EP1508633A1 - Jet loom - Google Patents

Abstract

A jet weaving machine (1) comprises a monitoring apparatus (20) arranged at a receiving side (3) of weft insertion path (4) and includes a sensor device as a weft thread monitor (21) that is fixedly mounted on a weaving sley (9) and an another sensor device as a tube monitor (22). The monitoring apparatus further comprises a capture device (40) fixedly arranged on the weaving sley for holding and/or stretching weft thread, and a suction device (30) arranged on receiving side stationary with respect to machine frame and comprises tube monitor.

Description

The invention relates to a jet loom with a catcher side arranged monitoring device according to the preamble of independent claim.

In jet looms the weft insertion takes place by means of a fluid, which the respective weft thread from the firing side through the open shed enters the catcher side. In air jet looms is this serving as a transport medium fluid fluid.

For the weft insertion is on the shot side a defined and specifiable length of thread, which of course depends on the weaving width of withdrawn from the stationary winding drum of a yarn feeding device and fed to a main nozzle. The main nozzle is fed with compressed air and accelerates the weft thread into the opened shed. Along the Weft insertion path are usually several auxiliary or relay nozzles provided, which are also fed with compressed air and the Thread the weft through the shed onto the catcher side. To successful weft insertion is the front end of the weft z. B. captured and held by a stretching or catching nozzle and the weft is struck by the sley to the tissue. Then the Tray change, eliminating the weft thread over the entire weaving width is involved. Then, on the weft side, between the main nozzle and the thread edge facing her will be cut for to be ready for the next weft entry. On the catch side is the Registered weft also cut. The superfluous thread rest is disposed of by means of a suction or blowing device. The catcher side End of the registered weft thread can then, for example, by means a loading device after the tray change in the following open Shed are inserted.

To monitor the correct weft insertion, it is common both the Arrival of the weft to detect, within a certain Time window related to the Web cycle must be made, as well as the length to record the registered weft. Does not come the weft within the predefinable time window or it is detected as too long, As a rule, corrective measures or the stopping of the Machine necessary.

To get both the arrival time and the length of the weft On the capture side, two are called shotguards Sensors are provided, which are each designed so that they Weft or the weft tip can detect. The first Shotguard is usually directly at the fangseitigen end of Weft insertion path arranged. He detects if the weft tip is in the specified time window - based on the weaving cycle - arrives or Not. But only with this one sensor can not be, for example check whether the inserted weft thread is too long (long shot). Therefore, a second weft detector is provided, which is usually so is arranged that him the weft tip at a correct Weft entry not reached. With a correct weft insertion moves the weft tip to a position somewhere between the Both shotguards, so that the second sensor is no signal.

In known jet looms both firemen are firmly on the Batten mounted so that both synchronously with the oscillating motion Execute batten. For this it is necessary to place the weft between the lead the first and the second shotguard. A known solution consists in on the batten an auxiliary reed as a thread guide to Bridging the distance between the two firemen provided. Along this Hilfsriet are auxiliary nozzles for stretching or Keep the registered weft thread provided.

However, this construction with the Hilfsriet is relatively complicated and needed also space. Furthermore, the Hilfsriet has the disadvantage that there is an additional represents mass to be accelerated, which is the same oscillating Movement performs like the batten.

Starting from this prior art, it is an object of the invention to propose a jet loom, a catch-side Has monitoring device for the weft insertion, which without a Hilfsriet gets along without making concessions to the quality of Control of weft insertion are necessary. Furthermore, the Monitoring device for handling and disposal faulty registered shots can be used.

The task loosening jet loom is characterized by the features of independent claim characterized.

Thus, according to the invention, a jet loom is proposed in which a weft thread by means of a fluid from a firing side to a Fangseite is registerable, with a batten, along which a Weft insertion path extending, which sets a firing direction, as well as with a arranged on the catch side monitoring device, which two sensor devices for detecting the weft thread or parts the weft yarn, wherein exactly one of the sensor devices fixed mounted on the batten.

This firmly mounted on the sley sensor device is below referred to as a firefighter. Since only one of the Sensor devices, namely the firing monitor, catching at the end of Weft insertion path is mounted on the batten, and the other Sensor device is no longer provided on the batten, it requires no helper anymore to the weft between the two Lead sensor devices. This means a considerable space and Weight savings.

