JP2008190108A - Method and apparatus for insertion of weft thread in weaving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control an insertional speed by measuring the speed in contact-free manner. <P>SOLUTION: The speed of the weft thread in contact-free manner is measured by means of one or more measuring pickups 7.1-7.3 without contact. In the method at least one of the measurement pickups is formed for multiple measurement within the weft insertion and is arranged at or after a first acceleration nozzle 3. Furthermore, measured values are measured in contact-free manner a plurality of times during the weft insertion by means of the at least one measurement pickup (not illustrated) from which values for the speed and/or the path traveled by the weft thread are determined during the weft insertion; and the values determined during the weft insertion are used for the control of the weft insertion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for inserting a weft thread into a loom, and more particularly to a loom shed according to the preamble of each of claims 1 and 6, and to be equipped with such a process. More particularly, the present invention relates to an air jet loom.

  In the insertion of the weft yarn into the air jet loom, the yarn drawn from the yarn reservoir is accelerated by an acceleration nozzle, mainly called main nozzle and tandem nozzle, inserted into the shed, where it is further transported by so-called auxiliary or relay nozzles. Is done. In a typical air jet loom, the relay nozzle is switched on and off with a fixed and preselected profile in relation to the rotation of the machine spindle.

  EP0554222A1 includes a plurality of weft monitors arranged in the shed to detect the time when a plurality of auxiliary nozzles and the front end of the weft thread inserted at one position of the weft monitor are entered. A method for adjusting the weft insertion for an air jet loom with a knives is described. In this described method, the time point detected is compared with a preset reference arrival time, and the pressure of the blown compressed air for the auxiliary nozzle or group of auxiliary nozzles arranged before and after this time interval and / or weft monitor. Is changed based on the comparison between the desired value and the actual value.

  The method described in EP 0554222A1 is relatively complex because it requires the supply of compressed air with different airflow rates for the auxiliary nozzles. Simultaneous activation of several groups of auxiliary nozzles is also disadvantageous because it is associated with a large increase in compressed air consumption. In addition, the placement of multiple weft monitors in the shed is also problematic because they can damage the warp and thereby impair the quality of the fabric.

  In WO 92/04490, a weft insertion system for an air jet loom is controlled in which the weft is wound on a drum reservoir and the length withdrawn is continuously measured in a non-contact manner during the weft withdrawal using a so-called rotation counter. A method is described. The approximation of the position of the front end of the weft thread in the shed is obtained from the rotation counter signal and serves to control the air nozzle or thread brake used for inserting the weft thread. In the method described, the approximate value obtained for the position of the weft end using the rotation counter signal is further compared with the arrival time obtained using the weft monitor at the catch end of the shed. This deviation is then used to calculate a corrected approximation for subsequent weft insertion.

  An approximation of the position of the weft tip determined using the method of WO 92/04490 is that the weft is sometimes withdrawn irregularly from the drum reservoir, in which, by way of example, at a specific position of the weft tip in the shed. On the other hand, it is quite inaccurate because 3 turns are drawn and 3 and a half are drawn for the next weft insertion at the same position. Furthermore, with subsequent weft insertion, weft tension and elongation may change. For the reasons mentioned, the control of weft insertion while using a corrected approximation to the position of the weft tip is rather inaccurate.

  The object of the present invention is described in WO 92/04490, in which a measurement pickup operating in a non-contacting manner is used, without risking the quality of the fabric by means of a plurality of weft monitors arranged in the shed. Method and apparatus for inserting a weft thread in a loom, in particular an air jet loom's shed, in which a more accurate value compared to the method can be determined for the path of the weft thread movement or for the speed of the weft thread Is to make it available. Another object of the invention is to make available a loom, in particular an air jet loom, for carrying out such a method and having such a device.

  This object is met according to the invention by a method as defined in claim 1 and by an apparatus as defined in claim 6 and an air jet loom as defined in claim 11.

