Device for cutting a flat track and device for producing a strand

Abstract

Device (11) for separating a flat web (6) made of a web material into a plurality of strips (14), comprising a separating device (12) and a deflecting device (13), wherein the separating device (12) comprises a first and a second roller (26, 28) cooperating with it, and wherein the outer surfaces (30, 32) of the rollers (26, 28) have alternately closed circumferential grooves (34) and blades (36) in the axial direction (A) of the respective roller (26, 28), and in an effective area the blades (36) of the first roller (26) engage in the grooves (34) of the second roller (28) and the blades (36) of the second roller (28) engage in the grooves (34) of the first roller (26), and the separating device (12) is configured to separate the flat web (6) into a plurality of adjacent strips (14). to separate, wherein the deflecting device (13) comprises at least one deflecting element whose webs (50) engage in the grooves (34) of the first or the second roller (26, 28),wherein the at least one deflecting element (54, 56) is designed sectionally as a plate-shaped deflector (62) which forms a closed surface downstream of the effective area of ​​the separating device (12) which extends in the axial direction (A) over at least two webs (50) and has a heating device.

Description

[0001] The invention relates to a device for separating a flat web made of a web material into a plurality of strips, comprising a separating device and a deflecting device, wherein the separating device comprises a first and a second roller cooperating with it, wherein the outer surfaces of the rollers alternately have closed circumferential grooves and blades in the axial direction of the respective roller, and in an effective area the blades of the first roller engage in the grooves of the second roller and the blades of the second roller engage in the grooves of the first roller, and wherein the separating device is configured to separate the flat web into a plurality of adjacent strips, and wherein the deflecting device comprises at least one deflecting element, the ribs of which engage in the grooves of the first or the second roller.The invention further relates to a device for producing a strand for the tobacco processing industry, comprising such a device for cutting a flat web.

[0002] A device for producing a strand, which includes a cutting device for separating a flat web, is disclosed, for example, in DE 1 954 036 A. The flat web is cut into parallel strips using a disc-knife cutting device. The strips are then bundled together in a strand and enclosed with a covering. In the known device, a flat web of reconstituted tobacco material is processed. The produced and enclosed strand is cut into pieces of predetermined length, so that rod-shaped smoking articles can be manufactured.

[0003] From US patent 5,025,814 A, a device is known which comprises a pair of cutting rollers for separating the flat web into a plurality of strips. The device also comprises guide combs positioned such that the tines of the combs extend into the spaces between adjacent blades of the cutting rollers. Furthermore, the device comprises cleaning combs whose tines also engage in the grooves between the blades.

[0004] From EP 4 241 941 A2, a device for separating a flat web made of a web material into a plurality of strips is known, comprising a separating device and a deflecting device, wherein the separating device comprises a first and a second roller cooperating with it, and wherein the outer surfaces of the rollers have alternating circumferential grooves and blades in the axial direction, and wherein, in an effective area, the blades of the first roller engage in the grooves of the second roller and the blades of the second roller engage in the grooves of the first roller, and wherein the separating device is configured to separate the flat web into a plurality of adjacent strips, and wherein the deflecting device comprises at least one deflecting element whose webs engage in the grooves of the first or the second roller, wherein the device is further developed bythat at least one deflector element is designed sectionally as a plate-shaped deflector, which forms a closed surface downstream of the effective area of ​​the separating device, extending in the axial direction over at least two webs.

[0005] It is an object of the invention to provide a device for separating a flat web and a device for producing a strand, wherein a reliable separation of the flat web into individual strips should be possible.

[0006] The problem is solved by a device for separating a flat web made of a web material into a plurality of strips, comprising a separating device and a deflecting device, wherein the separating device comprises a first and a second roller cooperating with it, and wherein the outer surfaces of the rollers have alternating circumferential grooves and blades in the axial direction, and wherein, in an effective area, the blades of the first roller engage in the grooves of the second roller and the blades of the second roller engage in the grooves of the first roller, and wherein the separating device is configured to separate the flat web into a plurality of adjacent strips, and wherein the deflecting device comprises at least one deflecting element whose ribs engage in the grooves of the first or the second roller, wherein the device is further developed bythat the at least one deflector element is designed sectionally as a plate-shaped deflector, which forms a closed surface downstream of the effective area of ​​the separating device, extending in the axial direction over at least two webs, and wherein the deflector device (13) has a heating device (150, 151, 152, 153), preferably with one, two, three or four heating elements or heating plates, which are preferably arranged on the plate-shaped deflector.

[0007] When separating a flat web from a web material, it frequently occurs in practice that strips become stuck in the grooves between the roller blades downstream of the working area and follow the direction of rotation of the roller. To prevent this, deflectors or combs, such as those known from US 5,025,814 A, are used to guide the strips from the bottom of the grooves back to the outside of the rollers. However, it has been found that individual strips are often not reliably guided by such known deflectors. One possible consequence is strip breakage, which leads to a disruption of the production process.

[0008] In the context of the invention, it was discovered that such disruptions to the production process can be effectively avoided by using a plate-shaped deflector designed as a closed surface and arranged downstream of the cutting device's operating area. The individual strips produced by the cutting device are guided on the surface of the plate-shaped deflector and can be further processed by downstream devices. The reliability of the device and the quality of the product produced with it—i.e., the numerous strips—can be improved. Additionally, heating the deflector, particularly its ribs, results in minimal contamination and reduces adhesion.

