EP0916758A2 - Half heald of a leno heddle device - Google Patents

Abstract

Half heald of a leno edge device with lifting healds, the half heald having two legs which can be connected at their upper end to form a head and which each have a foot at their lower end, the foot magnetically cooperating with at least one magnet of the lifting heald, and the The foot (70, 80) of the half strands (50) has a shape such that the magnetic force acting on the foot (70, 80) of the half strands (50) in the lifting direction (arrow 100) of the lifting strands (2, 3) is smaller than in the opposite direction, the foot (70, 80) having an upper end in the form of an end edge (71, 81), so that the half strands (59) can be braked alternately magnetically by the lifting strands (2, 3).

Description

Half heald of a leno edge device with lifting healds, the half heald has two legs, which at their upper end to form one Head are connectable, and one foot each at its lower end have, the foot with the at least one magnet Lifting wire works together magnetically.

From DE-GM 89 03 775 a half strand made of metal is known, in which the Full surface foot for better control by the magnet of the lifting wire is trained.

A leno selvedge device of the type mentioned is known from DE-PS 38 18 680 well known. The device for forming a The leno edge consists of two lifting healds, the two alternately moving heald frames of a loom are arranged. The A device for forming a leno edge also comprises a Half strands, which from the lifting strands according to the movement of the Heald frames are taken alternately. The half strand has two thighs that form at their top end forming a head converge with an eyelet to guide the upright thread. Such Half strand is made of metallic material. Each lifting wire has their lower end has at least one magnet that is controlled Carrying the half strand through the respective lifting strands in such a way that it is ensured by the magnetic force that the half strands of the lifting strands during the respective entraining movement by the lifting strands is held. As already stated, this principle is from DE-PS 38 18 680 well known. The half strand is carried by the Lifting wire and here in particular by one arranged in the lifting wire Bridge on which the half strand with its end head during the Carried by the respective lifting heald.

It has now been shown that the lifting strands are relatively in the area of this web cuts quickly. This is mainly due to the high number of strokes up to 1200 shots and more justifies what causes the half strands with very high speed and correspondingly high energy on the dock hits. To avoid such incisions is also already a stopper has been proposed in the lifting heald under the magnet use it as a stop for the foot of the leg of the half strand serves. With this, the wear in the area of the web could be considerable can be reduced, and the lifespan of the lifting heald considerably extended be, however, was the lifespan, especially considering the increasing number of strokes in the weaving machines, even with this stopper too low.

The invention is therefore based on the object, a half strand of the input to create the type mentioned, which increases the lifespan of the lifting healds also possible with very fast weaving machines.

The object is achieved in that the foot of the Half heddle has a shape such that that on the foot of the half heddle Magnetic force acting in the stroke direction of the lifting strands is smaller than in the opposite direction, with the foot in the form of an upper end has a trailing edge, so that the semi-strands through the lifting strands is mutually magnetically braked.

Due to the special shape of the foot of the half strand with the upper End edge is achieved that the magnetic resistance against a Submerge the half strands against the lifting direction of the lifting strands so far is increased that it is ultimately greater than the resistance to the Lifting the foot of the half strands out of the magnetic field is required. The means that the magnetic force when immersing one foot of the half strand in the area of the magnet of the lifting wire increases continuously with the Consequence that it is prevented that the foot breaks through, that is, the half strands on the upper end strikes the web of the lifting heald with her head, whereas when lifting the other foot of the half strand from the Area of the magnet of the lifting wire, the resistance due to that by the Shape of the foot was made of continuous increase in magnetic Mass is lower. In other words, this means that the half-strand when moving with a lifting strand through the Magnet in which a lifting wire is held in the starting position. The result of this is that during this movement the half strands no longer enter the a lifting brace dips and onto the web of one lifting brace - like this is the case with the prior art - comes to rest. That is, it finds consequently there is no more wear on the web of the lifting heald, so that in principle this bridge can also be dispensed with. The means that such a leno edge device comprising two Lever strands and a half strand work essentially without wear.

