KR20120110016A - Heddle with a heddle body constructed in part from multiple layers of foil - Google Patents

Abstract

PURPOSE: A heddle with a heddle body which partially comprises a plurality of foil layers is provided to enable easy production through cutting or punching the heddle body. CONSTITUTION: A heddle(10) for a heddle frame comprises: a heddle body(11) with a thread eye(12) used for containing warp thread; and two or more foil layers at one or more reinforcing regions, which are coupled each other. The heddle body comprises a plurality of the reinforcing regions each with two or more foil layers. A foil layer is formed of a first material. One or more other foil layers are made of a second material. The heddle body is made of a plastic material.

Description

HEADLE WITH A HEDDLE BODY CONSTRUCTED IN PART FROM MULTIPLE LAYERS OF FOIL

TECHNICAL FIELD The present invention relates to a headdle for a heddle frame of a weaving machine. Multiple heads are arranged on the head frame of the loom, each of which is used to hold one warp thread. By moving the head frame up and down, the shed is opened and a weft thread can be inserted there through. The loom has a plurality of head frames. Thus, one group of warp passes through the thread eye of the head of one helm frame, and the other warp passes through the gap between two neighboring heel when they are controlled by the head of the other helm frame do.

In modern looms, the helm frame moves at high speed between two inversion points, which requires high acceleration of the helm frame. This gives high stress on the headle. First, they must be strong enough and have the longest service life possible, even though they move relative to the warp. On the other hand, the lightest possible haedles are preferred so that the total weight of the headed frame with its multiple headles to be accelerated can be kept as low as possible.

Heads are known from DE 43 36 362 C1 with a head body which can be stamped with metal or plastic. The area of the thread eye is rotated or twisted from the plane in which the rest of the head body is located, in addition to which the longitudinal webs adjacent the thread eye intersect.

Additional heads made from plastics are known from EP 2 224 046 A1. This plastic headdle is characterized by the specific shape of the guide surface in the region of the thread eye.

DE 10 2005 030 632 A1 also discloses a plastic headle whose threaded eye is bounded by two mutually biased webs on the side. At the top and bottom, thick sloped areas are located adjacent to the thread eye. Their purpose is to keep the neighboring heads at a distance and to ensure that all warps passing between the two neighboring heads can glide smoothly on the outer surface.

The heads are also known from US 5,348,055 which have a head body for example made of flat metal strips. CH 601 532 also proposes attaching a plastic end eyelet to the metal part of the headle body.

For this background art, it is contemplated that the task of the present invention is to provide a headpiece that can be easily manufactured and has a long service life. Also disclosed is a method for the manufacture of such a headset.

This task is met by a headle having the features of claim 1 and by a manufacturing method having the features of claim 12.

The heddle has a heddle body with a threaded eye for extending longitudinally and taking the warp. Suitably the head body itself also has an end eyelet that can be arranged on the head support rail of the head frame. The headle body has at least two foil layers in the reinforcement area, or is constituted by foil layers lying flat against each other and joined together. The foil layers are joined together in particular by material bonding, for example by bonding. It is also possible for the reinforcement region to comprise one or more inner foil layers surrounded by two outer foil layers, such as a sandwich. The head may comprise one or more reinforcement regions along its length. The reinforcement regions may be located at a distance from each other, or may be located next to each other. It is also possible to construct the entire headle from a plurality of longitudinally continuous foil layers.

As a result, it is possible to manufacture the headdle from a thin foil-like material that is reinforced by an additional foil layer at least in the reinforcement area. The inner foil layer can be arranged along the entire length of the head body, for example, to provide the tensile strength required by the head body. In the area of the thread eye, for example, this inner foil can be reinforced by applying one or more additional layers of foil, thereby improving the resistance of the head body to notch formation by the warp. The materials of the different foil layers are selected in view of the desired properties.

In one suitable embodiment, the individual foil layers are made of plastic material. The plastic material can here also function as a plastic matrix to which additional elements such as fibers, balls or other bodies are added, thus creating a plastic based composite material. The additional element can be made of glass, ceramic or metal.

The plastic or composite material can be electrically conductive or can be provided with an electrically conductive element to prevent the plastic headdle from acquiring a static charge. When the headdle is in its working position, the electrically conductive component is connected to at least one electrically conductive head support rail to allow electrical discharge through the head support rail of the head frame and thereby prevent electrostatic charge of the head body. Create electrical connections. It is possible that the entire body of the plastics head is made of an electrically conductive plastic or a composite material, or that only individual layers of the multilayer heads are electrically conductive. For example, it is possible for the electrically conductive layer or the head body as a whole to consist of a composite material comprising a non-electrically conductive plastic matrix, for example in combination with an electrically conductive additive element consisting of metal and / or graphite. The additional element may for example consist of elongated fibers and / or so-called whiskers and / or nanotubes or similar materials.

