EP3899121A1

EP3899121A1 - Giver rapier head, loom with a giver rapier head of this kind and method for double weft insertion

Info

Publication number: EP3899121A1
Application number: EP19816672.0A
Authority: EP
Inventors: Lars Öller; Frank Seifried
Original assignee: Lindauer Dornier GmbH
Current assignee: Lindauer Dornier GmbH
Priority date: 2018-12-21
Filing date: 2019-12-06
Publication date: 2021-10-27
Anticipated expiration: 2039-12-06
Also published as: CN113195811A; CN113195811B; DE102018222722B3; JP7407823B2; JP2022514093A; EP3899121B1; WO2020126546A1

Abstract

The invention relates to a giver rapier head (4) for a rapier loom with double weft insertion, said loom having a first guide device (2) and a second guide device (3) for respective weft threads (7, 8), wherein the two guide devices (2, 3) are arranged at a distance from one another on the front end, in the insertion direction of the weft threads (7, 8), of the giver rapier head (4). The first weft thread (7) is guided in the first open guide device (2), and the second guide device (3) for the second weft thread (8) has a clamping plate (6) to keep it closed. The weft threads (7, 8) are clamped in a yarn clamp (1) during weft insertion. The yarn clamp (1) can be brought, by means of an actuating device (9), from a clamping position into an open, non-clamping position, and the clamping plate can be brought, by means of the actuating device (9), into an open position, not closing the second guide device (3). The actuating device (9) operates the yarn clamp (1) in a double function, either decoupled from the movement of the clamping plate (6) to transfer the weft thread (7, 8) from the yarn clamp (1) or together with the clamping plate (6) to release the second weft thread (8) from the second guide device (3), wherein the times of the release of the particular weft thread can be adjusted. The invention further relates to a rapier loom for double weft insertion with a giver rapier head as described above and to a method for weft insertion by means of a rapier loom with the features described above.

Description

BRINGER GRIPPER HEAD, WEAVING MACHINE WITH SUCH A BRINGER GRIPPER HEAD AND METHOD FOR DOUBLE SHOT ENTRY

The invention relates to a bringer rapier head, a weaving machine with such a rapier rapier head and a method for double weft insertion.

With double weft insertion, two weft threads are inserted into a shed at the same time using a bringer gripper. Approximately in the middle of the shed, the two weft threads are transferred to a Holer gripper, which conveys the weft threads to the discharge side from the shed after they have been taken over. The bringer gripper moves out of the shed back to the entry page to pick up one or two weft threads again.

The known bringer rapier heads have two guide devices, by means of which two weft threads are introduced into a shed at a distance from one another. By means of the Holer rapier head, the weft threads introduced into the shed at a distance from the bringer rapier head can be removed from the shed again in a disputed form, in the known systems, however, after the transfer to the Holer rapier head and release of the weft threads from the guide devices the spacer of the weft threads of the bringer gripper head, or this separate guidance of the one weft thread leaves a free choice of color, which is also known as a pic-pic system

designated, not too.

A so-called Texo-Bringer gripper head is known, for which for one

A gripper clamp is present and a second guide device is provided for the second weft thread, which is spaced apart from the gripper clamp serving as the first guide device. By means of this known bringer rapier head, the two weft threads are introduced into the shed at a distance from one another up to approximately the center thereof and are taken over there by the Holer rapier head. After the transfer has taken place, both the gripper clamp and the guide device for the second weft thread are opened, so that their spacing is removed again over the width of the shed when the two weft threads are discharged by means of the Holer rapier head. H. the

Separation between the two weft threads is lost, making a low-twist double weft insertion impossible. The advantage of this known system is that due to the fact that the second guide device is opened and

can be closed, a free choice of colors is possible. However, it is not possible to insert the weft threads without twisting. Are the weft threads over the length of the shed not separated and cannot be introduced into the shed with little twisting, this leads to poor quality in the finished fabric.

