EP4375204A1 - Method and device for producing a filter bag for hot beverages - Google Patents

Abstract

The invention relates to a method for producing a bag (20) for hot drinks formed by folding, wherein the uncut thread (92, 93, 113, 126, 135, 138, 139) extending from the thread roll (91) is transported together with the label (81) linked by thread loops to a station (9) of a central turret (13), in which it is looped around the bag.

Description

The invention relates to a method for producing a filter bag formed by folding without heat sealing by connecting a thread to a label and a bag. An essential task of the method is to be able to adapt to changed or expanded specifications by making minor changes.

Cited patents on the state of the art

1. 1 . DE 1 001 944 B
2. 2. DE 2 027 167 B
3. 3. EN 10 2018 101 570 A1 = EP 3 527 501 B
4. 4. DE 196 19 518 A1
5. 5. EP 2 607 247 A1
6. 6. EP 2 366 628 A1
7. 7.

Machines for the production of double-chamber bags ("filter bags") with thread and label are realized based on two different basic ideas (process categories).

During the manufacturing process, many tasks occur that are processed in assemblies or outsourced. The solution approaches underlying an assembly are often adopted by other machines or even used in both process categories in a different arrangement.

Both process categories have in common the production of the filter bag preform itself: First, the filling material is placed in piles on a flat filter paper web. Then the filter paper web is wrapped around the The heap is formed into a flat, endless, closed tube. The front part of this is cut off to the required length and formed into a filter bag preform with its typical bottom fold. Further processing is usually carried out in stations on another central turret.

This is now the dominant state of the art, which has been adopted in practically all known processes and variants. This also applies to the process according to the invention presented here.

The further formation of the typical head fold as well as the attachment of the thread and the label to the filter bag blank can then be divided into the following two categories.

Category 1 : The focus of the manufacturing process is the filter bag pre-forming:

The various versions of this are ultimately based on DBP 1 001 944. The solution to the problem is conceptually based on the filter bag pre-forming, to which the thread section and the label are fed and attached using a wide variety of solutions. A large number of subsequent patents show that this category has been further developed and processed in many different ways.

Category 2 : The label is the focus of the manufacturing process:

The procedure proposed here is based on category 2.
This category goes back to the DE 2 027 167 B However, the process known from this publication works with a stapling unit that uses metal staples to connect the label to the thread. The use of metal staples is undesirable.

The above-mentioned publication describes a machine for equipping packing bags with labels and holding threads, preferably tea bags, with a transport disc that can be rotated into different work stations, with the Devices assigned to individual work stations for inserting filled tea bags and labels, with a first stapling device for attaching the labels to their associated holding thread, with a second stapling device for attaching the labeled holding thread to the bag, with a device for removing the fully labelled bags from the machine, with gripper pairs assigned to each work station of the transport disk, which are formed from interacting legs and whose opening and closing movements can be controlled in line with the machine cycle.
The characteristic feature was that the gripper leg of each gripper pair, which runs forward in the direction of movement of the transport disk, has a pocket for receiving the label, that the associated gripper leg has a slot with an associated thread holder, that the label provided with the holding thread can be pushed into the pocket by a transport lever in the first work station of the transport disk when the gripper pair is closed so that the free end of the thread runs into the slot, that when the gripper pair is rotated further into the second work station by opening the gripper pair, the thread is secured by the thread holder and spans the space between the gripper legs, so that in this station a filter bag can be inserted when the gripper pair is open and the thread can be placed around the filter bag by closing the gripper legs and in a third work station of the transport disk the labeled thread can be attached to the filter bag by the second stapling device, which can then be removed in a fourth work station.

In short, this manufacturing process is carried out according to the DE 2 027 167 B the label is attached to the thread in a separate station, away from the central turret. Before the subsequent stapling process, the label is pulled along with thread by a predetermined length, creating a "chain" of label-thread-label, etc. The following links in the chain are each pulled along by one cycle. The frontmost label in the chain is pushed into a pocket on the central turret's arm, the associated thread into a gripper, before it is severed shortly before the following label and thus becomes the thread section for a bag. This The following label now takes the front position for the next pulling process.

The known process basically serves its purpose. Experience has shown that it can be used to produce a filter bag, whereby a comparatively small number of components are required and a relatively simple machine has to be operated.

1. 1. Mit wachsender Geschwindigkeit der Maschine nimmt die Störanfälligkeit der auf Zugspannung beanspruchten Faden-Etiketten-Kette gegenüber einer Lösung mit mechanischen Bauelementen überproportional zu.
2. 2. Nach dem Greifer für den Faden ist noch so viel frei hängender Faden notwendig, wie er zur Verknüpfung mit der Filterbeutel-Vorformung gebraucht wird. Das Fadenende einzufangen erfordert eine aufwendige Konstruktion und beim späteren Maschineneinsatz hohen Wartungsaufwand, da es sich um feingliedrige und stark verschachtelte Teile handelt. Ein solcher Faden ist erfahrungsgemäß schwer zu handhaben, denn er besteht aus Naturmaterial und neigt zum aufzwirbeln oder auffasern.
3. 3. Die ursprüngliche Lösung sah Heftverbindungen des Fadens mit Etikett und Kopffaltung mittels Metallklammern vor. Das ließ sich innerhalb dieses ursprünglichen Verfahrens einfach bewerkstelligen. Später hinzukommende Forderungen des Marktes an das Endprodukt Filterbeutel, dass nämlich diese Verbindungen metallfrei durch Verknotung und Verknüpfung allein mit dem Faden ausgeführt werden sollen, führte zu einer sehr viel komplizierteren Konstruktion.

However, experience shows that there are also disadvantages:

1. 1. As the speed of the machine increases, the susceptibility to failure of the thread-label chain, which is subject to tensile stress, increases disproportionately compared to a solution with mechanical components.
2. 2. After the gripper for the thread, as much free-hanging thread is required as is needed to connect it to the filter bag pre-forming. Catching the end of the thread requires a complex construction and a lot of maintenance when the machine is used later, as the parts are delicate and highly interlocked. Experience has shown that such a thread is difficult to handle, as it is made of natural material and tends to twirl or fray.
3. 3. The original solution involved stitching the thread to the label and folding the head using metal staples. This was easy to achieve within the original process. Later market demands for the end product, the filter bag, that these connections should be made without metal by knotting and linking with the thread alone, led to a much more complicated construction.

These disadvantages are to be addressed by EN 10 2018 101 570 A1 = EP 3 527 501 B1 The label and the thread strand are also connected in a separate assembly, which is located away from the central turret. They are then fed to a mechanically operated transport unit - a separate "Label revolver" - transferred. Here too, the thread has to be separated before being transferred to the label revolver due to the system.

In this publication, the label, which already had the thread attached, was fed to the main revolver via an additional auxiliary revolver. Parts of the thread, as they had already been pre-separated to bag size, had to be transported as a whip and then caught in order to attach it to the bag.

The disadvantages are the double transfer of the individual labels with the label thread attached and the relatively high effort required to catch the free thread end. However, the now mechanized label transport no longer affects the cycle rate (or machine speed). EP 3 527 501 B1 A separate label turret is provided that works in conjunction with the main turret. However, this involves greater machine and control expenditure.

In the present invention, however, the attachment of the thread to the label has been transferred to a separate (and thus clearly controllable) station 9. This means that the additional revolver with additional functions is no longer required. In addition, the new method makes it possible to transport the thread in one piece to the station where it is wrapped around the bag. In addition, the thread is already inserted into a thread channel 76 in station 12 in such a way that it no longer has to be caught in station 3.

In the DE 2 027 167 C The bag-forming hose section is pushed downwards by a slider along a slideway into a cavity in the central turret, called a pocket here. With this solution, there is enough space to seal the hose ends against the ejection of the goods due to centrifugal force. This known solution does indeed serve its purpose, but the method proposed here is intended to be significantly improved.

The invention is therefore based on the object of developing a method and a device for forming a filter bag, in particular for the metal-free connection of a thread to a label, in such a way that the connection can be carried out reliably even at high production speeds, so that filter bags can be manufactured at high production speeds with a low reject rate.

To achieve the stated object, the invention is characterized by the technical teaching of claim 1.

A preferred embodiment provides that the head closure is formed above the label before the connection with the thread, because this technical teaching ensures optimum freedom from interference in the connection between thread and label, because the thread is guided without tension and freely hanging thread ends are avoided.

In the invention, it is preferred if the label is not pushed between the bag wall and the head closure, but the head closure is folded over the label.

It is preferred if the top closure of the bag is folded over the label before the label is tied with a thread and before and/or during the connection with the thread. This ensures that the filter bag is correctly aligned with the label and the subsequent connection of the thread between the two parts (label and filter bag) that are correctly aligned and fixed to one another is particularly easy and reliable.

According to the subject matter of independent patent claim 2, it is preferred if the uncut thread emanating from the thread roll is transported together with the label (81) linked by thread loops to a specific station (9) of a central turret (13), in which it is looped around the bag.

