DE1924109C3 - Process and devices for the production of sacks with a prismatic shape when filled from thermoplastic material - Google Patents

Description

The invention relates to methods and devices for making sacks, in particular Valve sacks, made from tube sections made of thermoplastic material with when full prismatic shape at least at one end of the bag, preferably both ends of the bag.

Previous sacks made of thermoplastic plastic film, which when filled a prismatic Shape at least one sack end, but preferably both sack ends, are difficult in the production. The disadvantage is that this does not work with existing methods and devices are to be produced in large numbers per unit of time, and a further disadvantage is that the weld seams for connecting the base sheets with the triangular folds are often unsatisfactory. Around Eliminating these difficulties and the lack of durability of the welds has been the task of late switched to gluing sacks made of thermoplastic plastic film. Bonding can however, not essentially on a line, but must: i take place over a comparatively large area, so that glued sacks require a great deal of material.

Other proposals are to provide only one weld seam to produce a pronounced bottom. For this it is necessary that the walls of the hose section are of different lengths. the The resulting cutting of the hose sections entails cutting losses.

Previous devices for the production of box sacks are designed to be able to produce only box sacks of predetermined dimensions. If bags of other dimensions are to be manufactured, this is either not possible on the same machine, or extensive c. Retrofitting work can be carried out on a machine over several days.
According to the German Auslegeschrift 1 031 108 is

sum preparing known valve bags made of thermoplastics and their welding to the Dreieckseinschläschen plastic films a method in gene on the carriage opposite and at the same time double-J ₁ where the tube sections are arranged in a direction transverse pelt, where in Weiler Inventions q to its longitudinal direction and in in their middle in a different design, all those on the wagon,
Level than the two ends to be machined for the 5 tool _{sets associated with each hose section w} formation of the pronounced bottom through which the same type and design are actuated synchronously. _st working machine to be guided. However, in order to be able to manufacture sacks of short tools of different types and configurations _m length, the two counter-work is different in terms of time. In order to achieve this inclined to ^ overlying folding devices are arranged one behind the other on the car, ie arranged. Measures bags of different io be able to produce a tube section each associated works _e j length, are not provided. vehicles of the same type and training with a total _UI The tubing sections are processed individually in common drive and interconnected ^ ₁ such that each operation provided correspond drive shafts. Drives in the form of
Accordingly, only one machining tool, which, however, is in hydraulic or pneumatic cylinders for the work _w double design for both opposing tools are on the front of the carriage. Hose ends is present, is assigned. orderly. This does not rule out that part of § _t

The present invention is based on the task drives are arranged in the middle of the car

from, with the same machine tool without and from this drive drive shafts J _n -

Retrofitting sacks of different lengths - extend across the length of the trolley. bä

deliver and to accelerate the sack production ao in a further embodiment according to the invention, Ki

Proposed the same on several hose sections at the same time, that on the trolley each hose fä:

To carry out work. section assigned two suction cups to form Fc

To solve these tasks, triangular stops are arranged in a ver, each

go to the manufacture of sacks, in particular cooperate with a gripper arm in the way, Sti

Valve bags, made of tube sections made of thermo-15 that with the turning of the gripper arm around the r _£

Plastic plastic with driven swivel axis of the suction cups when filled via a on the _re i

prismatic shape is raised at least at one end of the sack, gripper arm existing cam surface, de

preferably both ends of the sack, the hose being de

Sections are pivotable in a direction transverse to their longitudinal. sin

direction and in its center in a different plane than the 30 According to a further inventive feature _s j _n

end to be machined or both to be machined, it is proposed that the sheets ste for prevention

Ends for the formation of the bottom by the processing of welding between Dmeckeinschlag and Sa;

processing machine are carried out, according to the invention in front of hose walls when welding the on-

beaten that the middle area of the tube-laid soil sheets through transversely to the movement nui

Sections in a vertically lying loop and 35 direction existing welding stamps on the car de>

the er.d areas of the hose sections horizontally assigned to each hose section four times

taler level passed through the processing machine and each arranged at the lower end of a shaft Rh

will. that can be rotated and roped when aligned vertically

This solution ensures that it is axially displaceable at the same time. J

same processing machine sacks differ- 40 According to a further inventive feature on

Licher length can be produced without it being suggested that for laying each bottom

the opposite processing tools, starting with the triangular legs, two at a distance

Depending on the bags to be produced, there are different suckers located, each by An

Length, changed in their distance from one another, a parallelogram joint is raised and met in Rieh

would have to. 45 direction to the middle of the wagon across the running direction of the Au:

In a further embodiment according to the invention, hose sections are moved. We

suggested that sine on several in a row according to a further inventive feature

Intervals existing _w transverse to their longitudinal extent ill suggested that for the iJangsschweißung>

kung continuously moving hose sections floor sheets with the stimuli of the hose req

the work on the formation of the floors at the same time pre-50 sections U-shaped heated gutters are present, Rin

be taken. being particularly advantageous in a further embodiment

An advantageous device is characterized trough the invention several heated channels behind

by a carriage, which is a plurality of synchronously arranged with each other, v / obei these channels Hol

tool moved with the hose sections - preferably different heating temperatures geo

Have sets for processing a corresponding multiplicity 55, for example the first channel one mer

having hose sections. lower temperature for warming up, the second a dun

According to a further inventive feature, higher temperature for welding, the third Ges

it is suggested that the carriage with the factory gutter should again have a lower temperature for bin <

kits for a variety of slow cooling to be processed. These channels are in E

Hose sections above the transport path of FIG. 60 at a different distance from the one to be combined

Tubing sections arranged to and fro, adjustable welding edges of the foils. After them

is. The trolley with the tool sets is advantageous - a further inventive feature is shown

haft driven by a circulating chain and suggested that in the direction of movement of the bags F

give away both ends with stop springs. In connection with a heated trough a cooling trough Ver

According to a further feature 65 according to the invention is arranged. It is also proposed that F

it is proposed that each of the one hose connection to a heated channel on the welding bile

Tool sets assigned to section for forming seam-fitting pressure rollers, pressure rollers or under F

the triangular folds, laying on of the base sheets pressure-fitting metallic bands are available ven

Well,

: r d h

il ία h i ix

.ie .te m in

: h rd k'e ne aß ßier Λ.