Specifically, it is provided that the foot of the half strands tapers downward, ie counter to the lifting direction. The type of taper can be done either in cross-section or in a top view of the foot of the leg of the lifting heald. It is essential that the magnetic force increases from bottom to top by increasing the magnetic material. From the bottom up means here, seen from the lower end of the foot upwards towards the leg of the half strand. The shape of the foot advantageously shows the shape of a triangle, the downward tip of which points to the center of the magnet of the lifting heald. Upwards, that is, as the upper end, the foot has the end edge. By tapering the foot downwards it is achieved that when the foot is lifted out of the magnetic field of the magnet of the other lifting heald a force is required which is less than the force that the foot wants to plunge further into the lifting heald against the lifting direction . The reason for this lies in the fact that in connection with the end edge of the foot, which advantageously extends essentially over the entire width or diameter of the magnet, the resistance to overcome this end edge is greater than, conversely, the resistance to lifting out (in Stroke direction) of the foot from the magnetic field is required
since the tapering of the foot reduces the resistance continuously, whereas the resistance to overcome the trailing edge decreases abruptly, but is nevertheless considerably higher due to the abrupt transition.

According to a special feature of the invention it is provided that the Legs cranked in the lower area to accommodate the foot is. This ensures that the foot upwards, d. H. in the stroke direction can form a free trailing edge with that already described above Consequence that the corresponding magnetic through this terminating edge Resistance to submerging the half strands against the stroke direction the leverage is increased so that it is ultimately larger than the Resistance used to lift the half strands out of the magnetic field is required.

It is particularly provided that the leg is cranked outwards is trained. This means that the bow created by the cranking after shows outside. Such training is advantageous to the extent that in Area of the lifting heald is more space available.

Figur 1

zeigt die vollständige Vorrichtung zum Bilden einer Dreherkante mit zwei Hebelitzen und einer Halblitze;

Figur 2

zeigt eine Hebelitze in einer Seitenansicht;

Figur 3

zeigt die Hebelitze gemäß Figur 2 in einer Ansicht gemäß dem Pfeil III aus Figur 2;

Figur 4

zeigt die Halblitze in vergrößerter Darstellung.

Figur 5 bis Figur 8

zeigen verschiedene Ausführungsformen des Fußes des Schenkels einer Halblitze.

The invention is explained in more detail below by way of example with reference to the drawings.

Figure 1

shows the complete device for forming a leno edge with two lifting healds and a half heald;

Figure 2

shows a lifting wire in a side view;

Figure 3

shows the lifting heald according to FIG. 2 in a view according to arrow III from FIG. 2;

Figure 4

shows the half strands in an enlarged view.

Figure 5 to Figure 8

show different embodiments of the foot of the leg of a half strand.

The device 1 for forming a leno edge comprises two lifting healds 2, 3, which can be connected to reciprocating heald frames, and the take the half strands 50 mutually accordingly. The The principle of operation is known, for example, from DE-PS 38 18 680 which is hereby expressly referred to. Each lifting heald 2, 3 consists of essentially of two legs 10, 20, each of these legs 10, 20 a hook-shaped element 11 or 21 for attachment to the heddle support rails (not shown) of the corresponding alternately moved Has heald frames of the loom.

The half-heddle 50 shown in FIG. 4 shows two legs 51, 52 at its upper end to form a head 53 converge. The head 53 shows an eyelet 54 for receiving the through the half-strand 50 guided thread. The legs 51, 52 are on hers lower end each cranked to form a foot 70, 80 educated. The offset (arrow 55, 56) is chosen such that these each form an arc outwards so that these feet 70, 80 point inwards. The feet 70, 80 are designed such that taper them downwards (arrow 90), but taper them upwards Form end edge 71, 81. Other embodiments of the foot can be found in FIGS. 5 to 8.

The leg 20 of the lifting heald 2, 3 shows a slot 22 for slidably receiving the leg 51, 52 of the half-heddle 50 (Figure 3). At the upper end of the leg 20 there is a guide opening 30 provided the entrance to the slot 22 of the leg 20 for the Legs 51, 52 of the half heddle 50 represents. It follows that the thigh 20 in principle, forming the slot 22 from two walls 25, 26 exists, which on a long side of the slot to form the web 23rd are held together.

