EP2166139A1 - Jacquard braiding with embossed fibre eye area - Google Patents

Abstract

The Jacquard braid (1) has a braid body made of a round material, which has a shaft (20) with a flat section (9). The shaft is provided with an expanded opening (16) limited by two brackets (14,15). A surface area of a round cross-section of the shaft is matched with the sum of another surface area of the cross sections of the brackets. The round material of a round wire is made of metal or plastic.

Description

The invention relates to a jacquard strand for use in Jacquard machines.

Jacquard strands are for example according to GB 807945 made by first soldering two adjacent wires together. The brazed wires are then separated again in one area and bent slightly apart. In the resulting opening then a Fadenaugeinsatz (Maillon) is soldered, which forms the thread eye.

A similar approach is from the EP 1 015 675 B1 known. Again, it is assumed that two wires, which are firmly connected by tinning and nickel plating. In one area, the wires are released from each other and bent away from each other to insert a thread eye liner. This is then secured by adhesive between the wires.

Although this measure avoids the need for soldering thread eyelets, it still requires the prior manufacture of the twin wire.

To avoid this disadvantage, for example, in the EP 1 252 944 proposed to use a profiled wire with an approximately eight-shaped cross-section as the starting material instead of the twin wire. Such profiled wires are not commercially available.

From the much older US 569,149 A the production of healds of round wire is known, wherein for the preparation of the thread eye, a middle region is converted by plastic deformation in a flat shape. In this area, a thread eye is then punched. This procedure leads to a significant weakening of the tensile strength of the heald on the thread eye.

Remedy creates the DE 121 105 , which emanates from the production of the heald from a relatively thick wire. While a central portion of the wire initially remains undeformed, the two axially adjacent portions are axially stretched so that their diameter decreases. The remaining thick central area is then flattened to a thickness corresponding to the diameter of the stretched areas. In the resulting oval flattened area is then in turn punched an oval opening into which a Fadenaugeinsatz can be used.

This procedure is complicated. The stretching of the wire is not very suitable for mass production.

Another approach is the EP 0 947 620 refer to. There it is proposed to start from a band into which a narrow opening is inserted and then widened in order to attach a thread eye insert. Because thread eye inserts have a thickness from about 0.35 mm, such a strand has a relatively large band cross-section. As a result, the strand becomes relatively heavy, which is undesirable in view of the spring-controlled strand movements.

The EP 1 767 676 deals in a way supplementary to the aforementioned document with the improvement of the attachment option for the Fadenaugeinsatz.

Instead of a flat band beats the DE 195 09 03 to use a round wire as a starting material, which is rolled flat in a first manufacturing step. This results in rounded side edges in addition to the two flat sides produced by the rollers. Longitudinal notches are then imprinted into the flat sides of the flattened wire where the strand can be easily split to provide a threading insert.

A slightly different way suggests the JPS 57-117646. The strand shown there is based on a round wire on which a flattened area is attached. In these an opening is punched, which is bounded by two remaining flat legs. The opening is narrower than a thread eye to be inserted. In order to achieve the required width, the remaining legs are wound in the longitudinal direction, so that they are inclined in cross section to the thread eye. The resulting asymmetry of the shape is disadvantageous during weaving, but in particular with regard to the passage of the threads running alongside the strand.

It is an object of the present invention to provide a jacquard strand, which without compromise the quality can be inexpensively finished. The above disadvantages should be avoided as much as possible.

This object is achieved with the Jacquardlitze according to claim 1:

The jacquard strand according to the invention has a strand body which consists of a round material. This is provided with a flattened portion having a widened bounded by two legs opening. The two legs have a common cross-sectional area, which coincides with the cross-sectional area of the round Litzenkörpers. The tensile strength of the strand is thus approximately the same in the flattened section and in the region of the eye as in the regions spaced from the eye. In addition, round wire can be used as the starting material for the production of the strand, which is available as a semi-finished product at low cost. Hard-to-control and thus quality defects causing manufacturing steps, such as local stretching of the wire are avoided. In addition, the (round wire) strand is narrow, so that it is hardly worn by the running through between the strands warp threads. The service life is correspondingly high. The jacquard strand change associated with high personnel expenditure can be reduced to a minimum.

The narrow width of the jacquard strand according to the invention in comparison with flat strip strands or double stranded strands also allows the production of comparatively dense jacquard fabrics.

