EP1600543A1 - Warp-knitting implement mounting bar - Google Patents

Abstract

The body comprises at least two open profiles (10, 11) which are joined together. They are pressed components lying flat together at the bonding surfaces (22, 29), which are adhered together. In the hollow cavity (12, 34) of the profiles, auxiliary fastenings (20, 40, 51, 61) are located in an overlapping region; they are adhered-in. External grooves (67) run transversely with respect to the length of the profile, with intervening wavy bridging sections (69). A common longitudinal groove (64) connects the transverse grooves, arranged in an additional section (63) located on the exterior of a profile (58). The profiles are formed from unidirectional- (UD-) prepregs. At least two prepregs are laid on each other, preferably with the fibers directed longitudinally and transversely. The body has a greater proportion of fiber than the prepreg. At least one profile is curved in section. At least one has an angled reinforcing strip (28, 44, 48, 49) standing away from the cavity. The profile shapes can only be laid together in a unique orientation.

Description

The invention relates to a knitting tool Barre one Knitting machine with a fiber-reinforced plastic having body which with walls a cavity surrounds, which extends in the longitudinal direction.

Knitting machines have several bars, knitting tools wear. Under "impact tools" become simplicity half of all elements summarized, the knitting process involved, for example, knitting needles, hole needles, Milling plates, pole plates, deburring plates, etc.

A barre can extend over a relatively long length, for example, over the entire length of a Knitting machine. In individual cases it can be a length in reach the order of about 6 m. Even with shorter ones Lengths you put certain demands on the mechanical stability of the bar. In particular, should Barre have a certain rigidity and not swing. On the other hand, you want the mass of the barre keep as low as possible, because every single cycle Knitting machine must be accelerated. The smaller the Mass is, the smaller are those to accelerate necessary forces and the higher the working speed be the knitting machine.

Usually, the bars of a knitting machine are off a light metal, such as magnesium or aluminum formed. These materials are relatively light. A Barre made from it, however, still has a considerable amount Dimensions. It has therefore, for example, in DE 38 40 531 C1 proposed to strengthen the barre To form plastic. For this purpose, the barre a hollow profile with a cavity on the round of largely closed peripheral walls is limited. Outside the hollow profile are two fastening profiles molded, which for clamping fastening of retaining arms or serve from Nadelbleien.

With such a design of the bar can be Although a relatively low mass and a higher mechanical Achieve resilience. The resilience is however limited.

In DE 41 11 108 C2 has proposed a barre made of reinforced plastic by adding the Hollow profile of flat overlapping superimposed Plastic bands with one reinforcing thread each knitted or woven mat forms. in the Cavity is arranged a shaped body, in the long run remains in the cavity and for attachment of components Contains female thread pieces.

However, such a design has the disadvantage that due to the molded body, the mass increases again. About that In addition, the nut thread pieces must be relatively accurate be positioned in advance. An afterthought Changing the position is practically impossible.

The invention is based on the object, a Barre with low mass and high mechanical stability specify.

This task is at a bar of the aforementioned Art solved by the fact that the body of at least composed of two open profiles.

An open profile is a profile that comes from all sides is accessible from. The corpus thus arises only through that you put the profiles together. It arises also only the cavity. This has the consequence that the profiles before assembly from all sides, so also from their inside, are freely accessible, so that you have a great variety of editing before assembling the profiles. Thereby For example, you save the need to purely for precautionary reasons nut threaded pieces on To place positions at which they later at all are not necessary. You do not need any superfluous Material areas on the body, which you possibly would have to accept, if the corpus directly manufactured as a hollow profile, for example by Extrusion.

Preferably, at least one profile is a pressed part educated. One can observe that the "firmness" at least within certain limits with the power rises, with which a profile is pressed. If you now The body of profiles composed, then you can at least one profile, but preferably all profiles, thereby producing in a high strength manner she makes in a press. In a press you can control the required pressure and apply as this is required. For a body that is a closed one Hollow profile, this could only be achieve by introducing a core. at However, it is extraordinary for larger lengths of the body difficult to remove the core again. The Alternative is to use the core in the body leave (DE 41 11 108 C2). However, this leads to a increased mass.