The spacing of the two weft threads from each other throughout the whole

To maintain a double weft entry so long that both the bringer rapier head and the holer rapier head have left the shed and the weft threads can be struck evenly at the binding point, a bringer rapier head has been developed, which is referred to as the panama bringer rapier head, which has a gripper clamp and, as a second guide device, has a closed eyelet which cannot be opened. The second weft, which is the second through this eyelet

Thread guide device is guided, secures the distance between the two weft threads even when the rapier hook head moves back out of the shed. This means that the second weft thread can also be inserted into the shed with little twisting, but the implementation of a pic-pic system is not possible because the second weft thread does not change the weft thread from weft insertion to weft insertion in the second thread guiding device designed as a closed eyelet enables. To do this, the machine would have to be stopped and another weft thread drawn in, which is technically not a sensible implementation. Bringer rapier head systems, which are not just a spacing of two weft threads into one shed and one

Maintaining the distance between the two weft threads and thus allowing the weft threads to be introduced into the shed with little twisting until both the holer rapier head and the bringer rapier head have left the shed again, and for which a free choice of colors by means of a pic-pic System is guaranteed are not known in the prior art.

WO 2010/142264 A1 describes a system for a double weft insertion, in which two weft threads are inserted into a shed by means of a bringer rapier head, the two weft threads being guided and clamped by separate elements in the bringer rapier head. The two weft threads are positioned in such a way that they remain separated from one another during the weft insertion. After transfer to the Holer rapier head, both weft threads are released so that the rapier rapier head can move back out of the shed. As a result, the two weft threads lose their spacing from one another and can therefore no longer be hit evenly at the binding point. WO 2014/206818 A1 describes a method and a device for a double-shot entry. The first weft thread of the two weft threads inserted into the shed at the same time is moved transversely to the insertion direction and away from the second weft thread by means of an adjustment device, so that twisting of both weft threads should not occur during insertion. The first weft thread and the second weft thread are kept at a distance at the head of the hook and the distance is increased during the insertion by means of an adaptation device. The spacing of the weft threads should be maintained until the shed closes and the gripper is arranged outside the shed. At this

Arrangement, however, the weft threads have a varying distance from the binding point at the time the shed is closed. This unequal distance is intended to ensure that the part of the weft thread which is already closer to the binding point is already tied off and its slipping in the direction of the second weft thread is to be prevented.

A free choice of color of the weft thread is not described in this known arrangement.

WO 2009/135636 A1 describes a bringer rapier, a holer rapier and a device for a rapier weaving machine which realizes a double weft insertion. Two weft threads are kept at a distance from one another by the weft thread separator, which has two stops and is arranged on one side of the bringer gripper, by means of the two stops. In the middle of the shed, the bringer gripper transfers the weft threads held at a distance to the holer gripper, which clamps these weft threads while maintaining the distance and by moving backwards out of the shed on the

Discharge side moved out. The distance between the two weft threads is realized by the difference in height of the weft thread separator, which is formed by two sliding surfaces over which the respective weft thread slides.

EP 1 135 548 B1 describes a bringer gripper for defenseless weaving machines, in particular for the simultaneous insertion of several weft threads into a shed. The bringer gripper receives at least two weft threads from bars, has a box-like hollow shape and has an upper cover with a notch in which the weft threads are inserted. A plurality of grooves are formed in this notch, each groove being for a weft. A gripper organ is there to take the weft threads and transfer them to a Holer gripper in the shed. The weft threads are each arranged along relatively angled feed paths with respect to the axial movement of the bringer gripper so that they remain arranged in the throats. In particular due to the inclination, the two weft threads are, for example, in the case of a double weft insertion arranged relatively close to each other, so that touching and sliding over the weft threads cannot be completely avoided when striking the binding point.

Compared to this known prior art, the object of the invention is to provide a bringer gripper head which has two for a double-shot entry

Transfers weft threads into the shed for transfer to the Holer rapier head at a distance from one another and maintains the spacing of the two weft threads from one another even when moving back out of the shed, the bringer rapier head being intended to enable a pic à pic weft thread selection.