In addition, such a monitoring device has the advantage that the not mounted on the batten sensor device in further back described manner for monitoring, handling and, where appropriate can be used for the removal of faulty weft threads, for example in the context of automatic procedures for Shot troubleshooting. In known devices this is usually an additional, so third sensor device needed. On such a can be omitted in the inventive monitoring device, which is advantageous in terms of both equipment and cost.

In a preferred embodiment, a fixed on the sley is arranged Catching device intended for holding or stretching the weft thread, which comprises a catching nozzle and a catching pipe relative to each other are arranged such that by applying the catching nozzle with the Fluid, the tip of the weft thread is deflected into the catch tube. By This measure ensures that the correctly registered Weft until its striking and binding by the Subject change is held and stretched. By the deflection of the Weft tip results in an increase in the friction force and thus the Holding force acting on the weft.

Especially with rigid weft yarns, it is advantageous if the Trap pipe at an acute angle, preferably at an angle of 30 ° to 70 °, opens in the weft direction. At a right angle Confluence of the catch tube in the weft direction would namely the Risk that, especially with stiffer weft threads of the top of the weft impulse is too low, to a right-angled or to achieve even greater diversion.

Furthermore, it is with regard to the momentum transfer to the weft tip advantageous if the collecting nozzle is designed as a pressure nozzle and so is arranged that the jet emitted by the collecting nozzle in the same direction as the catch tube. This means that the Outlet direction of the catching nozzle with the input area of the catching pipe flees.

Another advantageous measure is a suction device for the weft or for parts thereof, which are fixed is arranged on the catching side with respect to the machine frame, and which comprises the other of the sensor devices as a pipe monitor. The second sensor device to provide in or on the suction device has the advantage that this sensor device both correct Weft insertion as well as in the context of weft fixes of Thread residues is passed and thus a cleaning effect is achieved.

From a practical point of view, it is preferable if the suction device an inlet funnel and an adjoining suction tube comprising, wherein the inlet funnel facing the catcher, the Pipe monitor is arranged in the region of the suction tube. The inlet funnel can then be configured with respect to its lateral extent so that it is the total amplitude of the oscillating motion of the output the weft insertion path or the catching device covers.

Also, it has proven to be advantageous a flexible connection line provide, which is connected on one side with the catching tube and on the other hand with an inlet which enters the suction device, preferably in the suction tube, opens.

Especially with regard to the handling of weft defects and the Removing incorrectly inserted weft threads is a preferred Measure, if the suction device with the fluid acted upon disposal nozzle, seen in the weft direction is located immediately in front of the pipe monitor. This disposal nozzle, the is preferably configured as a pressure or blowing nozzle, has the advantage that faulty weft threads that need to be removed from the shed, a greater tensile force is exercisable.

Especially when using an electrostatic tube monitor it is particularly advantageous, the disposal nozzle so on or in the suction tube to arrange that the emitted from the disposal nozzle jet of the fluid runs obliquely to the axis of the suction tube. This measure will the yarn to be disposed of deflected so that he better his charge to the Pipe monitor issues. The measure is also advantageous if the Pipe keeper includes an optical sensor, because the cleaning effect of the thread or thread residue is amplified on the optical sensor.

According to a particularly advantageous variant, the disposal nozzle and / or the inlet is asymmetrical with respect to the longitudinal axis of the Suction tube arranged. Due to the asymmetric alignment of the Disposal nozzle and / or the inlet receives the thread or the Thread residue a twist and moves rotating along the inner wall of the Suction tube. This can be strengthened on the one hand, the cleaning effect and on the other hand, in the case of an electrostatic tube guard, the Charge delivery from the thread to the pipe monitor can be improved. In a preferred embodiment, therefore, the pipe monitor includes a electrostatic sensor and the disposal nozzle is arranged such that the jet of fluid emitted by the disposal nozzle is static Increased charge of the thread and distracted the thread so that he his Charge to the electrostatic sensor.

According to a preferred variant, the pipe monitor comprises a optical sensor, and the inlet to the suction device is such arranged that during the normal operation of the Catching device caught thread residues R the optical sensor constantly clean.

Another preferred measure is to provide means to the Distance between the sensor device on the sley (ie the Firing guard) and the pipe guard. This will make it to Example possible, the criteria for monitoring long shots change and adapt to the particular application.

Further advantageous measures and embodiments of the invention result from the dependent claims.

