GARMENT CARRIER FOR A CARDING ELEMENT OF A SPINNING MACHINE; CARDING ELEMENT AND SPINNING MACHINE

Description

[0001] The invention relates to a yarn strip for a carding element of a spinning machine, such as a carding machine. Furthermore, the invention relates to a carding element of such a spinning machine, such as a carding machine, comprising such a yarn strip and a spinning machine with such a carding element.

[0002] In practice, flexible carding elements are predominantly used for carding machines. These elements comprise carding strips—also called carding bars—made of elastic, multi-layered fabric and embedded hooks, also called carding points or teeth. These hooks are bent from round or oval wire and equipped with a bend (an angled section) to flex under load and return to their original position when unloaded. The carding strips can be designed as a continuous narrow or wide band. The teeth are inserted and anchored in the carding strips.

[0003] However, tooth strips are also known that are made from a large number of strip-shaped, stamped tooth segments arranged in a row. When using stamped tooth segments, the problem lies in aligning all the individual tooth segments with tight tolerances in one plane. This is often not possible, so the tooth segments have to be ground flat at their tips. This, however, significantly increases the manufacturing effort and costs.

[0004] In CH 654 341 A5, the individual tooth segments, stacked one behind the other, are joined by a material bond, e.g., by soldering or welding at their tooth base, to form packages. Identical, angled slots are arranged at both axial ends of the individual tooth segments. Clamps can engage in these slots. These clamps connect the material-bonded packages of tooth segments to the cover bar, so that the tooth base of the tooth segments rests directly on the cover bar. However, a problem with soldering or welding the tooth segments into packages is the distortion caused by the heat input: individual tooth segments can warp relative to their neighbors, necessitating re-grinding of the teeth at the tooth head or of the soldered or welded joints at the tooth base to guarantee a precise fit against the cover bar.

[0005] In DE 10 2013 104 480 A1, the individual, loosely arranged tooth segments are joined to a backplate by laser welding and mounted to the cover rod by means of magnetic fastening. Here, too, the heat from the welding causes distortion, so that the assembled tooth segments must be ground down again.

[0006] EP 0253071 A2 provides for the fastening of the tooth segments by means of a spring element that engages in the tooth base from the inside or outside.

[0007] In the CN 212925262 U, the tooth segments are held securely in place by a dovetail-shaped mounting device. This mounting device is a solid aluminum support body that is also inserted into the carding element and clamped from above using screws.

[0008] In EP 0091986 A1, the tooth segments have a cavity at the base into which a support is inserted. Alternatively, the tooth segments can be inserted into a support body. The assembled tooth segments are fastened to the cover rod or carding element by means of externally arranged springs.

[0009] Based on this, there is still a need to optimize the manufacturing process for a set strip. In particular, the need for reworking the set strip to bring all the teeth to the same height should be eliminated.

[0010] The object of the invention is therefore to provide a carding strip for a carding element of a spinning machine, such as a carding machine, such a carding element, and such a spinning machine, which are improved compared to the prior art and, in particular, involve comparatively lower manufacturing effort and costs. The carding element can be designed as a fixed carding element or as a cover bar.

[0011] The problem underlying the invention is solved by a garment strip for a carding element of a spinning machine, such as a carding machine, such a carding element, and such a spinning machine according to the independent claims. Preferred embodiments of the invention are specified in the dependent claims, which can be selectively combined with one another.

[0012] A garment strip according to the invention for a carding element of a spinning machine, such as a carding machine, comprises a carrier plate and a plurality of tooth segments, each with a tooth head having a plurality of teeth and a tooth base opposite the tooth head, wherein the tooth segments are arranged one behind the other in the longitudinal extension of the carrier plate, wherein they each support themselves with the tooth base on the carrier plate and the tooth segments are held on the carrier plate by means of a positive locking connection.

[0013] When it is stated that the tooth segments are arranged one behind the other along the longitudinal axis of the carrier plate, this means that they are arranged parallel to each other. Parallel to each other means that the longitudinal axes of the respective tooth segments arranged one behind the other run parallel to each other. The tooth segments are arranged on the carrier plate in such a way that the longitudinal axes of the tooth segments run perpendicular to the longitudinal axis of the carrier plate.