This object is achieved by a bringer rapier head with the features according to claim 1, by a rapier weaving machine for a double weft insertion with such a bringer rapier head with the features according to claim 7 and by a method for weft insertion by means of such a rapier weaving machine with the features according to claim 10 . Appropriate further developments are defined in the respective dependent claims.

The Bringer rapier head according to the invention for a rapier weaving machine

Double weft insertion has a first guide device which guides a first weft thread and a second guide device which guides a second weft thread. Both guide devices are arranged at a distance from one another in the direction of insertion of the weft threads at the front end of the bringer rapier head. The distance extends essentially transversely to the entry direction, so that the weft threads in the shed with respect to the binding point at which they are finally struck by means of the sley,

are arranged one behind the other or next to each other. It is important here that the distance is of such a size that the weft threads do not overlap before or when striking the binding point, or the rear weft thread does not reach the front weft thread in sections, for example, and therefore does not twist. The first weft thread is guided in the first guide device, which is designed to be open in the entry direction. The second guide device, which guides the second weft thread, has a clamping plate, by means of which this second guide device can be kept closed. During the weft insertion, the weft threads are clamped in a gripper clamp, which is also provided on the bringer gripper head, namely at its front end in the insertion direction. The gripper clamp is made of one by means of an actuating device

Clamping position in an open, non-clamping position and from the open, non-clamping position can be brought back into a clamping position. The clamping plate is by means of Actuating device can also be brought into an open position that does not close the second guide device or from the open, non-closing position into a closed position.

According to the invention, the hook clamp in the sense of a double function is either decoupled from the movement of the clamping plate for transferring the weft threads from the hook clamp by means of the actuating device or, according to a second function, together with the clamping plate to release the second weft thread also from the second

Direction operated. The times at which the respective weft thread is released can be set. This means that the looper clamp can be opened or closed without opening the second guide device for the second weft thread. Since the first weft thread is guided in the first, open guiding device, when the weft threads are transferred to a Holer rapier head after opening the rapier clamp, both weft threads can be gripped by the Holer rapier and clamped there, while maintaining them of the distance between the two weft threads without the second weft thread being released from the second guide device, which is still closed at the time. If after the weft threads have been transferred to the Holer rapier head, the latter moves back in the discharge direction and at the same time the rapier rapier head moves back, the second weft thread remains in the second

Guided facility. This guidance is maintained until the bringer gripper head has passed the entry side after its backward movement out of the shed and has left the shed again. This ensures that a parallel spacing of both weft threads is maintained across the entire width of the sley.

The fact that the second weft thread is only released by opening the second guide device at this point in time after leaving the shed means that the distance between the weft threads is, so to speak, frozen up to this point in time. Because the second guide device can be moved independently of the gripper clamp and can be opened at selected times, it is possible to implement a pic-pic system, ie the weft threads can be changed from one entry to another entry without the Machine must be stopped. If the bringer rapier head is located outside the shed, a new, and also different, weft thread can be introduced into the second guide device at this point in time in the open position of the second guide device, so that after it has been closed, the latter second guide device, both weft threads can then be reinserted into the open shed for a new weft insertion.

The bringer rapier head according to the invention thus has the advantage that over the entire weaving width, ie. H. the entire width of the shed transversely to the extent of the warp threads which form the shed, two weft threads simultaneously inserted over the entire width of the shed are kept at a distance from one another which is defined or formed by the distance of the second guide device on the rapier gripper head. Since the second guide means in its movement to open and close it

Movement of the gripper clamp is decoupled, d. H. is decoupled from the movement of the clamping plate of the gripper clamp, both weft threads can thus be transferred to the Holer rapier head without the second weft thread being released from the second guide device. The second weft thread is thus brought back out of the shed as the bringer head moves backwards.

