EP1771610B1 - Jet-weaving machine, particularly an air jet-weaving machine, with a clamping device in the mixing tube - Google Patents

Abstract

A thread clamping device is provided for a jet weaving machine that has a main discharge nozzle (1) with a mixing tube (2) for inserting a weft thread (3) into a shed with a conveying fluid discharged from the main discharge nozzle. This clamping device is placed inside the mixing tube (2) in the area from which the weft thread exits, and has an actuator, which is situated outside of the mixing tube (2), and a lever connected to the actuator so that this lever is actuated by the actuator (6) to execute a tilting or pivoting motion whereby the weft thread is clamped between the lever and an abutment (9) in an opening of the mixing tube.

Description

The invention relates to a jet loom, in particular an air jet loom, with a clamping device in the mixing tube for clamping a cut-off weft thread such that its jumping back into the mixing tube is prevented.

Jet looms, in particular air jet looms, are among the shuttleless looms. Such a shuttleless loom is out DE 32 00 638 A1 known. In this known shuttleless loom is either a thread clamp in the end of the mixing tube mounted on the sley Hauptblasdüse or in addition to another thread clamp arranged before the entry of the weft yarn in the Hauptblasdüse. The known thread clamps are formed as an elastic, fixedly inserted into the mixing tube intermediate piece, which can clamp the weft thread substantially in the middle of the mixing tube with linearly movable lifting members. In addition, clamping devices are described, which are provided by means arranged in the intermediate tube passertight, linearly movable lifting members which clamp the weft thread on an opposite wall of the flattened in cross-section of the mouth opening mixing tube. The movement of the lifting elements required to produce the clamping action of the thread clamps requires relatively long stroke paths, since these execute a linear movement.

Furthermore, are off DE 102 44 694 A1 a method for holding a weft thread in the region of a main nozzle of a jet loom and a jet loom for performing the method known. In this known jet loom, a clamping device in the form of a pneumatic muscle is described in the front region, ie, the tissue-facing outlet end of the mixing tube. The described pneumatic muscle is acted upon from the outside with compressed air, whereby the walls are pressed to the center of the mixing tube, in which area is to be clamped weft. As a result, the weft thread is clamped approximately in the region of the longitudinal axis of the mixing tube.

Furthermore, it is off DE 102 57 035 A1 a weft yarn tensioning device for a main nozzle device of an air-jet loom known. In this known A weaving machine is arranged in each case one thread clamp in front of the main nozzle device as well as after the main nozzle device in the region of the end of the mixing tube. On the one hand, the described clamping device is actuated via linearly movable actuators, for which relatively long stroke paths are required for realizing the clamping movement. On the other hand, the disadvantage of the clamping of the weft thread before the main nozzle is that the weft thread is crushed by the clamping, which does not readily dissolve after entry of the weft thread for certain materials, so that this clamping at least optically in the finished fabric is detectable. In order to avoid that such clamping marks are visible in the finished fabric, a relatively large waste, ie end to be cut off from the weft thread would have to be accepted. However, this would result in a relatively large loss of material.

Finally is off JP 2000119936 a device for holding the weft thread at the outlet of the mixing tube of a Hauptblasdüse known.
The clamping surface of an example acted upon by a spring clamping lever engages in an end provided in the mixing tube longitudinal groove and is forcibly on a likewise end of the mixing tube existing abutment effective. The weft thread is clamped between the clamping surface and the abutment.
The clamping lever is designed such that the weft thread transporting air flow of the Hauptblasdüse the clamping lever against the action of its clamping force acts and opens and at the same time releases the clamped between clamping surface and abutment weft.
An individual control of the clamping or holding device is not possible.

The invention is therefore based on the object, a jet loom, in particular an air jet loom, with a device for controlled clamping of a weft thread in a mixing tube of a main nozzle, and by means of which means short ways of the clamping member and thus a relatively small force to perform the movement of the Klemmorgans be enabled.

This object is achieved by a jet loom, in particular air jet loom, having the features according to claim 1. Advantageous developments are defined in the dependent claims.

According to the invention, the jet loom, preferably an air-jet weaving machine, has a main blowing nozzle with a mixing tube for introducing a weft thread into a shed by means of a transporting fluid ejected from the main blowing jet. Depending on the number of different colors or materials of weft threads to be interwoven, preferably up to eight main blowing nozzles with respective mixing tubes are provided in the jet loom according to the invention. The preferably arranged on the sley Hauptblasdüse with mixing tube has in the region of its weft exit to a single clamping device. This clamping device is structurally small, i. has a compact design and has an outside of the mixing tube arranged Akuator and an associated lever. The lever is connected to the actuator such that it performs a tilting movement when it is acted upon by an actuating means, which may be preferably a hydraulic, pneumatic or electrical means. With a correspondingly long lever, it can thus be ensured that, when the actuator is acted upon by the actuating means, relatively small deformations of the actuator already lead to relatively long movement paths of the end of the lever remote from the actuator. However, it is also possible that the actuation of the actuator with actuating means, in which the lever is in a non-clamping position, is interrupted, so that, when the actuation of the actuator is interrupted or omitted, the lever executes the necessary tilting movement in order to move out of the non-clamping position. Clamping position to get into its clamping position. In the area of the end of the mixing tube this is provided with an opening. The lever has such a length and shape that it clamps the weft thread when it performs its tilting movement in this opening of the mixing tube between itself and an abutment.

A significant advantage of this design of the clamping device according to the invention is that over the length and shape of the lever relatively large distances can be generated without the actuators require large, the tilting movement of the lever generating deformations. This makes it possible that the clamping device can be designed with relatively small dimensions. Especially in jet looms, which are provided with up to eight main blowing nozzles arranged with respective mixing tube in the block, the small size of the clamping device is of great importance. On the one hand, the main blowing nozzles and associated mixing tubes can be arranged in close proximity to one another in the block, on the other hand the low weight of the clamping device means that the acceleration forces occurring as a result of the movement of the sley and that due to the execution of the tilting movement occurring acceleration forces are low or less than the pneumatic forces. With the inventive design of the clamping device, it is also possible to achieve an equilibrium of forces by a corresponding mass distribution, in which the accelerations occurring have no negative impact on the clamping force or on the clamping action.

A further advantage of the jet loom according to the invention with respect to its clamping device is that the clamping of the weft thread in the mixing tube can be done near their pointing towards the tissue outlet opening, so that this clamping area belongs to registered weft thread to be cut waste, thus not only produces a low waste but also a high quality fabric in which nipples can lead to no visual impairment. In addition, in the clamping device according to the invention there is a low risk of contamination, since at least a slight overpressure exists by the blown air introduced from the main blowing in the mixing tube, so that dirt particles can not penetrate despite the opening in the mixing tube in this. Due to the small deformations of the actuator when applying or even omitting its application and their implementation in a relatively long, adapted to the intended use movements of the end portion of the lever, the stresses of the actuator are low, which leads to its high life.