Preferably, the profiles have at least one connection surface on, in which they lie flat against each other. About connecting surfaces can be a relative provide large contact area over which a connection between two or more profiles with sufficient Reliability can be done.

It is preferred that the profiles glued together are. Due to the fact that the bonding is extensive is done over the connecting surfaces, also results a very low end strength adhesive high holding power.

It is also advantageous that at least one profile in Cavity provided with a fastening aid is. The fastening aid element can be attached to the profile before the profiles are put together. So you do not have this fixing aid yet take into account in the production of the profile. Much more It can be attached to the inside of the profile later bounded the cavity, attached and fixed there if this inner side is still freely accessible.

It is preferred that the fastening aid element is arranged in an area where two profiles overlap each other. This embodiment has several Advantages. For one, the strength of the body is in an area where two profiles are superimposed, extraordinary big. On the other hand you can then the fixing aid element not just to use attachments, For example, Nadelbleie or the like, at the bar to fix. You can the fixing aid element at the same time use the connection between ensure or reinforce two profiles.

Preferably, the fastening aid element is glued. This measure is mainly for the production the barre makes sense. When the fastening aid element attached to the inside of the profile, then retains It also contributes to its position during assembly. When Befestigungshilfselement can be, for example, a Use nut that provides a thread into that later a bolt can be screwed. Naturally In this case you will get a hole through the profile or to make the profiles.

Preferably, a profile has on its outside transversely extending to the longitudinal grooves, between which wave-shaped webs are arranged. The grooves serve for receiving needles, such as knitting needles. The webs support the needles in the longitudinal direction against each other and then define a distance between adjacent ones Needles. Characterized in that the webs wavy run, increased strength is provided. Since the profiles made of fiber-reinforced plastic, for example formed carbon fiber reinforced plastic are reached by the wave, which basically only a "mountain" that at least a part of the fibers into a part of the profile, in the grooves have not yet penetrated. The bridges then have increased resistance to damage on.

Preferably, the grooves close to a common longitudinally extending longitudinal groove, the arranged in an additional profile, on an outside of the cavity side of a profile is arranged. The longitudinal groove serves, for example, To take projections of knitting needles with which the Throwing pins in the longitudinal direction opposite a knitting needle bar be fixed. By having the longitudinal groove does not fit into the profile that encloses the cavity, one avoids a weakening of the corpus. The Barre remains extremely stable and still can their function, the needles, for example here the To keep knitting needles, to perform well.

Preferably, at least one profile is made of a prepreg educated. A prepreg is a semi-finished product in which fibers, For example, carbon fibers, and plastic in one predetermined ratio are mixed. in this connection the fibers are already in a predetermined way and Way arranged inside the plastic. Plastic forms a matrix reinforced by the fibers becomes. Prepregs are for example in the form of Mats before, which can be inserted in a press. With The help of a prepreg usually gives you a better one Distribution of the fibers in the plastic matrix as with an addition of plastic during the pressing process. After the pressing process, often with heat is fed, the prepreg can cure and then keep its final shape. Protruding parts of the Prepregs that are not needed, you can at Pressing or punching afterwards or in a separate Saw off or cut off the machining process.

It is preferred that the prepreg is a UD prepreg is educated. In a UD prepreg (UD stands for unidirectional) running fibers practically exclusively in one direction. In this direction has then the profile formed from the prepreg increased tensile strength. By choosing the fiber direction you have So a significant influence on the strength the barre.

Preferably, the profile of at least two successive lying prepregs formed whose fiber directions include a predetermined angle. This Angle can be for example 90 °. In this case you have an elevated train in virtually all directions Crush resistance.

