EP0133286A1 - Film processing machine - Google Patents

Abstract

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.

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 one directly to the separating and welding device connected stacking device, preferably provided with stacking pins, in which the packs are held hanging, and with a connected conveying device on which the packs are deposited and, if necessary, punched out by a punching device and then transported away.

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 are bags or sacks that deal with a bottom seam, ie a transverse weld seam with an adjacent separating cut or a side seam, ie two weld seams running parallel and at a distance from one another, between which a separating cut is made. Such welds are also 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 film 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 the bags are produced in a bag manufacturing machine not only from the double-layer film web, usually a half tube or tube, by cross-welding and cross-cutting, but also stacked within the bag manufacturing machine and, if they are stacked, are optionally 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 slipped from the transport devices or is not properly detected, this leads to such difficulties and disturbances that in many cases the entire film processing machine must be shut down to remedy the situation.

The high work cycles in the production of bags or sacks often result in the stacking immediately following production that the weld seams have not cooled sufficiently before the stacking and thus bags or sacks undesirably bake together 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 also in 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 were. 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 the remaining, 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.

The present invention is based on the object of providing such a film processing machine in which the bags or stack of bags are reliably detected in the stations of manufacture, stacking and storage, 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, 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 packages are held hanging and with a connected conveyor, on which the packages are deposited 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 conveyor a reciprocating gripping device is arranged, which grips the stack of objects and transported to the conveyor and rests thereon.

The proposal according to the invention to take the stack of bags immediately after the manufacture as a stack of bags with a gripping device and to transport them to a conveyor and place them on the conveyor means that the bags are always held together and no single bag is lost or lost can detach or move from the other.

The proposal to use a reciprocating gripper between the storage of the bags or the stacking device in direct connection with the manufacture, which gripper the stacked bags grasped and transported in a coherent manner to a filing system allows various modifications. So the reciprocating gripping device can be designed so that it grips a stack of bags on both sides on 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 substantial width of the film processing machine. With this solution it is achieved that a gripping device can grasp a plurality of stacks of bags arranged side by side. This solution also includes that the gripping device is not matched to the width of the individual bags produced or need to be graduated, 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.

A particularly advantageous solution consists in the fact that the gripper bar has an upper bar part and a lower bar part which, like a pair of pliers, have a horizontal axis of rotation or an associated one horizontal axis of rotation are pivotable. The cooperating counter bar is then particularly advantageously designed in such a way that a sword engages between the upper bar part and the lower bar part when the stack of bags in between is folded, which in a further embodiment of the invention extends in a horizontal plane over the essential width of the machine and on Machine frame is arranged stationary. The sword thus serves 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 is stationary according to a particularly advantageous solution.

The movement of the reciprocating gripper bar can be done in different ways. For example, the two ends of the bar can be arranged on respectively assigned chains, which enable the gripper bar to be moved back and forth by changing the direction of rotation.

In many cases, however, it can be advantageous for the reciprocating gripper bar to be arranged at its two ends at the front ends of associated piston rods of pneumatic cylinders.

The tongs can also be opened in order to release the stack of bags, for example by means of link guides attached to the machine frame. There may also be a pneumatic piston-cylinder arrangement that opens and possibly closes the pliers.

In a further embodiment according to the invention it is proposed that in the machine is arranged a reciprocating clamping strip extending over its substantial width, which clamps the stack of objects placed on the conveyor by the gripper device on the conveyor. This clamping then results in the bags of the stack being released from the gripper bar when the gripper bar moves further, so that the final storage can take place on the storage table designed as a conveyor.

If there is a punch on the storage table for making punched holes in the stack of bags, the aforementioned clamping of the stack of bags on the conveyor also ensures the predeterminable exact 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 after their manufacture to the stacking device, it is proposed in a further embodiment according to the invention that the rotating precipitate consists of a hollow tube on which a bent sheet metal strip extending over the length of the tube is arranged , In the hollow tube and in the sheet metal strip extending over their length there are suction openings and on the outer edge of the sheet metal strip at intervals which correspond to the spacing of the stacking pins of the stacking device, open recesses are present.

The measures described above thus lead to the working method according to the invention that the individual bags before they leave the separating and the welding device is held by the suction on the rotating precipitator and is opened by the latter on the pins and this holder on the pins frees the pouch from the precipitate, after the stacking of a predetermined number of bags the gripping device detects the stack of bags and then the stack of pins withdrawing them, release the stack of bags and, after transporting the stack of bags onto the conveyor, the pressure bar holds the stack of bags on the conveyor and only then does the gripping device release the stack of bags.