According to one embodiment of the invention, the actuator is formed as an elastomer bellows, in particular rubber bellows and has at least one chamber, to which via a connection on the actuator, the actuating means can be applied with a defined pressure. To the elastomer bellows, the lever is fixed with one side, so that the deformation of the chamber, which is effected by the actuating means, causes a tilting movement of the lever. The tilting movement of the lever at its end, which is opposite to the end to which it is attached to the actuator, is at least so large that the preferably angled formed end portion of the lever dips into the opening of the mixing tube, presses against the abutment and with its end between itself and the abutment the weft thread is stuck.

Preferably, the actuator of the clamping device of the jet loom according to the invention has two chambers, of which at least one can be acted upon by the actuating means. The lever is connected in the region between the chambers, preferably on a wall separating both chambers, to the actuator, wherein the lever undergoes a tilting movement due to the deformation resulting from the loading of the chamber. However, it is also possible that both chambers are acted upon by the actuating means and - depending on whether the lever is to be transferred to the non-clamping position or in the clamping position - is acted upon by the actuating means.

Preferably, the lever is additionally attached to the mixing tube with a spring element which is mounted between the lever and the mixing tube so that it is stretched upon actuation of the actuator with the actuating means by the tilting movement of the lever in a clamping position, whereas in the absence of the actuation of the actuator with the actuating means by means of its restoring force, ie the restoring force of the spring element of the lever is moved from the clamping position to its non-clamping position. The advantage of the additional spring element is that the actuator only has to be acted upon by actuating means such that the tilting movement takes place in one direction. This means that the tilting movement takes place either in the direction of and in the non-clamping position or in the direction of and into the clamping position. The respective movement from the position to the previously assumed position is effected by the spring element. Preferably, the lever is designed so that it is longer than the distance of the actuator to the opening formed in the mixing tube and the spring element is attached to the end of the lever, which is mounted opposite to the actual clamping of the weft thread exporting end.

According to one embodiment of the invention, the lever on the actuator or attached to this or glued or vulcanized. In any case, the lever is attached to the actuator in such a way that, when acted upon by the actuating means, the lever is set in a tilting or pivoting movement, but is firmly connected to the actuator such that the movement of the sley does not lead to unintentional release or loosening the lever from the actuator leads.

Preferably, the actuation means for the actuator is the transport fluid, preferably air. The advantage of using the transport fluid itself as the actuating means is to work with only one fluid in order to bring the actuator to its deformation for performing the tilting movement of the lever.

Preferably, the actuating means is supplied under pressure or negative pressure to the actuator. However, it is also possible to work with both overpressure and underpressure when the actuator is acted upon. For this purpose, only a corresponding arrangement of appropriately controlled by means of a control valve valves is provided. In particular, in the use of two or more chambers of the elastomeric bellows, it is possible to apply the one chamber of the actuator to the movement of the lever in one direction with pressure and to move the lever in the opposite direction to the other chamber of the actuator with negative pressure of the actuating means apply. For the pressurization is preferably a corresponding pump, provided for the vacuum application, a corresponding vacuum pump.

Preferably, the respective actuators are acted upon by at least one separate pump and controllable valves with the actuating means. Pump and valves are controllable by means of a control device so that the clamping device clamps the weft after its cutting off the abutment so that its spring back into the mixing tube, especially in elastic or highly elastic threads, can be prevented.

Preferably, the clamping device of the jet loom according to the invention is designed so that the lever dips into the opening of the mixing tube for movement into its clamping position and presses against the abutment for clamping the weft thread with the end of the lever. However, it is also possible that the lever at its end, "with which the clamping of the weft thread should take place, has an eyelet or bow-shaped, wherein the weft thread is guided by the bracket or the eyelet, to move into its clamping position itself moved in the direction of the opening of the mixing tube out and for clamping the weft thread with the end of the lever, by means of which the clamping takes place, pulls it against the abutment.

According to one embodiment of the invention, the actuator of the clamping device of the jet loom according to the invention is designed as a piezoelectric element. Due to the fact that the lever for direct clamping of the weft thread on the abutment performs a tilting movement, thus the necessary to realize the tilting motion paths of the actuator can be kept small depending on the lever length, it is possible to use a piezoelectric element as an actuating means for the Use actuator. The in the clamping devices according to the prior art as a result of their Linear movement required relatively large movement paths allow the use of piezo elements there at most only extremely limited. Another advantage of the use of piezoelectric elements as actuating means is that lines for supplying the actuator with an actuating means in the form of a fluid, as a gaseous or liquid medium, can be omitted and only relatively easy to be laid electrical leads are required. The control of the piezoelectric element by means of electricity has the further advantage that leaks in the supply fluid, ie the actuating means can not occur.

Preferably, the piezoelectric element is designed as a so-called stacking block or as a bending transducer and connected to the lever so that upon application of a current to the piezoelectric element, the lever performs the tilting movement. A so-called stack block consists of several layers of piezo elements, to which equally the current is applied so that the stack block tilts on one side and that the generable to be used movement path adds up according to the number of individual elements. The piezoelectric element in the form of a bending transducer is arranged on the longer leg of a preferably angled lever, wherein the piezoelectric bending transducer and the lever are dimensioned so that when applying the current to the piezoelectric element of the legs, which for clamping the Weft thread is provided on the abutment, dip into the opening of the mixing tube and can clamp the weft on the abutment.

According to a further embodiment of the invention, the opening in the mixing tube is mounted or formed so that the mixing tube is divided into a first and a second portion, wherein the first portion carries the actuator with the lever. The second section is formed significantly shorter than the first section and forms with its directed to the tissue end of the outlet opening of the mixing tube. Thus, the mixing tube is divided into two, wherein the abutment is mounted below the opening and thus connects the first and the second section of the mixing tube together. The fault may be located on the opposite side of the opening at which the lever begins to submerge in the opening. The abutment may preferably be glued to the two sections of the mixing tube or otherwise attached firmly adhering. Preferably, the abutment has an increased friction factor, so that the weft thread, when it is clamped by the lever in its clamping position, can be reliably held. The significantly shorter than the first section formed second section of the mixing tube has the function in terms of its function, that thus avoids that the free end of the weft thread after it has been cut off after its entry in the region of the outlet opening of the mixing tube, can not collide with the terminal and does not strike back after its entry into the shed. Due to the division of the mixing tube thus takes place a decoupling of the terminal from the thread end.

It is also possible that the abutment at the top of the split mixing tube connects its two sections together and the lever with its clamping causing and having an eyelet end passes through the abutment and causes the clamping of the weft thread, characterized in that the running through the eyelet weft is pulled against the abutment (clamping position).