To control the movement of the half strands 50 through the lifting strands 2, 3 now shows the lifting strands in the lower region of each leg 20 Magnet pair 40. Such a magnet pair 40 consists of two magnets 41, 42, which are opposite each other in the walls 25, 26 of Leg 20 of the lifting heald 2, 3 are arranged. It is now essential that the length X of the leg 51, 52 of the half strand 50 is greater than that Distance Y from the magnet pair 40 to the upper end 24 of the web 23 (Figure 2). Because this ensures that the semi-heddle 50 with their Head 53 and here in particular with the roof-shaped connecting web 59 no longer comes to rest on the end 24.

In the foot shown in Fig. 5, a downward is conical or pointed circumferential approach 75, 85 provided, whereby a continuous Material increase is guaranteed.

6, a tip 76, 86 is shown, which also enables a continuous increase in material.

The same applies to the foot according to FIGS. 7a and 7b, although here the foot in cross section downward forms a tip 77, hence the Cross section decreases towards the bottom.

There is always one for all of these display types of different feet End edge 71, 81 provided.

The representation according to FIGS. 8a, 8b differs from that other embodiments than here the leg of the half strand from not magnetic material is formed, the tip 78, however, from magnetic material. The end edge 71, 81 is thus by the Transition from non-magnetic to magnetic material. But also here, as already explained, is the foot for the formation of the tip 78 conical.

The device now works as follows:

During the stroke movement (stroke direction arrow 100) of one lifting heald 2 a leg 51 of the half strand 50 due to the magnetic effect of the Magnets 41, 42 of the other lifting heald 3 counter the need Stroke the stroke direction 100 further into a lifting strand 2. Now is how already executed the magnetic resistance, that is, the Magnetic force exerted on the foot 70 of the leg 51 of the half strand 50 the magnets 41, 42 of the lifting heald 2 is exerted greater than the force for lifting the foot 80 of the leg 52 out of the other lifting heald 3. The stroke direction is indicated by arrow 100. This is because because through the end edge 71 of the foot 70 of the leg 51 of the Half strand 50 already has a considerably larger magnetic resistance is called the magnetic resistance that comes up when digging out bottom tapering foot 80 of the leg 52 of the half-strand from the Area of the magnets 41, 42 of the other lifting heald occurs. The reason for this, as has already been explained elsewhere, is in there find that the foot 80 is closing down, i.e. in the direction of the arrow 90, rejuvenated. The function described above is exactly the opposite if the lifting heald 2 is not raised, as in FIG. 1 shown, but alternately the lifting heald 3.

Claims (8)

Half heald of a leno edge device with lifting healds, the half heald having two legs which can be connected at their upper end to form a head and which each have a foot at their lower end, the foot interacting magnetically with at least one magnet of the lifting heald,
characterized,
that the foot (70, 80) of the half strands (50) has a shape such that the magnetic force acting on the foot (70, 80) of the half strands (50) is smaller in the lifting direction (arrow 100) of the lifting strands (2, 3) than in the opposite direction, the foot (70, 80) having an upper end in the form of an end edge (71, 81), so that the half-strands (59) can be braked alternately magnetically by the lifting strands (2, 3). Half strand according to claim 1,
characterized,
that the foot (70, 80) tapers downwards. Half strand according to claim 2,
characterized,
that the foot (70, 80) tapers downward in cross section. Half strand according to claim 2,
characterized,
that the foot (70, 80) tapers downwards in the view. Half strand according to claim 1,
characterized,
that the leg (51, 52) is cranked in the lower region for receiving the foot (70, 80). Half strand according to claim 1,
characterized,
that the leg (51, 52) is cranked outwards. Half strand according to claim 1,
characterized,
that the end edge (71, 81) extends essentially over the width of the magnet (41, 42) of the lifting heald (2, 3). Half strand according to claim 2,
characterized,
that the foot (70, 80) is approximately in the form of a triangle, the downward tip of the triangle being directed towards the center of the magnet (41, 42).

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