In one embodiment, the headle body may have a metal layer on the outer surface of its two flat surfaces at least in the section and / or in the region of the thread eye. This reduces wear of the head body, particularly in the areas in contact with the warp. The metal layers can be electrically connected to each other and can create an electrical connection to the at least one electrically conductive head support rail when the headle is in its working position.

The headle body may have a greater thickness in at least one reinforcement area, which may be called a connection area, than in an area adjacent to the reinforcement area. The number of foil layers may for example be greater in the reinforcement area than in the connection area. In one embodiment, it may be sufficient to make the connection area into a single layer comprising only one foil layer, which foil layer is reinforced in one or more reinforcement areas by at least one additional foil layer. As a result, the heddle is very light in weight, and the use of the material is limited to the area necessary for the heddle body to be reinforced. This particularly refers to the area surrounding the thread eye guiding the warp and / or the end area surrounding the end eyelet. The thicknesses of the foil layers arranged on top of each other in the reinforcement region can be different. The central foil layer used to set the tensile strength may have a thickness greater than the foil layer arranged thereon, for example, where the head body prevents notch formation by the thread. The thickness of the foil layer is measured here perpendicular to the plane in which it lies.

The described headdle is manufactured through the provision of at least one first foil strip and a second foil strip. In order to form at least one reinforcing area, strips of two foils are arranged on top of each other and joined together, for example by bonding or through some other material bonding. Alternatively, the strips of foil can be joined together directly during the process of their manufacture, for example by coextrusion of the multilayer strips. To increase the strength of the multilayer strip, it can be drawn transversely to it in the direction of its length and / or in the direction of its width. In this way, the molecular structure is aligned and the strength in the direction of drawing is increased. It is also possible to draw one or more of the foil layers and then combine them into a multilayer strip.

In this way, a strip is produced having a plurality of layers at least in the reinforcement region. The headle body is then separated at least partially from the multilayer strip, for example by stamping. The headle body is manufactured as a separate or stamped part in this manner. The end eyelets and thread eyes can be punched here. The outer contour of the headle body can be punched simultaneously or later. In this way, multiple head bodies can be stamped from one multilayer strip.

As an alternative to punching, the head body can also be cut from the multilayer strip, for example by laser or ultrasonic cutting.

In one preferred embodiment, the cut or stamped head body is a finished head itself, although no further treatment is provided. As an alternative, it may be necessary to rotate or twist the central longitudinal area surrounding the thread eye from the plane of the punched headed body, for example depending on the rigidity of the headed body, which means that the warp This is because it extends at approximately right angles to the direction. In a very thin headed body with less torsional stiffness, the rotation of the thread eye into its working position is realized by the warp itself. Nevertheless, very delicate yarns for the area of the threaded eye may need to be plastically deformed to reduce the force applied to the warp by the rotational torque of the headle body. In this kind of headdle, after the head body has been separated, the longitudinal area of the area of the threaded eye is twisted and plastically deformed, for example by the aid of heat, to remain in this position.

Heads and manufacturing methods will be described below in terms of specific examples. Other advantageous embodiments appear from the description and the dependent patent claims, and also refer to the drawings.

1 is a high schematic view of the side view of a head when viewing the end eyelet and thread eye.
FIG. 2 is a schematic perspective view of a multilayer strip in which the head body of FIG. 1 may be stamped. FIG.
FIG. 3 is a diagram of another embodiment of the headle showing a highly schematic side view of the end eyelet, wherein the longitudinal region is twisted in the region of the thread eye. FIG.
4 is a partial cross-sectional view of the thread eye transverse to the longitudinal direction of the head of FIG. 3 along cutting line IV-IV.
FIG. 5 is a diagram of another embodiment of the headless showing a schematic view of a flat surface in the plane of the foil layer. FIG.
6 is an illustration of an embodiment of a reinforcement region of the headle in the region of a thread eye having multiple inner foil layers and two outer foil layers.

The figure shows an embodiment of the headdle 10 with the head body 11 extending in the longitudinal direction L. As shown in FIG. The headle body 11 has a thread eye 12 for guiding a warp yarn located approximately in the middle of the headle body 11. An end eyelet 13 is provided at each of the two longitudinal ends of the head body 11 and is used to arrange the head on the head support rail of the head frame. In the embodiment described herein, the end eyelet 13 is represented as a closed annular O-shaped end eyelet. As an alternative to this, it is also possible to open the end eyelets at the side in one position to form a C- or J-shaped end eyelet.

The different embodiments of the headle 10 shown in the figures are shown in a highly schematic manner, rather than in actual scale. The drawings are only intended to illustrate the principle of the headdle 10 and its manufacture according to the invention.