The jacquard strand according to the invention is preferably symmetrical with respect to a median plane on which the opening direction of the thread eye is perpendicular. Front and back of Jacquardweblitze are equal in particular to the.Fadenauge. This protects the warp threads.

In addition, the strands according to the invention can be optimized in terms of their weight. Because of the material cross section which is largely constant along the longitudinal direction and the resulting constant tensile strength, the heddle can be produced over its entire length with minimal use of material. This is advantageous in view of the conditions encountered in jacquard machines. As a rule, jacquard machines have a negative shedding. This means that the strands are held in the lower position with springs or weights and are brought into the upper compartment position only by the tensile force of the respective harness cord. The lighter the strands, the lower the required force. Correspondingly lower, the counterforce can also fail, i. the lighter or weaker the weights or springs that pull the strands down can fail. As a result, the energy consumption of a jacquard machine can be reduced.

The strand of the invention causes in their production no or only a very minimal material waste, which is particularly important when using high-quality steels or stainless steels and stainless steels. The cross sections of the legs enclosing the opening are produced by plastic deformation without (significant) material removal from the cross section of the starting material.

The strand of the invention can be produced from a round wire, i. Made of metal. But it can also be made of a plastic material, such as a carbon fiber or glass fiber composite. Also in the plastic variant, the sum of the area contents of the leg cross sections coincides with the area of the round cross section. Depending on the manufacturing method, the sum of the surface areas of the leg cross sections may differ slightly from the surface area of the round cross section. Thus, it is possible that in the mechanical production of the leg cross-sections, a material flow takes place in the longitudinal direction of the strand according to the invention, which can slightly influence the cross-sectional ratios. The two legs then have a common cross-sectional area, which still largely coincides with the cross-sectional area of the round strand body.

In the limited by the two legs opening a Fadenaugeinsatz is preferably held. This can preferably be glued. It is also possible to fix it by means of a solder or a weld. Preferably, the Fadenaugeinsatz on its outer periphery on a circumferential groove. The legs of the strand bent away from each other nestle into this channel and hold the thread eye insert. If the outer contour of the Fadenaugeinsatzes optimally adapted to the cross section of the legs, ie they are congruent to each other, can be dispensed with attachment of the Fadenaugeinsatzes eg by soldering or gluing, as between the outer contour of the Fadenaugeinsatzes and the legs creates a positive connection.

When using a thin round-sectioned round wire to make the strand, the wire cross-section is preferably determined by starting from the thread-threading insert to be used in the size. From the thickness of the Fadenaugeinsatzes arise the cross sections of the two wire-shaped legs, which engage in the outside of the thread eye insert gutter. The sum of these two substantially round leg cross-sections, which usually have a diameter of 0.3 to 0.4 mm, gives the wire cross-section of then, for example, 0.42 mm to 0.57 mm. Preferably, a wire diameter of 0.5 mm is used because the legs are then given a diameter of about 0.35 mm. This corresponds to the dimensions that are suitable for the most commonly used Fadenaugeinsätze today.

The strand according to the invention is produced, for example, by embossing, by producing a flattened region on a round wire which has a longitudinal groove on both flat sides. Preferably, the two longitudinal grooves have a matching shape. As a result, an octagonal cross-section has been formed on the round wire at the relevant point. Here, two legs can be separated and pulled apart. The result is an opening into which a Fadenaugeinsatz can be inserted. The two separate legs then have an at least nearly round cross-section, wherein the cross-sectional ratios according to the invention are maintained. The shape achieved in this way fulfills all requirements with regard to thread-friendliness with regard to the threads running past the outside of the strand. At the same time, the attachment of the Fadenaugeinsatzes is easy, because the cross sections of the legs fit into the outer groove or gutter of Fadenaugeinsatzes.

While the outer shape of the two legs is preferably round, they may have on the mutually facing flanks a protruding into the opening rib, which engages particularly well in the groove of the Fadenaugeinsatzes so that it is held securely.

When separating the legs tears a thin existing between the legs web, wherein the crack runs in the longitudinal direction of the strand. At the ends of the grooves or near the ends transverse bores can be attached, which serve as a crack stopper when separating the legs.