  In the method of the present invention for inserting a weft thread into a shed of a loom having a yarn reservoir and a transfer device, the weft thread is inserted into the shed using a transfer device. In the case of an air jet loom, the transfer device includes at least one acceleration nozzle and a plurality of auxiliary nozzles, and the weft yarn drawn from the yarn reservoir is accelerated using at least one auxiliary nozzle into the shed. Supplied and further transported through the shed using an auxiliary nozzle. Furthermore, measured values that vary depending on the speed of the weft and / or the path along which the weft travels are measured in a non-contact manner using one or more measuring pickups. In this method, at least one measurement pickup, referred to below as a special measurement pickup, is additionally designed for multiple or continuous measurements during weft insertion (meaning one weft insertion step prior to the next step) A first following the yarn reservoir at the yarn centering device provided at the outlet of the vessel or behind the outlet, or at or behind the yarn brake provided separately from the yarn reservoir. Located at or behind the acceleration nozzle. During the weft insertion, the measured values are measured several times or continuously without contact using this at least one special measurement pickup, from which the speed of the weft and / or the path through which the weft travels and / or the weft Values for speed and / or parameters linked to the path the weft travels are determined during weft insertion. For continuous measurement during weft insertion, a measurement pickup that delivers an analog output signal can be used, for example. Furthermore, the values determined during the weft insertion are used for the adjustment and / or control of the weft insertion, preferably the current weft insertion, for example in which the yarn brake is controlled and / or therein. At which the acceleration and / or auxiliary nozzle switching times of the air jet loom are controlled and / or the pressure supplied to the nozzle, for example by deviation of the measured speed profile from the desired profile Is changed.

  In one advantageous variant, the measured values, which vary depending on the speed of the weft and / or the path along which the weft travels, are not measured during one weft insertion or during part of the weft insertion using this at least one special measurement pickup. The contact is measured at least 50 times, or at least 200 times, or at least 500 times. In another advantageous variant, the measured values that vary depending on the speed of the weft and / or the path along which the weft travels are continuously measured during the weft insertion or during a part of the weft insertion using this at least one special measurement pickup. Or at least every 0.5 ms, or at least every 0.2 ms, or at least every 0.05 ms.

  This at least one special measurement pickup can operate with the second measurement pickup, for example according to laser interferometry, laser Doppler method, according to spatial filter method or according to correlation method.

  In an advantageous embodiment, the at least one special measuring pickup is between the yarn centering device and the yarn brake, or between the yarn brake and the first acceleration nozzle, or between the first acceleration nozzle and the end of the shed. Between the first acceleration nozzle and the second acceleration nozzle, or between the last acceleration nozzle and the shed in the weft insertion direction, or at the entrance to the shed, for example Or it is arranged at the place.

  An apparatus according to the invention for inserting a weft thread into a loom's shed comprises a yarn reservoir, a transfer device for inserting the weft thread into the shed and one or more measuring pickups. In the case of an air jet loom, the transfer device accelerates the weft drawn from the yarn reservoir and supplies at least one acceleration nozzle for supplying it to the shed and a plurality of knitting yarns for further transferring in the shed. Includes an auxiliary nozzle. In this device, at least one measurement pickup, hereinafter referred to as a special measurement pickup, measures several times or continuously during non-contacting insertion of the weft thread, which varies depending on the speed of the weft thread and / or the path along which the weft thread travels At the outlet of the yarn reservoir or behind the yarn centering device provided behind the outlet or separately from the yarn reservoir. At or behind the thread brake, or at or behind the first acceleration nozzle following the thread reservoir. For example, a measurement pickup can be provided that delivers an analog output signal for continuous measurement during weft insertion. This device is based on the measured value using this at least one special measuring pickup during weft insertion, with respect to the speed of the weft and / or the path along which the weft travels and / or the weft and / or weft travel Including an evaluation part for determining values for the parameters linked to the path to be adjusted and a control part for adjusting and / or controlling the weft insertion, in particular the current weft insertion using the values determined during the weft insertion. E.g. in which the yarn brake is controlled and / or the acceleration and / or auxiliary nozzles are switched on and off at the air jet loom and / or measured speed, for example Deviations of the profile from the desired profile change the pressure supplied to the nozzle. If necessary, this evaluation part can be integrated into the control part.

