DE2337939B2 - Process for forming a continuously moving hose and device for carrying out the process - Google Patents

Description

The invention relates to a method for reshaping a continuously moving filled hose Cuboid single packs with two broad sides, two narrow sides and two end faces as well as triangular lobes protruding from the end faces in the area of the narrow sides, corresponding to the fold lines provided in the hose material. Further the invention relates to a device for carrying out the method.

Numerous machines and methods of the aforementioned type are known. So describes z. B. the German Auslegeschrift 12 13 781 a procedure and a device for the production of filled and closed cuboid packs. With the well-known The method is closed at one end and under increased internal pressure Hose section enclosed on all sides in an area delimitation corresponding to the package shape and supported and the enclosed, deformed and filled tube section by a transverse sealing seam closed and separated from the tube in the middle of the seam. Enclosing the hose section on all sides takes place by means of at least two symmetrical parts forming tools, each consisting of two stationary plates, parallel to the hose axis and each other, as well as shaped pistons and shaped surfaces exist, whereby pivotable folding tools must still be provided. In the known case, you have to the continuous production of the packs at least two consecutive molds can be provided, those below for sealing and Separating a pair of jaws is assigned, which can be moved relative to the mold halves.

During this continuous hose feed movement, the pairs of jaws, together with their The mold halves are sequentially engaged with the tube.

The disadvantage is the complex construction of the known device, which is responsible for the strong accelerations of the parts provided with not insignificant mass must be designed. It show up also difficulties in synchronizing the parts assigned to each pair of jaws and in addition nor of the individual pairs to each other.

From US Patent 33 20 718 is a device known with a conveyor wheel. On this wheel welding jaws are evenly distributed around the circumference, whereby Welding opposing jaws guided separately and synchronously

must be brought together with the former welding jaws. In addition, this Device due to the likewise difficult bringing together of opposing trough-shaped parts only forms a pack in the form of a pillow gi. Separated from the circular shape wheel with the In addition to the trough-shaped separate outer parts, welding jaw halves are conveyed via a conveyor In addition, the welding opposing jaws synchronously with the filled hose located in between retracted. There are considerable difficulties with this synchronization. There are in disadvantageous Way in the known device no measures are taken to ensure that the chain-like abutting Packaging in the cavity molds has a greater circumferential length on the outside than on the inside. That can too Cause material jams or expansions in the packaging tube. Because of the difficult to master Synchronization creates threading problems. The complicated structure also sees isolation of the packaging withdrawn in a chain-like manner from the conveyor wheel by a spaced apart from the Conveyor wheel arranged cutting wheel before, with the separated packs then still one completely Have undefined shape.

The invention is therefore based on the object of a method and a device of the type mentioned at the beginning Kind of reshaping a continuously moving hose into cuboid single packs so too improve and design that the device and its individual components, such. B. welding devices, be moved continuously and yet can be designed simply and that despite great performance the longest possible welding time is obtained.

According to the invention, the object is achieved with regard to the method in that the hose is guided over a curved path in such a way that the hose area provided for forming one narrow side of the pack is on the inner, shorter side of the web and the hose area provided for forming the other narrow side of the pack is on the outer , faces longer side of the web, and that the tube section lying on the inner side of the web is folded along the fold lines to form the triangular flaps, whereupon the tube is divided by cross-welding and cutting along the cross-welding lines and then the pack is folded in on its other narrow side onto an in opposite direction curved path are transferred. Ahren this Ve.- ^f the first time allows an almost error-prone continuous operation, so that the through seat of this mass product can be significantly increased. The carrier material web coated with plastic, usually polyethylene, is folded in a known manner once along its center line so that two superimposed material webs result, which are connected to one another at one edge via the fold line and along the other edge, where the both free webs of material are connected by means of a longitudinal weld seam. A filling device is provided in front of the longitudinal welding station, which has a filling tube that extends far into the hose running more or less obliquely downwards, which then merges into the curved area, f even before the packaging is formed or even separated, the hose is filled with liquid. The packages are preformed in a path following a curved curve, the packages being arranged on edge and guided along this curved path. Upright here means that the wide side walls of the cuboid packaging are arranged in front and behind or left and right, while the narrow side walls run above and below or outside and inside. Obviously, the outer radius of curvature is greater than the inner one, in such a way that the upright packaging is still stretched on the outside, ie the length of the tube has not yet been reduced, while the narrow side walls arranged on the inside on the smaller radius of curvature are already folding leads to a reduction in the original length of the hose. Even during this arrangement, ie with the outer side wall stretched and the narrow inner rope wall already folded, the transverse welding and separation of the individual packages from one another takes place, e.g. B. by cutting, the transverse welding station being moved along with the packaging running over the curved line. More precisely, it involves a large number of welding stations. In the context of the method according to the invention, it is also important that the transverse welding takes place during the rotation. As a result, the weld seams of welding jaws attached to the rotating parts can be produced and hardened in sufficient time without having to accept synchronization difficulties or leakage risks as a result.