[0009] The plate-shaped deflector of the deflector device extends outside the rollers. The deflector's position is to be understood in light of the following explanations. The deflector device comprises at least one deflector element, and in many cases two, whose webs run partially within the grooves between adjacent roller blades. These sections or areas of the webs extend within the cylindrical surface of the roller. The outer circumferences of the roller blades define a cylindrical surface. The blades of the first roller define a first cylindrical surface, and the blades of the second roller define a second cylindrical surface. Viewed in a cross-section perpendicular to the rollers' axes of rotation, the first and second cylindrical surfaces overlap. The rollers' axes of rotation are parallel to each other and extend axially.The overlapping area of ​​the cylinder surfaces shall be referred to as the effective area. The plate-shaped deflector lies outside and downstream of this effective area. It lies outside the rollers, i.e., outside any area or volume enclosed by the first and second cylinder surfaces.

[0010] Advantageous embodiments are listed in claims 2 to 13.

[0011] According to an advantageous embodiment, the axial dimension of the plate-shaped deflector is greater than or equal to the axial dimension of the effective area. The plate-shaped deflector is thus dimensioned larger in the axial direction than the effective area of ​​the cutting device in this direction. This ensures that no strips produced by the cutting device fall off the edge regions of the plate-shaped deflector and are potentially lost in subsequent production steps. The reliability of the device with regard to uninterrupted production is further improved by this design of the plate-shaped deflector.

[0012] According to a further advantageous embodiment, the device is further developed in that the webs of the at least one deflector element are held on one side of the plate-shaped deflector and extend from the deflector towards their respective free ends into the grooves of the first roller or the second roller.

[0013] In other words, the deflector elements are designed such that their webs are only connected to each other on the outlet side, namely via the deflector located downstream of the effective area, but not on the inlet side. A deflector element designed in this way, which is only plate-shaped and closed downstream of the effective area, is significantly easier to install. For example, it is possible to install or replace the deflector element without having to dismantle the rollers of the separating device, or even either of the two rollers of the separating device. This is always necessary for devices that are closed on both the inlet and outlet sides. Since this is not required according to the aforementioned embodiment, significant advantages arise with regard to the installation and servicing of the flat web separating device.

[0014] Furthermore, it is specifically provided that the webs, when viewed in cross-section, are significantly taller than they are wide in order to give them the necessary mechanical stability. This applies in particular to deflector elements designed according to the above embodiment, namely those deflector elements whose webs are only held on one side by the plate-shaped deflector.

[0015] According to a further advantageous embodiment, it is provided that at least one web of at least one deflecting element, in particular all webs of at least one deflecting element, and furthermore in particular all webs of all deflecting elements, have a T-shaped cross-section.

[0016] If a separation plane is defined that is perpendicular to the shortest connection between the two axes of rotation of the rollers of the separating device, then one flat side of the T-shaped cross-sections is oriented towards this separation plane. This flat side is the top of the T when viewed upright. The cross-section of the webs is considered in a plane that is oriented transversely, and in particular perpendicularly, to a longitudinal direction of the respective webs. In this same plane, the webs are also considered with regard to the previously mentioned characteristic that they are taller than they are wide. The height of the webs is measured in one direction towards the separation plane. In other words, the webs have a larger dimension in a direction perpendicular to the separation plane than in a direction parallel to the separation plane.

[0017] However, if the ribs are taller than they are wide, dirt can easily accumulate, or when separating moister materials, adhesion can occur between the ribs and the groove flanks of the rollers, which in the worst case can block the separating device.

[0018] The design of the T-shaped cross-section of the guides is advantageous because only the portion of the guides that comes into contact with the strips separated from the flat web and pushes them out of the grooves of the rollers fills almost the entire width of the grooves. The portion extending further towards the bottom of the groove is significantly narrower (viewed in the axial direction of the rollers), which prevents contaminants from easily blocking the separating device. Contaminants can also fall out of the deflectors towards the bottom of the grooves and be removed, for example, by a downstream device, such as by scraping.

[0019] Furthermore, the device is designed in particular such that the deflecting device comprises a first and a second deflecting element which are arranged on opposite sides of a separation plane, wherein a shortest connection between a first axis of rotation of the first roller and a second axis of rotation of the second roller is perpendicular to the separation plane, wherein the two deflecting elements are arranged on both sides of the separation plane, in particular in a mirror-symmetrical manner to the separation plane.

[0020] Asymmetrical configurations are also provided, in which the two deflector elements are not arranged symmetrically to the separation plane. For example, one of the two deflectors is positioned closer to the separation plane than the other. This can be, in particular, the deflector located at a lower geodetic level. This deflector can be positioned, for example, in close proximity to, i.e., just below, the separation plane. This makes it possible to support the strips exiting the separation device from below, so that they can be fed into the subsequent process steps approximately within the separation plane.

[0021] Furthermore, it is specifically intended that the two deflectors diverge in a funnel shape downstream, i.e., in the process direction. Here too, an asymmetrical configuration is possible; for example, only the upper (geodesically higher) of the two deflectors can be curved, resulting in a funnel-shaped widening.

[0022] If the first and second rollers have the same radius, the separation plane is equidistant from both the first and second axes of rotation. For rollers with different radii, the separation plane is closer to the roller with the smaller radius. The first and second cylindrical surfaces intersect along two parallel lines. These two lines lie within the separation plane.

[0023] Therefore, one deflector element is provided for each roller. Any strips that may be present in the grooves between the blades as a result of the cutting process can be lifted out of the corresponding roller by the respective deflector element. The strips are then reliably guided onto the first or second deflector element.

[0024] Furthermore, according to another embodiment, it is provided that the webs of the at least one deflector element extend section by section into a partial area of ​​the grooves of the first or second roller, wherein the plate-shaped deflector connects downstream to the webs and connects all webs together, and wherein in particular the plate-shaped deflector and the webs are formed in one piece.