  In an advantageous variant, the at least one special measurement pickup is adapted to measure at least 50 times during one weft insertion or during a portion of the weft insertion, depending on the speed of the weft and / or the path the weft travels. , Or at least 200 times, or at least 500 times without contact. Measurements of the kind mentioned can be advantageously measured continuously and without contact during the weft insertion or during a part of the weft insertion using this at least one special measurement pickup. In another advantageous variant, the at least one special measurement pick-up measures at least every 0.5 ms during the weft insertion or during a portion of the weft insertion, depending on the speed of the weft and / or the path the weft travels. Or at least every 0.2 ms, or at least every 0.05 ms.

  This at least one special measurement pickup is advantageously a pickup operating according to the laser interferometry, laser Doppler method or according to the spatial filter method, or a measurement pickup operating with the second measurement pickup according to the correlation method.

  In an advantageous embodiment, the at least one special measuring pickup is between the yarn centering device and the yarn brake, or between the yarn brake and the first acceleration nozzle, or between the first acceleration nozzle and the end of the shed. Between the first or second acceleration nozzle or between the last acceleration nozzle and the shed in the weft insertion direction or at the entrance to the shed .

  Furthermore, the invention is equipped to carry out a method according to one of the embodiments and variants described above and / or an apparatus according to one of the embodiments and variants described above. Includes looms, particularly air jet looms.

  The method and apparatus according to the invention, and also the looms according to the invention, in particular the air jet loom, are specially measured behind the yarn centering device following the yarn reservoir, or at or behind the yarn brake or first acceleration nozzle. Thanks to the arrangement of the pick-up, irregularities in the withdrawal of the weft yarn from the yarn reservoir are no longer important and the distance between the weft tip and the measuring position is reduced compared to the measurement at the yarn reservoir. So that the influence of yarn tension and yarn elongation on the measurement is reduced, so that at the previous yarn reservoir, for the speed of the weft yarn and / or for the path the weft yarn travels and / or for the parameters linked thereto, This has the advantage that a more accurate value can be used during weft insertion than can be determined using a rotation counter. In addition, the weft thread is generally stretched behind the insertion thread brake or the first accelerating nozzle, which is likewise effective for measuring accuracy.

  The method and apparatus according to the present invention, as compared to the conventional method where the point in time when the front end of the inserted weft thread arrives at the position of the weft monitor is determined using a weft monitor placed in the shed, and The looms of the present invention, in particular the air jet looms, also have the advantage that there is no danger of warp yarn being damaged during the spout replacement. Furthermore, thanks to special measurement pickups that measure multiple times or continuously during weft insertion, values for the weft speed and / or the path along which the weft travels are possible with a limited number of weft monitors in the shed. It can be determined at shorter time intervals or continuously than it is. As a result, it becomes possible to more quickly detect a failure caused by insertion of a weft yarn such as a weft yarn breakage.

  For the speed of the weft and / or the path through which the weft travels, which is available continuously or at shorter time intervals and is required during weft insertion using the method, apparatus and loom according to the invention, in particular an air jet loom And / or as a result of values for parameters linked to the speed of the weft and / or the path along which the weft travels, the individual weft yarn (weft, eg preset speed profile, total time of flight or point of use of the brake) It is possible to more accurately match the weft insertion and / or react more quickly to failure to the desired parameters specified for a problem weft insertion for yarn). For weft insertion, for example, a closing adjustment circuit can be provided to control individual desired parameters during weft insertion. This value, determined continuously or at short time intervals, allows adjustment and / or control of the current weft insertion while keeping the time constant and / or delay for adjustment relatively small.

  The above description of the embodiments serves merely as an example. Further advantageous embodiments can be taken from the dependent claims and the drawings. Furthermore, the individual features from the embodiments and variants described and illustrated can be combined with one another to form new embodiments within the context of the invention.

  In the following, the present invention will be described in more detail with reference to examples and drawings.