With the invention, the thread ends are therefore no longer "captured", but are automatically drawn into the thread channel as an uncut thread to form the link and are thus guided in a controlled manner.

This has the advantage that the connection between label and thread is free of tensile stresses during implementation of the method according to independent claim 2. According to the invention, the uncut thread is cut much later - in comparison to the prior art - namely only when it has been connected to the label and has wrapped around the bag. The thread therefore remains uncut along the entire path of the central turret from station 9 to station 1 and is caught in a controlled manner on this path and can therefore no longer be lost - in contrast to the prior art - and is only cut off, for example, in a subsequent station 3 or 4. It can therefore be linked to the bag uncut without having to be caught. The thread is cut at a later stage and it is advantageous that it is already caught in the thread channel and can be guided further in a controlled manner after the cutting process.

The method according to the invention is therefore based on the label and this becomes the central element of the manufacturing process according to the invention as a reference point:
At the DE 2 027 167 B1 At the beginning of the production process, the label was tied to the thread strand and this unit was brought to a location where the hose section was positioned and formed to preform the filter bag. After the head fold was formed around the label, the thread section was attached to it. The stapling carried out with metal staples was to be avoided here and a metal-free knot was to be used instead. The label was therefore not fed to an already preformed filter bag from the outside, but the filter bag hose was fed to a label and formed around it. The separate feeding of label and thread in different stations (here in stations 8 and 9) into the revolver is a preferred change or improvement to conventional processes.

In the arrangements according to the state of the art, one also had to contend with the problem that the cut thread is difficult to handle because it hangs uncontrollably due to possible internal tension, deforms or swings diagonally to the left or right or blows away. Separation between label and thread feed in a single central turret is a significant change compared to an additional label turret after the EP 3 527 501 B1 , which supplies both at the same time.

According to the invention, a type of machine is proposed in which the label is inserted under the head closure of the bag for fixing during connection with the thread.

On the bag, the thread in a fixed position within the thread channel is now used to form the knot, whereby the thread protruding from the thread catcher is pulled in without additional control.

It is preferred if the label from the endless label strand is first fed into the central turret and separated. Then an endless, connected thread strand is transferred to the central turret. The separated label is then linked to the uncut, endless thread strand. The next step is to produce the bag. The bag is pushed through the pre-tensioned thread and thus wraps around the bag. The head closure is then formed. The label is clamped between a side wall, preferably the "rear" side wall of the bag and the folded-over head closure. The thread protruding from the thread catcher is now attached to the bag. The functions are carried out in a functionally clearly separated manner, which leads to a good overview of the process. The thread remains connected and uncut until it is separated in a station between the thread pliers and the label, in order to be looped around the bag when the piece of tubing is pushed into the bag pocket and to slide into the slot of the thread catcher.

The label is therefore positioned on the bag in such a way that it is folded into the head closure, but not attached. It is simply stuck in the head closure of the bag. This means that the position of the label on the central turret must be such that when you later The filter paper strand is folded over to form this head closure, a fold like wrapping paper is made. The label is then underneath this corner and is not caught in the subsequent sewing process. It must come off the bag during later use. The consumer must be able to remove the label from the head closure downwards so that he can use the bag.

The position of the label in the central turret is thereby determined. The label must be below the head closure or folded into this head closure, but not attached. In other words, there is a specific position where the label must be. For sewing purposes, however, it is more practical if the label protrudes a suitable amount from the rotating central turret. This avoids collisions during the subsequent sewing process. Otherwise, the sewing process would have to be carried out inside the rotating central turret, which involves a risk of collision with the other elements arranged there. It is therefore preferable if the label is only inserted halfway into the assigned station 8 and the thread is sewn on in the subsequent station 9. Although the label then still protrudes a long way from the central turret, this is not a problem because it is only brought into its final position in the subsequent station 10, together with the sewn-on thread.

This type of connection between thread and label has significant advantages over the prior art, because devices are known in the prior art that pull the thread with the sewn-on label, which means that the connection between label and thread is subjected to tensile stress. There are many problems that are avoided with the technical teaching of the invention.

The subject matter of the present invention results not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another.

All information and features disclosed in the documents, including the summary, in particular the information shown in the drawings spatial design, could be claimed as essential to the invention, provided that they are new individually or in combination compared to the prior art. The use of the terms "essential" or "according to the invention" or "essential to the invention" is subjective and does not imply that the features so named must necessarily be part of one or more patent claims.

The invention is explained in more detail below with reference to drawings which merely illustrate one embodiment. Further essential features and advantages of the invention are apparent from the drawings and their description.

• Fig. 1: Ansicht eines Zentralrevolvers mit 12 Stationen
• Fig. 1b: Beutel-Vorformung
• Fig. 1c: Detail der Kopffaltung im Schnitt
• Fig. 1d: Verknüpfung zwischen Faden und Etikett
• Fig.1e: Formung der Filterbahn zu einem Schlauch
• Fig. 2: Einstecken des Etiketts in eine Etikettentasche
• Fig. 3: Bereitstellung des Fadenstrangs in einer Fadenschlaufe
• Fig. 4: Verschiebung der Nadel zum Etikett
• Fig. 5a: Bildung des Knotens
• Fig. 5b: Zuführung des Fadens zur Bildung des Knotens nach Fig. 5a
• Fig. 6a: Bildung des Produkthäufchens über der Beuteltasche
• Fig. 6b: Gleiche Darstellung wie Fig. 6a einen Taktschritt später
• Fig. 7a: Art und Ausbildung des Fadenfänger-Gehäuses
• Fig. 7b: Fadenfänger nach Figur 7a mit eingesetzten Klemmstempeln
• Fig. 8a bis Fig. 8 c: Führung des Faden-Klemm- und Brems-Stempels in mehreren aufeinanderfolgenden Verfahrensschritten
• Fig. 9a bis 9f: Herstellung der Kopffaltung in mehreren aufeinanderfolgenden Verfahrensschritten
• Fig. 10a bis 10h: Herstellung der Verknüpfung in mehreren aufeinanderfolgenden Verfahrensschritten
• Fig. 11a bis 11f: Ablauf beim Einfangen des Fadens durch die Hakennadel
• Fig. 12a bis 12c: Ablauf beim Einfangen des Fadens durch die Hakennadel in einer verbesserten Ausführung nach der Erfindung
• Fig. 13a bis 13d: Bewegungsablauf der Hakennadel mit Erfassung des Fadens
• Fig. 14a bis 14f: Bewegungsablauf der Hakennadel mit Erfassung des Fadens in verschiedenen Ansichten
• Fig. 15a und 15b: Darstellung des Fadenstrangs in Relation zum Beutel mit Darstellung des Fadensperrstiftes
• Fig. 16a und Fig. 16b: gleiche Darstellung nach Fig. 15 im weiteren Fortschritt
• Fig. 17a bis 17c: Bewegungsablauf des Fadenkanals aus der Filterbeutelachse

Show it:

• Fig.1 : View of a central turret with 12 stations
• Fig. 1b : Bag preforming
• Fig. 1c : Detail of the head fold in section
• Fig. 1d : Link between thread and label
• Fig.1e: Forming the filter sheet into a tube
• Fig.2 : Inserting the label into a label pocket
• Fig.3 : Provision of the thread strand in a thread loop
• Fig.4 : Shifting the needle to the label
• Fig. 5a : Formation of the node
• Fig. 5b : Feeding the thread to form the knot after Fig. 5a
• Fig. 6a : Formation of the product pile above the bag pocket
• Fig. 6b : Same representation as Fig. 6a one beat later
• Fig. 7a : Type and design of the thread catcher housing
• Fig. 7b : Thread catcher after Figure 7a with inserted clamping stamps
• Fig. 8a to Fig. 8 c: Guiding the thread clamping and braking stamp in several consecutive process steps
• Fig. 9a to 9f : Production of the head fold in several consecutive process steps
• Fig. 10a to 10h : Establishing the link in several consecutive process steps
• Fig. 11a to 11f : Procedure for catching the thread through the hook needle
• Fig. 12a to 12c : Procedure for catching the thread by the hook needle in an improved embodiment according to the invention
• Fig. 13a to 13d : Movement of the hook needle with capture of the thread
• Fig. 14a to 14f : Movement sequence of the hook needle with capture of the thread in different views
• Fig. 15a and 15b : Representation of the thread strand in relation to the bag with representation of the thread locking pin
• Fig. 16a and Fig. 16b : same representation after Fig. 15 in further progress
• Fig. 17a to 17c : Movement of the thread channel from the filter bag axis

First, the differences between the invention and the prior art are explained. The drawings and reference numbers of the invention are used to explain the prior art. Although the essential differences were already mentioned in the introduction to the description, this was done without reference to the attached drawings and their reference numbers, which has been changed below.

Machines for producing double chamber bags (bag 20) with thread 93 and label 82 are realized based on two different basic ideas (process categories).

