EP1528130B1 - Heald frame of composite structure - Google Patents

Abstract

A heald shaft comprises a first stiffening body disposed in a first chamber of a base body and glued at two sides of base body; and a second stiffening body disposed in a second chamber of the base body and glued at least at two sides to the base body. A heald shaft comprises an elongated base body (9) formed as a hollow profile body and having two side walls (11, 12) interconnected by a web (18, 19, 20, 21) and having at least one first chamber and at least one second chamber, each being open at least at one side; a first stiffening body (24) occupying the width of the base body and disposed in the first chamber; and a second stiffening body (25) occupying the width of the base body and disposed in the second chamber. The stiffening bodies are glued at least at two sides to the base body.

Description

The invention relates to a weaving shank for weaving machines, in particular high-speed weaving machines.

The shafts of looms are moved very quickly during weaving and excited to vibrate. This is generally true, but with long shafts (wide webs) can lead to special problems. The shaft vibrations are excited both in the longitudinal direction of movement and transversely thereto. They lead to loads on the heald, on the strands, on the Litzentragschienen and on the warp threads. The loads can lead to premature strand breakage, shaft breakage or other inconveniences.

It has already been tried several times, on the one hand to reduce the weight of the shaft rods to reduce the vibration excitation and on the other hand, to increase the rigidity of the shaft rods. These efforts have resulted in improved shaft rods, but it is still the goal of further development to increase the limits on the operating speed of the loom and to improve the precision of the thread guide, i. ultimately to reduce the vibration amplitudes of the bending vibrations of the shaft rods.

The vibration tendency of the shaft rods contributes significantly to the noise generation of looms and their wear. Also in terms of noise reduction, it is an objective of the development of heddles to reduce their tendency to vibration.

From the DE 29 43 953 C2 is a Webschaftstab known, which is designed as a light metal hollow chamber profile. This has two flat side walls which enclose a plurality of hollow chambers. One of the side walls is glued to a steel strip extending almost over the entire height of the side wall, which is intended to reduce the vibrations of the shaft rod and thus to reduce the generated sound intensity.

It is looking for ways of vibration damping, which exceed the effectiveness of this measure.

From the DE 39 37 657 A1 a shaft rod is known, which is formed by a two-part aluminum profile body. The two aluminum profiles include a total of three hollow chambers between each other, one of which is filled by a foam body and the other two by a carbon fiber plastic composite. The carbon fiber plastic composite bodies have an approximately rectangular cross-section, which completely fills the respective hollow chamber. They are glued by an epoxy adhesive with the two side walls of the hollow chamber profile and with the adjacent webs thereof.

The accommodation of the carbon fiber plastic composite body in chambers closed on all sides, which are formed between the two matching aluminum profiles, requires a custom-fit adjustment of the two aluminum profiles to each other and to the carbon fiber plastic composite parts. This represents a considerable manufacturing complexity. In addition, the shaft rod has a not inconsiderable weight.

An also provided with an integrated stiffening shaft rod is from the DE 36 21 145 A1 known. The shaft rod is formed from two elongated, mating moldings, which together complete an interior space. This is filled with a stiffening element and a honeycomb element. The stiffening element is formed by a carbon fiber body.

The placement of the carbon fiber body in the closed interior not only encounters manufacturing difficulties but also leads to a considerable weight shank.

From the U.S. Patent 3,754,577 a shaft rod is known, which is designed as a hollow chamber profile. In an embodiment disclosed in the cited document, the shaft rod is provided at both its upper longitudinal edges and at its lower longitudinal edges with recesses in which stiffening elements having a rectangular cross-section are glued. While the hollow chamber profile is made of aluminum, the stiffening elements are formed of a glass fiber reinforced plastic.

Shaft rods of this design exhibit increased rigidity with respect to loads which are applied in directions of movement, i. act parallel to the side walls of the profile body. Vibrations acting transversely to the shaft profile, however, are less damped. In that regard, such a shaft rod is considered to be in need of improvement. This applies accordingly to the German utility model G 69 29 985, which discloses a similar shaft rod.

On this basis, it is an object of the invention to provide a heald, especially for high-speed weaving machines, which has higher dynamic stiffness and improved vibration characteristics.