[0014] The positive-locking connection involves the tooth segments and the carrier plate interlocking directly or indirectly via another connecting element, such as a clamp. This prevents the carrier plate and the tooth segments from separating, even without or with interrupted force transmission. In other words, with a positive-locking connection, one connecting element obstructs the other.

[0015] Preferably, the carrier plate and the tooth segments can (together) form the positive-locking connection. In this case, no additional connecting element, such as a clamp, is required. This reduces the number of parts, as well as the manufacturing and assembly effort.

[0016] The tooth segments can be designed in strip form and are preferably loosely arranged one after the other. "Loose" in this context means that they are free from any connection, such as a material bond, between them. By means of the positive-locking connection, the loosely connected tooth segments can be grouped together into a package and are secured against falling out of the carrier sheet. This latter feature ensures that the tooth segments lie in the same plane and therefore do not require any further grinding after the positive-locking connection with the carrier sheet has been established.

[0017] The support plate can preferably completely surround the tooth root of each tooth segment. This ensures that each tooth root has a sufficiently large contact surface on the support plate.

[0018] The positive-locking connection is formed by at least one axial end of the tooth segments and a corresponding edge region of the support plate. This is achieved by the edge region of the support plate encompassing at least one axial end of each tooth segment, in particular by bending the edge region of the support plate. In other words, it is the longitudinal edges of the support plate that form the positive-locking connection with the at least one axial end of all tooth segments, thus positively engaging all tooth segments at their at least one axial end.

[0019] The support plate has a C-shaped cross-section, comprising a long leg on which the root of each individual tooth segment rests, and short legs extending from the long leg on both sides. These short legs each engage the two axial ends of the tooth segments to create a positive-locking connection. The short legs are formed by the edge region of the longitudinal edges of the support plate. The two axial ends of the tooth segments can be chamfered so that they form a dovetail joint with the support plate. This allows for a cost-effective and structurally simple positive-locking connection between the tooth segments and the support plate. The short legs of the C-shaped cross-section press the tooth segments toward the long leg.This ensures that the root of each tooth segment sits flush against the carrier plate. Assuming the carrier plate is flat, all teeth of the tooth segments lie on the same plane. This eliminates the need for post-processing, such as grinding the teeth.

[0020] Alternatively, the tooth segments can have a recess, such as a slot, at both axial ends to accommodate an edge section of the carrier plate. This also allows for a positive-locking connection between the carrier plate and the tooth segments.

[0021] The tooth segments can be made from a sheet, preferably of corrosion-protected material, and preferably by cutting, such as punching or laser cutting. The carrier sheet can be made from a sheet, preferably of a corrosion-protected, ferromagnetic, electrically conductive material, such as tinplate. The ferromagnetic property allows the carrier sheet to be attracted by a magnet and held in the cover bar. The electrically conductive property ensures that a short-circuit current is detected for collision detection between the tooth strip and, for example, a tooth set on a drum of the carding machine. This reliably prevents a collision between the two if they come closer due to thermal expansion occurring during carding machine operation.

[0022] The invention also relates to a carding element of a spinning machine, such as a carding machine, comprising a yarn strip according to the invention. The yarn strip can be received in a recess of the carding element. The carding element can be designed as a fixed carding element or a cover bar. Furthermore, the recess can have a magnet to attract the yarn strip to the magnet via the carrier plate and hold it therein. The carding element can also have a groove in the area of ​​the recess into which a complementary spring of the carrier plate engages, the spring being formed integrally with the carrier plate, in particular by folding. In this way, a carding element can be provided in which the yarn strip according to the invention can be replaced with minimal effort.

[0023] Furthermore, the invention relates to a spinning machine, such as a carding machine, comprising a carding element according to the invention.

[0024] Further measures improving the invention are described in more detail below together with a description of a preferred embodiment of the invention with reference to the figures.

[0025] They show: Fig. 1 a schematic side view of a spinning machine designed as a carding machine; Fig. 2 cover bars of a traveling cover in a detail view from Fig. 1 ; Fig. 3a a side view of a non-inventive embodiment of a trim strip; Fig. 3b a cross-section through the object made of Fig. 3a ; Fig. 4a a side view of an embodiment of a trim strip according to the invention; Fig. 4b the assembly of the trim strip according to Fig. 4a in a lid rod.

