EP0415875A1 - Procédé pour ajuster l'extension de fil de trame dans la foule et la consommation d'air des tuyères auxiliaires d'un métier à air - Google Patents

Procédé pour ajuster l'extension de fil de trame dans la foule et la consommation d'air des tuyères auxiliaires d'un métier à air Download PDF

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Publication number
EP0415875A1
EP0415875A1 EP90810571A EP90810571A EP0415875A1 EP 0415875 A1 EP0415875 A1 EP 0415875A1 EP 90810571 A EP90810571 A EP 90810571A EP 90810571 A EP90810571 A EP 90810571A EP 0415875 A1 EP0415875 A1 EP 0415875A1
Authority
EP
European Patent Office
Prior art keywords
weft
blowing
relay
time
compartment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90810571A
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German (de)
English (en)
Other versions
EP0415875B1 (fr
Inventor
Godert De Jager
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Itema Switzerland Ltd
Original Assignee
Sulzer AG
Sultex AG
Gebrueder Sulzer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sulzer AG, Sultex AG, Gebrueder Sulzer AG filed Critical Sulzer AG
Publication of EP0415875A1 publication Critical patent/EP0415875A1/fr
Application granted granted Critical
Publication of EP0415875B1 publication Critical patent/EP0415875B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/3073—Detection means therefor
    • 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
    • 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
    • D03D47/3053—Arrangements or lay out of air supply systems

