DE7300667U - NEEDLE FOR CREATING NEEDLE FELT - Google Patents

Description

PAT " ⁷ NTANWALTE

HELMUT SCHROETER KLAUS LEHMANN

Dl PL.- PH YS. DIPL-INC.

Utility model application G 73 00 667. ^ ir-gate-15

THE TORRINGTON COMPANY L / Bi.

April 6, 1976

Felting needle

The invention relates to a felting needle according to the preamble of claim 1, which is used to manufacture Needle felt is used. In particular, the invention relates to a novel design of the barbs formed on such felting needles, which are designed according to the invention so that the strength of the needles is increased and that they can be kept in a usable state at a lower cost.

In the manufacture of needle felt, needles provided with downward barbs are inserted through a tangle of fibers Existing mat pressed so that the needles pull fibers from the mat through a base or support material. Will the needles are then withdrawn, they give the grasped by them. Fibers free, so that these fibers remain in the carrier fabric, and this work cycle is carried out until completion of the felt repeat * :. The shaft of such a felting needle usually has a triangular cross-section, and the barbs are created by thrusting a chisel into the apex of the shank. Flat when used Chisels created barbs with straight edges that tended to cut through the fibers to be matted. Here-

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This not only caused loss of fiber material, but also made it impossible to produce a high quality felt. These difficulties could be avoided, viev.p. the needles were provided with grooves in which both wall surfaces were rounded. However, if the grooves were to hold a certain amount of fiber each, they had to be cut deeper into the needles; this led to a weakening of the needles, and the production of grooves with rounded wall surfaces required tools with recesses aligned with one another, so that the tools were both high acquisition costs and high maintenance costs.

The invention is based on the object of creating a felting needle in which the disadvantages mentioned are avoided which on the one hand avoids cutting through the fibers, but on the other hand no animal cuts required for the grooves, so that the strength of the needle is improved will. Finally, the third requirement to be taken into account is the desire for low manufacturing and maintenance costs.

The needle according to the invention is characterized in claim 1. The subclaims characterize advantageous developments.

Since it was recognized that the to be applied to the detected fibers Tensile force is generated exclusively by the inner surface of the barb, is to solve the problem mentioned by the Invention a needle has been created in which the inner surface of the barb is convexly rounded, while that of this surface opposite bottom surface of the groove has a flat shape. This gives the needle a higher strength, and it lets you see Achieve savings in the cost of tool manufacture and maintenance.

■ · - ·! Λ * "cη f 07.10.76

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An embodiment of the invention is given below: Drawing described «n. It shows:

1 shows part of a side view of a felting needle with a barb;

Fig. 2 is a cross section through the barb along the Line 2-2 in Figure 1;

3 shows, in a partial section, a tool for training i: ines Barb on a felting needle;

H shows part of the end face of the tool according to Vif .. 3;

Fig. 5 and 6 each in a partial section · further execution. :: - forming a tool d-: - of the type shown in Fig. 3; and

7 shows the relative position of two tools during ream lapping the "rounded surface" shown in FIG. 3.

The felting needle 10 shown in Fig. 1 has a barb and has a groove I ¹ J which is delimited by an electrode surface Io and the inner surface 18 of the barb. The cross-section shown in Fig. 2, running through the barb shows that the bottom surface 16 of the groove is flat, while the opposite inner surface of the barb is rounded. In the needle according to the invention, the depth 20 of the groove does not need to be as great as in the needles known up to now, in which the two mutually facing surfaces are rounded to enable the groove to receive the same amount of fiber, and in addition, the Strength of the needle

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shaft'. ¹ S. ": r, to prevent fibers from being wedged in the groove, there is the Uborgangsabschnitt-1 22 between the two surfaces ^ o shtrfipundet. El a fs an uiuaer Steile uino korikave Fl ^H .r> y-! O that works with the fibers.

To dd. To produce barbs 12, a chisel-shaped W'-rKz -. 'Ug 2 ¹ ^ is pressed obliquely into the shaft of the needle. ~! '. ¹ TrI ¹ IIi Fig. 3 and '! For example, a recess 2b is ground into the front side 28 of the tool, which recess serves to determine the shape of the curved inner surface 18 of the barb 12. The recess ? .C merges into the end face 30 of the tool: lai.iT "in a curvature 32, the course of which determines the shape: r, the transition section 22 of the!," Ut l'i to be formed on the needle 3, 5 and tangential to the bottom of the recess 2i b: w, tangential both to the [iod cn of the recess air, also to the end face 30 of the tool or only tangential to the end face 30. If the tool has worn out, it is possible in a simple manner to grind the tool according to FIG the curvature is tangential to the recess 26 and at right angles to the end face 30 as shown in FIG the lapping tool on the bottom surfaces of the two recesses 26 can attack. These in F: g. The possibility shown in FIG. 7 results in savings both in the manufacture and in the maintenance of the tools.

Claims (1)

- 5 - ir-gate-15 PROTECTION CLAIMS 1. Felting needle with a shaft which has at least one barb, which is opposite the shaft of the needle under a Projecting angle to the longitudinal axis of the needle and a groove between the barb, which is used to grasp fibers and delimits the needle shaft, the surface of the groove formed on the needle shaft as the bottom surface and that of this Surface opposite surface can be referred to as the inner surface of the barb and these surfaces at least are partially rounded, characterized in that only the inner surface (18) of the barb (12} a convex surface, the bottom surface (16) of the groove (1 * 0 but is a flat surface. 2. Felting needle according to claim 1, characterized in that that the transition section. -wipe the floor area (16) of the groove (14) and the inner surface (18) of the barb (12) is a concavely curved surface (22). 3. Felting needle according to claim 2j, characterized in that that the concave curved surface (22) is tangent to the bottom surface (16) and the inner surface (18) of the barb (12). i ». Felting needle according to Claim 2, characterized in that the concavely curved surface (22) is tangent to the inner surface (18) of the barb (12) and runs at right angles to the bottom surface (IC) of the groove (Ik) . ^ Π Π R R 9 0 10/7/76 - 6 - ir-tor-15 5. Felting needle according to Claim 2, characterized in that that the concave curved surface (22) is tangent to the bottom surface (16) of the groove (14) and at right angles to the inner surface (18) of the barb (12) runs. '/. '! Π 7p