EP2855748B1 - Circular comb for a textile processing machine - Google Patents

Description

The invention relates to a round comb for a combing machine according to the preamble of claim 1.
Round combs on combing machines consist of individual combing segments, which are fastened to a basic body by means of screws or spring / groove system. The combing segments receive successive sawtooth stamping parts, which are usually lined up on support rods.
In the EP 0969129 A2 a round comb is described in which a plurality of comb segments are fastened separately to a base body. According to this prior art, it is very complicated to exchange the individual comb segments and to position them with sufficient accuracy on the base body.
The DE 102009018058 A1 discloses a circular comb in which the individual comb segments are non-positively connected to the base body. To solve the comb segments of the body separate Entriegelungsvorrichtungen are arranged on the body. In one embodiment, the force is applied by a magnet on the comb segment, wherein the magnet is formed as a rod which is arranged in a groove of the base body.

The JP 42008492 discloses the magnetic attachment of Kämmsegmenten on the body of a circular comb.
In the EP 0839934 A1 a combing segment of a circular comb is described, which consists of individual punched parts arranged one behind the other. The stamped parts are arranged in a sequential arrangement so that a prismatic element for insertion and fixing in a groove is formed.
A disadvantage of this prior art is the complex production of body and comb segment, the complex replacement of the comb segments and their insufficient accuracy in positioning on the body.
Based on this prior art, it is an object of the invention to ensure an inexpensive production of the comb segments, as well as their rapid and accurate interchangeability, and to simplify the construction of the circular comb.
The invention solves this problem with the features of claim one. Further advantageous embodiments are characterized by the subclaims.
According to the technical teaching according to claim 1, the circular comb for a combing machine comprises a basic body to which at least two clothing elements can be fastened non-positively by flat magnets on the main body, wherein each clothing element comprises a plurality of tooth segments arranged one behind the other in the direction of a central longitudinal axis of the circular comb are interconnected, and wherein the clothing elements are arranged at least partially overlapping on the base body. For a secure and precise attachment of the magnets on the body is possible, so that a replacement of the clothing elements without loosening a screw is possible. The magnets are flat formed, whereby a much higher holding force can be generated, as with a single magnet, which is designed as a rod and fastened only in one area the clothing element on the base body. It is essential that the force acting on the clothing elements force is applied by a large area of magnets.
In an advantageous embodiment, the magnets are designed as permanent magnets, which exert a permanent magnetic force on the clothing elements.
The magnets may be at least partially fastened on or with the lateral surface of the base body. Depending on the manufacturing process of the magnets, some of which are difficult to process further, different magnetic materials and geometries can be attached to the base body, for example by gluing flat magnets to the base body.
Furthermore, areal magnets can be arranged and fastened in depressions of the base body, in which, for example, a multiplicity of individual magnets are screwed, caulked or pressed to the base body.
In a preferred embodiment, the entire lateral surface of the base body may be formed as a magnet, for example, by a one-piece connection of the magnets by pouring onto the base body.
Advantageously, the clothing elements can be positioned in a form-fitting manner on the base body substantially along the central longitudinal axis. The positive engagement, for example by a spring and a groove allows an exact alignment of the clothing elements on the Body. Furthermore, this form-fitting has the advantage that a displacement of the clothing elements is prevented on the body in the circumferential direction, whereby a peeling action is counteracted due to shear forces.

In order to prevent loosening of the magnetic connection due to force peaks, the clothing elements are arranged at least partially overlapping on the base body. In each case two adjacent clothing elements overlap in the region of an end face in such a way that tilting or raising is prevented.

In a further advantageous embodiment, the clothing elements can be at least partially positively connected to the base body. Even so, it can be ensured that force peaks that act on the clothing elements, do not lead to a release of the clothing elements from the body. In the event that the magnetic force is at least temporarily reduced or eliminated, the positive connection between the clothing element and the base body prevents complete detachment of the clothing element.