[0025] The plate-shaped deflector is located downstream of the ribs. The ribs are located downstream of the effective area in certain sections. Following the cylindrical surface defined by the blades, the ribs transition into the plate-shaped deflector. The plate-shaped deflector is positioned as close as possible to the cylindrical surface. However, the distance between the cylindrical surface and the plate-shaped deflector is kept small enough to ensure that the associated roller can rotate freely around its axis.

[0026] It is particularly advantageous if the plate-shaped deflector and the ribs are formed in one piece. For example, the deflector element or elements are manufactured from a single piece. The ribs are produced, for example, by machining grooves into a flat component. The deflector element or elements are thus preferably designed as a single piece of material. Furthermore, it is particularly intended that the deflector element or elements are planar, i.e., completely flat. However, it is also intended that one or both deflector elements are curved. For example, the deflector elements, viewed in a cross-section perpendicular to the axial direction, can be curved such that a funnel-shaped opening is formed on both the inlet and outlet sides. Upstream of the effective area, i.e., against the direction of material flow, this funnel widens in the feed area.Downstream of the operating area of ​​the separating device, i.e. in the direction of material flow, the hopper also widens further.

[0027] According to a further embodiment, the first and / or the second plate-shaped deflector upstream of the effective area comprises a further plate-shaped deflector. The plurality of ribs of the first and / or second deflector element thus also extends section by section into a portion of the grooves upstream of the effective area of ​​the separating device and continues upstream into the further plate-shaped deflector. The further plate-shaped deflector connects upstream to the ribs of the deflector element.

[0028] According to a further embodiment, it is provided that the at least one deflecting element is configured to exert a spring force acting in the direction of a separation plane on the flat web or the strips, wherein a shortest connection between a first axis of rotation of the first roller and a second axis of rotation of the second roller is perpendicular to the separation plane, wherein in particular the at least one deflecting element is designed as a spring-elastic element and / or is spring-loaded.

[0029] In other words, the first deflector exerts a spring force towards the second roller or is spring-loaded in this direction. Similarly, the second deflector exerts a spring force towards the first roller or is spring-loaded in this direction. The spring force can be adjustable.

[0030] Furthermore, it is specifically provided that the first and / or the second deflecting element is adjustable in design or mounting, specifically in the direction of the respective opposite roller. The first and / or second deflecting element is thus adjustable. It is positioned up to the opposite roller so that the strips produced from the web material rest between a surface of the deflecting element's ribs and an outer face of the cutting edges. Any variation in the web material thickness is compensated for by the spring action or the resilient mounting of the deflecting element.

[0031] According to a further embodiment, the at least one deflector element, viewed in a plane perpendicular to the axial direction, has at least one S-curve. In particular, the first and / or the second deflector element has a first S-curve in a first direction and a further S-curve in the opposite direction. For example, it is possible to provide an extended inlet area (first S-curve), an area in which the first and second deflector elements have a minimal distance from each other (between the first and second S-curve), and an extended outlet area (second S-curve).

[0032] According to a further embodiment, the device is further developed by including a scraper device comprising a first and / or a second comb-shaped scraper with a plurality of tines, wherein tines of the first scraper engage in the grooves of the first roller to clean the first roller and tines of the second scraper engage in the grooves of the second roller to clean the second roller, wherein the scraper device includes a suction device for suctioning particles removed from the roller(s) by the scrapers.

[0033] The planned particle extraction system is advantageous because any particles remaining in the rollers after the separation process can be removed from the ongoing production process. They can then be reintroduced into the production process elsewhere or disposed of.

[0034] According to a further embodiment, the device is designed such that the at least one deflecting element is mechanically coupled to at least one vibration exciter, which is configured to set the deflecting element into periodic or aperiodic vibration.

[0035] For this purpose, at least one suspension of the deflector element is designed as a vibration exciter. Suitable vibration exciters include, for example, piezoelectric actuators, eccentrics, or ultrasonic generators. It is also possible to use a mechanically rotating element with an imbalance as a vibration exciter. By setting the deflector element into vibration, its wear can be reduced. Furthermore, the strips prevent or eliminate mechanical blockages (clogs) of the rollers.

[0036] According to a further embodiment, the separating device is designed to separate immediately adjacent strips from each other along a predetermined separation line in the working area by stretching the flat web so strongly transversely to the separation line that it tears apart along the separation line.

[0037] In such a device, the first and second rollers are not in direct contact with each other in the working area. The flat web is not cut along the separation line by the interaction of two blades, but rather torn in a controlled manner by overstretching. Because the flat web is not cut but torn in a controlled manner, open structures are created at the fracture edge, i.e., at the side edges of the strips. Due to this open structure, the strips of web material are, for example, better suited to absorbing additives or releasing them, for example, when heated.

[0038] According to a further embodiment, the first and / or the second roller is designed as an intermittent roller, wherein all blades of the intermittent roller each comprise at least one recess that interrupts a cutting edge of the blade, wherein the recesses in the blades of the intermittent roller are arranged along a helix and this helix lies in a cylindrical shell spanned by the cutting edges of the blades and the axis of the helix coincides with an axis of rotation of the intermittent roller.

[0039] In the context of this description, a "recess" is understood to be an intermittent feature or groove that is incorporated into the corresponding blade in such a way that it interrupts the blade's cutting edge. A "helix" is understood to be a helical line with a constant pitch. The recesses arranged along the helix ensure that the cutting device separates the flat web in such a way that the individual strips are connected to each other in adjacent pairs by webs. This prevents the loss of individual strips from the process, even in the event of breakage or strip tearing. The next cross web guides the defective strip back into the process.

[0040] The web material from which the individual strips are made and from which the flat web is made is, for example, reconstituted tobacco material, PLA film, a paper web or another web material.

[0041] The problem is further solved by a device for producing a strand for the tobacco processing industry, comprising a device according to one or more of the aforementioned embodiments, wherein the device further comprises a strand forming unit which is configured to form a strand from the plurality of strips.

