EP0726342B1 - Gripper loom with guiding means - Google Patents

Description

This invention relates to a rapier weaving machine with guide means for guiding a gripper belt and / or a guide part a gripper according to the preamble of claim 1.

Such guide means are known from EP -A 576.854. Doing so a guide part is provided in the area of the gripper, the one Widening of the gripper belt forms, and that with the comb drawer fortified guide means that provide positive guidance form for the guide part for the gripper, works together. These guide means consist of a hook with a Upper link and a lower link, the upper link with the Top of the guide part and cooperates with the gripper belt and the bottom bracket, the guide member and the Gripper belt supported. The sides of the guide part will be also guided by the management tools.

The guide means according to EP -A 576.854 have the disadvantage that for warp threads in which differently thin threads form one thicker thread were formed, there is a risk that the Guide means get between the individual threads of the warp threads can, which mostly leads to damage and / or a This warp thread breaks. Because the gripper belt and / or that Guide part for the gripper touch the bottom bracket and in the lower link is exposed to wear, leads the fact that such a bottom bracket between the individual threads of the warp thread, mostly to damage and / or a break in this warp thread.

As with the guide means according to EP -A 576.854 the upper link and the bottom bracket locally, at different times and in a different place from their front End is determined by the warp thread area in the shed are introduced, there is also the risk that warp threads between the top plate and the bottom plate of the guide means can guess. These warp threads are used when the on Gripper belt attached gripper is moved through the shed, between the guide means and that guided in the guide means Gripper belt or that in the guide means guided guide part clamped, which usually leads to a break and / or damage to this warp thread.

The object of the present invention is a weaving machine with guide means to create that does not have the aforementioned disadvantages and which significantly reduces the risk of warp thread breaks.

This object is solved by claim 1.

The invention has the advantage that the upper part of the Guide element, the gripper belt and / or the guide part supports and leads over into the shed a certain length almost immediately moves the warp threads apart and happens between warp threads, which is dangerous for breakage and / or damage to warp threads significantly reduced.

In a preferred embodiment, the guide means have in addition to the first Guide element that the gripper belt and / or that Supported guide part for the gripper, a second guide element on that with the top of the gripper belt and / or of the guide part for the gripper works together Upper part has that when it goes through the warp threads into Shed occurs, over a certain length at least approximately parallel to this warp thread runs.

The first guide element and the second guide element can also in the longitudinal direction of the shed at a certain distance be arranged from each other. The guide part will preferably not on the front end of the top of the guided first guide element, whereby this front end does not wear out and the risk of breakage and / or Damage to warp threads is also reduced.

According to a preferred embodiment, the upper part of the first guide elements, that when it passes through the warp threads enters the shed, almost over a certain length runs parallel to the warp threads, and the looper belt one Angle. This has the advantage that in the aforementioned guide elements the gripper belt almost centrally and / or almost can be guided horizontally through the shed.

Fig.1

schematisch eine erfindungsgemäße Greiferwebmaschine mit Führungsmitteln darstellt;

Fig. 2

vergrößert einen Querschnitt gemäß Linie II-II in Fig. 1 darstellt;

Fig. 3

eine Sicht gemäß Pfeil F3 in Fig. 2 darstellt;

Fig.

4 eine praktische Ausführungsform der Führungsmittel im Bereich des Querschnitts IV-IV darstellt;

Fig. 5

eine Draufsicht der Führungsmittel in Fig. 4 darstellt;

Fig. 6

eine praktische Ausführungsform der Führungsmittel im Bereich des Querschnitts VI-VI darstellt;

Fig. 7

eine Sicht der Führungsmittel gemäß Pfeil F7 in Fig. 5 darstellt;

Fig. 8 und 9

in unterschiedlichen Stellungen der Kammlade sowie des Webfaches die Führungsmittel darstellen;

Fig. 10

in einer Sicht analog zu der in Fig. 6 eine variierte Ausführungsform darstellt;

Fig. 11

in einer Sicht analog zu der in Fig. 6 eine weitere variierte Ausführungsform darstellt;

Fig. 12

eine Draufsicht der Führungsmittel in Fig. 11 darstellt;

Fig. 13

eine Variante der Fig. 11 darstellt;

Fig. 14

eine Variante der Ausführungsform in einer Sicht analog zu der in Fig. 5 darstellt;

Fig. 15

eine Sicht gemäß Pfeil F17 in Fig. 14 darstellt;

Fig. 16

eine Variante der Ausführungsform in einer Sicht analog zu der in Fig. 4 darstellt;

Fig. 17, 18, 19 und 20

in unterschiedlichen Stellungen der Kammlade und des Webfaches die Führungsmittel darstellen;

Fig.

eine Variante der Ausführungsform in Fig. 16 darstellt.