In order to avoid baking of the weld seams of the stacked bags in the case of a high cycle number of the bag or sack production or a correspondingly high cycle number of the storage, the. are opened on pins which are retractable on a needle bar and by a pneumatic piston-cylinder arrangement and a reciprocating racket is arranged, which opens the bags successively on the pins, in particular in a solution according to claim 1, is in Another embodiment of the invention proposed that a row of pins is arranged just below the separating and welding device and parallel to these, mirroring the vertical plane of the bag feed, and a racket of this type is present, which the first bag on the first row of pins and the second bag on opposing second row of pins and the third bag on the first row of pins and the fourth bag on the second row of pins and in this way until a predetermined number of bags has opened. This solution achieves the following:

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 welds have had an opportunity to cool down.

In a particularly simple manner, the racket consists of a bar which extends over the width or substantial width of the bag-making machine and is mounted to swing back and forth about a horizontal axis, the bearing axes having a short length only being present in the region of their attachment to the side walls of the machine. With this solution it is achieved 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 favor the alternating opening on one and the other row of pins, it is proposed in a further embodiment according to the invention that the strip going to the right is provided with blow-out openings on both sides facing the rows of pins.

The back and forth movement of the racket can be done by a pneumatic rotary piston motor. The solution is particularly advantageous that piston rods of pneumatic cylinders are arranged on both sides of the arms carrying the blow bar, in which case the cylinders are then pivotally mounted about horizontal axes in a further embodiment according to the invention.

In order to further process bags immediately after their manufacture and thus to avoid transport between manufacture and further processing, it is proposed in a further embodiment according to the invention that the stacking device has a horizontal working surface with which the bags or the pile of bags are further processed in connection with tools .

The solution according to the invention, in connection with the manufacture of the bags in an area below the separating welding device in connection with the stacking device, at the same time providing work surfaces which form the basis for the further processing of a bag or a bag block, has many advantages yourself. 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 time with the bag production, so that simplification also takes place in this regard.

The holding device of the upper horizontal work surface can have different forms of training with different movements.

In connection with the proposal that the holding device is provided with a support surface for the edge of the bag to be stacked, the weld seam of the bag to be stacked is prevented from baking on the previous bag of the stack.

There, too, the tools, which each process a single bag, can perform the holding function, advantageously in an alternating rhythm between a welding bar. The processing tool can thus be a welding bar, which connects the bags of the block in a known manner in such a way that, with the stacking of the bags, each bag fed to the stack is connected to the preceding bag by welding. This avoids stacking pins, which could, however, also be retained.

In order to achieve the tight contact of the bags of a stack of bags, it is proposed in a further invention to attach an elastic sheet which is bent toward the outside to the tool, in particular the welding bar, on the outward-facing side, which on the downward movement of the tool brushes the upper bag towards its outer edge 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 in perspektivischer Darstellung 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 view of the gripper head in a perspective view of FIG. 2,
• 10 is a perspective and partial representation of the falling sword according to FIG. 2,
• 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 manufacture 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 explanations 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 FIGS. 2 to _b are mounted in the side walls 13 and 14 or 15 and 17, FIGS. 2 to 6 only show the storage in the walls 13 and 15 in the drawing.

The double-layer film 19 to be processed is fed to the pair of preferred rollers 21, 22 via a first deflection roller 20 and a second deflection roller 20a fed. 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 bear against the cams 32 and 33 via associated webs 28, 29 with rollers 30, 31, which are connected via corresponding drive shafts 34 and 35 are driven. The welding bar 27 is provided with a knife 36. The welding bar 26 has a corresponding longitudinal recess. It should be noted that the separation welder 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 works together with the stacking device, ': e initially consists of a bar 41 extending parallel to the tube 38 and across the width of the machine, which is screwed to the wall 13 and accordingly also to the wall 14 via a plate 42, such as this is apparent from Figure 7.

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 are movable 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 bar 54b can be displaced in the indicated double arrow direction 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 59 on the inner surfaces facing one another. Between these bumps with flat obliquely tapering wedge surfaces, a sword designed in the form of a sheet metal engages 59, 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 via fastening elements 62, 62a, on the piston rod 64 of which a clamping bar 65 is arranged which extends across the width of the bagging 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 that has been separated from the tube, the bag 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 54a and 54b engages and the foil layers of the stack open the pliers. The stack of bags is thus folded. With the retraction of the gripper bar, 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.