[0042] Using such a device, for example, a rod-shaped article for the tobacco processing industry can be manufactured when reconstituted tobacco material is used as the web material. This article could be, for example, a heat-not-burn (HNB) product. If PLA film is used as the web material, the device can be used to manufacture, for example, a cooling element, particularly for an HNB article. If paper is used as the web material, a filter or spacer element can be produced.

[0043] Further features of the invention will become apparent from the description of embodiments according to the invention, together with the claims and the accompanying drawings. Embodiments according to the invention may fulfill individual features or a combination of several features.

[0044] The invention is described below, without limiting the general concept, with reference to exemplary embodiments and the drawings, whereby for all details of the invention not explained in detail in the text, explicit reference is made to the drawings. The drawings show: Fig. 1. A device for producing a strand from web material in a schematically simplified representation, Fig. 2 A schematically simplified detail view of the rollers of a separating device for separating a flat web from a web material, shown in the working area of ​​the two rollers and in a section plane in which the rotation axes of the rollers lie, Fig. 3 A schematically simplified perspective representation of a separating device with a deflecting device and a scraping device with suction, Fig. 4 A schematically simplified perspective detail view of the rollers of a separating device with a deflecting device, shown in the working area of ​​the two rollers, Fig. 5 a schematically simplified top view of a deflector element of the deflector device, Fig. 6 A schematically simplified perspective detail view of a one-piece deflector element in operating position, whereby the opposing roller interacting with the roller is not shown, Fig. 7 A schematically simplified sectional view, in a plane perpendicular to an axial direction, of the two rollers of the separating device including a deflecting device, Fig. 8 a schematically simplified perspective detail view of the rollers of a separating device including a further deflecting device, Fig. 9 a schematically simplified perspective view of one of the two rollers of a separating device with a further deflecting device, Fig. 10 that are from Fig. 9 known roller including the deflector device, shown in a sectional view, in a plane perpendicular to an axial direction, Fig. 11. Another schematic, simplified perspective detail view of the rollers of a separating device with a further deflecting device. Fig. 12 a further schematically simplified sectional view, in a plane perpendicular to the axial direction of the two rollers of the separating device including a further deflecting device and Fig. 13 Another schematically simplified detail view of the rollers of the separating device, shown in the working area of ​​the two rollers and in a section plane in which the rotation axes of the rollers lie, with an additional deflecting device with T-shaped webs in cross-section shown.

[0045] In the drawings, identical or similar elements and / or parts are provided with the same reference numbers, so that a re-presentation is omitted.

[0046] Within the scope of the invention, features marked with "in particular" or "preferably" are to be understood as optional features.

[0047] Fig. Figure 1 shows a schematic and simplified representation of a device 2 for producing a strand 4 from a web material. The web material is unwound as a flat web 6, for example, from a bobbin 8. A spooling unit 10 is provided for this purpose. It is also provided that the flat web 6 can be fed in another way. The web material of the flat web 6 is, for example, reconstituted tobacco material, PLA film, or paper.

[0048] The flat web 6 is fed to a device 11, which is encompassed by the device 2, for separating the flat web 6. The device 11 for separating the flat web 6 comprises a separating device 12 and a deflecting device 13. The separating device 12 is configured to separate the flat web 6 into a plurality of strips 14. The strips 14 extend in a strip plane, which in the illustration of Fig. 1 lies perpendicular to the plane of the paper. The strips 14 are guided out of the separating device 12 by the deflecting device 13. In Fig. Figure 1 shows a schematic top view of the numerous produced strips 14, rotated 90° out of the plane of the paper for clarity. The strips 14, which run essentially parallel to each other, are conveyed, for example, via transport rollers 16 towards an inlet hopper 18 of a strand forming unit 20. Instead of the transport rollers 16, a smooth, flat guide, for example a sheet or the like, can also be provided, over which the strips 14 are pulled and / or pushed. It is further provided that the device 11 differs from the illustration in Figure 1. Fig. 1 is not designed such that the flat web 6 is processed in a horizontal direction. It can be deflected or fed or subjected to one or more processing steps in directions deviating from the horizontal direction. However, it has proven advantageous if the separated strips 14 are no longer deflected until they reach the inlet hopper of the strand forming unit 20. The strand forming unit 20 is part of the device 2 for producing the strand 4. In it, a strand 4 is formed from the multitude of strips 14. The strand formation takes place, for example, in a format channel 22, which is only shown schematically. After strand formation, the strand 4 can be cut into individual rod-shaped articles 24 of a desired length.

[0049] The separating device 12 of the device 11 for separating the flat web 6 comprises a first roller 26 and a second roller 28 that interacts with it. The two rollers 26, 28 are not in mechanical contact with each other. The first roller 26 rotates about a first axis of rotation 27, the second roller 28 rotates about a second axis of rotation 29.

[0050] Fig. Figure 2 shows a schematically simplified detail view of the two rollers 26, 28 of the separating device 12 in the working area of ​​the two rollers 26, 28. Fig. Figure 2 is a representation in a section plane in which the axes of rotation 27, 29 of the rollers 26, 28 lie. The axes of rotation 27, 29 of the rollers 26, 28 extend in the axial direction A.

[0051] The first roller 26 has a first surface 30 and the second roller 28 has a second surface 32. The surfaces 30, 32 of the rollers 26, 28 have alternating circumferential grooves 34 and blades 36 in the axial direction A. For clarity, only some of the grooves 34 and the blades 36 are labelled. In the depicted working area of ​​the two rollers 26, 28, the blades 36 of the first roller 26 engage in the grooves 34 of the second roller 28, and the blades 36 of the second roller 28 engage in the grooves 34 of the first roller 26. When the flat web 6 is introduced into the working area between the two rollers 26, 28, it is locally and transversely overstretched along a parting plane T, which is shown as a dotted line, to such an extent that the flat web 6 tears apart in this parting plane T. The parting plane T lies in the diagram of Fig. 2 perpendicular to the track plane E, in which the flat track 6 is fed to the separating device 12.