Preferably, at least one prepreg has a fiber direction on, which runs in the longitudinal direction, and at least a prepreg has a fiber direction which transverse to the longitudinal direction. Especially at one Barre wearing guide needles is one such embodiment advantageous. Such a barre is at a Cycle both longitudinally reciprocated as well as across the longitudinal direction. In both directions The fibers of the prepregs provide sufficient strength. Through the targeted alignment of the prepregs the barre is kept dimensionally stable in all fiber directions, i.e. neither longitudinal nor transverse thereto a change of dimensions depending on the Temperature.

It is preferred that at least at an outer Surface of the profile is a prepreg with a fiber direction is arranged, which extends transversely to the longitudinal direction. This is especially related to the above with the knitting needle mentioned grooves of advantage because then the intervening bridges at least on its surface and an underlying one Layer fibers have the direction of the webs consequences. As a result, the strength of the webs considerably elevated.

Preferably, the body has a higher fiber content as the prepreg on. This can be done by that one in producing at least one profile Pressing force that ensures that a part of the Plastic is pushed out of the press. you This can also make it easier by having one for one Pressing prepared prepreg into a piece of textile Wrapping fabric. This will make the plastic faster on the surface and over this to the edge of the prepreg guided. For example, if the prepreg a Fiber content of 60%, then you can through the higher compressive force the body with a fiber content of 70% provided.

Preferably, at least one profile has a curved one Section on. A vaulted section opposite a flat section increased strength. A curved section can be by a pressing operation produce.

It is also advantageous if at least one profile has one Angled reinforcing strip, which from the cavity is gone. This reinforcing bar can be easily accommodate where in the knitting machine space is available. The reinforcement bar can also used to position the barre in to facilitate the knitting machine. Such a reinforcing strip settles when molding in a press easy to mold.

In a preferred embodiment it is provided that the profiles have a shape with which they only in one single orientation can be applied to each other. The Profiles are then self-centering, i. E. she fit only in one orientation to each other. Such Shape can be achieved, for example, by that you have the profiles with matching curves or tabs.

Fig. 1

eine schematische Darstellung eines Wirkbereichs einer Kettenwirkmaschine,

Fig. 2

eine schematische Darstellung einer Preßform zum Herstellen eines offenen Profils,

Fig. 3

ein Profil einer Legebarre,

Fig. 4

eine aus zwei Profilen zusammengesetzte Legebarre,

Fig. 5a

eine Nadelbarre,

Fig. 5b

einen vergrößerten Ausschnitt aus Fig. 5a,

Fig. 6a

eine perspektivische Darstellung einer Nadelbarre und

Fig. 6b

eine vergrößerte Darstellung eines Teils der Nadelbarre nach Fig. 6a.

The invention will be described below with reference to preferred embodiments in conjunction with the drawings. Herein show:

Fig. 1

a schematic representation of an effective range of a warp knitting machine,

Fig. 2

a schematic representation of a mold for producing an open profile,

Fig. 3

a profile of a guide bar,

Fig. 4

a guide bar composed of two profiles,

Fig. 5a

a needle bar,

Fig. 5b

an enlarged detail of Fig. 5a,

Fig. 6a

a perspective view of a needle bar and

Fig. 6b

an enlarged view of a portion of the needle bar of FIG. 6a.

Fig. 1 shows several knitting tools of a knitting machine namely guide bars 1a-1d, a board bar 2, a Slide bar 3 and a needle bar 4. The guide bar 1a-1d carry guide needles 5, which via a holder 6, the can also be referred to as Nadelblei, on the guide bar 1a-1d are attached. The board bar 2 carries Blanks 7. The slide bar 3 carries slide 8 and the needle bar 4 carries knitting needles. 9

A guide bar 1a has a body consisting of two Profiles 10, 11 is composed. The two profiles 10, 11 surround a cavity 12 which is perpendicular extends to the drawing plane. The direction perpendicular to Drawing plane is hereinafter referred to as "longitudinal direction", because they are with the longitudinal direction of the knitting machine coincides, the effective range shown in Fig. 1 is.

Fig. 2 shows a press mold 13, for producing the Profiles 11. The press mold has a top 14 and a lower part 15, which in Fig. 2 is slightly offset from one another are shown to point to the profile 11 can.

