JP6316894B2 - A heald having a body partially composed of a plurality of foil layers - Google Patents

Description

  The present invention relates to a heald for a loom heald frame.

  A number of healds are placed on the loom heald frame, each of which is used to hold one warp. The heel opening is opened by the vertical movement of the heddle frame, and the weft thread can be inserted there. The loom incorporates a plurality of heald frames. One group of warps will therefore pass through the heald eye of one heald frame, while the other warp will be between two adjacent healds if they are controlled by the heald of another heald frame. Pass through the gap.

  In modern looms, the heald frame moves at high speed between the two turn-around points, which requires rapid acceleration of the heald frame. This causes the heald to be exposed to great stress. On the one hand, despite moving against the warp, they must be strong enough and have the longest possible service life. On the other hand, the heald as light as possible is desirable, so that the weight of the entire heald frame with many healds that have to be accelerated can be kept as low as possible.

  A heald for a heald body punched out of metal or resin is known from US Pat. The eye (threadhole) portion is bent or twisted out in the plane of the remaining heald body, and in addition, the longitudinal webs adjacent to the eye intersect.

  Furthermore, a heald made from a resin is known from US Pat. This purpose heald is characterized by a special shape of the guide surface of the eye part.

  U.S. Pat. No. 6,089,089 further discloses a resin heald in which the eye is surrounded on the sides by two mutually offset webs. Adjacent to the eye, there are thick sloped parts above and below. Their purpose is to hold the adjacent healds slightly apart from each other, so that the warp passing between two adjacent healds gently slides on its outer surface.

  A heald having a heald body made of a flat metal band is also known, for example, from US Pat. Patent Document 5 proposes to attach a resin end small hole (ear hole) to the metal portion of the heald body.

German Patent No. 4336362 European Patent Application Publication No. 2224046 German Patent Application No. 102005030632 US Pat. No. 5,348,055 Swiss patent 601532

  In view of the above background, an object of the present invention is to provide a heald that can be easily manufactured and has a long lifetime. A method for manufacturing such healds is also disclosed.

  The heald has a heald body that extends in the longitudinal direction and has an eye (yarn hole) that receives the warp. The heald body itself preferably has an end eyelet (ear hole), which allows the heald to be provided on the heald support rail of the heald frame. The heald body has at least two foil layers or is constituted by a foil layer in the reinforcing region. The foil layers are placed flat and joined to each other. These foil layers are bonded together, in particular by material bonding, for example adhesion. The reinforced region may have one or more foil inner layers surrounded by two foil outer layers like a sandwich. The heald may have one or more reinforcing regions along its length. The reinforcing regions may be arranged away from each other or may be arranged directly adjacent to each other. It is possible to form the entire heald from a plurality of foil layers which are continuous over the longitudinal direction.

  As a result, it is possible to manufacture the heald from a thin foil-like material that is reinforced at least in the reinforcing region by an additional foil layer. The foil inner layer can be provided, for example, over the entire length of the heald body and provides the tensile strength required by the heald body. For example, in the eye region, the foil inner layer may be reinforced by providing one or more additional foil layers, thereby improving the resistance of the heald body to warp cuts. The material of the different foil layers is selected according to the desired properties.

  In a preferred embodiment, the individual foil layers are made from a resin material. Here, the resin material also functions as a resin base material. Additive elements such as fibers, spheres or other objects are added to the resin matrix, thereby forming a resin-based composite material. The additive element can be glass, ceramics or metal.

  The resin or the composite material may be conductive, or may have a conductive element to prevent charging of the resin heald. When the heald is in the working position, the conductive member of the heald creates an electrical connection to the at least one conductive heald support frame, thereby causing a discharge through the heald support rail of the heald frame and thereby the heald Prevent charging of the body. The entire resinous heald or only the individual layers of the multi-layered heald that are to be electrically conductive can be composed of conductive resin or composite material. For example, the entire conductive layer or heald body can be composed of a composite material comprising a non-conductive resin matrix, in combination with a conductive additive element, for example with metal and / or graphite. The additive element may for example consist of long fibers and / or so-called whiskers and / or nanotubes or similar materials.

  In one form, the heald body has a metal layer at least partially on the outer surface of the two flat surfaces and / or in the eye region. This reduces the friction of the heald body, particularly in the region where the heald body contacts the warp. The metal layers may be electrically connected to each other and may form an electrical connection to at least one conductive heald support rail when the heald is in the working position.

