EP2451998B1 - Comb element - Google Patents

Description

The invention relates to a comb element for a comb segment of a combing roller rotatable about a rotation axis in a textile machine for combing cotton fibers.

Combs for use in combing machines are known by prior public use, wherein on a base body at least one comb element is arranged, which is in engagement with the cotton fibers to be combed. The active combing area of a circular comb can be, for example, 78 °, 90 °, 111 °, 180 ° of the circumference of the generatrix of the circular comb or even the entire circumference. A circular comb with an active combing area along its entire circumference is referred to as a 360 ° circle comb. As comb elements needles, pin strips, sawtooth wire sections, comb teeth or sawtooth punched parts are used, wherein in itself preassembled comb elements are also referred to as bars or comb segments.

A comb segment has z. B. several, in the direction of a rotation axis of the combing roller juxtaposed comb elements with teeth, z. B. in the form of Sägezahnstanzteilen or toothed pulleys, on. Depending on the design of the teeth and their arrangement on the comb segment in the direction of the axis of rotation and in a rotational direction about the axis of rotation, a combing effect of the comb segment is influenced. In addition, the cleaning of ausgekämmter fibers from the toothed disks of a comb segment on the design of the teeth and their arrangement depends on the comb segment.

The DE 39 04 178 A1 shows a comb segment with a plurality of comb elements, each having a different number of teeth. From the DE 199 56 911 A1 For example, teeth of non-rectangular cross-sectional geometry are known so as not to make an intermediate region between teeth of adjacent comb elements of a comb segment non-rectangular.

The combing action on the fibers is ensured by the engagement of the teeth in the fibers to be combed, wherein the combed fiber passes through a tooth space between two adjacent teeth of a comb member. Basically, the combing effect increases with a reduction in the size of the interdental space, but also reduces the accessibility of the interdental space, so that its cleaning, in particular the removal of combed particles and / or fiber components, is difficult. In this respect, a desired high combing effect on the one hand and good accessibility of the interdental spaces on the other hand represent conflicting design requirements for a bolt.

WO 01/61089 A1 shows a generic state of the art.

It is the object of the present invention to develop a comb element for a comb segment of a combing roller for combing cotton with a high combing effect in such a way that in addition the cleaning of interdental spaces is easily possible.

This object is achieved by a comb element with the features specified in claim 1.

A comb element according to the invention for a comb segment of a combing roll rotatable about an axis of rotation comprises a foot part with a circumferential surface curved along a generatrix, several of which extend from the Outer surface relative to the axis of rotation in the radial direction wegerstreckende, along the generatrix of successively arranged teeth and a plurality of each between two adjacent teeth disposed tooth spaces, each allow a passage to combing fibers in a fiber passage direction at a radial penetration depth. In this case, each tooth has four tooth edges, wherein an imaginary connecting line is defined in a tooth gap between a rear tooth line along the surface and in the fiber passage direction of a tooth space delimiting the first tooth and a front along the surface and in the fiber passage direction rear tooth edge of a tooth space defining second tooth is and the surface line and the connecting line include a Kämmwinkel α of at least 15 °. The inventive determination of the Kämmwinkels α optimal combing due to a high combing effect on the cotton fibers to be combed and on the other hand, a gentle treatment of a single fiber is guaranteed, so that fewer fibers are broken and thereby shortened. The comb element according to the invention can also be used for a comb segment, which is mounted on a combing roller and is operated at comb speeds of more than 450 Kammspiele / min and more than 500 Kammspiele / min. At such high comb speeds, there is the danger that the fibers to be combed by almost at the outer ends of the teeth, the so-called Kämmradius, which defines an enveloping cylinder, flow past, since the fibers do not penetrate sufficiently into the interdental spaces. The inventive design of the comb elements, the penetration of the fibers is facilitated in the interdental spaces, so that the passage past the fibers is avoided even at the aforementioned, very high comb speeds. The mesh angle is at least in sections in the radial direction increasing. This increases the requirement for combing action and the possibility of cleaning depending on the fiber type to be combed.

In a design of the comb element according to claims 2 or 3, the requirements for combing action and possibility for cleaning depending on the type of fiber to be combed can be adjusted individually.

A comb element according to claim 4 enables a particularly advantageous, stable and continuous combing process with high combing effect, as a fiber to be combed is held due to reaction forces of the teeth on the fiber in the interdental space and unintentional leaving the fiber of the interdental space, for example by moving it upwards is prevented.

