EP3322845A1

EP3322845A1 - Weaving machine

Info

Publication number: EP3322845A1
Application number: EP16732269.2A
Authority: EP
Inventors: Andreas Rutz
Original assignee: Lindauer Dornier GmbH
Current assignee: Lindauer Dornier GmbH
Priority date: 2015-07-13
Filing date: 2016-06-22
Publication date: 2018-05-23
Also published as: CA2990732A1; TWI599691B; KR20180030623A; DE102015213015B3; JP2018524491A; US20180179675A1; AU2016293350A1; TW201708648A; CN107849761A; RU2018105076A; WO2017009015A1

Abstract

The invention relates to a weaving machine with a shed forming device (10, 25) for forming sheds (3) between warp threads (1) drawn from a thread supply (9); a weft inserting device (20) for inserting weft threads (2) in the form of tapes into the formed sheds (3); and a drawing device (30) for drawing the fabric (4) made of warp and weft threads (1, 2) after the weft threads have been inserted. The weaving machine comprises a measuring device (40) for detecting geometric parameters, in particular the width, of a weft thread (2) prior to being inserted into the shed (3), and the weaving machine also comprises an analyzing device (45) for analyzing the detected measurement results. A controller (50) which is connected to the drawing device (30) is provided on the weaving machine in order to control the movement of the fabric (4), including the drawing process, on the basis of the analyzed measurement results.

Description

loom

The present invention relates to a weaving machine for the processing of tapewise weft threads - i. relatively wide and flat, band-shaped textile units, according to the preamble of claim 1. Here are the

Shedding device, the weft insertion device and the essential parts of a trigger device known devices on weaving machines. Also, the construction of a fabric of warp and weft threads in the form of tapes, such as carbon or fiberglass tapes, has been known for some time. Such tapes are made for example of carbon rovings, which are solidified in the spread, parallelized state with an impregnation. The width of such tapes is e.g. a few millimeters to more than an inch. Fabrics made of carbon tapes are used, for example, for lightweight construction applications in the aircraft or motor vehicle sector.

In the present case, both the terms "weft" and "tape" are used, since the invention relates to the entry of weft threads in the form of tapes.

For the warp threads can be used any threads, for

Example also wide and / or thick threads, but preferably threads in the form of tapes.

For the insertion of weft threads in the form of tapes in an open, formed by raised and lowered warp shed gripping gripping and clamping devices are provided, which take the front tape end coming either from the entry side or from the opposite side (through the open shed) coming and pull through the shed.

In the embodiment according to EP 183891 1 A1, the registered tape in Thread clamps clamped on both sides of the shed and is transported by moving these thread clamps by a fixed predetermined distance in web or take-off direction (machine direction) to the rear edge of the fabric or to the binding point of the fabric. Since only the outer ends of the tapeförmigen weft thread detected and in the direction of the

Tissue trailing edge to be transported, consists in the EP

183891 1 A1 described method in principle the risk that the tapes over the fabric width away not absolutely straight to the

Tissue trailing edge are brought, but that the fabric-lying area of the shot tapes in the tissue plane forms an arc. In the weaving machine according to EP 183891 A1, an attempt is made to reduce this effect by extending the warp threads in the vertical direction through the weaving machine, wherein the shot tapes with their

Width direction are also arranged vertically and are entered above the existing fabric trailing edge in the shed. Of the

Transport of the registered tapeförmigen weft threads to

Tissue trailing edge is thus supported by gravity acting on the tapes. DE 10201 1009765 B3 discloses an apparatus and a method in which the fabric is moved back in the direction of the just entered weft thread weft by a predetermined distance against the weaving direction until the front longitudinal edge of the tape and the rear fabric edge abut each other.

In both cases, after the weft insertion a crossing of the

Warp threads with the weft threads by closing and opening the shed by means of the shed forming device. The fabric, which has now been extended by one tape width, is moved on or off a little to make room for the next weft insertion.

A disadvantage of such fabrics produced may be that after the Weft insertion the subsequent positioning of the tapeförnigen

Weft threads with respect to the tissue trailing edge regardless of the actual instantaneous geometry of the tape is done.

In practice, tapes with widths of for example 20 mm - 50 mm are used. Such tapes have - caused by the nature of the

Production - a certain - no longer negligible - dispersion in the width over the length of the tape.