Fig.1:

Wesentliche Teile eines Ausführungsbeispiels einer erfindungsgemässen Düsenwebmaschine,

Fig. 2:

eine Variante für die Überwachungsvorrichtung,

Fig. 3:

eine Darstellung zur Illustration des Entfernens eines Schuswsfadens,

Fig. 4:

einen Längsschnitt durch ein Absaugrohr mit einem Rorwächter, und

Fig.5-6

jeweils einen Querschnitt durch das Absaugrohr für Varianten der Absaugeinrichtung.

In the following the invention will be explained in more detail by means of embodiments and with reference to the drawing. In the schematic drawing show partly in section:

Fig.1:

Essential parts of an embodiment of a novel jet loom,

Fig. 2:

a variant for the monitoring device,

3:

a representation to illustrate the removal of a Schuswsfadens,

4:

a longitudinal section through a suction tube with a Rorwächter, and

Fig.5-6

in each case a cross section through the suction tube for variants of the suction device.

Fig. 1 shows a schematic representation of essential parts of a Embodiment of a novel jet loom, especially an air jet loom, which in total with the Reference numeral 1 is designated. In itself well known components the air jet machine such as drive, warp beam, fabric take-off, electronic Control and drive devices, etc. are for better reasons Overview not shown.

In the jet loom 1, a weft thread S by means of a fluid, here air, from a firing side 2 on a catching side 3 along a Weft insertion 4 entered. The weft insertion path 4 sets the Shot direction fixed, which is indicated in Fig. 1 by the arrow A.

The jet loom 1 comprises a yarn package 5, of which the Weft S withdrawn by means of a winding device, not shown and in the form of multiple windings on a winding drum 6 as Thread reserve is stored.

For the weft insertion is a predetermined thread length of the Winding drum 6 subtracted until a yarn stopper 61 a further stripping prevented. The weft S is fed by a compressed air Main nozzle 7 accelerates. From the main nozzle 7, the weft thread S by the shed formed by warp K and open shed along the Weft insertion 4 entered. Along the weft insertion path 4 are usually even more auxiliary or relay nozzles 10 arranged, which support the entry of the weft S through the shed and lead the weft S. After the weft insertion hits a Web loading 9 the weft S to the fabric G on. Then there is a Tray change, that is, the warp K are crossed, so that the Registered weft S over the entire weaving width in the fabric G is involved. Subsequently, the just entered weft thread S with a cutter 11 on the catcher side 3 and with another Cutting device 11 'cut on the weft side 2, so that a new Thread start is ready for the next weft insertion.

On the weft and / or catcher side 2 or 3 can also deposit 12 ' or 12 may be provided which the ends of the registered Weft S after cutting and after a change of subject bend over and insert into the next open compartment, as shown in FIG. 1 is shown schematically. In this way, can be proper Produce fabric edges 13,13 '. The depositors 12,12 'can be used as air inlets be configured, which hold the thread ends by means of air and bend. This is indicated in FIG. 1 by the arrows L on the inserts 12, 12 '.

According to the invention, a monitoring device 20 is located on the catching side 3 provided for monitoring and handling of the catcher side Weft tips or ends is used. The monitoring device 20 can also be used to monitor and handle faulty Weft threads and their disposal serve.

The monitoring device 20 comprises two sensor devices 21, 22 for detecting the weft thread S or parts of the weft thread S. According to the invention of these two sensor devices 21,22 on the Fangseite 3 only one, namely the following as a firefighter designated sensor device 21 fixedly mounted on the sley 9, so the firing guard 21 is stationary with respect to the sley 9 and whose participates in oscillatory motion.

The second sensor device 22, hereinafter referred to as tube monitor 22 is referred to in the back even more explained manner in a Extraction device 30 integrated, which is part of the Monitoring device 20 is, and the suction of pieces of thread or Yarn remains serves.

The firing monitor 21 is in the embodiment shown here arranged directly at the catch end of the weft insertion path 4 and Detects the weft tip as soon as the shed at the end of the Weft insertion 4 leaves. As a firefighter 21 everyone is suitable known sensor, with which the weft thread is detectable, for example, an electrostatic or an optical sensor.