[0026] Fig. 1 Figure 4 shows a highly schematic and therefore not-to-scale side view of a spinning machine designed as a carding machine, with feed roller 1, feed table 2, pre-tearers 3a, 3b, 3c, drum 4, take-off roller 5, stripping roller 6, squeeze rollers 7, 8, web guide element 9, feed hopper 10, take-off rollers 11, 12, traveling cover 13 with cover deflection rollers 13a, 13b and cover bars 14, can 18 and can holder 19. The drum 4 interacts with fixed carding elements, suction elements and reject knives (not otherwise specified). The directions of rotation of the rollers are shown with curved arrows. M denotes the center point (longitudinal axis) of the drum 4. 4a indicates the drum assembly and 4b indicates the direction of rotation of the drum 4. Arrow A denotes the working direction. Arrow B indicates the direction of travel of the cover bars 14 in carding position, and arrow C indicates the return transport of the cover bars 14. The curved arrows drawn in the rollers indicate the directions of rotation of the rollers.

[0027] Fig. 2 shows a detailed view of the subject Fig. 1 , in particular the traveling cover 13. The cover rods 14 each have a cover head at both ends. Support bodies 15 are attached to the cover heads. The cover assembly 16 is attached to the underside of the support body 15. The point circle of the narrowest point of each cover assembly 16 is designated by 21. The drum 4 has the drum assembly 4a, e.g., a sawtooth assembly, on its circumference. The point circle of the drum assembly 4a is designated by 22. The distance between the point circle 21 and the point circle 22 is designated by a and is, for example, 0.20 mm. The distance between the convex outer surface 20a and the point circle 22 is designated by b. The radius of the convex outer surface 20a is designated by r1, and the radius of the point circle 22 is designated by r2. The radii r1 and r2 intersect at the center point M (see Fig. 1 ) the drum 4.

[0028] In Fig. 3a Figure 1 shows a side view of an embodiment of a trim strip 23, which serves as a cover trim 16 of a cover rod in the Fig. 1 und 2 This could be used in an application. Such a trim strip 23 is made from a multitude of tooth segments 24 arranged one behind the other. The tooth segments 24 could be produced in strip form, i.e., from a sheet of metal, e.g., by cutting, such as punching or laser cutting.

[0029] Each tooth segment 24 comprises a tooth head 24.2 and a tooth base 24.1. The tooth heads 24.2 of the tooth segments 24 comprise teeth 24.3 and are directed against the direction of rotation of the drum (not shown), i.e., against the fibers to be combed. In this case, the tooth segments 24 are arranged such that the teeth 24.3 of adjacent, i.e., successive, tooth segments are offset from one another, here along their longitudinal axis. The offset of the teeth 24.3 can be repeated over the entire length of the trim strip 24 or cover bar 14.

[0030] Such a set strip 23 shown thus initially comprises a large number of loosely connected tooth segments 24. The connected tooth segments 24 are best made of Fig. 3b evident which form a cross-section through the object of Fig. 3a shows.

[0031] To make it easier to insert the tooth segments 24 into the cover rod 14 and prevent them from falling out, they are held together by a support plate 25. The tooth segments 24 each rest on the support plate 25 with their tooth base 24.1.

[0032] Additionally, they are, as in Fig. 3a As indicated, the tooth segments 24 are held in place on the carrier plate 25 by means of a positive-locking connection. As shown, the carrier plate 25 and the tooth segments 24 can form this positive-locking connection: The positive-locking connection is formed here by both axial ends of the tooth segments 24 and a corresponding edge region of the carrier plate 25. For this purpose, the carrier plate has a C-shaped cross-section. It comprises a long leg 25.1, on which the tooth root 24.1 of each individual tooth segment 24 rests, and short legs 25.2 adjoining the long leg 25.1 on both sides, each of which engages the two axial ends of the (here: all) tooth segments 24 to establish the positive-locking connection. For this purpose, the two axial ends of the (all) tooth segments 24 are chamfered in such a way that they form a dovetail joint together with the carrier plate that engages them.