By attaching the Fadenaugeinsatzes in bonding technology, it is possible to use as starting material for the strand a difficult or non-solderable material, such as stainless steel. In addition, adhesive as a fastening material contributes less to the strand weight than a corresponding solder.

Preferably, the transition between the flat cross section and the circular cross section is achieved by a stepless transition zone in which the individual cross sections change continuously along the axial direction of the heddle. Any abrupt or step-like cross-sectional changes are preferably avoided.

In a preferred embodiment of the jacquard weave, the heddle body is provided with an eyelet at only one of its two ends, while an anchoring element for fastening a spring, for example a helical tension spring, is preferably provided at the other end is. The eyelet is preferably formed by a hairpin-like wire loop in which a wire section is welded to the strand body through one or more welds, joined by a weld, or otherwise secured thereto. Preferably, in the connection region, for example between weld points, a portion of a wire leg and a portion of a strand body are adjacent to each other in parallel.

The anchoring element for the tension spring is preferably a plastic part, which can be secured on a correspondingly profiled, for example by bending corrugated end of the heddle body material and form-fitting manner. The anchoring element has, for example, a threaded pin whose thread is suitable for receiving turns of a helical spring.

• Figur 1 eine erfindungsgemäße Jacquardweblitze in grober Übersichtsdarstellung,
• Figur 2 die Jacquardweblitze nach Figur 1, in ausschnittsweiser perspektivischer Darstellung,
• Figur 3 bis 7 Querschnitte der Jacquardweblitze nach Figur 2, an verschiedenen Stellen,
• Figur 8 die Jacquardweblitze nach Figur 2, in Seitenansicht und
• Figur 9 die Jacquardweblitze nach Figur 2, in Vorderansicht,
• Figur 10 und 11 weitere Ausführungsformen der erfindungsgemäßen Weblitze, jeweils in perspektivischer Schnittdarstellung, und
• Figur 12 eine bevorzugte Ausführungsform der erfindungsgemäßen Jacquardweblitze.

Further details of advantageous embodiments of the invention are the subject of the description, the drawings or claims. The description is limited to essential aspects of the invention and other conditions. The drawing is to be used as a supplement. Show it:

• FIG. 1 a Jacquardweblitze invention in a rough overview,
• FIG. 2 the jacquard strokes behind FIG. 1 in a fragmentary perspective view,
• FIGS. 3 to 7 Cross sections of Jacquardweblitze after FIG. 2 , On different parts,
• FIG. 8 the jacquard strokes behind FIG. 2 , in side view and
• FIG. 9 the jacquard strokes behind FIG. 2 , in front view,
• FIGS. 10 and 11 further embodiments of the heddle according to the invention, each in a perspective sectional view, and
• FIG. 12 a preferred embodiment of Jacquardweblitze invention.

In FIG. 1 is a jacquard 1 illustrated, which is intended for use in Jacquard looms. It has an elongated Litzenköper 2, which is provided at its ends with fastening means, for example in the form of eyelets 3, 4. The heald body 2 consists for example of a wire, for example a stainless steel wire. But it can also consist of another suitable material, such as plastic.

The heddle 1 according to the invention is in FIG. 2 illustrated in more detail. It has a thread eye 5, which is preferably formed by a Fadenaugeinsatz 6. Such a Fadenaugeinsatz 6 is also referred to as "Maillon". It is formed by an annular element, which consists for example of hardened steel, ceramic, hard metal or a similar material and defines a central opening 7. At its outer periphery of the Fadenaugeinsatz 6, as FIG. 3 can recognize, provided with an all-round groove or channel 8.

For receiving the Fadenaugeinsatzes 6 of the heddle body is flattened in a section 9. Section 9 is in FIG. 2 separately illustrated. Starting from the circular cross section of the shank legs 10, 11 extending away from the section 9, the cross section of the shank leg 10 or 11 gradually changes into a flat cross section in an intermediate or transition section 9a. FIG. 7 illustrates the circular cross section of the shaft leg 10, which coincides with the circular cross section of the shaft leg 11. The circular cross-section of the shaft leg 10 or 11 has a cross-sectional area A1, which at the section line VII-VII in FIG. 2 is to measure and along the shaft 20 of the Jacquardlitze, which is formed by its legs 10 or 11, preferably unchanged.