For certain applications, it may also be advantageous to use tapewise weft threads with specifically selected, different widths within a fabric alternately or in a predetermined sequence.

There are also tissues where between successive

tapewormed wefts should exist a certain predefined distance. If the width of the tapes fluctuates, there is a risk that this distance will not be uniformly equal to the predefined value.

EP 183891 A1 discloses a device with sensors which measures the width of the tapes in weaving operation. Depending on the measured width special feeders for the warp threads are controlled such that the winding of the fabric without tension or even with a

Excess of warp threads can take place. An exact positioning of the longitudinal edge of the tapewise weft threads without spacing or with a predetermined distance from the rear edge of the fabric depending on different widths of the tapeformed weft threads is thus not possible.

It is an object of the present invention to provide a weaving machine in which the fabric formation using tapewise

Weft threads to different geometric parameters of the tapes, especially adaptable to different widths.

This object is achieved by the features of claim 1. In this solution, the advantages are, in particular, that in particular the actual width and in particular the width variations in the

Tissue to be inserted tapes, since the tape and the tissue on the basis of the evaluated measurement results with varying - and not according to the prior art

predetermined - path feed can be moved towards each other. In this way, for example, a more closed tissue image can be obtained, for example in the event that the instantaneous width of the tap to be inserted should be reduced.

Overall, increased by the invention, the flexibility for the

Weft insertion considerably, since the trigger means on the

Control means can be given on the basis of the evaluated measurement results commands for the tissue advance, which take into account the respective actual tape width. Alternatively, but preferably in addition to the width detection is the

Measuring device designed to detect other geometric measures, such as holes and / or splices in the weft, the latter caused by detachment of single or multiple filaments of the tape composite.

According to an advantageous embodiment of the invention is based

Measuring device on an optical measuring method. This may in particular be an optically scanned measuring field, which preferably extends over the width of the tape. A corresponding measuring device is for example a precision optical micrometer. According to an alternative, the measuring device works acoustically,

especially with the help of ultrasound. Depending on the wave propagation of the ultrasound can be concluded on the width of the scanned tapes.

Also conceivable is a line scan camera with combined

Pattern recognition software.

Another method of measurement is based, for example, on more tactile - ie non-contactless - scanning of the weft thread (tapes) to be entered.

Particularly preferably, the measuring device is designed such that the width of the weft to be measured before and / or during its entry is detected continuously. This way is a permanent one

Measurement possible, where all variations to the tape width can be detected. The corresponding evaluation options are considerably extended as a result.

The measuring device according to the invention is preferably arranged such that it is capable of measuring width values of the weft thread to be inserted next and / or of the currently inserted weft thread, wherein the

Measurement on moving weft over the entire length to be entered is vornehmbar. By this measurement can directly on the

On the basis of the evaluated measurement, the tissue is moved on this tape by a distance dependent on the evaluation result.

Subsequently, the fabric including the previously registered tape is fed in the warp direction. For these transport operations, a drivable take-off roll and advantageously also a fabric clamp are provided as part of the take-off device. The tissue clamp is advantageously arranged in the region of the tissue-trailing edge extending in the weft direction and prevents the tapewormed weft threads last introduced into the tissue from being displaced during the tissue displacement. In the event that the aforementioned relative to each other to move tape and tissue is not performed (for example, because the distance between the tape and tissue already as desired), the

Triggering device, the tissue including the previously registered tap immediately move in the haul-off direction by a dependent of the evaluation result route or advance.

To produce a reversing tissue displacement, it is advantageous, instead of a reversing rotation of the take-off roll a

Oscillation of intermediate deflection rollers in the

Kettfadenverlauf or provide in the fabric progression. The extraction device comprises in this case a pendulum mounted and reversibly driven deflection roller, which is arranged in the fabric path between the shed or between the fabric clamp and the driven take-off roll.

Preferably, the measuring device is on the entry side of

Weft thread or tapes arranged and this advantageously aligned in the warp direction, ie transverse to the weft direction. The measuring device is thus accommodated even in confined spaces and yet able to reliably detect the entire width of the weft threads.