It is particularly advantageous if a U-shaped, heated channel consists of a metal alloy, in particular Chrome-vanadium alloy.

According to a further inventive feature it is proposed that on both sides of the to be welded Foils in the vicinity of the U-shaped heated channel have hollow cooling strips with a Cooling medium are arranged, which have the task of the radiant heat emanating from the channels to limit a small area of the edge and the remaining areas of the film from the action of heat shield.

According to a further inventive feature it is proposed that in the area of the U-shaped heated grooves to be welded end edges, the foils between circumferential belts are held and transported by these and in the area between the holding and conveyor belts and the U-shaped heated channel from the cooling strips outgoing sheets from hochwärmeleit- ao capable material are present, which extend close to the foils.

The channel proposed according to the invention for front edge welding only needs a small one Space, so that it is possible that after a further as Ren feature according to the invention in the longitudinal direction of the moving hose sections in pairs and in the height offset heated gutters are arranged, the open gutter sides facing each other are, the distance between the channels to each other adjustable is in order to be able to consider different possible widths of the bag bottoms. It will be after However, the invention not only proposed to provide only two channels, but four with them the proviso that the pairs opposite and movable to one another face one another Gutters of the same training at a fixed lateral distance are also available.

Each heated trough or several trough sections arranged one behind the other are after another Feature according to the invention arranged in a housing, which at the same time the cooling strips and Carries drive rollers for the holding and conveyor belts and this housing becomes a housing of the same Training in the vertical plane is movable in such a way that the two housings can be moved relative to one another are.

According to a further inventive feature, the movement of the two takes place, in each case the heated one Channel and the Aindrückrolle bearing housing by assigned screw spindles. Another inventive proposal is that the height adjustment of the heated channels with the associated Cooling bars and holding and conveyor belts of several sub-assemblies in a row by a common drive, in particular in the form of a handwheel with connecting the assemblies Cardan shafts.

The invention is explained in more detail in the drawings using an exemplary embodiment, without it is limited to the exemplary embodiments. It shows:

F i g. 1 shows a tube section for forming a valve box bag in a side view,

FIG. 2 shows a hose section according to FIG. 1 Formation of triangular impacts,

3 shows the placement of the base leaves and base valve leaves on the triangular strokes, Fi g. 4 the sack with bottom sheets in flat condition,

FIG. 5 shows the sack according to FIG. 4 in the filled state,

Fig. 5a shows the front edge welding in connection with a reinforcement strip,

6 shows the method according to the invention in principle and shown schematically,

F i g. 7 to 9 the method according to the invention in a basic representation,

10 and 11 a method according to the invention modified form, also shown in principle,

Fig. 12 shows the device for making the sacks in side view,

FIG. 12a shows the longitudinal beam welding device connected to FIG. 12,

13 shows the design according to FIG. 12a in a view from above,

FIG. 13a shows the design of FIG. 12a in a view from above,

Fig. 14/1 and 14/2 show the middle part of Fig. 12 as a valve and bottom layer in side view and FIG. 12 opposite an enlarged detailed illustration,

15 shows a vertical section through FIG. 12 according to the line XV-XV there;

FIG. 16 shows a vertical section through FIG. 12 according to the local line XVI-XVI,

FIG. 17 shows a vertical section through FIG. 12 corresponding to the local line XVII-XVII,

Fig. 18 is a vertical section through Fig. 14/1 according to the local line XVIII-XVIII,

Fig. 19 is a vertical section through Fig. 14/1 according to the local line XIX-XIX,

F i g. 20 shows a horizontal section through FIG. 14/1 according to the local line XX-XX,

Fig. 21 shows a vertical section through Fig. 14/1 according to the local line XXI-XXI,

Fig. 21/1 and 22/2 the tool trolley according to Figs. 12 and 14 in a view from above,

Fig. 23 shows a vertical section through Fig. 22/1 corresponding to the line XXIII-XXIII there, in Fig. 22/1 opposite an enlarged illustration,

Fig. 24 shows a vertical section through Fig. 22/1 corresponding to the local line XXIV-XXIV, in this Fi g. 22/1 opposite enlarged view.

Fig. 25 is a vertical section through Fig. 22/1 corresponding to the line XXV-XXV there in Fig. 22/1 opposite the enlarged illustration,

F i g. 26/1 and F i g. 26/2 converts the longitudinal welding machine according to Figs. 12a and 13a into one: horizontal section,

F i g. 27 a vertical section through the longitudinal welding machine according to FIG. 13a corresponding to dei local line XXVII-XXVII,

F i g. 28 corresponds to a vertical section through the belt deflection of the longitudinal welding machine the line XXVIII-XXVIII according to Fi g. 26,

29 shows the longitudinal weld in simplified form Depiction.

To produce a valve box sack wire according to FIG. 1, the starting point is a hose section 10o with the hose longitudinal edges 11 and 12. The hose section is cut through transversely obtained from a tube and has the end faces 13 and 14. To form the one shown in FIG Triangle strokes are shown in a known manner in

9 T ίο

Area of the two ends around the assigned FaIt - regardless of the length of the hose sections

lines 15 and 16 the two hose walls and thus the later bags is also essential for

turned over to the outside, with the further stipulation that the bottoms in spite of the fold lines

17 the triangular folds 17a on one sack - possible different widths at the individual ends and 17 Λ on the other sack end - are given 5 sack dimensions to this working width α . As a result, at one end of the bag, like tet graze, because the central longitudinal axes b of the bag-Fig. 2 shows the surface 18 and the bag end tue surface 19 on the other bottom, regardless of the width of the bag bottoms. On these surfaces or the base sheets also on the working

18 and 19 ground sheets are placed as there * are aligned in width α and the working width a ent-Fig. 3 is described by the proviso, speak io.