  FIG. 1 shows an embodiment of an air jet loom 1 having a device according to the invention. This device for the insertion of the weft thread 2 into the shed (not shown in FIG. 1) accelerates the weft thread drawn from the thread reservoir 21, which can include, for example, a storage drum 22, 4. at least one acceleration nozzle 3, 4 for feeding to the shed, a plurality of acceleration nozzles 5.1a-c for further transferring the weft yarn into the shed. na to c and, for example, one or more rotation counters 7 arranged at or near the yarn reservoir 21 to detect the rotation speed or partial rotation speed of the pull from the storage drum 22 One or more measurement pickups 7, such as a weft monitor 17 arranged at the catch end of the shed to detect the arrival of .1, 7.2 and / or the inserted weft 2 .1, 7.2, 17 are included.

  In the device according to the invention, at least one measurement pickup, referred to hereinafter as special measurement pickup 6, is designed for multiple or continuous measurements during weft insertion, is non-contact during weft insertion, the speed of the weft and / or Or a yarn centering device 23 provided at or behind the outlet of the yarn reservoir 21 in order to make it possible to measure measurements that vary depending on the path the weft thread travels in multiple or consecutive times. 1 or at the back of the yarn brake 9 provided separately from the yarn reservoir 21 or behind it, or at the first acceleration nozzle 3 following the yarn reservoir 21 as shown in FIG. Or it is provided behind it. For example, a measurement pickup can be provided that delivers an analog output signal for continuous measurement during weft insertion. The device further includes the speed of the weft and / or the path along which the weft travels and / or the speed of the weft and / or the weft move from the measured value using at least one special measurement pickup during the weft insertion. An evaluation part for determining values for parameters linked to the path, and a control part 10 for adjusting and / or controlling the weft insertion, in particular the current weft insertion, using the values determined during the weft insertion. E.g. in which the yarn brake is controlled and / or the time for switching on and off of the acceleration nozzle and / or auxiliary nozzle of the air jet loom is controlled and / or measured e.g. Based on the deviation of the velocity profile from the desired profile, the pressure supplied to the nozzle is changed. This control part is sometimes the evaluation part and / or the measurement pickups 6, 7.1, 7.2, 17 and / or the acceleration nozzles 3, 4 and the auxiliary nozzles 5.1a-c to 5.c. connected to the compressed air supply of na-c. If necessary, this evaluation part can be integrated in the control part 10.

  In this embodiment, the accelerating nozzle includes a main nozzle 3 and a tandem nozzle 4 to which compressed air is supplied via control valves 13 and 14 that are electromagnetic valves, for example. A single main nozzle can be provided at the main and tandem nozzles 3 and 4 to accelerate the weft, or a plurality of main nozzles, often referred to as pre-nozzles and main nozzles, can be arranged in series. Of course, a plurality of main nozzles 3 lying side by side or on top of each other can be provided for alternately inserting different weft yarns 2 which can differ in color, fineness, weave and material. This auxiliary nozzle 5.1a-c to 5. na to c can be supplied individually with compressed air or, for example, control valves 15.1 to 15.5 which are solenoid valves. It can be combined into groups of 2 to 5 or more nozzles, each having a group of nozzles fed together with compressed air via n. This control valve 15.1 to 15. n is expediently connected via a pressure line 11 to a compressed air reservoir and / or a compressed air distributor 12 to which compressed air is supplied. A plurality of compressed air reservoirs and / or distributors 12 that can have different pressure levels can also be provided.

  If necessary, the device can include a thread brake 9 controlled by the controller 10. The weft thread 2 can be braked by using the thread brake 9 at the end of the weft thread insertion, for example, at the end of the weft thread insertion when the weft thread tip approaches the catch side end of the shed. Furthermore, if necessary, the device can include a yarn centering device 23 which is arranged at or behind the outlet of the yarn reservoir 21, as shown in FIG.

