RU2636308C2 - Weaving machine having device for leno edge formation - Google Patents

Abstract

FIELD: textile, paper.SUBSTANCE: weaving machine is proposed, having shedding elements to form a shed from warp threads, and having a device to form a leno edge of a ground thread and two leno threads, whereby the device includes a first guide device for guiding the first needle for a leno thread and the first needle drive for driving the first needle for a leno thread, as well as a second guide device for guiding the second needle for a leno thread, and a second needle drive for driving the second needle for a leno thread, wherein the guide devices and needle drives are mounted on a holder driven by a drive in the longitudinal direction of the needles for a leno thread; it additionally comprises a thread-guiding element having two guide loops extending parallel to the longitudinal direction of the needles for a leno thread, arranged on the thread-guide elements facing opposite to each other. According to the invention, the guide devices are made each in the form of a linear guide, so that the needles for a leno thread can be set in motion in the weft direction of the weaving machine, and wherein the first and the second needle for a leno thread are configured to be actuated through the appropriate coordinated first and second needle drives independently from the other needle for a leno thread in the weft direction of the weaving machine. The drive needles are made in the form of pneumatic, electric motor, or electromagnetic linear drives. Both guides and both drive needles are mounted on a holder, so that the first needle for a leno thread can be set in motion in the first plane and the second needle for Leno threads can be set in motion in the second plane, these two planes passing parallel to each other. The thread-guiding element is located in the area between the shedding elements and two planes of the needles for a leno thread, so a track is formed between the warp threads and the ground threads.EFFECT: improved performance.8 cl, 4 dwg

Description

The invention relates to a weaving machine having a device for forming a leno edge.

A weaving machine having a device for forming a leno edge is known, for example, from DE 1814269. The leno edge is formed by leno yarns and warp yarns. Using the leno edge, the edge of the fabric is fixed to such an extent that the warp yarns in the edge region of the fabric can no longer separate from the fabric in the direction of the weft.

In DE1814269, leno threads reciprocate relative to the stays using electromagnetic drive devices via transmission elements and fork-shaped pairs of needles for leno threads. In this case, leno threads move in the direction of the weft. Using these needle drive devices for leno threads, different types of leno weaves are achievable.

Often in a loom, several leno edges are needed. They can be located on this fabric on the right and left, or in fabrics in several paintings, also in the middle between the fabrics. In accordance with DE1814269, each such leno edge requires its own drive device for reciprocating these needles for the leno thread in the direction of the weft. Such mechanisms are expensive and heavy and therefore have not proven themselves in practice.

A device is known from WO 2011095262 A1 in which several needles guiding the shaped threads can be driven by one common drive in the direction of the weft. However, WO 2011095262 A1 does not disclose the formation of leno edges at the edge of the fabric or between multiple webs of fabric.

An object of the present invention is to provide a weaving machine with a simple arrangement for forming one or more leno edges.

The problem is solved with the help of a weaving machine having a device for forming a leno edge according to the independent claim.

A weaving machine according to the invention has a device for forming a leno edge, which has a first guide device for guiding the first needle for the leno thread and also a first needle drive for driving the first needle for the leno thread. In addition, this device has a second guiding device for guiding the second needle for the leno thread, as well as a second needle drive for driving the second needle for the leno thread. In this case, the needles for the leno thread, as a rule, are elongated, thin elements having an eye for the thread through which the proper leno thread is guided. Guiding devices and needle drives are mounted on a holder driven by a longitudinal directional needle drive. The longitudinal direction of the needles for leno thread runs in a weaving machine, usually perpendicular to the warp and weft threads; with most weaving machines this is essentially a vertical direction. In addition, the device has a thread guide element. The thread guide element is an elongated element, the longitudinal axis of which, as a rule, is directed in the same direction as the longitudinal axis of the needles for leno thread. The thread guide element has two longitudinally extending guide rails. These two guide circuits are located on two facing each other sides of the thread guide element. These are, as a rule, two sides or boundary surfaces of the thread guide element, which are directed in the weaving machine to the warp threads.

The weaving machine also has shedding elements with which a pharynx can be formed. The shedding elements on the weaving machine are, for example, heels or hanger cords. With the aid of a shed forming machine installed on the weaving machine, healds or wire cords can be moved with the help of proper galev between the position of the upper and lower pharynx. With the help of warp threads, which are sent in galevs, with the movement of the pharynx a pharynx is formed.

