NO127930B - - Google Patents

Description

Method and device for producing a zipper by weaving.

The invention relates to a method of manufacture

of a zip when weaving, whereby a continuous plastic profile strand for forming the zip joint row in the weaving site. area is bent around a loop forming mandrel and tied to the tape fabric. The invention also relates to a device for producing a zipper by means of a weaving method with a row of zipper joints formed by a continuous profile string, where a loop-forming mandrel is arranged in the area of the weaving site.

When producing a band of moriophile threads, it is known to use extra warp threads a<y> voluminous material at the band edges, which are drawn into the edge area by an extra weft that did not cooperate with the other warp threads, so that the edge 'a curved opening'' (German, utility model no; •• 1,975 • 695) • A comparable binding has also been used for the production of edge loops in curtain ties (German patent r.r. 149. 2- 29), where there between an up. and down movable loop cord and the band edge was arranged an up and down. movable holding thread which was alternately crossed-above and below,'.-by the yeft thread, which was wound' around- the loop cord on the other side of the holding thread and pulls it forward to the band edge, whereby the cord due to the movement of the holding thread at the pull is caught by the weft and forms a suspension loop for the curtain tape. Apart from the movement, the loop cord is passive in the formation of these edge loops, as the entire transverse movement of the loop cord is exclusively provided by the weft thread which, due to its thread tension, must pull on the thick loop cord during a weft turn. For this, a large weft thread tension is required, which, however, at the places equipped with edge loops, produces unevenness in the tape weave due to a loss of thread tension, which is not only aesthetically disadvantageous, but also results in an impure binding of the edge loops. In addition, the loop cord must be soft so that plastic profile cords cannot be used either.

In principle, there are also known looms without a shuttle where the weft threads are placed in loop form by thread guides that are stored at the edge of the weave, and whose loops are looped to the opposite edge of the weave either by means of thread grippers (German patent no. 803-989) or fixed by a additional thread drawn through the loops (British patent no. 566,944).

In the case of looms without a shuttle, to fix the ends of the introduced wefts while forming the most perfect edge possible, it is recommended to use a needle exclusively up and down movable warp thread to arrange an exclusively transversely movable base thread, which leads to the fact that in successive wefts the warp thread is alternately on one side and then on the other side of the base thread in the upper shell, so that this warp thread is added to the base thread as a kind of loop formation over the weft thread ends and secures them to the base thread. (French patent no. 1,411,838). " *' . '

Furthermore, it is known to use jointed fabrics provided before weaving which are only tied off at the weaving site by the wet threads on the carrier belt (German translation document no. 1.152; 073 ):• The jointed fabrics can thereby be formed from prefabricated screw thread-shaped windings on a profile strand. The disadvantage here is that the zipper joints have to be produced in extra, time-consuming work steps. However, special difficulties arise due to the fact that these prefabricated zip link rows must be incorporated in coordination with the weaving process, i.e. that the weft threads must be introduced at the correct distance corresponding to the zip link distance, one after the other in the openings between the zip links. For this reason, a protective tube is laid around the prefabricated row of joints which first ends at the weft point and ensures that it is only at this point that the weft threads, respectively the warp threads, can fall into the gaps between the zipper joints (German design document no. 1,023,422), whereby often in addition effective holding fingers must close the gap between the zip links after the introduction of the weft thread (U.S. patent no. 2,651,330). Instead of screw thread-shaped windings on one profile string that forms the hinge, the zipper joints have also been formed by curvatures on a warp thread, which assumed a practically flat position and did not enable any placement of the weave, which was secured against twisting (German design document no. 1,022,981) .