  In an advantageous variant, this at least one special measurement pickup 6 measures at least 50 times, or at least 200 times, or at least 500 during the weft insertion, depending on the speed of the weft and / or the path along which the weft travels. Suitable for non-contact measurement. Measurements of the kind mentioned can be advantageously measured in a non-contact manner during the weft insertion or in a sequential order during a portion of the weft insertion using this at least one special measurement pickup. In another advantageous variant, the at least one special measurement pickup 6 continuously measures the values that vary depending on the speed of the weft and / or the path along which the weft travels during the weft insertion or during a part of the weft insertion. Or suitable for non-contact measurements at least every 0.5 ms, or at least every 0.2 ms, or at least every 0.05 ms.

  This at least one special measurement pickup is advantageously a measurement pickup operating according to laser interferometry, laser Doppler method or according to spatial filter method, or measurement pickup operating with a second measurement pickup according to correlation method. . For the spatial filter method, optical processes are known, for example both the method described in DE 4307530 A1 using a line grid and the electrostatic method for evaluating the influence of the charge on the running yarn. A method of this kind in which the yarn passes through an electrostatic pickup with periodic spatial sensitivity is described, for example, in EP 10333579 A2. In the correlation method, in each case, the signals of two pickups spaced along the yarn are evaluated, and the speed of the yarn is determined by the optical and electrostatic properties determined from the pickup interval and the time transition of the two signals. Similar methods are known as well. This type of electrostatic method is described, for example, in GB 1249610. A suitable electrostatic pickup for the correlation method is described, for example, in DE4408312A1.

  In an advantageous embodiment, at least one special measuring pickup 6 is arranged between the first acceleration nozzle 3 and the second acceleration nozzle 4 as shown in FIG. However, it is between the yarn centering device 23 and the yarn brake 9, or between the yarn brake 9 and the first acceleration nozzle 3, or between the first acceleration nozzle 3 and the end of the shed, or the weft insertion. It can also be arranged between the last acceleration nozzle 4 in the direction and the shed, or on the inlet side of the shed, for example on a sley or shed 8 of an air jet loom.

  As shown in FIG. 1, the air jet loom 1 can include a rivet 8 for beating the inserted weft yarn 2, and each cut on both sides of the shed to separate the weft yarn after beating. Can have equipment. In addition, an extension nozzle and / or a catch nozzle 16 may be provided at the catch side end of the shed to stretch the inserted weft thread prior to beating and / or to remove the weft thread end after being cut off. it can.

  FIG. 2 shows another embodiment of the device 20 according to the invention. Only those components that are in direct contact with the weft thread 2 and / or accelerate, transfer or brake and / or detect the weft thread are shown in the schematic diagram. The individual components of this embodiment have already been described in the context of the embodiment of FIG. 1 except for the yarn centering device 23, the measurement pickups 6.1 to 6.5 and the fabric width 18. Reference numerals for the individual components of FIG. 1 have been retained in the embodiment of FIG.

  In the embodiment shown in FIG. 2, at least one measurement pickup, referred to below as special measurement pickup 6.1-6.5, is designed for multiple or continuous measurements during weft insertion, and the weft speed and Behind the yarn centering device provided at or behind the outlet of the yarn reservoir 21 in order to measure, in a non-contact manner, a number of times or in succession, which varies depending on the path the weft thread travels Or at or behind the yarn brake 9 provided separately from the yarn reservoir 21 and at or behind the first acceleration nozzle 3 following the yarn reservoir 21. For example, a measurement pickup can be provided that delivers an analog output signal for continuous measurement during weft insertion. In an advantageous embodiment, this at least one special measuring pickup 6.1 to 6.5 is arranged between the yarn centering device 23 and the yarn brake 9 or between the yarn brake 9 and the first acceleration nozzle 3 (measuring pickup). 6.1), or between the first acceleration nozzle 3 and the second acceleration nozzle 4 (measurement pickup 6.2), or between the first acceleration nozzle 3 and the end of the mouth (measurement pickup 6). .2 to 6.5), or between the last acceleration nozzle 4 and the shed in the weft insertion direction (measurement pickups 6.3, 6.4), or at the entrance to the shed (measurement pickup 6). .4), or also on the sley or ridge 8 of the air jet loom 1 (measurement pickups 6.4 and 6.5), for example, between two cloth woven fabrics (measurement pickup 6.5) . FIG. 2 shows that the special measurement pickups 6.1 to 6.5 shown are optional, in particular optional for the arrangement of special measurement pickups or special measurement pickups, i.e. 1 if necessary. It will be understood that one or more special measurement pickups can be provided in the device 20.