In order to emphasize the features of the invention more clearly, the invention is explained in more detail below with reference to a drawing with exemplary embodiments, in which:

Fig. 1

schematically represents a rapier weaving machine according to the invention with guide means;

Fig. 2

1 shows an enlarged cross section according to line II-II in FIG. 1;

Fig. 3

a view according to arrow F3 in Fig. 2;

Fig.

4 shows a practical embodiment of the guide means in the area of the cross section IV-IV;

Fig. 5

Figure 4 shows a top view of the guide means in Figure 4;

Fig. 6

represents a practical embodiment of the guide means in the area of cross section VI-VI;

Fig. 7

a view of the guide means according to arrow F7 in Fig. 5;

8 and 9

represent the guide means in different positions of the comb and the shed;

Fig. 10

in a view analogous to that in Fig. 6 shows a varied embodiment;

Fig. 11

in a view analogous to that in FIG. 6 represents a further varied embodiment;

Fig. 12

Figure 11 shows a top view of the guide means in Figure 11;

Fig. 13

represents a variant of Fig. 11;

Fig. 14

represents a variant of the embodiment in a view analogous to that in Fig. 5;

Fig. 15

a view according to arrow F17 in Fig. 14;

Fig. 16

represents a variant of the embodiment in a view analogous to that in Fig. 4;

17, 18, 19 and 20

represent the guide means in different positions of the comb and the shed;

Fig.

represents a variant of the embodiment in FIG. 16.

The rapier weaving machine presented in FIGS. 1 to 3 has two gripper belts 1, each with a gripper 2 or a slave gripper 3 has been attached. That with drive means 4 driven gripper belt 1 moves the encoder gripper 2 with the weft thread to be inserted in the longitudinal direction A up to Middle of the rapier weaving machine, where the slave rapier 3, which also with a gripper belt 1 driven by drive means 4 will take the weft and to the opposite Side of the rapier weaving machine. The drive means 4, which are arranged in the region of the side frames 5 for example, gear wheels 6 driven with drive elements, that work with the gripper belts 1. The permanent one Contact of the gripper belts 1 with the gears 6 is by guide wedges 7 causes. The rapier weaving machine also has one Kammlade 8 on which a reed 9 is provided, which in the Side frames 5 supports and driven by drive means 10 becomes. The drive means 10 and the drive means 4 can are driven synchronously. In the area of the side frames 5 the gripper belts 1 are arranged by fixed guides 11 guided.

The rapier weaving machine also shows schematically Shed formation means 12, that of shed drive means, not shown, which are synchronous with the comb drawer drive means can be driven, ordered. Furthermore, there are two Warp thread surfaces 13 and 14 are shown, between which a shed 15 is formed to allow a weft to be inserted. These warp thread surfaces 13 and 14 are with the help of Shed formation means 12 formed.

The comb drawer 8 has a drawer axis 16 on which a Shop profile 17 has been fastened with screws. At the The shop profile 17 becomes the reed 9 with fastening means 18 attached. There is also an intermediate profile 21 on the shop profile 17 fastened with screws on which the guide means according to the invention 23 have been attached. This attachment is done with With the help of screws 22 provided by the intermediate profile 21 Slots are enough and the one in the guide means 23 work together provided thread.

The guide means 23 serve to guide the gripper belt 1 and / or a guide part 24 for the gripper. The guide part 24 forms a widening of the gripper belt 1 and is in Area of both the gripper 2 and the gripper 3 intended. These guide means 23 can with the help of Move the comb drawer 8 in and out of the shed 15. The Guide means 23 are located, as with a dashed line Line has been shown in Fig. 2, in one position, at of a registered weft to the stop line 19 of the Fabric 20 is struck. If the guide means 23 through the warp thread surface 14 is inserted into the shed 15 have been formed, they form in the longitudinal direction A of the shed 15 extending guide for the gripper belt 1 and / or the guide part 24.