They have also introduced a joint-forming profile string as a weft thread in the weave, whereby in one case, a preliminary product was first produced with a profile string that runs meander-shaped between two edge courses and which formed sprinklers between the edge courses, after which this preliminary product had to be bent U-shaped along its center line to to form the joint, which was very cumbersome (German utility model no. I.809.515). It is also known to give the profile strand introduced as a special weft thread already during weaving the desired winding, e.g. as a three-dimensional meander (German design document ..no. 1,110,102) or give it a helical course (German design document no. -1,171,659). This profile string is joined with the warp threads arranged in the edge area of the weave. For the formation of the front weirs that form the connecting surfaces of the joint, an additional loop-forming mandrel is also used which acts as a warp thread with the profile string that was carried as a weft thread and which is then pulled out of the finished windings (French patent no. 1.280.111 , German interpretation documents no. 1,111,116 and 1,275,318). In this weaving process with two shuttles, only low working speeds are permitted. Many stays must also be included, in order to replace the loosely woven weft coil with the thick profile strand, which often occurs due to the thickness of the profile strand.

'•■Finally, it is also known to let a profile string run -up

and down; ne Horr- two- weave type in the form of a binding thread, however, the zipper joint is not completely produced by weaving, but the flat windings to the profile string must be bent over - longitudinal centerline•■' to U-shape.,, after which this:.sti 11 ing' is fixed-.-- A further disadvantage lies in the time-consuming -production of a multi-layer fabric in the area of the profile string in the form of a Y-band* (Swiss patent no'; '457-. 946)'.

The task which is the basis of the invention is to provide a method and a device for weaving a zipper, of it. initially mentioned 'type, where the joints by' weaving -can. are produced accurately and; as simply as possible and in a quick way of the plastic profile string. - '• '

This task is solved by means of a method which - is characterized by - the link-forming profile strand being guided as a shell-shaped warp thread back and forth through the plane of the fabric at the same time as it is rhythmically guided around - a loop-forming mandrel and 'pulled off from the latter in its longitudinal direction and tied off using at least one weft thread..-

The plastic profile strand which now works as a warp thread allows a very high working speed when producing the entire zipper - by weaving.... The profile strand is stored in a thread feed magazine with a large volume, so that stopping the weaving due to the thread feed magazine running out is no longer necessary. ' Moreover, no additional measures are required in order to achieve an accurate design of the zip link rows and a good binding of the individual zip link by means of the weft thread at the places desired at any given time on the carrier tape fabric. By passing the profile string around the loop-forming mandrel, the cross-section of the profile string for forming the individual zipper joint will be precisely fixed, whereby this shaping takes place •■• immediately at the weaving site, just before it is fixed by tying off with the help of at least one weft thread. Thus, the weft thread's tie-off point at the guide point of the profile string around the loop-forming mandrel is precisely predetermined and no special measures are required for the weft thread to be placed between nearby zip links in the vertical distance available at the weaving site. • The desired pitch for the turns of the slide-lock row can also be provided in the simplest way by the weft distance and the weft front. After weaving, the zipper row is fixed in its winding form without the need for further processing. The weaving itself is also very simple, as a simple single-layer weaving plane is sufficient for the zip link chain to be provided and tied off perfectly.

The shell-forming movement of the profile string is up and down through the plane of the weave, determined by the weft insertion line and the comb stop line. The joint-forming warp thread can be guided to its shell-forming movement through this weaving plane by means of known thread guides, whereby these thread guides can lead the joint-forming warp thread in a raised shell or a lowered shell or a raised-lowered shell for introducing the weft thread. Appropriately, the joint-forming warp thread is given greater shell-forming movement than the warp threads that belong to the weave.

Por to improve its management. joint-forming warp thread around the loop-forming mandrel, it is appropriate that the joint-forming warp thread, in addition to its shell-forming movement, is rhythmically guided to the side in relation to the weaving plane. This can be done by a lateral movement component of associated thread guidance for the shell-forming movement of the joint-forming warp thread, but guide surfaces in the path of the rhythmic movement can also give the joint forming warp thread movement the desired transverse component for guidance around the loop forming mandrel.