At a small distance to the Fadenaugeinsatz 6 begins the section 9. Here, the circular cross-section is in a more and more flattened section over. For example, the cross section at the in FIG. 2 illustrated section line VI-VI, the cross-sectional shape after FIG. 6 on. This cross-section defines a cross-sectional area A2, which is preferably the same size as the cross-sectional area A1.

With increasing proximity to the Fadenaugeinsatz 6, the flattening of the strand body can increase. For example, at point VV, it has a cross-sectional shape FIG. 5 with a cross-sectional area A3, where A3 equals A2 equals A1. As can be seen, the flattened cross section after FIG. 5 have groove-shaped depressions 12, 13 at its upper and lower side, which can increase in depth in the further longitudinal course. this shows FIG. 4 , which represents the cross section IV-IV. The cross section may be approximately eight-shaped here. It has a total cross-sectional area A4, again A4 equal A3 equal to A2 equal to A1.

By creating the cross-sectional shape according to FIG. 4 can be in the flattened portion 9 legs 14, 15 separate and bend away from each other. In this case, the narrow web which divides the recesses 12, 13 separated from each other. The two legs 14, 15 thus define an opening 16 in which the Fadenaugeinsatz 6 can be held. The conditions are in FIG. 3 illustrated. Both legs 14, 15 each have a cross section with a cross-sectional area A5, A6, which are preferably equal to each other. In addition, the sum of the two cross-sectional areas A5, A6 is preferably the same size as the cross-section A4 or A3 or A2 or A1. As well as out FIG. 3 shows, the two-sided flattening of the strand body are the same. The heddle 1 is thus also and straight on the thread eye symmetrical to a plane of symmetry E, which passes through the middle of the two legs 14, 15 and through the shaft legs 10, 11.

Following the opening 16, the groove-like depressions 12, 13 extend (FIG. FIG. 8 ) over the flattened portion 9 to both shank legs 10, 11 out. At the ends of the recesses or at a certain distance to these transverse bores 12a, 12b may be arranged, which intersect the two recesses 12, 13 and are oriented parallel to the thread eye. The diameter of the two holes 12a, 12b is preferably greater than the width of the recesses 12, 13. The holes 12a, 12b act as a crack stopper when separating the legs 14, 15. The holes 12a, 12b then make as FIG. 1 or 9 As can be seen, the ends of the forming slot and prevent the crack propagates further when the legs 14, 15 are bent apart.

To further illustrate their structure, the heald 1 in the FIGS. 8 and 9 illustrated again. As can be seen, the heddle body 2 is formed out of a round wire by flattening the section 9 and providing it with longitudinal groove-like depressions 12, 13. The recess 12 located on the top is parallel to the located on the bottom Recess 13. Where the recesses 12, 13 are present, the flattened portion has the double wire cross section FIG. 4 , This can be like a two-wire strand in the two legs 14, 15 separated to form the opening 16. If the Fadenaugeinsatz 6 between the legs 14, 15 clamped, it can be secured with adhesive, whereby the stranded wire 1 is completed.

Modified embodiments of the strand 1 illustrate the FIGS. 10 and 11 , The above description applies analogously based on the same reference numerals. The Fadenaugeinsatz 6 is formed as a rectangular ring with pointed ends. Its two lateral grooves 8a and 8b have flanks at an angle to each other. In other words, the grooves 8a and 8b have a triangular cross section. In the embodiment according to FIG. 10 the legs 14, 15 each have a circular cross-section with the surface A5, A6. The sum of the cross-sectional areas A5, A6 again coincides with the cross-sectional area A1 of the cross-section of a shaft leg 10, 11. The adhesive 17 secures the Fadenaugeinsatz 6 and closes the opening 16. He can also penetrate into the groove 8 and hold the legs 14, 15 on the Fadenaugeinsatz 6.

The legs 14, 15 can, as FIG. 11 illustrated, also each have an externally rounded and inwardly in a pointed rib 18, 19 expiring cross-section. The cross-sectional areas A5, A6 in turn are as large as the cross-sectional area A1. Otherwise, the previous description applies accordingly.

FIG. 12 shows a preferred embodiment of a jacquard heald 1a, the heald body 2 is formed by a metal wire. For the formation of the thread eye 5 reference is made to the previous description, which also applies here based on the same reference numerals at least preferably. However, how can FIG. 12 indicates that the intermediate section 9a is dispensed with. The round shaft legs 10, 11 can pass directly into the diverging legs 14, 15, which hold the Maillon 6 between each other.