This object is achieved with the weaving shaft according to claim 1:

The weaving shank according to the invention has at least one shaft rod, which is designed as a composite profile. It consists of an elongated, designed as a hollow profile body body, are held on the two stiffening body. The hollow profile body is formed, for example, by a light metal profile body, for example an aluminum extruded profile, while the stiffening bodies are preferably carbon fiber plastic composite rods. The peculiarity of the shaft rod consists in the arrangement of the stiffening body. These are housed in open chambers into which they can be inserted from the side. The chambers each have an open side, ie a correspondingly large lateral opening. On the one hand, this does not remove any material that carries along the base body, which reduces its weight, and, on the other hand, makes it possible to produce the basic body as a one-piece body. This, in turn, counteracts its rigidity. The main body has at least one, preferably a plurality of webs which connect the side walls of the hollow chamber profile with each other. The stiffening body rests either on such a web and is connected to this (eg glued) or it bridges the distance between the side walls cantilevered. It is also possible for one of the stiffening bodies to rest in a laterally open chamber against a web while the other stiffening body rests, for example, only with its ends on a web section. This results in a very good stiffening of the shaft rod with reduced shaft rod weight. The shaft rod according to the invention allows higher working speeds of the loom and shows a reduced tendency to oscillate.

In a preferred embodiment, at least one of the stiffening bodies, preferably the upper stiffening body does not extend over the entire length of the shaft rod but only over a part thereof. As a result, the end portions of the respective hollow chamber of the shaft rod are free, so that corner connectors can be used here, which serve for example for attaching the side supports. The introduction of corresponding forces in the ends of the shaft rod thus takes place over the consisting of aluminum or other metal body, for example, over the entire height of the respective side wall of the used hollow chamber. The stiffening body takes away no space for the corner connector, so that it can use the entire chamber cross-section.

By the lateral introduction of the stiffening body in the cavity in question, the stiffening body can be introduced in a short movement over the entire length almost simultaneously in the corresponding chamber of the shaft rod. This facilitates the production of uniform adhesive gaps compared to the axial introduction of a stiffening body into a cavity substantially. This makes it possible to achieve a high quality of the adhesive bond, which causes a good power transmission between the stiffening body and the light metal base body. The good power transmission benefits the rigidity and the vibration resistance.

In a preferred embodiment, portions of the sidewalls defining the stiffening body receiving chamber are removed, such that the stiffener body over a large part of its length protrudes out of the hollow chamber profile. Only the ends of the stiffening body and a lower portion thereof are then taken in the body. In this embodiment, with largely free stiffening body very high stiffness values are achieved at a reduced mass.

For example, the stiffening body is connected at its end with a web portion and / or a side wall portion. This is particularly advantageous in terms of the introduction of tensile forces in the stiffening body.

Figur 1

einen Webschaft in schematischer Darstellung,

Figur 2

einen Schaftstab des Webschafts nach Figur 1 in einer geschnittenen, perspektivischen Teilansicht,

Figur 3

den Schaftstab nach Figur 2 in einer ausschnittsweisen Draufsicht,

Figur 4

eine abgewandelte Ausführungsform eines Schaftstabs für den Webschaft nach Figur 1 in einer ausschnittsweisen geschnittenen perspektivischen Darstellung,

Figur 5

den Schaftstab nach Figur 4 in einer längs geschnittenen Teilansicht,

Figur 6

eine abgewandelte Ausführungsform des Schaftstabs für den Webschaft nach Figur 1 in einer geschnittenen, ausschnittsweisen, perspektivischen Ansicht,

Figur 7

eine weitere Ausführungsform eines Schaftstabs für den Webschaft nach Figur 1 in einer geschnittenen perspektivischen Teilansicht und

Figur 8

eine weiter abgewandelte Ausführungsform eines Schaftstabs für den Webschaft nach Figur 1 in einer geschnittenen perspektivischen Teilansicht.

Further details of advantageous embodiments of the invention are the subject of the drawing, the description or claims. Show it:

FIG. 1

a weave in a schematic representation,

FIG. 2

a shaft rod of the weave post FIG. 1 in a cut, perspective partial view,

FIG. 3

the shaft rod after FIG. 2 in a partial plan view,

FIG. 4

a modified embodiment of a shaft rod for the hive after FIG. 1 in a sectional cutaway perspective view,

FIG. 5

the shaft rod after FIG. 4 in a longitudinal sectional view,

FIG. 6

a modified embodiment of the shaft rod for the hive after FIG. 1 in a sectional, fragmentary, perspective view,

FIG. 7

a further embodiment of a shaft rod for the hive after FIG. 1 in a sectional perspective partial view and

FIG. 8

a further modified embodiment of a shaft rod for the heald after FIG. 1 in a sectional partial perspective view.