During the weaving stroke movement of the zipper tape warp threads, it is advantageous that the loop forming mandrel does not. bound, fastening end is constantly kept on the same side of the plane of the weave, so that the mandrel is either always under or over-gripped by the weft thread. but not alternately lying above and below the weft. The simplest option consists in the loop forming mandrel's fastening end being placed at rest. In order to facilitate the movement of the joint-forming warp thread around the loop-forming mandrel, the attachment end of the mandrel can be given a movement that goes against the above-mentioned movement of the joint-forming warp thread, but also here without crossing the weave plane. The unbound end of the loop-forming mandrel is thus located in one of the two areas of the fabric shell, namely either above or below the plane of the fabric, therefore the joint-forming warp thread will at all times only be guided around the loop-forming mandrel.. For the sake of a simplified working method the joint-forming warp thread thereby performs its rhythmic movement at all times on the side of the loop-forming mandrel that faces the carrier part and only reaches the opposite side for short periods during its movement around the loop-forming mandrel.

The guiding of the link-forming warp thread around the mandrel can - corresponding to the distance between successive zipper links - occur every time this warp thread enters the shell where the "untied fastening end of the loop-forming mandrel is located. This can happen at every other weft insertion, which leads to easy sliding lock qualities. For heavier qualities, however, it is appropriate that several weft insertions are carried out between successive interlocking loops around the joint-forming warp thread, whereby at the same feed speed of the fabric, a greater distance is obtained between overlapping zipper joints. For firmer binding or covering of joints, it is appropriate in a known manner to tie extra warp threads in the area of the rear winding parts of the joint-forming warp thread.

In order to improve the engagement of the weft threads, it is further appropriate that the link-forming warp thread, before it reaches the weaving site, is provided with cross-sectional deformations in a manner known per se. These can also serve to determine bending points for the later winding formation at the weaving site. Finally, these cross-sectional deformations could serve for complementary shaping of zipper surfaces on the individual zipper joints, just as the engagement depth of the zipper joints in the zipper joint row for the complementary zipper half can be determined by cross-sectional deformations that act as stops. In order to facilitate the guiding of the joint-forming warp thread, it is further appropriate that the joint-forming warp thread is fed to the weaving site in a predetermined feed step length. Appropriately, the device for feeding is combined with the above-mentioned deformation device, so that the degree of feed is precisely matched to the successive the following cross-sectional deformations by means of this coupling, as well as these measures are carried out in conformity with the weaving rate.

The invention also relates to a device for producing the initially mentioned zipper.' This device is distinguished by the fact that the loop-forming mandrel is engaged in a mandrel holder which has a passage for the link-forming warp thread, whereby the link-forming warp thread is entrained in a thread guide that participates in the weaving stroke. In order to provide a loop, the joint-forming warp thread is passed through the passage in the mandrel holder, so that after a full envelopment of the mandrel stored there it returns to its starting position. Thereby, the joint-forming warp thread has gone in a circle around the mandrel in the mandrel holder. The fastening end of the loop forming mandrel is arranged between the guide means for the warp threads and the untying point, where the weft is introduced and closed.

The guiding of the joint-forming warp thread through the passage takes place in the simplest case alone by means of the guiding means which cause its weaving stroke movement. The door holder and its passage can be designed in different ways, whereby each of the possibilities has its -special advantages.

One possibility is that the mandrel holder is formed by a bearing bushing and an insert that accommodates the loop forming mandrel with radial clearance, where the passage is formed by/the radial clearance alone. In a practical embodiment, the insert can consist of a ball, where the mandrel end is inserted and which is surrounded by bushings with radial clearance so that the joint-forming warp thread can push through the joint between the ball and the bushing. Instead of arranging a radial clearance between the insert and the bearing, one can also allow the insert to be taken up by fingers directed radially towards each other, whereby the passage in this case can be created by the fingers being lifted in turn from their contact with the insert and thereby periodically an efficient passage for carrying out the joint-forming warp thread.

It is particularly advantageous, however, that a rotary body is arranged in the bearing which occupies the fastening end of the loop forming dore and which is provided with an eccentric recess for the link-forming warp thread. This thread runs through a slot in the bearing into this eccentric recess in the rotary body, by means of which the joint-forming warp thread is guided around the loop-forming mandrel when the rotary body is rotated. In the simplest case, this rotational movement of the rotary body is caused by the actual drive-in movement of the joint-forming warp thread, as the rotary body is designed as a swing mass. In order to possibly be able to inhibit the movement of the rotating body in its bearing and to be able to carry out precise control of the start and end of the rotational movement, a barrier is suitably arranged for Glenne rotational movement, e.g. in the form of a latch or a locking tooth, which can be made active or inactive as desired.

