EP2230341A1 - Storage device and method for storing weft threads in a loom - Google Patents

Abstract

The method involves drawing a weft thread (2) from a supply spool and blowing the weft thread via a nozzle (21) in an input side of a storage chamber (24). The weft thread is held by a thread brake (19) in an output side of the chamber. The brake is opened for inserting the weft thread. The thread is withdrawn from the chamber via another nozzle (22) in the output side. The withdrawn thread is stretched via a third nozzle (23) in a blowing direction or reversely blown into the chamber. The blowing direction is set opposite to the latter nozzle. An independent claim is also included for a storage device for storing a weft thread in a loom.

Description

The invention relates to a method and a storage device for storing weft threads in a loom according to the preamble of claim 1 or preamble of claim 7 and a weaving machine with one or more such storage devices or equipped for carrying out such a method.

Conventional weaving machines usually include a yarn store to provide a weft, a shed forming device to form a shed, a weft insertion device to insert the weft into the shed, and a reed to abut the inserted weft to a fabric edge. The entry of the weft thread is either non-positively, for example by means of compressed air or positively, for example by means of grippers or projectiles. For example, the weft insertion device may include nozzles to accelerate the weft yarn by means of compressed air or other fluid, or grippers of guided or unguided design into which the weft thread can be clamped or projectiles to which the weft yarn can be attached to the same Enter shed.

For years, work has been going on to speed up weft insertion and thus increase the productivity of weaving machines. Depending on the machine width and weft insertion frequency, maximum yarn speeds of 60 m / s to 100 m / s are achieved on modern weaving machines. The thread acceleration takes place within approx. 10 ms. from that this results in accelerations of 0.6 10 ⁴ m / s ² to 1.0 10 ⁴ m / s ² . In addition to the acceleration and the braking of the weft yarn is power limiting. The yarn speed drops slightly over the picking time, for example due to friction, increasing yarn mass and other influences, and at the end of the weft insertion, for example by means of a mechanical stop, is lowered practically to zero momentarily. The resulting yarn tensile force peak can exceed the thread breaking force, so that there may be weft yarn breaks. An improvement is being made by the currently used ABS braking systems, which can reduce the yarn tensile force peaks by around 50%.

The previous considerations assume that the weft insertion takes place almost reproducibly. In practice, however, it is found that the total weft insertion depending on weft material and machine settings has stochastic components, for example, in the Fadenankunftszeit a clear tolerance range can be observed. This makes machine-side control and control functions required, which can be performed, for example, on a jet loom as time- and / or pressure-controlled main and relay nozzles to stabilize the weft insertion process and as far as possible to reproducible.

Thread storage plays an important role in a low-stand weaving machine operation. The weft yarn is withdrawn on conventional weaving machines periodically according to the weft insertion frequency of a supply spool and stored on a drum memory and retained by a stop element. After the release of the weft thread by the stop element of the buffered weft yarn is for example by means of non-positive yarn transport, ie registered for example by means of acceleration and relay nozzles in a shed and practically stopped momentarily at the end of the weft insertion by means of Stoppelements.

For a modern weaving machine, the following requirements apply to the thread storage device: The maximum thread withdrawal speed from the supply spool is 20 m / s - 22 m / s for spun yarns and 25 m / s for filament yarns. Caching is therefore imperative, since the ratio between the take-off speed of the pre-bobbin and the maximum yarn speeds at entry is 1: 3 to 1: 4 and a direct, positive yarn transport from the supply bobbin via a delivery mechanism is therefore excluded. Furthermore, the average yarn tension during weft insertion should be ≤15% of the mean thread breaking force and thread tensile force peaks should be limited to 50% of the mean thread breaking force, since higher yarn tensile force peaks lead to processing problems. These requirements can be met with a conventional drum store with stop element only if the drum memory modified and / or if additional components, such as an ABS brake are provided.

Out EP 0 316 028 A An apparatus and a method for providing weft yarn in weaving machines is known. The device described here includes a double roller for drawing the weft from a supply spool and a storage tube provided with a nozzle on the input side for injecting the withdrawn weft thread into the storage tube and the output side with a thread clamp for clamping the weft thread. Between storage tube and shed also a main nozzle is provided to remove the stored weft thread from the storage tube and to accelerate in the weft direction. The stored amount of thread in the storage tube is sized so that the stored amount of thread is used up towards the end of the weft insertion, and the weft thread is deducted in the last phase directly from the double role. Thus, the weft thread can be braked by appropriate control of the double role. Disadvantageous in the EP 0 316 028 A described device is that a thread tensile force peak occurs when the stored in the storage tube weft yarn is used up and the weft thread is withdrawn directly from the double roll. In addition, the device described lacks means for retracting a weft thread in the event of a weft defect from the shed.

The object of the invention is to provide a method and a storage device for storing weft threads in a weaving machine and a weaving machine with one or more such storage devices or equipped for carrying out such a method available for maximum yarn insertion speeds of 60 m / s to 100 m / s and with which registered weft threads can be withdrawn from the shed and stored again.

This object is achieved according to the invention by the method defined in claim 1 and the device defined in claim 7 and by the weaving machine defined in claim 14.

In the method according to the invention for storing weft threads in a weaving machine, a weft thread is blown from the input side by means of a first nozzle into a storage chamber which has an inlet side and an outlet side and is held on the outlet side by means of a thread brake. For the weft insertion, the yarn brake is opened and the weft thread of the storage chamber on the output side removed by means of a second nozzle. The method is characterized in that the removed weft thread is tautened by means of a third nozzle with respect to the second nozzle opposite blowing direction or blown back into the storage chamber. The weft thread can be tightened, for example, before striking, while the blowing back of the weft thread can be used in the storage chamber, for example, to eliminate weft defects.

Advantageously, the weft thread is withdrawn from a supply spool by means of a delivery device, for example a continuously operating delivery device, and fed to the first nozzle. Furthermore, the removed weft thread can be withdrawn from the shed by means of a controlled roller pair and fed to the third nozzle.

In an advantageous embodiment, the removed weft thread is accelerated by means of one or more acceleration nozzles, which are arranged in the weft direction after the second nozzle. In a further advantageous embodiment, the weft thread towards the end of Weft insertion braked by means of the thread brake with controlled braking force.

