EP3293297B1 - Verfahren zur steuerung des schusseintrags in ein webfach einer luftdüsenwebmaschine und webmaschine zur durchführung des verfahrens - Google Patents

Verfahren zur steuerung des schusseintrags in ein webfach einer luftdüsenwebmaschine und webmaschine zur durchführung des verfahrens Download PDF

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Publication number
EP3293297B1
EP3293297B1 EP17172416.4A EP17172416A EP3293297B1 EP 3293297 B1 EP3293297 B1 EP 3293297B1 EP 17172416 A EP17172416 A EP 17172416A EP 3293297 B1 EP3293297 B1 EP 3293297B1
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EP
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Prior art keywords
weft
relay nozzles
machine
mean value
shed
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EP17172416.4A
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English (en)
French (fr)
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EP3293297A1 (de
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Josef Zak
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Vuts AS
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Vuts AS
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/3033—Controlling the air supply
    • D03D47/304—Controlling of the air supply to the auxiliary nozzles

Definitions

  • the invention relates to a method of controlling weft insertion into a shed in an air-jet weaving machine, during which the weft thread is during its passage through the shed acted upon by an auxiliary air flow from relay nozzles, whereby weft arrival times are monitored and the parameters of the action of the auxiliary air flow from the relay nozzles during the next weft insertion are adjusted accordingly.
  • the invention also relates to a weaving machine with a control system of weft insertion into a shed, which comprises a main weft inserting nozzle connected to a source of compressed air and to a device for controlling weft insertion, whereby the main weft inserting nozzle is assigned to the beginning of the shed and a weft thread reserve inserted into the shed is assigned to the main weft inserting nozzle, whereby along the length of the shed are arranged relay nozzles, connected to the source of compressed air and to the device for controlling weft insertion.
  • Behind the shed is arranged a weft arrival sensor, which is connected to the device for controlling weft insertion, to which a sensor of the revolutions of the main shaft of the machine is connected.
  • Fabric is produced on weaving machines, wherein at first a shed is created by warp branches and a weft, or a weft thread, is inserted through the shed. Subsequently, the weft is carried by a weaving reed to the fell of the fabric being formed.
  • the weft is inserted in the shed by flowing air, when the weft thread is arranged in a weft metering device and passes through the main weft inserting nozzle (the front end of the weft yarn is arranged in the main weft inserting nozzle), which is with its outlet directed in a known manner to the weft inserting channel formed in the weaving reed in the direction of the width of the formed fabric.
  • the main weft inserting nozzle is connected to a control device and it is also connected in a controllable manner to a source of compressed air, due to whose action the weft situated in the main weft inserting nozzle is swept at a required moment out of this nozzle towards the weft inserting channel in the weaving reed.
  • a decrease in the velocity of the weft movement through the weft inserting channel in the direction of the weaving reed length has a negative impact and therefore relay (auxiliary) nozzles are arranged along the weaving reed length and are connected to the source of compressed air in a controllable manner.
  • the relay nozzles are directed with their outlet holes of the compressed air in the direction of the insertion, i.e. in the direction of the weft movement or obliquely to the weft movement.
  • the operation of the relay nozzles i.e. blowing the air into the weft inserting channel
  • is energy intensive especially if it is to be performed over the entire period of the weft insertion along the entire length of the weft inserting channel. Therefore, to save energy, an arrangement of the relay nozzles along the length of the weft inserting channel in several groups (sections) has been introduced.
  • the relay nozzles By means of the relay nozzles the compressed air is forced into the weft inserting channel successively according to the current position of the weft fell moving through the weft inserting channel.
  • each section of the relay nozzles has a certain time interval of operation within the weft insertion.
  • the length of this interval also influences the total consumption of compressed air and therefore the overall energy requirements for weft insertion and fabric formation.
  • weft insertion errors would occur.
  • EP 1 384 800 discloses a method of controlling weft insertion on an air-jet weaving machine in which the relay nozzles are divided into groups (sections) in the direction away from the main weft inserting nozzle towards the opposite end of the weaving reed, whereby the individual relay nozzles are connected through control valves of the sections of the relay nozzles to a source of compressed air.