The profile 11 is made of at least two, preferably formed three UD prepregs whose fibers are longitudinal or run across it. To create the profile 11 will be superimposed and in the right one Size brought UD prepreg inserted into the press mold 13. Upper part 14 and lower part 15 are with a predetermined force moves towards each other to the profile 11 to get in shape. If necessary, too Heat are supplied. After curing the prepregs one obtains the profile 11 in the desired shape. border areas 16, 17, which are superfluous, can by sawing or punching away.

The profile 11 (the same applies to all other profiles Also) is designed as an open profile, i. both Pages of profile 11 are fully accessible.

Fig. 3 now shows the profile 11 with punched holes 18, 19 and a fixing aid 20. The Fixing aid element 20 is glued to a web 21, the on its outside a connecting surface 22, with the profile 11 with the profile 10th can be connected, for example by gluing. The fastening aid element 20 has 19 for each hole a threaded hole 23, in the later a bolt for fixing the guide bar 1a to a not closer lever (or other carrier) can be screwed.

Similarly, in the holes 18 are threaded inserts 24 used, in which a bolt 25 is screwed can be to the holder 6 of the guide needles 5 at the Legebarre to fix 1a.

The other profile 10 is in principle the same as the profile 11 built. It has one at its upper end Web 26, which is provided with an opening 27. Of the The bridge has an angled reinforcing strip 28, for example, an angle of 90 ° to the web 26th includes. The reinforcing strip 28 points from the cavity 12 away. It gives the Legebarre 1a a relative great rigidity in the longitudinal direction, but disturbs not further, because they are in the assembled state the bolt is adjacent, which passed through the threaded hole 23 is.

The guide bar 1d is even designed so that the two Profiles 10 ', 11' are formed equal, i. you can use the same profiles 10 ', 11' and one around Fold 180 ° to form the guide bar 1d. Usually but you will be in a knitting machine same Legebarren use.

The profile 11 has at the web 21 opposite Side an extension 29 on, which is also a Connecting surface 30 forms. The extension 29 is located in assembled state (Fig. 1 and 4) at a corresponding Extension 31 of the profile 11 at.

To complete the guide bar 1d, the two Profiles 10, 11 produced in the press mold 13. The Holes 18, 19 are also made, for example by drilling or punching. After that, the two Profiles 10, 11 assembled and at the connecting surfaces 22, 30 interconnected. This connection can be done for example by gluing. There the bonding over a large area over the entire bar length done, you can also use a glue with low final strength use and still a very high holding power to reach. In addition, the superimposed Webs 21, 26 and extensions 29, 31 and for the Screwing the active elements or for attachment the barre are used. With appropriate screwing the bond is insignificant, so that if necessary even they can be dispensed with.

The board bar 2 also has two profiles 32, 33, which enclose a cavity 34. The profiles 32, 33 lie in sections 35, 36 and 37, 38 to each other and can be connected there. By the Sections 35, 36 a bolt 39 is guided, which in a Nut 40 is screwed in, which is on the inside of the section 35 is fixed, for example by Glue. The bolt 39 not only holds the board bar 2 fixed to a bracket 41, he also provides a connection between the two profiles 32, 33 sure.

In a similar manner as with the guide bars 1a-1d guided through the sections 37, 38 a threaded insert 42, in which a bolt 43 is screwed. The bolt 43 holds on the one hand the boards 7, on the other hand connects but also the two profiles 32, 33.

Again, the section 36 has a reinforcing strip 44, which is angled approximately at right angles to the section 36 is and thus points away from the cavity 34.

The slide bar 3 is made of two profiles 45, 46th assembled, which surround a cavity 47. Here Both profiles 45, 46 each have a reinforcing strip 48, 49 on, with the two profiles 45, 46 on the reinforcing strips 48, 49 abut flat against each other. The reinforcing bar 48 is a section 50 of the lower profile 46 bent approximately at right angles. A nut 51 is on the inside of the profile 46 glued on.