In an advantageous embodiment of the method, the delivery device and / or the blowing of the weft thread into the storage chamber and / or the removal of the weft thread from the storage chamber and / or the weft insertion and / or the blowing back of the removed weft thread due to the measured data recorded by a thread sensor which can be arranged, for example, on a mixing tube of the second nozzle or on a mixing tube of an acceleration nozzle, and by means of which, for example, the speed and / or length of the weft thread can be detected during removal or back-blowing.

In a further advantageous embodiment, two or more storage devices are each provided for a weft color, wherein in successive weft entries with the same weft color of the weft yarn is taken alternately or cyclically one of the provided for this weft color memory devices.

In a further advantageous embodiment, when a weft defect has been detected, a registered weft thread is withdrawn from the shed and blown back into the storage chamber by means of the third nozzle, or the length of a weft thread is detected by means of a thread sensor, and in the event that detects a weft defect has been, the retraction of the weft thread from the shed by means of a controlled pair of rollers, which is docked to the weft for this purpose, and which is controlled due to the detected length of the weft, wherein the withdrawn weft yarn is blown back into the storage chamber by means of the third nozzle ,

The storage device according to the invention for storing weft threads in a weaving machine comprises a storage chamber with an inlet side and an outlet side, and on the inlet side of the storage chamber a first nozzle for blowing in a weft thread and on the outlet side Storage chamber a yarn brake for holding and / or braking the weft thread and a second nozzle for removing the weft thread from the storage chamber. The yarn brake may be formed as a yarn brake with controlled braking force, for example, as a piezoelectric yarn brake to selectively hold the weft or brake with controlled braking force. The inventive storage device additionally includes a third nozzle with respect to the second nozzle opposite blowing direction to tighten the withdrawn weft thread or blow back in the event of a shot error in the storage chamber.

Advantageously, the storage chamber has a round or rounded or polygonal cross-section in the interior. Further, the storage chamber may be elongated and contain one, two or more storage sections longitudinally to receive the injected and / or blown weft yarn, and the storage chamber may be internally over at least a portion of the length, for example over more than half the length, have a constant or tapered cross-section.

In an advantageous embodiment variant, the second and third nozzles contain a double injector in order to control the running direction of the weft thread between removal on the one hand and tightening and back-blowing on the other hand. In a further advantageous embodiment, the storage device additionally comprises one or more acceleration nozzles which are arranged in the weft direction after the second nozzle and which each contain a mixing tube to accelerate the removed weft thread, and / or or the second nozzle includes a mixing tube to the to accelerate removed weft thread.

In an advantageous embodiment, the storage device additionally comprises a thread sensor, which is arranged, for example, inside or outside on a mixing tube of the second nozzle and / or one of the accelerating nozzles in order to detect the speed and / or length of the weft thread during removal or back-blowing.

In a further advantageous embodiment, the storage device optionally comprises a delivery device, for example a continuously operating delivery device and / or a delivery device with a delivery wheel for withdrawing the weft thread from a supply spool and feeding it to the first nozzle, and / or a controlled yarn retraction roller pair a shed, wherein the pair of rollers between the shed and the second nozzle of the storage device is arranged.

The invention further encompasses an arrangement with a plurality of storage devices according to one or more of the embodiments and variants described above, in which a weft thread can be taken alternately or under pattern control, wherein the arrangement contains at least one unit with two or more storage devices arranged side by side or one above the other wherein in the case of several units, they are arranged one above the other and / or next to each other. If necessary, the storage devices of a unit can form an acute angle with each other.

In addition, the invention includes a weaving machine with one or more storage devices for storing wefts according to one or more of the embodiments and variants described above and / or with at least one arrangement of description above and / or equipped for carrying out a method according to one or more of above-described embodiments and variants. The weaving machine can be designed, for example, as a jet loom, for example as an air jet loom, and / or as a rapier weaving machine and / or as a projectile weaving machine.

In an advantageous embodiment of the weaving machine, the one or more storage devices for storing weft threads and / or the at least one arrangement are arranged on a sley. In a further advantageous embodiment variant, the one or more storage devices for storing weft threads and / or the at least one arrangement are arranged stationary on the weaving machine and at least one acceleration nozzle on a sley.

The method and the storage device according to the present invention and the weaving machine according to the invention have the advantage that the yarn speed at which the weft thread is withdrawn from the supply spool is up to four times less than the maximum yarn speed during the weft insertion, and that the weft yarn in low-mass loops can be stored in the storage chamber, so that the force acting on the weft yarn when removing it from the storage chamber yarn tension is comparatively low. An additional advantage is that even withdrawn weft threads can be stored in the storage chamber. The method and the storage device according to the present invention are therefore also suitable for eliminating weft defects and in particular for automatic weft breakage repair. It is also advantageous that, if necessary, the yarn brake arranged on the output side of the storage chamber can be used for braking with controlled braking force in order to reduce yarn tensile force peaks that may arise towards the end of the weft insertion when the weft yarn stored in the storage chamber is used up and the weft yarn is stretched becomes.

The above description of embodiments and variants is merely an example. Further advantageous embodiments will become apparent from the dependent claims and the drawings. In addition, in the context of the present invention, individual features of the described or shown embodiments and variants can be combined with each other to form new embodiments.

Fig. 1

ein Ausführungsbeispiel einer Düsenwebmaschine mit einer Speichervorrichtung gemäss vorliegender Erfindung,

Fig. 2

ein zweites Ausführungsbeispiel einer Düsenwebmaschine mit einer Speichervorrichtung gemäss vorliegender Erfindung,

Fig. 3

ein Ausführungsbeispiel einer Speichervorrichtung gemäss vorliegender Erfindung,

Fig. 4A,

B eine Ausführungsform einer Anordnung mit zwei Speichervorrichtungen gemäss vorliegender Erfindung, von der Seite und von oben gesehen,

Fig. 4C

eine Ausführungsvariante zur Anordnung gemäss Fig. 4A, B mit wahlweise zwei oder vier Speichervorrichtungen, von der Seite gesehen,

Fig. 5A, B

eine zweite Ausführungsform einer Anordnung mit zwei Speichervorrichtungen gemäss vorliegender Erfindung, von der Seite und von oben gesehen,

Fig. 5C

eine Ausführungsvariante zur Anordnung gemäss Fig. 5A, B mit wahlweise zwei oder vier Speichervorrichtungen, von der Seite gesehen,

Fig. 5D

eine weitere Ausführungsvariante zur Anordnung gemäss Fig. 5A, B mit wahlweise drei oder sechs Speichervorrichtungen, von der Seite gesehen,

Fig. 6, 6A,B

ein Ausführungsbeispiel eines Fadensensors für eine Speichervorrichtung gemäss vorliegender Erfindung,

Fig. 7A,

B eine Ausführungsvariante einer Elektrodenanordnung aus dem Ausführungsbeispiel eines Fadensensors gemäss Fig. 6, 6A,

Fig. 8A-D

Diagramme mit Fadengeschwindigkeit, Weg, Fadenzugkraft und Bremsöffnung zu einem Ausführungsbeispiel, in dem das erfindungsgemässe Verfahren eingesetzt wird,

Fig. 9A, B

Diagramme der Fadengeschwindigkeit und Fachbewegung zu einem zweiten Ausführungsbeispiel, in dem das erfindungsgemässe Verfahren eingesetzt wird, und

Fig. 10A-C

ein weiteres Ausführungsbeispiel einer Speichervorrichtung gemäss vorliegender Erfindung beim Rückzug eines eingetragen Schussfadens aus einem Webfach.