Furthermore, a recess can be arranged between each clothing element and the base body, in which a tool for releasing the clothing elements can be attached from each end face. This can be done by a screwdriver or by a specially trained lever that releases the clothing elements against the force of the magnets from the body.

The clothing element has 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 connected to each other. The toothed segments are not strung on a rod and connected to each other, but firmly bonded together, 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 elements.

In a first advantageous embodiment, the toothed segments have at least one groove into which a weld seam is placed for connecting the toothed segments to each other. 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.

The at least one groove is arranged in a preferred embodiment in the region of the tooth root, so that the heat of the weld seam has no or negligible influence on the hardening or heat treatment of the toothed segment, in particular of the tooth head.

In a second advantageous embodiment, at least one toothed segment has a spring. Since the spring is arranged on the tooth root, the spring engages in a groove in the base body of the circular comb and thus enables positioning of the clothing elements on the base body. The spring can be cohesively connected, so for example by a welding process with the toothed segment. Furthermore, when each toothed segment has a spring, the weld seam can be applied to the toothed segment with the spring, so that at the same time the toothed segments are firmly bonded together. In this case, the weld can be arranged as a laser welding or induction welding between the spring and the toothed segment, or on both sides from the outside as a fillet weld.

With the features of the invention, it is possible, the main body and the clothing elements very inexpensive, without consuming screwing produce. At the same time an exchange of clothing elements can be done very quickly and accurately.

Figur 1:

eine perspektivische Ansicht eines Ausschnittes eines Rundkammes in einem ersten Ausführungsbeispiel nicht gemäß der Erfindung;

Figur 2:

eine Darstellung auf eine Stirnfläche eines Rundkammes nach Figur 1;

Figur 3:

ein Ausführungsbeispiel nicht gemäß der Erfindung mit einer vergrößerten Darstellung auf eine Stirnseite eines Rundkammes

Figur 4:

ein Ausführungsbeispiel der Erfindung mit einer vergrößerten Darstellung auf eine Stirnseite eines Rundkammes

Figur 5:

ein weiteres Ausführungsbeispiel der Erfindung mit einer vergrößerten Darstellung auf eine Stirnseite eines Rundkammes

Figur 6a:

eine seitliche Darstellung auf ein Zahnsegment;

Figur 6b:

eine weitere seitliche Darstellung auf ein Zahnsegment;

Figur 7a:

mehrere Zahnsegmente im Profil vor dem Verschweißen;

Figur 7b:

mehrere Zahnsegmente im Profil nach dem Verschweißen.

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

FIG. 1:

a perspective view of a section of a circular comb in a first embodiment not according to the invention;

FIG. 2:

a representation of an end face of a circular comb FIG. 1 ;

FIG. 3:

an embodiment not according to the invention with an enlarged view of an end face of a circular comb

FIG. 4:

an embodiment of the invention with an enlarged view of an end face of a circular comb

FIG. 5:

a further embodiment of the invention with an enlarged view of an end face of a circular comb

FIG. 6a:

a side view of a toothed segment;

FIG. 6b:

another lateral view of a toothed segment;

FIG. 7a:

several tooth segments in the profile before welding;

FIG. 7b:

several tooth segments in profile after welding.

In FIGS. 1 and 2 a section of a circular ridge 1 is shown, which comprises a substantially cylindrical base body 2, which extends along a central longitudinal axis 3. The main body 2 is not executed in this embodiment according to the invention as a hollow cylindrical member, the can be placed on a drive shaft, not shown. Of course, base body 2 and drive shaft can also be made in one piece. The base body 2 is bounded in the radial extent by a lateral surface 4, and limited in the axial extent, ie along the central longitudinal axis 3, by two end faces 5, of which only one is visible in this illustration. On the main body 2 at least two clothing elements 7 are fixed, covering the entire lateral surface 4. In this embodiment, two clothing elements 7 are arranged on the illustrated section of the base body 2. The number of clothing elements 7 may depend, inter alia, on the outer diameter of the circular comb 1 and the toothed segments 10 arranged on the clothing elements 7, and be, for example, two, four, six or eight. Of course, an odd number of clothing elements 7 is possible.