The weaving machine having the leno edge forming apparatus according to the present invention is characterized in that the first and second guiding device are made in the form of linear guides so that the leno threads can be guided, respectively, driven in the direction of the weft of the weaving machine . In addition, both guiding devices and both needle drives are fixed to the holder so that the first leno needle can be driven in the first plane and the second leno needle can be driven in the second plane, and these two planes run parallel to each other to a friend. In this case, the distance between these two planes can be ensured, for example, by means of distance elements in the area of the guiding devices which are mounted on the holder properly.

The yarn guide element according to the invention is located in the region between the shedding elements of the weaving machine and two planes in which the needles for the leno thread can be driven.

With the arrangement of the invention, it is possible to alternately bring the first and second needle for leno thread with the corresponding first and second leno thread, moving towards each other in the direction of the weft, on the right and left side passing in the direction of the warp thread. Due to the drive of the holder in the longitudinal direction of the leno thread needles, i.e., usually vertically, both leno thread needles, respectively, both leno threads are alternately above or below the plane into which the weft threads are inserted. In this case, with the help of the thread guide element, a path is formed for the passage of this needle for the leno thread between the stand thread and the adjacent warp thread.

In the described process of movement, the stand thread and the weft thread respectively inserted can simultaneously be entwined with both leno threads. This makes it possible to obtain a particularly strong weave of the leno edge.

In addition, advantages are obtained due to the fact that the thread guide element is located in the area between the leno needles and the galevs of the shed forming element of the weaving machine. In this way, a path is formed between the warp yarns and the warp yarn without the risk of collision between the weaving of the weaving machine and the yarn guide element. In order to achieve the passage of the leno thread needles between the filament thread and the warp thread in the region in which the existing track is the widest, it is preferable if the passage point is close to the thread guide element. To do this, it may be advisable to bend the leno thread needles in the direction of the thread guide element — that is, in the back direction of the warp — or positioned obliquely, starting from the guide device.

The first and second leno thread needles can each be driven by an appropriate first and second needle drive, independently of a different leno thread needle, respectively, in the direction of the weft of the weaving machine.

Preferably, the first and second needle drives are each in the form of linear drives. Needle drives can be pneumatic, electric motor or electromagnetic linear drives.

Preferred is, for example, an arrangement in which the first and second guiding devices, as well as the first and second needle drives are mounted on the front side of the heald frame. Thus, standard elements are used as holders for the leno device, namely, commercially available heald frames with the guides of the heald frames belonging to them. A technically advantageous solution is the drive of the holder, respectively, of the heald frame from the shed forming machine of the weaving machine. Due to the characteristic processes of movement of the shed forming machines, this, as a rule, leads to the fact that the leno threads during successive introductions of the weft are alternately above and below the weft thread. In the case where a leno edge is desired, in which the leno threads should always be above or always under the weft threads during successive introductions of weft, the holder can also be set in motion by a drive which, between the two introductions of the weft, carries out the full movement of the holder up and down. This may be, for example, a drive that is diverted from the drive of a reel of a weaving machine.

With appropriate programming of the needle needle drives for the leno thread and the drive for the leno device holder, different variants of leno weaves at the edge of the fabric can be obtained.

Optionally, several embodiments of the weaving machine of the invention are obtained due to different mounting possibilities of the thread guide element.

The first simple design is obtained when the thread guide element is mounted on the same drive holder as the needle guides for the leno thread.

In this case, the yarn guide element is driven synchronously with the leno thread needles in its longitudinal direction, respectively, in the longitudinal direction of the leno thread needles. So that during this movement the yarn guide element in the region of warp and warp yarns always retains its track formation function, the yarn guide element with its guiding contours should be made long enough so that the yarn guide element cannot cross with the warp thread or adjacent warp yarns. For example, it may be appropriate if the guiding contours of the thread guide element extend to a length that approximately corresponds to the distance between the position of the upper shed and the position of the lower shed on the weaving machine.

In other preferred embodiments, the implementation of the yarn guide element is mounted on the shed forming element of the weaving machine or on a fixed structural element of the weaving machine.

When mounted on a shed forming element, movement along with the warp and weft threads in the longitudinal direction of the thread guide element occurs with it.

When mounted on a fixed structural element of a weaving machine, for example, a transverse cross-beam of the bed, the thread guide element should also have a length that approximately corresponds to the distance between the position of the upper pharynx and the position of the lower pharynx. In this case, when changing the pharynx, the threads do not cling to the free end of the thread guide element or do not cross incorrectly with the thread guide element.