After the packaging has been separated, it is immediately placed on the second narrow side Folded transition to the radius of curvature in the opposite direction of curvature. The folding of the second narrow sides takes place when the packaging after the separation of the mentioned first circle with the aforementioned radius of curvature overflows to a second with a smaller radius of curvature, the resulting direction of rotation is reversed here. The folding of the second, at first The speckled remaining outer narrow side can be done while the wraps are on the second another radius of curvature run in the opposite direction of curvature. After passing through the stations the individual packs are thinly preformed that only one pressing of the protruding Lashing and gluing the same must be done at the top or bottom of the packaging.

The device for carrying out the method with tracks that are closed along vertical planes continuously rotating shaping, cross-welding and cutting tools that can be fed in from above grasp the filled hose and carry it with you while you eiti the path of the hose determining section run through their path, is characterized in that two associated counter-rotating, An S-shaped conveyor track defining conveyor wheels are provided, the first conveyor wheel as a folding conveyor wheel is formed where ^ i at one of a particular Angle enclosed circumferential section of the folding conveyor wheel the hose area provided to form the one side of the pack can be applied, the Folding conveyor wheel designed as a gripping device, as well as cross-welding and cutting tools carries and the second conveyor wheel forming die for forming the other narrow side of the packs having.

The hose and the chain-like

the packaging is thus guided around the circumference of the folding conveyor wheel, so that deformation, transverse welding and separation can be carried out continuously during the rotary movement without disturbing the filling process and the continuous flow. The arrangement of the second conveyor wheel next to the folding conveyor wheel represents a reversal of the form principle in that on the first, the folding conveyor wheel, only the so-called inner narrow side walls can be created by shortening the length of the hose, while on the second conveyor wheel, however, with simpler means , namely without circling devices. the shaping of the opposite, so-called outer narrow side surfaces of the packaging can be carried out. (Thanks to the measures according to the invention, a surprisingly large number of welding tools can be arranged in a very confined space, and the ! .CIMlIIIg UCI V Ol I ILtlill'lg SCIII gCStCIgCI i WLMUL ^- II the conveyor wheels represents a mechanically simple solution.

The invention is also advantageous designed that the hose can be fed tangentially to the l'altfordcrrad and that the as a plant for the Tube serving circumferential portion of the folding bike through an angle of about 250 can be included.

Ls is also advantageous when in a particular Embodiment of the transverse welding station, the transverse welding and separating unit connections are cam controlled In this way, a compact design can be provided, and the controls via cam disks on the one hand the cutting knife and on the other hand the sealing jaws can mechanically in a small space can easily be coupled together.

According to the invention, the axes of rotation of the first and second conveyor wheels are arranged parallel to one another. (This measure leads / u a further simplification of the apparatus because I'mlenkroüen ■ be jingespart and no Gcschwindie'vcitsdifferen- / :: r, on removal of the packaging or of the, Ruches v.hl arise.

To control the Greifwimchtiingen is at one A special embodiment of the invention Fixed cam disk in the area of the axis of the I, iitfördcrrades attached, with their control surface Thrusts are controllable in the radial direction, the The plunger at its outer end is the gripping device wear. (This type of control represents a robust one Construction. Their manufacture. Operation and maintenance do not present any difficulties.