The monitoring device 20 further comprises a catching device 40, the seen in the firing direction behind the firefighter 21 firmly on the Web loading 9 is arranged and therefore synchronously with the sley 9 emotional. The catcher 40 serves to hold and stretch the registered weft thread and includes a in weft direction A extending and continuous channel 41, a catch tube 42 and a Catching nozzle 43. The catching device 40 is mounted on the sley 9, that the continuous channel 41 is aligned with the weft insertion path 4, that is the channel 41 extends in the extension of the weft insertion path 4th The catching nozzle 43 and the catching pipe 42 are arranged relative to each other so that by applying the catching nozzle 43 with the fluid - here the air - the tip of the inserted weft thread in the catch tube 42 deflected is.

Especially with stiffer weft threads S, it is advantageous if the Catch tube 42 is arranged so that it is inclined at an acute angle α into the channel 41 and thus in the weft direction A opens. On the one hand is it is desirable to the registered and from the catcher 40 to to keep deflecting weft S from the weft direction A, so by increasing the friction forces a higher holding force on the Exercise weft, on the other hand, it is particularly resistant to bending Weft threads difficult or unfavorable, the weft S in the Catcher 40 rectangular or even obtuse from the Distract the firing direction A. Practice has shown that especially at stiff weft threads of the angle α is preferably 30 ° to 70 °.

The catching nozzle 43 is preferably a pressure nozzle or blowing nozzle, which with Compressed air is applied, as indicated by the arrow L in Fig. 1. The Muzzle 43 opens into the channel 41 and is aligned so that the Air jet emitted from the catching nozzle 43 is substantially the same Direction extends as the catch tube 42 and the mouth of the catch tube 42nd in the channel 41 meets.

The monitoring device 20 further comprises a suction device 30, stationary with respect to the machine frame of the jet loom 1 is arranged. The suction device 30 is on the catching side 3 in essentially in extension of the weft insertion 4 outside the Batten 9 mounted. The suction device 30 comprises an inlet funnel 31 and an adjoining suction pipe 32. The inlet funnel 31 is located at the same height level as the trailing end of the Weft insertion path 4 in such a way that it moves in the direction of Catcher 40 opens. Regarding its lateral extent in the Inlet hopper 31 preferably designed so that it covers the entire Amplitude of the oscillating movement of the catch end of the Weft insertion path 4 covers. During operation, so moves one rectilinear extension of the weft insertion 4 always within the Inlet funnel 31.

The inlet funnel 31 merges into the suction tube 32, which is in Weft direction A extends. Integrated into the suction tube 32 is the second Sensor device 22, namely the pipe monitor 22. Darstellungsgemäss the pipe monitor 22 in the end facing away from the inlet funnel 31 the suction pipe 31 is arranged. As a pipe guard 22, each is suitable known sensor device for detecting the weft thread or of parts of the weft thread is suitable, in particular electrostatic or optical sensors.

At the suction pipe 32 is followed by a flexible discharge line 33, through which extracted threads or thread parts to a disposal container 50th reach.

As the arrow U indicates symbolically, during operation in the Suction device 30 generates a vacuum for sucking the thread parts.

In a preferred embodiment, the suction device 30 comprises a Disposal nozzle 34, preferably seen in the weft direction immediately before the pipe monitor 22 opens into the suction pipe 32. The Disposal nozzle 34 is designed as a blowing nozzle and with air acted upon, as indicated by the arrow L in Fig. 1. advantageously, the disposal nozzle 34 is arranged so that the emitted from it Air jet runs obliquely to the axis of the suction tube. This blows the Disposal nozzle 34 a passing thread obliquely on the Pipe monitor 22 too. In the case of an electrostatic tube monitor 22 This results in a significantly better charge transfer from the thread the pipe monitor 22, whereby the detection is improved.

It has been shown that an application of compressed air to the thread an increase in its static charge leads. Therefore, it is beneficial to the Disposal nozzle 34 immediately before the pipe monitor 22 to arrange, because thus by the compressed air pulse immediately in front of the pipe monitor the static charge of the thread to be detected is increased.

Immediately before the pipe monitor 22 opens an inlet 35 in the Suction tube 32. The inlet 35 opens obliquely into the suction tube 32, approximately the same axial position of the suction tube 32, on which also the Disposal nozzle 34 opens. In the illustrated here Embodiment are the disposal nozzle 34 and the inlet 35 in substantially symmetrical with respect to the axis of the suction tube 32 arranged.

