EP2855749B1 - Fitting and flat bar for a textile processing machine - Google Patents

Description

The invention relates to a clothing and a flat rod for a textile processing machine.

Amongst other things, carding machines have the task of dissolving fiber flakes down to the individual fiber, as well as the nits. For this purpose, the fiber flakes are passed between a spool and a revolving lid, the fibers are aligned and separated. For this purpose, the tambour is usually equipped with a circumferential saw tooth set, in which individual teeth are produced from a flat wire by means of punching. The revolving lid usually consists of many flat bars with flexible sets in which a plurality of individual wires are attached in elastic fabric inserts, the tips of which correspond at very close distance with the tips of the sawtooth of the main cylinder and thus form the carding gap.

In order to ensure the tight carding gaps safely over a long battery life, all associated components must have high precision. In particular, the wear and replacement of the flexible sets may result in regrinding and reassembly of the flat bar unwanted inaccuracies. Furthermore, the flexible trimmings are very expensive to manufacture with the further disadvantage that they allow only limited regrinding. Another disadvantage is that the entire flat bars including the set must be dismantled and machined in the grinding machine, because only so the ready-to-install tolerance can be kept below 0.1 mm.

In the DE 102009013412 A1 is described a flexible set for a flat bar, which is fastened by means of magnet on the flat bar. A disadvantage is the complex design of the clothing, in which the clothing strip is glued only on a metal strip, to then be magnetically fixed in a recess of the flat bar. Another disadvantage is the use of the hook, which are elaborately incorporated in a fabric body and which allows only a limited and complex number of regrinds.

In the US 3,793,677 the attachment of a garnish is described on a flat bar, in which the sawtooth wires are embedded in a cured plastic to the teeth.

The EP 0043868 A1 discloses the attachment of garniture wires to a U-shaped sheet metal by means of a fillet weld, wherein the weld seam is arranged on the end faces of the garniture wires and is later at least partially ground to obtain a flat contour.

In the CH 654341 The clothing wires are soldered or welded over their entire length on the foot with a clothing wire arranged next to it.

Also the EP 0067599 A1 discloses the attachment of garment wires by means of tape at the foot of the clothing.

Based on this prior art, it is an object of the invention to provide an inexpensive and precisely producible clothing strip.

The invention solves this problem with the features of claims 1 and 3; Further advantageous embodiments are characterized by the subclaims.

According to the technical teaching, the clothing strip for use in a textile processing machine comprises a plurality of

Tooth segments, each having a plurality of teeth, each having a tooth tip and a tooth root, wherein the tooth segments are arranged parallel to each other and directly or indirectly connected to each other.

The invention is characterized in that the connection of the tooth segments takes place cohesively, whereby the tooth segments are completely free of play with each other.

The cohesive connection, for example, by a laser or inert gas welding, allows a largely automatic production of clothing strips, which is much faster and more accurate than the production of trimmings in which the prongs are inserted into a fabric body.

In this case, the toothed segments for direct connection at least one groove, within which the cohesive connection is arranged. Through the groove, the outer contour of the tooth segments is not changed. At the same time, the weld has a higher fatigue strength than a surface-applied weld, which is then partially ground off.

Furthermore, the at least one groove can be arranged in the region of the tooth root, which results in only a slight heat load on the hardened tooth heads.

An indirect connection of the tooth segments with each other can be done via a metal strip to which the tooth segments are connected by a plurality of welds. The metal strip allows a more flexible and planar application to a fixture within the flat bar and a high tolerance accuracy of the clothing strip. In order to achieve the highest possible flexibility, it should be ensured that in this indirect connection, the toothed segments are not welded together, but are only attached to the metal strip.