In the following the invention will be explained in more detail with reference to the embodiments and with reference to the drawing. Show it:

Fig. 1

An embodiment of a jet loom with a storage device according to the present invention,

Fig. 2

A second embodiment of a jet loom with a storage device according to the present invention,

Fig. 3

an embodiment of a memory device according to the present invention,

Fig. 4A,

B shows an embodiment of an arrangement with two storage devices according to the present invention, seen from the side and from above,

Fig. 4C

a variant of the arrangement according to Fig. 4A , B with either two or four memory devices, seen from the side,

Fig. 5A, B

a second embodiment of an arrangement with two storage devices according to the present invention, seen from the side and from above,

Fig. 5C

a variant of the arrangement according to Fig. 5A , B with either two or four memory devices, seen from the side,

Fig. 5D

a further embodiment of the arrangement according to Fig. 5A , B with either three or six memory devices, seen from the side,

Fig. 6, 6A, B

An embodiment of a yarn sensor for a memory device according to the present invention,

7A,

B is a variant of an electrode arrangement of the embodiment of a yarn sensor according to Fig. 6, 6A .

Fig. 8A-D

Diagrams with yarn speed, path, yarn tension and brake opening to an embodiment in which the inventive method is used,

Fig. 9A, B

Diagrams of the yarn speed and compartment movement to a second embodiment, in which the inventive method is used, and

Fig. 10A-C

a further embodiment of a storage device according to the present invention in the withdrawal of a recorded weft thread from a shed.

Fig. 1 shows an embodiment of a jet loom 1 with at least one storage device 20 according to the present invention. The jet loom, for example, be designed as an air jet loom. However, the application of the invention is not limited to jet looms, but can be used in an advantageous manner on other types of weaving machines such as series sheds, rapier or projectile looms.

The storage device 20 according to the present invention for storing weft yarns 2, 2 'comprises a storage chamber with an input side and an output side, and on the input side of the storage chamber a first nozzle 21 for blowing a weft yarn 2 and the output side of the storage chamber in Fig. 1 non-visible thread brake for holding and / or braking the weft thread and a second nozzle 22 for removing the injected weft thread 2 'from the storage chamber. The inventive storage device additionally includes a third, in Fig. 1 invisible nozzle with respect to the second nozzle opposite blowing direction to tighten the withdrawn weft thread or blow back in the event of a shot error in the storage chamber.

In an advantageous embodiment variant, the storage device additionally comprises one or more acceleration nozzles 4, which are arranged in the weft direction after the second nozzle 22 and each containing a mixing tube to accelerate the removed weft thread, and / or the second nozzle includes a mixing tube to the to accelerate removed weft thread.

In an advantageous embodiment, the storage device 20 comprises a delivery device 3, which may, for example, include a delivery wheel for withdrawing the weft yarn 2 from a supply spool 2a and feeding it to the first nozzle 21. In a further advantageous embodiment, the storage device comprises a controlled pair of rollers 9 for the yarn withdrawal from a shed, wherein the pair of rollers between the shed and the second nozzle 22 of the storage device is arranged.

The jet loom 1 of the embodiment may be equipped with one or more of the following components, for example, with a supply spool 2a; a thread centering 2b for centering the weft yarn after the supply spool; a plurality of relay nozzles 5.1ac, 5.na-c for conveying the weft yarn 2 'during weft insertion, and control valves 12, 13, 14, 15.1, 15.n for supplying fluid to the first, second and third nozzles of the storage device, to control the accelerating nozzle 4 and the relay nozzles; the same being designed as single relay nozzles, each with a control valve or, as in Fig. 1 shown, may be summarized in groups of two or more Stafettendüsen, each of which is acted upon by a control valve together with fluid; a catching or stretching nozzle 6 for receiving and holding the weft yarn after weft insertion; a reed 8 for striking the inserted weft threads; a sley 18, on which the reed 8 and occasionally the accelerating nozzle 4 is fixed, and which are usually made pivotally, so that by means of the batten a stop movement can be performed; a pressure supply 11; a pressure distributor 11a; a firing guard 17 at the firing end of the reed to detect the arrival of the weft tip; and a control unit 10, to which, if necessary, the delivery device 3, the control valves 12, 13, 14, 15.1, 15.n and occasionally the roller pair 9 and / or the weft thread guard 17 are connected.

In the in Fig. 1 In the embodiment shown, the one or more storage devices 20 for storing weft threads or, depending on the application, optionally an arrangement of storage devices are arranged stationarily on the weaving machine 1. Advantageously, at least one accelerating nozzle 4 is additionally arranged on a sley 18.

The distance ℓ between the delivery device 3 and the first nozzle 21 of the storage device can be chosen comparatively short in this case, for example about 10 cm or 15 cm, since the storage device 20 is not moved relative to the supply spool 2a.

Fig. 2 shows a second embodiment of a jet loom 1 with one or more storage devices 20 according to the present invention. In the Fig. 2 loom 1 shown here has substantially the same components and the same structure as the weaving machine of the first embodiment described above with the exception of the one or more storage device 20, which are arranged in the second embodiment on a sley 18, that are moved when striking a registered weft. Depending on the application, an arrangement of storage devices on the sley 18 can be arranged. A repetition of the optional components of the loom 1 and the storage device 20 will be omitted below, as they have already been mentioned in the context of the first embodiment described above.