In FIG. 1 is a weaving 1 illustrated. This leads with its strands 2 in a weaving machine not further illustrated warp threads from a warp thread level up or down to each form a so-called compartment for entering weft threads. The heald comprises an upper and a lower shaft rod 3, 4, which are each provided with a Litzentragschiene 5, 6. On these, the strands 2 are each held with their end eyelets with little vertical play. The shaft rods are end connected by side supports 7, 8 with each other. The shaft rods 3, 4 can be constructed in the same way. The following description of different embodiments of the shaft rod 3 therefore applies correspondingly to the shaft rod 4.

The shaft rod 3 is in FIG. 2 separately illustrated. It has a hollow body formed as elongated base body 9, which is formed for example as a one-piece ie one-piece light metal body, for example in the form of an aluminum extruded profile. The main body 9 has two substantially planar side walls 11, 12, which are arranged at a distance parallel to each other and flat sides of the shaft rod 3 form. The base body 9 contains two but preferably a plurality of chambers 14, 15, 16, 17, which are separated from each other by webs 18, 19, 20. The webs extend on the shaft rod 3 in the longitudinal direction, they are parallel to each other and preferably at right angles to the side walls 11, 12 aligned. The side wall 11 is extended over a the chamber 14 downwardly delimiting web 21 out and contributes to a retaining rib 22, the heddle support rail 5. The limited between the webs 18, 21 and the side wall 11 chamber 14 preferably at full height, which is measured as a distance between the webs 18, 21, laterally open. It has a slot-like opening 23 which extends over the entire length of the shaft rod 3 and whose opening direction is oriented perpendicular to the side wall 12.

In the chamber 14, a stiffening body 24 is arranged, whose cross section with the cross section of the chamber 14 approximately matches. The stiffening body 24 is preferably a carbon fiber reinforced plastic body (CFRP body) with a square or rectangular cross-section. Its length coincides with the length of the base body 9. The stiffening body 24 is glued to the base body 9 at least at its ends, but preferably over its entire length. The adhesive bond is preferably trihedral, i. the stiffening body 24 is glued to the web 18, with the side wall 11 and with the web 21. It is preferably adhered to a bonding gap between 0.1 mm and 0.3 mm. For dimensional compliance with the adhesive gap 9 protrusions may preferably be formed in the form of ribs on the stiffening body 24 and / or on the surfaces of the base body facing the stiffening body 24. The dimensions of the ribs correspond to the adhesive gap and extend parallel to the base body 9 over the entire length of the adhesive surface. It is also possible to apply the adhesive to spacer bodies, e.g. small glass spheres of substantially uniform size, which then define the minimum bond gap thickness.

In a modified embodiment, the stiffening body is glued only to the web 18 and the web 21, but not with the side wall 11. The webs 18, 21 are subjected to a vibration load of the shaft rod 3 to train and pressure. They are interconnected by the stiffening body 24. Their own thickness is substantially lower than that of the web 19. However, the unit formed by the webs 18, 21 and the stiffening body 24 is significantly thicker overall than the web 19.

The chambers 15, 16 are preferably empty, but may have suitable filling material in certain applications. The chamber 17 is provided with a further stiffening body 25. This is again designed as a carbon fiber plastic body and it has a square or rectangular cross-section. Unlike the chamber 14, which is closed on three sides and only open on one side, the chamber 17 is preferably opened much more generous. On two sides, it is bounded by the side wall 12 and by the web 20. At the top, the chamber 17 is open. At the upper edge 26, no web or the like connects. Optionally, however, such a web may be provided on end regions 27 of the shaft rod 3 as part of the contour of the extruded profile forming the base body 9. An end portion 27, in which such a web is present extends from the end of the stiffening body 25 to the end of the shaft rod. The stiffening body 25 preferably does not extend over the entire length of the shaft rod 3 such as for example FIG. 3 evident. In the end region 27 of the shaft rod 3, the chamber 17 is closed. It consists of the webs 20, 32 and the side walls 11 and 12. In this case, the side wall 11 extends to the same height with the side wall 12. Preferably, the chamber 17 is empty in these end regions. The web 32 and the side wall 11 run in the direction of the stiffening body 25 in a wedge portion 28 and release the chamber 17 laterally. Between the end remaining residues of the side wall 11, in the region of the stiffening body 25, the chamber 17 is thus not only upwards but also laterally open.