Along the at least one reinforcement region 15 extending in the longitudinal direction L, the head body consists of a plurality of layers. At least in the reinforcement region 15, the head body 11 consists of two or more foil layers 16 lying flat against each other and bonded together. The surface of the foil layer 16 is joined in particular by material bonding such as adhesion. Material bonding is suitably made over the entire surface along the entire contact surface between the foil layers 16 lying adjacent to each other. Alternatively, different layers of foil can be produced by coextrusion and joined together in a single step, so that subsequent bonding processes such as adhesion can be omitted.

The number of foil layers 16 in the reinforcement region 15 may vary. Suitably, at least one central or inner foil layer 16a is present and interposed between the two outer foil layers 16b. At least one inner foil layer 16a is used to provide the head body 11 with the tensile strength required in this embodiment. The thickness of at least one inner foil layer 16a, the number of inner foil layers 16a, the material and the like are appropriately selected for this. Suitably, the entire head body 11 is made of plastic. The different foil layers, in particular the inner foil layer 16a and the outer foil layer 16b, may be made of different plastics. It is also possible to use composite materials based on plastics, whereby additional elements are incorporated into the plastic matrix, which may for example consist of glass and / or ceramics and / or metals. Such additional elements may be formed of short fibers (whiskers) and / or spheres and / or other small bodies. However, consistent materials are used for each layer of foil.

In the reinforcement region 15, two outer foil layers 16b are used to improve the wear resistance of the head body 11 arising from the warp yarn 19 or from the head support rails. For this reason, at least three reinforcement regions 15 are provided in one suitable embodiment. Two end eyelets 13 and threaded eyes 12 are located in these three reinforcement regions 15. The headle body 11 must in particular be protected from being notched by the warp yarns 19 in the central reinforcement region 15. In the working position, the headle 10 accelerates rapidly and takes a warp that passes with it through the thread eye 12 with it to guide the thread to the desired position. The high acceleration also creates a relatively large force between the warp yarn 19 and the headle body 11. For this reason, the two outer foil layers 16b surrounding the thread eye 12 are made from plastic or composite material which is particularly wear resistant and guarantees a long service life for the headle 10. Polyethylene, polypropylene or polycarbonate can be used for at least one inner foil layer 16a, for example. Polyamide can be used for example for the outer foil layer 16b. Named plastics can also be used as plastic matrices in composite materials. In order to manufacture the headle body 11, the strips of foil are provided flat to each other and joined together, and subsequently constitute a multilayer strip 17 as shown in FIG. 2, for example. In this embodiment, the entire head body 11 is made of multiple layers along its entire length L. The number of foil layers 16 in the longitudinal direction L is constant along the headle body. All foil layers 16 extend over the entire length of the head body 11.

The headle body 11 is subsequently separated from this multilayer foil strip 17. The head body 11 is suitably stamped. The stamping process can be performed in one or more steps. It is possible to first stamp the thread eye 12 and the end eyelet 13 from the strip of foil 17 in the first stamping procedure. The outer contour 18 can then be stamped. Alternatively, the stamping procedure can be performed simultaneously. After stamping, the head body 11 is obtained as a stamped part as schematically shown in FIG. 1.

Depending on the torsional stiffness of the headle body 11, it may be necessary for the thread eye 12 to twist the plane in which it lays relative to the plane in which the end eyelet 13 lies, as shown in FIGS. 3 and 4. For this purpose, the middle longitudinal region of the headle body 11 can be plastically deformed to fix the plane of the thread eye in a twisted position with respect to the plane of the end eyelet 13. This makes it possible for the warp yarn 19 to pass through the warp yarn 19 through the thread eye 12 without being torqued by the headle 10.

The foil layer 16 of the headle body 11 may be shorter in terms of the longitudinal direction L than the headle body 11, so that it is arranged only in one reinforcement region 15. In the transverse direction Q perpendicular to the longitudinal direction L and in the plane in which the foil layer 16 is located, all the foil layers 16 extend over the full width of the head body 11.

As a variant of the embodiment shown in FIGS. 1 to 4, in an exemplary embodiment of the headle 10 according to FIG. 5, the headle body 11 is formed with a thickness that is not constant in the longitudinal direction L. FIG. It has a plurality of reinforcement regions 15, in this example three, separated from each other in the longitudinal direction L. They are located in the two end regions by the end eyelets 13 and in the central region in the thread eye 12. Each of the two reinforcement regions 15 at the end is connected to the central reinforcement region 15 by a connecting region 21. The number of foil layers 16 in the connection region 21 is lower than in the reinforcement region 15. In an exemplary embodiment, the connection region includes only one central or inner foil layer 16a. This inner foil layer 16a extends continuously in the longitudinal direction L through the entire head body 11. In the reinforcement area, the inner foil layer 16a is reinforced by at least one additional foil layer by two outer foil layers 16b located on opposite sides, such as a sandwich in this example. To manufacture this kind of headdle 10, the multilayer strip 17 only has a plurality of layers of foil in the area corresponding to what may be the reinforcement area 15 after the headle body 11 has been separated. The drawing of the front edge of this kind of foil strip 17 will correspond to the illustration of FIG. 5.

