EP1771610A1

EP1771610A1 - Jet-weaving machine, particularly an air jet-weaving machine, with a clamping device in the mixing tube

Info

Publication number: EP1771610A1
Application number: EP05775063A
Authority: EP
Inventors: Markus Gielen; Thomas Laukamp
Original assignee: Lindauer Dornier GmbH
Current assignee: Lindauer Dornier GmbH
Priority date: 2004-07-30
Filing date: 2005-06-24
Publication date: 2007-04-11
Anticipated expiration: 2025-06-24
Also published as: RU2343237C2; CN101023208B; JP4343248B2; JP2008508432A; BRPI0513983A; WO2006012821A1; US20080156390A1; DE102004036996B3; US7537029B2; ATE420985T1; DE502005006482D1; CN101023208A; RU2007107602A; EP1771610B1

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

Jet loom, in particular air jet loom, with a clamping device in the mixing tube

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 known from DE 32 00 638 A1. 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, a method for holding a weft thread in the region of a main nozzle of a jet loom and a jet loom for carrying out the method are known from DE 102 44 694 A1. In this known jet loom is in the front region, i. The tissue-facing outlet end of the mixing tube described a clamping device in the form of a pneumatic muscle. 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, DE 102 57 035 A1 discloses a weft thread tensioning device for a main nozzle device of an air-jet weaving machine. 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, JP 2000119936 discloses a device for holding the weft thread at the outlet of the mixing tube of a main blowing nozzle.

The clamping surface of e.g. acted upon by a spring clamping lever engages in an end present in the mixing tube longitudinal groove and is forcibly effective on a likewise end of the mixing tube existing abutment. 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 short path 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, ie compact 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 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 structurally designed with relatively small dimensions, especially in jet looms, which are provided with up to eight main blowing nozzles with respective mixing tube arranged 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.

Another advantage of the jet loom according to the invention in terms of their 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 generates 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 trained 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 invention

Jet loom 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-belt 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 in Direction moves out of the opening of the mixing tube and for clamping the weft thread with the end of the lever, by means of which the clamping takes place, this pulls 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.

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: Figure 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;

Figure 2 shows the embodiment of Figure 1 in disassembled state;

Figure 3a) shows another embodiment according to the invention, in which the non-clamping position is shown;

Figure 3b) for this embodiment, the clamping position;

Figure 4a), another embodiment of the invention in which the actuator is subjected to negative pressure, in the clamping position;

FIG. 4b) shows the embodiment according to FIG. 4a) in the non-clamping position;

FIG. 5a) shows another embodiment according to the invention, in which the actuator is acted on by a hydraulic fluid delivered by a pump, in the non-clamping position;

FIG. 5b) shows the embodiment according to FIG. 5a) in the clamping position;

Figure 6a) a further embodiment of the invention, in which the weft thread is clamped by train against an abutment, in the clamping position;

FIG. 6b) shows the embodiment according to FIG. 6a) in the non-clamping position;

Figure 7a) a further embodiment of the invention with a reinforcing portion of the lever in the actuator, in the non-clamping position;

FIG. 7b) shows the embodiment according to FIG. 7a) in the clamping position;

FIG. 8a) shows a further embodiment according to the invention, in which the lever of the clamping device is supported with respect to the mixing tube with a spring element, in its non-clamping position; FIG. 8b) shows the embodiment according to FIG. 8a) in the clamping position;

Figure 9a) another embodiment according to the invention, with pneumatically acted elastomeric bellows, spring element and a bending support, in non-clamping position;

FIG. 9b) shows the embodiment according to FIG. 9a) in the clamping position;

FIG. 10 a) shows an exemplary embodiment according to FIG. 9, in which the bending element is simultaneously designed as a spring element, in the non-clamping position;

FIG. 10b) shows the embodiment according to FIG. 10a) in the clamping position;

Figure 11a) shows another embodiment of the invention, in which the actuator has two chambers, which are different act on bar with actuating means, in a half in an opening of the mixing tube immersed non-clamping position of the lever;