During the manufacturing process, many tasks occur that are processed in assemblies or outsourced. The solution approaches underlying an assembly are often adopted by other machines or even used in both process categories in a different arrangement.

What both process categories have in common is the production of the filter bag preform 24 itself: First, the filling material coming from a dosing device 70 is placed in heaps 72 on a flat filter paper web 71. Then the filter paper web 71 is folded around the heaps 72 to form a flat, endless, closed tube 73 ( Fig.1 and in section Fig.1e). From this, the frontmost hose section 74 is formed in the required length with the paper scissors 105 and cut into the filter bag preform 24 with its typical bottom fold 23 ( Fig.1b ). Further processing is usually carried out in stations on another central turret 13.

This is now the dominant state of the art, which has been adopted in practically all known processes and variants. This also applies to the process according to the invention presented here.

The further formation of the typical head fold 25 as well as the attachment of the thread 93 and the label 82 to the bag blank can then be divided into the following two categories.

Category 1: The focus of the manufacturing process is the filter bag pre-forming 24:
The various explanations are ultimately based on the DE 1 001 944 B . The solution to the problem is conceptually centered around the filter bag preform 24, to which the thread section 93 and the label 82 are fed and attached using a variety of solutions. A large number of subsequent patents show that this category has been further developed and processed in many different ways.

Category 2: The focus of the manufacturing process is label 82: Note: The process proposed here is based on Category 2.

Fig.1 shows the entire process and is also suitable for discussing the differences to its corresponding predecessor methods.

This category goes back to the DE 2 027 167 B The entire production of the bag 20 with thread section 93 and label 82 is based on the label 82, although this is actually perceived as an unimportant appendage of the dominant end product, bag 20. The process is therefore based on the label 82 and this becomes the central element of the production process as a reference point: The above-mentioned publication shows that the thread strand 92 is knotted to the label 82 at the beginning and this unit is brought to a place where the tube section 74 is positioned and used for pre-forming the bag. 24 is formed. After the head fold 25 has been formed around the label 82, the thread section 93 is attached to it.

In the prior art, the label 82 is therefore not fed to an already pre-formed bag 24 from the outside, but the filter bag tube 73 is fed to a label 82 and is virtually formed around it.

Therefore, the method proposed here does not affect the designs of Category 1 and only solutions of this Category 2 are considered for the description of the state of the art and for comparison.

In its original form after the DE 2 027 167 B the label 82 is attached to the thread 93 in a separate station away from the central turret 13. Before the subsequent stapling process, the label 82 is pulled further with thread 93 by a predetermined length, creating a "chain" of label-thread-label, etc. The following links in the chain are each pulled further by one cycle. The frontmost label of the chain is pushed into a pocket 83 on the setting arm 84 of the central turret 13, the associated thread 92 into a gripper before it is severed shortly before the following label 82 and thus becomes the thread section 93 for a bag. This following label 82 now takes over the frontmost position for the next pulling process.

1. 1. Mit wachsender Geschwindigkeit der Maschine nimmt die Störanfälligkeit der auf Zugspannung beanspruchten "Faden-Etiketten-Kette" gegenüber einer Lösung mit mechanischen Bauelementen überproportional zu.
2. 2. Nach dem Greifer für den Faden 93 ist noch so viel frei hängender Faden 126 notwendig, wie zur Verknüpfung 136 mit der Filterbeutel-Vorformung 24 gebraucht wird. Das Fadenende 126 einzufangen erfordert eine aufwendige Konstruktion und beim späteren Maschineneinsatz hohen Wartungsaufwand, da es sich um feingliedrige und stark verschachtelte Teile handelt.
3. 3. Die ursprüngliche Lösung nach dem Stand der Technik sah Heftverbindungen des Fadens 93 mit Etikett 82 und Kopffaltung 25 mittels Metallklammern vor. Das ließ sich innerhalb dieses ursprünglichen Verfahrens einfach bewerkstelligen. Später hinzukommende Forderungen des Marktes an das Endprodukt Beutel 20, dass nämlich diese Verbindungen metallfrei durch Verknotung 88 und Verknüpfung 136 allein mit dem Faden 93 ausgeführt werden sollen, führte zu einer sehr viel komplizierteren Konstruktion.

The method according to the state of the art basically fulfills its purpose. Experience has shown that a bag 20 can be produced using it, whereby a comparatively small number of components are required and a relatively less complex machine has to be operated. However, experience has shown that there are also disadvantages.

1. 1. As the speed of the machine increases, the susceptibility of the "thread-label chain" subjected to tensile stress increases disproportionately compared to a solution with mechanical components.
2. 2. After the gripper for the thread 93, as much freely hanging thread 126 is required as is needed for the connection 136 with the filter bag preform 24. Catching the thread end 126 requires a complex construction and high maintenance effort during later machine use, since these are delicate and highly nested parts.
3. 3. The original solution according to the state of the art provided for stitching connections of the thread 93 with the label 82 and the head fold 25 using metal staples. This was easy to achieve within this original process. Later market demands for the end product bag 20, namely that these connections should be made metal-free by knotting 88 and linking 136 using only the thread 93, led to a much more complicated construction.

These disadvantages want to EN 10 2018 101 A1 The label 82 and the thread strand 92 are also connected to one another in a separate assembly - removed from the central turret 13. They are then transferred to a mechanically operated transport unit - a separate "label turret". Here too, due to the system, the thread 93 must be separated before being transferred to the label turret. Disadvantages are the two-time transfer of the individual labels 82 with the thread of the label 82 attached and the relatively large amount of effort required to catch the free thread end 126. However, the now mechanized label transport no longer affects the cycle rate (or machine speed).

In the drawings, the ejection of the filling material 72 when the lateral hose ends 21 are raised by the setting arms in the filter bag preforming 24 is not shown, since it is DE 2 027 167 B As far as the invention is consistent with the prior art with regard to this feature, reference is made to the disclosure in the DE 2 027 167 B1 referred to.

In the invention, however, it is preferred if the bag-forming tube section 74 is pushed downwards into a cavity in the central turret 13, here called bag pocket 75, with a tube inserter 109 via a slideway, as described in connection with the Fig.6 This solution provides sufficient space to seal the side walls 21 of the hose ends of the filter bag blank against ejection caused by centrifugal force.

In order to make the proposed process as clear as possible, the drawings have always been simplified and, where possible, only the essential parts are shown. The representation of the same component may therefore differ in the various figures, provided that simplification makes the process more understandable. Obscuring components are also often omitted if they do not necessarily contribute to understanding. The reference number is retained. For example, plungers 143 and 158 are used in different places; they are defined like standard parts and are not described anew for each location. Larger assemblies are often machined separately from the turret due to the space required, but are mechanically connected to the turret.

Operations which are known as state of the art are only described in more detail if their effect in the presented process would otherwise be difficult to understand.

Right and left, top and bottom refers only to the drawing shown, not to the machine built according to the presented method.

Brief overview of the presented procedure (see Fig. 1 ):

The central unit of the machine is a central turret 13, which in this example is equipped with twelve stations 1 - 12. The stations are numbered according to the clock (12 o'clock is at the top, 6 o'clock is at the bottom) and are switched in the machine cycle - direction of rotation 30 clockwise.

Procedure in brief:

In station 8, a label 82 - protruding outwards - is placed into a label pocket 83 (see Fig.2 ) and separated from a label web 81.

In station 9 , a thread, coming as a thread strand 92 from a thread roll 91, is fed and knotted to the label 82.

Between stations 9 and 10, the thread strand 92 is grasped by a thread tong 94.

In station 10, the label 82 protruding from the label pocket 83 is completely inserted into the label pocket 83.

In the process presented here, nothing happens in station 11 and it is available as a reserve for any future operations that may be required. To continue the part located at the level of the (next) station 1, the thread strand 92 between the thread pliers 94 and the label 82 is severed with the thread scissors 106 in order to release it for station 12.

In station 12, the tube 73 containing the piles 72 of the filling material is then pushed into the revolver 13. The two side walls 21 are raised and the characteristic knee of the bottom fold 23 is formed. This creates a filter bag preform 24 aligned with the label 82 in station 12 ( Fig. 1b and Fig.6b ). Fig. 1b shows that the filter bag preform 24 has a shorter side wall for the head fold 25 and a longer, protruding side wall 22.

Fig. 1c shows the double chamber filter bag 20 with the bag chamber 26 and the upper edge 118 of the bag head.

As a result, the thread strand 92 - withdrawing from the station 1 - is on the one hand looped around this resulting filter bag pre-forming 24 to form a looping thread 113 and on the other hand slides into a thread channel 76 down to its channel bottom 168.

Fig.6a shows the state before the hose section 74 was inserted and Fig.6b the state after insertion. It can also be seen how the thread strand 92 is pushed into the bottom 168 of the thread channel 76. There, the thread strand 92 is secured by a thread locking pin 156, which is the thread strand 92 is prevented from being plucked out of the thread channel 76.