According to a preferred embodiment, the actuating device of the bringer gripper head is designed as a divided clamping lever, the first part of which actuates the gripper clamp in order to open or close it, and the second part of which actuates the gripper clamp and the clamping plate for simultaneously opening and closing the second guide device. The second guide device and the clamping plate on the one hand and the gripper clamp on the other hand can thus be actuated independently of one another, i. H. their operation is decoupled from one another.

Preferably, the actuating device and, in connection therewith, the split clamping lever on the bringer rapier head are designed such that the time at which the weft threads are released from the rapier clamp is the time at which the transfer position to the Holer rapier head is reached and that the time of Release of the second

Weft from the second guide means, d. H. the time of opening the second guide device, by actuating the clamping plate of the rapier clamp, is the reaching or leaving of the shed by the rapier rapier head. By separating the actuation of the clamping plate of the gripper clamp on the one hand and the second

The guide device, on the other hand, by means of the divided clamping lever, it is possible to determine or control the times of the respective opening or closing.

In its clamping position, the gripper clamp is preferably designed with a clamping force such that the weft threads are clamped in their clamping area in such a way that during of their entry in the shed, that is to say during the forward movement of the bringing rapier head into the shed, the weft threads in the clamping area do not slip through it, but are drawn into the shed without slippage, so to speak. Because the weft threads do not slip in the clamping area, they are not damaged either, except perhaps in the immediate clamping area. However, the immediate clamping area of the weft thread is usually outside the fabric edge and is therefore cut off. If it is an insert edge, this damage to the weft thread, which can be clearly visible from the outside, is limited to the fabric edge, which will not be processed later in the assembly anyway.

In contrast, in its position closing the second guide device with respect to the actual second guide device, the clamping plate is designed such that the second weft thread moves out of the shed when the bringer rapier head moves, ie. H. in its backward movement after transfer of the weft threads to the Holer gripper, when the second weft thread is guided by the second guide device in it

slides through. This slight and gentle sliding of the second weft should not damage it despite its additional movement with the backward movement of the bring rapier out of the shed, but at the same time it should ensure that the distance of this second weft to the first weft is maintained, so that the weft in their arrangement in the shed are arranged or remain parallel to one another across the entire width of the shed before striking the binding point. It is only when the sley moves in the direction of the binding point that the two weft threads arranged parallel to one another at a distance in the shed are successively attached to the

Brought tie point, which ensures that the weft threads are not

Experience slipping and twisting, but actually be hit one by one carefully and as gently as possible at the binding point.

According to a second aspect of the invention, a rapier weaving machine for a

Double shot entry described with such a Bringer gripper head. A bringer gripper head and a holer gripper head are provided, which at

Weft transfer in the rapier weaving machine, d. H. interact in the shed of the rapier weaving machine. The bringer rapier head has a rapier clamp, which is provided for clamping at least two weft threads, which in the clamped position in the

Webfach be entered. In addition there is a clamping plate for guiding a second one

Weft thread is provided so that the guide in a closable with the clamping plate second guide device is formed. The second management facility and the

The gripper clamps are spaced apart from one another so that the weft threads have this spacing from one another after the entry into the shed. The two weft threads held at a distance by means of the bringer rapier head are transferred to the Holer rapier head, which has two spaced-apart depressions into which the two weft threads are inserted, while maintaining this distance. After the weft threads have been transferred from the bringer rapier head to the holer rapier head, the bringer rapier head moves backwards out of the shed in the direction of its entry side, the holer rapier head likewise moving backwards from the

Transfer point of the weft threads in the direction of the discharge side moved out of the shed. The second weft thread is still guided in the second guide device of the bringer rapier head, which is closed with the clamping plate, with fixed spacing with respect to the first weft thread. Even when the Holer rapier head moves in the direction of the discharge side out of the shed, both weft threads remain in an arrangement that differs slightly from parallelism, that is, over the entire weaving width. The second weft thread is only released by opening the second guide device by actuating the clamping plate by means of the actuating device. The decisive advantage of the rapier weaving machine according to the invention now consists in the fact that the parallelism, ie. H. the spacing of the individual weft threads from one another is maintained, but on the other hand a different weft thread can be selected for each individual weft thread entry, this should be important from a weaving point of view.