If the storage device 20 in each case comprises a delivery device 3, the delivery device is expediently arranged in a stationary manner on the weaving machine in front of the first nozzle 21 of the storage device. The distance ℓ between the delivery device 3 and the first nozzle 21 of the storage device, which is typically 20 cm or more in the second exemplary embodiment, is advantageously chosen so large that the weft thread does not come under tension during the stop movement of the sley 18.

In the case of moving storage devices, an additional acceleration nozzle is usually dispensed with, so that the weft thread 2 'removed from the storage device is accelerated in the second embodiment alone with the second nozzle 22 of the storage device. In addition, in the case of moving storage devices, a pair of rollers for the yarn withdrawal from a shed is usually dispensed with. In this case, a registered weft yarn alone with the third nozzle of the storage device is withdrawn from the shed.

Fig. 3 shows an embodiment of a storage device 20 according to the present invention for storing weft threads in a loom. In the embodiment, the storage device comprises a storage chamber 24 having an input side and an output side, and on the input side of the storage chamber, a first nozzle 21 for blowing a weft yarn 2 and the output side of the storage chamber, a yarn brake 19 for holding and / or braking the weft yarn and a second nozzle 22 for removal of the blown weft thread 2 'from the storage chamber. The yarn brake may be formed as a yarn brake with controlled braking force, for example, as a piezoelectric yarn brake to selectively hold the weft or brake with controlled braking force. The inventive storage device 20 additionally includes a third nozzle 23 with respect to the second nozzle opposite blowing direction to tighten the withdrawn weft thread or blow back in the event of a shot error in the storage chamber 24.

Advantageously, the storage chamber 24 is provided with pressure equalization orifices 25 to reduce the pressure inside the storage chamber so that the weft yarn can be injected and to create a flow which conveys the blown weft yarn 2 'towards the exit. Typically, this increases the number of pressure equalization holes per unit area toward the outlet.

Advantageously, the storage chamber 24 has a round or rounded or polygonal cross-section inside. For example, the interior may be cylindrically shaped and / or the storage chamber may be formed as a tube. Further, the storage chamber may be elongated and contain one, two or more storage sections in the longitudinal direction to receive the injected and / or blown weft. In addition, the storage chamber may have a constant or tapering cross-section in the interior over at least part of the length, for example more than half the length.

In an advantageous embodiment variant, the second and third nozzles 22, 23 contain a double injector, ie in each case an injector in a common nozzle body or in each case an injector in a nozzle body, wherein the two nozzle bodies are fastened together to control the direction of the weft thread between removal on the one hand and tightening and back blowing on the other hand. In a further advantageous embodiment variant, the second nozzle 22 contains a mixing tube 22a in order to accelerate the removed weft thread.

The yarn brake 19 may, for example, be arranged between the second nozzle 22 and the third nozzle 23. If the second and third nozzles contain a double injector, the thread brake is advantageous, as in Fig. 3 shown positioned between the nozzles in the common nozzle block. In the case of separate nozzles, for example, it is also possible to fasten the second nozzle 22, the thread brake 19 and the third nozzle 23 to one another and / or to a common carrier.

In a further advantageous embodiment, the storage device 20 additionally comprises a delivery device 3, for example a delivery device with a delivery wheel, for withdrawing the weft thread from a supply spool and feeding it to the first nozzle. Advantageously, a continuously operating delivery device is provided. However, it is also possible to intermittently operate the delivery device when needed, for example, when adjusting the length of the weft to be inserted, or when correcting a weft failure or changing the engine speed. The delivery wheel may, for example, have a constant diameter and, if a plurality of turns are provided, is advantageously designed so that the applied turns separate on their own. Suitable delivery devices are, for example, from the documents EP 445489 A1 and EP 685585 A known.

The FIGS. 4A and 4B show an embodiment of an arrangement with two storage devices 20a, 20b according to the present invention, seen from the side and from above. The storage devices can be taken alternately or pattern controlled a weft. In the embodiment shown, the two or more cases more storage devices 20a, 20b form a unit, wherein the storage devices are expediently arranged next to one another at an acute angle. In an advantageous embodiment The storage devices 20a, 20b on the input side each additionally comprise a delivery device 3a, 3b. In the FIGS. 4A and 4B In addition, a section of a reed 8 is shown next to the storage devices to indicate that the storage devices are arranged on a sley, apart from the delivery devices together with the reed, while the delivery devices 3a, 3b are advantageously stationary on the weaving machine are arranged.

Fig. 4C shows a variant of the arrangement according to Fig. 4A , B with either two or four or more memory devices, seen from the side. In this embodiment, two or more cases more storage devices 20.1a, 20.2a are arranged one above the other, wherein the storage devices expediently form an acute angle to each other. In the same way, however, two or more occasionally more in the FIGS. 4A and 4B shown units, each containing two or more juxtaposed storage devices, are stacked to form an array with at least four storage units. In an advantageous embodiment, the storage devices on the input side each additionally comprise a delivery device 3.1a, 3.2a. In Fig. 4C Furthermore, a section of a reed 8 is shown next to the storage devices to indicate that the storage devices are arranged on a sley, apart from the delivery devices together with the reed, while the delivery devices are advantageously arranged stationarily on the weaving machine.

The arrangements and / or units described above are advantageously designed as prefabricated units.

The FIGS. 5A and 5B show a second embodiment of an arrangement with two or more storage devices according to the present invention, seen from the side and from above. The storage devices can be taken alternately or pattern controlled a weft. In the embodiment shown, the two or more storage devices 20a, 20b form a unit, wherein the Storage devices are conveniently arranged side by side. In an advantageous embodiment variant, the storage devices 20a, 20b on the input side each additionally comprise a delivery device 3a, 3b and / or on the output side and spaced from the remaining storage device respectively an acceleration nozzle 4a, 4b, wherein the acceleration nozzles are expediently arranged at an acute angle to each other. In the FIGS. 5A and 5B Furthermore, a section of a reed 8 is shown next to the accelerating nozzles, to indicate that in the arrangement shown the accelerating nozzles are arranged together with the reed on a sley, while the storage devices together with the delivery devices 3a, 3b are advantageously fixed on the loom are arranged.

Fig. 5C shows a variant of the arrangement according to Fig. 5A , B with either two or four memory devices, seen from the side. In this embodiment, two memory devices 20.1a, 20.2a are arranged one above the other. In the same way, however, two of the in the FIGS. 5A and 5B shown units, each containing two or more juxtaposed storage devices, are stacked to form an array with at least four storage units. Advantageously, the storage devices additionally comprise on the input side in each case a delivery device 3.1a, 3.2a and / or on the output side and spaced from the remaining storage device in each case an acceleration nozzle 4.1a, 4.2a, wherein the acceleration nozzles form an acute angle expediently. In the Fig. 5C Furthermore, a section of a reed 8 is shown following the accelerating nozzles to indicate that in the arrangement shown, the accelerating nozzles are arranged together with the reed on a sley, while the storage devices are advantageously arranged fixedly on the weaving machine together with the delivery devices.

