Device for producing a bag provided with a wrapping and containing a brewable material

Description

[0001] The present invention relates to a device for producing a packaging unit comprising a bag containing a brewable material, which is provided in a usually aroma-tight wrapping.

[0002] A generic device with the features described in the preamble is known from EP 2 231 479 B1. In this previously known device, the bag is first placed in a wrapping station between opposing legs of a wrapping material supplied as a flat web. The web is then folded around the bag and cut from the supplied wrapping material, so that a piece of wrapping material of a pre-cut length encloses the bag. By folding the wrapping material, one edge of the bag's wrapper is already formed. However, it is necessary to form a U-shaped sealing seam so that the wrapper is closed circumferentially around the bag and an aroma-tight packaging of the brewable material within the bag can be achieved.

[0003] This brewable material is typically tea or other infusion material made from dried powder or leaves, the quality and flavor of which can be affected by environmental influences, so the aforementioned aroma-tight packaging may be necessary. This also applies to the present invention.

[0004] In the aforementioned prior art, the U-shaped sealing seam is formed by means of a sealing device which has a plurality of sealing units on the outer circumferential surface of a carousel, each of which has sealing jaws which can be pivoted relative to one another and which receive the wrapping together with the bag and are closed as part of a step-by-step rotational movement of the carousel in order to seal the U-shaped edges of the wrapping by welding during the rotational movement of the carousel and to deliver the thus closed wrapping to another station.

[0005] From EP 3 330 191 A1 and EP 0 095 542 A1 welding devices with rollers are known, the axes of rotation of which are provided on opposite sides with respect to the web to be welded.

[0006] The previously known solutions still offer room for improvement.

[0007] In view of this, the present invention provides a device having the features of claim 1.

[0008] The device according to the invention comprises, in a manner known per se, a bag-making device. This device need not differ from the bag-making device described in EP 2 231 479 B1. However, it can alternatively also be designed according to EP 2 626 318 A1, EP 1 479 612 A1, EP 2 572 996 A1, or EP 1 153 833 A1. The bag-making device can be designed such that, together with the bag, a thread is also connected to the bag, the other end of which is provided with a label, as is known, for example, from EP 2 231 479 B1.

[0009] The device according to the invention further comprises a sealing station for enclosing the bag, optionally together with the thread and the label, in a wrapper. This sealing station is typically designed such that the bag is accommodated in the wrapper in an aroma-tight manner. The wrapper as such is known, for example, from DE 296 09 717 U1. In the embodiment described therein, the wrapper is also formed by wrapping the bag, optionally together with the thread and the label, with this unit consisting of the wrapper and the bag being sealed to form a U-shaped seam. For this purpose, the sealing station can join the opposing layers of the wrapper by welding. However, other types of connection, such as knurling or gluing, are also conceivable. These types of connection can also be applied in combination.

[0010] The device according to the invention has a sealing station with a first and a second shaft, wherein the shafts each carry at least one associated sealing jaw. Typically, the first shaft has a plurality of first sealing jaws, and the second shaft has a plurality of second sealing jaws correspondingly associated with these first sealing jaws. The first and second sealing jaws each form a sealing element for sealing the envelope. In other words, the two first and second sealing jaws are provided as a pair to seal the bag within the envelope. Preferably, the sealing element formed by the two sealing jaws is designed to form a U-shaped sealing seam, so that two opposing longitudinal edges and a transverse edge extending transversely thereto can be sealed.In the device according to the invention, the wrapping is also usually folded over in order to initially provide the bag between opposing legs of the wrapping, which are connected to one another by the U-shaped sealing seam, preferably connected to one another in such a way that the bag is received in the wrapping in an aroma-tight manner. For this purpose, it is necessary for the sealing seam to run continuously from one end of the folded edge to the other end of the folded edge. It is not necessary for the seam to be continuous. Rather, several seams can be provided alternately, each of which adjoins one another in a fluid-tight manner, optionally also offset transversely to the edge of the wrapping.