  The heald body may have a greater thickness in at least one reinforcing region, which may be referred to as a connection region, than the thickness that the heald body has in the region adjacent to the reinforcing region. The number of foil layers in the reinforcement region may be greater than the number of foil layers in the connection region. In one form, the connecting region consists of a single layer having only one foil layer, while the foil layer is reinforced by at least one additional foil layer in one or more reinforcing regions. That is enough. As a result, the heald is extremely light and limits the use of material to the area where the heald body should be reinforced. This is especially true for the area surrounding the eye guiding the warp and / or the 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 foil center layer used to provide tensile strength may be, for example, greater than the thickness of the foil layer present thereon that prevents the heald from being cut by the yarn. The thickness of the foil layer is here measured in particular perpendicular to the plane on which the foil layer is present.

  The above-described heald is manufactured by providing at least one first foil strip and a second foil strip. In order to form a minimal reinforced area, the two foil strips are placed one on top of the other and joined together, for example by adhesive or other material bonding. Alternatively, the foil strips may be joined together directly while being manufactured, for example, by co-extruding the multilayer strips. In order to increase the strength of the multi-layer strip, the strip is pulled in the length direction and / or in a direction transverse to the width direction. In this way, the molecular structure is matched and the strength in the tensile direction is increased. It is also possible to pull one or more foil layers and then combine them into a multilayer foil.

  In this way, strips having a plurality of layers are created at least in the reinforcement region. In this case, the heald body is separated from at least a partial multilayer strip, for example by stamping. End eyelets and eyes may be punched out. The outer shell of the heald body may be stamped simultaneously or later. In this way, a plurality of heald bodies can be stamped from a single multilayer strip.

  Instead of punching, the heald body may be cut from the multilayer strip, for example by laser cutting or ultrasonic cutting.

  In a preferred form, the cut or stamped heald body becomes a finished heald itself without further processing. As an alternative to this, depending on the rigidity of the heald body, it may be necessary to rotate or curve the longitudinal central region surrounding the eye from the face of the punched heald body. This is because the warp yarns extend substantially perpendicular to the direction of the heald support rail. In an extremely thin heald body with small torsional rigidity, the eye is rotated by the warp itself and moved to the working position. However, with respect to the eye area, in the case of extremely delicate yarns, it may be necessary to plastically deform to reduce the force applied to the warp yarns by the rotational torque of the heald body. In this type of heald, after the healds are separated, the longitudinal region in the eye region is subjected to curvature and plastic deformation, for example by heat, so that the heald remains in the corresponding region.

  The heald and its manufacture are described below based on specific embodiments. Further advantageous forms emerge from the description and the dependent claims with reference to the drawings.

FIG. 6 is a very schematic view of the side of the heald viewed from the eyelet and the eye. It is a schematic perspective view of the multilayer strip by which the heald main body concerning FIG. 1 is stamped. FIG. 5 is a further view of the heald showing the end eyelet very schematically, with the longitudinal portion twisted in the area surrounding the eye. FIG. 4 is a cross-sectional view in a direction transverse to the longitudinal direction of the heald of FIG. 3 taken along line IV-IV. FIG. 6 shows a further embodiment of the heald, showing a schematic view of the flat surface of the foil layer. FIG. 6 is an example of a heald reinforcement region in the eye region having a plurality of foil inner layers and two foil outer layers.

  In the drawing, a heald 10 comprising a heald body 11 extending in the longitudinal direction L is shown. The heald body 11 has an eye 12 that guides the warp thread located substantially at the center of the heald body 11. End eyelets 13 are provided in each of the two longitudinal ends of the heald body 11 and are used to place the heald on the heald support rails of the heald frame. In the embodiment described here, the end eyelet 13 is shown as a closed annular O shaped eyelet. Alternatively, it is also possible to form an end small hole at a proper position on the side surface to form a C-shaped or J-shaped end small hole.

  The different embodiments of the heald 10 shown in the drawing are highly schematic, unlike the actual scale. The drawings are for explaining the heald 10 according to the present invention and the principle of its manufacture.

  Along the at least one reinforcing region 15 extending in the longitudinal direction L, the heald body is composed of a plurality of layers. At least within this reinforced region 15, the heald body 11 consists of two or more layers 16 of foil. These layers rest flat and are joined together. In particular, the surface of the foil layer 16 is bonded by a material bond such as an adhesive. The material bonding portion is preferably formed over the entire contact surface between the foil layers 16 adjacent to each other. Alternatively, different layers of foil can be manufactured by coextrusion and bonded together in a single step, thereby eliminating subsequent bonding processes such as bonding.