Fig. 5D shows a further embodiment of the arrangement according to Fig. 5A , B with either three or six or more memory devices, seen from the side. The memory devices can alternately or pattern-controlled a weft thread can be removed. In this embodiment, three or more storage devices 20.1a, 20.2a 20.3a are arranged one above the other. In the same way, however, three or more of the in the FIGS. 5A and 5B shown units, each containing two or more juxtaposed storage devices are stacked to form a six-unit storage arrangement. Advantageously, the storage devices comprise on the input side additionally each a delivery device 3.1 a, 3.2a, 3.3a and / or output side and spaced from the rest of the storage device in each case an accelerating 4.1 a, 4.2a, 4.3a wherein the acceleration nozzles form an acute angle expediently. In the Fig. 5C Furthermore, a section of a reed 8 is shown following the accelerating nozzles to indicate that in the arrangement shown, the accelerating nozzles are arranged together with the reed on a sley, while the storage devices are advantageously arranged fixedly on the weaving machine together with the delivery devices.

The arrangements and / or units described above are advantageously designed as prefabricated units.

In an advantageous embodiment, the storage device 20, 20a, 20b, 20.1a-20.3a according to the present invention additionally comprises a yarn sensor, for example on a mixing tube 22a of the second nozzle 22 and / or an accelerating nozzle 4, 4a, 4b, 4.1a-4.3 a may be arranged to detect the speed and / or length of the weft during removal or rebound. The Figures 6, 6A and 6B show an embodiment of such a thread sensor. Fig. 6 shows a longitudinal section through the thread sensor and Fig. 6A a cross section.

The yarn sensor 16 is formed in the embodiment as an electrostatic sensor to detect one or more motion variables of the weft during the weft insertion. Preferably, the detection takes place without contact. The thread sensor for this purpose comprises a tubular support 16c, which at the same time as mixing tube if necessary can be used and a grid with periodically arranged in the thread running direction grid elements, which are effective as electrodes 16a, 16b. The carrier may consist of an insulating tube, for example an insulating ceramic or plastic tube, and the electrodes may be formed on the carrier inside or outside. However, the carrier can also consist of a metal tube and the electrodes can be applied to the interior of the tube on an insulating intermediate layer.

Advantageously, the electrodes 16a, 16b are cylindrically shaped, but it is also possible to use other forms of electrodes, for example planar electrode forms, inside or outside the mixing tube. Fig. 6B shows a possible embodiment of the electrodes 16a, 16b in a schematic side view. The thread sensor shown comprises two electrodes with periodically and comb-like arranged grid elements, wherein in the direction of weft thread alternately a grid element of a conductor follows a grid element of the other conductor. The individual grid elements of an electrode are connected to each other via a conductor which, for example, as in Fig. 6B shown, can run in the direction of the weft.

A variant of an electrode assembly according to the embodiment according to Fig. 6, 6A , is in Fig. 7A, B shown, where Fig. 7A shows a cross section through the electrode assembly and Fig. 7B a simplified view in which the electrodes have been rolled out in a plane for ease of illustration. The thread sensor contains in the in the FIGS. 7A and 7B shown embodiment, two electrodes 16a, 16b with periodically and double comb-like arranged grid elements, wherein the grid elements mesh and alternately follows in the running direction of the weft thread a grid elements of a conductor on a grid element of the other conductor. The individual grid elements of an electrode are each connected to one another via a conductor which, for example, the grid element, as in Fig. 7B shown, connects in the middle and can run in the direction of the weft.

The basic mode of operation of an electrostatic sensor, which is based on the principle of the so-called spatial filter method, is out document EP 1 033 579 A2 known. The thread sensor described above can be operated, for example, as follows: If a weft thread is in the region of the grid elements, the charges present in the grid elements on the weft thread generate a periodic signal component which can be electronically amplified and whose frequency can be detected. The detected frequency is proportional to the speed of the weft. The transducer is thus able to detect not only the presence but also the current speed of a weft.

The thread sensor described above with the described embodiments and in particular its design on a mixing tube of an acceleration nozzle can be regarded as an independent object that can be protected in a separate application.

The inventive method is described below with reference to the FIGS. 1 to 5 D explained in more detail. In the method for storing wefts in a loom, a weft yarn 2 is blown from the input side by means of a first nozzle 21 into a storage chamber 24 having an input side and an output side and held on the output side of the storage chamber by means of a yarn brake 19. For the weft insertion, the thread brake 19 is opened and the weft thread 2 'of the storage chamber on the output side removed by means of a second nozzle 22. The method is characterized in that the removed weft thread is tautened by means of a third nozzle 23 with respect to the second nozzle opposite blowing direction or blown back into the storage chamber. The weft thread can be tightened, for example, before striking, while the blowing back of the weft thread can be used in the storage chamber, for example, to eliminate weft defects.

Advantageously, the weft thread is drawn off from a supply spool 2a by means of a delivery device 3, 3a, 3b, 3.1a-3.3a, for example by means of a continuously operating delivery device, and fed to the first nozzle 21. Next, the removed weft thread by means of a controlled roller pair 9 withdrawn from the shed and the third nozzle 23 are supplied.

In an advantageous embodiment, the removed weft thread is accelerated by means of one or more acceleration nozzles 4, 4a, 4b, 4.1a -4.3 a, which are arranged in the weft direction after the second nozzle 22. In a further advantageous embodiment, the weft thread is braked against the end of the weft insertion by means of the thread brake 19 with controlled braking force.

In an advantageous embodiment of the method, the delivery device 3, 3a, 3b, 3.1a - 3.3a and / or the blowing of the weft thread into the storage chamber 24 and / or the removal of the weft thread from the storage chamber and / or the weft insertion and / or Back blowing the removed weft yarn is controlled on the basis of the measured by a yarn sensor 16 measurement data, which may for example be arranged on a mixing tube 22a of the second nozzle 22 or on a mixing tube of an accelerating nozzle 4, 4a, 4b, 4.1a -4.3 a, and means which, for example, the speed and / or length of the weft thread can be detected during removal or back-blowing.