that a bottom sheet 20 with the longitudinal edges 21 and The sagging of the central areas of 22 and its transverse edges 23 and 24 in the manner of tube sections according to FIG. 6 is placed in a horizontal plane that the longitudinal edge 22 aligned with the longitudinal plane triangular notches and in edge 26, the longitudinal edge 21 with the longitudinal edge 25 of the horizontal plane to be placed floor sheets in alignment with the transverse edge 23 laterally outwards brings the advantage that , as shown by a knife over the edge 27 of the triangular notch and 37 on the right outside, also two sacks finally the transverse edge 24 can also be produced laterally at the same time, with these outside offset over the edge 27 of the other three-sacks, however, only with a pronounced soil insect impact is brought to the plant. Then are seen. It is understandable that the sagging follows through weld seams 30, 31, 32 and 33 connecting the central areas of the hose sections with this, as shown in FIG. 4 shows. The two bottom-a simple way allows, specifically with any sheets 20 and 20 a are obtained from strips of length of the bags to be produced. With this type of by cross cutting. If, as shown in FIG. 3 above, sacks that only have a pronounced base, the sack is equipped with a valve sheet, it can be a base with a valve, and another one with the strips, but also without Act valve.
Valve-forming strip 34 fed to the through this design is made possible that. like the transverse edge 24 of the bottom sheet 20 outwardly before subsequently in connection with FIGS. 7 to 9 and stands. The valve sheet is only part of the length, also 10 to 11 will be described later, more of the base sheet. The Querabtrennen done with _r ere tube sections at the same time the same Beeinem Glühband, so that, with the separating cut can be subject to processing obligations 30 a. The Fie. 7 to 9 welding of the two foil layers at their _ze j _g s this schematically. With the Roman numbers that take place with cut edges and thus a base sheet is surrounded by a circle, the individual 2 (1 and valve sheet 33 adhere to one another and are commonly referred to as hose sections,
sam be fed to the hose section. At F i g. 7 shows twelve tube sections, the connection speed to be moved takes place in the other embodiment of the valve bag ₃₅ through the given direction of the arrow 36 continuous with eleicher Querabschweißung 33 in FIG. 4. Above the first only the valve sheet 34 with the triangular _{fold s} j _e ben tube sections is the processing carriage 17rt, while the transverse edge 24 of the bottom sheet 20 3g, which is provided with rollers 39 is arranged. represents the valve opening. For this purpose, transverse cut-offs run on rails. "The" carriage 38 has a recess 33 and the edge 24 of the bottom sheet as 40 length X. which is dimensioned so that it is thus laterally offset after the valve opening. It can also guide, for example in the F be present ig 7 to 9 seven hose Yet another valve sheet, covered with portions, which between themselves then with the cross-Kant = 24 have a Abdessen transverse edge of the _sta nd, wherein the distance small flush its valve sheet as possible, in which case is the two edges _so] i, _a b _he so dimensioned that the hose also be welded. It is then advantageous to edit 45 sections of different widths, the edge of the valve sheet around the edge 24 of the can. Turn the distance between the hose section bottom sheet. _th is dimensioned with so that mgt large widths c Fig. 6, that of a tube 10, the 6 low and this at lower slurry Schlauchabschni.te 10a, 10b and 10c by cross-th c this is large in FIG.. Here, too, the middle cuts are cut off, so that the 50 lines are assumed in order not to have the distance between the factory hose ends 13 and 14. The kits have to be changed with each other provided that the hose is first produced in the direction of the arrow, bags of other dimensions are to be produced

35 transported, and on this path of movement the carriage 38 carries seven tool sets 40a to the hose sections by transverse cutting 40 _g . being a single set of tools all to the formed. Subsequently, the Schlauchab- 1 55 Fig. 5 described to work carried out to sections at right angles in the given direction of the arrow _o f the longitudinal welds 30 and 32, in a

36 led away. ._.... _ ,. "Downstream device can be carried out. Fi g. 6 shows in the right part schematically the line. Each hose section 1 to 7 is therefore a special

sequence of the tool set assigned to a hose section after which a tool

Fig. 1 to 5 described processing, each S _{0 sentence} is in turn subdivided into two side by side

but Fig. 6 is not to be understood in the manner of Hegjnde groups, one group being the one in

that the individual, successive work- F i g. 2 illustrated bottom 18 and the other group

can only be carried out on one sack at a time. also shown in FIG. 2 bottom 19 shown loading

In order to always get the same working width α , works.

which at the same time results in the space-saving arrangement of the 65. According to FIGS. 7 to 9, the hose tools are moved along the processing unit 36 in a confluent manner in the indicated arrow direction in their center. The carriage 38 is supplied in Fig. 7 in its witnesses. This always the same working width α is shown in the initial position, also migrates to

Ί 924 109

indicated arrow direction 36 at the same speed as the hose sections and finally reaches its end position, which is shown in FIG. 8 is shown after he has covered the movement distance y. Is advanced within the time in which the carriage in synchronism with the tube sections and the movement distance y travels are g by the tool sets 40 'and 40 to each section of tubing associated with the procedures in Fig. 1 to 5 carried out up to the aforementioned longitudinal welds 30 and 32. However, the tool sets do not cut the bottom sheets 20 and 20 a with the valves 3- from the webs, because this is done at a station 41 in the form of a cut-off welding machine, which in the cycle that corresponds to the sequence of the individual hose sections, each Tubing section adds the bottom sheets so that these bottom sheets, which migrate with the tube section, are placed on the pushbuttons by the tool sets, provided that the bags according to FIGS. 1 to 5 can be produced. If, however, sacks are to be produced which do not have separate bottom sheets, but in which the base sheets are integral with the sack, then a base sheet feed station 41 is not required, but a different station to cut the tube sections 10, 10a, 10b etc. accordingly. This is then expediently done in conjunction with the transverse severing cut in order to sever the individual hose sections from the hose.