According to one embodiment of the invention, in a jet loom, which is provided for a multi-colored fabric, the main blowing nozzles combined with their mixing tubes to form a block with up to eight main blowing nozzles and respective mixing tubes. In this block preferably two immediately adjacent mixing tubes are each provided on their opposite sides with an actuator with lever, i. the mixing tubes carry on their sides facing away from each other, d. h in a 180 ° arrangement each have an actuator with lever. Preferably, these two actuators are a modular unit, i. H. in pairs, summarized. Preferably, the modular unit is formed like a frame and thereby comprises both actuators with their corresponding levers. Thus, it is possible to provide four such modular units, each with a pair of actuators and associated levers in the immediate outlet opening region of the mixing tubes, without the individual mixing tubes must be arranged far apart due to the arrangement of the actuator and lever. The compact arrangement of the number of mixing tubes has the advantage that the respective colors or different materials of weft threads can be easily entered into the shed despite the multiple arrangement.

• Figur 1 in prinzipieller Ansicht eine Klemmeinrichtung gemäß einem ersten Ausführungsbeispiel der Erfindung mit Aktuator und Hebel in zusammengefügtem Zustand;
• Figur 2 das Ausführungsbeispiel gemäß Figur 1 in demontiertem Zustand;
• Figur 3a) ein weiteres Ausführungsbeispiel gemäß der Erfindung, bei welcher die Nicht-Klemmposition gezeigt ist;
• Figur 3b) für dieses Ausführungsbeispiel die Klemm-Position;
• Figur 4a) ein weiteres Ausführungsbeispiel der Erfindung, bei welchem der Aktuator mit Unterdruck beaufschlagt ist, in der Klemmposition;
• Figur 4b) das Ausführungsbeispiel gemäß Figur 4a) in der Nicht-Klemmposition;
• Figur 5a) ein weiteres Ausführungsbeispiel gemäß der Erfindung, bei welchem der Aktuator mit einem von einer Pumpe geförderten Hydraulik-Fluid beaufschlagt wird, in der Nicht-Klemmposition;
• Figur 5b) das Ausführungsbeispiel gemäß Figur 5a) in der Klemmposition;
• Figur 6a) ein weiteres Ausführungsbeispiel der Erfindung, bei welcher der Schussfaden durch Zug gegen eine Widerlage geklemmt wird, in der Klemmposition;
• Figur 6b) das Ausführungsbeispiel gemäß Figur 6a) in der Nicht-Klemmposition;
• Figur 7a) ein weiteres Ausführungsbeispiel der Erfindung mit einem Verstärkungsabschnitt des Hebels im Aktuator, in der Nicht-Klemmposition;
• Figur 7b) das Ausführungsbeispiel gemäß Figur 7a) in der Klemm-Position;
• Figur 8a) ein weiteres Ausführungsbeispiel gemäß der Erfindung, bei welchem der Hebel der Klemmeinrichtung gegenüber dem Mischrohr mit einem Federelement abgestützt ist, in seiner Nicht-Klemmposition;
• Figur 8b) das Ausführungsbeispiel gemäß Figur 8a) in der Klemm-Position;
• Figur 9a) ein weiteres Ausführungsbeispiel gemäß der Erfindung, mit pneumatisch beaufschlagtem Elastomerbalg, Federelement und einer Biegestütze, in Nicht-Klemmposition;
• Figur 9b) das Ausführungsbeispiel gemäß Figur 9a) in der Klemm-Position;
• Figur 10a) ein Ausführungsbeispiel gemäß Figur 9, bei welchem das Biegeelement gleichzeitig als Federelement ausgebildet ist, in der Nicht-Klemmposition;
• Figur 10b) das Ausführungsbeispiel gemäß Figur 10a) in der Klemm-Position;
• Figur 11a) ein weiteres Ausführungsbeispiel der Erfindung, bei welchem der Aktuator zwei Kammern aufweist, welche unterschiedlich mit Betätigungsmittel beaufschlagbar sind, in einer halb in eine Öffnung des Mischrohres eingetauchten Nicht-Klemmposition des Hebels;
• Figur 11b) das Ausführungsbeispiel gemäß Figur 11a) bei Druckbeaufschlagung einer Kammer, in der Klemm-Position;
• Figur 11c) das Ausführungsbeispiel gemäß Figur 11a) bei Druckbeaufschlagung der anderen Kammer und aus der Öffnung des Mischrohres ausgetauchtem Hebel, in der Nicht-Klemmposition;
• Figur 12 ein weiteres Ausführungsbeispiel gemäß der Erfindung mit in Längsrichtung des Mischrohres hintereinander angeordneten zwei Kammern des Aktuators mit einem in eine Zwischenwand zwischen den Kammern eingreifenden Abschnitt des Hebels und einem Federelement zwischen abgewinkeltem kurzen Schenkel des Hebels, in der Nicht-Klemmposition;
• Figur 13a) das Ausführungsbeispiel gemäß Figur 12 bei Druckbeaufschlagung einer Kammer und völlig aus der Öffnung des Mischrohres ausgefahrenen Hebel, in der Nicht-Klemmposition;
• Figur 13b) das Ausführungsbeispiel gemäß Figur 12 bei Druckbeaufschlagung der anderen Kammer, in der Klemm-Position;
• Figur 14a) noch ein weiteres Ausführungsbeispiel der Erfindung mit einem Aktuator mit zwei Kammern, wobei die Kammern senkrecht zur Längsachse des Mischrohres angeordnet sind, und zusätzlich vorgesehenem Biegeelement zwischen dem Hebel und dem Mischrohr, in der Nicht-Klemmposition;
• Figur 14b) das Ausführungsbeispiel gemäß Figur 14a) in der Klemm-Position;
• Figur 15a) noch ein weiteres Ausführungsbeispiel gemäß der Erfindung mit einem Piezo-Element als Aktuator in der Nicht-Klemmposition;
• Figur 15b) das Ausführungsbeispiel gemäß Figur 15a) in der Klemm-Position;
• Figur 16a) noch ein weiteres Ausführungsbeispiel gemäß der Erfindung mit einem Piezo-Element als Stapel-Block, in der Nicht-Klemmposition;
• Figur 16b) das Ausführungsbeispiel gemäß Figur 16a) in der Klemm-Position;
• Figur 17a) ein weiteres Ausführungsbeispiel gemäß der Erfindung mit einem Piezo-Element in Form eines Biegewandlers auf dem Hebel, in der Nicht-Klemmposition;
• Figur 17b) das Ausführungsbeispiel gemäß Figur 17a) in der Klemm-Position;
• Figur 18 in prinzipieller Darstellung eine Gesamtansicht eines Blockes von Hauptblasdüsen mit Mischrohren und Klemmeinrichtung auf einer Weblade;
• Figur 19 eine Moduleinheit, bei welcher zwei Klemmeinrichtungen in zueinander gegenüberliegender Anordnung rahmenförmig zusammengefasst sind; und
• Figur 20 eine Einheit, bestehend aus vier Hauptblasdüsen mit entsprechenden Mischrohren und zwei, jeweils zwei Klemmeinrichtungen zweier benachbarter Mischrohre zusammenfassender Moduleinheiten.