In a further advantageous embodiment, in each case two or more storage devices 20 are provided for a weft color, wherein in successive weft entries with the same weft color of the weft yarn is taken alternately or cyclically one of the provided for this weft color memory devices. The term weft color, as is customary in the textile machine sector, encompasses all yarn properties, such as, for example, color, diameter, texture, roughness and other specific yarn properties.

In a further advantageous embodiment, when a weft error has been detected, a registered weft thread is withdrawn from the shed and blown back into the storage chamber 24 by means of the third nozzle 23, or the length of a registered weft thread is detected by a yarn sensor 16, and in the event that a weft error has been detected, the retraction of the weft thread from the shed by means of a controlled roller pair 9, which is docked to the weft for this purpose, and controlled on the basis of the detected length of the weft is, wherein the retracted weft thread is blown back into the storage chamber 24 by means of the third nozzle.

The use of the inventive method during weft insertion is described below with reference to an embodiment and to the hand of FIGS. 1 to 3 and 8A to 8D explained in more detail. In the exemplary embodiment, the weft thread 2 before the weft insertion by a delivery device 3, provided and by means of a first nozzle 21 in a storage chamber 24 having an input side and an output side, blown from the input side and the output side of the storage chamber by means of a yarn brake 19, wherein the first nozzle advantageously operates in the low pressure range. The blown weft thread 2 'can be stored, for example in loop form in the storage chamber 24. For the weft insertion, the thread brake 19 is opened and the weft thread 2 'of the storage chamber on the output side removed by means of a second nozzle 22. The weft thread can then be entered in a known manner by means of an accelerating nozzle 4 and additional relay nozzles 5.1ac to 5.na-c in a shed. By closing the thread brake 19, the weft insertion is completed and the next storage process begins. Typically, the thread delivery is interrupted by the delivery device at any time. The emptying time of the storage chamber 24 is usually proportional to the pressure with which the second nozzle 22 and the accelerating nozzle 4 are acted upon.

At the start of firing, the weft thread 2 'deposited in the storage chamber 24 is positively removed through the second nozzle 22, the acceleration nozzle 4 and the relay nozzles 5.1ac to 5.na-c. The weft yarn 2 'deposited in the storage chamber 24 has a yarn length which is smaller than the total yarn length required for the weft insertion. The remaining thread length to the required total thread length is supplied by the delivery device 3 in a form-fitting manner. If the deposited in the storage chamber weft thread 2 'has been removed, occurs due to the transition from force-locking on the form-fitting thread transport on a thread tensile force peak. This can be reduced by slowing down the weft thread before the weft yarn 2 'deposited in the storage chamber has been used up, for example by means of a yarn brake 19 with controlled braking force.

In order to keep the thread load low, two or more storage devices are used and the weft yarn is taken alternately or cyclically from one of the storage devices. This results in a moderate constant speed of the delivery device. Advantageously, during the weft insertion with a yarn sensor 16 arranged on a mixing pipe 22a of the second nozzle 22 or the accelerating nozzle, the speed and / or length of the weft yarn is detected and the delivery device 3 on the one hand and the braking force of the yarn brake on the other hand are controlled with the detected values.

Fig. 8A shows a diagram of the yarn speed v as a function of the machine angle during the weft insertion. The machine angle is proportional to time at constant speed. After the shot start IB the weft thread is accelerated up to the maximum thread speed. The thread speed then decreases slightly due to friction and the increasing thread length and drops relatively steeply toward zero towards the end of the weft insertion, thus reaching the end IE of the weft insertion. The steepness of the speed drop is determined on the one hand by the braking force of the yarn brake 19 and on the other hand by the delivery speed of the delivery device. 3

Fig. 8B shows a diagram of the distance traveled by the weft thread tip L in function of the machine angle and Fig. 8C a diagram of the thread tension F as a function of the machine angle. The thread tensile force peak towards the end of the weft insertion is formed by the transition from non-positive to the positive thread transport when the stored in the storage tube weft supply is used up and the weft is supplied directly from the delivery device. Without slowing the yarn speed before the transition, the yarn tension peak would be much higher. Next you can see from the Figures 8B and 8C in that the residual thread length directly supplied by the delivery device is comparatively short compared to the total thread length required for the weft insertion, for example less than 20% or less than 10% or less than 5% of the required total thread length.

Fig. 8D shows a diagram of the opening gap s _{B of} the yarn brake 19 in function of the machine angle. The braking force of the yarn brake is dependent on the opening gap.

The use of the inventive method in weft insertion is described below with reference to a second embodiment and to the hand of FIGS. 1 to 3 and 9A and 9B. The Figures 9A and 9B show the associated diagrams of the yarn speeds v ₁ , v _L1 , v ₂ , v _L2 and bin movement H during two consecutive weft entries. In order to keep the thread load low, two or more storage devices 20 are used if necessary, and the weft thread is taken alternately from one of the storage devices.

In the second embodiment, the first weft thread 2 before the weft insertion by a delivery device 3, provided and by means of a first nozzle 21 in a storage chamber 24 having an input side and an output side, injected from the input side and the output side of the storage chamber by means of a thread brake 19 is held , wherein the first nozzle advantageously operates in the low pressure range. The blown weft thread 2 'can be stored, for example in loop form in the storage chamber 24. For the weft insertion, the thread brake 19 is opened and the weft thread 2 'of the storage chamber on the output side removed by means of a second nozzle 22. The weft thread can then be entered in a known manner by means of an accelerating nozzle 4 and additional relay nozzles 5.1a-c to 5.na-c in a shed. By closing the thread brake 19, the weft insertion is completed and the next storage process begins.

The yarn speeds v ₁ , v _{2 of} the first and second weft threads are in Fig. 9A shown in function of the machine angle. In a first Machine cycle, which goes from 0 ° to 360 °, the first weft thread is accelerated to the maximum thread speed after the shot start IB ₁ . The yarn speed v _{1 of} the first weft thread then remains at a high level and drops towards the end IE _{1 of} the weft insertion to zero. The second weft remains at rest during the first machine cycle. In the subsequent second machine cycle, which goes from 360 ° to 720 °, the first weft yarn remains at rest, during which the second weft yarn is accelerated after the shot start IB ₂ up to the maximum yarn speed. The yarn speed v _{2 of} the second weft thread subsequently remains at a high level and drops towards the end IE _{2 of} the weft insertion to zero. The course of the respective yarn speeds v ₁ , v ₂ is in Fig. 9A shown schematically. In practice, the course of the thread speeds during a weft insertion will be closer to that in Fig. 8A approximate the course shown.