As soon as the carriage 38 has reached its position in FIG. 8 has reached the end position of its movement and thus the work described above has been carried out, it is carried out at the same speed as it is in indicated arrow direction 36 was moved, moved back. The movement is advantageously carried out by a revolving chain, taking into account that the carriage at the beginning and at the end of its movement path must be braked accordingly and accelerated again. Braking and accelerating takes a time that corresponds to the time that a hose section needs to cover the distance as the distance from the middle of the hose section to the middle of the hose section to put back adjacent hose section. Braking and accelerating the car at the End positions therefore only take a short time and can lead to the viewing of the F i g. 7 to 9 can be ignored.

F i g. 9 shows the return movement of the carriage 38 in the indicated arrow direction 42, to be precise when it is reached the end position that corresponds to the starting position according to FIG. 7 corresponds. During the time of the return movement of the carriage 38 with the tool sets disengaged, the hose sections migrate continue in the indicated arrow direction 36, at the same speed mentioned above, which is always is unchanged. This does not rule out that depending on the thickness of the film material to be processed in the case of thin film material, the hose sections and, accordingly, the carriage as well, more quickly and continuously are moved than with thicker film material to be processed, because the speed the advancement of the tube sections is adjusted depending on the time it takes for it the Wp.rlc7eiiesätze assigned to the individual hose sections can carry out their work.

Fig. ¹ ) shows, as shown, that when the carriage 38 is moved again in the indicated arrow direction 36, the tool sets 40 a to 40 g described above now capture the next seven hose sections, namely the hose sections with the numbers 8 to 14 surrounded by a circle 9 shows in the right part that the hose sections 1 to 7 have already been completely machined and are fed to the downstream longitudinal welding device for making the longitudinal welds 30 and 32.

The in the F i g. 7 to 9 described sequence of movements is repeated continuously. The invention is thus characterized according to FIGS. 7 to 9 by the continuous, uniform movement of the hose sections with a reciprocating carriage, this carriage except for its reverse motion is also moved at the two end positions at the same speed as the

ao hose sections are moved. This results in an even, continuous sequence of movements, which is very easy to control and also to correct. Since the car 38 is from a is driven at the same speed orbiting chain, is also the movement of the reciprocating The car can practically be described as continuous.

However, Fs is also different from the basic representation in FIGS. 7 to 9 possible that the Carriage 38 according to FIGS. 10 and 11 arranged in a stationary manner is. According to the exemplary embodiment, this carriage also carries seven tool sets 40 a to 40 j? for the simultaneous processing of seven hose sections, which are also linked to those of a circle surrounded numbers are shown. When working according to FIGS. 10 and 11 are after Exemplary embodiment, seven hose sections each run intermittently under the tool sets 40o to 40 g. They stay there within the time it takes to get to the F i g. 1 to 5 except for the Work to be carried out in the longitudinal direction has been carried out. Then they will be for the Longitudinal welding of the prepared hose sections moved away at the highest possible speed, and at the same time the next group of seven hose sections will be used with the tools fed at the same speed. Then the tool kits kick. assigned to each hose section, in action. Figures 10 and 11 thus show a discontinuous supply of groups of hose sections. During the time the Tool sets 40a to 40g are in operation, the next hose sections can also be continuous migrate so that each individual hose section through a common separating welding device prepared base valve leaves or the soil leaves can be added.

FIGS. 10 and 11 consistently show mi the F i g. 7 to 9, that a group of hose sections are assigned according to their number « Tool sets are available, all of which are in action at the same time and thus a multitude of voi Hose sections are subject to the same processing, with the tool sets again are divided into individual tools that carry out the work on each individual hose section ren, which in principle to the F i g. 1 to 5 have been described.

can be seen in particular from FIG. These are in principle formed in the same way as the lower chains 46 and 46 a. In order to achieve sufficient pressure on the hose sections between the aforementioned transport chains 46 and 54 or 46 a and 5 54 α , the adjacent chains are supported on longitudinally extending rails, so the chain 46 on the rail 55 and the chain 46 a on the rail 55 a, the chain 54 on the rail 56

The F i g. 7 to 11 show seven tool sets for the simultaneous processing of seven hose sections. It should be understood, however, that more or less tool sets for processing a corresponding number of hose sections can be present. Provided more than seven tool sets are available, the productivity and thus the production of bags per unit of time

improve. However, it has been found that ..

advantageously not less than four hose sections ic and the chain 54a on the rail 56a. After short

should be processed at the same time. The distances that are initially upwards are favorable.

eleven tool sets for the simultaneous processing of curved hose sections according to FIG. 15

eleven bags. brought down to the slack, as the fig. 16

The device for making sacks with shows, through one in its inclination 12 there is essentially 15 the lockers! 57 adjustable via pivot axis 58

The first device 43 is made up of two parts in a cash tube 59.

of the hose sections with their pronounced around the hose sections the following

Soils are provided, and the second section _Z \ x descriptive tools in precise alignment

44, to which the longitudinal beam welding device is to be fed, the edges are optionally represents to cut the longitudinal welds 20 shown in FIG. 5, namely by cutting knives 60 and

ßungen 30 and 32 to produce. 61, the counter blades 62, which are assigned to each other

The first device 43 is subdivided into an input and 63 interact. Koa.ia! in addition or also

barrel, an embossing and cutting device, a ven- behind are embossing rollers 64, <> 5 available, which are

til- and base plate for the transfer point as well as the tig provided with a groove on its outer circumference Valve and bottom layer assembly, during which are 25. These work together with the respectively assigned

second part 44 of the device is subdivided into a Neten counter rollers 66 and 67, which are fed into the aforementioned strip feed to reinforce the longitudinal welds 30 and 32 and various heating zones and
a cooling zone.