[0011] The first and second shafts of the device according to the invention are movable relative to one another. This particularly refers to mobility in the rotation or pivoting direction of the shafts. This is because the relative mobility of the first and second shafts relative to one another allows the sealing jaws of one of the sealing elements to be spaced apart from one another to receive the bag and the wrapping, or to be placed against one another to seal the wrapping. The sealing station of the device according to the invention preferably has one, particularly preferably several, sealing jaws that are essentially rigidly attached to the associated shaft.Insofar as this development is based on essentially rigidly attached sealing jaws, it should be noted that, to compensate for tolerances, at least one of the sealing jaws of the sail element can be elastically supported relative to the associated shaft such that the two sealing jaws can abut each other with a certain pretension in the position referred to below as the sealing position, in which the sealing jaws abut each other to seal the envelope. For this purpose, according to a preferred development of the present invention, a pretensioning element is proposed, which can be assigned to one or both sealing jaws. The elastic element can also be assigned to a first or second shaft.

[0012] In contrast to the aforementioned prior art according to EP 2 231 479 B1, the inventive solution does not have a carousel with sealing elements mounted on the carousel, each comprising two sealing jaws, one of which is arranged so as to be pivotable relative to the other. Rather, the inventive solution has two sealing jaws assigned to different shafts, each of which forms a sealing element and can be placed into the sealing position or a receiving position by rotating the shafts holding the respective sealing jaws relative to each other, which allows the bag and the wrapping to be received between the sealing jaws.

[0013] The device according to the invention accordingly has fewer parts than the one known from EP 2 231 479 B1, which are moved in a rotating manner as the sealing station advances. As in the previously mentioned prior art, the respective sealing element can be pivoted or rotated in steps, which is associated with considerable negative and positive acceleration values. Thus, the possibility of a considerable weight reduction compared to the generic prior art results in the possibility of an accelerated movement of the rotatable components of the sealing station. While in the previously known prior art at least one sealing jaw per sealing element must be articulated in order to move the two sealing jaws of an individual sealing element into the receiving position or the sealing position, the sealing jaws according to the solution according to the invention can be connected essentially rigidly to the shafts.A motor for adjusting the pivoting sealing jaw can also be dispensed with, as can a control system associated with the motor, as is implemented in the prior art. EP 231 for 79 B1.

[0014] Overall, the present invention can be manufactured with a significant reduction in the number of rotatably mounted parts, resulting in a lighter weight and a simpler design. This certainly applies to the rotatably mounted parts for generating the receiving position and the sealing position, or for sealing the casing when the casing layers are positioned opposite one another.

[0015] With a view to further simplifying the device according to the invention, a preferred embodiment of the present invention proposes that the two shafts be driven via a common drive shaft. This embodiment offers the further advantage that, through forced coupling or forced guidance during operation of the drive shaft, the first shaft executes a predetermined sequence relative to the second shaft, which reduces the possibility of faulty control of the moving elements of the sealing station and therefore increases the durability and reliability of the device according to the invention.

[0016] According to the present invention, the two shafts are coupled via a positive guide. The positive guide comprises a sliding sleeve, which will be discussed in more detail below. The sliding sleeve is slidably held on the first shaft and has form-locking elements on its end face which can be brought into engagement with or are in engagement with associated form-locking counter-elements formed on the second shaft. As a result, the sliding sleeve is coupled to the second shaft in a rotationally fixed manner. The form-locking elements and the form-locking counter-elements as well as the displaceability of the sliding sleeve are preferably coordinated with one another such that the form-locking between the sliding sleeve and the second shaft can also be canceled by longitudinal displacement of the sliding sleeve when the form-locking elements or form-locking counter-elements are disengaged.