  • the control valves are connected to a control device, which is further connected to a system of monitoring arrival times of the individual weft threads through a weft inserting channel and to a correction system of the time intervals of the relay nozzles.
  • the machine control system operates with set weft arrival times and corresponding lengths of the intervals of operation (blowing) of the individual sections of the relay nozzles.
  • the system of monitoring the arrival times of the individual weft threads monitors the weft arrival times and passes either the individual arrival times or the average values of several arrival times to the correction system which compares these actual arrival times with the set limit values of the weft arrival times. If the current arrival time does not fall within the defined interval, the correction system will issue a correction signal to the control device to correct the start and/or end of the interval in which the respective auxiliary nozzle section operates, i.e., forces the compressed air into the weft inserting channel, to perform the next weft insertion.
  • the correction signal is an instruction to add a correction time before and/or after the set interval of operation of the respective relay nozzle section and so this interval of the respective section abruptly increases.
  • the solution according to EP 1 384 800 also applies a similar technique to the control system of the compressed air pressure of the relay nozzles and of the main weft inserting nozzle.
  • the main drawback of this solution is essentially firmly set length of the intervals of operation of the individual sections of the relay nozzles and possible correction of the length of these intervals which have been preset by basically fixed values on the basis of the result of comparison between the desired weft arrival time and the actual weft arrival time, which allows to reduce slightly air consumption and therefore also energy intensity, while maintaining the weft insertion parameters.
  • a fuzzy control apparatus for a jet loom detects a flying state of a weft yarn, performs, based on a detected value thus detected, fuzzy inference to determine a modification amount to a rotational frequency of a motor, drives the motor to rotate at a predetermined rotational frequency, and corrects the rotational frequency of the motor based on the correction amount.
  • the aim of the invention is to optimize the operation of the relay nozzles and thus allow higher savings in the consumption of compressed air and reductions in energy requirements for the weaving process.
  • the goal of the invention is achieved by a method of controlling weft insertion into a shed in an air-jet weaving machine, whose principle consists in that from weft arrival times during a plurality of successive weft insertions the statistical mean value and the statistical deviation from this value is determined for each section of the relay nozzles along the length of the insertion, whereby the mean value is used for setting the mean value of the interval of the engagement of each section of the relay nozzles to support the insertion depending on the angle of the working cycle of the machine.
  • the value of the statistical deviation is multiplied by the coverage factor of weft arrival and this multiplied value is used for setting the start and the end of the interval of the engagement of each section of the relay nozzles to support the insertion depending on the angle of the working cycle of the machine, and so the moments of the start and the end, and therefore the length of the engagement of the individual sections of the relay nozzles are adaptively and automatically adjusted on the basis of the statistics of the arrival times of a pre-determined number of previous insertions and, consequently, the consumption of compressed air and the energy intensity are adaptively optimized according to the current actual conditions on the machine.
  • the principle of the weaving machine for performing the invention consists in that the device for controlling weft insertion is provided with means for monitoring the statistics of weft arrival times of a pre-determined number of successive insertions and means for determining the mean value and the statistical deviation for each section of relay nozzles or each relay nozzle from the measured values of the weft arrival times of successive weft insertions and means for setting the mean value as the mean value of the interval of the engagement of each section of the relay nozzles (8) to support insertion depending on the angle of the working cycle of the machine and means for multiplying the value of the statistical deviation by coverage factor of probability of weft arrival and using the multiplied value for setting the start and the end of the interval of the engagement of each section of the relay nozzles to support insertion depending on the angle of the working cycle of the machine, and so the moments of the start and the end, and means for adaptive and automatically adjustment of the length of the engagement of the individual sections of the relay nozzles on the basis of the statistics of the weft arrival times of the determined number of
  • Fig. 1 shows a weaving machine with sections of relay nozzles
  • Fig. 2 is a graph of dependence of the position of the weft fell on the angle of the machine
  • Fig. 3 is a graph of the timing of the operation of the individual sections of the relay nozzles operating according to the method of the invention.