The enema, which is also discussed in detail in 30
connection is described with Fig. 15 begins with
two spaced, in the indicated arrow direction 45 revolving chains 46, which by the
Chain wheels 47 and 48 are deflected, with the chain wheel 48 preferably being the top view from FIG. 13 results, arranged from two overall devices 43, is driven. Cut-off welding machines 72 and 73, the cut-off welding machine 72, which is arranged side by side, consists of an unwinding port chain thus extending over the entire block 74 with the supply roll 75, from which the bottom length of the first part of the device 43. On the leaves be separated. The bottom sheets are, both chains are present, drivers 49 and 49a 40 as described for FIG Part is rolled up. The flat track 20 a is F i g. 6 shows, guided by the processing machine transversely over film compensating oscillators 76, so that they can be transported to their longitudinal extent to detect known movement compensation between their constant rearward edges. The unwinding 45 and the section-wise cutting-off proposals 49 are thus drivers that are at the same time the hands. With 77 and 78 a pair of feed rollers is to be aligned with hose sections. denotes, which via a drive known per se. The hose sections 10a, lOfc, 10c, which is driven transversely to 79, so that the film 20a is moved about its longitudinal extent, reach the width of the bottom sheets in increments next to a carrier 50 in Shape one in the 50's.

Central longitudinal axis aligned Ronres, there? The bottom sheet 20a is cut by a knife 80 that or several screw spindles 51 in its inclination in connection with two clamping jaws 81 and 82 or height is adjustable. Thereby the works, as well as continue to be in connection with one Hose sections by their support on the tube counter support 83 in the individual bottom sheets below aligned in such a way that it divides 55 on both sides, with a photocell in addition for control the support through the tube 50 downwards, which sag with print marks on the film, as shown in FIG. 15, and thereby cooperates with, can be present with the at both ends of the chains 46 and 46 a reference numeral 84 is provided. The cut off lie, which are designed as a link chain and on bottom sheet 20 a is aufihren on a conveyor belt 85 outwardly lying surfaces on which the 60 is placed and from this parallel to the tube foils fit, are rubberized. Sections and at the same speed as Double link chains available. The chains 46 and these moved, with the bottom sheets being associated with the 46a are also shown in FIG. The two tube sections also cut out accordingly each hose section lie on rails are directed. Around the ground leaves at their distance so that the end 13 is aligned with the rail 52 and the other 65 with the edges of the hose section,

Have grooves engaging circumferential projections. These embossing rollers have the purpose that is shown in FIG. 1 prepare the folding lines 15 and 16 described.

The pivot tube 59 is arranged within a tunnel 68, wherein in FIG. 16 the two side walls 69 and 70 of this tunnel are visible. The valve and Bocienblatt takeover 71 is in detail shown in FIG. It consists, in particular

Opposite end on rail 53. In one
adequate distance to the two lower chains
46 and 46a start upper chains 54 and 54j. the

but also about them with regard to the later suction gripper device to align on the work carriage, a stop 86 is provided, which in its distance

is adjustable to the central longitudinal axis of the device in order to take into account different widths of the floor sheets, as long as bags of other dimensions are made.

In principle the same way, the bottom leaves are fed in, which are each provided with a valve leaf or two valve leaves, as is the case in principle with FIG. 3 has been described. The supply roll 87 gives the bottom sheet 20, the supply rolls 88 and 89 produce two valve sheets, whereby, as shown in FIG. 3 shows that only one valve leaf can be attached. The valve leaves are not as long as the base leaves, as is also shown in FIG. 3 emerges. The rest of the arrangement with film compensating vibrators and feed rollers corresponds to the training on the left, but with the proviso that no cold knife 80, which is only intended to cut, but a glow tape knife 90 is used, because at the same time as the cut, the cut two or direi foils are used their cut edges are welded and thus their position to one another is secured. This is a major benefit. The bottom sheets 20 with a valve sheet 34 or two valve sheets are also placed on a conveyor belt 91 , which is continuously moved at the same speed as the conveyor belt 85 on the other side. The transport chains 55 and 56 described for FIGS. 15 and 16 on the one hand and 55 a and 56 a on the other hand are not shown in the drawing in FIG. 17 for the sake of simplicity. It is also shown that the ends of the hose sections are carried by associated conveyor belts 92 and 93. 17 also shows the carriage 94 visible above the longitudinal conveyor belts, which is moved back and forth on rails 95 and 96 via assigned rollers 97 and 98 , this carriage 94 not until later in connection with FIGS. 14/1 and 14 / 2 is described. The carriage shown in side view in Fig. 14, which is mounted on the rollers 98, 98 a, 98 ft and 98 c visible in this drawing, is driven by a chain 99 rotating at the same speed, which is driven by the pulley 100 and through the pulley 101 is deflected. The chain has a pin 102 protruding in a horizontal plane, which engages in a link 103 which represents a slot in a plate 104 to which the carriage 94 is movably attached. Through the chain 99 rotating at the same speed, the carriage is thus moved in the right direction and with the deflection by the pulley 101 back in the opposite direction, with the exception of the areas of the deflection, the carriage is moved at a speed that corresponds to the speed of movement of the Corresponds to hose spacing. The carriage has seven tool sets A, B, C, D, E, F, G assigned to each hose section. The design and mode of operation of the tool sets is described below in connection with FIGS.

Fig. 18 shows the design around the hose sections according to FIG. 1 in the form of FIG. 2, first attaching the two layers of film the ends of the hose sections must be lifted off together.

In the range of movement of tool carriage 94 of the vorbeschrieberien conveyor belts 92 and 93 present stationary support rails 105 and 106. Above are in prolongation of these fixed rails are hollow rails 107 and 108 are provided which are attached to the carriage and have a distance to the aforementioned rails 105 and 106 which is dimensioned so that the two film layers of the tube sections can slide on the fixed rails 105 and 106. Below the ends of the tube sections are assigned suction boxes 109 and 110, over which assigned suction belts 111 and 112 run , on which the higher ends of the tube sections then rest. The purpose of this arrangement is that the lower film layers of the ends of the hose sections are to be held on the associated conveyor belts 111 and 112 by means of suction air. The upper film layers of the two sack edges are lifted by respective associated suction cups 113 and 114, the left part of the drawing showing its arrangement

ao when lifting the upper layer of film and the right-hand part shows the arrangement after the work has been completed. The following reference symbols relate to the left-hand part of the illustration.