  If required, the apparatus of the embodiment of FIG. 2 can include a yarn centering device 23 for centering the weft yarn 2 after it has been withdrawn from the storage drum 22. Furthermore, the cloth width 18 is normally set within the cloth width from the auxiliary nozzles 5.1a to 5.1c. It is depicted in FIG. Sometimes, the fabric width 18 can include one or more fabric bands.

  The variants described in the context of the embodiment of FIG. 1 can of course be transferred to the embodiment shown in FIG.

  One embodiment of the method of the present invention for inserting a weft thread into an air jet loom's shed is described below with reference to FIGS. In this embodiment, the air jet loom 1 includes a yarn reservoir 21, at least one acceleration nozzle 3, 4 and a plurality of auxiliary nozzles 5.1a to 5.c. including na-c. In the mentioned method, the weft drawn from the yarn reservoir 21 is accelerated using at least one acceleration nozzle 3, 4 and fed to the shed, which weft passes through the auxiliary nozzles 5.1a- c to 5. Further transport using na-c. Furthermore, measured values that vary depending on the speed of the weft yarn 2 and / or the path along which the weft yarn travels are not Measured on contact.

  In said method, at least one measurement pickup, referred to below as special measurement pickup 6, 6.1-6.5, is additionally designed for multiple or continuous measurements during weft insertion, A first after the yarn centering device 23 provided at the outlet or behind the outlet, or at or behind the yarn brake provided separately from the yarn reservoir 21 or following the yarn reservoir. Is provided at or behind the acceleration nozzle 3. During the weft insertion, the measured values are measured a number of times or continuously without contact using at least one special measuring pickup 6, 6.1-6.5, from which the speed of the weft 2 and / or the weft is determined. The values for the parameters that link the moving path and / or the speed of the weft 2 and / or the path that the weft moves are determined during the weft insertion. Furthermore, the values determined during the weft insertion are advantageously used during the current weft insertion for adjusting and / or controlling the weft insertion, for example in which the yarn brake is controlled and / or Or the time of switching on or off the acceleration nozzle and / or auxiliary nozzle in the air jet loom is controlled and / or supplied to the nozzle, for example depending on the deviation of the measured speed profile from the desired profile The pressure is changed.

  In an advantageous variant of this method, the measured value, which varies depending on the speed of the weft yarn 2 and / or the path along which the weft yarn 2 travels, is obtained using this at least one special measurement pickup 6, 6.1-6.5. Measured at least 50 times, or at least 200 times, or at least 500 times without insertion during insertion or during a portion of the weft insertion. In another advantageous variant, the measurement value, which depends on the speed of the weft and / or the path along which the weft travels, is used during weft insertion using this at least one special measurement pickup 6, 6.1-6.5, Or during a portion of the weft insertion, measured at least every 0.5 ms, or at least every 0.2 ms, or at least every 0.05 ms without contact.

  This at least one special measurement pick-up 6, 6.1-6.5 can operate, for example, according to laser interferometry, laser Doppler, or according to spatial filtering, or with a suitable measurement pick-up according to correlation. Suitable special measurement pickups have been described in more detail in the context of the description of the embodiment of the device of the invention above.

  In an advantageous embodiment, this at least one special measuring pickup 6, 6.1 to 6.5 is arranged between the yarn centering device 23 and the yarn brake 9 or between the yarn brake 9 and the first acceleration nozzle 3. Or between the first accelerating nozzle 3 and the end of the shed, or between the first accelerating nozzle 3 and the second accelerating nozzle 4, or the last accelerating nozzle 4 and shed in the weft insertion direction. Or at the entrance of the shed or on the sley or ridge 8 of the air jet loom 1.

