Leno selvedge device for forming a leno selvedge

Abstract

The subject matter of the invention relates to a leno selvedge device (1) for forming a leno selvedge with two mutually opposite lifting healds (10) which can be arranged on two alternately moved heald frames of a weaving machine, and wherein the lifting healds (10) have a foot (11) for connecting to in each case one heald carrying rail, wherein a half-heald (12) made of a metal flat material is received between the lifting healds (10), which half-heald has two limbs (13) which are connected to one another via a half-heald head (14), and wherein a respective stopper (15) is received on the limbs (13) of the half-heald (12) in order to hit the foot (11) of the half-heald during a lifting movement of the lifting healds (10), wherein a recess (16) is introduced in the limb, the stopper (15) being inserted in said recess. According to the invention, the recess (16) in the limb (13) has a contour which forms at least one retaining geometry (17) for retaining the stopper (15).

Description

[0001] TURNING EDGE DEVICE FOR

[0002] FORMING A TURNTABLE EDGE

[0003] The invention relates to a heddle edge forming device for creating a heddle edge with two opposing lever strands arranged on two reciprocally movable heddles of a weaving machine. Each lever strand has a foot for attachment to the strand support rails, and a half-strand made of a flat metallic material is held between the two lever strands performing the opposing lifting movement. The half-strand has two legs connected to each other via a half-strand head, and a stopper is held on each leg of the half-strand to abut against the foot of the lever strand during its lifting movement. A recess is provided in the leg in which the stopper is inserted. (PRINCIPAL DETAILS)

[0004] Heddle edge devices are used to form a heddle edge and essentially consist of two lever strands arranged on two alternately moving heddles of a weaving machine. Heddle guide rails serve to hold the lever strands. A heddle edge device forms a heddle edge, for which a half-strand is arranged between the two lever strands. This half-strand is alternately driven by the lever strands according to the stroke of the heddles. The half-strand is essentially composed of two legs that converge at their upper end to form a half-strand head with an eyelet for guiding the so-called stand-off thread. Such a half-strand is usually made of a metallic sheet material, for example, by a laser cutting or stamping process.Each lever strand has a magnet at its lower end, which causes a controlled carriage of the half-strand by the respective lever strand in such a way that the magnetic force ensures that the half-strand is held by the lever strand during the respective carriage movement.

[0005] This principle is known, for example, from EP 0 916 758 B1 or from DE 38 18 680 C1. The half-strand is carried along by the lever strand and, in particular, by a ridge arranged in the lever strand, on which the half-strand rests with its end head during being carried along by the respective lever strand.

[0006] A first thread is guided through the eyelet in the heddle head, while a second thread alternately wraps around the first thread on the left or right. This principle allows the edge threads to be twisted together during the production of a woven fabric. On weaving machines, up to 1,200 picks per minute can be achieved, which quickly leads to the heddle cutting into the bar. Wear and tear is particularly noticeable when the heddle, with its periodic stroke, strikes the bar with greater force. To prevent such cutting, it is known to attach a stopper to the underside of the heddle legs. A recess is provided in the leg for the stopper, which is made of plastic, and into which it can be inserted.Due to the dynamic movement of the half-strand and the periodic impact of the half-strand on the associated stops on the lever strands, a reliable function of the stoppers is only guaranteed if they are also securely arranged in the recess in the leg of the half-strand.

[0007] REVELATION OF THE INVENTION

[0008] The object of the invention is to further improve a turning edge device, which in particular enables longer service life and experiences less wear.

[0009] This problem is solved starting from a turning edge device according to the preamble of claim 1 in conjunction with the characterizing features. Advantageous embodiments of the invention are specified in the dependent claims.

[0010] The invention includes the technical teaching that the recess in the leg has a contour which forms at least one holding geometry for the holding reception of the stopper.

[0011] The basic idea of ​​the invention is to extend the recess in the leg with a contour comprising a retaining geometry to prevent the stopper from being lost from the recess. The retaining geometry particularly features a form-fitting contour in the recess, by which the stopper, made of a plastic material, is held securely in the recess and thus on the leg of the half-strand.