The clothing elements 7 consist of a plurality of toothed segments 10, which are arranged one behind the other and connected to each other. Each toothed segment 10 may consist of one piece of punched sawtooth wire with a tooth tip 11 and a tooth root 12.

The attachment of the clothing elements 7 on the base body 2 is non-positively by magnets 6, which are designed as permanent magnets. The magnets 6 are at least partially arranged and fixed on or with the lateral surface 4 of the base body. This can be done, for example, so that flat trained magnets 6 are inserted into recesses of the base body 2 and pressed with the base body 2, caulked or screwed. In the following, the lateral surface 4 of the main body 2 is equated with the outer surface of the magnets 6.

In an advantageous embodiment, the magnets 6 form the entire lateral surface 4 of the main body 2, in which they, for example, as a sleeve mounted on the body 2 or shrunk. In this embodiment, in particular bonded in plastic magnets 6 can be used. Alternatively, the magnets 6 can also be glued in sections on the base body 2. Depending on the used magnetic alloy is also a one-piece connection with the base body 2, for example by a surface coating, welding or casting on the base body 2 is possible. In particular, the one-piece connection of the magnets 6 with the base body 2 may be advantageous at the high rotational speeds of the circular comb 1 of over 500 revolutions per minute due to the acting centrifugal force.

The magnets 6 are preferably permanent magnets with a high magnetic coercive force, such as magnets with a neodymium-iron-boron alloy or a samarium-cobalt alloy, in which the risk of demagnetization at operating temperatures above 50 ° C is low.

The arrangement of the clothing elements 7 on the base body 2 takes place after FIG. 3 such that the teeth 13 of the toothed segments 10 point in the direction of rotation R of the circular comb 1 and are thus directed against the fibers to be combed. Due to the cylindrical contour of the base body 2, which must correspond very precisely with the concave underside of the clothing elements 7, a certain positive fit during assembly and alignment of the clothing elements 7 is provided parallel to the central longitudinal axis 3. To accurately position the clothing elements 7 on the circumference of the lateral surface 4 on the magnet 6, 4 grooves 8 may be arranged in the lateral surface, in which a corresponding spring 9 engages, which is arranged on the underside 16 of the clothing elements 7. The contour of groove 8 and spring 9 may be rectangular or inclined surface, for example as a triangle or conical in cross-section. In the example of FIG. 3 are formed on the left clothing element 7 groove 8 and spring 9 with a rectangular cross section, and on the right clothing element 7 with a conical cross section. The groove 8 and the spring 9 may extend continuously along the entire lateral surface 4, ie parallel to the central longitudinal axis 3, or only in sections, wherein in the smallest longitudinal extent the spring 9 may be formed as at least one cylindrical pin which engages in a corresponding bore , In the embodiment of FIG. 3 the magnetic layer is thin or the thickness of the magnets 6 shown low, so that the groove 8 or the bore penetrate the magnetic layer and at least partially submerge in the base body 2. The groove 8 can penetrate between 0.5 to 5 mm deep in the base body 2.

A not to be underestimated effect of the positive connection between clothing element 7 and body 2 by the spring 9 and the groove 8 in the circumferential direction of the body 2 is that thus the peeling effect of the magnetic adhesion and thus a displacement of the clothing elements 7 is counteracted on the base body 2. The centrifugal force acting on the single clothing element 7 is superimposed by the combing force acting on the teeth 13 tangentially in the circumferential direction. Since at very high speeds the resulting magnetic force decreases, the peeling effect can be prevented, which otherwise causes not only a displacement of the clothing elements 7 on the body, but in connection with unfavorable force peaks on the teeth 13, e.g. can cause tilting of the clothing elements 7 by thickening in the fibers to be combed, which due to the increasing distance between the magnet 6 and clothing element 7, the magnetic force drops drastically.