Finally, it is also possible to connect the rotary body with a drive device which can be operated in weaving, so that a forced movement is induced, by means of which the joint-forming warp thread is guided around the loop forming mandrel independently of its own movement.

When the link-forming warp thread is wound around the loop-forming mandrel in the area of the mandrel holder, which, as mentioned, is arranged between the thread guide members and the binding site and is thus located

at a distance from the binding site, it is important that the induced

winding loop e -f year' arrive at the tie-off point. Por-this' purpose

is it appropriate that the loop forming mandrel, starting from the 'bound' part, may not proceed in a straight line, but is bent out. This deflection can take place from the horizontally located weaving plane or Opposite the longitudinal direction of the warp thread, but it conveniently takes place at the same time for both sizes mentioned. The deflection takes place in the simplest case by a permanent deflection of the loop-forming mandrel towards its attachment end.

In what follows, the invention will be described in more detail with reference to an embodiment shown in drawing 6g where the following reference numbers and signs are used:

In the drawing, fig. 1 a side view" of the parts of a weaving machine which are important for the understanding of the present invention in a schematic representation. Fig. 2a and fig. 3a show a side view on a somewhat larger scale of the weaving machine in the area of the attachment point with two different working positions. Fig. and 3b shows a corresponding elevation of the weave and the individual threads so:ci build up in the area of the attachment point for the two above-mentioned working positions. Fig. 4 shows a cross-section through a structural part of the weaving machine according to the invention with a drawn-in work path for the joint-forming warp thread. Fig. 5 shows a longitudinal section through the construction part according to Fig. 4, along the section line V - V on Fig. 4.

In addition to the desired number of warp threads 11, a continuously interwoven weft thread is used for the production of a zipper strip 10. For the production of a zipper joint row 14, a joint-forming warp thread 15 is used, which consists of an initially stretched, continuous plastic string. In the area of the binding site, this is guided in a manner that will be described in more detail, around a loop-forming d<p>r 16 for the formation of screw thread-shaped windings.

As an insertion device for the weft thread 12, a weft insertion needle 17 is used in the present case, as shown in fig. 1 is seen in cross-section. With this, the weft thread is introduced. 12 according to fig. 2a - 3b as a weft thread loop 34. with double thread portions.. Both the tape warp threads 11 and the joint-forming warp thread 15 open to a shell 18 for the passage of the weft thread. In relation to the weaving plane WE which is determined by the line of movement of the weft insertion needle 17 and the impact point of the impact comb 30, and which is drawn with dotted lines in fig. 1, 2a and 3b, the tape warp threads 11 are moved alternately in a raised shell 19 and a lowered shell 20j, while the joint warp thread 15 is at the same time optionally located either in the upper shell 19' according to fig. 2a or in the lower shell 20' according to fig. 3a. For forming the weaving shell 18, in the present case, ordinary weaving shafts 21, 22, 23 are used as thread guiding devices. The number of tissue shafts depends on the type of tissue formation desired. The rod system which serves to move the shafts is designed in the usual way and is thus not shown in more detail.

Depending on the desired weaving pattern, the different warp threads 11 are pulled into laces 24 for the shafts which in the present case are represented by the two weaving shafts 22, 23. In a further weaving shaft 21, the joint-forming warp thread 15 is drawn in.

The tape warp threads 11 are drawn from a thread magazine, not shown in more detail, and are guided around one warp thread redirection rod 26 until the weaving shafts 22, 23". The thread magazine for the joint-forming warp thread is also not shown. This warp thread is guided around a reversing roller 27 and through a feed device 28-, which ensures stepwise feed of the thread depending on the weaving speed. The feed device consists of two rollers with a drive device not shown. When weaving, the shafts 21, 22, 23 are given a rhythmic movement 29 in the direction of the double arrow in fig. 1. In front of the shafts there is a comb 30, through which the warp threads 11 are drawn and whose task is to strike the weft thread 12 against the finished weave after each insertion.

