Sawtooth all-steel clothing for rollers and / or drums of cards or cards

Abstract

A sawtooth all-steel clothing for rollers and / or drums of cards or cards, comprising an elongated root region (2) (root) and an adjoining tooth region (3) (blade), in which teeth are formed by recesses having a tooth face (5; 51; 52), a tooth back (6), and two side flanks (7a, 7b), wherein a tooth gap (8) is present between the tooth back (6) and the tooth face (5; 51; 52) of two teeth arranged one behind the other, and the teeth consist of at least two sections, wherein a first section (51) located at a tooth tip (9) has a positive or at least perpendicular working angle (α) (face angle), and the distance between the tooth tip (9) and the transition region between the first and second distances forms a technologically effective region, characterized in that the first section (51) of the tooth face (5) is convex in the direction of movement (A) of the clothing (1). or is approximately convex.

Description

[0001] The invention relates to a sawtooth all-steel clothing for rollers and / or drums of cards or cards with an elongated root region (root) and an adjoining tooth region (blade), in which teeth are formed by recesses which have a tooth face, a tooth back and two side flanks, in which there is a tooth gap between the tooth back and the tooth face of two teeth arranged one behind the other and the teeth consist of at least two sections, wherein a first section located at a tooth tip has a positive or at least vertical working angle (face angle) and the distance between the tooth tip and the transition region between the first and the second distance forms a technologically effective region.

[0002] The drum clothing of a carding or carding machine undergoes wear during the production process. The originally sharp tip is rounded off, and part of the front of the tooth is worn away. Wear on the front of the tooth increases progressively towards the top of the tooth, so that the angle of the front of the tooth to the vertical (face angle) becomes increasingly smaller. By resharpening the clothing, an attempt is made to restore the original

[0003] Restoring the aggressiveness of the clothing. This will, at best, only sharpen the tip of the clothing. The reduced breast angle and the rounded tooth flanks remain and lead to a progressive loss of aggressiveness, which in turn reduces the quality of the produced fiber material.

[0004] In a known set (EP 1 657 328 A2), the first section of the tooth front is straight. After regrinding, the teeth lose a significant amount of aggressiveness.

[0005] In DE 10 2006 0151278 A1, the cutting element of the tooth is soldered or welded to the base element. The tooth face has a flat surface in all designs.

[0006] A carding clothing is disclosed in US Pat. No. 3,605,197 A in which both the tooth face and the tooth back are convex. Regrinding the clothing at the tooth tip is not possible without changing the geometry.

[0007] The invention is based on the object of creating a sawtooth all-steel fitting of the type described above which avoids the disadvantages mentioned and which, in particular, retains a high level of aggressiveness over its service life.

[0008] This problem is solved by the characterizing features of claim 1.

[0009] By making the first section of the tooth front convex or nearly convex in the direction of movement of the set, the wear-related reduction in the face angle is reduced, maintained at the same level, or even increased. This can mitigate or compensate for the loss of aggressiveness caused by the non-resharpenable rounded tooth flanks and the wear-related reduction in the face angle α. The quality of the produced product is thus subject to fewer fluctuations.

[0010] This is achieved by the tooth resharpening process common with drum and card clothing. The tooth tip is ground down from the top until a sharp working edge is again formed at the tip. Due to the height reduction during each grinding of the clothing, the resulting tooth tip moves a little further down the front of the tooth each time. In the invention, this essentially leads to an increase in the face angle due to the special tooth shape. The wear-related reduction in the face angle common with drum and card clothing is thus reduced or even eliminated.

[0011] Claims 2 to 9 contain advantageous developments of the invention.

[0012] The invention is explained in more detail below with reference to exemplary embodiments shown in the drawings.

[0013] It shows: Fig. 1a, Fig. 1b schematic side view ( Fig.1a) and sectional view ( Fig. 1b) the sawtooth all-steel clothing according to the invention, Fig. 2a Partial view of a tooth face with a first, convexly curved section and part of a second section in new condition and Fig. 2b Partial view of the tooth after Fig. 2a with first, convexly curved section and part of the second section after resharpening.