[0052] The blades 36 of the rollers 26, 28 each comprise a top surface 38, which is part of the lateral surface 30, 32 of the associated roller 26, 28. The grooves 34 each comprise a bottom surface 40, which is also part of the lateral surface 30, 32 of the associated roller 26, 28. The blades 36 and the grooves 34, more precisely the top surface 38 of the blade 36 and the bottom surface 40 of the adjacent groove 34, are each connected to one another by flanks 42, 44. Depending on whether the grooves 34 or the blades 36 are associated with the first or the second roller 26, 28, these flanks shall be designated as first flanks 42 if they are the first roller 26, and as second flanks 44 if they are the second roller 28. The flanks 42, 44 extend radially, i.e., in a radial direction R which is perpendicular to the axial direction A. The radial direction R runs in the direction of a radius of the respective roller 26, 28.The dividing lines, along which the flat web 6 is divided into strips 14, run between the first flanks 42 of the first roller 26 and the second flanks 44 of the second roller 28.

[0053] The separating device 12 is designed to separate the flat web 6, which has a predetermined material thickness. The separating device 12 can be configured such that an axial gap 46 is provided between the flanks 42, 44 of opposing rollers 26, 28, i.e., between the first flank 42 and the second flank 44. This gap is 0.5 to 2 times, in particular 0.6 to 1 time, of the predetermined material thickness of the flat web 6. For example, a distance D measured in the radial direction R of the rollers 26, 28 between the top surface 38 of the blades 36 of the first roller 26 and the top surface 38 of the blades 36 of the second roller 28 is 1 to 5 times the predetermined material thickness of the flat web 6.The local overstretching of the flat web 6 along the dividing lines results in the individual strips 14, of which only some are labelled for clarity, being separated from one another in the grooves 34 of the rollers 26, 28. The strips 14 have an open structure at their edges 48, as they are not separated by a cut, but rather torn apart by overstretching.

[0054] As a result of the separation of the flat web 6 into individual strips 14, it can happen that individual strips 14 adhere to the bottom of the grooves, i.e., on or near the bottom 40 of the grooves 34 in the respective rollers 26, 28, and are thus difficult to remove from the grooves 34 at the end of the working area between the two rollers 26, 28. For this reason, the separating device 12 includes the deflecting device 13, which comprises at least one deflecting element whose ribs 50 engage in the grooves 34 of the first and second rollers 26, 28. The ribs 50 extend between the bottom 40 of the grooves 34 and the respective strip 14. The strips 14 are guided out of the grooves 34 at the end of the working area by the ribs 50, i.e., guided from the bottom 40 of the grooves 34 towards the top 38 of the blades 36. From there, the strips 14 are led out of a cylindrical surface of the rollers 26, 28 defined by the outer circumferences of the blades 36.The strips 14 then pass onto a plate-shaped deflector of the deflector element, which is arranged downstream of the effective area and is designed as a closed surface.

[0055] Fig. Figure 3 shows a schematically simplified perspective view of the cutting device 12, comprising the first roller 26 and the second roller 28. For clarity, the flat web 6 and the strips 14 produced from it by the cutting device 12 are not shown. The flat web 6 is fed to the cutting device 12 from the right side via an inlet area 60. In an operating area 52, the rollers 26 and 28 engage, and the flat web 6 is cut into individual strips 14. The deflector device 13 comprises a first deflector element 54 and a second deflector element 56. The deflector elements 54 and 56 are designed as plate-shaped deflectors in sections.

[0056] At the in Fig. In the embodiment shown in section 3, the deflecting elements 54, 56 are arranged symmetrically to a separation plane AT. Their position is shown in Fig. 3 indicated by a dotted line. The deflecting elements 54, 56 are furthermore designed symmetrically to the separation plane AT in both the inlet area 60 and the outlet area 58, i.e., upstream and downstream of the effective area 52. In other words, the deflecting elements 54, 56 are designed identically in the inlet area 60 and in the outlet area 58.

[0057] In Fig. Figure 3 shows the area of ​​the second deflector element 56, designed as a plate-shaped deflector 62, visible in the outlet area 58. This plate-shaped deflector 62 is designed as a closed surface and connects the Fig. 3 non-visible webs 50 of the second deflecting element 56 are connected to each other.

[0058] The deflecting elements 54, 56 are, for example, designed to exert a spring force acting in the direction of a separation plane AT on the flat track 6 or the manufactured strips 14. For this purpose, the deflecting elements 54, 56 are designed, for example, as spring-elastic elements.

[0059] It is also provided that the bearings or suspensions 63 of the deflector elements 54, 56 are designed as spring bearings. The first deflector element 54 thus exerts a spring force in the direction of the second roller 28 or is spring-loaded in this direction. Similarly, the second deflector element 56 exerts a spring force in the direction of the first roller 26 or is spring-loaded in this direction. The spring force can be adjustable in each case.

[0060] According to a further embodiment, the deflecting elements 54, 56 are mechanically coupled to at least one vibration exciter. This exciter is configured to set the deflecting element 54, 56 into periodic or aperiodic vibration. For example, at least one suspension 63 of at least one deflecting element 54, 56 is designed as a vibration exciter, for example as a piezoelectric actuator, eccentric, ultrasonic generator, or as a mechanically rotating element with an imbalance. By setting the deflecting element 54, 56 into vibration, mechanical blockages (clogs) of the rollers 26, 28 by the strips 14 are prevented or eliminated.