  • the invention will be described with reference to an exemplary embodiment of a weaving machine with a set of relay nozzles along a weaving reed.
  • the weaving machine comprises a system of mutually interconnected and/or coordinated mechanisms to form fabric.
  • the weaving machine will be described - only the parts which are necessary for performing the present invention will be described in the specification.
  • the weaving machine comprises a bobbin 1 with a weft thread 2 which is unwound from a weft metering device 3 to be inserted through a shed.
  • the weft thread 2 is guided from the weft metering device 3 to a main weft inserting nozzle 4 , from which the weft thread 2 is inserted by compressed air flow as a weft 5 to the shed 6 created as an opening by the warp threads 7 raising and lowering to form the upper and lower branches of the shed 6 .
  • the main weft inserting nozzle 4 is controllably connected to a source 10 of compressed air.
  • the compressed air supply to the main weft inserting nozzle 4, and, in case of need, also its pressure is controlled by the device 11 for controlling weft insertion (picking the weft 5 into the shed 6 ), e.g., through a control valve 16 .
  • a row of relay nozzles 8 is assigned to the shed 6 along its length, the relay nozzles being divided into sections 9 .
  • the relay nozzles 8 of one section 9 are controllably connected to the source 10 of compressed air, whose supply is controlled by the device 11 for controlling weft insertion (picking the weft 5 into the shed 6 ), e.g. through a control valve 17 .
  • a controlled cutting device 12 for cutting the weft thread 2 is assigned to the path of the weft thread 2 , e.g., suitable scissors are arranged there.
  • a weft 5 arrival sensor 13 also known as a weft stop motion, is assigned to the path of the weft thread 2 /weft 5 .
  • the sensor 13 is connected to the device 11 for controlling weft insertion.
  • a sensor 14 of the weft metering device is assigned to the path of the weft thread 2 /weft 5 , the sensor 14 being connected, e.g., directly or indirectly through an unillustrated control device of the machine to the device 11 for controlling weft insertion.
  • the weft 5 After being inserted through the shed 6, the weft 5 is carried by a beat-up mechanism (not shown) to the fell of the fabric 15 being formed.
  • a sensor 18 of revolutions of the main shaft 19 of the machine is connected to the device 11 for controlling weft insertion.
  • the invention is based on the fact that the movement of the weft 5 in the shed 6 is influenced by random phenomena which can be divided into several groups:
  • Parameter fluctuations in the first group of random variables may occur with a period ranging from a few meters of the weft thread 2 to thousands of meters of the weft thread 2 . At a weaving speed of hundreds of weft insertions per minute for woven widths in the order of meters, these are changes with a period in the order of units of minutes. Parameter fluctuations in the second group are long-term, occurring in the order of days or weeks of three-shift operation. Finally, the third group represents variance between the individual weft insertions.
  • the above-described random character of the weft insertion manifests itself in the distribution of the arrival times of the individual wefts 5 within the time interval.
  • This distribution can be described by the Poisson probability distribution, which can be replaced for the sake of simplicity by the Gaussian distribution.
  • the mean value of the weft 5 arrival times is in the case of the Gaussian distribution given by the average of the individual weft 5 arrival times and the statistical deviation ⁇ is determined from this mean value in a known manner.
  • the statistics of the arrival times are recalculated continuously with each new weft insertion and are determined for the next insertion, which means that the values of the arrival times of the selected number of insertions are kept in the memory of the device 11 for controlling the weft insertion and after each new insertion the oldest value from this set of values is removed and replaced by the value of a new insertion. This ensures "running" recalculation of the statistics of the arrival times for the selected number n of the recent insertions.
  • coverage factor (k) may be any non-negative number and it is the choice of the operator which required coverage factor to use, but this is done either at the cost of reducing the system accuracy, or at the cost of increasing the consumption of air and energy.
  • the probability values for coverage factor k 3 to 4 correspond to the probability of failure of weft to arrive during normal operation.
  • technical limitations must be also taken into account, i.e. the actual length of the weft insertion, or the length of one working cycle of the machine.