[0014] The Fig. 1a, Fig. 1b show a side view and a section, respectively, of the sawtooth wire 1 according to the invention, which consists of a single piece comprising an elongated base region (base 2) and an adjoining blade region (blade 3). In blade 3, teeth 4 are formed by recesses that define a tooth face 5, a tooth back 6, and two side flanks 7a, 7b (see Fig. Fig.1b). Between the tooth back 6 and the tooth face 5 of two teeth 4 arranged one behind the other there is a tooth gap 8. The teeth 4 or the tooth face 5 consists of two sections, wherein a first section 51 located at a tooth tip 9 has a positive working angle α. The working angle α (face angle) is the angle between the tangent to the convexly curved first section 51 at the tooth tip 9 and the vertical axis to the wire base (lower surface of the tooth root 2). The distance between the tooth tip 9 and the transition area between the first section 51 and the second section 52 of the tooth face 5 (tooth front) forms a technologically effective area. The first section 51 of the tooth face 5 is convexly curved in the direction of movement A of the set 1. The second section 52 of the tooth face is concavely curved.

[0015] In Fig. 1b are designated: symbol designation definition h1 Total height of the wire Distance from the base to the wire tip h2 Foot height Height of the foot measured from the base b1 Foot width Width of the foot at the wire base b2 Blade width at the base Width of the blade, measured at the foot b3 Blade width at the tip Width of the blade, measured at the tip

[0016] H3 denotes the blade height, which results from the difference between h1 and h2. B4 denotes the blade width at the point of the deepest tooth gap.

[0017] Fig. 2a shows a partial view of a tooth face 5 with a first, convexly curved section 51 and part of a second section 52 in the new state.

[0018] The clothing 1 of the carding machine is subject to a certain amount of wear during the production process. The originally sharp point 9 ( Fig. 1a) is rounded off, the tooth flanks 7a, 7b are rounded, and part of the front side of the tooth is gradually worn away. Wear on the front side of the tooth 5 increases progressively towards the top, toward the tooth tip 9, causing the face angle a to steadily decrease over the entire service life of a set 1.

[0019] By resharpening the set 1 according to the invention, the original aggressiveness of the set 1 is restored. Fig. 2b is the original contour according to Fig. 2 is shown with a dotted line and the contour of the reground set with a solid line. The working angle α1 corresponding Fig. 2a is smaller than the working angle α2 according to Fig. 2b.

[0020] In Fig. 2a, R denotes the radius of curvature of the first section 51.

Claims

[1] A sawtooth all-steel clothing for rollers and / or drums of cards or cards, comprising an elongated root region (2) (root) and an adjoining tooth region (3) (blade), in which teeth are formed by recesses having a tooth face (5; 51; 52), a tooth back (6) and two side flanks (7a, 7b), in which a tooth gap (8) is present between the tooth back (6) and the tooth face (5; 51; 52) of two teeth arranged one behind the other, and the teeth consist of at least two sections, wherein a first section (51) located at a tooth tip (9) has a positive or at least vertical working angle (α) (face angle), and the distance between the tooth tip (9) and the transition region between the first and second distances forms a technologically effective region, characterized by that the first section (51) of the tooth face (5) is convex or approximately convex in the direction of movement (A) of the set (1). [2] Sawtooth all-steel clothing according to claim 1, characterized by that the second section (52) of the tooth front is concave or approximately concave in the direction of movement (A) of the set. [3] Sawtooth all-steel clothing according to claim 1 or 2, characterized by that the first section (51) is arc-shaped. [4] Sawtooth all-steel clothing according to one of claims 1 to 3, characterized by that the first section (51) merges into the second section (52). [5] Sawtooth all-steel clothing according to one of claims 1 to 4, characterized by that the wear-related reduction of the working angle (a) (breast angle) is reduced. [6] Sawtooth all-steel clothing according to one of claims 1 to 4, characterized by that the wear-related reduction of the working angle (α) (breast angle) remains the same. [7] Sawtooth all-steel clothing according to one of claims 1 to 4, characterized bythat the wear-related reduction of the working angle (α) (breast angle) becomes greater. [8] Sawtooth all-steel clothing according to one of claims 1 to 4, characterized by that the reduction or increase or maintenance of the working angle (α) (breast angle) occurs after resharpening the set. [9] Carder or carding machine, characterized by that the sawtooth set attached to a roller or drum is designed according to one of the preceding claims.

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