The respective delivery speeds v _L1 , v _L2 , with which the first and second weft yarns are provided by the delivery devices, can, as in Fig. 9A shown to be essentially constant. But it is also possible to adjust the respective delivery speeds v _L1 , v _L2 , for example, when adjusting the weft length, in the removal of weft defects or changes in the engine speed. Further, the weft yarns may be provided intermittently by the delivery devices as needed. Since two storage devices 20 are used in this exemplary embodiment, the weft thread can be taken alternately from one of the storage devices. This means that during the weft insertion of a weft thread, the thread supply can be filled in the memory chamber belonging to the other weft yarn. This results in a moderate and, if desired, constant speed of delivery devices.

Further details and variants of the second embodiment, the in the context of FIGS. 8A to 8D be removed described first embodiment.

In an advantageous embodiment of the method according to the invention, a weft thread taken from the storage chamber 24 is tautened by means of a third nozzle 23 with a blowing direction opposite to the second nozzle 22. In the in the Figures 9A and 9B shown second embodiment, both the first and the second weft thread are conveniently tightened. However, the embodiment described in the context of this embodiment for tightening the weft thread can also be applied in a corresponding manner when successive weft threads of the same storage device or more than two storage devices are removed.

Fig. 9B shows the movement of the warp threads K ₁ and K ₂ in the second embodiment over two machine cycles, while the respective blowing times TT ₁ , TT ₂ for tightening the weft threads in Fig. 9A are drawn. At the beginning of the first machine cycle, for example, the first warp K _{1 can be} raised and the second warp K ₂ lowered to form a shed for the first weft insertion. The two warp threads K ₁ and K ₂ are representative of all warp threads of the upper or lower shed.

In the first machine cycle, the first weft yarn is accelerated to the maximum yarn speed after the shot start IB ₁ . The yarn speed v _{1 of} the first weft thread then remains at a high level and drops towards the end IE _{1 of} the first weft insertion to zero. At the end of IE _{1 of} the first weft insertion of the registered weft thread is conveniently received and held by a catch or stretching nozzle 6, which is arranged at the catch end of the shed. In some cases, in addition to or instead of the catching and stretching nozzle 6, a thread clamp can be provided at the catching end of the shed to hold the inserted weft thread. At the same time or subsequently, the respective third nozzle 23 can be subjected to pressure in order to tighten the inserted weft thread. During tightening the respective yarn brake 19 is opened with advantage.

At the end of the first weft insertion also the first warp K _{1 is} lowered and the second warp K ₂ lifted to close the shed. After closure, the thread brake 19 is normally closed and the third nozzle 23 is switched off.

In the second machine cycle, the first warp K _{1 is} lowered and the second warp K ₂ lifted to form a shed for the second weft insertion. For the description of the second weft insertion reference is made to the preceding sections. The tightening of the second weft thread takes place in the same way as the tightening of the first weft thread, for which reason reference is also made to the preceding description.

In a further advantageous embodiment of the method according to the invention, a weft thread removed from the storage chamber 24 is blown back into the storage chamber by means of a third nozzle 23 with a blowing direction opposite to the second nozzle 22. The Figures 10A-C show in this context a further embodiment of a storage device according to the present invention in the withdrawal of a recorded weft thread from a shed. The blowing back of the weft thread into the storage chamber can be used, for example, in the automatic repair of weft defects, for example, when a weft failure occurs in the shed after a weft breakage or other disturbance.

Fig. 10A shows a storage device 20 during the weft insertion. In the exemplary embodiment, the weft thread 2 before the weft insertion by a delivery device 3, provided and by means of a first nozzle 21 in a storage chamber 24 having an input side and an output side, blown from the input side and the output side of the storage chamber by means of a yarn brake 19, wherein the first nozzle advantageously operates in the low pressure range. If the storage chamber, as in Fig. 10A shown, two storage sections 24a, 24b, which are separated from each other in the longitudinal direction, for example by a cross-sectional constriction, the weft thread is advantageously stored in the first storage section 24a. The injected weft thread 2 'can for example, be stored in loop form in the storage chamber and has the length L _s immediately before the weft insertion. From the first storage section 24a or occasionally from the undivided storage chamber to a weft-side of a reed 8 arranged thread scissors of the weft thread has a substantially constant length L _k .

For the weft insertion, the thread brake 19 is opened and the weft thread 2 'of the storage chamber on the output side removed by means of a second nozzle 22. The weft thread can then be entered in a known manner by means of an accelerating nozzle 4 and additional relay nozzles in a shed. In an advantageous embodiment variant, the second nozzle 22 contains a mixing tube 22a in order to accelerate the withdrawn weft thread.

If a weft error is detected, for example because a weft detector located at the trailing end of the shed does not provide an arrival signal, the loom is stopped. When the weaving machine comes to a standstill, the nth speed change has normally already taken place, i. the not completely inserted weft thread is already integrated. To remove a not completely registered weft thread from the shed the loom is usually driven into the open compartment n-1.

Fig. 10B shows the storage device 20 during an automatic shot break repair. The delivery device 3 is stopped as soon as a weft error has been detected. One way to pull the weft thread controlled from the shed, is the docking of a controlled pair of rollers 9. The drawn by means of the pair of rollers from the shed weft thread is then blown back by means of the third nozzle 23 into the storage chamber and stored in the same. If the storage chamber comprises two storage sections 24a, 24b, the withdrawn weft thread 2 "is preferably deposited in the second storage section 24b., If no controlled pair of rolls is provided, for example with comparatively small weaving width or if the storage device is arranged together with the reed 8 on a sley is, the weft yarn can be withdrawn alone with the third nozzle 23 from the shed.

The withdrawal of the weft thread is advantageously controlled by means of a thread sensor, for example by means of a thread sensor which is arranged in the mixing tube 22a of the second nozzle 22 or in the mixing tube of an acceleration nozzle 4. Conveniently, the yarn brake 19 is closed in the storage device and / or a thread clamp in the acceleration nozzle 4, stopped the pair of rollers and stopped docking when the thread tip of the withdrawn weft thread has left the shed. The withdrawn from the shed thread length .DELTA.L _s , for example, as in Fig. 10B shown after retraction and depositing stored in the second memory section 24b of the storage device 20, while the remaining, unregistered weft thread 2 'with the length L _s - .DELTA.L _s may be stored in the first storage section. In order to avoid positive length tolerances, the withdrawn weft thread, if necessary, is separated by a thread scissors arranged at the weft-side end of the reed 8, for example by means of a control cut, which is carried out in each case. The control can be designed so that the weft thread is withdrawn only under certain conditions, for example, from a previously defined position of the weft thread tip in the shed.