FIG. 11b) shows the exemplary embodiment according to FIG. 11a) when a chamber is pressurized, in the clamping position;

FIG. 11c) shows the exemplary embodiment according to FIG. 11a) when the other chamber is pressurized and the lever has emerged from the opening of the mixing tube, in the non-clamping position;

Figure 12 shows a further embodiment according to the invention with in the longitudinal direction of the mixing tube arranged behind each other 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) shows the embodiment according to FIG. 12 when a chamber is pressurized and the lever is fully extended from the opening of the mixing tube, in the non-clamping position; FIG. 13b) shows the embodiment according to FIG. 12 when the other chamber is pressurized, in the clamping position;

Figure 14a) yet another embodiment of the invention with an actuator with two chambers, the chambers being 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) shows the embodiment according to FIG. 14a) in the clamping position;

Figure 15a) yet another embodiment according to the invention with a piezoelectric element as an actuator in the non-clamping position;

FIG. 15b) shows the embodiment according to FIG. 15a) in the clamping position;

Figure 16a) yet another embodiment according to the invention with a piezo element as a stack block, in the non-clamping position;

FIG. 16b) the embodiment according to 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) shows the embodiment according to FIG. 17a) in the clamping position;

FIG. 18 is a schematic representation of an overall view of a block of main blowing nozzles with mixing tubes and clamping device on a sley;

FIG. 19 shows a module unit in which two clamping devices are combined in a frame-like manner in an arrangement lying opposite one another; and

Figure 20 is 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 Figure 1, a substantial part of the clamping device 5 is shown in pre-assembled 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 Figure 2, the embodiment of Figure 1 is shown in a schematic representation, 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 plugged onto 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. When 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 thread in the direction of the the (not shown) abutment presses formed clamping surface. In the exemplary embodiment of the invention shown in FIG. 3, the actuator 6 is provided with a chamber 10, which is likewise designed as a flat hollow profile 34 (see FIG. 3a). 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.

FIG. 3 b) shows the state in which actuating means are admitted into the chamber 10 via the supply line 29 via a pressure source and a controlled valve 16. 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.

FIG. 4 describes an exemplary embodiment which is similar to that according to FIG. 3, with the difference that, instead of an overpressure, the chamber 10 is subjected to a vacuum generated by means of a vacuum pump via a corresponding controllable valve. In the unpressurized ground state (Figure 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 FIGS. 5a) and 5b) corresponds in its basic structure to that 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 to 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.

6 shows a further embodiment of the invention is shown, in which the actuator 6 has the basic structure according to the embodiments of Figures 4 and 5, in which, however, the clamping action of the lever 7 is achieved on the abutment 9 not 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 eyelet 28 and its bow-shaped training 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.

Figure 7 shows another 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 acted upon by 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 from its non-clamping position (see Figure 7a)) in the clamping position according to Figure 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 shifted to the left in its second position in FIG. 7 and 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 in addition either vacuum is 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 Figure 7b) shown deformation of the rubber-elastic actuator.

FIG. 8 shows an exemplary embodiment which is similar to that of FIG. The lever 7 is significantly simplified with respect to its structure compared to that shown in Figure 7 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, a tilting movement of the clamping position 13 according to Figure 8b) in the non-clamping position 14 according to Figure 8a) is transferred.

In Figure 9, another 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 one next to the end of the long leg 7.2 of the lever. 7 arranged spring element 12 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 non-clamping position 14 shown in Figure 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 clamping position 13 shown in Figure 9b) 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 flexure in the form of a flexible elastomeric flexure preferably causes the lever 7 to tilt when the chamber 10 is pressurized. When the chamber 10 is pressurized by changing the position of the valve 16 from its position shown in Figure 9b) to that shown in Figure 9a) Passes position, pulling the force of the spring element 12 on the long leg 7.1 of the lever and tilts this thus back into the non-clamping position 14, as shown in Figure 9a).

An embodiment similar in function to the exemplary embodiment according to FIG. 9 is shown in FIG. 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 the construction are otherwise identical to the exemplary embodiment according to FIG. 9.