The loop forming mandrel 16 is permanently arranged above the plane WE of the fabric in the area of the warp threads located in the upper shell 19, 19'. The loop forming mandrel 16 does not participate in the rhythmic movement of the warp thread and thus does not change its position in relation to the plane WE of the weave. The rear mandrel, which serves to fasten the mandrel, is stored on a holder arranged between the comb 30 and the shafts 21. In the present case, the fixed arrangement of the holder 32 on one of the loom carriers is not shown in more detail. From fig. 1, 2a, 3a, it appears that the loop forming mandrel 16 has a bend at the contact point of the comb 30, from which it runs parallel to the warp threads which are tied into the fabric over a stretch, before it ends with its outlet end 33 as shown in fig. 1. From fig. 1, 2b and 3b, it appears that the loop forming mandrel 16 is deflected both against the plane WE of the weave and against the direction of the warp thread 11.

With reference to two successive working positions, the weaving process for the slide fastener strip according to the invention is reproduced in the drawing. ' Of each of these working positions, a schematic elevation and a schematic side view are shown next to each other.

In the step shown in fig. 2a and 2b, the joint-forming warp thread 15 is present in its upper shell 19'. During the actual rhythmic movement of the associated loom shaft 21, this warp thread 15 is only on the side of the loop forming mandrel 16 which faces the carrier part 25 - Thereby the other tape warp threads 11 are divided into two groups 11' and 11'' to form a lower 20, respectively an upper shell 19. The entire shell 18 is thus formed, through which the weft insertion needle 17 is now guided to insert the weft thread 12 as a loop 34. The insertion needle 17 always leads the relevant weft thread loop 34 into the shell from the edge zone of the zipper strip 10 which is later provided with the zip joint row 14. On the opposite throw of the weave, on the reverse side 35 of the weft thread 12, there will be a stitch-in loop 36 which is drawn through the loop for the preceding weft insertion, so that at this point a row of stitches is formed which is formed by successive stitch-in loops drawn together.

As will be seen from fig. 2a, the joint-forming warp thread 15 will, by its rhythmic movement in the upper shell 19', be lifted somewhat higher than that which corresponds to the inclined position of the band warp threads 11 and the loop-forming mandrel 16. Thereby comes the joint-forming warp thread 15

in active connection with the mandrel holder J>2. This interaction is discussed in more detail in connection with fig. 4 and 5.

The holder is two-part and consists of a bearing disc 37 which holds the attachment end 31 of the mandrel 16 and a bearing bushing 38, which accommodates the bearing disc and which in the present case is fixedly arranged on one of the loom's carriers. The bearing bushing 38 has an insertion slot 39, as shown in the cross-sectional drawing in fig. 4. But also the bearing disc 37 is provided with a recess 40. The recess 40 and the slot 39 are first created flush with. the path of movement of the joint-forming warp thread 15, this in turn first reaches rectilinear rhythmic movement according to fig. 4 performs its insertion movement 41 in the direction of the arrow shown. The warp thread 15 enters the outlet 40 before it reaches the upper turning point of its movement. The course of the link-forming warp thread with a view to the outlet 40 is shown in fig. 5 indicated by the dash-dotted line through the thread's axis 15. During this striking movement, the thread hits the bearing disk's insertion flank 42 and sets the disk in rotation 43. The bearing disk 37 is thus set in oscillation and moves with the recess 40 into the bearing bushing 38 and thereby creates a passage for the joint-forming warp thread between the bearing disc 37 and the bearing bushing 38 which moves around the loop forming mandrel 16. While the bearing disc 37 rotates 43, the downward movement of the joint-forming warp thread is started via the weaving shaft 21 after the upper turning point for the beat movement has been exceeded. During this downward movement, the recess 40 has once again found its position flush with the slot of the bearing bushing 38 and the original position of the two structural parts of the holder 32 has been achieved again. The joint-forming warp thread 15 now completes its extension movement 44 in the direction of the arrow shown, triggered by the impact movement of the shaft 21.