The guide means 23 according to the invention, as more in detail 4 to 7, a first Guide element 25 on the gripper belt and / or the guide part 24 supports and a second guide element 26, with the top of the gripper belt 1 and / or with the guide part 24 works together for the gripper 2. The top 27 of the first guide element 25 supports the guide part 24.

This upper part 27 has - as was illustrated in FIG. 7 - a rounded or conical shape. In the area of Upper part 27 is also a guide part 28 is provided is located parallel to the gripper belt 1 and allows the Gripper belt 1 between this guide part 28 and the guide surface 29 of the second guide element 26 to guide. The guide part 28 can be flat, or one, as shown have a rounded or cylindrical shape. The leadership area 33 of the guide part 24 forms with the gripper belt 1 an angle D and is guided by and supported over a Part of the length of the aforementioned upper part 27 of the first guide element 25. In the illustrated embodiment, this is Guide part 24 not on the front end 34 of the upper part 27 of the first guide part 25 out. The second guide element 26 has an upper part 30 which, like the upper part 27, has a rounded or conical shape.

The guide member 24 is also laterally between one Guide surface 31 of the guide element 26 and a guide surface 32 of the guide element 25 out. Furthermore, the second guide element 26 a surface 35 and the first guide element 25 a surface 36 which is in the area of Guide part 24 at a certain distance from the lower surface 37 of the guide part 24 and act as an emergency guide surface can. The first guide element 25 also has one Bevel 38 on.

The comb drawer 8 from the stop position to its rear Moved position, the guide means 23 move according to Arrow P. During this movement, the shed 15 is also formed, that is, the angle between the flat warp threads 13 and 14 enlarged during this movement and to Example becomes maximum when the comb drawer 8 is in the rear Position, as shown in Fig. 2, is. The Obtain positions one after the other as shown by a dashed line Line in Fig. 2, in a full line in Fig. 8, in a full line in FIG. 9 and a full line in FIG. 2 have been shown.

In Fig. 8, a position was shown in which the upper part 30 of the second guide element 26, the warp thread surface 14 just touched and through the warp thread surface 14 will happen to enter the shed 15. The top 30 is arranged in such a way that this upper part 30th over a certain length almost parallel to the warp thread surface 14 runs.

9 shows a position in which the upper part 27 of the first guide element 25, the warp thread surface 14 is straight touched and pass through the warp thread surface 14 to enter the shed 15. The top 27 is arranged in such a way that this upper part 27 over a certain length runs almost parallel to the warp thread surface 14.

Due to the arrangement of the upper parts 27 and 30, the guide elements 25 and 26 favorably through the warp thread surface 14 happen. For warp threads where different thin threads are used have been formed into a thicker thread is also avoided that the guide elements 25 and 26 thereby between the single threads can guess that the warp threads each one side of the guide elements 25 and 26 land respectively occasionally remain on it.

The length over which the upper part 27 is almost parallel to the warp thread surface 14 runs, is preferably relatively large and greater than the length over which the upper part 30 runs parallel, because of the risk of breakage and / or damage of warp threads that are created by the upper part 27 is larger than those created by the top 30. This danger is larger because, on the one hand, the upper part 27 is closer to Weave 9 is located as the top 30 and in such a way this upper part 27 less easily between the warp thread surface 14 can penetrate, and on the other hand, because the upper part 27 with the Gripper belt 1 and / or cooperates with the guide member 24 and is subject to wear in such a way.

In rapier weaving machines it is known to have a rapier belt 1 an almost rectangular cross-section so central and / or so to run horizontally as possible through the shed 15. Around To meet the condition and allow the upper part 27 in parallel it is to let the shed enter the warp thread surface 14 required, the gripper belt 1 and the upper part 27, as above mentioned to arrange at a certain angle D to each other. Around to allow this, the guide member 24 has a projection under the gripper belt 1, which has a guide surface 33 is provided, which forms an angle to the gripper belt 1 and with the upper part 27 of the guide element 25 runs parallel. Of the Angle D is such that the distance between the Gripper belt 1 and the upper part 27 of the first guide element 25 increases in the direction of the front end 34 of the guide element 25.

In the example shown, the upper part 30 of the guide element 26 at an angle E with the gripper belt 1, the is a few degrees larger than the angle D that the upper part 27 forms with the gripper belt. It is obvious that this angle D and E from the mutual position of the shed 15, the comb drawer 8 and the guide means 23 depend.