[0012] The recess has a particularly advantageous LI shape, comprising two opposing retaining edges and a base edge. In other words, the recess forms a rectangular indentation in the outer contour of the leg of the half-strand, into which the stopper is inserted. Since the stopper is made of a flexible plastic material, the interlocking effect can be overcome by its flexibility, for example, by a portion of the stopper snapping into an undercut in the retaining edge after elastic deformation. The retaining geometry can be created, for instance, by incorporating undercuts in both retaining edges, which can be, for example, tooth-shaped or hook-shaped. The undercut can, for example, point towards the base edge like a sawtooth contour, so that once the stopper is pressed into the recess, it cannot be accidentally dislodged.In particular, the at least one undercut or the plurality of undercuts can preferably be incorporated into both opposing retaining edges of the U-shaped recess. The undercut can form a notch in the retaining edge, shaped like a barb, with an effective direction pointing towards the base edge of the recess and holding the stopper in the recess. Especially when the stopper regularly strikes the stop at the base of the lever strand due to the lifting movement of the lever strands and also the half-strand itself, a positive locking geometry is formed in the contact edge on the stopper. This can be achieved with either a notch in the retaining edge or a tooth- or wedge-shaped feature on the retaining edge.

[0013] It is also possible to provide that retaining lugs are molded onto the stopper itself, which are designed to complement the notches present in the retaining edge. This allows the retaining lugs to snap into the notch when the stopper is inserted into the recess.

[0014] The recess can be symmetrically designed, such that it has a mirror-image contour on both sides of a line of symmetry. In particular, the two retaining edges on both sides of the line of symmetry can be identical to each other, thus extending and contouring in a mirror image of the line of symmetry. The line of symmetry represents the joining axis from which the stopper is inserted into the recess and secured therein. In general, the invention is based on the fundamental principle of designing the retaining geometry in such a way that the stopper can rust or become embedded in the recess, thereby being held in place by the rust itself.

[0015] It is also conceivable that the two opposing retaining edges are formed at an angle to each other and diverge towards the base edge. In this way, the retaining edges themselves can form the undercut geometry, so that once a stopper is pressed into the recess, it is self-retaining and secured with a geometric interlock. Indentations or tooth-like projections on the retaining edges can also be provided. Thus, the undercut geometry can generate a macroscopic retaining effect via the beveled retaining edges, and indentations or projections in or on the retaining edges can superimpose microscopic retaining elements, so that the stopper is held in the recess based on multiple retaining effects.

[0016] Alternatively, the two opposing retaining edges can be designed to converge at an angle to the base edge. This creates the effect of the recess being wedge-shaped over the angled retaining edge, allowing the stopper to be pressed into this wedge-shaped geometry. During operation of the rotary edge device, the stopper is progressively pressed further into the wedge-shaped recess by repeatedly striking the stop at the base of the lever, thus achieving a clamping effect. In addition to this design of the retaining edges relative to each other, notches can be incorporated into or contours formed on the retaining edge to create a positive locking mechanism via the retaining edge itself.

[0017] The stopper can also have lateral slots into which the retaining edges are inserted according to a tongue-and-groove arrangement. It is also conceivable that the stopper has an oversize relative to the recess, in particular so that the stopper is pressed into the recess with a slight joining force. It is advantageous if the stopper is made of a plastic material, for example, a polyamide.

[0018] The legs of the half-strand can extend along a lifting axis, with the line of symmetry of the recess running at an angle to the lifting axis of 20° to 60°, preferably 30° to 50°, and particularly preferably 40°. The stop on the upper side of the foot of the lifting strand can be slightly chamfered to prevent the accumulation of lint. In particular, the chamfered arrangement of the stop over the line of symmetry, which is set at an angle to the lifting axis and thus forms the mounting axis of the stop, ensures that contaminants, especially lint, do not accumulate in the groove of the stop on the upper side of the foot of the lifting strand.

[0019] PREFERRED EXAMPLES OF THE INVENTION

[0020] Further measures improving the invention are described in more detail below, together with a description of a preferred embodiment of the invention, with reference to the figures. The figures show:

[0021] Figure 1 shows a lathe edge device with two lever strands and a half-strand arranged between the two lever strands.

[0022] Figure 2 shows the rotary edge device according to Figure 1 in an exploded view,

[0023] Figure 3 shows a detailed view of the arrangement of the stoppers at the lower ends of the legs of the half-strand as well as the two lever strands, with the left lever strand in an upper and the right lever strand in a lower lifting position.