In station 1, as described, the continuous thread strand 92 was first separated. Up to this point, the thread strand 92 still reached through to the filter bag pre-forming 24 located in station 1. Only through this cut with the thread scissors 106 near the label knot 88 is the thread section 93 for the filter bag pre-forming 24 in station 1 separated.

Note: The actual advantage and purpose of the proposed method must be noted: namely that the delicate thread strand 92 is forcibly guided until the last moment and the looping thread 113 is formed without it ever being free and at the same time is forcibly inserted into components where it is positioned exactly for the knot 88 on the head fold 25 without difficult-to-control corners and free-hanging ends. The head fold 25 is then produced in stations 1 and 2 on the filter bag pre-forming 24 by folding it several times around the folding shoulders 86 on the label pocket 83, thus also ensuring that the label 82 takes up a proper position inserted into the head closure of the later filter bag 20.

In station 3, the thread section 93 and the head fold 25 of the filter bag preform 24 are tied together and the thread locking pin 156 is retracted. At this point, the filter bag 20 is completed.

Stations 4 and 5 have no function for this procedure.

Station 4 can check whether the thread is properly attached. In station 5, the bag can be placed in an "overbag" (a type of envelope made of paper or a heat-sealable film strip).

In station 6 the filter bag 20 is removed.

Detailed description of the processes in the individual stations of the central turret 13

(for all contexts see general Fig.1 )

There, the movement axis of the hose inserter 109 is shown at 129. A flange 188 for receiving the revolver 13 is shown.

Station 8 : Provision of label 82:

The frontmost label 82 of a label web 81 is placed in a pocket 83 (see Fig.2 ) (the pocket 83 can also be referred to as a "slot") between a setting-up arm 84 arranged on the central turret 13 and a folding shoulder 86 (Fig.2a) by means of an insertion device 110.

It is only pushed in so far that the separation point and the label scissors 104 between the label web 81 and the separated label 82 are located outside the envelope circle 14 of the central turret 13. The reason for this is as follows: when the thread strand 92 is later knotted together with the label 82 in station 9, the construction effort outside the envelope circle 14 is less than in the spatially restricted conditions within the envelope circle 14.

Behind the - with respect to the direction of rotation 30 - fixed setting arm 84, an axially radially displaceable thread pliers 94 is mounted.

Note: In the drawings, this is always shown in plan view rotated by 90° in order to convey its function intuitively.

This thread pliers 94 has three working positions: Position 1: 94-1 Open. Position 2: 94-2 When pressed lightly, it acts as a thread brake. Position 3: 94-3 Tightly closed, fixes the thread strand 92

In station 8, the thread pliers 94 are still retracted behind the enveloping circle 14 into the interior of the central turret 13. This leaves free space for the label scissors 104. They can cut the frontmost label 82 from the label web 81 without colliding with parts of the central turret 13. After the frontmost label 82 has been cut off, the central turret 13 is switched to the next station 9 with the label 82 protruding beyond the enveloping circle 14.

Station 9 : Preparation of thread strand 92:

The thread is pulled as an endless thread strand 92 from a thread roll 91 via a thread brake 99 through a needle eye 90 of a needle 89 to the thread pliers 94, which is currently located in station 10. This pulling takes place on the one hand by the rotation of the central turret 13 and by the slide 108 during the subsequent formation of the thread loop 95.

Note: The needle 89 is part of a EP 2 607 247 B1 known device for forming a knot 88 from an endless thread strand 92. Since the device for the knot 88 is not the subject of the protection request, only the needle 89 is shown here. The thread, which consists of a Fig. 5b shown loop 203 is released. This is formed during the process in a suitable time segment.

Between the successive labels 82 of stations 9 and 10, the thread strand 92 must be brought to the length of the thread section 93 that is needed for a later filter bag 20. This is done by storing and preparing the thread strand 92 in a thread loop 95 (see. Fig.3 ). The thread loop 95 is formed by pushing the thread strand 92 to the thread path 96 with a slider 108 between thread deflections 97 and 98 and thus pulling it along. The thread deflections 97 and 98 are also designed as thread brakes. Since the thread strand 92 is held by the thread pliers 94-3 in station 10, which are now closed, the thread strand 92 required for the thread loop 95 is drawn from the thread roll 91 through the needle eye 90 and fed in without putting any strain on the sensitive label 82 in station 10. The thread path 96 before the formation of the thread loop 95 is shown in Fig.1 , the thread path 95 after formation of the thread loop 95 in Fig.3 shown.

Connection of label 82 with thread strand 92 :

A device for forming a knot 88 from an endless strand of thread 92, represented by its needle 89, connects the strand of thread 92 to the label 82.

Fig.3 : The needle 89 is positioned outside the path of the label 82 during the rotation of the central turret 13 by pivoting away. Thus, a collision between needle 89 and central turret 13 or label 82 is not possible, for which the already mentioned loop 203 ( Fig.5 ) contributes.

Fig.4 : In the next step, the needle 89 moves to the position above the label 82 where the knot 88 is desired.

Fig.5 : There, the label 82 is pierced by the needle 89 and the knot 88 is formed there. After the knot 88 is finished, the needle 89 is retracted and swings back on the same path it came, into its waiting position outside the path of the label 82 (see also Fig.3 ).

At the beginning and during the movement of the central turret 13 from station 9 to station 10, the thread tongs 94-1, which are still open in station 9, are moved outwards into the position in which the thread strand 92 runs through them and can be grasped by them. By closing the thread tongs 94 to position 94-3, the thread strand 92 is fixed/clamped. As soon as the central turret 13 has come to a standstill, the thread strand 92 can be extended to the required length by pulling it off the thread roll 91 and by forming the thread loop 95. This is done without forces being able to be transferred to the sensitive label 82 in station 10, to which the thread strand 92 is already knotted. The pulling movement is generated by a slide 108. In order to ensure that the thread loop 95 always remains under the required tension, a thread guide 101 is provided in the central turret 13, which guides the apex of the thread loop 95 with gentle force (see also Fig. 3 and Fig. 4 ).

Station 10 : Move label 82 to final depth

Once it has arrived at station 10, the thread strand 92 is fixed in the thread pliers 94-3. Here, the label 82 is pushed further into the label pocket 83 to a precisely defined depth using a slider 114 (see comparison of Fig.1 and Fig.4 with Fig.3 ). The label 82 is inserted so far that it does not collide or become attached to the filter bag preform 24 including the head fold 25 and the connection 136 of the thread section 93 that takes place later in stations 1 to 3.

Station 11 : This station has no function for this procedure. Station 12: Insert thread strand 92 into thread channel 76 and hold it:

The advance explanation of the elements involved helps to ensure that the subsequent functional description can be followed without interruptions.

Fig.3 : A thread catcher 100 is connected to a lifting arm (tilting lever) 85. In the thread catcher 100 is Fig.7a and 7b a thread channel 76 is incorporated, into which the thread strand 92 slides in the course of the process steps, as will be shown later, to the bottom 168 of the thread channel 76. Where the connection 136 with the head fold 25 is to take place later in station 3, the holes 119 and 120 run transversely (perpendicular to the bottom 168 of the thread channel) through the thread channel 76 and the thread catcher 100 for the insertion of the hook needle 117. Fig. 8a a leading figure from the group of drawings in Figures 8ff, because essential characteristics are depicted there.

• Bohrung 155 für einen Faden-Sperrstift 156,
• Bohrung 141 für einen Faden-Klemmstempel 147,
• Bohrung 142 für einen Faden-Bremsstempel 148.

Die Faden-Klemm- und Brems-Stempel 147 und 148 selbst bestehen analog aus je einer schaftartigen Schubstange 159 und je einer damit verbundenen Andrückplatte 163, wie in Fig. 8a bis Fig. 8c am Beispiel für den Bremsstempel 148 gezeigt. Die Andrückplatte 163 wird durch die Wirkung einer Feder 160 gegen die Führungswand 137 (innere Kanalwand) im Fadenkanal 76 gezogen, so dass der Fadenstrang 92 dazwischen verläuft. Je nach Auslegung der jeweiligen Feder 160 kann die Andrückplatte 163 den Fadenstrang 92 fixieren oder bremsen.The following 3 holes run perpendicular to the inner wall 169 of the thread channel 76:

• Hole 155 for a thread locking pin 156,
• Hole 141 for a thread clamping stamp 147,
• Bore 142 for a thread brake piston 148.

The thread clamping and braking stamps 147 and 148 themselves consist analogously of a shaft-like push rod 159 and a pressure plate 163 connected to it, as in Fig. 8a to Fig. 8c shown using the example of the brake piston 148. The pressure plate 163 is pulled against the guide wall 137 (inner channel wall) in the thread channel 76 by the action of a spring 160, so that the thread strand 92 runs between them. Depending on the design of the respective spring 160, the pressure plate 163 can fix or brake the thread strand 92.