The welds are arranged in the longitudinal direction of the clothing strip, have a limited length, and are offset from one another. The clothing strip is thus flexible and can rest flat with a minimum of rework within the flat bar. It may be advantageous if the toothed segments have offset grooves in the region of the welds. By an alternate arrangement of the grooves only every second toothed segment is connected to the metal strip over this weld, so that juxtaposed tooth segments are not fastened at the same time with the same weld on the sheet metal strip. This prevents a connection of the tooth segments with each other. The metal strip is so flexible at least in the longitudinal direction that it can adapt to the surface of a magnet with a small amount of rework.

Advantageously, the welds in the longitudinal direction of the clothing strip can at least partially overlap, whereby the clothing strip is flexible.

A further reduction of the rigidity is achieved in that the metal strip has at least one slot orthogonal to its longitudinal direction. The slots can extend only over a portion of the width of the sheet metal strip.

A flat rod for a textile processing machine comprises a recess for receiving a clothing strip, which comprises a plurality of tooth segments, which can be fastened by means of magnetic force on the flat rod. Thus, an easy assembly or disassembly of the clothing strip is made possible by the flat bar, the so when replacing or Regrinding the clothing strip may remain in the spinning mill. About the magnetic connection of clothing strip with the flat bar can Precision tightening of the tips of the teeth can be carried out with high precision while maintaining the smallest tolerances. The top of the clothing strip is flat on the magnet in the flat bar, so that no assembly inaccuracies can occur. Furthermore, the top of the clothing strip reference point for the grinding machine, which in contrast to the elastic crochet sets has the necessary strength and does not rebound during the grinding process.

Characterized in that at least one toothed segment has a spring with which a positive connection with the flat bar can be produced, force peaks during carding can not solve the magnetic connection. The integrated on the sector gear spring allows accurate mounting of the clothing strip on the flat bar without additional mechanical components, since the spring is punched in one operation in the manufacture of teeth with out of the flat wire or a profiled wire out.

Figur 1:

einen Deckelstab nach dem Stand der Technik in Seitenansicht;

Figur 2:

eine seitliche Darstellung auf einen Garniturstreifen;

Figur 3:

eine weitere seitliche Darstellung auf einen Garniturstreifen, der nicht in den Schutzbereich der Erfindung fällt;

Figur 4:

eine Darstellung in Längsrichtung des Garniturstreifens;

Figur 5:

eine Draufsicht auf die Oberseite eines Garniturstreifens;

Figur 6:

eine Draufsicht auf die Oberseite eines Garniturstreifens nach einem weiteren Ausführungsbeispiel;

Figur 7:

mehrere Zahnsegmente im Profil vor dem Verschweißen;

Figur 8:

mehrere Zahnsegmente im Profil nach dem Verschweißen;

Figur 9:

die Montage eines Garniturstreifens in einen Deckelstab.

The invention will be explained in more detail with reference to a possible schematically illustrated embodiment. Show it:

FIG. 1:

a flat bar according to the prior art in side view;

FIG. 2:

a side view of a clothing strip;

FIG. 3:

a further side view of a clothing strip, which does not fall within the scope of the invention;

FIG. 4:

a representation in the longitudinal direction of the clothing strip;

FIG. 5:

a plan view of the top of a clothing strip;

FIG. 6:

a plan view of the top of a clothing strip according to another embodiment;

FIG. 7:

several tooth segments in the profile before welding;

FIG. 8:

several tooth segments in profile after welding;

FIG. 9:

the assembly of a clothing strip in a flat bar.

A known prior art flat bar 1 is shown in FIG FIG. 1 shown in side view. The flat bar 1 comprises a lid head, not shown here, which generates a certain stiffness with its geometry and thus generates a constant carding gap across the width of a drum of a card or a carding machine with its sawtooth set. On the cover foot 1a, two webs 1b, 1c arranged on both sides form a recess 1d, which is suitable for receiving at least one flat clothing 4. The recess 1d according to this example is designed in two stages, so that a magnet 3 is fixedly connected via an attachment 2 with the flat rod 1. The attachment 2 can be designed as an adhesive bond or other cohesive connection, or as a mechanical connection. The flat cover 4 essentially comprises a support element 6, which receives the hooks 7, and a steel sheet 5, which is connected to the support element 6. The support element 6 is usually formed from a textile structure or a fabric body, in which the plurality of hooks is tightly integrated. The steel sheet 5 is held by means of magnetic force on the magnet 3. The check marks 7 point with their tip on the spool and form the Kardierspalt with the teeth of the saw tooth set, not shown.