By means of a design of a comb element according to claims 5 to 7, an advantageous influencing of the meshing angle α can take place along the generatrix of a comb element. As a result, the combing action and the possibility of cleaning the spaces between the teeth can be varied within a comb element in order to increase the combing effect along the surface line, for example, while maintaining a constant penetration depth. For this purpose, the meshing angle α along the surface line is set increasing or progressively increasing. By cyclically varying the Kämmwinkels α along the generatrix a cyclically varying combing effect is achieved. This is characterized by the fact that on the one hand by the use of the circular comb according to the invention different degrees of tensile forces act on the combed fibers. As a result, different strong forces resulting from friction of the fibers at the tooth edges, whereby the cleaning of the fibers and thus the overall combing effect is increased overall. On the other hand, different tensions in the individual fibers result, whereby fiber knots are generally reduced.

A comb member with a Kämmwinkel α according to claim 8 is particularly suitable for combing langstapliger cotton with a fiber length of more than 33 mm, which requires a Kämmwinkel α of at least 18 °, and for processing mixtures of cotton fibers with synthetic fibers, for which a comb element with a combing angle α of at least 20 ° is advantageous.

A comb element according to claim 9 increases the design variety in determining the Kämmwinkels α and in particular the change in the Kämmwinkels α along the generatrix of the comb element.

The design of a comb element according to claims 10 to 12 has proven to be particularly advantageous with respect to the achieved combing effect. Fibers, which are combed in a tooth space in the region of a maximum Kämmwinkels, are drawn from there at a decreasing in the radial direction Kämmwinkel due to reaction forces of the tooth flanks in the tooth base and thus against the radial direction. This is a combing process with such designed comb elements also particularly robust. Passing the fibers at the outer tips of the teeth, especially at high comb speeds of more than 450 comb / min and more than 500 comb / min, is avoided, thereby resulting in an improved combing effect.

The design of a comb element according to claim 13 allows a gentle engagement of the teeth in the fiber to be combed. Rounded tooth edges of a tooth reduce stress on the combed fiber as it passes through the interdental space, thereby reducing the risk of fiber breakage. The meshing angle α is defined in accordance with an attachment point of the fiber at the rounded tooth edge.

Embodiments are explained below with reference to the drawing.

Fig. 1

eine zu einer Drehachse einer Kämmwalze senkrechte Seitenansicht eines Kreiskamms mit mehreren Kammsegmenten;

Fig. 2

eine zu Figur 1 ähnliche Seitenansicht in vergrößerter Darstellung eines erfindungsgemäßen Kammelements des Kammsegments in einer ersten Ausführungsform;

Fig. 3 bis 9

Schnittdarstellungen gemäß den Schnittlinien III-III bis IX-IX in Figur 2;

Fig. 10

eine zu den Figuren 3 bis 9 ähnliche Schnittdarstellung einer weiteren Ausführungsform eines Kammelements in einer zweiten Ausführungsform mit abgerundeten Zahnkanten und

Fig. 11

eine zu Figur 2 ähnliche, vergrößerte schematische Seitenansicht eines Kammelements zur Darstellung eines Zahnzwischenraums gemäß einer dritten Ausführungsform.

In this show:

Fig. 1

a side view of a circular comb with a plurality of comb segments that is perpendicular to a rotation axis of a combing roller;

Fig. 2

one too FIG. 1 similar side view in an enlarged view of a comb element according to the invention of the comb segment in a first embodiment;

Fig. 3 to 9

Sectional views according to the section lines III-III to IX-IX in FIG. 2 ;

Fig. 10

one to the FIGS. 3 to 9 Similar sectional view of another embodiment of a comb element in a second embodiment with rounded edges and tooth

Fig. 11

one too FIG. 2 similar, enlarged schematic side view of a comb member for illustrating a tooth gap according to a third embodiment.

An in FIG. 1 illustrated circular comb 1 has a hollow cylindrical combing roll 2 with a rotation axis 3. At the combing roller 2 a total of ten comb segments 5 are mounted in the direction of rotation 4. The comb segments 5, which are also referred to as bolts, define with their axial extent parallel to the axis of rotation 3 a combing area of the circular comb 1. Each comb segment 5 comprises a plurality of identical stamped comb elements 6, which are lined up substantially one behind the other in the direction of the axis of rotation 3. Each comb element 6 has a plurality of teeth 7 and is therefore also referred to as a toothed disk. The comb elements 6 are preassembled in the embodiment shown to form a so-called latch and secured to the combing roller 2 by clamping. Alternatively, the bars can also be connected by screws with the combing roll 2. It is also possible not vorzumontieren the comb elements 6, but set up in a grouped arrangement directly on the combing roller 2 and to stick with this.