[0033] The object from Fig. 3a und 3b This can be produced by placing the multitude of consecutively arranged tooth segments 24 onto a carrier plate, initially U-shaped or C-shaped, comprising the long leg 25.1 and the two short legs 25.2, which are initially positioned perpendicular to the long leg 25.1. The U-shaped or C-shaped carrier plate is designed as a cassette into which the tooth segments 24 are inserted or slid. This is done by placing each tooth root 24.1 of the corresponding tooth segment 24 onto the long leg 25.1. Subsequently, the short legs 25.2 – i.e., the edge regions, here the longitudinal sides of the carrier plate 25 – are bent on both sides towards the chamfered axial ends of the tooth segments 24. This is achieved by forming, for example, by a pressing or rolling process, in which the upright short legs 25.2 are pressed against or into the tooth segments 24.This creates a positive connection between the carrier plate 25 and the tooth segments 24, which press the tooth feet 24.1 onto the carrier plate 25 and connect the loose tooth segments 24 to each other to form a package.

[0034] Although not shown, it is conceivable that the axial ends of the tooth segments 24 could have a recess, such as a slot, instead of a chamfer, into which the edge region of the carrier plate 25 could then engage in a form-fitting manner by bending or rolling over the short leg 25.2 of the carrier plate 25. As in the following embodiments, a spring 26 can be arranged on one side here, which not only facilitates the assembly of the trim strip 23 into the cover rod 14, but also improves the magnetic connection, since the spring 26 prevents it from suddenly tipping out of the cover rod 14. A further advantage of the spring 26 lies in the error-free assembly of the trims, which prevents incorrect alignment of the teeth.

[0035] In Fig. 4a is another embodiment, as a modification of the subject matter of the Fig. 3a shown. It can be seen that a spring 26 is provided here on one side, i.e. at an axial end of the trim strip 23, which is produced here by folding from the carrier sheet 25, preferably from the short leg 25.2 itself.

[0036] The assembly of the trim strip from the Fig. 4a is in Fig. 4b shown. The exemplary cover rod 14 includes a recess 27 between two opposing webs 27.1, 27.2. The trim strip can also be inserted into this recess 27. Fig. 3a can be used. Instead of the lid rod, the set can also be inserted into a fixed carding element.

[0037] In addition to exemption 27, according to the Fig. 4b A groove 29 is provided on one side, which can be incorporated into the web 27.1. It serves to support the spring 26 of the trim strip 23. Fig. 4a to record.

[0038] A magnet 28 is arranged in the recess 27, for example, glued in place. The magnet 28 is preferably a permanent magnet with a high magnetic coercivity, such as a magnet made of a neodymium-iron-boron alloy or a samarium-cobalt alloy, where the risk of demagnetization at operating temperatures above 50° Celsius is low.

[0039] Regardless of whether the set carrier is now according to Fig. 3a or Fig. 4a As designed, the side of the carrier plate 25 facing away from the tooth base 24.1 forms the top side of the trim strip 23, which allows it to be inserted into the cover rod 14 and attracted by the magnet 28. The carrier plate 25 can be made of a ferromagnetic, electrically conductive tinplate and can then adapt as flexibly as possible to the surface of the magnet 28 in order to lie flush with it.

[0040] The trim strip 23 according to Fig. 4a The carding strip 23 is inserted into the recess 27 with its upper side first being inserted into the groove 29 and then rotated or tilted counterclockwise into the recess 27. The tooth heads of the carding carrier 23 point in the opposite direction of rotation of the drum and are directed towards the fibers to be carded. The interlocking connection between the groove 29 and the spring 26 prevents the carding strip 23 from tilting due to the magnetic connection. The carding strip 23 is thus held not only by friction but also by positive locking and is replaceable in the base of the cover rod 14.

[0041] As an alternative to the embodiment of groove 29 and tongue 26, the positive locking can also be achieved by other means, for example a dovetail shape, an integrated fastening device or an outer cover.