The bringer gripper head preferably has a clamping lever, specifically a split clamping lever, which has a first part and a second part. By means of the first part, the gripper clamp is actuated via the actuating device in the area for transfer to the Holer gripper head, so that one of the weft threads can be brought from a clamping position into a position releasing the weft threads, the actuation of the first part of the clamping lever by the actuation of the second part of the clamping lever is decoupled. So the gripper clamp can be operated without the clamping plate of the second

Guide device is operated. As a result, the clamping lever of the gripper clamp can be actuated at a first point in time and the clamping plate of the second guide device at a second point in time, which is different from the first point in time. But it is also possible that the coupling is released and the clamping lever and the clamping plate both can be moved synchronously with one another, so that the gripper head according to the invention can also be used as a gripper head which is conventional in the prior art.

The actuating device on the bringer rapier head for the rapier weaving machine according to the invention is preferably designed such that the clamping plate can be brought from the first position, in which the second guide device is closed, to a second position, in which the second guide device is open, by means of the second part of the clamping lever is. When the actuating device is actuated, the second part of the clamping lever actuates the first part of the clamping lever in the sense of a double function together with the first part of the clamping lever.

According to a further aspect of the invention, in a method according to the invention for weft insertion by means of a rapier weaving machine described above, if there are a number of weft threads for a weaving cycle, a first and a second

Weft thread selected and at the same time presented to a bringer rapier head as described above. The first and the second weft threads are then gripped by the bringer rapier head, entered into a shed and transferred to a Holer rapier head approximately in the middle while maintaining a distance between the two weft threads. The two weft threads are held at a distance from one another in the bringer rapier head. According to the method according to the invention, the two weft threads are clamped in a gripper clamp, which is actuated independently of a clamping plate of the bringer gripper head. The two weft threads are transferred from the bringer rapier head to the Holer rapier head approximately in the middle of the shed by opening the rapier clamp beforehand, the second guide device being kept closed, so that the second weft thread is also transferred to the Holer rapier head is, but is still guided in the second management facility. The second guide device is kept closed by means of the clamping plate until the bringer gripper head has left the shed by moving it back from the center of the shed via the entry side out of the shed, so that when the holer emerges on the discharge side of the shed, The gripper head keeps both weft threads spaced apart from one another with a parallelism that may differ slightly from one another. With the release of the second weft thread, as it were delayed, because the second weft thread in the second guide device, which is kept closed, is also led back out of the shed from the center of the shed, the second weft thread remains at a substantially constant distance from the first weft thread, so that can be prevented io

that the weft threads are arranged one above the other and twist and after the stop at the binding point there is a clearly visible fabric defect. Such tissue defects are just avoided with the method according to the invention. The invention will now be described using an exemplary embodiment with reference to the accompanying

Drawings explained in detail. The drawing shows:

Figure 1 is a three-dimensional view of a bringer gripper head according to the invention in a viewing direction to the side of the bringer gripper head on which the guide devices are arranged; and

Figure 2 shows the embodiment of Figure 1, but in a direction of view on the side of the bringer gripper head with the gripper clamp.

In Figure 1, a bringer gripper head 4 is shown in a three-dimensional view. Whose

The direction of insertion into the shed is indicated by the arrow drawn in FIG. 1 at the top left. In the front part of the bringer rapier head 4 in the entry direction, a rapier clamp 1 is drawn, in which a first weft thread 7 and a second weft thread 8 are clamped. Before the bringer rapier head 4 is inserted into a shed (not shown), the two weft threads 7, 8 to be inserted are presented to it and in the

Gripper clamp 1 clamped. So that the weft threads 7 and 8 can be introduced into the area of the hook clamp 1, an actuating device 9 is provided, by means of which the hook clamp 1 can be opened. Simultaneously or after opening the