According to the invention, it is purely if the Abuts at their inner ends have drainage rollers and a lever is hinged at each of their outer ends. which has a U-shaped cross-section. that the web of the U-lever has a length that is almost equal to the height of the folded packaging and is greater than that of the shear arm of the U-lever. The bars grip the inner line of curvature of the Fall conveyor belt pulled around the hose or the chain of the packaging and carry effortlessly to Deformation of the fold lines already present in the hose material. A special control of the levers is not required because it automatically adapts to the so-called inner narrow side wall during rotation the packaging.

In another embodiment of the invention, the gripping device is rotatable on the plungers articulated, positively controlled grippers. These record at the contact point of the hose the folding conveyor wheel, the connection points of the adjacent packagings and thus manage the folding along the intended folding lines. The positive control of the grippers mentioned can also be mechanically coupled with the radial movement of the plunger.

In order to complete the final deformation, the invention has in a special further embodiment the feature that on the second conveyor wheel evenly distributed form punches are attached on its square circumference, the length of which in the direction of rotation is equal to the length of the webs of the lever. The / vLpiii ¹ f-öriti'rrprj ict obviously easier, namely without '. the gripping devices or built without the levers From the Gi eifvorrichlungen of the first, the folding conveyor wheel, the individual packages are printed on the / wide conveyor wheel and the forming stamp that

the red tilting on the Uli j><jgeiianmcii iiuijeicii SLiititüicn . "> side wall of the respective packaging is done properly.

The invention is explained in the following description in conjunction with the drawings. Fs shows

I schematically shows the overall structure in a side view the device according to the invention.

I i g. 2 the top view of the discharge station.

3 shows the view of the removal station from FIG. 2 in Direction of the arrow »/!« Seen.

I i g. 4 shows another embodiment of the gripping device of the folding conveyor wheel,

I i g. 5 shows a cross section of the ring-welded, filled and not yet formed tube.

Fig. 6 is a cross section of the on the inner

narrow side wall of preformed tube

' a place where the packaging has not yet been cross-welded and not yet isolated, but lies next to one another like a chain and

F i g. 7 shows, in section, an enlarged illustration of the transverse welding station with cutting device.
: In Fig. I the entire system is shown, some parts are shown schematically. The entire machine is carried on the frame 1, which approximately in the middle has a towering stand 2 on which the upper pulleys, the filling station 3 and ^; the butt welding station 4 for producing the longitudinal seam, ie closing the hose 5, are held. The roller 7 of the carrier material web 8 is rotatably mounted on the shaft 6 shown on the left in FIG. The carrier material runs from this role! over guide rollers 9 and 10 to 11 above in the direction of the arrow, it is deflected by the diagonally arranged guide roller 12 and directed to the guide rollers 13 and 14 over to the lower right in the direction of the Faltfördcrrad 15 to the substrate sheet 8 after leaving the guide roller 14 folded by known folding devices not shown in the figures so that a kink occurs along the center line 16 in such a way that the free ends or edges 17 and 18 of the material web are arranged opposite one another, as shown in the area below the filling station 3

At this point the hose 5 is still open so that the filling pipe 19 can be inserted into the hose 5. The filling tube extends from above the butt welding station 4 into the lower part 20 of the hose 5. The level 21 of the liquid 22 can be clearly seen in the mentioned lower region 20. The butt welding station 4 has a

Container 23 for the plastic granulate and an extruder 24, which introduces the liquid plastic to the point between the free edges 17 and 18 of the carrier material and between the rollers 25 and 25 '. These rollers shape the plastic butt weld seam into a profile, if necessary, which is cooled down at the same time. In the lower part 20 of the hose 5, the profile-like butt weld has solidified in such a way that the liquid 22 can be poured in.