[0017] In a preferred embodiment of the present invention, the form-locking elements and the form-locking counter-elements preferably have mutually associated guide surfaces which extend in the axial direction of the shafts, wherein the sleeve guide between the sliding sleeve and the first shaft has guide surfaces which extend obliquely to the axial direction of the shaft. When the sliding sleeve is displaced in the axial direction, this design does not result in any relative movement between the sliding sleeve and the second shaft in the circumferential direction. However, the sliding sleeve is pivoted relative to the first shaft due to the obliquely designed sleeve guide. As a result of these guide surfaces, when the sliding sleeve is displaced axially, a relative displacement of the first and second shafts to one another in the circumferential direction also results.

[0018] In an alternative design that achieves the same effect, the guide surfaces of the form-locking element and the form-locking counter-element are provided so as to extend obliquely to an axial direction of the shafts. The sleeve guide can extend coaxially to the axial direction of the shafts or obliquely to it. The obliqueness of the respective guide surfaces is adjusted according to the desired relative pivotability of the sealing jaws of one of the sealing elements.

[0019] In the two alternatives discussed above, an axial relative movement between the sliding sleeve and the second shaft also causes an axial relative movement to the first shaft. The first shaft and the second shaft are preferably positioned at a predetermined distance in the axial direction. The first and the second shaft can, for example, each have turntables to which the sealing jaws assigned to them are essentially rigidly attached. The clear distance between the two turntables preferably corresponds to the distance in the axial direction between the attachment-side ends of the corresponding sealing jaws. The sealing jaws themselves can project beyond the turntables on one or both sides in the axial direction, or can be provided between these turntables.

[0020] According to a preferred development, the sliding sleeve is provided with a drive ring that interacts with a guide mounted on the drive shaft in a rotationally fixed manner for axially displacing the sliding sleeve. This guide, mounted on the drive shaft, is preferably designed in the manner of a slotted guide that axially surrounds the drive ring on both sides and imposes a predetermined axial path on this drive ring relative to the second shaft via the movement of the drive shaft and the sliding sleeve in the circumferential direction. This results in a fixed displacement path of the sliding sleeve for every angle of rotation of the drive shaft.

[0021] According to a preferred embodiment of the present invention, the first or second shaft is rotatable exclusively in one drive direction. Such a development can be achieved, for example, by assigning a ratchet arrangement to the first or second shaft, which interacts with a ratchet toothing that allows rotation of the corresponding shaft in one drive direction, but prevents rotation in the opposite direction by locking the toothing.

[0022] According to a further preferred embodiment of the present invention, the first shaft is driven by the second shaft. This forced coupling can be achieved either by appropriately dimensioning the sleeve guide and the form-locking elements or form-locking counter-elements such that, in the closed position of the sealing elements, the torque is transmitted from the first shaft via the second shaft through the end surfaces of the guides on the sliding sleeve.

[0023] Alternatively, the torque required to drive the first shaft can be transmitted via the second shaft through the adjacent sealing jaws. Thus, the torque required to drive one shaft driven by the other shaft is transmitted via the adjacent sealing jaws.

[0024] According to a preferred embodiment of the present invention, the sealing station is assigned a clamping device that is movable relative to at least one of the sealing jaws. This clamping device clamps the bag together with the wrapping material before the sealing jaws close. The clamping device can, for example, be provided in the center of a U-shaped sealing jaw.

[0025] As in the prior art, the wrapping in the present invention can be formed by a film that creates an aroma-tight package around the bag. However, the wrapping can be made of another material that provides a certain degree of protection for the bag, for example, to protect the bag as a food product from direct contact by third parties until the wrapping is opened and the bag is removed. Thus, the wrapping material can also be paper, gauze, or a perforated film.

[0026] In the case of a plastic film wrap, sealing can be achieved by welding the two layers of the wrapper material together. A non-sealable material forming the wrapper can be provided with a sealable coating or strip at the location where the welding is to take place. Sealing can also be achieved by knurling, embossing, or other joining techniques for connecting two layers.