Fig. 10C shows the storage device 20 after the next, ie n-th weft insertion. Advantageously, the registered weft thread with the length L _{sn is held} at the catching end of the shed or clamped and tightened by means of the third nozzle 23 to exclude thread loops on the left fabric side. At the same time, the weft length L _{sn + 1 is} adjusted for the next weft insertion, and if necessary, fault lengths are supplemented.

The method and the storage device for storing weft yarns and the weaving machine according to the present invention have the advantage that they are suitable for maximum yarn insertion speeds of 60 m / s to 100 m / s and more, as in the removal from the storage chamber acting on the weft yarn tension is comparatively low. Another advantage is that even withdrawn weft threads can be stored in the storage chamber, so that the method described above, the storage device described and the weaving machine described can also be used for automatic weft troubleshooting.

Claims (15)

Method for storing weft threads in a weaving machine, in which a weft thread (2) is blown in from the inlet side by means of a first nozzle (21) into a storage chamber (24, 24a, 24b) having an inlet side and an outlet side and the outlet side Storage chamber by means of a thread brake (19) is held, and opened for the weft insertion, the yarn brake and the weft thread of the storage chamber on the output side by a second nozzle (22), characterized in that the removed weft thread by means of a third nozzle (23) with respect to the second nozzle (22) taut opposite direction of blowing or is blown back into the storage chamber (24, 24a, 24b). The method of claim 1, wherein the weft thread (2) by means of a delivery device (3), for example by means of a continuously operating delivery device, withdrawn from a supply spool (2a) and the first nozzle (21) is supplied. Method according to claim 1 or 2, wherein the extracted weft thread is accelerated by means of one or more acceleration nozzles (4) arranged in the weft direction after the second nozzle (22), and / or wherein the weft thread is moved towards the end of the weft insertion by means of the thread brake (19 ) is braked with controlled braking force. Method according to one of the preceding claims, wherein the removal of the weft thread from the storage chamber (24, 24a, 24b) and / or the weft insertion and / or the blowing back of the removed weft thread is controlled on the basis of the measurement data acquired by a thread sensor (16), which for example, on a mixing tube (22a) of the second nozzle (22) or on a mixing tube of a Acceleration nozzle (4) is arranged, and by means of which in particular the speed and / or length of the weft thread during removal or during back-blowing are detected. Method according to one of the preceding claims, wherein in each case two or more storage devices are provided for a weft color, and wherein at successive weft entries with the same weft color of the weft yarn is taken alternately or cyclically one of the provided for this weft color storage device. Method according to one of the preceding claims, wherein in the event that a weft defect has been detected, a recorded weft thread is withdrawn from the shed and blown back into the storage chamber (24, 24a, 24b) by means of the third nozzle (23), or wherein the length of a registered weft thread by means of a yarn sensor (16) is detected, and in the event that a weft error has been detected, the withdrawal of the weft thread from the shed by means of a controlled roller pair (9), which is docked to the weft thread for this purpose, and on Reason of the detected length of the weft yarn is controlled, and the withdrawn weft yarn is blown back into the storage chamber (24, 24a, 24b) by means of the third nozzle (23). A storage device for storing weft threads in a weaving machine, wherein the storage device (20) comprises a storage chamber (24, 24a, 24b) with an input side and an output side, and on the input side of the storage chamber a first nozzle (21) for injecting a weft thread (2) and On the output side of the storage chamber a yarn brake (19), in particular a piezoelectric yarn brake, for holding and / or braking the weft thread and a second nozzle (22) for removing the weft thread from the storage chamber, characterized characterized in that the storage device (20) additionally includes a third nozzle (23) with opposite blowing direction relative to the second nozzle (22) to tighten the withdrawn weft thread or to blow back into the storage chamber (24, 24a, 24b) in the event of a weft defect , A storage device according to claim 7, wherein the storage chamber (24, 24a, 24b) has a round or rounded or polygonal cross-section inside and / or wherein the storage chamber (24) is elongate and has one, two or more storage sections (24a, 24b ) to receive the blown and / or blown back weft thread, and the storage chamber has a constant or tapered cross section in the interior over at least part of the length, in particular over more than half the length. Storage device according to one of claims 7 or 8, wherein the second and third nozzles (22, 23) comprise a double injector in order to control the running direction of the weft thread between removal on the one hand and tightening and back-blowing on the other hand. Storage device according to one of claims 7 to 9, wherein the storage device additionally comprises one or more acceleration nozzles (4) which are arranged in the weft direction after the second nozzle (22) and which each contain a mixing tube to accelerate the withdrawn weft thread, and / or wherein the second nozzle (22) includes a mixing tube (22a) for accelerating the withdrawn weft thread. Storage device according to Claim 10, additionally comprising a thread sensor (16) which is located inside or outside on a mixing tube (22a) of the second nozzle (22) and / or one of the acceleration nozzles (4). is arranged to detect the speed and / or length of the weft thread during the removal or the blow-back. Storage device according to one of claims 7 to 11, additionally comprising a delivery device (3), for example a continuously operating delivery device, to withdraw the weft thread (2) from a supply spool (2a) and feed it to the first nozzle (21) and / or a controlled one Roller pair (9) for the yarn withdrawal from a shed, wherein the roller pair between the shed and the second nozzle (22) of the storage device (20) is arranged. Arrangement with a plurality of storage devices according to one of claims 7 to 12, to remove the storage devices alternately or pattern controlled a weft thread, the arrangement comprises at least one unit with two or more juxtaposed or stacked storage devices, and wherein in the case of several units the same one above the other and / or are arranged side by side. Weaving machine (1) having one or more storage devices (20) for storing weft threads according to one of claims 7 to 12 and / or at least one arrangement according to claim 13 and / or equipped for carrying out a method according to one of claims 1 to 6. Weaving machine (1) according to claim 14, wherein the one or more storage devices (20) for storing weft threads and / or the at least one arrangement are arranged on a sley (18), or wherein the one or more storage devices (20) for storing Weft threads and / or the at least one arrangement stationary on the weaving machine and at least one Acceleration nozzle (4) on a sley (18) are arranged.

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