[0042] Regardless of the embodiment shown, the support plate 25 can essentially correspond to the length of the cover rod 14. It would also be conceivable, in principle, that the individual tooth segments 24 could be additionally bonded to the support plate via their tooth base 24.1, e.g., by gluing. Bezugszeichen

[0043] 1 Feeding roller 2 Feeding table 3a, 3b, 3c Tearer 4 Drum 4a Drum assembly 4b Direction of rotation 5 Pick-up 6 Scraper roller 7, 8 Squeeze rollers 9 Fleece guide element 10 Pile funnel 11, 12 Take-off rollers 13 Traveling lid 13a, 13b Lid deflection rollers 14 Lid bar 15 Support body 16 Lid assembly 18 Can 19 Can holder 20a Outer surface 21 Tip circle 22 Tip circle 23 Assembly strip 24 Tooth segment 24.1 Tooth root 24.2 Tooth head 24.3 Tooth 25 Carrier plate 25.1 Long leg 25.2 Short leg 26 Spring 27 Recess 27.1, 27.2 Bridge 28 Magnet 29 Groove αAngle aDistance bDistance r1Radius r2Radius AWorking direction BDirection CReturn transport MCenter point

Claims

1. Clothing strip (23) for a carding element of a spinning mill machine, such as a carding machine, including a support plate (25) and a multiplicity of toothed segments (24), each with a tooth tip (24.2), comprising a plurality of teeth (24.3) and a tooth base (24.1) opposite the tooth tip (24.2), wherein the toothed segments (24) are arranged one behind another in the longitudinal extension of the support plate (25), wherein each toothed segment is supported by the tooth base (24.1) on the support plate (25), wherein the toothed segments (24) are held in place on the support plate (25) by means of a positive-fit connection, and wherein the positive-fit connection is configured by at least one axial end of the toothed segments (24) and a corresponding border area of the support plate (25), wherein the border area of the support plate (25) surrounds the at least one axial end of the toothed segments (24) respectively, characterised in that the support plate (25) is configured as a C-shape in its cross section, including a long leg (25.1) on which the tooth base (24.1) of each individual toothed segment (24) rests and adjoining short legs (25.2) located on both sides of the long leg (25.1), surrounding the two axial ends of the toothed segments (24) in order to create the positive-fit connection, wherein a spring (26), made from the short leg (25.2) itself, is provided on an axial end of the clothing strip (23).

2. Clothing strip (23) according to claim 1, characterised in that the toothed segments (24) are configured so as to form a strip and are preferably arranged separately in a row.

3. Clothing strip (23) according to claim 1 or 2, characterised in that the support plate (25) preferably fully surrounds the tooth base (24.1) of each toothed segment (24).

4. Clothing strip (23) according to claim 1, characterised in that the two axial ends of the toothed segments (24) are bevelled such that together with the surrounding support plate (25), they form a dovetail joint.

5. Clothing strip (23) according to one of the claims 1 to 3, characterised in that the toothed segments (24) have a recess, such as a slot, in the area of the two axial ends for supporting a border area of the support plate (25).

6. Clothing strip (23) according to one of the claims 1 to 5, characterised in that the toothed segments (24) are made from a sheet metal, preferably from corrosion-resistant material and preferably by means of cutting, such as by punching or lasing.

7. Clothing strip (23) according to one of the claims 1 to 6, characterised in that the support plate (25) is made from a sheet metal, preferably from a corrosion-resistant, ferromagnetic, electrically conductive material, such as white metal.

8. Carding element of a spinning mill machine, such as a carding machine, including a clothing strip (23) according to any of the preceding claims.

9. Carding element according to claim 8, wherein the clothing strip (23) is configured according to claim 7, characterised in that the clothing strip (23) is supported in a recess (27) of the carding element.

10. Carding element according to claim 9, characterised in that the recess (27) comprises a magnet (28) for attracting the clothing strip (23) via the support plate (25) to the magnet (28) and holding it in the recess.

11. Carding element according to claim 9 or 10, characterised in that the carding element comprises a groove (29) in the area of the recess (27) inside which a complementarily configured spring (26) of the support plate (25) engages, wherein the spring (26) is configured as a single piece together with the support plate (25), in particular by means of folding.

12. Carding element according to one of the claims 8 to 11, configured as a fixed carding element or as a flat bar (14).

13. Spinning mill machine, such as a carding machine, including a carding element according to one of the claims 8 to 12.