[0027] Further details and advantages of the present invention will become apparent from the following description taken in conjunction with the drawings, in which: Figure 1 is a side view of essential parts of an example for producing a wrapped bag; Figure 2 is a side view according to Figure 1 in enlarged view; Figure 3which in the Figure 1 and 2illustrated initial position of the example Figures 4a-4n in a perspective side view; different phases of operation of the example in side views or perspective side views according to the Figure 2 and 3 ; Figure 5 is a perspective side view of an embodiment of the sealing station according to the claimed invention in a first position; Figure 6 is a side view of the sealing station according to Figure 5 with further details of the embodiment in a second position and Figure 7 a side view according to Figure 7 in a third position.

[0028] The Figure 1 The example shown has a bag making device designated by reference numeral 2 and a sealing station designated by reference numeral 100.

[0029] The bag manufacturing device 2 comprises a carousel with several receptacles 4 rotating about an axis for receiving a water-permeable envelope, which is formed to form the bag, containing a scaldable material and is usually connected with a thread and a label. Regarding the individual stations and their design, reference can be made to the prior art, for example, EP 2 231 479 B1 or WO 01 / 62600 A1. Reference numerals I to VI denote Figure 2 Various positions are indicated in which the holder 4 can be located to receive and process the various components of the finished bag or bag to be finished. Elements involved in this process are not shown for the sake of clarity. In position VI, the bag is finished.

[0030] The Figures 1 to 3show elements of a bag handling device, designated by reference numeral 10, and a wrapping material handling device, designated by reference numeral 20. The wrapping material of the example shown is an aroma-tight film. Thus, the following description refers to a film handling device 20. The bag handling device 10 comprises two approximately parallel arms 12, 13, which are articulated to one another and coupled to a common drive device 30 via coupling rods 14.This common drive device 30 has various cam discs 32, which are rotationally fixedly mounted on a common drive shaft 33 of the drive device 30 and are coupled to pickups 34, in which the outer circumferential surfaces of the cam discs 32 each roll. The pickups 34 are each pivotably mounted on a common bearing axis 36 and are provided with a lever 37, which is pivotally connected to the associated coupling rod 14. The coupling rods 14 act on the arms 12 via levers.

[0031] The drive shaft 30 actuates both the individual components of the bag handling device 10 and the components of the film handling device 20. Thus, both handling devices 10, 20 are provided with a common drive and are forcibly synchronized.

[0032] The sealing station 100 is assigned first sealing jaws 102 and second sealing jaws 104. Details of the sealing station are described with reference to the Figures 5 to 7 For the following description with reference to the Figures 1 to 4 The function of the sealing jaws 102, 104 is only relevant insofar as the two sealing jaws 102, 104 can be moved relative to each other and placed against each other to seal the bag in a film wrapping and can be pivoted in the opposite direction to release the sealed bag or to pick up a new bag with the film, wherein the paired sealing jaws 102, 104 can be pivoted about a common axis. Figures 1 to 4 The sealing station 100 is shown only schematically. The actual design of the embodiment differs from this and is Figures 5 to 7 can be found.

[0033] How Figure 3As is illustrated, the film handling device 20 has a leading film handling element identified by reference numeral 21 and a trailing film handling element identified by reference numeral 22, each of the elements 21, 22 having film handling arms 24 and 25 provided in pairs, each pair being pivotably mounted and independently drivable and each having inwardly projecting clamping projections, the clamping projection of the leading handling arms 24 being provided with reference numeral 26 and that of the trailing handling arms 25 being provided with reference numeral 27.

[0034] The arms of the bag handling device 10 are designed as a front bag handling arm 12, which carries a clamping shoe 15, and as a rear bag handling arm 13, which actuates a clamping spring 16 which cooperates with the clamping shoe 15 and is pivotable relative to the clamping shoe 15. These elements are shown in the Figure 5 ff. described in detail. Another actuating arm 17 pivots the clamping shoe 15 relative to the front bag handling arm 12.