The axes of rotation 26 and 27 of the folding conveyor wheel 15 are transverse to the projection of the running direction of the hose 5 or the second conveyor wheel 28 is arranged. The cold conveyor 15 has 18 gripping devices 29, the are described in more detail below. At the point indicated by the arrow 30, the Activity of the transverse welding station 31, which is shown in Fi g. 7 is described in more detail, with the cutting blades 32. From the Overall representation of FIG. 1 is also the fixed one Cam disk 33 is shown, the control surface 34 of which is the Gi'ciiVöiTiCMiüi'igcM 23 iicwcgi. The F <i

driven in the direction of arrow 36.

The second conveyor wheel 28 is in the opposite direction of rotation, as shown by arrow 37 driven. It has forming punches 38 on its circumference, which have no moving parts. Next to the Second conveyor wheel 28 is the delivery station 40, which is shown in FIGS. 2 and 3 is shown in more detail.

In Fig. 2, the folding conveyor wheel 15 is not shown again, and the second conveyor wheel 28 is only indicated schematically. The isolated packagings 41 are shown, their tabs 42 in the upper Part n ^ ch survive and shown in Fig. 3 by Pressure jaws 43 after previous heating by the heating device 44 on the top or bottom the packaging. A conveyor 45 (Fig. 3) takes the in Fi g. 3 leftmost shown, Package41 falling from the second conveyor wheel and leads them with sliding surfaces 46 under the heating device and the pressure jaws, from where they held on the last conveyor 47 by corresponding guide devices and by the slides 46 be discharged.

The gripping devices 29 are with respect to an embodiment based on the FIG. explained. she have tappets 50, which are under the spring tension of the spring 51, on the inner sides run-off rollers 52 wear and provided on their outer ends with rotatably articulated, positively controlled gripping tongs 53 are.

The other embodiment of the gripping devices 29 can be seen from FIG. The tappets 50 point there pivoted on their outer ends U-shaped levers 55, the two legs of the U 57 and 58 connecting web 56 is longer than the height of the legs 57 and 58.

F i g. 7 shows the cross section of the transverse welding station 31, which also rotates on the axis of rotation 26 of the frame. As mentioned above, a transverse welding station 31 is assigned to each gripping device 29 mechanical transmission of the control of the gripping device 29 through the cam 34, the right and left in Fig. 7 are shown. Further to the outside and also to the right and left in the illustration are the F i g. 7 curves 60 for controlling the sealing jaws 61 and the counter jaw 62 attached. The mechanical Coupling takes place via pivot parts 63 and spring-loaded pistons 64. Another Curve 65 is in the left half of FIG. 7, which provides for the control of the cutting knife 32. Above in the middle between the sealing jaws 61 or counter-jaw 62 is the partially preformed tube 5 shown.

The device works as follows:
The tube 5 filled with liquid 22 is drawn tangentially onto the circumference of the folding conveyor wheel 15 in the direction of arrow 36 by the drive of the folding conveyor wheel 15. In the embodiment of the gripping devices according to FIG. 1, the gripping tongs 53 engage the points between the packaging in such a way to the right and left of the later separation point that the packaging on the inside of the circle,

d. H. on their so-called inner narrow walls be folded while shortening the length of the tube 5. You can see from the right half the cam 33, d. H. the right part of the control cam 34, that the grippers longitudinally about 180 ° in

Remain in Ulm Kiummsieiiuiig. The packages are now pulled around in the direction of arrow 36 so that they remain stretched on the outer circumference. The angles and curvatures are set so that proper conveyance can take place in the direction of the circular line.

According to the embodiment of FIG. 4, the webs 56 of the lever 55 grip the inner ones from below narrow side walls of the packaging, so that here, too, the corresponding folding along the intended Fold lines 70 takes place

In Fig. 5 is the cross section of the longitudinally welded, filled and not yet formed packaging or packaging. of the hose 5 is shown.

After the chain-like abutting according to Figure 4 Packagings are conveyed further by about 90 ° in the direction of arrow 36, the result is from 6 shows a cross section of the hose 5 formed on the inside.

At the point 30 shown in Fig. 1 then occurs Cross welding station 31 in operation, d. H. the sealing jaw 61 moves against under corresponding cam control the counter jaw 62, which also moves towards the center, and welds the with liquid filled hose.