10 shows a variant in which none flat guide part 28 is provided in the region of the guide element 25 is, that is, the top 27 over its full Length has a rounded or conical shape. The The gripper belt 1 is beveled and the guide part 24 provided with a recess. This allows the gripper belt 1 and the guide part 24 through the guide means 23 to let happen. The gripper belt 1 is thereby the upper part 27 in the region of its bevel 39 and can the distance between the upper part 27 and the guide surface 29 smaller than the thickness of the gripper belt 1 can be selected. In in this embodiment, surface 35 is also in such a manner arranged to be parallel to the warp thread surface 14 in the shed 15 occurs. However, the latter is superfluous if the Area 35 is completely shielded from the upper part 30.

According to a variant not shown, the bevel can 39 extend over the entire width of the gripper belt and cooperate with the upper part 27 of the guide means 23.

11 and 12, a variant is shown, at the guide means 23 consist of guide elements 25 and 26, those in the longitudinal direction of the shed 15 in the same Distance are provided, that is, in a vertical Area. The upper part 27 can simply be in the area the opening formed by the guide element 26 between the Warp threads 14 enter the shed 15. To the entry of the To facilitate upper part 27, there is the upper part 30 - like has been shown in Fig. 12 in a plan view - preferably almost in line with the upper part 27. The upper part 27 needs only almost parallel to the warp threads 14 in the Shed 15 to enter.

11, the distance X between the upper part 30 and the upper part 27, in the direction of the upper part 30 or in the direction of the warp thread surface 14, if that Upper part 30 passes through the warp thread surface 14. Of the Distance X has a value on the order of magnitude of the gripper belt, for example a few millimeters. Since the distance X is relatively large, the risk is relatively low, that a warp thread between the guide elements 25 and 26th device.

13 shows a variant of FIG. 11, at an undercut 40 is provided in the guide elements 23 is. In the case where there is a warp thread between the guide elements 25 and 26 device, this can be in the area of the undercut 40 and thus in a position in which the guide part 24 do not touch or break this warp thread and / or damage. It was the length of the top 27 chosen in such a way that the guide member 24 the whole Upper part 27 leads and has the upper part 27 over its whole Length a rounded or conical shape. The gripper belt 1 has a recess 47 which corresponds to the provided in the guide part 24 shown in FIG. 10 Recess has been executed.

14 and 15, a variant is shown in which the Upper part 27 has a rounded or conical shape. From the middle of this upper part 27, the guide element 25 for Top beveled so that the rounded or conical upper part 27 to a narrow, cylindrical Guide part 28 narrowed. This embodiment offers the Advantage that there is a risk of a warp thread on the guide member 28 remains relatively low, which increases the risk that such a warp thread from the looper belt 1 and / or the guide part 24 can be damaged and / or broken, relatively is low.

According to a variant not shown, the upper part 30 analogous to the upper part 27 shown in FIGS. 14 and 15 be carried out.

The above-mentioned illustrated embodiments can be favorable be used for fabrics in which each weft insertion all the warp threads of the warp thread surface 14 to the warp thread surface 15 to be moved and vice versa. These are so-called One-one bonds. In the case where bonds are formed in which with successive weft thread entries warp threads 14, through which the guide means 23 into the shed 15th enter, stand still, it may be cheaper in the 16 to 21 illustrated embodiments to apply.

16 shows a variant in which the guide element 25 has two tops 41 and 42, these Upper parts 41 and 42 are arranged at an angle to one another. The guide element 26 also has two upper parts 43 and 44 on, which are also arranged at an angle to each other.

17 to 20 are successive positions of the in the guide means 23 shown in FIG. 16 and the warp threads shown. The bond formed with the warp threads is for Example such that during successive weft entries Warp thread surfaces 13 and 14 remain in their end position and warp thread surfaces 45 and 46 between the warp thread surfaces 13 and 14 move. Such bonds are well known. Here the angle difference between the warp thread surfaces 13, 14, 45 and 46 presented relatively large for clarity. In In reality, this difference in angle is usually smaller.

17, the guide means 23 are shown in one position, in which the upper part 43 of the guide element 26 the Warp thread surface 14 through which this guide element 26 enters the shed 15, just touched. Is located the upper part 43 almost parallel to it over a certain length Warp thread surface 14. In this position the Warp thread surfaces 45 and 46 on warp thread surfaces 13 and 14, respectively to.