Typically, the fabric is limited to a leno edge on both sides. Therefore, it is advisable to fasten the first group of two first needles for a leno thread and the second group of two second needles for a leno edge to the first, respectively, second guiding device. In this case, both leno thread needles in the direction of the weft are spaced from each other at a distance that approximately corresponds to the width of the fabric in the reed. In the area of the right, respectively, left edge of the fabric, a leno is formed by each pair of needles for a leno thread, while one needle for a leno thread of this pair belongs to the group of the first needles for a leno thread, while the other needle for a leno thread of this pair belongs to a group of second needles for leno thread. For each of these pairs of first and second needles, an at least one thread guide element is provided for the leno thread, which provides a track on one side of the stand thread between the stand thread and, respectively, the adjacent warp thread.

Of course, you can also make each stun thread go through its own thread guide element on both sides. In this case, for each pair of first and second needles for a leno thread, a pair of two thread guide elements is provided. This leads to higher process reliability, as lateral deflection of the stand thread is prevented.

For the formation of leno edges at the point of separation of the fabric into two canvases in the middle, it is advisable to add needles for leno threads for two edges of the fabric in the middle to the groups of first and second needles for leno threads for the outer two edges.

This results in a group of the first and a group of second needles for a leno thread, which consist of each of four needles. All four needles of the same group are connected to the same guiding device, which is driven by a single needle drive. For each of the total number of four edges of the fabric, one pair of first and second needles for a leno thread is used, for the formation in each case of a leno edge of two leno threads and one stand thread.

In the middle, in the case of a fabric in two webs, at least three thread guide elements are used. In each case, one yarn guide element for two tracks between two warp yarns and each adjacent warp thread and another yarn guide element to form a track between the two middle warp yarns.

Accordingly, another embodiment of a weaving machine according to the invention provides that there are groups of first and second needles for a leno thread, as well as several thread guide elements, and these thread guide elements and needles for a leno thread are arranged so that for two pairs of first and second needles for the leno thread provides one group of three thread guide elements.

For fabrics of several fabrics having several separation sites between the individual fabric webs, the number of first and second needles for a leno thread in each of the two groups of needles respectively increases so that on each outer and middle edge of the fabric there is a pair of first and second needles for a leno threads. As already explained for fabrics in two canvases, for fabrics having more than two cloths, always for two pairs of first and second needles for a leno thread, a group of three thread guide elements is also provided.

In another embodiment of the invention, particularly preferred for multi-web fabrics, leno threads are pulled from bobbins of the yarn storage bin, which is located above the weft insertion zone of the weaving machine. This allows easier accessibility of the yarn bobbins for leno threads from the front of the weaving machine. At the same time, advantages are obtained for the operating personnel, since when the thread breaks, the irregular threads should not stretch forward from the area behind the shedding elements.

The formation of leno edges on the weaving machine of the invention having the leno device described above has advantages especially when producing fabrics in several fabrics with a high rotational speed. Used in the prior art, the galev leno remizki are, as you know, elements that, due to strong wear, can no longer be used cost-effectively at high speeds of rotation of machines. In addition, for leno devices with motor drives, for the formation of leno edges for each edge of the fabric requires its own drive; it increases costs. For higher speeds of the machine, leno devices equipped with motor drives are used, in which leno threads are guided through the eyes of the leno disk. However, such leno discs create an undesirably wide path between the middle leno edges of the fabric in several paintings.

The present invention makes it possible to produce fabrics in several paintings having leno edges using only two needle drives. In addition, at the points of separation between the fabric webs in the middle, very narrow paths can be realized. In this case, the width of the track is determined only by the thickness of the needles for the leno thread and thread guide elements. In this way, fabrics of several webs having a leno edge can be made especially economically and with a high speed of rotation.

Figure 1 shows a schematic, without respecting scale, image of one of the embodiments of the invention proposed by the invention of a weaving machine in local top view;

figure 2 - schematic, without respecting scale, the image of the cross section of a variant of implementation in accordance with figure 1 with the direction of view in the direction of the duck;

figure 3 - schematic, without respecting scale, the image of another variant of implementation of the invention of the weaving machine, front view, in accordance with the section line A-A (see figure 2);

figure 4 - schematic, without respecting scale, the image proposed by the invention of the weaving machine in accordance with figure 3 in local top view.

Figure 1 shows a local view of the invention of the weaving machine having warp yarns 2 that extend on the weaving machine in the warp direction 3, and also having weft yarns 4 that extend in the weft direction 5.

