DE19920659C1 - Mechanism to form a leno selvage has carrier cams at the lifting healds to move the doups under control without external components for positive doup movements at high heald movement speeds - Google Patents

Abstract

The mechanism to form a leno selvage has projecting carrier cams (7,8) at the lifting healds (10,20) near the doups (3). They work in a positive fit with limits (30) at the doups (3). Systems are at the lifting healds (10), near the doup head (HK), to move the doup (3) to opposite sides on the up and down movements of the lifting healds (10). Spaces (42,43) for the doup feet (HF) are at the wall of the slit-shaped holding zone (40,41) near the carrier cams (7,8). The upper wall limit (44,45) of the spaces work with a shoulder (46,47) of the doup (3). The lower end of the doup (3) is closed to form the doup foot (HF) in a swallowtail shape. Wear-resistant slides for the leno yarn are at the lifting healds (10,20). Locking limit stops (11) grip through the zone of the doup (3) formed by the legs (5-6). Control cams are at the doup foot (HF) zones.

Description

The invention relates to an apparatus for forming a leno edge by means of reciprocating heald frames according to the preamble of the main claim.

From the generic DE 296 04 451 U1 is a Hebelit zenanordnung become known, in which the half strands in the loading rich of the half-strand foot is fork-shaped and the lifting strands magnets are provided, which are made with the existing magnetic half wire together ken, such that the half strands during the up and down movement of the Lever strands are taken over the magnets.

In the area of the guide opening in the lifting healds, through which the half strand is guided, control cams are provided, which cause the half strands from one lifting strand to the on whose lifting wire can change.

The invention is based, to control the task Up and down movement of the half strands without the help of magnets inevitably reached, so despite that today is getting higher increasing number of strokes of the heald frames a safe carry and return of the half strands in the lifting strands guaranteed is.

This object of the invention is achieved by Teaching of the main claim solved.

Advantageous embodiments of the invention are in the Unteran sayings explained.  

In other words, it is proposed that in lower area of the lifting strands in the area of the half strands jumping driver cams are provided, the positive sig with the half-strand, in the area of the half-strand foot ßes, arranged stops interact and thereby the half strands with the up and down movement of the lifting strands to take

This arrangement ensures a safe guidance of the half strands both in the up and down direction as well as in the transverse direction direction reached. At the same time, the half strands from the different materials are manufactured, d. H. it no magnetically active material has to be used. So z. B. used a plasma-coated aluminum be, thereby reducing the acceleration Masses is reached.

According to a preferred embodiment of the invention the half heald foot is dovetailed and the provided in the area of the half strand foot on the lifting strand Stops are to the dovetail half heald foot complementary. Through this training when lifting the half strand through the lifting strand one already Movement of the half strand perpendicular to the lifting movement of the lifting strand brought about. The complementary to the dovetail shape Half-footed stops work with the Control cam provided in the area of the half-lightning head together at the same time and bring about the same sense, to Lifting movement of the half strands transverse movement of the Half strands.

The in the upper part of the half-strand, i.e. H. in the area of Support the half-cam head provided control cam this transverse movement of the half strands and thus cause the desired back and forth movement of the half-light head opposite the lifting healds.  

For securely holding the half strand within the lifting strands Security stops are provided that are in the free space  the half strand used by the two legs the half strand is formed.

If the lower end, i.e. H. So the half-strand foot does not swell formed tail-shaped, but for example straight linig, in the area of the half-strand foot additional taxes are ken provided that a shifting of the half-strand foot in the desired transverse direction to the lifting movement of the lifting strands cause.

An embodiment of the invention is described below of the drawings explained. The drawings show in

Fig. 1 three different positions of the lifting healds and the guided half heald, in

Fig. 2, the leadership of the stand-up thread and the leno thread through the half-strand or the lever strand and in

Fig. 3 shows a modified embodiment.

In the drawings, 1 and 2 denote two heddle support rails, which are carried by healings indicated in the drawing and to which lifting healds 10 and 20 close, the lifting healds 10 and 20 engaging over hooking the heddle support rails. For reasons of clarity, the heddle support rails are not shown in the lower area of the illustration in FIG. 1.

The lifting healds 10 , 20 are formed from a U-shaped cross section and take in the space thus formed a half heald 3 , which consists, for example, of a plasma-coated aluminum. The half-strand 3 has a half-strand eyelet 4 in the area of the half-strand head HK, through which the upright thread S, not shown in FIG. 1, is guided, as shown in FIG. 2.

The half-heddle 3 has two legs 5 and 6 , which extend towards the half-heald foot HF, but the half-heald foot is designed to be closed and, in the exemplary embodiment shown in FIG. 1, is dovetail-shaped, so that two stops 30 and 31 are formed. In the area of the half-strand foot HF, the lifting strands 10 , 20 are equipped with driver cams 7 , 8 , which are complementary to the swallow tail-shaped half-strand foot and engage in the space formed by the stops 30 , 31 .