[0024] Figure 4 shows a first embodiment of the holding geometry based on notches in the holding edge,

[0025] Figure 5 shows another embodiment of the holding geometry with holding projections at the end of the holding edges,

[0026] Figure 6 shows an embodiment with retaining edges that run diagonally to each other and diverge towards the base edge of the recess; Figure 7 shows an embodiment with retaining edges that run diagonally to each other and converge towards the base edge of the recess; and

[0027] Figure 8 shows a cross-sectional view of the stopper arranged in the recess on the half-strand.

[0028] Figure 1 shows a twist-edge device 1 in an assembled state with the threads 26 and 27, while Figure 2 shows the twist-edge device 1 in an exploded view without the threads, with Figures 1 and 2 being described together below. In Figure 1, the first thread 26 is shown passing through an eyelet in the half-strand head 14 and forming the so-called stand thread, while the second thread 27 runs along the half-strand 12 as the twist thread.

[0029] The turning edge device 1 has two opposing lever strands 10, which can be arranged, in a manner not shown in detail, on two weaving shafts of a weaving machine that alternately perform a lifting movement. The lever strands 10 have a foot 11 for connection to a strand support rail, and between the two lever strands is a half strand 12 made of a flat metallic material. The lever strands themselves, however, can be a combination of a flat metallic material and an injection-molded plastic material.

[0030] The half-strand consists of two parallel legs 13, which are connected to each other at the top via the half-strand head 14. A stopper 15 is located on the underside of each leg 13 of the half-strand 12. During the lifting movement of the lever strands 10, these stops abut a foot 11, which connects the lever strands 10 to the underside. Stops 28 are located on the upper sides of the feet 11 of the lever strands 10. The stoppers 15 on the underside of the legs 13 alternately press against these stops when the periodic lifting movement of the two lever strands 10 is performed. In this way, the half-strand 12 is also alternately lifted along with the lifting movement of the lever strand 10.

[0031] Figure 3 shows in detail the lower ends of the two legs 13 of the half-strand 12, also showing the lever strands 10. The left lever strand 10 is in an upper lifting position, while the right lever strand 10 is shown in a lower lifting position. The lifting movement can occur along a lifting axis 24, which is indicated for both lever strands 10.

[0032] At the lower end of the legs 13 are the two stoppers 15. Only on the first, left-hand lever 10 is the stopper 15 shown in its arrangement, while on the right leg 13 a recess 16 is shown into which no stopper 15 is inserted. The left stopper 15 rests against the stop 28 of the foot 11 of the lever 10, with the symmetry line 23 of the recess 16 shown on the right side. The contour of the recess is identical on both sides of the symmetry line 23.

[0033] The recess 16 has two opposing retaining edges 18 and a base edge 19, so that the recess 16 is essentially U-shaped. The line of symmetry 23, and thus also the course of the recess 16, is inclined to the lifting axis 24, for example at an angle of 40°. Figure 4 now shows a detailed view of the recess 16 with an exemplary retaining geometry 17. The retaining geometry 17 is formed by opposing indentations 21 in the retaining edges 18 of the recess 16, each forming undercuts 20. Retaining lugs 22 are formed on the stopper 15, and when the stopper 15 is pressed into the recess 16, the retaining lugs 22 on the stopper 15 engage in the indentations 21 of the recess 16. This allows the stopper 15 to be securely attached to the leg 13.

[0034] Figure 5 shows an alternative embodiment for the self-retaining arrangement of the stopper 15 in the recess 16, wherein the recess 16 has opposing retaining projections 29 at the transition to the outer contour of the leg 13, which also each form undercuts 20. When the stopper 15 is pressed into the recess 16, the retaining projections 29 ensure that the stopper 15 cannot fall out of the recess 16, i.e., it is self-retainingly held in the recess 16.

[0035] Figure 6 shows an embodiment in which the two retaining edges 18 of the recess 16 on the leg 13 are chamfered at an angle to each other, so that the opposing retaining edges 18 diverge towards the base edge 19 of the recess 16. When the stopper 15 is pressed into the recess 16, an elastic deformation of the stopper 15 must be overcome, particularly if the opening of the recess 16 is narrower than the receiving width of the stopper 15.