[0061] The separating device 12 is further equipped with a scraper device 64. This comprises a first comb-shaped scraper 66, which is provided with a plurality of tines, wherein the tines of the first scraper 66 engage in the grooves 34 of the first roller 26 and serve to clean the first roller 26. The scraper device 64 further comprises a second scraper 68, which is also provided with tines, wherein the tines of the second scraper 68 engage in the grooves 34 of the second roller 28 to clean it. The scraper device 64 further comprises a suction device 70 with which the particles removed from the rollers 26, 28 by the scrapers 66, 68 are suctioned away. In the Fig. In the device shown in Figure 3, the extraction device 70 comprises a hood 72 in which an extraction channel 74 is provided. The hood 72 extends to a lateral surface of the rollers 26, 28, so that particles removed by the scrapers 66, 68 are taken into the interior of the hood 72 and removed via the extraction channel 74.

[0062] The first cutting roller 26 or the second cutting roller 28, or both cutting rollers 26, 28, i.e., the first cutting roller 26 and the second cutting roller 28, are, for example, designed as intermittent roller(s). The design of the cutting device 12 with at least one intermittent roller ensures that the strips 14 are connected to each other in pairs by transverse webs. In an intermittent roller, all blades 36 of the intermittent roller 26, 28 are each provided with a recess that interrupts one cutting edge of the blade 36. The recesses in the blades 36 of such an intermittent roller 26, 28 are arranged along a helix. This helix lies within a cylindrical shell spanned by the cutting edges of the blades 36. The axis of this helix coincides with the respective axis of rotation 27, 29 of the intermittent roller 26, 28.

[0063] The deflector 13 has a heating device 150 for heating the deflector 13, in particular for heating the webs. Preferably, as shown, the heating device 150 is designed as a heating cartridge and arranged on the plate-shaped deflector 62. The heating device is connected to a control unit to control and / or regulate the temperature of the heating element and the deflector. A sensor is provided for regulating the temperature (in Fig. 3 not shown), for example, an infrared sensor that detects the temperature of the deflector device at a measuring point. In Fig. Figure 3 shows only one heating element, 150. The deflectors, for example, show (in Fig. (3 not shown) two heating elements 150, 151, as for example in Fig. 6 shown, or for example four heating elements 150, 151, 152, 153, as for example in Fig. 7 shown. In the Fig. Heating devices and / or heating elements and / or heating plates are preferably present in positions 1 to 13, for example one, two, three or four.

[0064] Fig. Figure 4 shows a schematically simplified perspective detail view of the first roller 26 and the second roller 28. An outer blade 36 of the first roller 26 is visible in the foreground. In the working area 52, this blade 36 overlaps with a blade 36 of the second roller 28. The blade 36 thus engages in a groove 34 of the opposite roller 26, 28. The web 50 of the second deflector 56 extends through this groove 34. An opposing first deflector 54 also has webs 50, of which only one is partially visible. These extend through the grooves 34 of the first roller 26. The flat web 6 is fed into the working area 52 from the right side between the first deflector 54 and the second deflector 56.In the working area 52, the flat web 6 is separated into individual strips 14. These strips are guided out of the rollers 26, 28 on the upper side 76 of the webs 50 facing the respective opposite rollers 26, 28. The strips 14 then reach the plate-shaped deflector 62, which is in . Fig. The strips 14 are marked with a reference numeral for the second deflector 56. They are guided on the top side of the deflector 62 and made available for further processing steps. In the same manner as described for the second deflector 56, the strips 14 are also guided out of the first roller 26 by the first deflector 54. In the discharge area 58, the strips 14 are guided between the two deflectors 54 and 56, more precisely between the plate-shaped deflectors 62 of the respective deflector elements 54 and 56.

[0065] Fig. Figure 5 shows a schematic and simplified top view of a deflector element, specifically the first deflector element 54 of the deflector device 13. The deflector element 54 comprises a plurality of webs 50. Between the webs 50 are spaces or slots through which the blades 36 of the first roller 26 project in the ready-to-use assembly state. The webs 50 transition into the plate-shaped deflector 62. An extension 78 of the plate-shaped deflector 62 in axial direction A is greater than a dimension of the effective area 52 in this direction. The dimension of the effective area 52 in axial direction A corresponds to the distance between the outermost blades 36 of the rollers 26, 28. Since the blades 36 of the roller 26 project through the slots between the webs 50, this is therefore the distance between the outer edges of the outermost slots, measured in axial direction A.

[0066] The deflector element 54, for example, is manufactured in one piece. For this purpose, a plate is provided with slots, so that the webs 50 are formed. The deflector element 54 is therefore, for example, completely flat.

[0067] Fig. Figure 6 shows a schematically simplified perspective detail view of a one-piece deflector element 54 in its operating position. The opposing roller 28, which interacts with the depicted roller 26, is not shown. The deflector element shown is intended to be, for illustrative purposes only, the first deflector element 54. The blades 36 of the first roller 26 extend in the grooves between the webs 50. The webs 50 transition into the plate-shaped deflector 62. The plate-shaped deflector 62 connects to the webs 50 downstream and links all of them together. Upstream, in the illustrated embodiment, the webs 50 are also connected to each other by another plate-shaped deflector 80.

[0068] Fig. Figure 7 shows a schematically simplified sectional view, lying in a plane perpendicular to the axial direction A, of the first roller 26 and the second roller 28. Also shown are the first deflector element 54 and the second deflector element 56, which together form the deflector device 13. The two deflector elements 54 and 56 are arranged on opposite sides of the separation plane AT. The separation plane AT is arranged such that it is perpendicular to the shortest path between a first axis of rotation 27 of the first roller 26 and a second axis of rotation 29 of the second roller 28. The separation plane AT bisects this shortest path exactly in the middle. The separation plane AT is therefore equidistant from the first and second axes of rotation 27 and 29. This is valid under the assumption that the two rollers 26 and 28 have equal radii. The two deflector elements 54 and 56 are arranged symmetrically to the separation plane AT as an example.