The heddle body 1 is provided at one end with the eyelet 3, to the formation of a wire portion 31 is bent in the manner of a hairpin by about 180 °. The end of this wire section 31 is connected to the heddle body 2, in particular the shank limb 11, at at least one, but preferably two points 21, 22. At the points 21, 22 welded joints can be formed. Between the two points 21, 22, the end of the wire section 31 may be arranged to extend parallel to the shaft leg 11.

At the opposite end of the stranded body 2, a fastening element 23 is preferably provided. This is formed for example by a plastic injection part, which is connected to the end of the shaft leg 10. The shank leg 10 may be provided at its end with one or more bends 24, 25, 26 such that it is bent, for example, zig-zag or wavy. The fastening element 23 may be formed, for example, as a plastic injection-molded part and surround this area with a cylindrical portion 27. Thus, a cohesive and / or a positive connection can be created.

The fastener 27 may, as FIG. 12 shows a pin-like extension 28 which is provided for anchoring a tension spring 29, for example with a thread 30. The extension 28 preferably has a smaller diameter than the portion 27 and is aligned concentrically with this. The thread 30 is preferably a conical thread. The tension spring 29 is preferably a helical spring made of spring wire.

A strand according to the invention is preferably made of a round wire having a central portion 9. This section has an 8-shaped cross-section which is defined by two legs connected together by a thin web. Here, the heddle body 2 can be separated to receive a Fadenaugeinsatzes 6. The Fadenaugeinsatz 6 is preferably secured in the resulting opening 16 by adhesive.

Reference numerals:

1, 1a

Hedgerow, jacquard strand

2

heald

3, 4

eyelets

5

thread eye

6

Thread eye / Maillon

7

opening

8, 8a,

8b gutter, groove

9

section

9a

intermediate section

10, 11

shank legs

12, 13

wells

12a, 12b

cross holes

14, 15

leg

A1 - A6

Cross-sectional areas

e

middle plane of symmetry

16

opening

17

adhesive

18, 19

rib

20

shaft

21, 22

Put

23

fastener

24-26

bends

27

cylindrical portion of the fastener

28

peg-like extension

29

mainspring

30

thread

31

wire section

Claims (15)

A jacquard strand comprising a strand body (2) made of a round material and having a shank (20) with a flattened portion (9) provided with a widened opening (16) delimited by two limbs (14, 15) the surface area A1 of the round cross-section of the shank (20) substantially coincides with the sum of the surface areas A5, A6 of the cross-sections of the legs (14, 15). Litz according to claim 1, characterized in that in the opening (16) a Fadenaugeinsatz (6) is taken and secured. Litz according to claim 1, characterized in that the two legs (14, 15) are bent away from each other. Litz according to claim 1, characterized in that the legs (14, 15) on their inner sides have a to the opening (16) projecting towards structure. Litz according to claim 1, characterized in that the legs (14, 15) have a rounded cross-section. A heald according to claim 1, characterized in that adjoining the widened opening (16) at at least one axial end is an unslotted flattened intermediate section (9a). Litz according to claim 1, characterized in that , following the opening (16), at least one crack stopper means (12a, 12b) is preferably arranged in the form of at least one transverse bore. Litz according to claim 7, characterized in that the crack stopper means (12a, 12b) is in the form of at least one transverse bore. Litz according to claim 1, characterized in that between the flattened portion (9) and the shank legs (10, 11) each have a continuous stepless transition is formed. Litz according to claim 1, characterized in that the round material is a round wire made of metal or plastic. Litz according to claim 1, characterized in that the opening (16) is produced by plastic non-cutting deformation. Litz according to Claim 1, characterized in that the stranded body (2) has at least one end of an eyelet (3) by a bent and at least one point (21, 22) welded to the strand body (2) wire section (31) is formed. Litz according to Claim 1, characterized in that the stranded body (2) is provided at least at one end with at least one bend (24, 25, 26). Strand according to claim 13, characterized in that at the end of the stranded body (2) provided with the bend (24, 25, 26), a fastening element (23) for fastening a tension spring (29) is arranged. Litz according to claim 14, characterized in that on the fastening element (23) for fastening the tension spring (29) has an axial pin-like extension (28) with a thread (30).

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