According to the invention, each clothing strip 8 follows FIG. 2 from a plurality of toothed segments 10, which are lined up one behind the other. Each toothed segment 10 consists of a plurality of teeth 13 each having a tooth head 11 and a tooth root 12. The tooth heads 11 are directed against the direction of rotation of the main cylinder, not shown, against the fibers to be combed. According to the embodiment of FIG. 2 is in the region of the tooth root 12 on each toothed segment 10 at least a groove 14 or recess is incorporated, which serves to receive a weld 15. A clothing strip 8 thus comprises a multiplicity of toothed segments 10 lined up with each other and welded together, wherein the weld seam 15 is arranged parallel to the longitudinal axis of the flat rod 1. The toothed segments 10 are connected to each other directly via a weld 15. In this embodiment, two mutually spaced grooves 14 are arranged so that the tooth segments 10 can no longer warp or twist after welding. On one side of the clothing strip 8, an extension in the form of a spring 9 can be arranged, which engages in a corresponding groove 1e of the flat rod 1. The clothing strip 8 consist of a plurality of toothed segments 10, which are arranged one behind the other and connected to each other. Each sector gear 10 may consist of one piece punched sawtooth wire or a profiled wire with a tooth tip 11 and a tooth root 12.

In the non-inventive embodiment of FIG. 3 the toothed segments are executed with staggered teeth 13, 13a, wherein the offset of the teeth 13, 13a can be repeated over the entire length of the clothing strip 8 or flat rod 1. In this embodiment, at least one weld 15 is applied to the upper surface of the toothed segments 10, which thus forms the upper side 16 of the clothing strip 8. The toothed segments 10 are connected to each other directly via a weld 15.

In the embodiment of FIG. 4 For the production of the clothing strip 8, a sheet metal strip 17 is used which corresponds in its length substantially to the length of the flat bar 1. Below the metal strip 17, a plurality of toothed segments 10 are arranged, which are materially connected to the sheet metal strip 17. The tooth segments 10 are with their tooth base 12 under the metal strip 17 positioned. In a device or cassette, not shown, the toothed segments 10 can be lined up according to the length of the flat bar 1. The sheet metal strip 17 is positioned on the toothed feet 12 and connected to the toothed segments 10 with a material fit. As a preferred type of connection, a welding method is used, for example laser welding, with which a cohesive connection between the toothed segments 10 and the sheet metal strip 17 is produced. Due to the cohesive connection, the side remote from the tooth root 12 of the metal strip 17 forms the top 16 of the clothing strip 8. The metal strip 17 can be made of spring steel and should be as flexible as possible to adapt to the surface of the magnet 3 in order to fit flush. The toothed segments 10 are indirectly connected to each other via the metal strip 17 by means of a plurality of welds 19.

In FIG. 5 is the plan view of the top 16 of a metal strip 17 shown, in which a plurality of toothed segments 10 are arranged below the metal strip 17 transverse to the longitudinal direction of the flat bar. For the sake of illustration, only five tooth segments 10 are shown below the sheet metal strip 17. In the embodiment of FIG. 5 the toothed feet 12 are connected by laser welding to the sheet metal strip 17, wherein the welds 19, which are only symbolically indicated here, can extend in a simple non-inventive embodiment without interruption over the entire length of the sheet metal strip 17. In this case, at least two weld seams 19 are preferably arranged parallel to one another, which connect each toothed segment 10 to the sheet metal strip 17. Depending on the welding process (resistance welding, MIG, MAG welding, laser welding), it may be necessary to provide the sheet metal strip 17 along the planned weld 19 with a narrow longitudinal groove (not shown), the is at least partially filled during the welding process with the weld metal.