An in FIG. 2 illustrated comb element 6 of a comb segment 5 comprises a foot part 8 with a jacket surface 10 curved along a surface line 9, from which with respect to the axis of rotation 3 in the radial direction 11 teeth 7, 12 extend, which are arranged along the surface line 9 in a row. Each tooth 7, 12 comprises a tooth tip 13 for the engagement of the tooth 7, 12 in a fiber to be combed, a Zahnkämmbereich 14, within which a combing action of the comb member 6 with the teeth 7, 12 is applied to the fiber, and a tooth root 15th . with which the teeth 7, 12 are attached to the foot part 8 of the comb element 6. Starting from the foot part 8, the tooth root 15, the tooth combing area 14 and the tooth tip 13 are arranged in the radial direction 11 to the outside and integrally connected to each other. Through the tooth tips 13 of the comb element 6, an envelope line 30 is fixed parallel to the surface line 9, which is arranged at a radial distance of a combing radius r _K to the rotation axis 3. The envelope 30 defines an imaginary envelope cylinder with a jacket surface enveloping the combing roller.

Along or in the direction of the generatrix 9, i. Along the direction of rotation 4, the tooth 7, 12 has a front tooth flank 17, the so-called tooth face, and a rear tooth flank 16, the so-called tooth back, both of which have a curved contour in the radial direction 11 such that the tooth 7, 12 along the surface line 9 on the front tooth flank 17 has a concave contour and along the rear tooth edge 16 has a convex contour. Between the two adjacent teeth 7, 12, a tooth space 18 with a tooth height H1 is defined by the rear tooth flank 16 of the front tooth 12 and the front tooth flank 17 of the rear tooth 7. According to the comb element 6, the tooth heights H1, H2 of two adjacent interdental spaces 18, 19 vary cyclically. It is also possible that a change of the tooth heights H1, H2 does not occur cyclically, in particular also two adjacent interdental spaces and in particular also all interdental spaces of a comb element can have identical tooth heights. Likewise, more than two different tooth heights can be provided.

By means of the in FIG. 2 Plotted section lines III-III to IX-IX corresponding FIGS. 3 to 9 will be a change of one below yet to be defined Kämmwinkels α along the radial direction 11 as a function of a respective penetration depth E of a fiber to be combed in the corresponding interdental space explained. The penetration depth E is measured from the envelope 30 against the radial direction 11. Exemplary is the corresponding to the section line III-III penetration depth E _III in Fig. 2 located. It is clear from this that a maximum penetration depth E _{max can} at least theoretically assume the value of the maximum tooth height H1. In practice, it has been found that the maximum penetration depth E _{max of} the fibers into the interdental space 18, 19 is about 80% to 85% of the maximum tooth height H1.

The sectional views of the FIGS. 3 to 9 each refer to the same pair of teeth 7, 12 with the interdental space 18 arranged therebetween. For the sake of clarity, the lines of intersection III-III to IX-IX, which are each defined by different positions in the radial direction 11, at different teeth in the FIG. 2 shown.

As in FIG. 3 shown, each tooth 7, 12 has a substantially rectangular cross-sectional area with four tooth edges 20 to 23, wherein the respective front tooth flank 17 of the two along the surface line 9 front tooth edges 22, 23 and the respective rear tooth flank 16 of the two along the Mantellinie 9 rear tooth edges 20, 21 are limited. The tooth space 18 allows a passage of a fiber to be combed in a fiber passage direction 24, which is oriented parallel to the rotation axis 3.

Furthermore, in FIG. 3 an imaginary connecting line 25 is shown in the interdental space 18 by the front along the surface line 9 and in the fiber passage 24 rear tooth edge 23 of the gap 18 defining first (rear) tooth 7 and along the surface line 9 rear and in the fiber passage direction 24 front tooth edge 20th of the tooth space 18 limiting second (front) tooth 12 is fixed. The connecting line 25 and the generatrix 9 include a meshing angle α ₁ of about 8.2 °. The combing effect of the comb element 6 is in the region of the tooth tips 13, in which the in Fig. 3 Section shown is not sufficient for combing cotton, since it was recognized that for this application, a mesh angle α of at least 15 ° is particularly favorable.