  • the actual timing of the valves 17 of the individual sections 9 of the relay nozzles 8 is then such that the start (the opening of the valve 17 ) is determined by the time of the passage of the weft 5 fell above the first relay nozzle 8 in the section 9 connected to this valve 17 and the end (the closing of the valve 17 ) is determined by the time of the passage of the weft 5 fell above the last relay nozzle 8 in the section 9 connected to this valve 17 .
  • the result of the whole process is that in order to optimize the timing of the relay nozzles 8 according to the present invention it is sufficient to monitor (calculate) the statistics of the arrival times of the individual successive wefts 5 and include these data into statistical calculations according to the respective selected distribution, e.g., the Poisson distribution or Gaussian distribution, which enables to determine with the required degree of probability the mean value of these times and the statistical deviation of these times, all this depending on the working cycles of the machine.
  • the respective selected distribution e.g., the Poisson distribution or Gaussian distribution
  • the thus obtained mean value then directly determines the position of the interval of the engagement of the respective section 9 of the relay nozzles 8 relative to the angle of rotation of the main shaft of the machine, or relative to the timing diagram of the machine (fictitious timeline of the machine), and the statistical deviation of these values determines the length of this interval of the engagement, i.e. the moments of the start and the end of the engagement of the respective section 9 of the relay nozzles 8 depending on the angle of the rotation of the main shaft of the machine, or with respect to the timeline of the machine.
  • n of arrival time values of successive weft 5 insertions used for the statistics of the weft arrival and for the control of weft insertion according to the present invention preferably ranging from 2 to 100 weft insertions
  • the development of the statistical values (mean value, statistical deviation) calculated from this number of arrival times reacts in such a manner that the engagement of the individual sections 9 of the relay nozzles 8 during the next insertion is either extended or shortened, including a possible shift in the position of the mean value of this interval relative to the working cycle of the machine, thereby also shifting the start and end moments of the respective nozzle section 8 relative to the working cycle of the machine.
  • the number n of arrival time values of successive weft 5 insertions used for the statistics of the weft arrival and for weft insertion control can be set by the machine operator even from values over 100.
  • the value between 2 and 100, or 99, is chosen for practical reasons and to simplify programming. Nevertheless, as is evident from the principle and the required characteristics of the system, this number n affects the speed of the reaction of the system to the changes in the quality of the weft insertion, and therefore it is determined by a period (number of weft insertions) of fluctuations of those parameters to which it is desirable to respond by adjusting the weft insertion.
  • the outcome of the process is the fact that the timing of the relay nozzles is adaptive and is always optimally set directly by the value statistically calculated for the set value of probability p and the position and the interval length of the engagement of each section 9 of the relay nozzles 8 , i.e. also both start and the end of the interval, is automatically and adaptively changed during the weaving process according to the statistics of the selected number n of the previous weft insertions.
  • the Poisson (Gaussian) distribution curves R show how the engagement of each section 9 of the relay nozzles 8 is affected by the varying statistics of the arrival times.
  • the angle of the working cycle of the machine is indicated on the x-axis and the length of the weft insertion is indicated on the y-axis, whereby the length of the weft insertion corresponds to the position and spacing of the individual sections 9 of the relay nozzles 8 , as can be seen from the following Fig. 3 .
  • the distribution of these weft arrival times 5 around the mean value is "thinner" and the curve of the Gaussian distribution R2 is therefore wider and lower.
  • the desired coverage factor k of probability p that the arrival time of the next weft 5 will fall to the wider and lower distribution R2 then corresponds to a position of a wider interval of the engagement of the final section 9-n of the relay nozzles 8 , i.e. both the start and the end of this engagement of the last section 9-n of the relay nozzles 8 are further from the mean value and the interval of the engagement of the last section 9-n of the relay nozzles 8 is therefore longer.
  • the device 11 for controlling weft insertion is provided with means for monitoring the statistics of weft arrival times of a pre-determined number n of successive insertions and for determination of the mean value and the statistical deviation from the measured values of the insertion times n of weft threads 5 inserted successively and it is also provided with means for adaptive control of the timing of the relay nozzles 8 , or, more specifically, their sections 9 , according to the mean value and coverage factor k of probability p of the insertion while meeting the statistical deviation of the arrival times n of the successively inserted wefts 5 .