The sucker 113, usually made of rubber, has a

Extension rod 115 which is articulated on a pivotable Hebei 116. In its lower area it is also articulated to a lever 117. The arrangement is actuated by a shaft 118. With its pivoting in the indicated arrow direction 119 towards the center of the device, the lever 116 slides on a cam surface of a cam 120 and thus lifts the sucker 113 via the rod 115, which lifts the upper film layer takes with it, the lower film layer being held in place by the suction belt 111 described above. With the pivoting of the lever 121 inward, a gripper 122 arranged at its lower end engages between the two layers of film, and with the further pivoting inward, the end of the hose section is placed in the position on the upper side of the hollow box 107 , as shown in FIG. 2 is shown. In order to hold this position, hold-down devices shown in FIG. 14 are provided, which can be pivoted about horizontal axes. The tool set B according to FIG. 14 shows the hold-down devices 123 and 124 in action, while the adjacent tool set C shows the hold-down devices 123 and 124 out of action. It should be noted, however, that all the individual tools of the seven tool sets always work synchronously and the various spatial positions in the aforementioned tool sets B and C have only been shown in different positions for the purpose of explanation.

Fig. 19 shows in connection with Fig. 20 format

Sheets that are inserted into the triangular notches. The left part of FIG. 20 shows the extended format sheets 125 and 126, while the format sheets 127 and 128 are retracted between the triangular insert and the film layer. Here, too, the representation of different positions is only for the purpose of the basic mode of operation.

The individual format sheets are arranged on a rod 129, with the interposition of a spring 130, so that they rest elastically. The rod 129 is rotatable and axially displaceable. For its rotation it is provided at its upper end with a bevel gear drive 130, 131, while its axial displacement is achieved by a gear

609 617/105

132 in connection with an existing on the rod 129, provided with radial teeth unilaufender sleeve 133. The bevel gear 131 is axially displaceable.

After the triangular fold has been formed and the format sheets have been retracted, as FIG. 21 shows, the base sheets are placed on one end of the tube sections and the base sheets, which are also provided with the valve sheets, on the other end. In order to achieve this, a suction device 134 is assigned to each bottom sheet at its front and rear ends, which are attached to a parallelogram joint 135, 135 a, 135 b , the drive being effected by a shaft 136 . When it is rotated in the indicated arrow direction 137 , the bottom sheet is lifted from the conveyor belt 85 by the suction device and placed on the triangular fold and the measure is thus carried out, which is shown in FIG. 3 of the drawing is shown. 21 shows in the left part the lifting of the bottom sheet from the conveyor belt 85 and in the right part the transfer of the bottom sheet, which is also provided with a valve, to the triangular fold. FIG. 21 also shows that a belt 138 holding the floor sheets runs with the conveyor belt 85, but the belt 139 can be lifted off in order to release the floor sheet with the valve sheet between the two belts 5 * 1 and 139 .

Figs. 22/1 and 22/2 show the carriage 94 carrying the tool sets in a top view. The carriage is formed with the rollers 97 on one side and 98 on the other side, the rollers 97 having a different configuration than the rollers 98. At the ends of the carriage is formed with two buffers 140 each which, in conjunction with sliding line springs 141 , ensure that the reversing movement of the carriage is facilitated in such a way that the buffers brake the carriage and, after it has come to a standstill, move it back in the opposite direction, see above that thereby the chain is relieved and the braking energy is used to accelerate the car in the opposite direction.

The top view of the carriage according to FIGS. 22/1 and 22/2 shows the seven tool sets and also that these are connected to one another by shafts which are driven by hydraulic cylinders. The majority of the hydraulic cylinders for driving the shafts in order to carry out the above-described sequences of movements of the individual tools of the tool sets are present on one end face in a receiving space 142, FIG. 25 shows the drives. The two hydraulic cylinders 143 and 144 according to FIG. 25, which are both pivotably articulated on a bar 145 , each actuate the bottom opening via associated shafts 118 and 118 a, as is described in detail in FIG. 18.

The two hydraulic cylinders 146 and 147, which are also jointly articulated to a beam 148 , actuate the welding dies 151 and 152, shown in FIGS. 14/1 and 14/2, via associated shafts 149 and 150, which fasten the transverse welds 31 and 33 for fastening of the base leaves or base valve leaves at the triangular impacts, as shown in FIG. 4. The welding stamps 151 and 152 are resiliently mounted by means of associated helical springs 153 and 154 in such a way that they rest initially with low pressure and then with greater pressure on the foil supports to be welded.

The hydraulic cylinder 155 actuates the shaped sheets ip shown in FIG. 19 via the shaft 156 in such a way that they are raised and lowered via the gears shown there. However, the forming plates are turned by other hydraulic cylinders, which are described below.

the. The two hydraulic cylinders 157 and 158 actuate the shafts 136 and 136a to raise and lower the suction heads 132 and 132a, which are also shown in FIG. 24 and are provided with the aforementioned reference numerals. They are particularly in

their mode of action shown in Fig. 21 and, as described above, serve to the ground sheets or to lift off the base valve leaves from the conveyor belts 85 and 91 and place them on the To transfer triangular inserts.

The turning of the shaped sheets 126 and 128 according to FIGS. 19 and 24 takes place via hydraulic cylinders 159 and 160 according to FIG. 23, which rotate the rods 129 and 129a according to FIG. 19 via respective associated shafts 161 and 162. These hydraulic cylinders are not arranged on the front side of the trolley, but, as can be seen in particular from Fig. 22/1, in the middle of the trolley. The shafts 161 and 162 rotated back and forth by these via rocker arms extend over the entire length of the trolley, as can also be seen very clearly from FIGS. 22/1 and 22/2.

The hydraulic cylinder 163 also shown in Fig. 22/1 and 23 is actuated via the rocker arm 164 and the shaft 165, which also extends over the entire length of the tool trolley and can be composed of several parts in the same way as the aforementioned shafts 161 and 162 , the flaps 123 and 124 assigned to each tool set for holding down the triangular notches, as has been described for FIG. 14.