A flexible connecting line 36 connects the outlet of the catching pipe 42 the catcher 40 with the inlet 35 of the suction device 30th

During operation of the jet loom, the Monitoring device 20 as follows:

In normal operation, a predetermined thread length of the Winding drum, the weft S accelerated by the main nozzle 7 and entered through the open shed along the weft insertion path 4. The tip of the weft yarn 3 happens when leaving the shed the Fangseite the shotguard 21 and is detected by this. thereupon the tip of the weft thread enters the channel 41 of the catcher 40. There, the catching nozzle 43 blows the tip of the weft thread S by means of a Air jet in the catch tube 42, where it is held. Does the weft S? the correct length, so its tip is after completion of the Entry at any point between the entrance to the Catcher 40 and the pipe monitor 22, as shown in Fig. 1 for the Weft S is shown as an example. In the further course of the weave cycle beats the sley 9 the registered weft S to the Tissue edge, the tray change occurs, causing the weft over the entire tissue width is incorporated into the tissue.

During striking by the sley 9, the weft S on the firing side 2 and on the catching side 3 respectively in the depositors 12 'and 12 respectively eingerführt.

After the change of subject the registered and now integrated Weft S on the catcher side 3 and on the firing side 2 by means of Cutting device 11 or 11 'cut. The catching thread rest R is sucked and passes through the flexible connecting line 36 and the Inlet 35 into the suction tube 32, happens - as shown in Fig. 1 - the Pipe monitor 22, triggers a signal there and finally passes through the Outlet line 33 to the disposal container 50th

It is possible that the thread tip of a correctly entered shot despite activation of the catching nozzle 43 does not get into the catching pipe 42, but straight in the channel 41 is stretched. After the catch-side cutting of such weft yarn, the weft remainder R of the Inlet hopper 31 is sucked off and so passes the pipe guard 22 over in the discharge line 33. This usually does not lead to an error message.

After the change of subject are in the inserts 12, 12 'located Thread ends bent and inserted into the newly opened shed.

During web operation, the correct weft insertion is determined by the two sensor devices 21, 22 checked. These are the Sensor devices with an evaluation and not shown Control unit signal bound.

For a correct weft insertion, the weft tip must the Gunner 21 within a known first time interval - related on the weave cycle - happen. After cutting, the thread remains R the pipe monitor during a known second time interval - related on the weave cycle - happen. Both time intervals correspond to one Angular interwall of the main shaft of the weaving machine. In this context So it does not matter if you think of a time interval or one Angular interval speaks.

As a criterion for a correct weft insertion, for example, the used during the first time interval has the Gunner 21 detected a thread and outside the second Interval, the pipe monitor 22 has detected no thread.

In this way, the monitoring device 20 operates during the correct weft insertion. A significant advantage over known It is devices that also with each correct weft insertion of the Thread residue R passes through the pipe guard 22. This will become one Pollution of the pipe monitor 22 counteracted efficiently because the Thread residues R Always clean the pipe guard.

As long as the weft entries are made without errors, the disposal nozzle 34 usually inactive.

The following is now in a non-conclusive manner, the detection possible error during weft insertion briefly explained:

In a so-called long shot is too much thread of the Winding drum deducted, z. B. one winding too much. Although the Gunner 21 nor the signal that the weft tip is correct within the first time interval, but the pipe guard 22 reports an arrival of the weft thread outside the second interval. There in such a long shot, both sensor devices overlap one another Give signal, the long shot is easily detectable. In general leads a long shot not to stop the loom. The thread length can however, be changed for the next shots.

Furthermore, it is possible that a piece of the weft thread is torn off. This then flies through the channel 41 of the catcher 40 and is of aspirated the inlet hopper 41 of the suction. Depending on where or when the weft yarn breaks, the shotgun 21 registers and / or the pipe guard 22 then that outside the first and / or second Interval the arrival of a thread was detected.

In a so-called stop-shot breaks the weft yarn during braking. In such a case, the gunner 21 usually registers the correct arrival of the weft tip in the first time interval, but the Pipe monitor registers the arrival of a thread outside the second Time interval, too early.

If the shotgun 21 until the end of the first time interval no Arrival of a weft registered, so is certainly a mistake in the Weft insertion occurred, for example, the weft thread between to have stuck to the warp threads.

Depending on the occurring error during weft insertion, methods are known using automatic procedures to repair the error that has occurred or to eliminate the faulty shot. Also for such automatic Procedures for weft repair is the monitoring device 20 the inventive jet loom 1 suitable. The following will be such an automatic procedure by way of example with reference to FIG. 2 explained.