[0035] The Figure 3 shows a wrapping material 40 in the form of a film, fed tangentially with respect to the axes of rotation of the bag manufacturing device 2 and the sealing station 100 as a flat web, which in the phase according to Figure 3 between the leading clamping projection 26 and the trailing clamping projection 27 by the relative pivoting movement of the two handling arms 24, 25 relative to each other. This position represents the starting position for the insertion of the film 40 between the two sealing jaws 102, 104. It is correspondingly in Figure 2 , wherein in this figure a bag to be placed between the sealing jaws 102, 104 is identified by reference numeral 42. The arms 12, 13, 17 are omitted for illustration purposes.

[0036] As can be seen, the film 40 is clamped and gripped in its central region between the two leading and trailing clamping projections 26, 27. During this phase, the clamping shoe 15 with the clamping spring 16 is inserted into the corresponding receptacle 4 for gripping the bag 42. The two sealing jaws 102, 104 do not yet enclose a movement path of film 40 and bag 42, designated by reference symbol B. In fact, the two sealing jaws 102, 104 are located above this movement path B. This movement path B essentially runs as a radial line that intersects the pivot point of the carousel of the bag-making device 2. The movement path B extends in a straight line between the bag-making device 2 and the sealing station 10.

[0037] In the Figure 4aIn the phase shown, the two handling arms 24, 25 have already been pivoted in the direction of the sealing station 100, taking along the film 40. To a lesser extent, the clamping shoe 15 and the clamping spring 16 have been driven into the receptacle 4. In the sequence between Figure 4b and 4a The clamping spring 16 for clamping the bag 42 between the clamping shoe 15 and the clamping spring 16 was pivoted, while the clamping shoe remained in the receptacle. The carousel of the bag-making device 2 remained stationary. The same applies to Figure 4c which is significantly higher than Figure 4b shows that the film 40 has already advanced a certain distance on the movement path B in the direction of the sealing station 100, whereas the bag 42 remains in its holder 4. The film 40 accordingly runs ahead of the bag 42.

[0038] Only in the representation according to Figure 4dBoth components of the packaging unit to be produced, consisting of film 40 and bag 42, are simultaneously moved between the sealing jaws 102, 104. These now enclose the movement path B between them. Figure 4a shows the beginning of the movement of the bag 42 on the movement path B.

[0039] As from Figure 4eAs can be seen, the film 40 has been folded in a U-shape, whereby two opposing legs 44 of the film 40 are formed between a fold 45, which are increasingly brought closer to the bag 42 with increasing approach, i.e. insertion movement of the film 40 and the bag 42 between the sealing jaws 102, 104. The clamping spring 16 has released the bag 42. A guide (not shown in the drawing) which holds the film 40 at the edge when gripped by the film handling device 20 and which extends tangentially to the bag manufacturing device 2 is recessed in the center so that the clamping projections 26, 27 can grip the film 40. The guide also holds funnel-shaped tapered forming elements towards the sealing station 100, which cooperate with the film 40 to pivot the opposite legs 44 around the fold 45.

[0040] The Figure 4fshows the end position of the bag handling device 10 and the film handling device 20. In the Figure 4f In the position shown, film 40 and bag 42 have been placed in their sealing position between the two sealing jaws 102, 104.

[0041] Now the bag handling device 10 is pivoted in the opposite direction, ie according to the illustration according to Figure 4g clockwise U. The leading film handling element 21 remains stationary, whereas the trailing film handling element 22, like the bag handling device 10, is pivoted clockwise in order to remove the trailing clamping projection 27 from the area between the sealing jaws 102, 104. At about the same time, a particularly in Figure 4hThe clearly visible clamping device 46, which is provided for each of the sealing jaws 102, 104, presses from the outside against the legs 44 and clamps the film 40 and the bag 42 to the extent that the clamping shoe 15 and the clamping spring 16, which was previously actuated to release the clamping of the film 40 and the bag 42, are removed from the sealing jaws 102, 104. The film 40 and bag 42 are thus secured by the clamping device 46. The clamping device 46 is in the present case in the form of a clamping stamp, which is provided to be movable relative to the associated sealing jaw 102, 104, for example pivotable.