[0069] Fig. Figure 8 shows, in a schematically simplified perspective detail view, the first roller 26 and the second roller 28, with the second roller 28 being exemplary, designed with a second deflecting element 56 according to a further embodiment. The webs 50 are on the surface shown in the Fig. The front side of the roller is received in a common holder 82. In particular, it is provided that the webs 50 are not formed integrally with this holder 82. Furthermore, each web 50 has an S-shaped cut, so that its upper surface 76 reduces the distance to the opposite roller, in this case the first roller 26, in certain areas. The S-shaped cut is directed towards this first roller 26.

[0070] Fig. Figure 9 shows a further schematically simplified perspective view, in which the second roller 28 and a second deflecting element 56 are shown according to a further embodiment. The deflecting element 56 has a first S-shaped cut in a first region 84 and a second S-shaped cut in a second region 86.

[0071] Fig. 10 shows the from Fig. 9 known roller 28 including the second deflecting element 56 in a sectional view, shown in a plane perpendicular to the axial direction A. Visible again are the first and the second areas, 84, 86, in which the S-shaped cuts in opposite directions are present in the deflecting element 56.

[0072] Fig. Figure 11 shows, in a further schematic and simplified perspective view, the rollers 26, 28 of the separating device 13, each with a deflecting element 54, 56 according to a further embodiment. The deflecting elements 54, 56 are designed such that they each have two S-shaped curves directed in opposite directions.

[0073] These are located in the first and second areas 84, 86. Additionally, a recess is present in a third area 88 in which the deflector 54, 56 moves away again from the respective opposite roller 26, 28.

[0074] Fig. Figure 12 shows a further schematically simplified sectional view in a plane perpendicular to the axial direction A of the two rollers 26, 28 of the separating device 12. The separating device 12 shown comprises a deflector device 13, comprising a first deflector element 54 and a second deflector element 56. In contrast to the deflector devices 13 described in the preceding embodiments, the webs 50 of the Fig. The deflecting elements 54 and 56 shown in Figure 12 are each held on one side by the plate-shaped deflector 62 and extend from it into the grooves 34 of the first roller 26 and into the grooves 34 of the second roller 28, respectively. A web 50 of the first deflecting element 54 is fully visible, as the sectional view in Fig. Figure 12 reveals a groove 34 of the first roller 26. Starting from the deflector 62, this web 50 extends into the groove 34 towards its free end 90. The web 50 of the second deflector element 56 is only partially visible, as the corresponding groove of the second roller 28 is not shown in the sectional view of Fig. 12 is not shown.

[0075] The discharge zone between the deflecting elements 54, 56 widens in a funnel shape. The plate-shaped deflector 62 of the second deflecting element 56 is designed to be flat and, for example, parallel to the parting line AT indicated by the dotted line. This allows the individual strips (not shown) to be guided out of the effective area between the rollers 26, 28 via the webs 50 and the plate-shaped deflector 62 of the second deflecting element 56.

[0076] Furthermore, an example of a first scraper 66 of a previously described scraper device 64 is shown in Fig. 12 is shown on the first roller 26.

[0077] Fig. Figure 13 shows a further schematically simplified detail view of the rollers 26, 28 of the separating device 12. The depiction shows an operating area between the two rollers 26, 28 in a cross-sectional plane in which the axes of rotation of the rollers 26, 28 lie. The representation is similar to that in Fig. 2. The first roller 26 and the second roller 28 are shown only in sections. The blades 36 of the first roller 26 engage in grooves 34 of the second roller 28. Conversely, the blades 36 of the second roller 28 engage in the grooves 34 of the first roller 26. The webs 50 of the first deflector element 54 are arranged in the grooves 34 of the first roller 26 and in the grooves 34 of the second roller 28, also shown in cross-section. The webs 50 of the second deflector element 56 are arranged in the grooves 34 of the second roller 28 and are shown in cross-section. The webs 50 have a T-shaped cross-section. A flat upper surface 92 of the webs 50 faces the parting line AT. On this flat upper surface 92, the Fig. The strips 14 (not shown) are led out of the working area between the first and second rollers 26, 28. The webs 50 only fill the grooves 34 approximately in width in a head area 94. In a significantly narrower body area 96, the width of the webs 50 is considerably less. This makes it possible for contaminants to be transported between the groove flanks 98 and the narrow body area 96 towards the bottom 40 of the grooves 34, where they are removed by means of the Fig. 13. The not shown scraper device 64 can be removed.

[0078] All features mentioned, including those discernible from the drawings alone as well as individual features disclosed in combination with other features, are considered essential to the invention, both individually and in combination. Inventive embodiments may be fulfilled by individual features or by a combination of several features. Reference symbol list 2 Device for producing a strand 4 strand 6 flat track 8 Bobbins 10 spooling units 11 Device for separating a flat track 12 Separating device 13 Deflector device 14 strips 16 transport rollers 18 inlet funnels 20 strand forming units 22 format channels 24 items 26 first roller 27 first axis of rotation 28 second roller 29 second axis of rotation 30 first lateral surface 32 second lateral surface 34 grooves 36 blades 38 Top 40 floor 42 first flank 44 second flank 46 axial gap dimension 48 edges 50 bridges 52 Area of ​​influence 54 first deflector element 56 second deflector element 58 Outlet area 60 Inlet area 62 plate-shaped deflectors 63 Suspension 64 Scraper device 66 first scraper 68 second wiper 70 Extraction device 72 Hood 74 Extraction channel 76 Top 78 Extent 80 more deflectors 82 bracket 84 first area 86 second area 88 third area 90 free ending 92 flat top 94 Head area 96 Hull area 98 groove flanks 150 to 153 Heating device A Axial direction AT separation level E Paper level R radial direction T Separation plane