Accordingly, the stiffening body 25 has a wedge-shaped end portion 29 whose wedge angle coincides with the wedge angle of the wedge portion 28. The wedge angle is preferably between one and five, preferably two and three degrees. The stiffening body 25 is glued to the base body 9. In particular, it is connected on its underside to the web 20 and on its side wall 12 facing side with the side wall 12. In addition, the end of its end portion 29 is glued to the wedge portion 28 of the web 32 and the side wall 11. Thus, the chamber 17 in the end regions of the shaft rod 3 for stiffening the shaft rod 3 with respect to the upward deflection, which leads to the stiffening body 25 to a tensile load, used for stiffening.

The end portion 29 may, as shown, be continuous wedge-shaped or have one or more stages. He has at its adjoining the side wall 11 side a length which deviates from the length of its adjoining the side wall 12 side surface 31. By appropriate design of the difference in length, the vibration excitation of the shaft rod 3 in the lateral direction (perpendicular to the side surfaces 11, 12) starting from a vibration load in the vertical direction (parallel to the side surfaces 11, 12) regulated and adjusted as desired.

The chambers 15, 16 and, if necessary, the chamber 17 can serve to receive Eckverbindungsstücken to which the side supports 7, 8 are connected. The initiation of the outgoing of the side supports 7, 8 forces thus takes place at the ends of the shaft rod 3 in the base body. 9

The heald shaft 1 described so far is subject at work a relatively strong bending load. The driving forces are introduced via the side supports 7, 8 in the ends of the shaft rod 3. At the heald bar 5 hang the strands and with these the warp threads. Due to the weight of the strands and the warp threads and the acceleration forces occurring during the up and down movement, considerable vertical forces act on the heddle support rail 5 parallel to the side supports 7, 8, which lead to a bending load of the shaft rod 3. The bending load occurs for the stiffening body 24, 25 as tensile and compressive load in appearance. The web 19 is preferably arranged in the neutral fiber, it is subject to neither a tensile nor a compressive load. The tensile and compressive stresses are transmitted to the stiffening bodies 24, 25 via the relevant adhesive gaps. Here, in particular, the connection to the webs 18, 20 is force-transmitting. The introduction of force into the stiffening bodies 24, 25 preferably takes place symmetrically. The additional asymmetrical connection of the stiffening body 24 to the side wall 11 and the stiffening body 25 and the side wall 12 can be used specifically for further vibration compensation, in particular for eliminating vibrations along the Kettfadenrichtung.

In FIG. 4 a modified embodiment of the shaft rod 3 is illustrated. As far as the same reference numerals are used, reference is made to the above description. In addition to this, the following applies:

The web 20 is omitted in this embodiment completely, ie the chamber 16 extends from the web 19 to a provided on the upper side of the shaft rod 3 web 32. This is perpendicular to the side surfaces 11, 12 oriented and only in the end portion 27 of Shaft rod 3 available. Incidentally, it is removed, for example, by a subsequent machining of the main body 9. Thus, the chamber 16 is open at the entire width upwards. It has a slot-like rectangular opening 33. As FIG. 5 illustrated is integrally formed with the side walls 11, 12 web 32 at its end preferably provided with a wedge portion 34. With the wedge portion of the wedge-shaped at its end also stiffening body 25 is connected via an adhesive joint 35. In addition, the stiffening body 25 is bonded at its flanks with the side walls 11, 12. This can be done throughout the entire length. In some cases, however, it is also sufficient to connect the stiffening body 25 only at its ends with the wedge portion 34 and with the side walls 11, 12. Optionally, additional joints may be distributed over its entire length.

Such a shaft rod offers a particularly high rigidity.