Gripper clamp 1 can be opened by means of the actuating device 9, a second guide device 3, in which the second weft thread 8 is guided, whereby the weft thread 8 can be guided out of the second guide device 3 and can be replaced by a new, different weft thread. As long as one clamping plate 6 the second

Keeps the guide device 3 closed, the second weft 8 in the second

Guide device 3 guided, but can not be removed from this. Therefore, the bringer rapier head 4 according to the invention offers the possibility of either holding the second guide device 3 closed by moving the clamping plate 6, as a result of which the second weft thread 8 is guided, or opening it. This offers the opportunity to

Remove weft 8 from the otherwise closed guide device and replace it with a new weft. The clamping plate 6 is also by the

Actuating device 9 is pivoted from the position closing the second guide device 3 into a position keeping the second guide device 3 open. This is the Actuating device 9 designed as a divided clamping lever 10, the divided

Clamping lever 10 has a first part 10a for opening only the gripper clamp 1 and a second part 10b for opening the gripper clamp 1 and the clamping plate 6. For this purpose, the clamping plate 6 has a nose-like projection, which closes the second guide device 3 when the position is lowered, but keeps it open when the clamping plate 6 is in the raised position. On its front side, the clamping plate 6 has a mouth-like guide which has a first guide device 2 for the first weft thread 7. The distance between the base of the mouth-like opening in the form of the first guide device 2 and the second guide device 3 represents the distance 5 between the first weft thread 7 and the second weft thread 8.

If only the first part 10a of the split clamping lever 10 is actuated, then only the gripper clamp 1 opens. The first part 10a of the split clamping lever 10 and the second part 10b of the split clamping lever can be decoupled from one another or moved together. When the first part 10a of the divided clamping lever 10 is actuated by pressing it down, the gripper clamp 1 opens for picking up or releasing weft threads. In the pressed state of the first part 10a of the divided clamping lever 10, the second part 10b of the divided

Clamping lever 10 can then also be actuated or pressed, which results in lifting the clamping plate 6 and thus releasing the second weft thread 8 from the second

Guide device 3 leads. The release of the second guide device 3 is to be understood to mean that the second guide device 3, which was previously closed by means of the clamping plate 6, is brought into an open position. If the second

Guide device 3 is open, the weft 8 can be guided out of this and replaced by a new one. Otherwise, as is the case with the prior art, a pic-pic system would be. H. a free choice of weft was not given without stopping the machine and a new weft in a then closed eyelet as a second

Introduce management facility.

However, the first part 10a and the second part 10b of the divided clamping lever 10 can also be operated together by depressing the second part 10b of the divided clamping lever 10 of the actuating device 9. The second part 10b of the divided clamping lever 10 engages over the rear end of the first part 10a, so that when the second part 10b of the divided clamping lever 10 is depressed, both parts 10a, 10b are actuated simultaneously. The gripper clamp 1 and the second guide device 3 thus open, since the clamping plate 6 is also lifted synchronously. By dividing the split clamping lever into a first one Part 10a and a second part 10b can therefore the gripper clamp 1 and the second

Guide device 3 can be operated independently of one another or synchronously with one another. The first weft thread 7 and the second weft thread 8 are spaced apart by a first guide device 2, which is arranged in the entry direction at the front end of the clamping plate 6, that is to say in front of the second guide device 3. The distance between the first

Weft 7 and the second weft 8 is identified by 5. By means of the Holer rapier head, this distance is maintained when the two weft threads 7, 8 have been transferred from the bringer rapier head 4 to the Holer rapier head, so that after the weft threads, ie. H. after the Bringer rapier head 4 has been moved back out of the shed and the Holer rapier head has also been moved out to the discharge side of the shed again. In this way, the two weft threads 7, 8 can be inserted into the shed at a defined distance from one another during the double weft insertion, as a result of which the weft threads are pushed over and twisted during

subsequent stops of the weft threads at the binding point is prevented.