Further advantages, features and applications of the present invention will now be explained in detail with reference to embodiments and the accompanying drawings. In the drawing show:

• FIG. 1 in a schematic view of a clamping device according to a first embodiment of the invention with actuator and lever in the assembled state;
• FIG. 2 the embodiment according to FIG. 1 in disassembled condition;
• FIG. 3a ) Another embodiment according to the invention, in which the non-clamping position is shown;
• FIG. 3b ) For this embodiment, the clamping position;
• FIG. 4a ) Another embodiment of the invention, in which the actuator is subjected to negative pressure, in the clamping position;
• FIG. 4b ) According to the embodiment FIG. 4a ) in the non-clamping position;
• FIG. 5a ) Another embodiment according to the invention, in which the actuator is supplied with a pumped by a pump hydraulic fluid, in the non-clamping position;
• FIG. 5b ) According to the embodiment FIG. 5a ) in the clamping position;
• FIG. 6a ) Another embodiment of the invention, in which the weft thread is clamped by train against a counterplate, in the clamping position;
• FIG. 6b ) According to the embodiment FIG. 6a ) in the non-clamping position;
• Figure 7a ) Another embodiment of the invention with a reinforcing portion of the lever in the actuator, in the non-clamping position;
• FIG. 7b ) According to the embodiment Figure 7a ) in the clamping position;
• FIG. 8a ) Another embodiment according to the invention, in which the lever of the clamping device relative to the mixing tube is supported by a spring element, in its non-clamping position;
• FIG. 8b ) According to the embodiment FIG. 8a ) in the clamping position;
• FIG. 9a ) Another embodiment according to the invention, with pneumatically acted elastomeric bellows, spring element and a bending support, in non-clamping position;
• FIG. 9b ) According to the embodiment FIG. 9a ) in the clamping position;
• FIG. 10a ) An embodiment according to FIG. 9 in which the bending element is simultaneously formed as a spring element, in the non-clamping position;
• FIG. 10b ) According to the embodiment FIG. 10a ) in the clamping position;
• FIG. 11a ) A further embodiment of the invention, in which the actuator has two chambers, which are differently acted upon by actuating means, in a half-immersed in an opening of the mixing tube non-clamping position of the lever;
• FIG. 11b ) According to the embodiment FIG. 11a ) when pressurizing a chamber, in the clamping position;
• FIG. 11c ) According to the embodiment FIG. 11a ) upon pressurization of the other chamber and out of the opening of the mixing tube leaked lever, in the non-clamping position;
• FIG. 12 a further embodiment according to the invention with in the longitudinal direction of the mixing tube successively arranged two chambers of the actuator with an engaging in an intermediate wall between the chambers portion of the lever and a spring element between the angled short leg of the lever, in the non-clamping position;
• FIG. 13a ) According to the embodiment FIG. 12 when a chamber is pressurized and lever fully extended from the opening of the mixing tube, in the non-clamping position;
• FIG. 13b ) According to the embodiment FIG. 12 when pressurizing the other chamber, in the clamping position;
• Figure 14a ) Yet another embodiment of the invention with an actuator having two chambers, wherein the chambers are arranged perpendicular to the longitudinal axis of the mixing tube, and additionally provided bending element between the lever and the mixing tube, in the non-clamping position;
• FIG. 14b ) According to the embodiment Figure 14a ) in the clamping position;
• FIG. 15a ) Yet another embodiment according to the invention with a piezoelectric element as an actuator in the non-clamping position;
• FIG. 15b ) According to the embodiment FIG. 15a ) in the clamping position;
• FIG. 16a ) Yet another embodiment according to the invention with a piezo element as a stack block, in the non-clamping position;
• FIG. 16b ) According to the embodiment FIG. 16a ) in the clamping position;
• Figure 17a ) Another embodiment according to the invention with a piezoelectric element in the form of a bending transducer on the lever, in the non-clamping position;
• FIG. 17b ) According to the embodiment Figure 17a ) in the clamping position;
• FIG. 18 in a schematic representation of an overall view of a block of Hauptblasdüsen with mixing tubes and clamping device on a batten;
• FIG. 19 a modular unit, in which two clamping devices are combined in a frame-shaped arrangement opposite each other; and
• FIG. 20 a unit consisting of four main blowing nozzles with corresponding mixing tubes and two, in each case two clamping devices of two adjacent mixing tubes summarizing module units.

In FIG. 1 is an essential part of the clamping device 5 shown in preassembled state. A designed as a hollow profile elastomeric bellows is the actuator 6, which is supplied via a connection 26 with actuating means. A lever 7 with a long leg 7.1 and a short leg 7.2 is attached at its end of the long leg 7.1 by means of an unspecified profiling on the actuator 6. The actuator itself has a cross-sectionally circular passage 33, which serves to fix the actuator firmly on a (not shown) mixing tube. The diameter of this passage channel 33 is dimensioned so that the actuator 6 is firmly seated after its mounting on the mixing tube. The angled short leg 7.2 of the lever 7 is folded at its lower end on a piece of its length on itself, so that at its lower end a radius is present, at which the actual clamping of the weft thread (not shown) takes place. With the radius at the end of the short leg 7.2, the weft thread is gently clamped.

In FIG. 2 is a schematic representation of the embodiment according to FIG. 1 shown, but in disassembled form. The actuator 6 has a connection 26 for the actuating means and is further provided with a flat hollow profile 34 and a lever receptacle 35. The lever 7 consists of a folded profile with a long leg 7.1 and a substantially perpendicular thereto angled short leg 7.2. For stiffening and attachment to the actuator 6, the lever 7 in the longitudinal direction to the long leg 7.1 extending bends. With the short leg 7.2, the thread to be clamped is pressed gently on a (not shown) abutment. At its opposite end of the short leg 7.2, the lever has a U-shaped reinforcing portion 27 which can be placed on the actuator 6 when mounting the lever 7 on the actuator 6 and which by the side legs of the U-shaped profile lateral stability for creates the actuator. The U-shaped profile is connected via a spring element 12 with the long leg 7.1 of the lever 7. If the actuator 6 is transferred in its flat hollow profile 34 by acting on the actuating means from the neutral unpressurized state in a deformed state, the flat hollow profile is expanded, whereby the lever 7 undergoes a tilting movement and the short leg 7.2 a weft in the direction of the the (not shown) abutment presses formed clamping surface.

In the embodiment of the invention shown in schematic representation according to FIG. 3 the actuator 6 is provided with a chamber 10, which also serves as a flat hollow profile 34 (see FIG. 3a ) is trained. The lever 7 is connected by a plug connection with the actuator 6. In the unpressurized state, in which the supply line 29 for the actuating means relative to the chamber 10 is depressurized, the lever 7 is in the non-clamping position, ie is not immersed in the opening 8 in the mixing tube 2.