The in FIG. 4 illustrated cross section shows the teeth 7, 12 in comparison to the illustration FIG. 3 at a greater penetration depth E, where also in the illustration in FIG. 4 the cutting plane passes through the tooth tips 13 of the teeth 7, 12. The included by the connecting line 25 and the surface line 9 angle α ₂ is greater than the angle α ₁ 12.8 ° as shown in FIG FIG. 3 , The enlargement of the meshing angle α ₂ is based on a respect to the FIG. 3 increased width, ie extension in the fiber passage direction 24, the teeth 7, 12 in the sectional plane shown. Nevertheless, the meshing angle α _{2 is} less than 15 ° and thus not large enough to achieve the particularly advantageous combing effect in cotton fibers.

This means that a fiber, which is detected in the region of the tooth tips 13 between two teeth 7, 12, is not optimally combed. For the fiber due to reaction forces of the tooth flanks 16, 17 on the fiber against the radial direction 11 inwardly into the interdental space 18 out or pulled.

FIG. 5 shows a section through the teeth 7, 12 also through their Zahnkämmbereiche 14. The hatched cross-sectional areas of the teeth 7, 12 are in this sectional plane opposite to in FIG. 4 shown enlarged, in comparison to the illustration in FIG. 4 the sectional surfaces of the teeth 7, 12 have an increased width. Furthermore, the meshing angle α ₃ enclosed by the surface line 9 and the connecting line 25 is approximately 19.9 ° greater than the meshing angles α ₁ and α ₂ according to FIGS FIGS. 3 and 4 in cutting planes through the tooth tip 13. With a comb element with the meshing angle α ₃ a very good combing effect is achieved for combing cotton fibers. It is also possible to comb long-staple cotton with a fiber length of more than 33 mm, since the minimum combing angle of 18 ° is satisfied.

As in FIG. 5 are in the FIGS. 6 and 7 also cross sections respectively represented by the tooth combing region 14 of the teeth 7, 12, wherein the cross-sectional areas of the teeth 7, 12 in FIG. 6 is maximum. The corresponding Kämmwinkel α ₄ ≈ 25.5 ° and α ₅ ≈ 26.2 ° rise with the FIGS. 6 or 7 on, ie the meshing angle α ₅ according to FIG. 7 is maximum.

Furthermore, by setting the cutting plane with increasing penetration depth E, the width of the tooth flanks 16, 17 of the teeth 7, 12 increases continuously until the width of the tooth flanks 16, 17 measured in the fiber passage direction 24 FIG. 7 the width B of the comb element 6 corresponds.

The two in FIGS. 8 and 9 illustrated cross sections through the tooth roots 15 of the teeth 7, 12 show in comparison to the maximum meshing angle α ₅ reduced Kämmwinkel α ₆ ≈ 25.4 ° and α ₇ ≈ 23.0 °, where, α ₆ > α ₇ . This is essentially due to the fact that the extent of the interdental space 18 along the generating line 9 in the area of the tooth roots 15 is greater than in the tooth combing area 14 of the teeth 7, 12.

Concrete numerical values of the meshing angle α are given as a function of the penetration depth E both in absolute terms and in relation to a respective maximum penetration depth E _max for various embodiments of the comb element according to the invention in Tables 1 to 3. The relative or relative penetration depth E _rel indicates the penetration depth E in relation to the maximum penetration depth E _max , so that the following applies: E _rel = E / E _max .