In order to prevent precisely this tilting of the clothing elements 7, the clothing elements 7 may overlap in regions. By doing Embodiment after FIG. 4 a left and a right set element 7 are arranged on a base body 2. Each clothing element 7 has a projection 7a and a recess 7b in the region of two opposite end surfaces which extend parallel to the central longitudinal axis 3, which are shown greatly enlarged in this embodiment. Manufacturing technology, the projection 7a and the recess 7b can be prepared by a grinding process. The recess 7b is arranged on the end face of the clothing element 7, which lies in the direction of the inclined teeth 13, ie at the point at which the teeth 13 in the direction of rotation R of the circular comb 1 first dip into the fibers. The projection 7a is arranged on the opposite end face of the clothing element 7, that is opposite to the direction of the inclined teeth 13. As in the embodiment according to FIG. 4 illustrated, the right in the direction of rotation R clothing element 7 overlaps with its projection 7a, the subsequent or left clothing element 7 in the region of its recess 7b. Assuming that the left clothing element 7 engages with its teeth with the fibers and no combing force acts on the previous clothing element 7, the magnetic force of the right clothing element 7 prevents lifting or tilting of the left clothing element 7.

In a further embodiment according to FIG. 5 a clothing element 7 may also be positively connected to the base body 2. In this embodiment, a part of the clothing element 7 penetrates into the main body 2. At the same time, an overlap by a projection 7a through the right clothing element 7 can take place.

To disassemble the clothing elements 7 5 recesses 17 are incorporated either in the clothing element 7 or in the base body 2 in the region of one or both end faces, in which a tool for disassembly of the clothing elements 7 dive and can generate a leverage. In In this embodiment, the recess 17 is arranged in the region of the front side of the clothing element 7, on which also the projection 7a is arranged.

Referring to the Figures 6a to 7b each clothing element 7 consists of a plurality of toothed segments 10, which are lined up in the direction of the central longitudinal axis 3 in a row. Each toothed segment 10 consists of a plurality of teeth 13 each having a tooth tip 11 and a tooth root 12. The tooth tips 11 are directed in the direction of rotation of the circular comb 1 against the fibers to be combed. According to the embodiment of FIG. 6a is in the region of the tooth root 12 at least one groove 14 or recess is incorporated on each toothed segment 10, which serves to receive a weld 15. A clothing element 7 thus comprises a multiplicity of toothed segments 10 lined up with one another and welded together, wherein the weld seam 15 is arranged parallel to the central longitudinal axis 3. In this embodiment, two mutually spaced grooves 14 are arranged so that the tooth segments 10 can no longer warp or twist against each other in the direction of the central longitudinal axis 3 after welding. As an alternative to the two or more spaced-apart grooves 14, the welding can also take place over a surface.

In a further embodiment according to FIG. 6b At least one toothed segment 10 has a separate or one-piece spring 9. Since the spring 9 is arranged on the tooth base 12, that is to say on the underside 16, the spring 9 engages in a groove 8 in the base body 2 of the circular comb 1 ( FIG. 3 ) and thus allows positioning of the clothing elements 7 on the base body 2. The spring 9 as a separate component can be cohesively, so for example, connected by a welding process with the toothed segment 10. Furthermore, when each toothed segment 10 has a spring 9, the weld 15 can be so on the Tooth segment 10 are applied with the spring 9, that at the same time the tooth segments 10 are materially interconnected. In this case, the weld 15 can be arranged as a laser welding or induction welding between the spring 9 and the toothed segment 10, or be executed on both sides from the outside as a fillet weld.