Claims

[1] Device (11) for separating a flat web (6) made of a web material into a plurality of strips (14), comprising a separating device (12) and a deflecting device (13), wherein the separating device (12) comprises a first and a second roller (26, 28) cooperating with it, and wherein the outer surfaces (30, 32) of the rollers (26, 28) have alternately closed circumferential grooves (34) and blades (36) in the axial direction (A) of the respective roller (26, 28), and in an effective area the blades (36) of the first roller (26) engage in the grooves (34) of the second roller (28) and the blades (36) of the second roller (28) engage in the grooves (34) of the first roller (26), and the separating device (12) is configured to separate the flat web (6) into a plurality of adjacent strips (14) to separate, wherein the deflecting device (13) comprises at least one deflecting element (54, 56) whose webs (50) engage in the grooves (34) of the first or the second roller (26, 28),in particular, laterally spaced on both sides, engage, wherein the at least one deflecting element (54, 56) is sectionally designed as a plate-shaped deflector (62) which forms a closed surface downstream and / or upstream of the effective area of ​​the separating device (12) and extends in the axial direction (A) over at least two webs (50), characterized by , that the deflector device (13) has a heating device (150, 151, 152, 153), preferably with one, two, three or four heating elements or heating plates, which are preferably arranged on the plate-shaped deflector. [2] Device (11) according to claim 1, characterized by , that the webs (50) of the at least one deflecting element (54, 56) of the deflecting device (13) are held on one side of the plate-shaped deflector (62) and extend from the deflector (62) in the direction of their respective free ends (90) into the grooves (34) of the first roller (26) or the second roller (28). [3] Device (11) according to claim 1 or 2, characterized by , that at least one web (50), in particular all webs (50), of the at least one deflecting element (54, 56) have a T-shaped cross-section. [4] Device (11) according to any one of claims 1 to 3, characterized by , that the deflecting device (13) comprises a first and a second deflecting element (54, 56) arranged on opposite sides of a separation plane (AT), wherein a shortest connection between a first axis of rotation (27) of the first roller (26) and a second axis of rotation (29) of the second roller (28) is perpendicular to the separation plane (AT), wherein the two deflecting elements (54, 56) are arranged on both sides of the separation plane (AT), in particular in a mirror-symmetrical manner with respect to the separation plane (AT). [5] Device (11) according to any one of claims 1 to 4, characterized by, that the at least one deflecting element (54, 56) is configured to exert a spring force acting in the direction of a separation plane (AT) on the flat web (6) or the strips (14), wherein a shortest connection between a first axis of rotation (27) of the first roller (26) and a second axis of rotation (29) of the second roller (28) is perpendicular to the separation plane (AT), wherein in particular the at least one deflecting element (54, 56) is designed as a spring-elastic element and / or is spring-loaded. [6] Device (11) according to any one of claims 1 to 5, characterized by , that at least one deflecting element (54, 56), considered in a plane perpendicular to the axial direction (A), has at least one S-curve. [7] Device (11) according to any one of claims 1 to 6, characterized by, furthermore, a scraper device (64) is included, which comprises a first and / or a second comb-shaped scraper (66, 68) with a plurality of tines, wherein tines of the first scraper (66) engage in the grooves (34) of the first roller (26) for cleaning the first roller (26) and tines of the second scraper (68) engage in the grooves (34) of the second roller (28) for cleaning the second roller (28), wherein the scraper device (64) comprises a suction device (70) for suctioning particles removed from the roller(s) (26, 28) by the scrapers (66, 68). [8] Device (11) according to any one of claims 1 to 7, characterized by , that at least one deflecting element (54, 56) is mechanically coupled to at least one vibration exciter which is designed to set the deflecting element (54, 56) into periodic or aperiodic vibration. [9] Device (11) according to any one of claims 1 to 8, characterized by, that the separating device (12) is configured to separate immediately adjacent strips (14) from each other along a predetermined separation line (T) in the working area (52) by stretching the flat sheet (6) transversely to the separation line (T) so much that it tears apart along the separation line (T). [10] Device (11) according to any one of claims 1 to 9, characterized by , that the first and / or the second roller (26, 28) are designed as an intermittent roller, wherein all blades (36) of the intermittent roller each comprise at least one recess that interrupts a cutting edge of the blade (36), wherein the recesses in the blades (36) of the intermittent roller (26, 28) are arranged along a helix and this helix lies in a cylindrical shell spanned by the cutting edges of the blades (36) and the axis of the helix coincides with an axis of rotation (27, 29) of the intermittent roller (26, 28). [11] Device (11) according to any one of claims 1 to 10, characterized by , that the heating device (150, 151, 152, 153) is designed and configured to heat the deflectors to a predetermined temperature, preferably between 40°C and 60°C, particularly preferably to 50°C or 55°C. [12] Device (11) according to any one of claims 1 to 11, characterized by that the device includes a sensor for detecting the temperature at a measuring point of the deflectors and in particular has a control unit which is designed and configured to carry out temperature control on the basis of the temperature detected by the sensor at the measuring point. [13] Device (11) according to any one of claims 1 to 12, characterized by , that the webs of the deflector element have a lower coefficient of expansion than the grooves of the first and / or second roller. [14] Device (2) for producing a strand (4) for the tobacco processing industry, comprising a device (11) according to any one of claims 1 to 13 and a strand forming unit (20) which is configured to form a strand (4) from the plurality of strips (14).

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