[0042] After the clamping shoe 15 and clamping spring 16 have released the bag 42 and the leading and trailing clamping projections 26, 27 have released the film 40, the film 40 and bag 42 are held between the sealing jaws 102, 104 solely by the clamping device 46, which is Figure 4iis clarified. With increasing pivoting movement of the trailing film handling element 22, the leading film handling element 21 is pivoted counterclockwise G and thus moved out of the area of ​​the sealing jaws 102, 104, which are narrower in their rear area, so that the leading clamping projections 26 of the leading film handling element 21 can be moved out of the area between the sealing jaws 102, 104 by this pivoting movement.

[0043] By pivoting the front and rear bag handling arms 12, 13 relative to each other, the clamping shoe 15 and clamping spring 16 pivot back into position VI below the holder 4. In other words, the clamping shoe 15 and the clamping spring 16 are not returned along the movement path B (cf. Figure 4j ).

[0044] In Figure 4kthe two sealing jaws 102, 104 have already been pivoted towards each other. Accordingly, the distance between the two sealing jaws 102, 104 is smaller than in the illustration according to Figure 4j .

[0045] Between the Figures 4k and 4l Both the carousel of the bag manufacturing device 2 and the sealing station 100 were pivoted counterclockwise. The sealing jaws 102, 104 are moved completely towards each other during this rotational movement. After bringing the sealing jaws 102, 104 into the Figure 4lIn the sealing position shown, the clamping devices 46 are released. In the sealing position, the edges of the film 40 projecting laterally and at the front of the bag 42 are clamped between the sealing jaws 102, 104 and are welded together by the action of heat. While the sealing station 100 is rotated, a new film 40 is fed between the leading clamping projection 26 and the trailing clamping projection 27 by a film feed device 50, schematically shown in Figures 1 and n by two drive rollers clamping and advancing the film 40, to which a schematically shown cutting device 51 is assigned (cf. Figures 4l , 4m ). By rotating the carousel of the bag-making device 2, the next holder 4 in a clockwise direction was moved to position VI. Figure 4nalready shows the approach of the open clamping spring 16 with the clamping shoe 15 towards the bag 42 and the approach of the leading and trailing clamping projections 26, 27 to clamp a central region of the film 40 located on the movement path B. Meanwhile, the sealing station 100 rotates and brings another set of first and second sealing jaws 102, 104 to enclose the movement path B and accordingly opposite the holder 4. The previously described cycle begins again. The cutting device 51 severs a length of the film 40 from a supply when the clamping projections 26, 27 grip the film 40.

[0046] The embodiment of the sealing station 100 according to the embodiment of the present invention will be described in more detail below with reference to the Figure 5 ff. explained.

[0047] Figure 5shows a perspective side view of the exemplary embodiment, which comprises a first shaft 101, which is assigned to a first sealing jaw 102, and a second shaft 103 provided coaxially with the first shaft 101 and assigned to the second sealing jaw 104. A sliding sleeve 106 is provided displaceably on the first shaft 101 and engages via form-locking elements 108 with associated form-locking counter-elements 110, which are provided at a front end of the second shaft 103.

[0048] The form-locking elements 108 form guide surfaces 112 extending in a purely axial direction relative to the shafts 101, 103. Correspondingly, the second shaft 103, with its form-locking counter-elements 110, forms corresponding guide surfaces 114.

[0049] The sliding sleeve 106 has an oblique slot 116 which extends through its circumferential surface and extends obliquely relative to the axial extent of the first and second shafts 101, 103, respectively, forming a correspondingly obliquely formed guide surface 117 and being penetrated by a guide pin 118 which is held in the guide slot 116 and forms with its outer circumferential surface a further guide surface 119 which cooperates with the guide surface 117.

[0050] At its end opposite the form-locking element 108, the sliding sleeve 106 has a drive ring 120 which is connected to a Figure 6 and 7 shown slider 121, the operation of which will be explained in more detail below.