  The number of foil layers 16 in the reinforcement region 15 can be variable. There is preferably at least one foil center layer or foil inner layer 16a sandwiched between the two foil outer layers 16b. In this embodiment, the required tensile strength is imparted to the heald body 11 using at least one foil inner layer 16a. The thickness of at least one foil inner layer 16a, the number of foil inner layers 16a, materials, etc. are selected to be appropriate for this purpose. It is preferable that the entire body 11 is made of resin. Different foil layers, in particular the foil inner layer 16a and the foil outer layer 16b, may consist of different resins. It is possible to employ resin-based composite materials, in which additive elements, which can consist, for example, of glass and / or ceramics and / or metals, can be incorporated into the resin matrix. The additive elements can be formed from short fibers (known as whiskers) and / or spheres and / or other small objects. However, a uniform material is used for each layer of foil.

  In the reinforced area 15, two foil outer layers 16b are used to improve the resistance of the heald body 11 to friction arising from the warp yarn 19 or heald support rail. For this reason, in a preferred embodiment, at least three reinforcing areas 15 are provided. Two end eyelets 13 and an eye 12 are provided in these three reinforcing areas 15. The heald body 11 is particularly protected from being scored by the warp threads 19 in the central reinforcement region 15. The heald 19 is moved rapidly at high speed in the working position and receives the warp yarn passing through the eye 12, thereby leading the yarn to the desired position. As a result of the high speed, a relatively large force is also provided between the warp yarn 19 and the heald body 11. For this reason, the two foil outer layers 16b surrounding the eye 12 are made of a resin or composite material that is particularly resistant to friction and ensures a long life against the heald 10. For example, polyethylene, polypropylene or polycarbonate can be used for at least the foil inner layer 16a. For example, polyamide can be used for the foil outer layer 16b. The above-described resin can also be used as a resin base material in the composite material. In order to manufacture the main body 11, foil strips are prepared and joined flatly to form a multilayer strip 17 as shown in FIG. 2, for example. In this embodiment, the entire heald body 11 is composed of a plurality of layers over the entire length L. The number of foil layers 16 in the longitudinal direction L is constant throughout the heald body. All layers of the foil 16 extend over the entire length of the heald body 11.

  The heald body 11 is later cut off from such a multilayer foil strip 17. The hull body 11 is preferably stamped. The punching process can be performed in one or more steps. First, the eye 12 and the end small hole 13 can be punched from the foil strip 17 as an initial punching step. The outer shell 18 is subsequently punched. Alternatively, the punching process can be performed simultaneously. As shown schematically in FIG. 1, after punching, a heald body 11 is obtained as a stamped part.

  Depending on the torsional rigidity of the main body 11, it may be necessary to twist the surface on which the eye 12 is present with respect to the surface on which the end small hole 13 is present, as shown in FIGS. is there. For this purpose, the central longitudinal region of the heald body 11 can be plastically deformed, thereby fixing the eye surface in a twisted position relative to the surface where the end eyelet 13 is present. Can do. This allows the warp yarn 19 to pass through the eye 12 in such a way that the warp yarn 19 is not exposed to the torque from the heald 10.

  The foil layer 16 of the heald body 11 may be shorter in the longitudinal direction L than the heald body 11 and may be provided only in one reinforcing region 15. In the transverse direction Q perpendicular to the longitudinal direction L and in the plane where the foil layer 16 is present, all the foil layers 16 extend over the entire width of the heald body 11.

  As a modification of the embodiment shown in FIGS. 1 to 4, in the embodiment of the heald 10 according to FIG. 5, the heald body 11 is formed with a non-uniform thickness in the longitudinal direction L. . This heald main body is provided with a plurality of reinforcing regions 15, and in this example, there are three. These regions are separated from each other in the longitudinal direction L. These regions are located in two end regions in the vicinity of the end small hole 13 and in the central region of the eye 12. Each of the two reinforcing regions 12 at the end is connected to the central reinforcing region 15 by a connection region 21. The number of foil layers 16 in the connection area 21 is smaller than in the reinforcement area 15. In the embodiment, the connection region has only one central or inner layer 16a. This foil inner layer 16a extends in the longitudinal direction L continuously throughout the heald body 11. In the reinforcing region, the foil inner layer 16a is reinforced by at least one additional foil layer, in this example two foil outer layers 16b located on opposite sides like a sandwich. In order to produce this kind of heald 10, the multi-layer strip 17 has a plurality of foil layers in the region corresponding to the portion of the reinforcing region 15 to be reinforced after the heald body 11 is stamped. Only. The view of the front edge of this type of foil strip 17 corresponds to FIG.

