arranged as a beam extends in a horizontal plane substantially across the width of the foil processing machine (10).

3. Foil processing machine according to claim 2, characterized in that to the gripping beam (54) there is assigned a counter-beam (59) provided at the other side of the stack of bags.

4. Foil processing machine according to claim 2, characterized in that the gripping beam (54) comprises an upper beam portion (54a) and a lower beam portion (54b) which beam portions are pivotable in the manner of pliers about a horizontal axis of rotation or a plurality of assigned horizontal axes of rotation (55, 56) and in that a sword (59) engages between the upper beam portion (54a) and the lower beam portion (54b) when the stack interposed therebetween is being folded.

5. Foil processing machine according to claim 4, characterized in that both beam portions (54a and 54b) of the gripping device (54) have their mutually facing surfaces provided with spaced protrusions (58a) being engaged therebetween by the tongues formed by recesses (61) of the sword (59).

6. Foil processing machine according to claim 1, characterized in that in the foil processing machine and extending substantially across the width thereof, there is arranged a reciprocating clamping bar for clamping to the conveyer belt the stack of the packings deposited onto the conveyer belt by the gripping device (54).

7. Foil processing machine according to claim 1, characterized in that a punch for providing punched portions in the stack of the packings is arranged at the depositing table (78).

8. Foil processing machine according to claim 1, characterized in that the stacking means comprises a rotating depositer (37) made of a hollow tube (38), at which depositer there is arranged a curved sheet-metal strip (39) extending along the length of the tube, suction openings (40) are provided in said hollow tube and said sheet-metal strip and extend along the length thereof, and outwardly opened recesses (48) are provided at the outer edge of the sheet-metal strip at distances corresponding to the distances of the stacking pins (44) of said stacking means.

9. Foil processing machine according to claim 1, characterized in that closely below the separating and welding means, extending parallel thereto and in the manner of a mirror image with regard to the vertical plane of the supply of packings, there are arranged a right array of stacking pins (44) and a left row of stacking pins (44a) and there is provided a depositer of a type which alternately strikes the one packing onto the right row of stacking pins (44) and the succeeding packing onto the left array of stacking pins (44a).

10. Foil processing machine according to claim 9, characterized in that the depositer (81) consists of a bar (82) extending across the width or substantially across the width of the bag producing machine (10), which bar is supported to reciprocate about a horizontal axis (84), said bar (82) being provided with blowout openings (88, 89) at those two sides which face the rows of pins (44, 44a).

11. Foil processing machine according to claim 9, characterized in that the stacking means (41, 44) comprises a horizontal working face (104) which cooperates with tools (108, 108a) for further processing of the packings or the stack of the packings.

12. Foil processing machine according to claim 11, characterized in that the stacking means is provided with a first vertical portion (103) for stacking the packings thereat, and with an adjoining, outwardly directed horizontal portion (104) for processing the packings or the stack of packings thereat.

13. Foil processing machine according to claim 12, characterized in that the first vertical portion (103) is provided with a stacking bar (111) extending in a horizontal plane and a holding device (108, 116) is arranged at the horizontal tray (104) the- reabove, which holding device operates in the cycle of the stacking process.

14. Foil processing machine according to claim 13, characterized in that the stacking bar (111) is displaceable against the pressure of a spring (114).

15. Foil processing machine according to claim 13, characterized in that the holding device (116) of the upper horizontal working face (104) consists of a shaft (115) at which shaft there are provided holding fingers to be rotated in reciprocating motion.

16. Foil processing machine according to claim 15, characterized in that the holding fingers (116, 116a) are each provided with one supporting surface (119, 119a) for the edge of the bag.

17. Foil processing machine according to claim 11, characterized in that the tool (108, 108a) consists of a welding beam for blocking the bags.

18. Foil processing machine according to claim 17, characterized in that at each welding beam (108, 108a) at the outwardly directed side there is provided an elastic stripping sheet-metal piece (117, 117a) bent off in outward direction.

19. Foil processing machine according to claim 1 and one or a plurality of claims 2 to 7, characterized in that the distance of the stacking means (41, 44) to the separating and welding means (26, 27) is changeable.

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