  For adjusting the weft insertion, a closed adjustment circuit can be provided, for example, to adjust individual desired parameters such as preset speed profile, total time of flight or use of brakes during weft insertion. Control deviations and / or delays in the regulation circuit are kept fairly small by values determined continuously or in short time intervals for the speed of the weft and / or the path the weft travels and / or the parameters linked to the latter Allows adjustment or control of the current weft insertion.

  The invention further comprises a loom, in particular an air jet loom, equipped to carry out the method according to the above description and / or comprising a device according to one of the variants described above.

  The method described above and the apparatus described above are suitable for all types of looms, for example air jet looms, rapier looms and projectile looms. In a rapier loom, the weft lead in the brake of the Bringer rapier prior to takeover by the taker rapier is used, for example, using the method described above or the device described above And the yarn brake provided in the device can be controlled to reduce or remove the weft lead.

  Method and apparatus for inserting a weft thread into a shed as described above, and also a loom, in particular an air jet loom, linked to the speed of the weft thread and / or the path through which the weft thread moves during the weft insertion and / or to the latter It is possible to obtain values for the parameters to be performed continuously or at short time intervals. Thanks to the values thus determined, it is possible to control and adjust the current weft insertion with a higher degree of accuracy compared to the prior art. Thus, using the described method and using the described apparatus of a weaving machine such as, for example, an air jet loom, a rapier loom and a projectile weaving machine, it is possible to more quickly detect faults, for example in weft insertion, It becomes possible to react more quickly to failures than in the previous case.

It is a figure which shows one Example of the air jet loom which has the apparatus for weft insertion by this invention. 1 is a schematic view of one embodiment of an apparatus according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air jet loom 2 Weft 3 Acceleration nozzle 4 Acceleration nozzle 5.1a-c to 5. na-c Auxiliary nozzle 6, 6.1-6.5 Special measurement pickup 7.1, 7.2, 7.3 Measurement pickup 8 ９ 9 Thread brake 10 Control part 11 Pressure line 12 Compressed air storage / distributor 13 Control valve 14 Control valve 15.1 to 15. n Control valve 17 Weft monitor 18 Cloth width 20 Weft insertion device 21 Yarn reservoir 22 Storage drum 23 Yarn centering device

Claims (11)