FIG. 11 shows yet another exemplary embodiment according to the invention, in which the rubber-elastic actuator 6 has two chambers 10, 11 which can be acted upon by actuating means. 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 shown in Figure 11a), in which the pressure in the chamber 10 is equal to that in the chamber 11. With such a pressure balance (Pi = 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 so dimensioned or arranged on the mixing tube, that the short leg 7.2 of the lever 7 is only partially immersed in non-deformed 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 > Pi). 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 Figure 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 shown in Figure 11c). Although the structure of the rubber-elastic Akuators 6 with two chambers 10, 11 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 shown in FIG. 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 the neutral 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 position described in FIG. 11a). 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.

FIG. 13 shows the two positions non-clamping position 14 and clamping position 13 for the exemplary embodiment according to FIG. 12; In FIG. 13a), the first chamber 10 is subjected to an increased pressure of the actuating means, wherein a 4/2-way valve is present as the controllable valve 16. 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 thread 3 against the abutment 9 and thus clamps this reliable (see Figure 13b )).

According to a further embodiment of the invention, a rubber-elastic actuator 6 with two chambers 10, 11 is arranged at right angles to the longitudinal extent of the main nozzle in Figure 14. The rubber-elastic actuator also has two in

Longitudinally arranged one behind the other chambers 10, 11, which by a

Partition (not marked) are separated. 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 is between the actuator and the short

Leg 7.2 of the lever 7, an elastic bending element 30 is arranged. 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 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 fully exposed short leg of the lever 7. In the position of the controllable valve 16 according to Figure 14b), the upper chamber 10 of the actuator 6 is subjected to increased pressure of the actuating means, whereby it assumes a barrel-shaped. 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 to the resistance 9.

FIGS. 15, 16 and 17 show further exemplary embodiments according to the invention, in which piezo-elements are provided instead of the chambers causing a deformation of the rubber-elastic actuator. These piezo elements perform a contraction when driven by a current. In the exemplary embodiments according to FIGS. 15, 16 and 17, this contraction is transmitted in different ways to the lever 7 causing the actual clamping. According to Figure 15a), a holder 31 is provided, 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 upon application of the 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. FIG. 15 a) shows the non-clamping position 14, in which the piezo elements 24 are not supplied with current.

If, according to FIG. 15b), the piezo elements 24 are supplied with current, the piezo elements combined into a stack perform a contraction, which causes the connecting element 32 to interpose the lever 7 about the tilt axis at the weakened cross section into the opening 8 the two sections 2.1 and 2.2 of the mixing tube moved 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 Figure 16a), the non-clamping position 14 is shown, in which the stack 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 exemplary embodiment illustrated in FIG. 17, the piezoelectric element can also be provided in the form of a bending transducer 25, which is arranged extending substantially over the entire length of the leg on the side of the long leg of the lever 7 facing away from the mixing tube. 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. If, as shown in FIG. 17b), current is applied 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.

FIG. 18 shows, 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. 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. FIG. 19 shows such a modular unit 18. 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 illustrate how the module units 18 at the ends of the mixing tube 2, which point to the shed, the clamping means summarize in pairs, a main nozzle assembly with four main nozzles 1 and four respective mixing tubes 2 and two such modular units 18 is shown in a schematic view in Figure 20 , Figure 20 illustrates that despite the fact that each mixing tube 2 is provided separately with a clamping device 5, which must each be separately controllable, the individual mixing tubes 2 are arranged very compact and close to each other and through the frame-shaped structure of the modular unit 18 in addition a stiffening in particular of the end region of the mixing tubes 2 of the block 17 of main nozzle 1 and mixing tube 2 have.