[0051] The first and second shafts 101, 103 each pass through a bearing sleeve 122 for supporting the shafts 101, 103 on a gear housing 123. The first shaft 101 has a first rotary plate 124 at its free end, on whose outer circumference several of the first sealing jaws 102 are mounted at equal spacing from one another. The first sealing jaws 102 are mounted on the first rotary plate 124 in a substantially rotationally fixed manner.

[0052] In a corresponding manner, the second shaft 103 has a second rotary plate 128, on which several of the second sealing jaws 104 are mounted in a rotationally fixed manner. For this purpose, the second sealing jaws 104 are screwed relative to the second rotary plate 128. By loosening the screw connection, the alignment of the respective second sealing jaw 104 relative to the second rotary plate 128 can be adjusted. This allows the embodiment to be adjusted so that, in the case of a Figure 5In the sealing position shown, all first sealing jaws 102 rest against the associated second sealing jaws 104 in order to clamp the film 40 provided therebetween and forming the film packaging and to seal it via a U-shaped seam.

[0053] The sealing jaws 102, 104 are welding jaws in the present case, which are heated by a heater provided within the sealing jaws 102, 104 and form a sealing element 132.

[0054] Like the Figure 6 and 7 As can be seen, the slide 121 interacts via a guide roller 134 with a slotted guide provided as a groove 136, which is provided on a guide cylinder 138. The guide cylinder 138 is connected in a rotationally fixed manner to a drive shaft 140, which also drives two cam disks 142 in rotation, the cams of which engage in recesses of output disks 144 for the stepwise drive of the first and second shafts 101, 103.

[0055] Thus, the drive shaft 140 is moved continuously, whereas the shafts 101, 103 are rotated relative to each other and overall stepwise around a common axis of rotation.

[0056] A prestressing means can act between the first and second sealing jaws 102, 104 to apply the corresponding sealing jaws 102, 104 against each other under elastic prestress and with the interposition of the film 40. This elastic means compensates for any tolerance errors. The elastic means can, for example, elastically support at least one of the sealing jaws 102, 104. Alternatively, the second shaft 103 can also be formed from a torsionally elastic material.

[0057] In the Figures 5 to 7 The illustration of the separate clamping device 46 was omitted.

[0058] With the selected drive type, the first shaft 101 is driven directly via the driven disks 144, while the sliding sleeve 106 is driven by the interaction of the guide pin 118 with the oblique slot 116 and, due to the position of the sleeve 106, via the slide 121. By decoupling the drive movement of the drive shaft 140 due to the cam disks 142 on the one hand and the guide cylinder 138 on the other hand, a relative movement of the sealing jaws 102, 104 can occur even when the first shaft 101 is stationary. The sequence between the introduction of the film 40 together with the bag 42, the closing of the two sealing jaws 102, 104 and the sealing of the bag 42 between the film 40 results from the sequence of Figure 6 , 7 and 5 .

[0059] Between the Figure 6 and 7The sealing position is prepared with the first shaft 101 stationary and the relative movement of the sliding sleeve 106. The sealing jaws 102, 104 are placed against each other. The first sealing jaw 102 remains stationary, whereas the second sealing jaw 104 is pivoted by actuating the sliding sleeve 106. After the two sealing jaws 102, 104 are placed against each other, the first and second shafts 101, 103 pivot simultaneously. The position of the sliding sleeve 106 relative to the second shaft 103 remains unchanged. The guide pin 118, which is connected to the first shaft 101 in a rotationally fixed manner, carries the sliding sleeve 106 with it, so that the second sealing jaws 104 are also pivoted.

[0060] The inclined slot 116 and the guide pin 118 form an inclined guide 146, which realizes a forced guide that couples the two shafts 101, 103 with a fixed kinematics.