In the above-mentioned movement of the joint-forming warp thread 15 through the thread passage which is formed by rotation 43 of the holder 32,. a further engagement loop 45 will be formed as shown in fig. 3a and 3b. The rotational movement of the bearing disc 37 occurs about an axis which in this area coincides with the course of the loop forming mandrel 16. In fig. 5, the fastening end 31 1 of the mandrel is in turn rotatably arranged in the bearing disc 37, so that the loop forming mandrel 16 does not have to rotate with the rotation 43 of the bearing disc 37. In fig. 3a and 3b, the next stage of the process when inserting the next weft thread loop 34' is shown. Depending on the weave binding, the warp threads 11 will assume a different distribution in an upper shell 19 and a lower shell 20 than in the previous step, and other tape warp threads will now be in the two thread groups 11', 11'.' which form the upper and lower shells. However, the loop forming mandrel 16 will be on the same side as before. of tissue, plane WE. In the present case, it has not been moved from the position shown in fig. 2a. The joint warp thread 15 has, however, entered the lower shell 20, which is determined by the lower turning point between the two movements 44, 41 shown on. fig. 4. The weft thread insertion needle 17, which now enters the entire shell 18, will now grip over the joint-forming warp thread 15, as will be apparent from the weft thread loop 34' in Fig. 3b, and the warp thread 15 again lies between the mandrel 16 and the tape fabric 25, will be tied to the carrier tape fabric. The loop-forming mandrel 16, on the other hand, does not interact with the link-forming warp thread 15 in this working phase. The stitching loop 36' which arises from the weft thread is connected to the preceding loop, so that a further stitch occurs in the edge zone. '2a bg"2b" is repeated.

The method according to the invention for weaving a zip-lock strip can also include more than two working steps. In the above-mentioned working method, a wrap 45 takes place at every second weft and thus forms a zip link. With the mentioned device, this always happens when the link-forming warp thread 15 is lifted up in the upper shell 19'. However, it would be easy not to induce a winding at each position in the upper shell, but, for example, only "every second time or every third time. For this purpose, only a pusher is needed which is moved back and forth via a simple control device, such as, for example. an eccentric, and which usually closes the slot 39 of the bearing bushing 38 and only releases it when it is desired that the mandrel 16 is wound around. Instead, a locking pulley can be used, which only allows free rotation of the bearing sheave at the desired moments. Finally, mari can arrange a drive for the bearing sheave's rotation in the bearing bush, and set this drive in motion at the desired moments.

It is convenient to make two zipper strips

which will later be united into a complete zip, next to each other in the loom. For this purpose, two strips are conveniently woven as mirror images of each other, with the zipper joint rows facing each other next to each other in the same weaving machine. The two zip strips are preferably joined in connection with the weaving, in the weaving machine itself while they are still under tension. Thereby, unevenness in the zipper strips will be canceled out against each other to a large extent by the simultaneous cancellation of the feed voltage, because the two zipper strips shrink in harmony with each other. Thereby, it is particularly interesting to produce both associated zipper strips using a common loop-forming mandrel, where the two link-forming warp threads are wound around the loop-forming mandrel through a common passage in the weaving stroke.

Finally, the feeding device 23 can be completed with form rollers which cause a cross-sectional change of the joint-forming warp thread 15. In this way, the turning points that face the carrying strap divider 25, as well as the future zipper surfaces that will lie on the opposite side of the mandrel, can be fixed before the actual windings are formed. Thereby, a flat, oval cross-section of the windings is achieved, which makes it possible to let the joints in connection with the zipper rafts run approximately vertically above each other in the front winding part and practically limit

screw the pitch of the line into the rear winding parts with which joints

ken 1H is woven into the "carrier belt. The warp threads in the area of the joint-forming warp thread 15 are designed thicker than the other warp threads for a firmer bond or are arranged in larger numbers, so that here a bead-like pre-thickness is obtained in the fabric,

Claims (19)