[0036] Figure 7 shows an alternative embodiment with chamfered retaining edges 18, contoured such that they converge towards the base edge 19 of the recess 16. According to this retaining geometry 17, a wedge effect is utilized, so that during operation of the rotary edge device and through the regular impact of the stopper 15 against the stop at the base of the lever pulley, the stopper 15 is pressed into the wedge-shaped recess and held by it. This requires elastic deformation of the stopper 15, whereby, in a manner not shown in detail, a notch 21 with associated retaining lugs 22 according to the embodiment in Figure 4 or with the retaining projections 29 according to the embodiment in Figure 5 can also be combined with the geometric design of the retaining edges 18 of the recess 16 according to Figure 7.

[0037] Finally, Figure 8 shows once again the cross-section of the stopper 15, comprising two slots 25 into which the flat material of the half-strand 12 is inserted, similar to a tongue-and-groove connection.

[0038] The invention is not limited in its implementation to the preferred embodiment described above. Rather, a number of variants are conceivable, which utilize the solution presented even in fundamentally different designs. All features and / or advantages arising from the claims, the description, or the drawings, including design details or spatial arrangements, can be essential to the invention, both individually and in various combinations.

[0039] Reference symbol list:

[0040] I Turning edge device

[0041] 10 lever strands

[0042] II foot

[0043] 12 half-strands

[0044] 13 thighs

[0045] 14 half-strand head

[0046] 15 stoppers

[0047] 16 recess

[0048] 17 Holding geometry

[0049] 18 Holding edge

[0050] 19 Base edge

[0051] 20 Undercut

[0052] 21 notch

[0053] 22 Retaining nose

[0054] 23 Line of symmetry

[0055] 24 lifting axle

[0056] 25 slots

[0057] 26 first thread

[0058] 27 second thread

[0059] 28 stops

[0060] 29 Holding lead

Claims

Claims:

1. Turning edge device (1) for forming a turning edge with two opposing lever strands (10) which can be arranged on two alternately moving heddles of a weaving machine, wherein the lever strands (10) have a foot (11) for connection to a strand support rail, wherein a half strand (12) made of a flat metallic material is received between the lever strands (10), the half strand having two legs (13) which are connected to each other via a half strand head (14), and wherein a respective stopper (15) is received on the legs (13) of the half strand (12) in order to abut against its foot (11) during the lifting movement of the lever strands (10), wherein a recess (16) is provided in the leg (13) in which the stopper (15) is inserted, characterized in that the recess (16) in the leg (13) has a contour which has at least one The holding geometry (17) forms the holding mount for the stopper (15).

2. Turning edge device (1) according to claim 1 , characterized in that the recess (16) has an LI shape, comprising two opposing retaining edges (18) and a base edge (19).

3. Turning edge device (1) according to claim 1 or 2, characterized in that the holding geometry (17) has at least one undercut (20).

4. Turning edge device (1) according to one of claims 1 to 3, characterized by the fact that at least one undercut (20) is provided in the opposing retaining edges (18) of the U-shaped recess.

5. Turning edge device (1) according to one of the preceding claims, characterized in that the undercut (20) is designed as a notch (21) or as a retaining projection (29) in the retaining edge (18).

6. Turning edge device (1) according to one of the preceding claims, characterized in that the stopper (15) has at least one retaining lug (22) which is designed to be complementary to the notch (21) and engages in the notch (21) when the stopper (15) is inserted into the recess (16).

7. Turning edge device (1) according to one of the preceding claims, characterized in that the recess (16) has a line of symmetry (23) to which the opposing retaining edges (18) extend in a mirror image on both sides and along which the stopper (15) is inserted into the recess (16).

8. Turning edge device (1) according to one of the preceding claims, characterized in that the two opposing holding edges (18) extend away from each other at an angle to the base edge (19).

9. Turning edge device (1) according to one of claims 1 to 7, characterized in that the two opposing holding edges (18) run towards each other at an angle to each other towards the base edge (19).

10. Turning edge device (1) according to one of the preceding claims, characterized in that the stopper (15) has lateral slots (25) into which the retaining edges (18) are inserted according to a tongue and groove arrangement.

11. Turning edge device (1) according to one of the preceding claims, characterized in that the stopper (15) has an excess relative to the recess (16) and / or is pressed into the recess (16) and / or comprises a polyamide.

12. Turning edge device (1) according to one of the preceding claims, wherein the legs (13) of the half-strand (12) extend along a lifting axis (24), wherein the line of symmetry (23) of the recess (16) runs at an angle to the lifting axis (24) of 20° to 60° and / or of 30° to 50° and / or of 40°.

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