In FIG. 3b ), the state is shown in which via a pressure source and a controlled valve 16 actuating means is introduced via the supply line 29 into the chamber 10. Characterized the chamber 10 is inflated / deformed, and the chamber bounding webs with the web, in which the lever 7 is inserted by means of a plug-in, thereby undergo a deformation. The connector and the webs are designed so that upon deformation of the chamber 10, the lever 7 performs a tilting movement, whereby this dips with its short leg 7.2 in the opening 8 of the mixing tube and the weft thread 3 on the clamping surface forming abutment 9 and pushes thus holding in place. The mixing tube is divided by the opening 8 into two parts, namely a first section 2.1 and a second section 2.2, which are interconnected on their underside by the abutment 9. The second section 2.2 of the mixing tube 2 is designed significantly shorter than the first section 2.1 of the mixing tube. This second section 2.2 has mainly the function of preventing the cut end of the weft thread 3 from colliding with the clamping device.

In FIG. 4 an embodiment is described that according to FIG. 3 is similar, with the difference that instead of an overpressure, the chamber 10 is acted upon by a vacuum generated by means of a vacuum pump via a corresponding controllable valve. In the depressurized ground state ( FIG. 4a )), the lever 7 is connected to the actuator 6 so that the clamping device is in its clamping position 13. When a negative pressure is applied to the chamber 10 of the actuator 6, the chamber is also deformed, namely inwardly, which causes the lever 7 performs its tilting movement and out of the opening 8 of the mixing tube between the two sections 2.1. and 2.2 so that this position represents the non-clamping position 14.

The embodiment according to the FIGS. 5a) and 5b ) corresponds to the basic structure according to FIG. 4 , The difference, however, is that instead of a gaseous actuating means, a hydraulic fluid is used, which is supplied via pumps of the respective chamber 10 of the actuator 6. When pressure is applied to the chamber 10, a tilting movement of the lever 7 out of its non-clamping position 14 into its clamping position 13 is caused by deformation of, inter alia, the chamber delimiting the end of the long leg of the lever 7. In the clamping position 13 presses the lower end of the short leg of the lever 7 on the abutment 9 and clamped between its lower edge and the abutment 9, the weft thread 3 reliably.

In FIG. 6 a further embodiment of the invention is shown, in which the actuator 6, the basic structure according to the embodiments according to FIGS. 4 and 5 in which, however, in which the clamping action of the lever 7 on the abutment 9 is not achieved by pressure but by its train. For this purpose, the lever 7 is connected to the actuator 6 so that in the unpressurized state, the lever pulls the weft thread against the abutment 9 and clamps there. The short leg of the lever 7 passes through the abutment 9, which is arranged at the top of the subdivided into the two sections 2.1 and 2.2 mixing tube. The clamping of the weft thread forming end of the short leg of the lever 7 is formed as an eyelet 28 or bow-shaped and is penetrated by the weft thread 3. From a pressure source is actuated via a controllable valve 16 and the supply line 29 for actuating means with overpressure actuating means in the chamber 10 of the actuator 6, whereby this chamber 10 is inflated and thus deformed. By this deformation of the chamber 10 of the long leg of the lever 7 receiving, the chamber 10 limiting web is deformed so that the short, angled leg of the lever 7 with its eye 28 and its bow-shaped formation the opening 8 between the two sections 2.1 and 2.2 of the mixing tube until reaching down through, so that the weft thread 3 is released. The clamping device is thus in its non-clamping position 14.

FIG. 7 shows a further embodiment of the invention, in which for the lever 7, no separate spring element is provided, but the spring element is arranged in the lever itself or between the reinforcing portion 27 and the long leg 7.1, so that the lever of a short leg 7.2, a long leg 7.1, a spring element 12 and a reinforcing section 27, wherein all parts are integral with each other or with each other. Both the long leg 7.1 of the lever 7 and the spring element 12 and also the reinforcing section 27 are arranged in the elastomeric trained 6 Akutator. The rubber-elastic actuator 6 has a chamber 10 which, when exposed to overpressure of the actuating medium via the valve 16, which is a 2/4 way valve, leads to a deformation of the rubber-elastic actuator 6 with the result that the lever 7 by means of a tilting movement its non-clamping position (see Figure 7a )) in the clamping position according to FIG. 7b ) is brought. The force which is caused by the pressure of the actuating means and thus the deformation of the rubber-elastic actuator 6 is greater than the spring force of the spring element 12, the spring force must be overcome in deformation of the rubber-elastic actuator 6 to the lever 7 from the non- Clamping position 14 to bring in the clamping position 13. In the clamping position 13 is dipped by the deformation of the rubber-elastic actuator of the short leg 7.2 in the opening 8 of the existing sections 2.1 and 2.2 mixing tube, whereby the weft thread 3 is pressed against and on the abutment 9 to its terminals. When the controllable valve 16 is in its second position in FIG FIG. 7 is shifted to the left and thus the pressure in the chamber 10 of the actuator 6 is equal to the ambient pressure, the force of the spring element 12 causes a tilting movement from the clamping position 13 back to the non-clamping position 14, without the addition of either vacuum applied to the chamber 10 or a second chamber must be provided, which would then also be acted upon against the action of the first chamber 10 with the actuating means. From the controllable valve 16, the actuating means passes through the supply line 29 for the actuating means in the chamber 10 and causes at a pressure greater than the ambient pressure in FIG. 7b ) shown deformation of the rubber-elastic actuator.

In FIG. 8 an embodiment is shown which corresponds to that of FIG. 7 is similar. The lever 7 is with respect to its structure relative to the in FIG. 7 shown clearly simplified and has only a long leg 7.1 and a short leg 7.2. With its one end of the long leg 7.1 of the lever 7 is fixed in the formed as a flat hollow profile 34 rubber elastic actuator 6, preferably vulcanized or glued. The attachment of this end of the long leg 7.1 is carried out so that upon deformation of the rubber-elastic actuator 6 as a result of pressurization with the actuating means via the valve 16 and the supply line 29 into the chamber 10 in this is deformed and thus against the effect of the force of the spring element 12 of the lever 7 with its short end 7.2 in the opening 8 of the existing from sections 2. 1 and 2.2 mixing tube - a tilting movement - immersed. By dipping the weft thread 3 is pressed against the abutment 9 and thus clamped there. After the actuating means in the chamber 10 is set to a pressure equal to the ambient pressure, which can be achieved for example by the valve 16 is switched to a non-forward position, the force of the spring element 12 exceeds the deformation force of the part of the rubber-elastic actuator. 6 , which carries the end of the long leg 7.1 of the lever 7, so that the lever due to the force of the spring element 12 is a tilting movement of the clamping position 13 according to FIG. 8b ) in the non-clamping position 14 according to FIG. 8a ) is transferred.