To increase the safety of the thread guide, the pressure plate 163 is provided with a pin 162 for thread retention, which is inserted into a hole 161 in the thread channel 76. This closes off the space and prevents the thread strand 92 from sliding out sideways, without affecting the Guide wall 137 (inner channel wall) because with a 12-part revolver a precise adjustment of the sensitive stroke setting would be necessary 12 times.

With the pressure of the tappet 158 on the push rod 159, the Fig. 8c shows, the pressure plate 163 from the guide wall 137 and allows the thread channel 76 to be opened for the thread strand 92 and the thread strand 92 to slide in or be pulled out. The arrangement shown here opens the thread channel 76 as long as the plunger 158 is pressed. This only happens during the time in which the thread strand 92 is to slide into the thread channel 76 or is to be released from the thread channel 76.

Note: If spatially or technically possible, the function of the plunger 158 can also be implemented with a jointly controlled component. The same considerations as for the thread clamping and braking plungers 147, 148 also apply to the thread locking pin 156, which prevents the thread strand 92 from being plucked out of the thread channel 76, for example while it is being pulled by the hook needle 117 to form a loop during the linking through the filter bag head fold 25 above the bore 119. It thus remains in the thread channel 76 above the bore 120 and can be grasped by the hook needle 117.

The functions shown can be shown in detail using the function of the brake piston 148: In Fig.8a it is set to brake, with slight "opening" in Fig.8b the thread is free, but cannot leave the channel 76 because of the pin 162 of the thread retainer. The thread can only slide freely in or out when ( Fig.8c ) the brake piston 148 together with the thread retainer is completely pulled out of the channel 76. The pressure plate for the loop 153 is designated 182. The lower recess in the thread channel for the pressure plate 163 is designated 183.

A significant advantage of this process is that all the functions used can be carried out using very simple components, which also require only a small amount of effort during subsequent operation of a machine built using this process. The further process is described using station 12.

Form filter bag preform 24 and pull thread strand 92 along:

In Fig.1 the central turret 13 has already arrived in its holding position. By means of a slight pivoting movement of the setting-up arm 85 - which can advantageously be carried out during the rotational movement of the central turret 13 but also after the central turret 13 has come to a standstill or in combination - the pouch pocket 75 is opened so wide (cf. Fig. 6a and 6b ) that the hose section 74 can be pushed by the hose inserter 109 into the bag pocket 75 and forms the filter bag preform 24. The pivoting movement can take place via a linear guide with a swing arm with a pivot point for a swing lever.

In the process, the thread piece 164 spanning the passage is pushed along, whereby the thread strand 92 is pulled out to form a looping thread 113 which encircles the filter bag preform 24 at the end. Since the thread pliers 94-3 at station 12 fix the thread strand 92 from the label side, the thread re-tightening required for the looping thread 113 must come from station 1. However, since the thread strand 92 in station 1 is still connected to the label 82 there and is fixed by the thread pliers 93-3 there, the thread re-tightening must be made possible before the hose section 74 can be pushed into the bag pocket 75. This is done by cutting the thread strand 92 between the label 82 and the closed thread pliers 94-3 with a thread scissors 106 in station 1, whereby the thread section 93 for the later filter bag 20 remains in station 1. In Fig.6a the thread separation 165 is clearly visible. Likewise, the thread pliers 94-3 located in station 1 are opened to the level 94-2 and the thread locking pin 156, the thread clamping and braking stamps 147 and 148 are brought into the free position, i.e. pressed out of the thread channel 76 (Fig.7c) by the plungers 158.

At the same time, at station 12, the thread retraction, when the hose section 74 is pushed in and the thread strand 92 is pulled around the filter bag preform 24, allows the thread strand 92 to slide into the thread channel 76 (see Fig. 6b ). The loosened thread forceps 94-2 In station 1 and the subsequent braking thread deflections 97 and 98, the thread strand 92 is pulled in by the braking and is drawn into the thread channel 76 up to the guide wall 137 to the bottom 168 without further controlled elements.

The insertion 109 is carried out by pushing the hose section 74 through a guide track - not shown - into the bag pocket 75. As can be seen from Fig.6a (before and Fig.6b (after inserting the hose section 74), the thread piece 164 stretched over the bag pocket 75 envelops the filter bag preform 24. The thread strand 92 for the wrapping thread 113 is pulled over the thread brake of the thread brake stamp 148 coming from station 1.

Due to the geometric arrangement, the thread strand 92 slides up to the guide wall 137 on the bottom 168 of the thread channel 76 ( Fig. 6b ). After the thread strand 92 has reached the bottom 168 of the thread channel 76, the plungers 158 are loosened and the thread locking pin 156 as well as the thread clamping and braking plungers 147 and 148 are released by the springs 160 (see Fig.8 ) into their locking position, ie the pins 162 cover the thread channel 76 and the thread strand 92 can no longer slide/slip out of the thread channel 76.

Station 1: Cut thread strand 92 and start head fold 25:

When describing the processes in station 12, it was already anticipated that the continuous thread strand 92 is only severed in station 1. Up to this point, the thread strand 92 was a single continuous strand, starting at the thread roll 91 and ending at the point of the head fold 25. The thread is a natural material that is difficult to control and reacts unpredictably if it and its thread ends 126 are given free space. For the controlled thread guidance of a fast-running machine, it is a significant simplification that the thread can simply be pulled through the entire machine. This is extremely important and (for double-chamber bags produced by folding in category 2) advantageous and a fundamental innovation:
Several stations are eliminated where the loose thread end 126 would have to be caught or guided, as was initially the case in the DE 2 027 167 B and also in the EN 10 2018 101 A1 was the case. Thus, the thread end 126 only has to be checked after this cutting with the thread scissors 106. The forced pulling of the thread strand 92 into the thread channel 76 in an exact position and the control of the thread strand 92 and later the thread section 93 with the locking and braking elements of the thread catcher 100 and the thread channel 76 also performs this task.

For stations 1 to 3, the thread section 93 is now knotted at one end to the label 82 and is tightly clamped at its free thread end 126 in the thread channel 76 between the thread clamping and braking stamps 147 and 148 at an exact position where it can be linked to the head fold.

The head fold 25 ("head closure") can be distributed to stations 1 to 3. A possible procedure is shown in the Fig. 9a to Fig.9f , which will be discussed later.

Figure 9f shows a closing/folding edge 197 for the folding shoulder 86 in the area of the protruding side wall. The edge 197 has an angle 198 and 199 shows the projection of the side wing over the central axis 140. The tip that protrudes beyond the upper edge 118 is designated 200. The tip that is folded over the upper edge 118 is designated 201. In Fig. 9e 205 shows an upper edge which projects beyond the side wall.

Station 2: Form head fold 25:

By taking over individual movements of the head fold 25, the schedule of station 1 can be relieved or station 2 can remain free and be available for later modifications if necessary. This is not important for the proposed method.

Station 3: Connect the head fold 25 (e.g. in Fig.1c, Fig.9f, Fig.10) with the thread end 126 of the thread section 93 and close:

In station 3, the thread channel 76 plays a crucial role. To facilitate understanding, the most important features of the thread channel ( Fig.7a Longitudinal section, Fig.7b Cross-section) briefly summarized. The wall closer to the machine housing is called the "inner wall" or guide wall 137, the one further away is called the "outer wall" 169. They are connected by the base 168.

The brake piston 148 is guided through a bore 142, hitting the guide wall 137 perpendicularly, the clamping piston 147 through the bore 141 and the thread retaining pin 156 through the bore 155. Perpendicular to this, i.e. perpendicular to the bottom 168 of the channel, are the passages or bores 119 and 120 for the hook needle 117 (see Fig. 7a ). These passages can locally widen the thread channel they must traverse according to the passages, continuing to be called a "bore".

The filter bag preform 24, which is now fully formed with its head fold 25, and with the thread section 93 as the looping thread 113, arrives at station 3. The thread section 93 runs, secured by the thread clamping and braking stamps 147 and 148 as well as the thread locking pin 156, along the guide wall 137 through the thread channel 76 to its thread end 126. The task at station 3 is to tie the thread end 126 of the looping thread 113 together with the head fold 25 and at the same time securely close the later filter bag 20.

• Variante A: Eine Verknüpfung 136 mit Einstichen entlang der Richtung der Filterbeutelachse 140.
• Varianten B und C: Die Art der Verknüpfung 136 aus Variante A kann analog auch auf eine um 90° gedrehte Form mit Einstichen parallel zur Oberkante 118 übernommen werden. Die Richtung der Verknüpfung 136, und damit des Fadenendes 126, muss hierzu unter der Voraussetzung straffer Fadenführung um 90° umgelenkt werden.

This task can be performed in variants:

• Variant A: A link 136 with punctures along the direction of the filter bag axis 140.
• Variants B and C: The type of link 136 from variant A can also be applied analogously to a form rotated by 90° with stitches parallel to the upper edge 118. The direction of the link 136, and thus of the thread end 126, must be redirected by 90° under the condition of tight thread guidance.