It is assumed that the gunner 21 until the end of the first time interval no arrival of the weft thread S has detected. Of the Weft is stuck in the shed.

The firing monitor 21 does not detect arrival of a thread tip. The Weaving machine is braked. Although there is usually still a stop, but the cutters 11, 11 'are deactivated so that no Cutting, especially shot side, of the faulty registered Weft S is done. The shed opens. Now it is from the Yarn stopper 61 on the winding drum 6 a predetermined thread length released, for example, one or two windings. This thread length is blown as a loop D or double loop through the shed. The Double loop D is shown in Fig. 2 by dashed lines. Through a accordingly activation of the relay nozzles 10 is in the shed Wanderfeld generated, so that the loop wanders through the shed and thereby causing a detachment of the damaged defective weft thread. The catching nozzle 43 of the catching device 40 is not activated. Thus arrived the weft thread through the inlet funnel 31 in the region of Pipe monitor 22 in the designated in Fig. 2 with E position. The pipe guard 22 detects the arrival of the weft. The disposal nozzle 34 is activates and acts on the weft thread with a compressed air jet. Of the Weft is shot side by means of the cutting device 11 ' cut. The disposal nozzle 34 generates an additional tensile force, the helps to remove the incorrectly inserted weft thread from the tray. The successful completion of the shooting troubleshooting can be done recognize that the pipe monitor 22 no longer detects a thread. Then the faulty weft yarn overall in the disposal container 50th sucked or blown out. The weaving process can continue become. For comparison, Fig. 2 shows the position in a solid line a correctly entered weft S.

If the pipe monitor 22 operates according to an electrostatic principle, comes the disposal nozzle 34 in addition to the function of detachment and the Extracting the faulty weft inserted nor the function to, through the air jet emitted by it an amplification of the static Charging the thread to make it more detectable. Further, the obliquely to the firing direction A exiting jet directs to disposing thread towards the periphery of the suction tube 32, so that the thread transfers its load more efficiently to the pipe monitor can.

The monitoring device 20 of the inventive Jet loom 1 has the advantage that the pipe monitor 22 both in normal weaving as well as procedures for weft troubleshooting is used. Compared to known devices so no additional sensor needed for the shotgun repair. Thus can be save a sensor. Furthermore, the pipe monitor 22 is at each Weft insertion of a thread residue R happens. This has a permanent one Cleaning effect result because the thread residues R dirt on the Remove the pipe monitor. This increases the reliability of the sensor device and with it the reliability of the monitoring.

FIG. 3 shows a variant for the monitoring device 20. The Reference numerals have the same meaning already in connection was explained with Fig. 1. The variant shown in Fig. 3 differs The fact that means are provided to the distance between the Sensor device on the batten, so the shotgun 21, and the Pipe monitor 22 to change. These means include, for example Sliding sleeve 37, which is arranged so that the inlet funnel 31 relative to the pipe monitor 22 in the firing direction A is displaceable. The Connecting line 36 is adaptable with respect to its length. Thus, the Distance between the gunner 21 and the pipe guard 22 variable. For example, by changing this distance determine how long a weft should be maximum before he than Long shot is assessed or detected.

Fig. 4 shows a longitudinal section through the suction tube 32 in the region of Pipe monitor 22. The longitudinal axis of the suction tube 32 is designated C. The inner contour 221 of the tube monitor 22 is here designed so that they is formed flush with respect to the inner wall 321 of the suction tube 32. Of course, other configurations are possible in this regard. So can the inner contour 221 with respect to the inner wall 321 also protruding or to be back. Except the darsteillungsgemäss essentially cylindrical shape of the inner contour 321, are also concave or convex Training possible.

In the following, two more will now be described with reference to FIGS. 5 and 6 preferred variants for the suction device 30 explained. It will only to the differences from the previously described embodiment received. Otherwise, the explanations in FIGS. 1-4 apply illustrated embodiments in an analogous manner.

5 and 6 each show a cross section through the suction tube 32, whose longitudinal axis is again denoted by C. In these two variants For example, the disposal nozzle 34 and the inlet 35 are asymmetrical with respect to FIG Longitudinal axis C of the suction tube arranged. That is, the axis 35A of the Inlet 35 and the axis 34A of the disposal nozzle 34 are one Amount e1 or e2 next to the longitudinal axis C of the suction tube 32. The axes 35A and 34A thus do not intersect the longitudinal axis of the suction tube.