Then, as shown in FIG. 18, the guide element occurs 25 through the warp thread surface 14 into the shed and the upper part 41 is almost over a certain length parallel to this warp thread surface 14. Then occurs how shown in Fig. 19, the guide member 26 by the Warp thread surface 46 into the shed 15, the upper part 44 over a certain length almost parallel to this warp thread surface 46 runs. Then, as shown in the Fig. 21, the guide element 25 also through the warp thread surface 46 through into the shed 15, the upper part 42 over a certain length almost parallel to this warp thread surface 46 runs.

Depending on the angle difference between the warp thread surfaces 13, 14, 45 and 46, it is also possible for the guide element 26 already passed through the warp thread surfaces 14 and 16, before the guide element 25 passes through the warp thread surface 14.

16 it is shown that the guide part 24 Upper part 42 does not touch, in such a way that the Guide part 24 is only supported by the upper part 41. This is favorable for bindings where successive Weft entries, for example, fewer warp threads in the Warp thread surface 14 remain as that warp threads with Move warp thread surface 46 because of the risk of Breakage and / or damage to warp threads in the Warp thread areas with the largest number of warp threads the largest is.

It is obvious that in the case where there are more warp threads in the Warp thread surface 14 remain as that warp threads with Move the warp thread surface 46, preferably the guide part 24 is supported by the upper part 42. Of course, according to a further variant, the guide part 24 has a shape, which allows this guide member 24 from both tops Support 41 and 42.

FIG. 21 shows a variant of that shown in FIG. 16 Shown embodiment, wherein the guide member 26th a top 30 with a direction that averages is the direction of the tops 43 and 44 of FIG. 16. The direction of the upper part 30 was chosen so that this Upper part 30 when it through the warp thread surfaces 14 and 46 in the Shed 15 occurs almost parallel over a certain length this warp thread surfaces 14 and 46 runs. This means that the angle between the upper part 30 and the two warp thread surfaces 14 and 46 is low. This embodiment is preferred when the angle between the two warp thread surfaces 14 and 46 small and the length of the upper part 30 are relatively short.

In this embodiment, the guide element 25 has an upper part 41 which, when it passes through the warp thread surface 14, runs almost parallel to this warp thread surface 14, and an upper 42 which, when passed through the warp thread surface 46 passes through, runs almost parallel to this warp thread surface 46. By providing two successive top edges or tops 41 and 42 on the guide member 25 it is possible that both upper edges 41 and 42 with relatively large Lengths parallel or at least approximately parallel to the warp thread surfaces 14 or 46 can be executed.

According to a further variant similar to that shown in FIG. 4 The embodiment is the guide element 25 with a Provided upper edge 27, which penetrates between the warp threads the warp thread surfaces 14 and 46 over a safe length approximately parallel with both of these warp thread surfaces 14 and 46 runs. The angle of this upper part 27 can be in relation to the gripper belt 1, for example, the average angle of the Upper parts 41 and 42 shown in FIG. 21 correspond. According to a variant, this angle of this upper part in with respect to the gripper belt 1 was also chosen in such a way be that the upper part parallel to the warp thread surface 14 or 46, which each has the most warp threads, as well as almost runs parallel to the other warp thread surfaces. These variants are possible if the angle difference between the warp thread surfaces 14 and 46 at the time when the guide member 25 in through these warp thread surfaces 14 and 46 the shed 15 occurs, is low.

It is known, when weaving fabrics that have a width, which is smaller than the maximum weaving width for which the Weaving machine was built, the fixed guides 11 as close as possible to the reed. In the present It is cheaper, guide means according to the invention 23 between the gears 6 and the fixed guides 11, around the gripper belt 1 between the gear 6 and the to guide fixed guides 11 instead of having fixed guides 11 with a longer length, which is close to the gears 6 extend, are provided.

Despite the fact that in the illustrated embodiments the guide means 23 have been attached to the intermediate profile 21 nothing prevents it, for example shims to be provided between the guide means 23 and the intermediate profile 21, around the various guide means 23 at a desired one Position or with a desired angular rotation to attach to the intermediate profile 21. This allows tolerance deviations to balance and / or adjust games appropriately can.