In Figure 2, the Bringer gripper head 4 shown in Figure 1, which is designed in the present embodiment as a so-called left gripper head, is shown in three-dimensional view from the side on which the gripper clamp 1 is located. In the position shown, the gripper clamp 1 is closed and clamps both weft threads 7, 8. The clamping force of the gripper clamp 1 is designed such that when both weft threads are inserted into the shed, they cannot slide or slide through the clamping region of the gripper clamp 1. On the rear side of the drawing, the clamping plate 6 with the first guide device 2 for guiding the first weft thread 7 is shown.

It can be seen in FIG. 2 that the actuating device 9 is designed as a divided clamping lever 10 which has a first part 10a and a second part 10b. It can be seen in FIG. 2 that the front edge of the second part 10b overlaps the first part 10a at its rear area, so that when the second part 10b is actuated the entire part

Actuator with both parts 10a and 10b is pressed simultaneously. However, if only the first part 10a of the split clamping lever 10 is pressed, only that opens

Gripper clamp 1 and releases the weft threads 7 and 8 without the second

Guide device 3 is already open. When the gripper clamp 1 is open, the second part 10b of the divided clamping lever 10 can then be pressed or actuated separately, as a result of which the second guide device 3 by pivoting the clamping plate 6 is released. When the two weft threads 7, 8 have been entered in the shed and have been transferred to the Holer rapier head, the bringer rapier head 4 moves back again. During this time, the second guide device 3 is still closed, that is

Clamping plate 6 with the second part 10b of the divided clamping lever 10 has not yet been actuated. Only when the bringer rapier head 4 has left the shed is the second weft 8 released by actuating the second part 10b of the divided clamping lever 10, so that the two wefts 7, 8 are arranged in the shed at a defined distance and essentially parallel to one another . They are therefore struck at the binding point essentially independently of one another, so that they slip

for example, the second weft 8 cannot occur over the first weft 7. The direction of entry is again shown by the arrow shown in FIG. 2 at the front end of the bringer gripper head 4.

Reference symbol list:

1 gripper clamp

2 first guide device

3 second guide device

4 Bringer gripper head (left gripper head)

5 distance between the two weft threads between the first and second guide means

6 clamping plate

7 first weft

8 second weft

9 actuating device

10 split clamping levers

10a first part (for opening the gripper clamp)

10b second part (for opening the gripper clamp and the clamping plate)

Claims

EXPECTATIONS

1. Bringer rapier head (4) for a rapier weaving machine with double weft insertion with a first guide device (2) for a first weft thread (7) and a second guide device (3) for a second weft thread (8), both of which are at the front in the insertion direction of the weft threads The end of the bringer rapier head (4) are arranged at a distance (5) from one another, the first weft thread (7) being guided in the first, open guide device (2) and the second

Guide device (3) for the second weft thread (8) has a clamping plate (6) to keep it closed, the weft threads (7, 8) are clamped in a hook clamp (1) during the weft insertion and the hook clamp (1) is actuated by means of an actuating device ( 9) can be brought from a clamping position into an open, non-clamping position and the clamping plate (6) by means of the actuating device (9) into an open position which does not close the second guide device (3),

characterized in that

by means of the actuating device (9) the gripper clamp (1) in the sense of a

Double function either decoupled from the movement of the clamping plate (6) to transfer the weft threads (7,8) from the hook clamp (1) or together with the clamping plate (6) to release the second weft thread (8) also from the second guide device (3) can be actuated, the times of release of the respective weft thread being adjustable.

2. Bringer gripper head (4) according to claim 1, characterized in that the

Actuating device (9) is a divided clamping lever (10), the first part (10a) of which operates the gripper clamp (1) for opening and closing and the second part (10b) of which is the gripper clamp (1) and the clamping plate (6) for opening and Closing the second guide device (3) actuated.

3. Bringer rapier head (4) according to claim 1 or 2, characterized in that the time of release of the weft threads (7,8) from the rapier clamp (1) is the reaching of a transfer position to a Holer rapier head.