Within the Rau mes formed by the two legs 5 , 6 safety stops 11 and 21 are provided on the lifting healds 10 , 20 , which cross the U-shaped space of the lifting healds 10 , 20 and thus secure the half heddles 3 within this space.

In the area of the half-strand head - as can be seen particularly clearly from the middle representation in Fig. 1 - in the space of the lifting healds 10 , 20 projecting control cams 15 , 16 in the lifting healds 10 , 20 are worked out, with the half-bit following head is somewhat rounded at the top, so that this rounded half-light head HK can interact with the correspondingly shaped control cams 15 , 16 .

In addition, in the lifting strands 10 , 20 sliding elements 13 and 23 are provided for the leno thread, these sliding elements preferably being made of ceramic and compensating for the wear otherwise occurring due to the thread tension.

The operation of the device according to the invention is like follows:

In the middle position shown in FIG. 1, the lifting strands 10 , 20 and the half strands 3 are in a theoretical zero position.

Is now the right lifting heald is raised in the left-hand illustration in Fig. 1 20, causes the drive cam 8, in conjunction with the stop 31 a slight movement of the half heald 3 to the right, wherein the Halblitzenkopf cam by the control 16 is pushed also to the right and the turner thread D, as can be seen from the illustration in FIG. 2, is forced from the half-flash head HK to the left into the space denoted by R. Here the leno thread D is considerably lower than the upright thread S.

Now moves the lifting strands 10 upwards and at the same time the lifting strands 20 downwards, the half-strands 3 are moved to the left by the driving cam 7 in connection with the stop 30 when the middle cam is passed over, the control cam 15 also forcing the half-flash head HK to the left and now the space R on the right side of the half strand 3 is released, so that the leno thread D can lay in this space.

By the up and down movement of the lifting strands 10 , 20 al not only causes an up and down movement of the half-strand eyelet 4 , but at the same time the actual half-strand 3 is forced into a reciprocating movement, so that each deflection of the leno thread D takes place and thereby the desired leno binding is achieved.

Instead of the dovetail-shaped design of the half-strand foot HF shown in FIG. 1, this can also be formed closed and the driver cams 7 a and 8 a can then be designed in a straight line. In this case, however, cam 32 and 33 are provided in the area of the half-strand foot on the lifting strands, and preferably the top of the half-strand foot HF is bevelled, so that this bevel can come into contact with the control cams 32 and 33 in such a way that the half-strand foot also thereby HF is moved either to the right or to the left in the drawing.

Due to the design according to the invention, an inevitable, ie positive entrainment of the half strands 3 is sufficient, in both directions. The semi-strands 3 can be formed GE closed, so it has a higher stability and also allows the type of control according to the invention that the actual semi-strands can consist of non-magnetic material, z. B. made of plasma-coated aluminum, so that a reduction in the accelerated masses can be achieved.

The provided sliding elements 13 and 23 , which are preferably made of ceramic, increase the lifespan of the lifting strands 10 , 20 , since there are no longer any signs of wear.

Claims (6)

1.Device for forming a leno edge by means of alternately moving heddle support rails supported by heald frames ( 1 , 2 ) and two lifting healds ( 10 , 20 ) carried by the heddle support rails ( 1 , 2 ) and one of the heels ( 10 , 20 ) guided, ie from one or the other lever heald ( 10 , 20 ) entrained half heald ( 3 ), which has two legs ( 5 , 6 ), at the upper ends of the half heald head (HK) forming a half heald eye ( 4 ) for guiding a straight thread (S) is provided, control cams ( 15 , 16 ) projecting in the area of the half-strand head (HK) on the lifting healds ( 10 , 20 ) into the region of the half-strand ( 3 ), which control the half-strand ( 3 ) when and movement of the lifting healds ( 10 , 20 ) lead to the opposite side, characterized in that in the lower region of the lifting healds ( 10 , 20 ) on the lifting healds ( 10 , 20 ) in the region of the half strand (HF) of the half strand ( 3 ) projecting Wed tneh mernocken ( 7 , 8 ; 7 a, 8 a) are provided which cooperate positively with stops ( 30 , 31 ) provided on the half-strand ( 3 ) 2. Device according to claim 1, characterized in that the half-strand foot (HF) forming the lower end of the half-strand ( 3 ) is designed to be closed. 3. Device according to claim 1 or 2, characterized records that the half heald foot (HF) as swallows tail is formed. 4. Device according to one of the preceding claims, characterized in that wear-resistant sliding elements ( 13 , 23 ) for the leno thread (D) are provided on the lifting healds ( 10 , 20 ). 5. Device according to one of the preceding claims, characterized by securing stops ( 11 , 21 ) which engage in the space formed by the legs ( 5 , 6 ) of the half strands ( 3 ). 6. Device according to one of the preceding claims, characterized in that control cams ( 32 , 33 ) are provided in the region of the half-strand foot (HF).