Note: Variants B and C have the advantage of a more secure closure quality of the subsequent filter bag 20, since the left and right parts of the head fold 25 are captured with absolute certainty by the link 136. In variant A, the two parts must overlap sufficiently to be captured by the link 136. From the Fig.9d and 9e , in which the bag is shown in two halves split in the middle, the overlapping punctures can be seen.

Variant A: Linking 136 of the thread end 126 of the looping thread 113 in the direction of the filter bag axis 140:
The link 136 is basically from the DE 196 19 518 A1 To make the procedure easier to understand and to show how this solution can be incorporated into the procedure presented here, it is briefly explained using the Fig. 10a to Fig. 10h explained.

Note: The holes 119 and 120 allow the hook needle 117 to grip under the thread 113 and not to hit the thread catcher 100 or the bottom 168 of the thread channel 76 hard.

First, the hook needle 117, which is outside the enveloping circle 14 ( Fig.3 ) is positioned, via the hole 119 (to Fig.4 or to Fig.10a ) pierces the head fold 25 for the first time and then grips the thread 173 ( Fig.10b ). On its way back through the head fold 25, it pulls the thread with it through to the front side, forming a loop 131 (see Fig. 10c ). If a piece of the thread end 126 is pulled back into a loop 131, there is a risk that the remaining thread end 126 will be pulled out of the thread channel 76 and thus lose its safe transfer position. The course of the thread end 126 in the thread channel 76 allows ( Fig.10c and 10d ) how the thread end 126 is held by the thread retaining pin 156 at the bottom of the thread channel 76 to prevent it from slipping out.

Note: to print the drawing sheet with the Fig.10a-h In order not to overload the reference numbers are not listed in each of the almost identical figures, because they are taken from one of the other related figures, e.g. Fig.10a The same applies to the entire registration.

The hook needle 117 is now moved - with the loop 131 around its shaft - to the position of the hole 120 and takes the loop 131 with it (see Fig. 10d ). It now pierces the head fold 25 a second time and reaches under and grasps the looping thread 113 further in the direction of its thread end 126. On the way back, the thread end 126 is pulled up and through the loop.

Fig. 10e shows the thread end 126 pulled through the loop 131 in the state with the brake plunger 148 open and the thread locking pin 156 retracted. The hook needle 117 is then completely retracted ( Fig.10e ) and releases the loop formed by the encircling thread 113 with the pulled thread end 126, as also shown in Fig.10e can be recognized.

The tightening of the link can be done independently of the process described so far. Starting from Fig. 10e Pulling on the thread 135 causes the loop 131 to Fig.10e to the breakthrough 171 above the bore 119 ( Fig. 10f ) and takes the thread end 126 with it and ends the link 136.

How Fig.10a to 10h show, the method presented here can be expanded to carry out the second gripping of the thread behind the upper edge 118 of the bag and thus to move the link further "up" in order to gain space for the label 82 and to dispense with a second piercing through the filter paper, which helps to protect the hook needle 117.

Additional reinforcement can be achieved by threading the thread through loop 131 as loop 184 in Fig.10g and leads the loop to the piercing 171. The connection is then not made by a thread, but, as Fig.10h shows, through two threads. Fig.11a to Fig.11f show the normal process of catching the thread 82 by the hook needle 117. The areas of the holes 141 and 142 are designed in such a way that for the hook needle 117 on its "back side", if for geometric reasons (slot width, diameter of the hook needle, etc.) required, a milling 178 is provided and on its "front side" a milling 180. The bore extension in the form of the milling 178 at the back ensures that the needle can pass without grazing, the milling 180 provides space for the thread pushed away from the needle ( Fig. 11c and 11d ), which is used when the needle returns ( Fig.11e and 11f ) springs back into the recess 181 of the hook needle 117.

This takes place under the condition that the thread 173 remains stretched during the described process and the tension does not decrease. This requires a very high level of precision in the feeding of the thread 173, because even if the thread 173 is fed in slightly too much, the thread loses its stretched guidance and is no longer reliably grasped. Many factors play a role here, such as thickness, elasticity, uniformity of the thread, slot width and depth of the thread channel, etc. The process can be expanded by the following, as shown in Fig.12a to 12c is set out: A hole 175 is made through the thread catcher 100 between the holes 141 and 142, through which a pusher 176 coming directly from the machine pulls the thread 174 into a loop 177. This loop must take up at least - but not exactly - enough thread so that it is pulled straight at the time when the thread 173 - or the thread end 126 - must be caught by the hook needle 117. This function can be extended to keep the loop 131 straight until the final knotting to the piercing 171 ( Fig. 10 f) to pull.

In the case of unfavorable conditions such as irregular thickening of the threads 92 or a thickness that does not match the thread channel 76, etc., disruptions in the process can occur. This can be remedied by the following preferred extension of the process:
The bore 120 is enlarged perpendicular to the course of the thread 92 to form a milled recess 178. Fig. 13a in side view and Fig. 13b show in plan view how the hook needle 117 is guided past the thread 92 when piercing the enlarged bore 120. Before the hook needle 117 returns, a minimal relative movement between the hook needle 117 and the thread channel 76 ( Fig.13c and 13d ) ensures that the thread is securely grasped. the transverse movement is minimal - in the order of magnitude of the thread thickness - this does not lead to any problems during retraction through the piercing of the head fold 25.

The relative movement between the hook needle 117 and the thread 92 mentioned in the previous section can be achieved by moving the needle (together with the entire knotter 115) transversely to the bag axis 140 (longitudinal movement) or by the thread catcher carrying out the small movement.

Fig.14 : In addition, it is possible to perform a rotation 219 of 180° with the needle 117 around a rotation axis 204 which is arranged eccentrically to its own axis of symmetry. This happens as soon as the recess 181 of the hook is at the same height as the thread 92. The mechanism can be understood from Fig.14a and b (the back of the hook needle passes the thread, while after a 180° turn the thread comes into the recess of the hook 181 ( Fig.14d). Fig.14e shows on an enlarged scale how the thread is already caught in order to be pulled up into a loop. This illustration also shows how the thread channel 76 fits into the entire thread catcher - this applies to all examples shown here. The Fig.14c and 14f represent the respective top view.

Regardless of the additional functions, the process is as follows: As soon as the thread end 126 is completely pulled through the loop 131, the thread clamping stamp 147 is also released. From this point on, the loop 131 can be pulled back on the thread 135, whereby the thread 135 coming from the loop 131 slides back through the first puncture and the thread end 126 is lashed between the pierced head fold 25 and the shortening loop 131. It is irrelevant whether the lashing is done mechanically - possible by a tightening element in station 4, by the above-mentioned additional hole 175 with plunger 176 or only during use when the filter bag 20 is hanging on the label 82. In any case, the link 136 is pulled back by pulling on the label 82 at the latest. and on thread 135 (see Fig.1d ) firmly.

The two holes 119 and 120 can be replaced by a slot which at least encloses the holes and has the width of the hole diameter. This has the advantage that the hook needle 117 is permitted a small dimensional deviation along the axis of the two holes, although it must then be precisely adjusted transversely to the axis. Since the conditions are easy to understand, they are not shown in a separate illustration.

Variant B: The connection 136 of the thread end 126 with the head fold 25 should be transverse to the filter bag axis 140:

For a connection parallel to the upper edge 118 of the head fold 25, the thread path must be rotated by 90° relative to the filter bag axis 140. The thread 113 of the hook needle 117 must be made available in the same controlled manner as in version A, i.e. taut and spatially/locally fixed.

Until the thread strand 92 is inserted into the thread channel 76, everything runs as in version A, but without the connection being made. Only then are additional functions required. In Fig. 15a the thread channel 76 is interrupted by a rotary plate 149. The location of the rotary plate 149 is chosen so that it completely covers the holes 141 and 142 and its axis of rotation is in the middle between these holes. The thread channel 76 is continued in the rotary plate 149 by its own thread channel 157 so that the combined thread channels 76 and 157 behave like the single thread channel 76 in version A. The thread strand 92 is thus covered as described.

The turntable 149 is now rotated by 90°. This could Fig.15a by a plunger 158, which acts on a lever 167 connected to the rotary plate 149. The thread strand 92 is now located together with the thread channel 157 parallel to the upper edge 118 of the bag ( Fig. 15b ). Then - analogous to the description in variant A - the thread 113 is tied on. The arrangement and The function of the thread clamping and braking stamps 147 and 148 in the thread catcher 100 does not change compared to variant A. Only the retaining pin 156 must be aligned in the direction of the filter bag axis 140, since the thread 113, which is linked to the head fold 25, is no longer lengthwise but crosswise.