In the present exemplary embodiment, the shed forming elements 8 are frame healds having a galev through which the warp threads 2 are guided or respectively moved.

The leno edge 1 is formed with the help of two leno threads 6.1, 6.2 and one stand thread 7. The stand thread 7 runs at the edge of the fabric parallel to the warp threads 2. She may or may not participate in yawning. The first leno thread 6.1 is guided through the first needle 11.1 for leno thread in the first plane 15.1. The second leno thread 6.2 is guided through the second needle 11.2 for leno thread in the second plane 15.2. Both planes 15.1, 15.2 of the needles 11.1, 11.2 for the leno thread extend parallel to each other in the direction 5 of the weft and in the longitudinal direction of the needles 11 for the leno thread. Each of the two leno needles 11.1, 11.2 can alternately be located to the right and left of the stand thread 7. There is a yarn guide element 16, which on two sides facing each other has guide circuits 17.1, 17.2 running parallel to each other in the longitudinal direction of the needles 11 for leno thread. The guide circuits 17 form contact surfaces or contact lines on the thread guide element 16, which in the weaving machine are directed to the warp threads 2 or, respectively, to the stand thread 7. On the guide circuits 17, the stand thread 7 and the adjacent warp thread 2 are guided so that between them the distance is maintained by the two, even when the warp thread 2 and / or the stand thread 7 move for yawing in the longitudinal direction of the leno needles 11. In this case, the cross-sectional size of the thread guide element is selected so that a track is formed between the stand thread 7 and the warp thread 2, into which the needles 11 for the leno thread can sink without clinging to one of two adjacent threads. The leno threads 6 and the proper stand thread 7 together stretch through the gap between the teeth of the reed 10 on the weaving machine.

Figure 2 shows the weaving machine in accordance with figure 1 in local view with the direction of view in the direction 5 of the weft. The warp threads 2 are pulled together from a non-depicted navoi behind a weaving machine. Also, the stand thread 7 is pulled from the not shown stock of threads behind the weaving machine. In the depicted embodiment, the leno threads 6 are pulled together from the bobbins of the yarn storage unit 18, which is located above the weft insertion zone of the weaving machine.

The first leno needle 11.1 is mounted on the first guide device 12.1, and the second leno needle 11.2 is mounted on the second guide device 12.2. Both leno needles 11.1, 11.2 in the present example are bent in the direction 3 of the warp back to the yarn guide 16. The guiding devices 12 in this example consist of guides that are screwed to the heald frame. Several distance elements glide along the guide rails in direction 5 of the weft, which determines the distance between the two planes 15.1, 15.2 of the needles 11.1, 11.2 for the leno thread. The drive elements are fixed to the remote elements, each of which is connected with its outer end to the needle drive 13, made in the form of a linear motor drive. On each of the drive bars there are needle holders for individual needles 11 for a leno thread or for groups of needles 11 for a leno thread. The guide rails extend in the direction 5 of the weft on the front side of the holder 14, which is driven by the shedding machine 9, which also drives the shedding elements 8 on the weaving machine.

Figure 3 shows the location of the actuators 13.1, 13.2 of the needles on the heald frame of the weaving machine. Both needle drives 13.1, 13.2, together with appropriate guiding devices 12.1, 12.2, are fixed on the front side of the heald frame or, respectively, holder 14 and are driven by the shedding machine 9 in the longitudinal direction of the leno needles 11. Each of the two needle drives 13.1, 13.2 can be driven by an electronic control device not shown, independently of the other needle drive 13, respectively.

To form a leno edge 1, each of the two leno needles 11.1, 11.2 is alternately brought to the right or, respectively, to the left side of the stand thread 7. Then, the holder 14 is driven in the longitudinal direction of the leno needles 11, that is, perpendicular to the warp threads 2 , stand thread 7 and thread 4 weft. A weft can be inserted in each of the two end positions of the holder 14, so that with a new change in the position of the needles 11 for the leno thread, the leno threads 6 are alternately above and below the threads 4 of the weft and alternately to the right and left of the proper stand thread 7. This results in a leno hem 1 in three strands.

Figure 3 shows the arrangement of the guiding devices 12 and the needle drives 13 on the holder 14, which is the same for all the embodiments described here. However, FIG. 3 also shows details of another embodiment of a weaving machine of the invention. This is an embodiment in which several groups of first and second needles 11.1, 11.2 for leno thread are always provided for one group of thread guide elements 16. Other details of this embodiment for fabric in several fabrics are shown in figure 4. For two pairs of first and second needles 11.1, 11.2 for a leno thread, respectively, one group of three thread guide elements 16 is provided.