The longitudinal welding device according to FIG. 12a

and i 3 a consists of several subsections H, I, K, L, M, N and finally the sack tray O. The subsections H to N are thus assemblies of the same basic training and essentially the same other training, but with slight modifications in this way are that the heating temperatures of the welding channels are or can be different in the individual assemblies.

The hose sections with attached bottom sheets at one end and bottom valve sheets at the other end are passed through the longitudinal welding device A to N in the manner shown in FIG. 27 is shown, with the proviso that the ends of the tube sections with the floor sheets are directed vertically. The hose sections c migrate continuously through the longitudinal welding device. The longitudinal welding device consists of the channel-shaped welding channel shown in principle in FIGS. 5a and 29, which consists of a chrome-vanadium alloy, but can also consist of other metallic or other building materials that can be heated by resistance heating.

This channel 167 , shown in principle in FIG. 29, has both electrical connections 168 and 169. The ends to be welded on the film layers are continuously heated by this channel

157 out and welded to it. To the heat to exclude other foam areas, Khlli

jgfluss a

remain hollow cooling bars 170 and 171 present, by a flowing gaseous or liquid medium, the foil layers m direct connection to the welding seam 30 and 32 respectively to ρ ig. 4 keep cool.

ρ; g_ 27 shows a modification of FIG. 29 training, that a total of four welding channels 167,1ο7 «, 167ö and 167c are present, these welding channels opposed in groups and thus the channels 167 and 167 "each other with their open Sides opposite. The same is true for the neighboring group of grooves 167f> and 167c the case. The cooling bars 171 and 172 are different from those in FIG pig. 29 arranged with the proviso that they are arranged next to the welding channel 167. Of the Cooling strips go from sheets 173 and 174, which adjoin the film layers right up to the from to restrict the heat emanating from the welding channel 167 to the area of the front edges to be welded and to shield the other areas of the film from heating. Should be shielded through these sheets 173 and 174 the conveyor belts 175 and 176 as well. As shown in FIG. 27 can be seen such a pair of conveyor belts is assigned to each longitudinal welding channel. The conveyor belts are pressed against one another by rollers 177 and 178 so that they hold the film layers between them. the Pressure rollers 177 and 178 can also be seen from above from FIG. 26 and 26/2. The total four existing pairs of conveyor belts are driven by associated pulleys 179 to 186, like that from FIG. 28 is apparent. These in turn are driven by coaxially attached Pulleys, which are also from FIG. 28 emerge.

Fi g. 27 shows that the welding troughs 167 and 167 a on the one hand and the welding troughs 167 b and 167 c on the other hand are adjustable in their spacing from one another. This is done using appropriately assigned handwheels 187, 188, 189, 190 with spindle drive, the arrangement of the welding trough 167, the arrangement of the cooling troughs 171 and 172 and the associated pressure rollers 177 and 178 with the V-belt each being within a housing 191. Each housing is axially displaced in its entirety by the assigned handwheel. F i g. 27 shows in the left part the two housings that are at a greater distance from one another, and in the right part the two housings that have a smaller distance from one another.

It is also provided, although not shown in the drawing, that each channel 167, 167 a, 167 b and 167 c is again adjustable in its distance from the edges of the foils to be welded within the housing by a small amount. Furthermore, the measure is provided that the individual sections A to N have a different temperature of the welding channels in such a way that the channels in section H have an initially low temperature, the channels in section J an increasing temperature, the channels in section K. the previous section and the following channels in sections L, M and N have lower temperatures. This measure simplifies welding.

F i g. 26 also shows the measure that between the individual sections at the longitudinal welds 30 and 32 according to FIG. 4 adjacent pressure rollers 192, 193 are present, which pinch off the weld seam and thus press the interconnected foils against the weld seam.

Furthermore, in the last section N of each weld seam, there are encircling cooling belts 196, 197, 198 and 199 which are attached to each weld seam and which are deflected via assigned disks 200, 201, 202 and 203 with corresponding disks at the other ends. The cooling belts consist of steel belts that are pressed against the weld seam by means of associated pressure rollers 204 and 205.

The last section O shows a sack tray in such a way that the sacks are removed from the top conveyor belt 175 and 176 on one side and 175 and 175 b to be knocked out on the other side. The punch 206 is driven by a hydraulic or pneumatic cylinder 208.

F i g. 5 a shows the further solution according to the invention, that over the edges of the foils to be connected to one another a U-shaped reinforcing strip 209 is pushed by the radiant heat of the welding channel 167 with the edges of the foil layers is welded, with the front edge welding a welding of this reinforcing strip 209 to the front edges only in the area of the Edge zones of the film layers takes place. No welding takes place on those facing the middle of the sack Edge zones 210 and 211 of the reinforcement strip 209, so that these edge zones are the films of the sack protection.

Fig. 3a shows a modification of the base valve sheet in such a way that two valve leaves 34 and 34a are present, the valve sheet 34 a welded at the front flush with the edge of the base sheet and connected to this by a weld 33 a. Either the front edge of the valve sheet 34a overlaps the base sheet 20, as is shown in FIG. 3 a is shown, or the edge of the bottom sheet overlaps the valve sheet 34a. With the Querabtrennen the foil webs by a hot blade are also the cut edges by Schweißun- <? S 30 α and 32a connected.