In this embodiment, the welds 19 extend only over a certain length of the sheet metal strip 17 and partially overlap each with two other welds 19, so that a limited number of tooth segments 10 are connected with four welds with the metal strip 17, all other tooth segments 10th only with two welds 19. In the longitudinal direction of the flat rod results in a flexibility of the metal strip 17, which thereby better adapts to the magnet, which has the advantage that, in contrast to the embodiment of FIG. 2 or 3 the top 16 can be machined with less precision. A good compromise of economic production and the highest possible flexibility of the metal strip 17 is achieved when the welds do not pass over the entire length of the flat bar 1, but have only a limited length and are offset from one another. Due to this limited rigidity, the necessary reworking of the upper side 16 can be reduced, with the clothing strip 8 being able to rest flush against the magnet 3.

An even greater flexibility of the metal strip 17 as a carrier material for the tooth segments can be achieved if slits 18 are arranged in the sheet metal strip 17 parallel to the arrangement of the tooth segments 10 and thus transversely or orthogonally to the longitudinal direction of the flat bar. To FIG. 6 extend the slots 18 only over a portion of the width of the metal strip 17 so that on the one hand the necessary stability of the metal strip 17 is not endangered as a support body, but on the other hand sufficient flexibility is generated, and thereby the top 16 of the clothing strip 8 of the surface of Magnet 3 can adapt with a minimum of rework. Furthermore, the slots 18 - similar to the welds 19 - overlap at least partially over their length. In this embodiment, the slots 18 do not overlap with the welds 19, but this may well be possible.

In principle, the highest flexibility in the longitudinal direction of the clothing strip 8 is achieved by the toothed segments 10 are not connected to each other by the welding process, but are only welded to the sheet metal strip 17.

Depending on the welding method, apparatus and depending on whether the toothed segments 10 are welded with or without metal strips 17, can accordingly FIGS. 7 and 8 the alignment of the toothed segments 10 are not parallel to each other, but α at a predetermined angle. The feet 12 touch only at the lowest point and go to the tooth head 11 apart. During or after the welding of the toothed segments 10 with one another by placing a weld seam 15 on the upper side 16 of the toothed segments 10, the toothed segments 10 are aligned with each other due to the distortion in the weld seam 15 (FIG. Fig. 8 ), so that they then arrange parallel to each other and touch in the area of the tooth root 12 over the entire surface. The angle α, which is 0 ° after welding, depends inter alia on the welding method and the size of the weld 15 and can be set for each clothing strip 8 during pre-assembly. The adjustment of the correct angle α can take place by means of unillustrated intermediate pieces in a device, which are arranged between the tooth heads 11. The device, not shown, may have a curved surface on which the toothed segments 10 are arranged with their top 16 in a row. The curvature of the surface corresponds to the angle α and the expected distortion of the weld seam 15. In particular inert gas or Laser welding can be used, which enable, among other things, an automated production.

After welding and a possible further heat treatment of the clothing strip 8, the upper side 16 of the clothing strip 8 is milled and / or ground and exactly adapted to the surface of the magnet 3. In particular, the height of the clothing strip 8 from the upper side 16 to the tip of each tooth 13 is precisely adjustable, so that the flat bar 1 can be quickly maintained by a quick replacement of the clothing strips. The juxtaposed and welded toothed segments 10 offer in comparison to the hooks the advantage that the toothed segments 10 are connected to each other without play.

According to the invention, an efficient and inexpensive production of clothing strips 8 is possible. Furthermore, the invention enables a simple assembly of the clothing strips 8 in the flat bar 1, so that a faster and more precise replacement of worn clothing strips 8 is ensured without disassembling the flat bar 1. A particularly important advantage is the precise regrinding and assembly of the clothing strip 8 without having to dismantle the flat bar 1. It can thus comply with very small tolerances on the carding gap.