In FIG. 9 a further embodiment of the invention is shown, in which in addition to a chamber 10 which can be acted upon by the pressure of the actuating means, so as to cause a tilting movement of the lever 7, and a next to the end of the long leg 7.2 of the lever 7 arranged spring element 12th In addition, a bending element 30 is provided. Between the short leg 7.2 of the lever 7 and the bending element 30, the chamber 10 is arranged, which is acted upon via a supply line 29 with the actuating means. In the in FIG. 9a ) is the controllable valve 16 in its locked position, so that actuating means is not transmitted, thus the chamber 10 is not acted upon by actuating means. In the in FIG. 9b ) shown clamping position 13 is deformed by the pressurization of the chamber 10 with the actuating means, so that due to their arranged substantially perpendicular to the long leg 7.1 longitudinal axis a deformation-related shortening occurs. By this shortening of the longitudinal extension of the chamber 10, the angled short leg 7.2 of the lever 7 is tilted into the opening 8 between the first section 2.1 and the second section 2.2 of the mixing tube, whereby a clamping of the weft thread 3 takes place on the abutment 9. The abutment 9 connects the first section 2.1 with the second section 2.2 of the mixing tube. The rubber-elastic actuator with only one chamber 10 is arranged at right angles to the longitudinal direction of the main nozzle. A bending element in the form of a flexure, preferably made of elastomer causes upon pressurization of the chamber 10, a tilting of the lever 7. When the pressurization of the chamber 10 by changing the position of the valve 16 from its in FIG. 9b ) shown position in the FIG. 9a ), the force of the spring element 12 pulls on the long leg 7.1 of the lever and tilts this again back to the non-clamping position 14, as in FIG. 9a ) is shown.

One in its function to the embodiment according to FIG. 9 similar embodiment is in FIG. 10 shown. The only difference is that the additional spring for tilting back of the lever 7 in the non-clamping position 14 is omitted. The elastic spring element and the bending element 30 are combined to form a single element, so that the restoring force of the spring element is applied by the elastic bending element 30. The function and structure are otherwise the same as in the embodiment FIG. 9 ,

In FIG. 11 is yet another embodiment shown according to the invention, in which the rubber-elastic actuator 6 has two actuatable means actuatable chambers 10, 11. The lever 7 is fastened in the actuator 6 in a web between the chambers 10 and 11, with one end of its long leg 7.1. Its short leg 7.2 is arranged substantially at right angles to the long leg and is intended to dip into the opening 8 between the first section 2.1 and the second section 2.2 of the mixing tube and to clamp the weft thread 3 against the abutment 9. Unlike the previously described embodiments, there is next to the clamping position 13 and the non-clamping position 14, in which the lever with its short leg is completely out of the opening 8 of the mixing tube, yet another non-clamping position 14.1, in which the lever with its short end is only partially immersed in the opening 8 of the mixing tube, the weft yarn 3 but not yet clamped. Such a condition is in FIG. 11a ), in which the pressure in the chamber 10 is equal to that in the chamber 11. With such a pressure balance (p ₁ = p ₂ ), the actuator 6 experiences no deformation with respect to the end of the lever with which it is fixed in the actuator. The lever 7 and the actuator 6 are now dimensioned or arranged on the mixing tube such that the short leg 7.2 of the lever 7 only partially immersed in undeformed actuator 6 in the opening 8 of the mixing tube. If now the transfer of the lever 7 from the partially submerged non-clamping position 14.1 be achieved in the clamping position 13, this can for example be done by the chamber 10 is subjected to a pressure of the actuating means, which is greater than the pressure of the actuating means in the chamber 11 (p ₂ > p ₁ ). Thereby, the web between the chambers 10, 11 of the actuator 6, in which the lever 7 is fixed, upwards deflected, causing the lever 7 undergoes a tilting movement and immersed with its short leg 7.2 in the opening 8 between the first section 2.1 and the second section 2.2 of the mixing tube and the weft yarn on the abutment 9 reliably clamped (see FIG. 11b) , If the lever in the non-clamping position 14 are transferred from the clamping position 13 and completely dive out of the mixing tube, so that the running of the weft thread 3 in the mixing tube is completely unaffected by the angled end (short leg) of the lever 7, this can be achieved be that the chamber 11 is subjected to a pressure which is greater than the pressure of the actuating means in the chamber 10 (p ₁ > p ₂ ). This condition is in FIG. 11c ). Although the structure of the elastomeric Akuators 6 with two chambers 10, 11 is slightly more complex than in the case of a single-chamber actuator, however, an actuator with two chambers has the advantage that optionally with the non-clamping position 14.1 and thereby with less pressure of Actuating means can be worked as in the case with an actuator with a single chamber, because in the former case, the paths of the tilting movement of the lever 7 are smaller.

Another embodiment according to the invention is in FIG. 12 shown. According to this embodiment, the actuator 6 has two longitudinally successive chambers 10, 11, which are separated by an unillustrated partition. Both chambers 10, 11 are acted upon separately via supply lines 29 with the actuating means. The lever 7 is fixed with an additionally angled end of the long leg 7.1 in the intermediate wall between the chambers 10, 11. The short leg 7.2 is angled twice, wherein the part of the short leg 7.2, which is provided directly for the clamping of the weft thread 3 in the mixing tube, is arranged substantially perpendicular to the long leg 7.2, wherein an approximately 45 ° formed intermediate region of the short Schenkel is provided. On the actuator 6 facing inside of the short leg 7.2 of the lever designed as a spring plate spring element 12 is provided, against which over a deformation of either the chamber 10 or the chamber 11, the tilting movement of the lever 7 must be achieved. In zero position of the lever 7 according to FIG. 12 the short leg 7.2 is partially immersed in the opening 8 between the first section 2.1 and the second section 2.2 of the mixing tube (similar to the one in FIG FIG. 11a ) described position). The clamping itself takes place on the abutment 9 - as in the other embodiments also - instead, with the preferably rounded end of the short leg 7.2 of the lever 7 presses the thread against the abutment 9 and clamps there reliably. The partially submerged position of the Levers 7 represents the non-clamping position 14.1. Through targeted pressurization of the respective chamber 10, 11, both the opening and the closing of the clamping device can be triggered in a defined manner.

In FIG. 13 are the two positions non-clamping position 14 and clamping position 13 for the embodiment according to FIG. 12 shown. In FIG. 13a ), the first chamber 10 is acted upon by an increased pressure of the actuating means, wherein as a controllable valve 16, a 4/2-way valve is present. By pressurizing the chamber 10 with actuating means this chamber deforms into a nearly barrel-shaped form, whereby their longitudinal extent is shortened. This leads at the same time to an extension of the longitudinal extent of the chamber 11, which has the overall result that against the action of the force of the spring element 12, the lever 7 is completely tilted out of the opening 8 of the mixing tube, thus the non-clamping position 14 is taken. By simply switching the 4/2-way valve 16 in its second position is achieved that actuating means is introduced at an increased pressure in the chamber 11, whereas the chamber 10 remains pressure-free. As a result, the chamber 11 assumes a substantially barrel-shaped shape, resulting in a shortening of its longitudinal extent and simultaneous extension of the chamber 10. Due to this deformation, the lever 7 is tilted into the opening 8, immersed in the opening 8 in the mixing tube between the first section 2.1 and the second section 2.2 and pushes the weft 3 against the abutment 9 and thus clamps this reliable (see FIG. 13b )).