Alternatively, the measuring device is arranged below and above the warp threads and in this case advantageously in the area of those

Fabric longitudinal edge, which is crossed by the tape when weft insertion first. In this way, the currently drawn through the shed tape can be measured almost over its entire length in terms of its width. The evaluation device is preferably designed such that it

Minimum width and / or the maximum width of the weft thread to be entered is able to calculate. From all recorded measurement data to one Weft, these extreme values can be easily determined in order to control the trigger device according to the desired fabric image, for example, to generate a desired, constant distance between the successive weft threads. For this purpose, the maximum width of the current weft thread is determined and the

Fabric transport in the forward direction (possibly with previous transport in the backward direction toward the tape) adjusted according to the desired distance. Alternatively or additionally, the evaluation device is advantageously designed such that it is able to calculate a mixed value based on a plurality of measured values of a weft thread to be introduced or inserted, in particular its average width. When using this mean value, the withdrawal device can be controlled in such a way that a uniform optical weave pattern is obtained with the spacing of the currently last inserted weft thread or tape with respect to the tissue trailing edge matched to said mean values. In this case, this distance can also be set such that the respective weft thread rests against the fabric trailing edge in accordance with the determined mixed value, depending on the width variations of the tape and the contour of the rear one

Fabric edge possibly with gaps.

As an alternative to or following a relative movement of weft thread and fabric last entered, the fabric can be moved before entry of the next weft thread by means of the controlled withdrawal device, such that the next weft thread over its entire weft length without any gap formation with the

Tissue trailing edge or at a distance to the tissue trailing edge is registered.

Also, with existing width variations of the tapes fabric images can be realized in which the tapes partially with their two Long edges abut the adjacent tapes, while narrower tape sections form corresponding gaps.

Advantageously, the evaluation device and / or the

Control device designed and arranged to stop at least the further weft insertion and withdrawal device when exceeding and / or falling below predetermined weft widths and / or output a predetermined signal. The evaluation unit and / or the

Control means are thus preferably able to stop the weaving process on the basis of determined extreme values with regard to the tape width, in order thus to avoid faulty production.

Similarly, the evaluation device is preferably designed such that it errors of the shot to be entered,

For example, holes and / or splices, can detect to trigger a predetermined action of the loom in such a case. Such an action may be, for example, stopping the

Weft insertion device and / or the output of a signal to summon example, machine operators.

In the following the invention will be described in more detail with reference to an embodiment. Show it:

Figure 1 is a schematic plan view of a loom

FIG. 2 shows a schematic view of the loom according to FIG. 1 from the feed side of the warp threads

Figure 3 is a schematic cross section through the loom according to

Figures 1 and 2 with viewing direction in the weft direction.

In Figures 1, 2 and 3 is a loom for warp and weft threads in Shape of tapes shown schematically. The tapes consist for example of carbon and / or glass fibers. Such a weaving machine is also called a tape weaving machine. The embodiment of the loom described here can alternatively also be used for such fabrics in which only the weft threads in

Form of tapes are present, while the warp threads come in the usual thread form, but preferably in the form of coarse, that is thick and / or wide threads used. Several adjacent warp threads 1 are rotating

Stock spools 9 held and in the warp direction 6 (also called machine direction or Webrichtung) transported to a shedding device 10, 25. This includes strands, not shown, through which the warp threads 1 are threaded therethrough. The strands are preferably drawn in - shown schematically as a frame - Webschäfte 25 and with

Help of a drive 11 alternately raised or lowered, so that the guided through the strands warp threads 1 form a shed 3 in a known manner between them. If one half of the warp threads 1 are deflected in their upper maximum position and the other half in their lower maximum position, a weft thread 2 can be guided through the shed 3 thus formed. To store the weft thread 2, in the present case as a tape, a supply reel 7 rotating about an axis of rotation 8 is provided, which is placed on one side of the weaving machine. The warp threads 1 can instead of the supply spools 9 alternatively also on a common storage means, e.g. a warp beam, be held up.

For insertion of a weft thread 2 in a shed 3, a weft insertion device 20 is provided which comprises a drive 22, a gripper bar 24 connected to the drive 22 and a gripper head 23 provided at the free end of the gripper bar 24. The gripper bar 24 is movable by means of the drive 22 back and forth through the open compartments 3. Instead of a rapier rod 24, it is alternatively also possible to use a rapier band but it may be necessary to guide it on its way through the shed.