[0061] As an alternative to the illustrated embodiment, the second shaft 103 can also be assigned a drive with cam disks and driven disks, as is implemented in the illustrated embodiment for the first shaft 101. This also allows for an independent drive for the second sealing jaws 104, predetermined by the rotation of the drive shaft 140. However, even with this forced guidance, the first and second sealing jaws 102, 104 are driven and positively coupled solely via the drive shaft 140. Reference symbol list

[0062] 2Bag manufacturing device 4Receiver 10Bag handling device 12Front bag handling arm 13Rear bag handling arm 14Coupling rod 15Clamping shoe 16Clamping spring 17Actuating arm 20Film handling device 21Leading film handling element 22Trailing film handling element 24Leading handling arm 25Trailing handling arm 26Leading clamping projection 27Trailing clamping projection 30Drive device 32Cam disc 33Drive shaft 34Doffer 36Bearing axis 37Lever 40Film 42Bag 44Leg 45Fold 46Clamping device 50Film feed device 51Cutting device BMovement path UPivoting clockwise GPivoting counterclockwise I-VI Position of the holder 4 100 Sealing station 101 First shaft 102 First sealing jaw 103 Second shaft 104 Second sealing jaw 106 Sliding sleeve 108 Form-locking elements 110 Form-locking counter elements 112 Guide surface 114 Guide surface 116 Inclined slot 117 Guide surface of the inclined slot 118 Guide pin119Guide surface of the guide pin 120Drive ring 121Slider 122Bearing sleeve 123Gear housing 124First turntable 128Second turntable 132Sealing element 134Guide roller 136Groove 138Guide cylinder 140Drive shaft 142Cam disc 144Drive disc 146Illusive guide

Claims

1. A device for producing a bag containing a brewable material and enclosed in a wrapper, comprising a bag-making device (2) that is set up to make a bag (42) containing brewable material in a water-permeable wrapper, and comprising a sealing station having two sealing jaws (102; 104) movable relative to each other for sealing the bag (42) in a wrapping formed by a wrapping material (40), characterized in that the sealing station (100) comprises a first shaft (101) carrying at least one first sealing jaw (102), and a second shaft (103) carrying at least one second sealing jaw (104) cooperating with the first sealing jaw (102) for sealing the wrapping, the first and second shafts (101; 103) being movable relative to one another to space the sealing jaws (102; 104) of one of the sealing elements (132) for receiving the bag (42) and the wrapping material (40) apart from each other and to apply them against each other to seal the wrapping material (40), and that the two shafts (101; 103) are coupled via a constrained guidance, comprising a sliding sleeve (106), the sliding sleeve (106) being held displaceably on the first shaft (101), the sliding sleeve (106) being provided on the end face with form-locking elements (108), the sliding sleeve (106) being in engagement with associated form-locking mating elements (110) of the second shaft (103), and the sliding sleeve (106) being coupled to the first shaft (101) via a sleeve guide (116; 118).

2. The device according to claim 1, characterized in that the sealing jaws (102; 104) are substantially rigidly attached to the associated shaft (101; 103).

3. The device according to claim 1 or 2, characterized by a prestressing element which, when the sealing jaws (102; 104) are in contact, acts on at least one of the sealing jaws (102; 104) and holds the sealing jaws (102; 104) in contact with each other under prestressing.

4. The device according to one of the previous claims, characterized in that the two shafts (101; 103) are driven by a common drive shaft (140).

5. The device according to claim 1, characterized in that the sliding sleeve (106) has a drive collar (120) which cooperates with a slide (121) driven by the drive shaft (33) for axially displacing the sliding sleeve (106).

6. The device according to one of the previous claims, characterized in that the first shaft (101) and the second shaft (103) are each driven.

7. The device according to claim 6, characterized in that a torque required for driving the driven shaft (101; 103) is transmitted via the sealing jaws (102; 104) bearing against one another.

8. The device according to one of the previous claims, characterized by a clamping device (46) associated with the sealing station (100) movable relative to at least one of the sealing jaws (102; 104) to hold the bag (42) together with the wrapping material (40) between the sealing jaws (102, 104) prior to the closure of the sealing jaws (102, 104).