According to a further embodiment of the invention is in FIG. 14 a rubber-elastic actuator 6 with two chambers 10, 11 arranged at right angles to the longitudinal extent of the main nozzle. The rubber-elastic actuator also has two longitudinally successive chambers 10, 11, which are separated by an intermediate wall (not designated). In the intermediate wall, the end of the long leg of the lever 7 is held. The actuator 6 provided with two chambers 10, 11 is mounted on the mixing tube by means of a double-angled support. Both chambers 10, 11 are separately acted upon via turn a 4/2-way valve 16 and corresponding supply lines 29 with actuating means. In addition to the two-chamber actuator, an elastic bending element 30 is arranged between the actuator and the short leg 7.2 of the lever 7. This elastic bending element 30 on the one hand causes additional support and on the other hand acts also as a spring element. The tilting axis of the lever 7 extends through the upper region of the bending element 30.

In the position of the controllable valve 16 according to Figure 14a ), the lower chamber 11 1 is subjected to increased pressure of the actuating means, whereby this chamber assumes a barrel-shaped shape and shortens in its longitudinal extent. The lever 7 is thus pulled around its tilting axis on the bending element with its end in the intermediate wall between the chambers 10 and 11 down, so that the short leg 7.2 completely emerges from the opening 8 between the sections 2.1 and 2.2 of the mixing tube. This represents the non-clamping position 14 with a fully exposed short leg of the lever 7. In the position of the controllable valve 16 according to FIG FIG. 14b ), the upper chamber 10 of the actuator 6 is subjected to increased pressure of the actuating means, whereby it assumes a barrel-shaped form. This shortens their longitudinal extent, as a result of which the end of the long leg located in the intermediate wall between the chambers 10, 11 is pulled upwards about the pivot point or the tilting axis located on the bending element. As a result, the short leg of the lever 7 is tilted into the opening 8 of the mixing tube, so that the underside of the short leg 7.2 reliably clamps the weft thread against the abutment 9.

In the FIGS. 15 . 16 and 17 Further embodiments are shown according to the invention, in which instead of the case of a rubber-elastic actuator deformation of the same effecting chambers piezo elements are provided. These piezo elements perform a contraction when driven by a current. This contraction is in the embodiments according to the FIGS. 15 . 16 and 17 transmitted in different ways to the actual clamping causing lever 7. According to FIG. 15a ) is provided a bracket 31, with which the lever 7 is integrally connected. In an analogous manner, the lever 7 has a long leg and a short leg. The short leg is substantially at right angles angled to the long leg. Between the holder 31 and the end of the long leg of the lever 7, a cross-sectional weakening 35 is provided, which causes a lighter tilting movement of the lever 7 when Beaufschlagung.des piezoelectric element 24 with a current. For this purpose, a stack of piezo-elements 24 is connected via a connecting member 32 with the underside of the long leg of the lever 7. In an analogous manner to the other embodiments, the mixing tube is divided into a first section 2.1 and a second section 2.2 and has in the region of Clamping an opening 8 and the opening 8 opposite abutment 9. In FIG. 15a ), the non-clamping position 14 is shown, in which the piezo-elements 24 are not energized.

If according to FIG. 15b ) are supplied with current to the piezoelectric elements 24, the piezo elements combined into a stack perform a contraction, which causes the connecting member 32, the lever 7 about the tilt axis at the weakened cross-section in the opening 8 between the two sections 2.1 and 2.2 of the mixing tube moved in against the abutment 9. As a result, the weft thread 3 is reliably clamped against the abutment 9.

However, it is also possible to provide a stack of piezo elements 24 in the form of a so-called stack block. This stack block is on the one hand directly to the end of the long leg of the lever 7, which is arranged opposite the angled, the clamping exporting short leg opposite, and on the other hand connected to the mixing tube. In an analogous manner, the mixing tube is divided into a first section 2.1 and 2.2, which are interconnected on the underside by a abutment 9. In FIG. 16a ), the non-clamping position 14 is shown in which the stacking block is not energized. If current is applied to the piezoelectric elements 24, with appropriate formation of the stack block, this can perform a one-sided contraction movement, whereby the lever 7 executes a tilting movement. The tilting movement causes the short leg of the lever 7 dips into the opening 8 between the first section 2.1 and the second section 2.2 of the mixing tube and reliably clamps the weft thread 3 against the abutment 9.

According to the in FIG. 17 illustrated embodiment, the piezoelectric element may also be provided in the form of a bending transducer 25, which is arranged on the side facing away from the mixing tube of the long leg of the lever 7 extending substantially over the entire length of the leg extending. The lever 7 is fixed to the end of the long leg, which is opposite to the angled end of the short leg, to a bracket 31, which in turn is secured to the mixing tube accordingly. Now, as it is in FIG. 17b ) is applied current to the bending transducer 25, it is curved. This curvature is transmitted to the lever 7 so that it performs a tilting movement about the attachment of the lever to the bracket 31, whereby the short leg of the lever 7 in the opening immersed in the mixing tube and the weft thread clamped on the abutment 9. This position represents the clamping position 13. The main advantage of the piezo-elements 24, 25 instead of a rubber-elastic actuator is that no additional supply lines with actuating means in the form of compressed air, for example, or hydraulics must be provided, but rather easy to be laid electrical Lines can be arranged. The need for valves for acting on chambers in a rubber-elastic actuator is omitted in these embodiments as well.

In FIG. 18 In principle, an arrangement of a block of main nozzles 1 with corresponding mixing tubes 2 for a jet loom for weaving with eight colors or eight different materials of weft threads is shown. The main nozzles are the weft threads 3 respectively supplied. The main nozzles 1 are provided via a distributor 23 with blown air. The distributor 23 is supplied with compressed air via a central air supply 22. At the end of the mixing tubes 2 of the main nozzle block 17, a clamping device 5 is provided, which divides the mixing tubes into a first section 2.1 and a second section 2.2. From the outlet of the corresponding mixing tube 2, the weft thread is introduced into a weft insertion channel 36 in the reed 21. Between the outlet opening of the mixing tube 2 and the weft insertion channel 36 is a pair of scissors 37, which cuts off the weft thread 3 after entry into the weft insertion channel 36 in the shed 4. By the movement of the sley 20 with the reed 21 of the weft yarn 3 is then struck at the binding point of the finished fabric (not labeled). The clamping device 5 is controlled by means of an additional air supply device via corresponding pumps 15 and valves 16 so that the weft thread 3, before it is cut by the scissors 37, can be clamped in the mixing tube 2, so that its spring back into the mixing tube is avoided. The valves 16 are controlled via a corresponding control device, not shown. This activation takes place depending on which weft thread has to be inserted or cut off.