For the path or path segment of the thread 113 from the thread channel 76 to the transverse thread channel 157, a recessed guide channel 150 is kept free in the rotary plate 149 and/or in the thread catcher 100. The recess 150 in the thread catcher 100 is shown. Recessed guide channels are generously dimensioned in order to offer little resistance to the thread 151 pulled through, in particular the deflecting edges 152 are softened to small circular segments. Compared to the time schedule of variant A, it must be noted that the time for the rotation of the rotary plate 149 must be taken into account. The thread retaining pin 156 is shown in Fig. 15a to Fig. 14c not, because it and the filter bag axis 140 overlap each other. However, it is shown in Fig. 15a and Fig. 16a

This example shown here with a centrally mounted turntable 149 can be adapted to specific environmental conditions in terms of pivot point, channel path, etc. This is shown in Fig. 15c and Fig.16a shown, for which the same explanation applies as for the Fig. 15a and Fig. 16b

In variant B, the rotary table 149 is the central component by which the direction of the link 136 is changed. The rotary table 149 is a miniaturized component in a dusty environment, which would also have to be installed in every station of the central turret 13, i.e. 12 times in the version shown here, with extremely precise adjustment. This is the most sensitive point - compared to the rest of the extremely robust process. This is an important point. Therefore, in a further, preferred embodiment, a simpler process is further developed for deflecting the thread end 126 for the purpose of a link 136 transverse to the filter bag axis 140.

Variant C: Analogous to variant B:

The aim is to transfer the essential functions of the rotary table 149 to a component that is arranged outside the central turret 13. A sliding axis 122 is chosen as the solution here.

In Fig. 17a the thread channel 76 is moved to the right from the filter bag axis 140. A slot 121 is arranged at right angles above the thread channel 76, which extends beyond the looping thread 113 to the right so that a free space 144 is created behind the thread 113, in which there is space for a sliding pin 124 arranged on a lever 123. On the left side, the slot 121 extends over the left hole of the later connection 136 (defined in Fig.10f ) at least by the diameter of the sliding pin 124.

During the rotary movement of the central turret 13, the sliding pin 124 is stationed in an area outside the enveloping circle 14. After this rotary movement has stopped, it is moved by a lifting movement 145 of the sliding axis 122 over the free space 144 of the elongated hole 121 and then by a rotation 146 (see Fig. 17b ) of the sliding axis 122 is inserted into this free space 144. Then (see Fig. 17c ) by a further lifting movement 145 of the sliding axis 122, the thread 113 is pulled out to form a loop 153 (not shown) with a piece of thread 154 running above, the thread arch 134 around the sliding pin 124 and a lower piece of thread 154a. The thread for this is taken from the thread end 126 by appropriate control of the thread clamping and braking stamps 147 and 148, which are known from variant A. The thread locking pin 156 is to be aligned perpendicular to the thread 154, as in variant B. It is shown coming from above - from the bag head 118. The thread locking pin 156 can also come from "below" and can be operated, for example, via a sliding axis, which will not be discussed in more detail since it is practically the same as the sliding axis 122 (see Fig. 17 ) has already been explained. The reference number 207 shows the thread thrust 125 over the free space 144 and 207 the thread thrust 125 over the hT

A certain length of thread is required for the link 136. The required length of thread can be released from the thread pieces 154 and 154a by means of a controlled lifting movement 145 of the sliding pin 124. Any additional length of thread required comes, as already shown in variant A is known from the thread end 126 provided for this purpose.

Note: The functions used are already known from versions A and B.

Station 4 : can be used to check whether the thread is stuck to the label and/or bag head.

In summary, it is stated that one aspect of the invention can be seen in the fact that before knotting the label with a thread 92, 93, 113, 126, 135, 138, 139, the label 81 is inserted under a folded-over head closure 25 of the bag 20 before and during the connection with the thread 92, 93, 113, 126, 135, 138, 139.

A further aspect of the invention relates to the tension-free thread transport, because the thread 92, 93, 113, 126, 135, 138, 139 is transported together with the label 81 linked by thread loops to a station 9 of the central turret 13, in which it is looped around the bag 20 and that the connection between the label 82 and the thread 93 is free of tension during the execution of the method.

A third aspect of the invention relates to the sealing of the tube 73 equipped with the piles 72 of the filling material in the station 12, which is inserted into the central turret 13 and in the process the two side walls 21 are erected in order to form the characteristic knee of the bottom fold 23, so that a filter bag pre-form 24 aligned with the label 82 is formed.

List of reference symbols

• 1 central turret station at 1 o'clock position
• 1b Bag chambers open at the top
• 1c bag finished
• 1d bag hanging on label
• 1e bag cut (knurled seam
• 2 Central turret station at 2 o'clock position
• 3 Central turret station at 3 o'clock position
• 4 Central turret station at 4 o'clock position
• 5 Central turret station at 5 o'clock position
• 6 Central turret station at 6 o'clock position
• 7 Central turret station at 7 o'clock position
• 8 Central turret station at 8 o'clock position
• 9 Central turret station at 9 o'clock position
• 10 Central turret station at 10 o'clock position
• 11 Central turret station at 11 o'clock position
• 12 Central turret station at 12 o'clock position
• 13 Central turret
• 14 Enveloping circle of the central turret 13
• 20 double chamber bags. Filter bags
• 21 Side wall in the filter bag blank
• 22 protruding side wall
• 23 Bottom fold
• 24 Filter bag pre-forming
• 25 Head fold at the bag head, "head closure"
• 26 Bag chamber
• 30 Direction of rotation clockwise revolver
• 70 Dosing device
• 71 Filter paper web
• 72 filling piles
• 73 Flat hose for hose section 74
• 74 Hose section for filter bag pre-forming 24
• 75 Pouch pocket in central revolver 13
• 76 Thread channel in the thread catcher 100
• 81 Label web
• 82 Isolated label from 81
• 83 Pocket for label 82
• 84 Support arm/beam fixed
• 85 Angle lever including support arm controlled
• 86 folding shoulder
• 88 knots
• 89 Needle
• 90 Needle Eye
• 91 Thread roll
• 92 Thread strand coming from 91
• 93 thread sections per filter bag
• 94 Thread pliers
• 94-1 Thread pliers in open position
• 94- 2 Thread pliers as thread brake
• 94-3 Thread pliers fix the thread
• 95 Thread loop in the revolver Thread strand 92
• 96 Thread path between station 9 and 10
• 97 Thread deflection with brake (start of thread loop 95)
• 98 Thread deflection with brake (end of thread loop 95)
• 99 Thread brake after thread roll 91 for feeding thread strand 92
• 100 thread catchers
• 101 Thread companion and apex of thread loop 95
• 104 Label scissors - Label web cutting point 81
• 105 Paper scissors - scissors bag tube
• 106 Thread scissors - Thread station 1
• 108 Slider for thread loop 95
• 109 Hose inserter
• 110 Insertion device for label strip
• 113 wrapping thread in 25
• 114 Slider Label 82 Station 10
• 115 knotters
• 117 Hook needle
• 118 Top edge of bag/head closure
• 119 Hole for hook needle 117 coming from label
• 120 Hole for hook needle 117 for coming from thread end 126
• 121 Long hole
• 122 Sliding axis for thread tensioning
• 123 Lever for slider 124
• 124 Slide pin (thread tension pin)
• 125 Thread slider= 122+123+124
• 126 Thread end of 92 (and 93)
• 129 Movement axis of 109
• 131 Loop for the link 136
• 133 free
• 134 Thread bow in slot 121 for linking
• 135 Pull thread for linking
• 136 Link
• 137 Guide wall machine side >169
• 140 Bag axis, longitudinal axis
• 141 Hole for clamping stamp 147
• 142 Hole for brake piston 148
• 143 Tappet thread brake / channel
• 144 Clearance for sliding pin 124
• 145 Stroke movement total stroke sliding axis 122
• 147 Clamping stamp in bore 141
• 148 Brake piston in bore 142
• 149 Turntable in thread catcher 100
• 150 Guide channel in turntable 149 - Recess
• 151 Thread in recess 150
• 152 edges in turntable 149 (deflections)
• 153 Loop in slot 121=154+
• 154 "upper" branch of the thread loop 153 Tappet for thread channel
• 154a lower thread piece
• 155 Hole for retaining pin 156
• 156 Thread retaining pin/locking pin (lower branch of thread loop 153)
• 157 Thread channel in the turntable 149
• 158 Tappet for elements in thread channel 7 (clamping bolt)
• 159 Push rod for thread clamping in channel
• 160 Spring for thread clamping in channel
• 161 Hole for thread retainer when clamping
• 162 Pin thread retention during clamping
• 163 Pressure plate thread clamping/braking
• 164 piece of thread at station 12
• 165 Thread separation in station 1
• 167 Lever for turntable 149
• 168 Floor in the thread channel 76
• 169 outer channel wall operator side far machine
• 171 breakthrough through dkb over 119
• (172 piercing through dkb over 120)
• 173 thread at 119 in thread channel 76
• 174 thread at 120 in thread channel 76
• 175 Hole thread tightening
• 176 Tappet or slider for thread tightening
• 177 Loop material intake for tightening
• 178 Milling enlarged hole in wall
• 179 Direction of hook needle (forward and backward) in Fig. 13a, c added
• 180 Cutout for thread on front
• 181 Recess in hook needle 117
• 182 Pressure plate for 153
• 183 Recess in the thread channel for pressure plate 163
• 184 Loop b. Thread end 126 f. Link
• 188 Flange for mount revolver 13
• 189 Cam disc thread pliers 94
• 197 End/folding edge folding shoulder 86 for 196
• 198 Angle Edge 197
• 199 Overhang of side wing over central axis 140
• 200 over 118 protruding tip
• 201 around 118 folded lace
• 203 Loop=Thread loop Brake 99-Needle 89
• 204 Rotary axis hook needle
• 205 upper edge protruding side wall 196
• 207 Thread shift.125 over clearance 144
• 208 thread shift.125 over h. T.
• 219 Rotation 90°