As example 1 is in the FIGS. 2 to 9 named illustrated first embodiment. Ex. 2 and Ex. 3 indicate further alternative configurations of mesh angle progressions along the penetration depth E and for various interdental spaces (ZZR) 18, 19 of a comb element 6. Table 1: Penetration depth E relative penetration E _rel Ex.1 ZZR 18 Ex.1 ZZR 19 0.2 mm 13% 10.0 8.1 0.4 mm 25% 15.2 14.4 0.6 mm 38% 18.7 19.0 0.8 mm 50% 21.5 21.6 1.0 mm 63% 23.3 22.9 1.2 mm 75% 23.8 26.5 1.4 mm 88% - 26.5 1.6 mm 100% - 24.5 Penetration depth E relative penetration E _rel Example 2 ZZR 18 Example 2 ZZR 19 0.2 mm 10% 4.2 4.0 0.4 mm 20% 5.9 6.0 0.6 mm 30% 8.2 8.3 0.8 mm 40% 9.9 10.0 1.0 mm 50% 11.5 11.6 1.2 mm 60% 13.0 13.0 1.4 mm 70% 13.8 13.8 1.6 mm 80% 15.2 15.2 1.8 mm 90% 14.9 14.9 2.0 mm 100% 15.4 - Penetration depth E relative penetration E _rel Example 3 ZZR 18 Example 3 ZZR 19 0.2 mm 10% 4.3 8.9 0.4 mm 20% 7.7 17.4 0,6mm 30% 12.0 17.4 0.8 mm 40% 10.9 20.1 1,0mm 50% 12.3 22.5 1.2 mm 60% 13.7 24.6 1,4mm 70% 13.8 24.2 1,6mm 80% 14.0 24.0 1,8mm 90% 13.9 2,0mm 100% 13.9

It can be seen from the tables that the meshing angle α is opposite to the radial direction 11, i. So along the penetration depth E, at least partially increase, remain constant, or can decrease. Furthermore, the examples of the comb elements according to the invention show that the meshing angle α initially increases at least in sections in the radial direction and can subsequently decrease at least in sections.

It is also possible that the meshing angle α is designed to be consistent with a constant penetration depth E along the surface line 9. In addition, it is apparent from the examples of Tables 1 to 3, that the Kämmwinkel along the surface line 9 at a constant penetration depth E increasing is designed. The increase in the Kämmwinkels α along the generatrix 9 can also be progressive.

It has proven to be particularly advantageous if a meshing angle α of at least 15 ° is achieved starting from the relative penetration depth E _rel of at least 20%. Within a range of relative penetration depth E _rel of 25% to 45%, the meshing angle α reaches a maximum value. By designing a tooth space such that the meshing angle α decreases again from a relative penetration depth E _rel of 30%, a fiber can be held comparatively high in the respective interdental space during a combing process. Too much penetration will result in increased contamination with combed particles or fiber components down the interdental space 18 from where these contaminants are difficult to remove (eg, brush out).

Fig. 10 shows one to the FIGS. 3 to 9 similar representation of a second embodiment of a comb element 6. Components which correspond to those described above with reference to FIG FIGS. 1 to 9 have the same reference numbers and will not be discussed again in detail. Similar, but structurally differently designed elements receive the same reference numerals according to the aforementioned figures with a trailing "a".

The comb element 6a according to FIG. 10 corresponds to that according to the FIGS. 2 to 9 wherein the teeth 7a, 12a have a substantially rectangular cross section perpendicular to the radial direction 11. Unlike the teeth 7, 12 in the FIGS. 2 to 9 the tooth edges are each rounded in a region 20a to 23a. This results in a change the connecting line 25a, since the exact tooth edges according to the first embodiment of a comb element do not exist. The connecting line 25a is defined between two abutment points 26 and 27 of the fiber to be combed in the interdental space 18.

The rounding of the tooth edges is done by polishing, so that the edges of the teeth are not sharp-edged, but have radii. The individual radii in the rounded regions 20a to 23a of the teeth 7a, 12a may be different. In particular, the radii may differ on the same tooth. Compared to a comb element 6 with sharp-edged teeth 7, 12, the meshing angle α _{8 of} a comb element 6a, which has teeth 7a, 12a with rounded teeth 20a to 23a, is reduced compared to a correspondingly defined penetration depth of a combing angle α ₁ to α ₇ . That is, by the rounding of the teeth 7a, 12a of the meshing angle α _{8 is} reduced.

Fig. 11 shows one to FIG. 2 similar, enlarged detail of a comb element 6b. Components which correspond to those described above with reference to FIGS. 1 to 10 have the same reference numbers and will not be discussed again in detail. Similar, but structurally differently designed elements receive the same reference numerals according to the aforementioned figures with a trailing "b".