So that a compact arrangement of the clamping device 5 can be ensured at the end of the block 17 of the main nozzles 1 with mixing tube 2, ie a possible dense arrangement of the ends of the mixing tubes can be ensured each other, the corresponding clamping devices are arranged on opposite sides of the mixing tubes. The mixing tubes are always arranged in pairs one above the other, so that a clamping device on the top and the clamping device of the underneath lying mixing tube is arranged on the underside thereof. By means of a module unit 18, which combines the two 180 ° to each other oppositely arranged clamping means by means of a frame-shaped construction, a high compactness is achieved. In an 8-pipe arrangement of the mixing tubes four such frame-shaped module units 18 are arranged side by side. In FIG. 19 such a modular unit 18 is shown. Recognizable in each case is a rubber-elastic actuator 6 and a thereto or lever 7 attached thereto. Upon appropriate loading of the rubber-elastic actuator 6, the lever 7 undergoes a tilting movement and dives with its short leg in the opening 8 between the first section 2.1 (not shown) and the second section 2.2 of the mixing tube. In addition to the compactness, the frame-shaped summary of two clamping devices also offers a rigid construction which withstands the reciprocating movement of the sley 20, including the accelerations occurring in the process.

To clarify how the module units 18 at the ends of the mixing tube 2, which point to the shed, the clamping devices combine in pairs, is in FIG. 20 a main nozzle assembly with four main nozzles 1 and four respective mixing tubes 2 and two such modular units 18 shown in a schematic view. FIG. 20 illustrates that despite the fact that each mixing tube 2 is provided with a clamping device 5 separately, which must be separately controlled, the individual mixing tubes 2 are arranged very compact and close to each other and in addition by the frame-shaped structure of the module unit 18 a stiffening in particular of Have end portion of the mixing tubes 2 of the block 17 of the main nozzle 1 and mixing tube 2.

It is understood that in addition to the numerous described embodiments of the invention, further possibilities for clamping devices 5 for a jet loom according to the invention are possible. Thus, it is possible to provide rubber-elastic or piezo-controlled actuators, which transmit their respective movement to a displaceable wedge element, which in turn causes a tilting movement of the clamping lever. It is also possible to cause the tilting movement of the lever of the clamping device by electromagnetic actuators.

Claims (14)

1. Jet-weaving machine, particularly air jet-weaving machine, with a main blow nozzle (1) with mixing tube (2) for the insertion of a weft thread (3) into a loom shed (4) by means of a transport fluid expelled from the main blow nozzle (1), and a single clamping device (5) which is active in the mixing tube (2) in the weft thread outlet region thereof, an actuator (6) arranged outside the mixing tube (2), a lever (7) connected to the actuator (6) in such a manner, which, when the actuator (6) is acted upon by an actuation means or when the action is discontinued, executes such a tilting movement so that the lever (7) clamps the weft thread (3) in an opening (8) of the mixing tube (2) between itself and a counter support (9).
2. Jet-weaving machine according to claim 1, in which the actuator (6) is an elastomeric bellows, in particular a rubber bellows, which comprises at least one chamber (10) and on which the lever (7) is fastened, whereby the chamber (10) is deformed by means of the actuation means and the deformation thereof produces the tilting movement of the lever.
3. Jet-weaving machine according to claim 1 or 2, in which the actuator (6) comprises two chambers (10, 11), at least one of which or both of which alternately can be acted upon by the actuation means, whereby the lever (7) is connected with the actuator (6) in the region between the chambers (10, 11) and carries out its tilting movement due to the deformation resulting from the action upon the respective chamber (10 or 11).
4. Jet-weaving machine according to one of the claims 1 to 3, in which the lever (7) is fastened on the mixing tube (2) with a spring element (12), which, when the actuator (6) is acted upon by the actuation means, is extended into a clamping position (13) due to the tilting movement of the lever (7), and, when the action upon the actuator (6) with the actuation means is discontinued, moves the lever (7) out of the clamping position (13) into a non-clamping position (14) by means of its return force.
5. Jet-weaving machine according to one of the claims 1 to 4, in which the lever (7) is plugged or adhesively bonded or vulcanized onto the actuator (6).
6. Jet-weaving machine according to one of the claims 1 to 5, in which the actuation means for the actuator (6) is the transport fluid, in particular air.
7. Jet-weaving machine according to claim 6, in which the actuator (6) can be acted upon with actuation means under overpressure or underpressure.
8. Jet-weaving machine according to one of the claims 1 to 7, in which the actuators (6) can be acted upon with the actuation means via at least one separate pump (15) and controllable valves (16), whereby the pump (15) and the valves (16) are so controllable by means of a control device such that, after the weft thread (3) has been cut off, the clamping device (5) so clamps the weft thread (3) on the counter support (9) such that it can be prevented from jumping back into the mixing tube (2).
9. Jet-weaving machine according to one of the claims 1 to 8, in which the lever (7) penetrates into the opening (8) of the mixing tube (2) in order to move into its clamping position (13) and presses with the end of the lever (7) against the counter support (9) for the clamping of the weft thread (3).
10. Jet-weaving machine according to one of the claims 1 to 8, in which the lever (7) comprises a bail or an eye (28) for leading through the weft thread (3), and, for the movement into its clamping position (13), moves in the direction out of the opening (8) of the mixing tube (2), and, for the clamping of the weft thread (3), pulls it against the counter support (9) with the end of the lever (7) comprising the eye (28) or the bail.
11. Jet-weaving machine according to claim 1, in which the actuator (6) comprises a piezo-element (19).
12. Jet-weaving machine according to claim 11, in which the piezo-element (19) is embodied as a stack block (24) or as a bending transducer or converter (25) and is so connected with the lever (7) such that the lever (7) carries out the tilting movement when a current is applied to the piezo-element (19).
13. Jet-weaving machine according to one of the claims 1 to 12, in which the opening (8) of the mixing tube (2) subdivides the mixing tube into a first (2.1) and a second portion (2.2), whereby the first portion (2.1) carries the actuator (6) with the lever (7), and the second portion (2.2) is embodied clearly shorter than the first portion (2.1), is arranged aligned to the first portion (2.1) in the axial direction, and forms with its end the outlet opening of the mixing tube (2), and whereby the counter support (9) comprises an increased friction factor, closes the opening (8) essentially on one side, and connects the first portion (2.1) and the second portion (2.2) of the mixing tube (2) with one another.
14. Jet-weaving machine according to one of the claims 1 to 13, in which a block (17) with up to eight main blow nozzles (1) and mixing tubes (2) is provided, in which respectively two mixing tubes (2) lying directly next to one another carry an actuator (6) with lever (7) respectively on their sides facing away from one another, whereby such a pair of actuators (6) and associated levers (7) is respectively combined as a modular unit (18).

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