In Figure 7a a plurality of tooth segments 10 are shown side by side in profile, the alignment of the tooth segments 10 is not parallel to each other, but at a predetermined angle a. 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 underside 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. 7b ), 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 a, which is 0 ° after welding, is dependent inter alia on the welding process and the size of the weld 15 and can be set for each clothing element 7 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 bottom 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, protective gas or laser welding methods can be used as the welding method, which, inter alia, enable automated production.

After welding and a possible further heat treatment of the clothing element 7, the underside 16 of the clothing element 7 is over-turned and / or ground and the lateral surface 4 of the base body 2 adapted exactly. In particular, the height of the clothing element 7 from the bottom 16 to the tip of each tooth 13 is precisely adjustable, so that can be quickly maintained by a quick replacement of the clothing elements 7 of the circular comb 1. The juxtaposed and welded toothed segments 10 offer in comparison to the strung on rods tooth segments the advantage that the toothed segments 10 are connected to each other without play. In the arrayed on the rods tooth segments a clearance between the hole in the sector gear and rod is present even after assembly, so that the distance between the tip of a tooth 13 can vary to the lateral surface 4 of the circular comb 1 in a small area.

According to the invention, an efficient and inexpensive production of the clothing elements 7 is possible. Furthermore, the invention enables a simple assembly of the clothing elements 7 on the base body 2, so that a faster and more accurate replacement worn worn clothing elements 7 is ensured.

reference numeral

1

circular comb

2

body

3

central longitudinal axis

4

lateral surface

5

face

6

magnet

7

set element

7a

head Start

7b

recess

8th

groove

9

feather

10

toothed segment

11

addendum

12

tooth root

13

tooth

14

groove

15

Weld

16

bottom

17

deepening

α

angle

R

direction of rotation

Claims (14)

1. A circular comb for a combing machine, comprising a basic body having at least two clothing elements (7) and two-dimensionally configured magnets (6), wherein the two clothing elements (7) are non-positively attachable to the basic body (2) by means of two-dimensionally configured magnets (6), characterized in that each clothing element (7) comprises a plurality of toothed segments (10), which, in the direction of a central longitudinal axis (3) of the circular comb (1), are disposed one after the other and are connected to each other, and in that the clothing elements (7) at least partially are disposed overlappable on the basic body (2).
2. The circular comb according to claim 1, characterized in that the magnets (6) are configured as permanent magnets.
3. The circular comb according to claim 1, characterized in that the magnets (6) are attachable at least section-wise on or to the lateral surface (4) of the basic body (2).
4. The circular comb according to claim 3, characterized in that the magnets (6) are disposed and attachable in recesses of the basic body (2).
5. The circular comb according to claim 1, characterized in that the entire lateral surface (4) of the basic body (2) is configured as a magnet (6).
6. The circular comb according to any of the preceding claims, characterized in that the clothing elements (7) are arrangeable positively positionable on the basic body (2) essentially along the central longitudinal axis (3).
7. The circular comb according to any of the preceding claims, characterized in that the clothing elements (7) are at least partially positively connectable to the basic body (2).
8. The circular comb according to any of the preceding claims, characterized in that at each front face (5) between each clothing element (7) and the basic body (2) is disposed a recess (17), into which a tool may engage for releasing the clothing elements (7) from the basic body (2).
9. The circular comb according to any of the preceding claims, characterized in that each toothed segment (10) comprises several teeth (13), which respectively include a tooth head (11) and a tooth root (12), wherein the toothed segments (10) are disposed parallel with regard to each other and are connected to each other by material.
10. The circular comb according to claim 9, characterized in that the connection by material is realized by means of a weld seam (15).
11. The circular comb according to claim 9, characterized in that the toothed segments (10) include at least one groove (14), within which the connection by material is realized.
12. The circular comb according to claim 11, characterized in that the at least one groove (14) is disposed in the area of the tooth root (12).
13. The circular comb according to claim 9, characterized in that at least one toothed segment (10) includes a spring (9).
14. The circular comb according to claim 13, characterized in that the spring (9) is connected by material to the toothed segment (10).

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