1. Method for producing a zipper by weaving, where a continuous plastic string to form a zipper joint row is bent around a loop-forming mandrel in the area of the weaving site and tied to the tape fabric, characterized in that the joint-forming profile string is guided as a shell-forming warp thread (15) forward and to- bake through the plane of the fabric {WE) at the same time as it is rhythmically guided around a loop-forming mandrel (16) and pulled off from the latter in its longitudinal direction and untied with the help of at least one weft thread (12). 2. Method as stated in claim 1, characterized in that the joint-forming warp thread (15) is guided around the untied end of the loop-forming mandrel (16) in one of the two shell sub-areas (19', 20') of the . joint forming warp thread (15). 3. -Procedure as stated in claim 1 or 2, characterized in that. the joint-forming warp thread (15) in addition to the shell-forming movement is rhythmically bent to the side opposite the weft-weave. 4. Method as stated in one or more of claims 1 - 3, characterized in that the joint-forming warp thread (15) is provided with cross-sectional deformations before it reaches the weaving site in a manner known per se. 5- Method as stated in one or more of claims 1 - 4, characterized in that the non-bonded fastening end <31) of the loop forming mandrel (16) is kept on the same side of the plane of the loom (WE) during the weaving stroke movement of the tape warp threads (11). 6-. Method as stated in one or more of claims 1 - 5> characterized in that extra warp threads are tied in a known manner in the area of the rear winding parts of the joint-forming warp thread (15). 7. Method as stated in one or more of claims 1 - 6, characterized in that the weaving stroke movements of the joint forming warp thread (15) are performed on the side of the loop forming mandrel h(-16) which faces the carrier band part (25). 8. "-Procedure as specified in one or more of claims 1 - 7 j- characterized in that: several weft wefts are carried out between successive interlocking loops (45) around the joint-forming warp thread. 9- Method as stated in one or more of claims 1 - 8, characterized in that the joint-forming warp thread (15) is fed forward to the weaving site in a predetermined feed length. 10. Device for use when carrying out the method according to claims 1-9 for the production of a zipper by weaving, where a continuous plastic string to form a row of zipper joints is bent around a loop-forming mandrel in the area of the weaving site, characterized in that the loop-forming mandrel (16) is mounted i. a mandrel holder (32) which is provided with a passage for a joint-forming warp thread, whereby the joint-forming warp thread (15) is guided along in a thread guide (21, 24) which is operated in a weaving stroke. 11. Device as specified in claim 10, characterized in that the loop forming mandrel (16) with its fastening end (31) is. arranged between the guide means (21, 22, 23, 24) for the warp threads (11, 15) and the tying point. 12. Device as specified in claims 10 and 11, characterized in that the mandrel holder (32) consists of a bearing bushing (38) and an insert that accommodates the loop forming mandrel (16) in the bearing bushing with radial clearance. 13. Device as specified in one or more of claims 10 - 12, characterized in that the fastening end (31). of the loop forming mandrel (16) is held in a rotary body, which is provided with an eccentric recess (40) for the joint-forming warp thread (15). 14. Device as specified in claim 12 or 13, characterized in that the insert, respectively the rotating body is designed as a pivoting mass which is driven by the run-in movement (41) of the joint-forming warp thread (15). 15. Device as set forth in claim 12 or 13, characterized in that the insert, respectively the rotary body, is connected to a drive device that can be operated in loom stroke. 16. Device as stated in claim 13, 14 or 15, characterized in that the insert or the rotating body is provided with a controlled blocking. 17- Device as stated in one or more of claims 10 - 16, characterized in that the loop forming mandrel (16) with starting point in its bound part is bent out of the plane of the weave (WE) and/or out of the longitudinal direction of the warp thread. 18. Device as stated in one or more of the claims 10 17, characterized in that in front of the thread guide (21, 2h) for the link-forming warp thread (15) a profile strand feeding device (28) is connected which is controlled in weaving stroke with in advance fixed section length. 19. Device as set forth in claim 18, characterized in that the feeding device (28) for the joint-forming warp thread (15) is provided with a deformation device in a manner known per se.