4. Bringer gripper head (4) according to one of claims 1 to 3, characterized in that the time of release of the second weft thread (8) from the second Guide device (3) by actuating the clamping plate (6) is the reaching or leaving the shed by the bring rapier head.

5. Bringer gripper head (4) according to claim 4, characterized in that the

Gripper clamp (1) in its clamping position the weft threads (7,8) in one

Clamping area clamps in such a way that the weft threads (7,8) are clamped with such a clamping force during their entry into the shed that the weft threads (7,8) do not slip through the clamping area.

6. Bringer gripper head (4) according to claim 5, characterized in that the

Clamping plate (6) in its position closing the second guide device (3), the second weft thread (8) when the bringer rapier head (4) moves out of the shed, guiding the second weft thread (8), through the second guide device (3) leaves.

7. rapier weaving machine for double weft insertion with a bringer rapier head (4) with the features according to any one of claims 1 to 6 and thus

Weft thread transfer interacting Holer rapier head, in which the bringer rapier head (4) by means of its gripper clamp (1) for clamping two weft threads (7,8) for their entry into a shed and by means of it

Clamping plate (6) for guiding the second weft thread (8) in a second guide device (3), which can be closed with the clamping plate (6), enters both weft threads (7, 8) at a distance (5) from each other into the shed and in the middle of the holer Gripper head takes over both weft threads (7,8) spaced apart from one another in the bringer rapier head (4) by means of two spaced-apart recesses spaced apart from the bringer rapier head (4), with the bringer The rapier head (4) can again be moved out of the shed to its entry side, during which the second weft thread (8) is still guided in a second guide device (3) closed with the clamping plate (6) so that it is fixed to the first weft thread (7) so that it is spaced apart when the Holer rapier head moves to the discharge side of the shed, both weft threads (7, 8) have an arrangement that is at best slightly different from parallelism over the entire shed have width and the second weft thread (8) can only be released by opening the second guide device (3) by actuating the clamping plate (6). 8. rapier weaving machine according to claim 7, characterized in that the bringer rapier head (4) has a clamping lever (10) with a first part (10a) and a second part (10b), by means of the first part (10a) via a

Actuating device (9) the looper clamp (1) in the area for transfer to the Holer looper head from which the weft threads (7,

8) clamping position can be brought into a position releasing the weft threads and wherein the actuation of the first part (10a) of the clamping lever (10) is decoupled from the actuation of the second part (10b) of the clamping lever (10).

9. rapier weaving machine according to claim 7 or 8, characterized in that the clamping plate (6) by means of the second part (10b) of the clamping lever (10) of the rapier-gripper head (4) from a position closing the second guide device (3) into an open position Position can be brought, the second part (10b) of the

Clamping lever (10) also actuates the first part (10a) of the clamping lever (10) in the sense of a double function.

10. A method for weft insertion by means of a rapier weaving machine with the features according to one of claims 7 to 9, in which, in the case of a number of weft threads for a weaving cycle, a first (7) and a second weft thread (8) are selected and at the same time a bringer rapier head (4th ) presented with the features according to any one of claims 1 to 6, gripped by the rapier gripper head (4), entered in a shed and in the middle of it to a Holer rapier head while maintaining a distance (5) between the two weft threads (7, 8 ) are passed to one another, the two weft threads (7, 8) being held at a distance from one another on the bringer rapier head (4),

characterized in that

the two weft threads (7,8) clamped in a gripper clamp (1) of the bringer rapier head (4) that is actuated independently of a clamping plate (6) are transferred to the holer rapier head in the middle of the shed after opening the gripper clamp (1) and that in a second, still kept closed

Guide device (3) by means of the clamping plate (6) guided second weft thread (8) is transferred to the Holer rapier head, the second guide device (3) being kept closed by means of the clamping plate (6) until the rapier gripper head (4th ) left the shed by moving backwards, so that when the Holer rapier head emerges on the discharge side of the shed, both weft threads (7, 8) remain spaced apart from one another with a slightly different parallelism.