The assembly of the clothing strip 8 in the flat cover 4 is exemplary in FIG. 9 shown. In the recess 1d between the webs 1b and 1c, a magnet 3 is arranged by means of a fastening 2, wherein the attachment 2 can be designed as a mechanical connection to the cover foot 1a, or as cohesive connection, for example as an adhesive bond. As the magnet 3 are preferably permanent magnets with a high magnetic coercive force, such as magnets with a neodymium-iron-boron alloy or from a samarium-cobalt alloy, where the risk of demagnetization at operating temperatures above 50 ° Celsius is low.

The clothing strip 8 is mounted with its upper side 16 in the recess 1 d, in which the spring 9 is first inserted into the groove 1 e and the clothing strip 8 is rotated or tilted around the groove 1 e in the recess 1 d counterclockwise. The tooth heads 11 have in their inclination against the direction of rotation of the spool and are directed against the fibers to be carded. There is a risk of tilting for the clothing strip 8, since the first force application point for the carding in the region of the web 1b is located. Due to the positive connection between the groove 1e and spring 9, the tilting of the clothing strip 8 is prevented by the magnetic connection. The clothing strip 8 is thus not only frictionally, but also positively held in the cover foot 1a. As an alternative to the embodiment of groove 1e and spring 9, the positive connection can also be produced by other means, for example a dovetail shape, an integrated fastening means or an outer cover.

The dismantling of the clothing strip 8 via not shown grooves in the region of the web 1c, in which a tool used and solve by means of leverage the clothing strip 8 from the magnet 3 and can be levered out of the recess 1d out in the clockwise direction.

reference numeral

1

flat bar

1a

Deckelfuß

1b

web

1c

web

1d

recess

1e

groove

2

attachment

3

magnet

4

flat clothing

5

sheet steel

6

supporting member

7

wire hooks

8th

clothing strips

9

feather

10

toothed segment

11

addendum

12

tooth root

13, 13a

tooth

14

groove

15

Weld

16

top

17

metal strip

18

slot

19

Weld

α

corner

Claims (7)

1. A clothing strip for use in a textile processing machine, in particular for use in a carding machine or roller card, comprising a plurality of toothed segments (10) respectively having several teeth (13), which respectively include a tooth head (11) and a tooth root (12), wherein the toothed segments (10) are disposed parallel to each other and directly connected to each other, wherein the connection of the toothed segments (10) is realized positively by material by a weld seam (15), characterized in that the toothed segments (10) include at least one groove (14), within which the positive connection by material is disposed.
2. The clothing strip according to claim 1, characterized in that the at least one groove (14) is disposed in the area of the tooth root (12).
3. A clothing strip for use in a textile processing machine, in particular for use in a carding machine or roller card, comprising a plurality of toothed segments (10) respectively having several teeth (13), which respectively include a tooth head (11) and a tooth root (12), wherein the toothed segments (10) are disposed parallel to each other and indirectly connected to each other, wherein the toothed segments (10) are connected by several weld seams (19) with a sheet-metal strip (17), characterized in that the weld seams (19) are disposed in longitudinal direction of the clothing strip (8) and have a limited length, and in that the weld seams (19) are disposed offset to each other.
4. The clothing strip according to claim 3, characterized in that the weld seams (19) at least partially overlap each other in longitudinal direction of the clothing strip (8).
5. The clothing strip according to claim 3, characterized in that the sheet-metal strip (17) includes at least one slot (18) orthogonally to the longitudinal direction thereof.
6. The clothing strip according to claim 3, characterized in that the sheet-metal strip (17) includes several slots orthogonally to the longitudinal direction thereof, wherein the slots (18) only extend over a partial area of the width of the sheet-metal strip (17).
7. The clothing strip according to claim 1 or 3, characterized in that at least one toothed segment (10) includes a spring (9).

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