  • the necessary means of the device 11 for controlling weft insertion are implemented either purely in software or by a combination of software and hardware.

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  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (6)

  1. Verfahren zur Steuerung der Eintragung eines Schusses (5) in ein Fach auf einer Luftwebmaschine, bei dem auf den Schuss (5) während seines Weges durch das Fach mit einem Lufthilfsstrom aus den Stafettendüsen (8) gewirkt wird, wobei die Flugweitezeiten der Schüsse (5) verfolgt werden und danach die Parameter der Wirkung durch den Lufthilfsstrom aus den Stafettendüsen (8) beim nachfolgenden Schlag aufbereitet werden, dadurch gekennzeichnet, dass aus den Flugweitezeiten der Schüsse (5) während der Anzahl (n) der nacheinander gehenden Schläge der statistische Mittelwert und die statistische Abweichung dieses Mittelwertes für jede Sektion (9) der Stafettendüsen (8) auf der Schlaglänge bestimmt werden, wobei der Mittelwert zur Einstellung des Mittelwertes des Intervalls der Einschaltung von jeder Sektion (9) der Stafettendüsen (8) zur Unterstützung des Schlages in der Abhängigkeit von dem Winkel der Arbeitsdrehzahl der Maschine verwendet wird und der Wert der statistischen Abweichung mit dem Grad (k) der Sicherheit der Wahrscheinlichkeit (p) der Flugweite multipliziert wird und dieser multiplizierte Wert zur Einstellung des Anfangs und des Endes des Intervalls der Einschaltung von jeder Sektion (9) der Stafettendüsen (8) zur Unterstützung des Schlages in der Abhängigkeit vom Winkel der Arbeitsdrehzahl der Maschine verwendet wird, also die Zeitpunkte des Anfangs und des Endes, und also auch der Länge der Einschaltung von einzelnen Sektionen (9) der Stafettendüsen (8) adaptiv und automatisch aufgrund der Statistik der Flugweitezeiten der bestimmten Anzahl (n) der vorherigen Schläge aufbereitet werden, und dadurch auch der Verbrauch der Druckluft und der energetische Aufwand werden adaptiv den aktuellen Ist-Bedingungen auf der Maschine optimiert.
  2. Verfahren nach dem Anspruch 1, dadurch gekennzeichnet, dass der statistische Mittelwert und die statistische Abweichung dieses Mittelwertes für jede eine Stafettendüse (8) bestimmt werden, wobei der Mittelwert zur Einstellung des Mittelwertes des Intervalls der Einschaltung von jeder der Stafettendüsen (8) zur Unterstützung des Schlages in der Abhängigkeit vom Winkel der Arbeitsdrehzahl der Maschine verwendet wird und der Wert der statistischen Abweichung mit dem Grad (k) der Wahrscheinlichkeit (p) der Flugweite multipliziert wird und dieser so multiplizierte Wert zur Einstellung des Anfangs und des Endes des Intervalls der Einschaltung von jeder der Stafettendüsen (8) zur Unterstützung des Schlages in der Abhängigkeit vom Winkel der Arbeitsdrehzahl der Maschine verwendet wird.
  3. Verfahren nach dem Anspruch 1 oder 2, dadurch gekennzeichnet, dass der statistische Mittelwert der Durchschnitt der Werte ist und die statistische Abweichung eine maßgebende Abweichung ist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Anzahl (n) der nacheinander gehenden Schläge durch die Maschinenwartung wählbar ist, im Intervall von 2 bis 100 Schläge vorteilhaft liegt.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Grad (k) der Sicherheit der Wahrscheinlichkeit (p) der Flugweite durch die Maschinenwartung wählbar, vorteilhaft von 3 bis 4 ist.