Before the weft insertion, the weft yarn 2 provided by the weft yarn package 7 is first held in the region of its free end by means of a clamping and cutting device 21 shown only schematically, whereupon the gripper head 23 passes through the shed 3 and grips and clamps this free end of the weft yarn 2 , The clamping and cutting device 21 in turn then lets go of the free end of the weft thread 2, so that the rapier head 23 can pull the weft thread 2 through the shed 3. Then, the shed 3 is closed by moving the warps 1 downwards and upwards, respectively. In addition, the clamping and cutting device 21 clamps the weft thread 2 on the side of the weft thread bobbin 7 and separates the previously inserted weft thread 2 from the endless weft thread 2 made available by the weft thread bobbin 7.

In the figure 2 is shown schematically from the back of the loom from the shed 3, that alternately up and down moving warp threads 1 is formed, thus nachzulieferter of the weft yarn package 7

Weft 2 can be funded by the shed 3. For clamping and releasing the clamping jaws of the rapier head 23 to a only schematically indicated pivot point 29. Of course, purely linear movements of the jaws of the rapier head 23 are conceivable. Clamping and loosening of the jaws can for example be done by means of a mechanical control device which is arranged outside the shed; However, there are also pneumatic or electro-mechanical control devices possible. In an alternative, not shown, the weft 2 of a

Gripper grabbed that has not previously driven through the shed in the direction of the weft thread, but on the side of the weft yarn package is arranged there detects the weft end, transported by the shed, lets go of the weft thread and then moves back without weft in the direction of the weft yarn coil. The registered weft thread 2 is still bind to the fabric 4. For this purpose, before or during the closing of the shed 3, the fabric trailing edge or the binding point 5 with the fabric 4 in the direction of the registered weft yarn 2 to move. For this purpose, the fabric 4 is pushed over its entire width against the warp direction 6 by a backward path 38 to the previously entered weft thread 2 until, for example, the fabric trailing edge 5 bears against the longitudinal edge of said weft thread 2. Preferably, the tissue 4 is thereby clamped by means of a tissue clamp 36 driven by a drive 35 (see Figures 1 and 3). Subsequently, any existing clamping is lifted by the tissue clamp 36 and this still further against the

Warp direction 6 advanced so far that the fabric clamp 36 can grasp the said weft thread 2 and clamp. Subsequently, the fabric clamp 36 together with the clamped fabric 4 in the warp direction 6 is moved around the forward path 39, so that the next shed 3 can be formed.

The thus steadily growing fabric 4 is wound on a take-off roll 32 which is driven in rotation by a drive 31 about a rotation axis 33. In order to produce the forward and backward movement of the fabric 4, in the present embodiment, a pendulum movement of intermediate deflection rollers 34, 37 realized in Kettfadenverlauf or in the fabric progression. This oscillating movement of the guide rollers 34, 37 is presently actively realized with a reversing pivot drive (not shown in the figures), the two guide rollers 34, 37 moves synchronously.

The take-off roll 32 and the fabric clamp 36 and possibly the guide roller 34 are part of a take-off device 30, wherein the drives this Facilities must be matched exactly. This is done by a control device 50 (see below for this in connection with the explanation of the invention).

The guide roller 34 is arranged in the fabric path between the shed 3 and the take-off roller 32. In this area is also the

Tissue clamp 36, which is preferably arranged in the region of the tissue trailing edge 5.

The optional Umkenkwalze 37 is disposed in the rear region of the loom between the heald frames 25 and the supply reels 9.

In principle, it is also possible to dispense with a pendulum movement of the guide rollers 34 and 37, in which case the forward and backward movement of the fabric 4 must be effected by appropriate control of the drive 31 for the take-off roller 32. For the compensation in the rear area of the machine then e.g. corresponding drives for the supply spools 9 required.

It has now been shown that in particular the width of the weft threads 2 varies due to the production, so that at fixed predetermined distances 38 (for the backward movement) and 39 (for the subsequent

Forward movement) uneven fabric images arise, which is not desirable for all applications.

According to the invention, therefore, a measuring device 40 is provided for detecting geometric parameters, in particular the width, of the weft threads 2 prior to their entry into the respectively formed shed 3. In the present embodiment, the measuring device 40 is provided between the weft yarn package 7 and the clamping and cutting device 21 below the weft yarn 2.