In the variant according to FIG. 5, the inlet 35 and the mouth of the Disposal nozzle 34 with respect to the circumferential direction of the suction tube to offset by about 180 °, in the variant of FIG. 6 by about 90 °.

In the variants shown in FIGS. 5 and 6, both the Inlet 35 and the disposal nozzle 34 arranged asymmetrically. Of course, such variants are possible in which either only the Disposal nozzle 34 or only the inlet 35 is arranged asymmetrically.

Due to the asymmetrical arrangement of the disposal nozzle 34 and / or the Inlet 35 receives the thread or the thread rest additionally a twist and rotates along the inner wall of the suction tube 32nd

Due to the oblique and asymmetrical arrangement of the inlet 35 of the already explained above cleaning effect reinforced. That by the Inlet 35 in the suction tube coming thread piece receives a twist, rotates along the inner wall of the suction tube 32, thereby cleaning the Pipe monitor 22.

In the case of an electrostatic tube guard 22 is in the asymmetrical arrangement of the inlet 35 the static charge of the Thread through the turbulence even stronger and also the charge transfer improved on the pipe guard 22.

Claims (13)

A jet weaving machine, in which a weft thread (S) can be introduced by means of a fluid from a weft side (2) to a catching side (3), with a sley (9), along which a weft insertion web (4) extends, which has a weft direction (A) determines, as well as with a on the catcher side (3) arranged monitoring device (20), which two sensor means (21,22) for detecting the weft thread (S) or parts of the weft thread, characterized in that exactly one of the sensor means (21) fixed is mounted on the batten (9). Jet loom according to claim 1 with a fixed on the sley (9) arranged catching device (40) for holding or stretching the Weft thread having a catching nozzle (43) and a catching pipe (42) includes, which are arranged relative to each other such that Impingement of the catching nozzle (43) with the fluid the tip of the Weft thread in the catch tube (42) is deflected. A jet loom according to claim 2, wherein the catcher tube (42) below an acute angle (α), preferably an angle of 30 ° to 70 °, in the weft direction (A) opens. Jet loom according to one of claims 2 or 3, wherein the Catching nozzle (43) designed as a pressure nozzle and arranged so that the jet emitted by the capture nozzle (43) is in the same direction extends like the catch tube (42). A jet loom according to any one of the preceding claims, wherein which a suction device (30) for the weft thread or for parts it is provided which stationary with respect to the machine frame is arranged on the catching side (3), and which the other of the Sensor devices (22) as a pipe monitor comprises. A jet loom according to claim 5, wherein the Suction device (30) an inlet funnel (31) and a thereto subsequent suction tube (32), wherein the inlet funnel (31) facing the catcher (40), and wherein the Pipe monitor (22) in the region of the suction pipe (32) is arranged. Jet loom according to claim 5 or 6 with a flexible Connecting line (36), which on one side with the catch tube (42) and on the other hand with an inlet (35), which in the suction device (30), preferably into the suction tube (32), opens. A jet loom according to any one of claims 4-7, wherein the Suction device (30) acted upon by the fluid Disposal nozzle (34), seen in the weft direction (A) is arranged immediately in front of the pipe monitor (22). A jet loom according to claim 8, wherein the disposal nozzle (34) is arranged on or in the suction tube (32), that of the Disposal nozzle (34) emitted jet of fluid obliquely to the axis of the Extraction tube (32) extends. A jet loom according to claim 8 or 9, wherein the Disposal nozzle (34) and / or the inlet (35) asymmetric is arranged with respect to the longitudinal axis C of the suction tube. A jet loom according to any one of claims 8 to 10, wherein the pipe monitor (22) comprises an electrostatic sensor, and in which the disposal nozzle (34) is arranged such that the of the discharge nozzle (34) emitted jet of fluid the static Increased charge of the thread and distracted the thread so that he his Charge to the electrostatic sensor. A jet loom according to any one of claims 8 to 11, wherein the pipe monitor (22) comprises an optical sensor, and in which the inlet (35) is arranged in the suction device (30) in such a way that that during normal operation, that of the capture device (40) caught thread residues R constantly clean the optical sensor. A jet loom according to any one of the preceding claims, wherein which means (37) are provided to adjust the distance between the Sensor device (21) on the batten and the pipe monitor (22) change.

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