The rapier weaving machine according to the invention is of course limited not to the embodiments described as an example and can in various ways in the course of the invention other shapes and dimensions can be realized.

Claims (14)

1. Rapier weaving-machine with guiding means (23) for guiding a flexible rapier-strip (1) and/or a guiding section (24) of a rapier (2, 3), which are attached onto a sley device (8) and can be carried, between warp threads (14, 46), into the shed (15), in order to form guiding, in the lengthwise direction of the shed, for the flexible rapier-strip (1) and/or the guiding section of the rapier (2, 3), whereby the guiding means (23) have a guide-element which supports the flexible rapier-strip and/or the guiding section (24) of the rapier (2, 3) and which has an upper section (27, 41, 42) which enters into the shed (15), between warp threads,
   characterized in that
   an upper section (27, 41, 42) has an upper rim which, during entry into the shed, runs parallel to a warp-thread surface (14, 46), over a set length.
2. Rapier weaving-machine in accordance with claim 1, characterized in that a second guide-element (26) is provided, which functions together with the upper side of the flexible rapier-strip and/or the upper side of the guiding section (24) of the rapier (2, 3 ) and, itself, has an upper section (30, 43, 44) which, if it enters, through the warp threads, into the shed (15), runs parallel, over a certain length, to a surface (14, 46) of warp threads.
3. Rapier weaving-machine in accordance with claims 1 or 2, characterized in that the above-mentioned upper section (27, 41, 42), of the guide-element (25), forms, with the flexible rapier-strip (1), an angle (D).
4. Rapier weaving-machine in accordance with claim 3, characterized in that the flexible rapier-strip (1) is carried approximately centrally and/or approximately horizontally through the shed (15).
5. Rapier weaving-machine in accordance with any one of claims 1 to 4, characterized in that, in the area of the rapier (2, 3), a guiding section (24) is provided, which has a guide-surface (33) functioning in connection with an upper section (27, 41) of a first guide element (25), and forms an angle in relation to the flexible rapier-strip (1).
6. Rapier weaving-machine in accordance with claim 5, characterized in that the guiding section (24) is not guided towards the front end (34) of the first guide-element (25).
7. Rapier weaving-machine in accordance with any one of claims 1 to 6, characterized in that the distance, between the flexible rapier-strip (1) and the upper section (27, 41, 42) of the first guide-element (25), increases towards the end (34) of the first guide-element (25).
8. Rapier weaving-machine in accordance with any one of claims I to 7, characterized in that the first guide-element (25) and the second guide-element (26) are disposed, with a certain separation between them, in the lengthwise direction (A) of the shed (15).
9. Rapier weaving-machine in accordance with any one of claims I to 8, characterized in that the flexible rapier-strip (I) is guided between the first guide-element (25) and a guide-surface (29) of the second guide-element (26).
10. Rapier weaving-machine in accordance with claim 9, characterized in that the flexible rapier-strip (1) is guided between a guide-section (28), which is provided on the first guide-element (25), and a guide-surface (29) of the second guide-element (26).
11. Rapier weaving-machine in accordance with any one of claims 1 to 10, characterized in that the guide-element (25), which supports the flexible rapier-strip (1) and/or the guiding section (24) for the rapier (2, 3), has an upper section (27, 41, 42) which, if it enters, through the warp-thread surface (14, 46), into the shed (15), runs approximately parallel, over a certain length, to the said surface of warp threads (14, 46).
12. Rapier weaving-machine in accordance with claim 12, characterized in that the guide-element (25) has two upper sections (41, 42) which, in each case, if they enter, through the warp-thread surface (14, 46), into the shed (15), run approximately parallel, over a certain length, to the said surface of warp threads (14, 46).
13. Rapier weaving-machine in accordance with any one of claims 2 to 12, characterized in that the second guide-element (26), which functions together with the upper side of the flexible rapier-strip (1) and/or the guide section (24) for the rapier (2, 3), has an upper section (30, 43, 44) which, , if it enters, through the warp-thread surface (14, 46), into the shed (15), runs approximately parallel, over a certain length, to the said surface of warp threads (14, 46).
14. Rapier weaving-machine in accordance with any one of claims 13, characterized in that the guide-element (26) has two upper sections (43, 44) which, in each case, if they enter, through the warp-thread surface (14, 46), into the shed (15), run approximately parallel, over a certain length, to the said surface of warp threads (14, 46).

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