Depending on their function and / or on the materials used, the individual foil layers 16 may have different thicknesses. As a simple example, an illustration of foil layers 16 with different thicknesses is shown in FIG. 6. In this exemplary embodiment, a plurality of inner foil layers 16a are provided, each having a thickness da. All inner foil layers 16a extend in the longitudinal direction L along the entire head body 11. Thus, the total thickness di arises from the thickness da of one inner foil layer 16a multiplied by the number of inner foil layers 16a provided. In this example, five inner foil layers 16a are provided here, whereby their number can be selected on demand. For example, depending on the particular application, the tensile strength of the headle 10 can be increased by increasing the number of inner foil layers 16a. This allows for a very elastic and economical manufacture of the headle 10, whereby the manufacture can be very easily adapted to different loadings.

In contrast, the thickness db of the two outer foil layers 16b is less than the total thickness di of all the inner foil layers 16a, for example greater than the thickness da of the single inner foil layer 16a. . As a variant, it is also possible for a plurality of outer foil layers 16b to be provided on both sides of the head body 11.

The present invention relates to a headle 10 in which the head body 11 is at least partially composed of a plurality of layers. The headle body 11 has at least one reinforcing area 15 consisting of a plurality of foil layers 16. Suitably, at least one inner foil layer 16a extends in the longitudinal direction L along the entire head body 11. This at least one inner foil layer 16a is reinforced in particular by the at least one and preferably two outer foil layers 16b in the region around the thread eye 12 and / or to form the reinforcement region 15. In the area around the end eyelet 13 of the handled head 11. The reinforcement region 15 may suitably be configured like a sandwich from at least three foil layers 16a, 16b. Easy manufacture takes place at least in part through the provision of a strip of foil with multiple layers and through the cutting or punching of the head body 11 from this multilayer foil strip.

10: headle 11: headle body
12: Thread Eye 13: End Eyelet
15: reinforcement area 16: foil layer
16a: inner foil layer 16b: outer foil layer
17: foil strip 18: outer contour
19: warp yarn 21: connection area
da: thickness of the inner foil layer db: thickness of the outer foil layer
di: total thickness of all inner foil layers L: longitudinal
Q: transverse

Claims (15)

As the headdle 10 for the helm frame,
Has a head body 11 having a thread eye 12 extending in the longitudinal direction L and used to receive the warp yarn 19,
The headle (11) has at least one reinforcing area (15) with at least two foil layers (16) lying flat against each other and joined together. Haddle according to claim 1, characterized in that at least three foil layers (16) are provided in the reinforcing area (15). The head heel according to claim 1, characterized in that the head body (11) has a plurality of reinforcement regions (15) each having at least two foil layers (16). The connection region 21 of the headle body 11 is adjacent to the reinforcement region 15 of the headle body 11 having at least two foil layers 16a, 16b, and the connection is made. Haddle, characterized in that the area 21 has fewer foil layers 16a than the adjacent reinforcing area 15. 5. The headless according to claim 4, wherein the headle body (11) has only one foil layer (16a) in the connection area (21). The head heel according to claim 1, wherein the entire head body (11) consists of at least two foil layers (16). The method of claim 1,
The at least one central foil layer (16a) is characterized in that it extends in the longitudinal direction (L) along the entire length of the headle body (11). 8. The headhead according to claim 7, wherein the central foil layer (16a) is located in a reinforcement region (15) between two outer foil layers (16b). 2. The headless of claim 1, wherein the one foil layer (16a) is made of a first material and the at least one other foil layer (16b) is made of a second material. The head heel according to claim 1, wherein said head body (11) is made of a plastic material. 2. The headhead according to claim 1, wherein the thicknesses (da, db) of the two foil layers (16a, 16b) in the reinforcement region (15) have different sizes. A method of making a headle (10) having a headle body (11) having a threaded eye (12) used to receive a warp yarn (19) and extending in the longitudinal direction (L),
Providing a plurality of strip layers 17 bonded together,
-Separating said head body (11) from a multilayer strip (17). 13. The method according to claim 12, wherein when detaching the headle body 11, the end eyelets 13 and the thread eye 12 are at least partially stamped from the multilayer strip 17 and at the same time or later. A method of making a hadle, characterized in that the outer contour (18) of (11) is stamped. 13. Method according to claim 12, characterized in that the area of the thread eye (12) is plastically deformed after the headle body (11) is at least partially separated from the multilayer strip (17). 13. The method according to claim 12, characterized in that the multilayer strip (17) is produced by coextrusion or the multilayer strip (17) is produced using a separate bonding process step from a plurality of foil layers (16). Manufacturing method

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