According to the illustration in FIG. 6, the gripper bar is driven so far over the belt 66 by the drive of the chain wheel 52 that the lower end of the "pile of tunnels is still in the region of the deflection roller 67 is present. There, the lower end of the stack of bags is clamped by the clamping bar 65 of the pneumatic cylinder 63 with the result that the bag block is pulled out of the pliers when the gripper bar 54 is moved further and is thus placed on the upper run 66a of the belt, in the direction indicated by the arrow 77 is movable in batches. 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 soon pick up the next bag. 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 individual bag nor the stack of bags free, but was kept in all of its movements. This makes it an accurate one Alignment possible. 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 more stacks of bags can also be transported side by side at the same time, because the solution according to the invention shows no restriction here.

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

Fig. 11 shows that below the separating welding device there are two stacking trays, 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 work is done shows that the first bag is opened on the first stacking device 41a, the second bag on the second stacking device 41, the third bag in turn on the first stacking device 41 and so on, by means of a racket 81 which, as shown in the figures 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 mounted to and fro 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 be stacked in the Area of the stacking device has a heated weld.

If the pouches are produced with a low cycle rate, for example 50 pouches per minute, then the weld seams are sufficiently cooled due to the slow processing time here, in particular if the air-blowing tubes 23 and 24 are present as shown in FIG. 2. In order to achieve a higher cycle rate, it is suggested

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. An alternate opening is thus carried out on the one shelf by the one bag and on the opposite shelf by the subsequent 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 quick change 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 is moved back and forth in the horizontal plane in accordance with the double arrow direction 102. 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 is present below the separating and welding device 26 and 27, with the vertical regions 103 and 103a and horizontal regions 104 and 104a. The racket 101 is fastened on its underside or on its top to a conveyor belt 105 which is moved back and forth over 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 striker 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, as shown in dashed line, deflected to the right. 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 racket 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 either one of the two systems can be used to work with the pins.

FIG. 17 shows bags which are connected to one another by a weld seam 117 in such a way that, in a manner known per se, the subsequent bag is connected to the previous bag of the bag block by a weld seam. For this purpose, the two welding bars 108, 108a are provided, on each of which there are elastic sheets 117, 117a are arranged, which expel the air between the bags as the sealing bar descends and thus result in compressed stacks which promote welding to the stack and result in almost aligned 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 (31)