  Each layer of foil 16 may have a different thickness depending on its function and / or the material used. By way of example only, foil layers 16 having different thicknesses are shown in FIG. In this embodiment, a plurality of foil inner layers 16a are provided. Each of these layers has a thickness da. All the foil inner layers 16 a extend in the longitudinal direction L along the entire heald body 11. Therefore, the total thickness di increases with the number of foil inner layers 16a provided. In this example, five foil inner layers 16a are provided, the number of which can be selected according to the specification. For example, depending on the particular application, the tensile strength of the heald 10 can be improved by increasing the number of inner foil layers 16a. This allows the heald 10 to be manufactured very flexibly and economically, in which case the manufacture can be adapted very easily for different loads.

  On the other hand, the thickness db of the two foil outer layers 16b is smaller than the total thickness di of all the foil inner layers 16a, for example, larger than the thickness da of the foil inner layer 16a alone. As a modified example, a plurality of foil outer layers 16 b can be provided on both sides of the heald body 11.

  The present invention relates to a heald 10 comprising a heald body 11 consisting at least in part of a plurality of layers. The hold body 11 includes at least one reinforcing region 15 composed of a plurality of foil layers 16. It is preferred that at least one foil inner layer 16a extends in the longitudinal direction L along the entire heald body 11. This at least one foil inner layer 16a is reinforced by at least one, preferably two foil outer layers 16b, particularly in the region around the eye 12 and / or in the region around the end eyelet 13 of the heald body 11. Thereby, the reinforcing region 15 is formed. The reinforcing region 15 can preferably be formed like a sandwich from at least three foil layers 16a, 16b. Simple manufacture is achieved by the foil strip comprising at least partly a plurality of layers and by cutting or punching the heald body 11 from the multilayer foil strip.

10 Held 11 Held body 12 Eye (thread hole)
13 End hole 15 Reinforcement region 16 Foil layer 16a Foil inner layer 16b Foil outer layer 17 Foil strip 18 Outer 19 Warp yarn 21 Connection region da Foil inner layer thickness db Foil outer layer thickness di All foil inner layers Total thickness L Longitudinal direction Q Transverse direction

Claims (9)

Held body (11) extending in the longitudinal direction (L), comprising an eye (12) used for receiving the warp yarn (19) and a small end hole for providing the heald body on the heald support rail of the heald frame ( 13) a heald body (11) having
The heald body (11) extends in at least one reinforcing region (15) only in parallel with the surface on which the eye (12) is present, or only in parallel with the surface on which the end eyelet (13) is present. has at least two foil layers (16) are joined together with the flat mounting each other,
The two foil layers (16) consist of at least one first material foil layer (16a) and another one second material foil layer (16b), or the reinforcing region The thickness (da, db) of the two foil layers (16a, 16b) in (15) are of different sizes.   The heald according to claim 1, characterized in that at least three foil layers (16) are provided in the reinforcing region (15).   The heald according to claim 1, characterized in that the heald body (11) comprises a plurality of the reinforcing regions (15) each having at least two foil layers (16).   The connection area (21) of the heald body (11) is adjacent to the reinforcement area (15) of the heald body (11) comprising at least two foil layers (16a, 16b), and the connection area ( 21. Held according to claim 1, characterized in that 21) comprises a smaller number of said foil layers (16a) than adjacent said reinforced areas (15).   The heald according to claim 4, characterized in that the heald body (11) has only one foil layer (16a) in the connection region (21).   The heald according to claim 1, characterized in that the entire heald body (11) consists of at least two foil layers (16).   The heald according to claim 1, characterized in that at least one foil center layer (16a) extends in the longitudinal direction (L) along the entire length of the heald body (11).   The heald according to claim 7, characterized in that the foil center layer (16a) is located in the reinforcement region (15) between two foil inner layers (16b).   The heald according to claim 1, characterized in that the heald body (11) is made of a resin material.

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