In the present case, the measuring device 40 is based on an optical measuring principle and in this case scans the weft thread 2. For example, the Measuring device 40 may be formed as a precision optical micrometer. The optical signals reflected back from the weft yarn 2 are received by the measuring device 40. Alternatively or additionally, a receiver 41 is arranged above the weft thread 2 (shown in dashed lines in FIG. 2). In principle, measuring devices 40 for detecting geometric parameters of an elongated sheet-like structure such as those of a tape are known and need not be explained in more detail here. In the present case, the measured values or measurement results acquired by the measuring device 40 are forwarded to an evaluation device 45, which evaluates the measurement results and forwards the results of the evaluation (which are also referred to herein as evaluated measurement results) to a control device 50. The control device 50 is in communication with the extraction device 30 and controls the movements of the

Fabric 4, by controlling the oscillating back and forth movement of the guide rollers 34, 37 and possibly the tissue clamp 36 and also the winding of the fabric 4 on the take-off roller 32. Here, the control device 50 is connected to the drive for the pendulum movement of the guide rollers 34, 37 in conjunction and possibly with the drive 35, the

Tissue clamp 36 drives, as well as to the drive 31, which drives the take-off roll 32,

It should generally be noted that the signal and control lines in FIGS. 1 and 2 are shown with dash-dotted lines.

The measuring device 40 is preferably designed for continuous measurement of the geometry of the weft thread 2. Thus, all deviations from the ideal shape (width, holes, lateral flaking) are reliably detected. In this case, the measurement is preferably carried out when the weft thread 2 is guided past the measuring device 40. The continuous measurement here also expediently comprises the measured values of that portion of the weft thread 2 located in the measuring range which belongs to the weft thread 2 to be inserted next), while the latter is still clamped by the clamping and cutting device 21. The relevant measured values are also preferably taken into consideration by the evaluation device 45, so that measured values are present over the entire length of the weft thread 2 to be introduced next.

The evaluation device 45 is preferably designed such that it is able to calculate the minimum width and / or the maximum width of the weft thread to be introduced. Alternatively or additionally, the evaluation device 45 can calculate, for example, a mixed value based on a plurality of measured values of a weft thread 2, in particular its mean width value.

Based on the evaluations of the evaluation device 45, the drive of the deflection rollers 34, 37 and possibly the drive 35 of the tissue clamp 36 can be controlled by the control device 50 to the tissue 4 based on the determined weft width (for example, based on the determined extreme values for weft width or a mixed value) to drive back an adapted distance 38 against the warp direction 6. Also, the subsequent counter-movement 39 of the fabric 4 in the warp direction 6 is adjusted accordingly, so that the forward link 39 as well as the reverse link 38 varies depending on the evaluation. In contrast to the prior art thus no constant, predetermined movements of the fabric 4 are provided after each weft insertion, but adapted to the actual width of each previously entered weft yarn movements. The winding of the fabric 4 on the take-off roll 32 and the pendulum movement of the guide roller 34 between take-off roll 32 and fabric clamp 36 are dependent on the currently determined Weft width controlled.

The drives with which the various movements of the previously described assemblies of the loom are controlled, are preferably designed as individually controllable motors or motor-gearbox combinations, preferably their signals from the

Control device 50 get. These drives are designed so that they - as needed - perform reversing pivotal rotary or linear movements. The control device 50, the trigger device 30, in particular the

Deflection roller 34 and the tissue clamp 36, drive such that the tissue 4 is placed in a variety of ways before the next weft insertion. For example, it is possible that the fabric 4 - by constantly taking into account the width of the respective weft threads 2 - has no gaps. Alternatively, the fabric 4 will be next to each other

Weft insertion placed so that there is always a distance of each weft yarn 2 to the fabric trailing edge 5, so that a fabric image with gaps between successive weft yarns 2 results. According to a further alternative, the draw-off device 30 is controlled in such a way that one or more gaps with the fabric trailing edge 5 are formed along the currently entered, width-varying weft thread 2, wherein in the remaining regions this weft thread 2 abuts the fabric trailing edge 5 and / or even with the tissue trailing edge forms 5 overlap areas.

Mixed forms of the above-mentioned tissue images by appropriate adjustment of the control device 50 are readily possible.

The evaluation device 45 and / or the control device 50 are preferably designed and set up, at least the other one

Weft insertion and the trigger device 30 when exceeding and / or falling below predetermined weft widths stop and / or a output specified signal. Likewise, it is advantageous if the evaluation device 45 can detect defects of the weft thread 2 to be introduced, for example holes and / or splices, and can trigger a predetermined action of the weaving machine, in particular via the control unit 50.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as a combination of features, even if they are shown and described in different embodiments.