  6. Webmaschine mit einer Steuerung der Eintragung der Schüsse ins Fach, die aufweist, eine Hauptschlagdüse (4), die an eine Luftdruckquelle (10), und an eine Einrichtung (11) zur Schlagsteuerung angeschlossen ist, wobei die Hauptschlagdüse (4) dem Anfang des Faches (6) zugeordnet ist und ihr ein Vorrat eines Schussfadens zugeordnet ist, der ins Fach eingetragen wird, wobei auf der Länge des Faches (6) Stafettendüsen (8) angeordnet sind, die an eine Druckluftquelle (10) und eine Einrichtung (11) zur Schlagsteuerung angeschlossen sind, und hinter dem Fach (6) ein Sensor (13) der Flugweite des Schusses (5) angeordnet ist, der an die Einrichtung (11) zur Schlagsteuerung angeschlossen ist, an die ein Sensor (18) der Drehzahlen der Hauptwelle (19) der Maschine angeschlossen ist, dadurch gekennzeichnet, dass die Einrichtung (11) zur Schlagsteuerung
    - Mittel zur Verfolgung der Statistik der Flugweitezeiten der bestimmten Anzahl n der nacheinander folgenden Schläge und
    - Mittel zur Bestimmung des Mittelwertes und der statistischen Abweichung für jede Sektion (9) der Stafettendüsen (8) oder jede Stafettendüse (8) aus den Messwerten der Flugweitezeiten n der nacheinander geschlagenen Schüsse (5) und
    - Mittel zur Einstellung des Mittelwertes als eines Hauptwertes des Intervalls der Einschaltung von jeder Sektion der Stafettendüsen (8) zur Unterstützung des Schlages in der Abhängigkeit vom Winkel des Maschinenarbeitszyklus und
    - Mittel zur Multiplikation des Wertes der statistischen Abweichung mit dem Grad (k) der Sicherheit der Wahrscheinlichkeit (p) der Flugweite des Schusses (5) und Verwendung dieses multiplizierten Wertes zur Einstellung des Anfangs und des Endes des Intervalls der Einschaltung von jeder Sektion (9) der Stafettendüsen (8) zur Unterstützung des Schlages in der Abhängigkeit vom Winkel des Maschinenarbeitszyklus und dadurch auch der Zeitpunkte des Anfangs und des Endes, und
    - Mittel zur adaptiven und automatischen Einstellung der Länge der Einschaltung von einzelnen Sektionen (9) der Stafettendüsen (8) aufgrund der Statistik der Flugweitezeiten des Schusses (5) der bestimmten Anzahl (n) der vorangehenden Schläge aufweist, die eine adaptive Optimierung des Druckluftverbrauches und der Energieintensität laut den gegenwärtigen Ist-Bedingungen auf der Maschine erlauben.
EP17172416.4A 2016-08-30 2017-05-23 Verfahren zur steuerung des schusseintrags in ein webfach einer luftdüsenwebmaschine und webmaschine zur durchführung des verfahrens Active EP3293297B1 (de)

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CZ2016-520A CZ2016520A3 (cs) 2016-08-30 2016-08-30 Způsob řízení zanášení útku do prošlupu na vzduchovém tkacím stroji a tkací stroj k jeho provádění

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Publication number Priority date Publication date Assignee Title
JPH02264033A (ja) * 1989-04-05 1990-10-26 Nissan Motor Co Ltd 空気噴射式織機の緯入れ制御装置
JPH11256450A (ja) * 1998-03-10 1999-09-21 Tsudakoma Corp ジェットルームのファジィ制御装置
JP2002069800A (ja) * 2000-09-01 2002-03-08 Tsudakoma Corp 流体噴射式織機の緯入れ制御装置
JP2004052171A (ja) * 2002-07-22 2004-02-19 Tsudakoma Corp エアジェットルームにおける緯入れ制御方法
BE1016504A3 (nl) * 2005-04-25 2006-12-05 Picanol Nv Werkwijze voor het inbrengen van een inslagdraad bij een weefmachine.
EP1951941B1 (de) * 2005-11-21 2013-10-16 Picanol Verfahren zum einführen eines schussfadens in eine luftwebmaschine sowie luftwebmaschine
JP5836653B2 (ja) * 2011-06-13 2015-12-24 津田駒工業株式会社 空気噴射式織機における補助ノズルの噴射位置の調整方法及び装置

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