Shortly afterwards - also cam-controlled - knife 32 and groove 71 for cutting come into operation, whereby the packagings 41 are separated. Meanwhile, the folding conveyor wheel 15 has continued in Rotated in the direction of arrow 36. After about 180 ° loosens

so the clamping handle of the gripping tongs 53 or the levers 55 move back radially from the folded position inside towards the center of the carousel 15. This means that the individual packaging is open for delivery the second Faltförderrad 28 free. But there is still sufficient contact pressure so that the so-called outer narrow side walls of the packaging are pressed onto the die 38 of the turntable 28. This results in the further deformation of the packaging on its outer narrow side walls. the The turntable rotates in the direction of arrow 37 and conveys the separated packages 41 to Dispensing station 40. Circumferential pressure jaws' 43 glue those that are still protruding, but by customary ones Guide devices folded flaps on the upper

b5 or underside of the packaging 41. The sponsor 47 then derives the finished and filled packages 41.

In addition 5 sheets of drawings

909 520/164

Claims (9)

Claims: yes 1 I. 1. Process for reshaping a continuously moving filled tube into cuboid Single packs with two wide sides, two narrow sides and two end faces as well as of the end faces in the area of the narrow sides protruding triangular lobes, corresponding to the im Fold lines provided for hose material, characterized in that the hose is guided over a curved path in such a way that the one for forming one narrow side of the pack provided hose area of the inner, shorter side of the web and that to form the other The tube area provided on the narrow side of the pack faces the outer, longer side of the web, and that the tube section lying on the inner side of the web along the fold lines is folded in to form the triangular flap, whereupon the tube is welded crosswise and Cutting along the transverse welding lines is divided and then the packs by folding them in the other narrow side can be transferred to a path curved in the opposite direction. 2. Apparatus for performing the method according to claim 1 with longitudinally in vertical planes closed webs continuously revolving forming, cross-welding and cutting tools that grasp a filled tube that can be fed in from above and carry it with you while you enter the path of the Pass through hose determining portion of their path, characterized in that two assigned to each other «, driven in opposite directions, an S-shaped conveyor belt determining conveyor wheels (15, 28) are provided, the rste conveyor wheel as Faltförderrad (15) is formed, being included at one of a certain angle Circumferential section of the folding conveyor wheel (15) for forming one narrow side of the pack (41) provided hose area can be applied, the folding conveyor wheel (15) designed as a gripping device (29) Forming tools and transverse welding (61, 62) and cutting tools (32) and the second Conveyor wheel (28) has forming punches (38) for forming the other narrow side of the packs (41). 3. Apparatus according to claim 2, characterized in that the hose is the folding conveyor wheel can be fed in tangentially and that the peripheral portion of the serving as an abutment for the hose Faltförderrades can be included by an angle of about 250 °. 4. Apparatus according to claim 2 or 3, characterized in that the transverse welding and cutting tools are cam controlled. 5. Device according to one of claims 2 to 4, characterized in that the axes of rotation (26, 27) of the first and second conveyor wheels (15, 28) are arranged parallel to one another. 6. Device according to one of claims 2 to 5, characterized in that a stationary cam disk (33) is attached in the area of the axis (26) of the folding conveyor wheel (15), with the Control surface (34) tappets (50) are controllable in the radial direction, and that the tappets (50) on their outer end of the gripping devices (29) carry. 7. Apparatus according to claim 2 or 6, characterized in that the plunger (50) at their inner Have ends of discharge rollers (52) and at their outer ends a lever (55) is articulated, which in the Cross-section has a U-shaped shape, and that the web (56) of the U-lever (55) has a length which is almost equal to the height of the fully folded packaging (41) and greater than that of the legs (57,58) of the U-lever. 8. Apparatus according to claim 2 or 6, characterized in that the gripping device (29) on the joint (50) rotatably articulated, positively controlled Has gripping tongs (53). 9. Device according to claims 2 to 5, characterized in that there is on the second Conveyor wheel (28) evenly distributed on its polygonal circumference form punches (38) are attached, the length of which in the direction of rotation is equal to the length of the webs (56) of the levers (55).