At the same time, two outer thread guide elements 16 form a track between the corresponding stagnation thread 7 and the adjacent thread 2 of the fabric web base. The middle yarn guide element 16 forms a path between two warp yarns of adjacent fabric webs.

LIST OF REFERENCE NUMBERS

1 Leno edge

2 warp thread

3 Direction of the base

4 thread weft

5 direction duck

6.1, 6.2 First leno thread, second leno thread

7 Standing thread

8 Shedding elements

9 Shedding machine

10 Birdo

11, 11.1, 11.2 Needles for leno thread, first needle for leno thread, second needle for leno thread

12, 12.1, 12.2 Guide device, first guide device, second guide device

13, 13.1, 13.2 Needle drive, first needle drive, second needle drive

14 Holder

15.1, 15.2 Needle planes for leno thread

16 Threading element

17, 17.1, 17.2 Guide circuits

18 Thread storage bin for leno threads

Claims (13)

1. A weaving machine having shedding elements (8) for forming a pharynx from warp threads (2), and also having a device for forming a leno edge (1) from the stand thread (7) and two leno threads (6.1, 6.2), and this the device includes a first guide device (12.1) for guiding the first needle (11.1) for the leno thread and a first needle drive (13.1) for driving the first needle (11.1) for the leno thread, and a second guide device (12.2) for guiding second needle (11.2) for leno thread and second d (13.2) needles for driving the second needle (11.2) for leno thread, while the guiding device (12) and the actuators (13) of the needles are mounted on the holder (14), driven by a drive in the longitudinal direction of the needles (11 ) for a leno thread, in addition, includes a yarn guide element (16), which has two needles (11) extending parallel to the longitudinal direction for the leno thread of the guide guides (17.1, 17.2) located on the opposite sides of the yarn guide element (16 ), characterized in that the guiding devices (12) are each made in the form of linear guides so that the needles (11) for the leno thread can be driven in the direction (5) of the weft of the weaving machine, moreover, the first and second needles (11.1, 11.2) for the transfer of thread made with the possibility of bringing into action by means of a corresponding coordinated first and second drive (13.1, 13.2) of the needles regardless of the respectively other needle (11) for the transverse thread in the direction of (5) weft weaving machine, and moreover, the actuators (13) of the needles are made in the form of pneumatic, electric motor or electromagnetic linear drives, moreover, both guide devices (12.1, 12.2) and both needle drives (13.1, 13.2) are fixed on the holder (14) so that the first needle (11.1) for the leno thread can be driven in the first plane (15.1) and the second needle ( 11.2) for leno thread can be set in motion in the second plane (15.2), moreover, these two planes (15.1, 15.2) pass parallel to each other, and moreover, the thread guide element (16) is located in the region between the shedding elements (8) and two planes (15.1, 15.2) of the needles (11) for the leno thread, so that by the thread guide element (16) a path is formed between the warp threads (2) and the stand threads (7). 2. The weaving machine according to claim 1, wherein the thread guide element (16) is fixed to the holder (14). 3. The weaving machine according to claim 1, wherein the thread guide element (16) is fixed to one of the shed forming elements (8) of the weaving machine. 4. The weaving machine according to claim 1, wherein the thread guide element (16) is fixed to the fixed structural element of the weaving machine. 5. A weaving machine according to one of claims 1 to 4, in which a group of first needles (11.1) for a leno yarn is fixed on the first guide device (12.1) and a group of second needles (11.2) for a leno yarn is fixed on the second guide device (12.2) moreover, these groups of first and second needles (11.1, 11.2) for the leno thread can be driven by the first and second drives (13.1, 13.2) of the needles, respectively. 6. The weaving machine according to claim 5, which has several thread guide elements (16), and these thread guide elements (16) and needles (11) for the leno thread are arranged in such a way that, respectively, for a pair of first and second needles (11.1, 11.2 ) for a leno thread, a group of two thread-guiding elements is provided (16). 7. The weaving machine according to claim 5, which has several thread guide elements (16), and these thread guide elements (16) and needles (11) for the leno edge are arranged so that for two pairs of first and second needles for the leno thread a group of three thread guide elements is provided (16). 8. The weaving machine according to claim 5, which has yarn storage (18) for leno yarns (6), and these yarn storage (18) for leno yarns (6) are located above the introduction area of the weaving loom.

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