Weft thread (2 in the shed of an air jet loom (1) having a thread reservoir (21), at least one acceleration nozzle (3, 4) and a plurality of auxiliary nozzles (5.1a-c to 5.na-c) ), Wherein the method includes:
The weft (2) drawn from the yarn reservoir (21) is accelerated using the acceleration nozzles (3, 4) and supplied to the shed,
The weft is further transferred in the shed using auxiliary nozzles (5.1a-c to 5.na-c);
In a method in which measurements that vary depending on the speed of the weft and / or the path along which the weft travels are measured in a non-contact manner using one or more measurement pickups (7.1, 7.2, 7.3),
At least one measurement pickup, referred to below as a special measurement pickup (6, 6.1-6.5), is formed for multiple or continuous measurements during weft insertion and at the outlet of the yarn reservoir (21) At or behind the yarn centering device (23) provided behind or behind the outlet, or at or behind the yarn brake (9) provided separately from the yarn reservoir (21), or Provided at or behind the first acceleration nozzle (3) following the yarn reservoir,
During the weft insertion, measurements are measured several times or continuously in non-contact using the at least one special measurement pickup (6, 6.1-6.5), and then during the weft insertion, Values for the speed of the weft and / or the path along which the weft (2) travels and / or the speed of the weft and / or the parameters linked to the path along which the weft travels are determined,
Method according to claim 1, characterized in that the values determined during the weft insertion are used for adjustment and / or control for the weft insertion, in particular for the current weft insertion.   2. The method according to claim 1, wherein the measured value, which varies depending on the speed of the weft and / or the path along which the weft travels, uses at least one special measurement pickup (6, 6.1-6.5), The method is measured at least 50 times, or at least 200 times, or at least 500 times in a non-contact manner during the weft insertion or during a portion of the weft insertion.   3. The method according to claim 1 or 2, wherein during the weft insertion or during a part of the weft insertion, the measured value that varies depending on the speed of the weft and / or the path along which the weft travels is the at least one special item. Method using a measurement pickup (6, 6.1-6.5), measured non-contacting at least every 0.5 ms, or at least every 0.2 ms, or at least every 0.05 ms.   4. The method according to claim 1, wherein the at least one special measurement pickup (6, 6.1-6.5) is in accordance with a laser interferometry, a laser Doppler method or a spatial filter method. Or with a second measurement pickup according to a correlation method.   5. The method according to claim 1, wherein the at least one special measurement pickup (6, 6.1-6.5) comprises the yarn centering device (23) and the yarn brake (9). Between the yarn brake (9) and the first acceleration nozzle (3), between the first acceleration nozzle (3) and the end of the shed, or the first Between the accelerating nozzle (3) and the second accelerating nozzle (4), or between the last accelerating nozzle (4) and the shed in the weft insertion direction, or at the entrance to the shed Where or alternatively, the method is arranged on a sley or basket (8) of the air jet loom (1). A device for inserting a weft yarn (2) into a shed of an air jet loom (1), wherein the device (20) accelerates the weft yarn drawn from the yarn reservoir (21) and the yarn reservoir, At least one accelerating nozzle (3, 4) for supplying the shed to the shed, a plurality of auxiliary nozzles (5.1a-c to 5.na-c) for further transferring the weft yarn in the shed, and In a device comprising one measurement pickup or a plurality of measurement pickups (7.1, 7.2, 17),
In order to measure the measured value, which varies depending on the speed of the weft and / or the path along which the weft moves during the weft insertion, several times or continuously without contact, a special measurement pickup (6, 6.1-6) will be described below. .5) said at least one measuring pickup, which is formed for multiple or continuous measurements during the insertion of the weft thread and is provided at or behind the outlet of the thread reservoir (21) The first acceleration nozzle behind the centering device (23) or at or behind the yarn brake (9) provided separately from the yarn reservoir (21) or following the yarn reservoir (3) provided at or behind it, in which the device additionally uses the at least one special measuring pickup during the insertion of the weft, and the speed and / or the weft Using the evaluation part for determining a value for a parameter linked to the path the weft thread travels and / or the speed of the weft thread and / or the path the weft thread travels, and the value determined during weft insertion Device comprising a control part (10) for adjusting and / or controlling the weft insertion, in particular the current weft insertion.   7. The device according to claim 6, wherein the at least one special measurement pickup (6, 6.1-6.5) provides a measured value which varies depending on the speed of the weft and / or the path along which the weft travels. A device suitable for non-contact measurement during insertion or at least 50 times, or at least 200 times, or at least 500 times during a portion of the weft insertion.   Device according to claim 6 or 7, wherein the at least one special measurement pickup (6, 6.1-6.5) has a measurement value that varies depending on the speed of the weft and / or the path along which the weft travels. Device suitable for non-contact measurement during said weft insertion, or during a portion of weft insertion, at least every 0.5 ms, or at least every 0.2 ms, or at least every 0.05 ms.   9. A device according to any one of claims 6 to 8, wherein the at least one special measurement pickup (6, 6.1 to 6.5) is according to a laser interferometry, a laser Doppler method or a spatial filter method. A device that is a measurement pickup that operates according to or a pickup that operates with a second measurement pickup according to a correlation method.   10. The device according to any one of claims 6 to 9, wherein the at least one special measurement pickup (6, 6.1 to 6.5) comprises the yarn centering device (23) and the yarn brake (9). Between the yarn brake (9) and the first acceleration nozzle (3), between the first acceleration nozzle (3) and the end of the shed, or the first Between the accelerating nozzle (3) and the second accelerating nozzle (4), or between the last accelerating nozzle (4) and the shed in the weft insertion direction, or at the entrance to the shed By the way, or on the air jet loom (1) sley or cage (8).   Air jet loom equipped to carry out the method according to any one of claims 1 to 5 and / or comprising the device according to any one of claims 6 to 10.

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