FIG. 6 illustrates a further modified embodiment of the shaft rod 3. This is based essentially on the embodiment according to FIG. 4 , In addition to these statements, the following applies:

Like the shaft rod 3 after FIG. 4 the shaft rod 3 yields FIG. 6 only three chambers 14, 15, 16, wherein the upper chamber 16 receives the upper stiffening body 25. The upper side wall 11 is only present in the end region 27. Incidentally, it is removed approximately to half the height of the stiffening body 25. This leads to a weight reduction of the shaft rod 3 without noticeable or relevant reduction of its rigidity. Due to the asymmetry between the side walls 11, 12 in the upper end region, the vibration excitation in the warp thread longitudinal direction can be controlled and minimized. It is also possible to shorten both side walls 11, 12 outside the end portion 27, such as FIG. 7 illustrated. The side walls 11, 12 can, as illustrated, end at the same height or at different heights. As in the embodiment according to FIG. 6 However, the upper chamber 16 is closed in the end region 27. The web 32 and the side walls 11, 12 are completely present in the end region 27. The web 32 forms a self-supporting wedge-shaped tongue, which goes parallel to the web 19 on the stiffening body so that it is enclosed in its end region. Introduced into the chamber 16 Eckverbinderstücke for connecting the side supports 7, 8 thus find four chamber walls for support and to the plant before. It is a total of a simple and well-structured relatively light and especially reliable to produce produced lighter and very stiff shaft rod created.

Another modified embodiment of the invention is based FIG. 8 out. In contrast to the above embodiments of the shaft rods 3 here serves the chamber 15 for receiving the stiffening body 24. The chamber 15 is opened here through an opening 36 downwards.

A loom for a weaving machine has a shaft rod 3, which consists of an integrally formed light metal profile and two stiffening bodies 24, 25 bonded thereto. The stiffening bodies bridge the entire width of the shaft rod 3, wherein the width between its side walls 11, 12 is measured. The chambers 14, 16 for receiving the stiffening bodies 24, 25 each have at least one open side, through which the stiffening body is visible from the outside and can be introduced into the respective chamber 14, 16. This facilitates the production. In addition, both a stiffening in the direction of work and a good stiffening in the transverse direction is achieved.

LIST OF REFERENCE NUMBERS

1

heald

2

strands

3, 4

stave

5, 6

shaft stave

7, 8

side supports

9

body

11, 12

side walls

14, 15, 16, 17

chambers

18, 19, 20

Stege

21

web

22

holding rib

23

opening

24, 25

strengthening member

26

edge

27

end

28

wedge portion

29

end

31

side surface

32

web

33

opening

34

wedge portion

35

bonded joint

36

opening

Claims (10)

1. Heald frame (1) for looms, in particular for high-speed looms,
   with an elongated base body (9) configured as a hollow profile body having two side walls (11, 12) connected to one another by a web (18, 19, 20), and has at least a first chamber (14) and at least a second chamber (16 or 17), which are respectively open to at least one longitudinal side,
   and which body has either at least one further chamber (15, 16), which is delimited by the two side walls (11, 12) and by the web (18, 20) and a further web (19) arranged between the side walls (11, 12), or at which the second chamber (16) is closed by the web (19) and a further web (32) between the two side walls (11, 12) in an end section (27),
   with a first reinforcing body (24), which occupies the width of the base body (9), is arranged in the first chamber (14) and is adhered to the base body (9) on at least two sides, and
   with a second reinforcing body (25), which occupies the width of the base body (9), is arranged in the second chamber (17) and is adhered to the base body (9) on at least two sides,
   wherein the reinforcing body is visible from the outside through the at least one respective open longitudinal side and can be inserted into the respective chamber (14, 16).
2. Heald frame according to claim 1, characterised in that the base body (9) is composed of an aluminium profile.
3. Heald frame according to claim 1, characterised in that the base body (9) is configured in one piece.
4. Heald frame according to claim 1, characterised in that the reinforcing bodies (24, 25) are made from a carbon fibre composite material.
5. Heald frame according to claim 1, characterised in that the reinforcing bodies (24, 25) are respectively connected to a web (18, 20) over the entire width.
6. Heald frame according to claim 1, characterised in that the reinforcing bodies (24, 25) are rectangular in configuration.
7. Heald frame according to claim 1, characterised in that at least one of the chambers (14) has an insertion slot (23), the direction of opening of which is oriented at right angles to one of the side walls (11, 12).
8. Heald frame according to claim 1, characterised in that one of the chambers (17) has an insertion slot, the direction of opening of which is oriented parallel to the side walls (11, 12).
9. Heald frame according to claim 1, characterised in that at least one of the reinforcing bodies (25) has at least one wedge-shaped end.
10. Heald frame according to claim 9, characterised in that a web (32) adjacent to the reinforcing body (25) is interrupted by a passage (33) closed by the reinforcing body (25), wherein the remaining web ends (28) are wedge-shaped in configuration, and that the wedge-shaped end of the reinforcing body (25) is connected to the web ends (28).

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