The profile 45 has two bent sections 52, 53 on. Curved sections convey the profile in Longitudinal increased rigidity. Also the profile 46 has a bent portion 54, wherein the bent portions 53 and 54 abut each other. There, the two profiles 45, 46 glued together be.

Beyond the connecting surfaces, which are at the curved Sections 53, 54 are formed, form the two Profiles 45, 46 Klemmarme 55, 56, between which slide 8 are clamped with their holders. Naturally the slide 8 can also be secured with a screw be.

FIGS. 5 and 6 now show the needle bar 4 with further Details. The needle bar initially has two Profiles 57, 58, attached to their angled reinforcing strips 59, 60 are interconnected. On the Inside the profile 57, a nut 61 is glued. The nut is accessible through an opening 62, so that the needle bar 4 at a not shown Carrier can be attached.

On the outside of the profile 58 is another profile 63, which is shown enlarged in Fig. 5b is. The profile 63 forms a longitudinal groove 64, in a projection 65 of each needle 9 engages to to fix the needle 9 in the direction of movement via slide.

All three profiles 57, 58, 63 are of three layers constructed, as can be seen from Fig. 5b. The layers are labeled "-1", "-2" and "-3". each Layer is formed by a prepreg, so a semi-finished, in which fibers, in particular carbon fibers, in one Embedded plastic matrix. In the present case are the prepregs as UD prepregs (unidirectional prepregs) formed, i. the fibers are all in one Direction aligned. For the production are several Prepregs, in the present case three, stacked and then in a form similar to that shown in FIG pressed together. The prepregs are doing this with different orientations of their fibers put on each other. The respective outer layers 58-1 and 58-3 and 63-1 and 63-3 are aligned that their fibers are parallel to the drawing plane, so (in the undeformed state of the prepregs) parallel to the Direction of the knitting needles 9. Prepreg 58-2 and the Prepreg 63-2, however, are aligned so that their Fibers are in the longitudinal direction.

The same applies to the prepregs of layers 57-1 to 57-3.

If now the profiles 58, 63 in a corresponding Press are formed, then they form, like this Fig. 6b can be seen, a shaft 66, wherein the fibers the layer 63-3 in a plane parallel to the Punches 9 are. After shaping the profile 63 not only the longitudinal groove 64 is milled, this Longitudinal groove 64 only the two upper layers 63-1, 63-2 penetrates, but also grooves 67 are made, in the later knitting needles 9 are arranged can. The remaining lands 68 then become formed by fibers of the outer layer 63-3, consisting of emerge from the "underground" and back into the "underground" immerse so that the outer layer of the shaft 66 practically formed by a continuous fiber structure is anchored at the ends of the fibers, so are not free. This contributes significantly to the stability the waves 66 at. Similar considerations apply to the webs 68. Their fibers are at least one side in Underground.

The knitting needles 9 are using a bracket 69 in held the grooves 67. The bracket 69 is using a clamping piece 70 held on the needle bar 4, wherein the clamping piece 70 by a screw 71 on the Needle bar 4 is fixed, in a threaded piece 72nd is screwed through the two profiles 58, 63 is guided. Moreover, the profiles 57, 58, 63 in glued to each other in the present embodiment.

In producing the profiles 10, 11, 32, 33, 45, 46, 57, 58, 63 put the UD prepregs into a special one each designed press mold and acts on the Press mold then with pressure and possibly also increased Temperature. You can choose the pressure so high that part of the plastic of the plastic matrix is squeezed out of the mold. You get it Profiles in which the fiber content is greater than that Fiber content of the prepregs. This will increase the strength the barre enlarged later from these profiles is formed. However, not too much plastic be removed from the profiles. You can push that out the plastic even easier by that wrapping the prepregs in a textile fabric, which then dissipates the plastic to the outside.

The individual profiles can still be processed after pressing become. For example, you can click on the sawn or cut to the correct length. Parallel to the longitudinal direction protruding parts can also be cut off or punched. Preferably you can train the profiles of a barre so that they only laid out in mutual alignment can be, for example, based on the Slider 3 through the curved portions 53, 54th and the reinforcing bars 48, 49 is shown.