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

claims

1. jet loom, in particular air jet loom, with a Hauptblasdüse (1) with mixing tube (2) for introducing a weft thread (3) in a shed (4) by means of one of the Hauptblasdüse (1) ejected

Transportfluids, and a single clamping device (5) which is effective in the mixing tube (2) in the weft exit region, an outside of the mixing tube (2) arranged actuator (6), with the actuator (6) such connected lever (7), which upon actuation of the actuator (6) with an actuating means or on omission of the admission such

Tilting movement executes that the lever (7) the weft thread (3) in an opening (8) of the mixing tube (2) between itself and a abutment (9) clamped.

2. jet loom according to claim 1, wherein the actuator (6) is an elastomer bellows, in particular a rubber bellows, which at least one chamber

(10) and to which the lever (7) is fixed, wherein by means of the actuating means, the chamber (10) is deformed and the deformation of which generates the tilting movement of the lever.

3. A jet loom according to claim 1 or 2, wherein the actuator (6) has two chambers (10, 11), of which at least one or both are mutually acted upon by the actuating means or, wherein the lever (7) in the area between the chambers (10, 11) is connected to the actuator (6) and performs its tilting movement from the action of the respective chamber (10 or 11) resulting deformation.

4. jet loom according to one of claims 1 to 3, wherein the lever (7) with a spring element (12) on the mixing tube (2) is fixed, which upon actuation of the actuator (6) with the actuating means by the tilting movement of the lever (7 ) is stretched in a clamping position (13) and at

Elimination of the Baufschlagung of the actuator (6) with the actuating means by means of its restoring force the lever (7) from the clamping position (13) in a non-clamping position (14) moves.

5. jet loom according to one of claims 1 to 4, wherein the lever (7) on the actuator (6) plugged or glued or vulcanized.

6. jet loom according to one of claims 1 to 5, wherein the actuating means for the actuator (6) is the transport fluid, in particular air.

7. jet loom according to claim 6, wherein the actuator (6) is acted upon by actuating means under pressure or negative pressure.

8. A jet loom according to one of claims 1 to 7, wherein the actuators (6) via at least one separate pump (15) and controllable valves (16) are acted upon by the actuating means, wherein the pump (15) and the valves (16) be controlled by a control device so that the clamping device (5) the weft thread (3) after its cutting at the abutment (9) so clamped that its spring back into the mixing tube (2) can be prevented.

9. A jet loom according to one of claims 1 to 8, wherein the lever (7) for movement into its clamping position (13) in the opening (8) of the mixing tube (2) is immersed and for clamping the weft thread (3) with the end of Press lever (7) against the abutment (9).

10. A jet loom according to any one of claims 1 to 8, wherein the lever (7) has a bracket or eyelet (28) for passing the weft thread (3) and for movement in its clamping position (13) in the direction of the opening ( 8) of the mixing tube (2) moves out and for clamping the weft thread (3) this with the eyelet (28) or the bracket having the end of the lever (7) against the abutment (9) pulls.

11. A jet loom according to claim 1, wherein the actuator (6) comprises a piezo element (19).

12. A jet loom according to claim 11, wherein the piezoelectric element (19) as a stack block (24) or as a bending transducer (25) and connected to the lever (7) is connected so that when applying a current to the piezoelectric Element (19) of the lever (7) performs the tilting movement.

13. A jet loom according to any one of claims 1 to 12, wherein the opening (8) of the mixing tube (2) the mixing tube in a first (2.1) and a second Section (2.2), wherein the first portion (2.1) carries the actuator (6) with the lever (7) and the second portion (2.2) is significantly shorter than the first portion (2.1) formed in the axial direction to the first Section (2.1) is arranged in alignment and forms with its end the outlet opening of the mixing tube (2) and wherein the abutment (9) has an increased friction factor, the opening (8) in

Substantially closes on one side and the first section (2.1) and the second section (2.2) of the mixing tube (2) interconnected.

14. A jet loom according to one of claims 1 to 13, wherein a block (17) with up to eight main blowing nozzles (1) and mixing tubes (2) is provided, in which each two immediately adjacent mixing tubes (2) each facing away from each other Side carry an actuator (6) with lever (7), wherein such a pair of actuators (6) and associated levers (7) is combined as a module unit (18).

Figure for summary