LIST OF REFERENCE NUMBERS

1 warp threads

2 weft threads (tapes)

3 shed

4 tissues

5 tissue trailing edge

6 warp direction

7 weft bobbin

8 axis of rotation

9 supply spools

10 shedding device

11 Drive for shedding device

20 weft insertion device

21 clamping and cutting device

22 Drive for gripper

23 gripper head

24 gripper bar

25 Webschaft

29 pivot point

30 extraction device

31 Drive for take-off roller

32 take-off roller

33 axis of rotation

34 guide roller

35 Drive for tissue clamp

36 tissue clamp

37 guide roller

38 reverse distance

39 forward distance

40 measuring device

41 recipients Evaluation device Control device

Claims

claims

1 . Loom with

a shedding device (10) for forming sheds (3) between warp threads (1) drawn from a thread supply (9),

a weft insertion means (20) for introducing weft threads (2) in the form of tapes into the formed sheds (3), and

a take-off device (30) for removing the fabric (4) formed by warp and weft threads (1, 2) after a weft insertion,

marked by

- A measuring device (40) for detecting geometric parameters, in particular the width of a weft thread (2) before its entry into the formed shed (3),

- By an evaluation device (45) for evaluation of the detected

Measurement results, as well

- By one with the trigger device (30) in connection standing

Control means (50) for controlling a movement of the fabric (4) including the trigger based on the evaluated

Measurement results.

2. Weaving machine according to claim 1, characterized in that the

Measuring device (10) based on at least one of the following measurement methods:

- An optical measurement method, wherein the measuring device (10) is preferably designed in the form of a precision optical micrometer, and / or

an acoustic, in particular ultrasonic,

Measuring method, and / or

- a tactile measurement method.

3. loom according to at least one of the preceding claims, characterized in that the measuring device (40) is formed and arranged to continuously detect the width of a weft thread (2).

4. weaving machine according to at least one of the preceding claims, characterized in that the measuring device (40) is arranged such that it is able to measure width values of the next to be introduced weft thread (2) or a weft thread (2) during its entry, wherein the measurement on the moving weft thread (2) is vornehmbar.

5. Weaving machine according to at least one of the preceding claims, characterized in that the measuring device (40) on the entry side of the weft thread (2) is arranged.

6. loom according to at least one of the preceding claims, characterized in that the evaluation device (45) is formed, the minimum width and / or the maximum width of a measured

Weft yarn (2) to calculate.

7. weaving machine according to at least one of the preceding claims, characterized in that the evaluation device (45) is adapted to calculate a mixed value based on a plurality of measured values of a weft thread (2) or a weft thread (2) during its entry, in particular its average width.

8. Weaving machine according to at least one of the preceding claims, characterized in that the draw-off device (30) comprises a drivable draw-off roller (32).

9. loom according to claim 8, characterized in that the

Discharge device (30) comprises a pendulum drivable deflection roller (34), which is arranged in the fabric path between the shed (3) and the driven take-off roller (32)

10. Weaving machine according to at least one of the preceding claims, characterized in that the withdrawal device (30) has a tissue clamp (36) and that the withdrawal device (30) is controllable by the control device (50) such that the tissue (4) together with the tissue clamp (36) by a predetermined,

preferably determined on the basis of the evaluated measurement results,

Distance (38) is moved back against the weaving direction, preferably up to butt with the previously entered weft thread (2).

1 1. Weaving machine according to at least one of the preceding claims, characterized in that by controlling the withdrawal device (30) the fabric (4) before the next weft insertion is placeable in such a way that the weft thread (2) can be entered in one of the following ways:

- Over its entire shot length without any gap formation with the tissue trailing edge (5), or

- over its entire shot length with a distance to the

Tissue trailing edge (5), or

- Over its entire length of shot to form one or more gaps with the tissue trailing edge (5), specifically under regional concerns at the tissue trailing edge (5) and / or overlapping with the tissue trailing edge (5).

12. weaving machine according to at least one of the preceding claims, characterized in that the evaluation device (45) and / or the control unit (50) are formed, at least the further weft insertion and the deduction device (30) in case of over- and / or undershooting

stop predetermined weft widths and / or output a predetermined signal.

13. weaving machine according to at least one of the preceding claims, characterized in that the evaluation device (45) is formed,

Error of the weft thread to be entered (2), for example, holes and / or splices, to recognize and trigger a predetermined action of the loom.