For this purpose 22 sheets of drawings

Claims (31)

Patent claims: 1. A method for producing sacks, in particular valve sacks, from tube sections made of thermoplastic material with at least a prismatic shape when filled one sack end, preferably both sack ends, the tube sections in one direction transversely to their longitudinal direction and in their center in a different plane than the end to be machined or guided both ends to be processed to form the bottom through the processing machine are, characterized in that the central area of the hose sections in a vertical loop and the end areas of the hose section in a horizontal position Level can be passed through the processing machine. 2. The method according to claim 1, characterized in that several in a row in Distances existing, transversely to their longitudinal extension continuously moved hose sections the work on the formation of the soils is carried out at the same time. 3. Device for performing the Ver as drive according to claims 1 and 2, characterized by a carriage that has a plurality of tool sets moved synchronously with the hose sections for processing a having a corresponding plurality of hose sections. 4. Apparatus according to claim 3, characterized in that the carriage with the tool sets for a large number of hose sections to be processed above the transport track the tube sections is arranged to go back and forth. 5. Apparatus according to claim 3, characterized in that the carriage with the tool sets driven by a circulating chain (99) and with stop springs at both ends is provided. 6. Apparatus according to claim 3, characterized in that each of the tool sets assigned to a hose section (A, B, C , etc.) for forming the triangular folds, placing the bottom sheets and welding them to the triangular folds on the car are arranged opposite and at the same time double. 7. The device according to claim 3, characterized in that all of the existing on the car, each hose section associated tool sets of the same type and training operated synchronously are. 3. Apparatus according to claim 3, characterized in that the one behind the other on the car arranged tools of the same design assigned to each hose section a common drive and interconnected drive shafts are provided. 9. Device according to claims 6 to 8, characterized in that the drives for the Tools in the form of hydraulic or pneumatic cylinders are arranged on the front side of the carriage (94). 10. Device according to claims 7 and 8, characterized in that some of the drives for the tools are arranged in the middle of the carriage and from this drive itself Drive shafts extend the length of the cart. 11. The device according to claim 3 and one or more of claims 4 to 10, characterized characterized in that two suction cups (113) are assigned to each hose section on the carriage Formation of the triangular folds are arranged, each of which interacts with a gripper arm (121) in such a way that with the rotation of the gripper arm about the driven pivot axis the sucker is raised over a cam surface (120) on the gripper arm, with sucker (113) and gripper arm (121) are pivotable about the drive axis (118). 12. The device according to claim 3 and one or more of claims 4 to 11, characterized characterized in that the metal sheets (126) prevent welding between triangular notches and hose walls during welding of the applied base sheets through welding belts that are present transversely to the direction of movement (ISl) on the carriage (94) are assigned four times to each hose section and each at the lower end of a shaft (129) are arranged, which when aligned vertically is rotatable and at the same time axially displaceable. 13. The device according to claim 3 and one or more of claims 4 to 13, characterized characterized in that for placing each bottom sheet on the triangular folds two at a distance located suction cups (134) are available, each by a parallelogram joint (135) raised and moved in the direction of the center of the carriage transversely to the direction of travel of the hose sections are. 14. Device for carrying out the method according to claim 1, characterized by a first device in which the tube sections are grasped in the region of their two ends by respectively assigned belts (49, 49 a) and transported by them, the central areas of the tube sections ( 10 a, 10 b etc.) are pressed down by an obliquely directed rod (59) to sag, then embossing rollers (65, 67) and possibly cutting blades (61, 63) are available for trimming the tube sections, then to both Sides of the device are feed devices for the bottom sheets (20, 20 a) and conveyor belts (85, 91) that carry the bottom sheets and rotate at the same speed as the conveyor chains (54, 55) that carry the tube sections. 15. The device according to claim 14, characterized in that the tube sections (10 a, 10 b, 10 c , etc.) are held in the region of their ends between conveyor belts or conveyor chains and the ends of the tube sections are held on associated, circumferential suction belts (111, 112) rest. 16. The device according to claim 15, characterized by adjustable stops (52, 53) in the horizontal plane, at which the ends (13, 14) of the hose sections as well as further adjustable stops (86, 86 α) in horizontal Eb <; ne, where the bottom sheets rest with one long edge. 17. A device for carrying out the method, in particular according to claim 1, characterized in that U-shaped heated channels (167) are provided for longitudinal welding of the base sheets to the end edges of the tube sections. 18. The device according to claim 17, characterized in that a plurality of heated channels (167) are arranged one behind the other, preferably with different heating temperatures. 19. The device according to claim 17, characterized in that a plurality of heated channels (167) arranged one behind the other are adjustable at a different distance from the edges of the foils to be welded. 20. The device according to claim 17, characterized in that in the direction of movement Sacks a cooling trough is arranged in connection with a heated trough. 21. The device according to claim 17, characterized in that pressure rollers (192, 193), pressure rollers or metallic strips (198, 199) resting under pressure are present in connection with a heated channel on the weld seam. 22. The device according to claim 17, characterized in that the U-shaped heated channel (167) consists of a metal alloy. 23. The device according to claim 22, characterized in that the cross-sectionally U-shaped The heated channel is made of a chrome-vanadium alloy. 24. The device according to claim 22, characterized in that hollow cooling strips (171, 172) with a cooling medium are arranged on both sides of the foils to be welded in the vicinity of the U-shaped heated channel. 25. The device according to claim 24, characterized in that in the area of the end edges to be welded by the U-shaped heated grooves, the foils are held between circumferential belts (175,176) and transported by them and in the area between the holding and transport belts and the U-shaped heated channel (167) from the cooling strips (171, 172) extending sheets (173, 174) made of highly thermally conductive material are present, which extend close to the foils. 26. The device according to claim 16, characterized in that in the longitudinal direction of the moving tube sections in pairs and offset in the height of heated channels (167) are arranged, the open channel sides are facing each other. 27. The device according to claim 26, characterized in that the distance between the welding channels (167) is adjustable to one another. 28. Device according to claims 26 and 27, characterized in that the pairs of opposing and mutually movable, facing welding channels (167) are additionally present in 'the same design at a fixed lateral distance. 29. The device according to claim 28, characterized in that the opposing heated grooves (167) are arranged in a housing (191) which at the same time contains the cooling bars (171, 172) and the drive rollers (177. 178) for the holding and conveyor belts carries and this housing to a housing of the same design in the vertical plane is movable in such a way that both housings are movable to each other. 30. The device according to claim 29, characterized in that the movement of the two housings (191) , each carrying the heated channel (167) and the pressure rollers, is carried out by associated screw spindles (187) . 31. The device according to claim 30, characterized in that the height adjustment of the heated troughs (167) with the associated cooling strips and holding and conveyor belts of several modules (H, J, K , etc.) present one behind the other by a common drive, in particular in the form of a handwheel (187) with the cardan shafts (212) connecting the assemblies.