Claims (18)

A working tool bar (1a, 1b, 1c, 1d, 2, 3, 4) of a knitting machine comprising a fiber reinforced plastic body surrounding a cavity (12, 34) with walls extending longitudinally, characterized in that the body is composed of at least two open profiles (10, 11; 10 ', 11'; 32, 33; 45, 46; 57, 58, 63). Bar according to claim 1, characterized in that at least one profile (10, 11; 10 ', 11'; 32, 33; 45, 46; 57, 58, 63) is formed as a pressed part. A bar according to claim 1 or 2, characterized in that the profiles (10, 11; 10 ', 11'; 32, 33; 45, 46; 57, 58, 63) have at least one connecting surface (22, 29) in which they lie flat against each other. Bar according to one of claims 1 to 3, characterized in that the profiles (10, 11; 10 ', 11'; 32, 33; 45, 46; 57, 58, 63) are glued together. Bar according to one of claims 1 to 4, characterized in that at least one profile (10, 11; 10 ', 11'; 32, 33; 45, 46; 57, 58, 63) in the cavity (12, 34) with a Fixing auxiliary element (20, 40, 51, 61) is provided. A bar according to claim 5, characterized in that the auxiliary fixing element (20, 40, 51, 61) is arranged in a region in which two profiles (10, 11; 10 ', 11'; 32, 33; 45, 46; 57 , 58, 63) overlap each other. Bar according to claim 5 or 6, characterized in that the fastening auxiliary element (20, 40, 51, 61) is glued. Bar according to one of claims 1 to 7, characterized in that a profile (58, 63) on its outer side transversely to the longitudinal direction extending grooves (67), between which wave-shaped webs (68) are arranged. A bar according to claim 8, characterized in that adjoining the grooves (67) is a common longitudinal groove (64) extending in the longitudinal direction, arranged in an additional profile (63) on a side of a profile (58) located outside the cavity. is arranged. Bar according to one of claims 1 to 9, characterized in that at least one profile (10, 11; 10 ', 11'; 32, 33; 45, 46; 57, 58, 63) consists of a prepreg (57-1, 57 -2, 57-3, 58-1, 58-2, 58-3, 63-1, 63-2, 63-3). Bar according to Claim 10, characterized in that the prepreg (57-1, 57-2, 57-3; 58-1, 58-2, 58-3; 63-1, 63-2, 63-3) is in the form of UD -Prepreg is trained. Bar according to claim 11, characterized in that the profile (10, 11; 10 ', 11'; 32, 33; 45, 46; 57, 58, 63) consists of at least two superimposed prepregs (57-1, 57-2 , 57-3, 58-1, 58-2, 58-3, 63-1, 63-2, 63-3) whose fiber directions include a predetermined angle. Bar according to claim 12, characterized in that at least one prepreg (57-2, 58-2, 63-2) has a fiber direction extending in the longitudinal direction and at least one prepreg (57-1, 57-3, 58-1 , 58-3; 63-1, 63-3) has a fiber direction that is transverse to the longitudinal direction. Bar according to claim 13, characterized in that at least on an outer surface of the profile (63) a prepreg (63-1) is arranged with a fiber direction which is transverse to the longitudinal direction. Bar according to one of claims 10 to 14, characterized in that the body has a higher fiber content than the prepreg. Bar according to one of claims 1 to 15, characterized in that at least one profile (10 ', 11'; 32, 33; 45, 46; 57, 58, 63) has a curved section. Bar according to one of claims 1 to 16, characterized in that at least one profile (10, 11; 10 ', 11'; 32, 33; 45, 46; 57, 58, 63) has an angled reinforcing strip (28, 44, 48 , 49) which is away from the cavity. Bar according to one of claims 1 to 17, characterized in that the profiles (45, 46) have a shape (53, 54) with which they can be placed against each other only in a single orientation.

Images