Claims (27)

1. Method for producing a bag (20) for hot drinks formed by folding by connecting a thread (92, 93, 113, 126, 135, 138, 139) to a label (81) and the bag (20) by means of a needle (89, 117) by forming a loop (131, 153, 154) for producing a link (136), characterized in that before knotting the label with a thread (92, 93, 113, 126, 135, 138, 139) and before and/or during the connection with the thread (92, 93, 113, 126, 135, 138, 139), the head closure (25) of the bag (20) is folded over the label (81). 2. Method for producing a bag (20) for hot drinks formed by folding by connecting a thread (92, 93, 113, 126, 135, 138, 139) to a label (81) and the bag (20) by means of a needle (89, 117) by forming a loop (131, 153, 154) for producing a link (136), characterized in that the uncut thread (92, 93, 113, 126, 135, 138, 139) extending from the thread roll (91) is transported together with the label (81) linked by thread loops to a station (9) of a central turret (13) in which it is looped around the bag. 3. Method according to claim 1 or 2, characterized in that a filter bag tube (73) filled with filling material (72) for producing the bag (20) is brought to the label (81) and is formed around it. 4. Method according to one of claims 1 to 3, characterized in that in a first process step, the label (81) from the endless label strand (82) is placed in the central turret at a first position (8) and separated, that in a second process step an endless thread strand (91) is transferred to the central turret (13) at a subsequent second position (9), that in a third process step the linking of the separated label (81) with the uncut endless thread strand (91) is carried out, that in a fourth process step in the subsequent position (12) of the central turret (13) the production of the bag (20) takes place, and that in this process step the later bag (20) is pushed through a pre-tensioned thread section (93) which thus wraps around the bag (20). 5. Method according to one of the preceding claims, in particular claim 4, characterized in that following the aforementioned method steps, the formation of the head closure (25) takes place in a fifth method step, and that the label (81) is clamped between the multiple folded head closure (25) of the bag (20). 6. Method according to one of the preceding claims, in particular claim 5, characterized in that the label (81) is clamped between the rear side wall of the bag (20) and the folded-over head closure. 7. Method according to at least one of claims 1 to 6, characterized in that in a sixth method step the thread protruding from a thread catcher (100) is attached to the bag (20) 8. Method according to at least one of claims 1 to 7, characterized in that the thread (92, 93) remains continuous until it is severed in a station 1 of the central turret (13) between a thread pliers (94) and the label (82). 9. Method according to one of the preceding claims, in particular claim 8, characterized in that the thread (92, 93, 113) is looped around the bag (20) when the tube piece (73, 74) is pushed into a bag pocket (75) on the central turret (13) and in a further process step into a slot of the thread catcher (100). 10. Method according to at least one of claims 1 to 9, characterized in that the position of the label (82) on the central turret (13) is selected such that the tube section (74) for the filter bag pre-forming (24) is formed as a folded head closure (25) opposite. 11. Method according to at least one of claims 1 to 10, characterized in that in order to avoid collisions of the sewing tools with the central turret (13), a side wall (22) of the label (82) folded into the head closure (25) protrudes by a suitable distance from the rotating central turret. 12. Method according to one of the preceding claims, in particular claim 11, characterized in that the label (82) is only half inserted into the associated station 8 of the central turret (13) and in the subsequent station 9 the thread (93) is sewn onto the label (82). 13. Method according to one of claims 1 to 12, characterized in that the bag-forming tube section (74) of the tube (73) filled with filling material (72) is pushed downwards via a slideway into a bag pocket (75) arranged in the central turret (13) by means of a tube inserter (109). 14. Method according to one of claims 1 to 13, characterized in that in station 8 the label (82) - projecting outwards - is inserted into a label pocket (83) and separated from a label web (81). that in station 9 a thread strand (92) coming from a thread reel (91) is fed and knotted to the label (82), that between stations 9 and 10 the thread strand (92) is grasped by a thread tong (94), and that in station 10 the label (82) protruding from the label pocket (83) is completely inserted into the label pocket (83). 15. Method according to one of the preceding claims, in particular claim 14, characterized in that for the continuation of the part located at the level of the (next) station 1, the thread strand (92) between the thread pliers (94) and the label (82) is severed with the thread scissors (106) in order to release it for station 12,
that in the station 12 the tube (73) equipped with the heaps (72) of the filling material is then pushed into the revolver (13) and the two side walls (21) are raised in order to form the characteristic knee of the bottom fold (23), so that a filter bag pre-form 24 aligned with the label (82) is formed. 14. Method according to one of the preceding claims, in particular claim 13, characterized in that in continuation of the method, the thread strand (92) - withdrawing from station 1 - is on the one hand looped around the formed filter bag preform (24) to form a looping thread (113) and on the other hand slides into a thread channel (76) in the thread catcher (100) as far as the channel bottom thereof. 15. Method according to one of the preceding claims, in particular according to claim 14, characterized in that in continuation of the method in station 1, first the continuous thread strand (92) is severed and that by this cut with a thread scissors (106) in the vicinity of the label knot (88) the thread section (93) for the filter bag pre-forming (24) in station 1 is separated. 16. Method according to one of claims 1 to 15, characterized in that the sensitive thread strand (92) is forcibly guided up to station 1, and in the process the looping thread (113) is formed without being exposed, so that it is positioned exactly for the knotting (88) on the head fold (25). 17. Method according to one of claims 1 to 16, characterized in that in continuation of the method according to claim 16 in stations 1 and 2 on the filter bag preforming (24) the head fold (25) is produced by multiple folding around folding shoulders (86) on the label pocket (83), so that the label (82) assumes a defined position inserted into the head closure (25) of the later filter bag (20). 18. Device for producing a bag (20) for hot drinks formed by folding by connecting a thread (92, 93, 113, 126, 135, 138, 139) to a label (81) and the bag (20) by means of a needle (89, 117) with formation of a loop (131, 153, 154) for producing a link (136), characterized in that before knotting the label with a thread (92, 93, 113, 126, 135, 138, 139), the label (81) can be inserted under a folded-over head closure (25) of the filter bag (20) before and during the connection with the thread (92, 93, 113, 126, 135, 138, 139). 19. Device for producing a bag (20) for hot drinks formed by folding by connecting a thread (92, 93, 113, 126, 135, 138, 139) to a label (81) and the bag (20) by means of a needle (89, 117) with the formation of a loop (131, 153, 154) for producing a link (136), characterized in that the thread (92, 93, 113, 126, 135, 138, 139) can be transported together with the label (81) linked by thread loops to a station (9) of a central turret (13) in which it is looped around the bag and that the connection between the label (82) and the thread (93) is free from tensile stresses during the implementation of the method. 20. Device according to claim 18 or 19 for carrying out the method according to one or more method claims 1 to 17, characterized in that a provision of labels (82) takes place in the station (8) of the central turret (13) and that the frontmost label (82) of a label web (81) can be inserted into a pocket (83) between a setting-up arm (84) arranged on the central turret (13) and a folding shoulder (86) by means of an insertion device (110). 21. Device according to one of claims 18 to 20, characterized in that
the insertion device (110) inserts the label (82) into the pocket (83) only so far that the separation point and the label scissors (104) between the label web (81) and the separated label (82) are located outside the envelope circle (14) of the central turret (13). 22. Device according to one of claims 18 to 21, characterized in that an axially radially displaceable thread pliers (94) is mounted behind the setting-up arm (84) which is fixed with respect to the direction of rotation (30). 23. Device according to claim 22, characterized in that the thread pliers (94) have three working positions: Position 1: 94-1 Open. Position 2: 94-2 When pressed lightly, it acts as a thread brake. Position 3: 94-3 Tightly closed, fixes the thread strand 92. 24. Device according to one of claims 18 to 23, characterized in that the thread can be pulled as an endless thread strand (92) from a thread reel (91) via a thread brake (99) through a needle eye (90) of a needle (89) to the thread pliers (94), and that the pulling takes place on the one hand by the rotation of the central turret (13) and on the other hand by a slider (108) during the subsequent formation of the thread loop (95). 25. Device according to one of claims 18 to 24, characterized in that the thread strand (92) between the successive labels (82) can be brought to the length of the thread section (93) which is needed for a later bag (20), and that the thread strand (92) can be stored in a thread loop (95).

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