In the illustrated section of the comb element 6b, two adjacent teeth 7b, 12b are shown with a tooth space 18b which has an enlarged dimension along the surface line 9 in the area of the tooth roots 15. This will be at a lower end of the interdental space 18b, a retaining region 28 is formed in which a fiber to be combed is held during a combing operation. For this purpose, the retaining region 28 has a substantially circular cross-sectional shape which is open upward in the radial direction 11, so that the tooth gap 18b has a reducing width along the surface line 9 along the radial direction 11 starting from the tooth tips 13 via the tooth combing region 14. With increasing depth of penetration, in particular with reaching the retention area 28, the width of the tooth space 18b increases again, so that in the Zahnkämmbereich 14, in particular between the tooth tips 13 and the tooth roots 15, a region of minimum width of the interdental space 18b in the direction of the surface line 9 exists. With the comb element 6b, a fiber to be combed can be held during a combing process due to the reaction forces acting on the fiber in the tooth space 18b, so that the combing process is particularly stable and error-prone to perform.

Claims (13)

1. Comb element for a comb segment of a combing roller, which can be rotated about a rotational axis in a textile machine for combing cotton fibres, comprising

   a) a foot part (8) with a lateral surface (10), which is curved along a surface line (9),

   b) a plurality of teeth (7, 12; 7a, 12a; 7b; 12b) extending away from the lateral surface (10) in relation to the rotational axis (3) in the radial direction (11) and arranged one behind the other along the surface line (9) and

   c) a plurality of intermediate tooth spaces (18; 18b), which are arranged in each case between two adjacent teeth (7, 12; 7a, 12a; 7b, 12b) and in each case allow a passage of fibres to be combed in a fibre passage direction (24) with a radial penetration depth (E),
   wherein

   d) each tooth (7, 12; 7a, 12a; 7b, 12b) has four tooth edges (20, 21, 22, 23; 20a, 21a, 22a, 23a),

   e) an imaginary connecting line (25; 25a) in the intermediate tooth space (18; 18b) is established between a front tooth edge along the surface line (9) and a rear tooth edge (23; 23a) in the fibre passage direction (24) of a first tooth (7; 7a; 7b) limiting the intermediate tooth space (18; 18b) and a rear tooth edge along the surface line (9) and a front tooth edge (20; 20a) in the fibre passage direction (24) of a second tooth (12; 12a, 12b) limiting the intermediate tooth space (18; 18b),

   f) the combing angle (α) increases in the radial direction (11), at least in portions,
   characterised in that

   g) the surface line (9) and the connecting line (25) enclose a combing angle (α) of at least 15° to improve the combing effect.
2. Comb element according to claim 1, characterised by a constant combing angle (α), at least in portions, in the radial direction (11).
3. Comb element according to any one of the preceding claims, characterised by a combing angle (α), which decreases, at least in portions, in the radial direction (11).
4. Comb element according to any one of the preceding claims, characterised by a combing angle (α), which firstly increases, at least in portions, from the outside to the inside counter to the radial direction (11) and then decreases again, at least in portions.
5. Comb element according to any one of the preceding claims, characterised by a combing angle (α), which varies cyclically along the surface line (9) when the penetration depth (E) remains the same.
6. Comb element according to any one of the preceding claims, characterised by a combing angle (α), which increases along the surface line (9) when the penetration depth (E) remains the same.
7. Comb element according to any one of the preceding claims, characterised by a progressively increasing combing angle (α) along the surface line (9) when the penetration depth (E) remains the same.
8. Comb element according to any one of the preceding claims, characterised by a combing angle (α) of at least 18°, in particular at least 20°.
9. Comb element according to any one of the preceding claims, characterised by intermediate tooth spaces (18, 19) with different tooth heights (H1, H2).
10. Comb element according to any one of the preceding claims, characterised in that the combing angle (α) of at least 15° is reached at a relative penetration depth (E_rel) of at least 20% in relation to a maximum penetration depth (E_max).
11. Comb element according to any one of the preceding claims, characterised in that the combing angle (α) of at least 15° adopts a highest value in the region of a relative penetration depth (E_rel) of 25% to 45% in relation to a maximum penetration depth (E_max).
12. Comb element according to any one of the preceding claims, characterised in that the combing angle (α) of at least 15° decreases from a relative penetration depth (E_rel) of 30% in relation to a maximum penetration depth (E_max).
13. Comb element according to any one of the preceding claims, characterised by at least one rounded tooth edge (20a, 21a, 22a, 23a) of a tooth (7a, 12a), wherein the fibre to be combed rests on a contact point (26, 27) of the rounded tooth edge (20a, 21a, 22a, 23a) and the connecting line (25a) is defined on the rounded tooth edge (20a, 21a, 22a, 23a) by the contact point (26, 27).

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