1.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 vertically there and a directly connected to the separating and welding device, Stacking device, preferably provided with stacking pins, in which the packs are held hanging and with a connected conveyor device, on which the packs are deposited and, if necessary, punched out by a punching device and then transported away, characterized in that in the area between the stacking device (41, 44 ) and the conveying device (15) a reciprocating gripping device (54) is arranged, which grasps the stack of objects and transports them to the conveying device (15) and deposits them thereon. 2. Apparatus according to claim 1, characterized in that the gripping device (54) is designed as a bar and extends in the horizontal plane over the substantial width of the film processing machine (10). 3. Apparatus according to claim 2, characterized in that the gripper bar (54) is assigned an existing on the other side of the bag stack counter bar (59). 4. The device according to claim 2, characterized in that the gripper bar (54) has an upper bar part (54a) and a lower bar part (54b) which, in the manner of a pair of pliers, about a horizontal axis of rotation or associated horizontal axes of rotation (55, 56 ) are pivotable. 5. The device according to claim 4, characterized in that a sword engages between the upper bar part and the lower bar part when folding the intermediate stack of bags. 6. Device according to claims 4 and 5, characterized in that the bars (54 a and 54) of the gripping device (54) are provided on their mutually facing surfaces with spaced bumps between which the tongues of a sword engage. 7. The device according to claim 6, characterized in that the sword extends in a horizontal plane over the essential width of the machine and is arranged fixed on the machine frame. 8. The device according to claim 1 and one or more of claims 2 to 7, characterized in that the reciprocating gripper bar is mounted at its two ends on an associated chain present there. 9. The device according to claim 1 and one or more of claims 2 to 8, characterized in that the reciprocating gripper bar is arranged at its two ends at the front ends of associated piston rods of pneumatic cylinders. 10. Device according to claims 1 to 9, characterized in that the pliers is opened by a backdrop attached to the machine frame. 11. Device according to claims 1 to 9, characterized in that there is a pneumatic piston-cylinder arrangement which opens and optionally closes the pliers. 12. The apparatus of claim 1 and one or more of claims 2 to 8, characterized in that a reciprocating terminal strip extending over its substantial width is arranged in the machine, which the stack of objects placed by the gripping device on the conveyor clamped to the conveyor. 13. The apparatus according to claim 1, characterized in that the conveying device (15) in a manner known per se represents a movable belt (66), which is designed as a storage table and on the storage table (78) a punch for making punchings in the stack of bags available is. 14. The apparatus according to claim 1 and one or more of claims 2 to 13, characterized in that the rotating precipitate (37) consists of a hollow tube (38) on which a bent sheet metal strip (39) extending over the length of the tube is arranged, in the hollow tube and in the sheet metal strip there are suction openings (40) extending over their length and on the outer edge of the sheet metal strip at intervals which correspond to the distances of the stacking pins (44) of the stacking device, recesses (48) which are open to the outside available. 15. Working method with the device according to claims 1 to 14, characterized in that the individual bags are held before they leave the separating and welding device by the suction on the rotating precipitator and are opened by this on the pins and this holder on the pins the bags are freed from the precipitate, after the stacking of a predetermined number of bags, the gripping device detects the stack of bags and then the stack pens release the stack of bags by pulling them back and after the transport of the stack of bags on the conveyor, the pressure bar holds the stack of bags on the conveyor and only then the gripping device releases the stack of bags. 16. Working method according to claim 15, characterized in that the stack of bags resting on the conveying device is provided with punchings by the punching device and then the stack of bags is released by withdrawing the pressure strip from the conveying device. 17. Device for stacking bags or the like packaging made of thermoplastic film, which is attached to the horizontal working separating and welding device and has pins which are attached to a needle bar, which is retractable by a pneumatic piston-cylinder arrangement and a reciprocating racket is arranged, which opens the bags one after the other on the pins, characterized in that a row of pins (44, 44a) is arranged just below the separating and welding device and parallel to it, mirroring the vertical plane of the bag feed and there is a racket of the type which places the first bag on the first row of pins (44) and the second bag on the opposite second row of pins (44a) and the third bag on the first row of pins (44) and the fourth bag on the second Row of pins (44a) and opens in this way until a prep certain number has been opened before bags. 18. The apparatus according to claim 17, characterized in that the racket (81) consists of a across the width or substantial width of the bag making machine (10) extending bar (82) which is mounted swinging back and forth about a horizontal axis (84) The bearing axes (84) of short length are only present in the area of their attachment to the side walls (13, 14) of the machine (10). 19. The apparatus according to claim 18, characterized in that the strip (82) on both the pin rows (44, 44a) facing sides with blow-out openings (88, 89) is provided. 20. Device according to claims 17 to 19, characterized in that the piston rods (92, 93) of pneumatic cylinders (94, 95) are arranged on both sides of the arms (83) carrying the blow bar (82). 21. The apparatus according to claim 20, characterized in that the cylinders (94, 95) about horizontal axes (98, 99) are pivotally mounted. 22. Device for stacking bags or similar packaging made of thermoplastic plastic film, which is attached to the separating and welding device working in the horizontal plane and has a stacking device with a reciprocating bat, and below the separating and sealing device and to this, the stacking device is arranged in mirror image of the vertical plane of the bag feed and a racket of this type is present, which places the first bag on the first stacking device and the second bag on the opposite stacking device and the third bag on the first stacking device, the fourth bag hits the second stacking device and in this way until a predetermined number of bags has opened,
characterized in that the stacking device has a horizontal work surface (104) with which the bags or the bag stack are further processed in connection with tools (108, 108a). 23. The device according to claim 22, characterized in that the stacking device has a first vertical region (103) on which the bags are stacked and an adjoining, outwardly directed horizontal region (104) on which the bag or the block of bags is processed. 24. The device according to claim 22, characterized in that associated with each stacking device, the first vertical region (103) is provided in a manner known per se with a retractable row of needles (44). 25. The device according to claim 22, characterized in that the first vertical region (103) is provided with a stacking strip (111) extending in the horizontal plane and on the horizontal overlying shelf (104) a holding device (108th working in time with the stacking , 116) is present. 26. The apparatus according to claim 25, characterized in that the stacking strip (111) against the pressure of a spring (114) is displaceable. 27. The apparatus according to claim 4, characterized in that the holding device (116) of the upper horizontal working surface (104) consists of a shaft (115) on which there are rotatable holding fingers. 28. The apparatus according to claim 27, characterized in that the retaining fingers (116, 116a) are each provided with a contact surface (119, 119a) for the edge of the bag. 29. The device according to claim 22, characterized in that the tool (108, 108a) consists of a welding bar for blocking the bags. 30. The device according to claim 29, characterized in that on each welding beam (108, 108a) on the outward-facing side there is an electrical wiper plate (117, 117a) bent outwards. 31. The device according to claim 1 and one or more of claims 2 to 7, characterized in that the distance between the stacking device (41, 104) to the separation welding device (26, 27) is variable.

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