Definitions

  • the invention relates to a method for adjusting the weft extension in a compartment or row compartment and the air consumption of relay nozzles, which form a traveling field in the compartment, for an air jet weaving machine with one or more thread feed systems, the weft threads being supported by a weft processing system with main entry nozzles in the respective compartment are entered by relay nozzles, the arrival of the weft threads at the other end is controlled by a weft guard from the compartment, the weft threads are stopped in their flight by stop elements in front of the compartment, pressure and time control with control and regulating valves to control the main entry nozzles and to control the Relay nozzles a pressure and time control with control and regulating valves is available.
  • Measuring devices for monitoring the thread flight, for registering the thread arrival at the end of a compartment and control devices dependent thereon for setting blowing times and blowing pressures of relay nozzles are known in various designs. So it shows US Pat. No. 4,673,004 discloses an air jet weaving machine with a weft thread changer, in which the arrival of the weft thread tip is registered by sensors in the compartment and at the end of the compartment in order to obtain correction signals for the automatic blowing time adjustment of at least one relay nozzle while the machine is running.
  • Relay nozzles generally have the task of supporting the main entry nozzles when inserting weft, the relay nozzles, as large compressed air consumers, usually forming a time-limited traveling field in order to save compressed air.
  • the compressed air consumption itself is a considerable cost factor in the operation of air jet looms, so that all measures that reduce the operating pressures and compressed air consumption are economically important.
  • the object of the present invention is to keep the compressed air consumption of the relay nozzles as low as possible without the risk of additional machine interruptions. It solves the task of setting the compressed air consumption of the relay nozzles as low as possible without risk while setting up the machine, e.g.
  • the time difference ⁇ t1 between the response of a weft guard at the end of the compartment and the stop blow or an equivalent signal for the leakage of a previously measured weft thread, which is detected with a stop guard positioned in front of the compartment entrance, is measured and as a parameter for the stretching of the weft thread in the compartment and as a parameter for the effect of relay nozzles is used in the control of the weaving machine.
  • an air jet weaving machine with two alternating yarn feed systems is shown, the weft yarns 1, 21 being drawn off from stores 3, 23 with main entry nozzles 2, 22 and being inserted into a compartment 32 with the assistance of relay nozzles 8, 28 which Arrival of the weft threads 1, 21 at the end of the compartment 32 is controlled by a weft thread monitor 6 and the weft threads are stopped in their flight by stop elements 4, 24 which are in front of the compartment 32.
  • the stopper elements 4, 24 block the thread run after a previously measured thread length in the compartment has been entered, and the abrupt braking results in a so-called stop impact on the weft thread.
  • the supply bobbins 5, 25 secure the replenishment of weft threads which are cut off by scissors 7 after the weft insertion, the interface forming a reference for the next weft insertion from the same main insertion nozzle 2, 22. Based on this reference, the weft thread tip must cover at least the distance 33 to the weft guard 6 at the other end of the compartment 32 for the next shot in order to generate an expected arrival signal which can be used once in the control 30 to check the arrival of the weft thread for the To confirm continuation of a normal weaving cycle and on the other hand to generate correction signals for the setting of the main entry nozzles 2, 22 by comparing the target arrival time and the actual arrival time, which change the blowing pressure via a pressure control valve 11, 31 and the blowing time via a control valve 10, 20.
  • a controller group 17 acts on the stopper elements 4, 24 and on the pressure control valves 11, 31 and the control valves 10, 20 of the main entry nozzles 2, 22.
  • a controller group 18 also acts on the relay nozzles 8, 28 in order to generate a moving field in the relay nozzle groups 9, 29 with the control valves 12 and to adjust the pressure of the relay nozzles with the pressure regulating valves 13.
  • the air connections 14 and 15 lead to a compressed air supply unit.
  • the weft thread 1, 21 is so large in excess of the distance 33 between the weft detector 6 and the scissors 7 that the weft thread tip reaches the weft detector 6 before the shortening 27 the stopper elements 4, 24 act on the weft thread when a previously measured weft thread length runs out.
  • the weft thread will hardly reach its ideal extension 34, but will always arrive at the weft monitor 6 late by a weft thread shortening 27, the weft thread shortening 27 essentially being dependent on the deflecting and the stretching effect of the relay nozzles 8, 28.
  • the time for ⁇ t 1 starts to run.
  • stop elements 4, 24 extends according to its elasticity and shortening of the weft thread 27 to a maximum extent, which is a so-called stop impact i.e. corresponds to a tension peak measured in the weft in front of the compartment, which is preferably recorded via stop monitors 16, 26, preferably in the flank rise in tension, and the time ⁇ t 1 ends.
  • the dynamics of the stop blow which are influenced by the mass and elasticity of a weft thread, vary little for a particular machine arrangement and, on the other hand, the dimensional accuracy of the weft thread length and the response accuracy of a weft monitor 6 are high, they play a subordinate role as disturbance variables. Therefore, the deviations in the amount of the time difference ⁇ t 1 represent the deviations of the weft shortening quite well due to deflection over the entire length of the compartment.
  • Stop monitors 16, 26 are mostly available in a wide variety of designs as a force or displacement measurement associated with thread deflection. However, optical stop monitors are also conceivable to determine the runout of a previously measured weft thread, which, as soon as they are activated, measure a thread displacement if the stop stroke does not act in the direction of the acceleration forces otherwise attacking the thread.
  • 4 shows a piezoelectric stop monitor 6, in which the weft thread 1, 21 is deflected at a ceramic eyelet, which in turn is supported in a housing 40 via a sensor film 38 covered with a piezo film and a rubber-like socket 39. The sensor film 38 is coated on both sides with electrical conductors 41, from which the signals are tapped and processed further via a charge amplifier 42 and a Schmitt trigger 43.
  • FIG. 3 shows a laboratory test on the relay nozzles of a weaving machine, the stretching of weft threads in percent with their scatter as a function of the common blowing pressure of the relay nozzles at a constant blowing pressure of the main insertion nozzle being shown as the mean value of a specific number of wefts.
  • the example shows a significantly increasing deflection of the weft thread or lowering the relay nozzle pressures below 3.5 bar. a significant deterioration in thread extension that would hardly be justifiable for production.
  • Similar curves result for the stretching of the weft thread as a function of the blowing time of the relay nozzles, in that the shortening of the blowing time results in a significant shortening of the thread stretching.
  • the approximation takes place from a safely functioning area with high blowing pressure and with a long blowing time, step by step after a certain number of shots, which is preferably between 20 and 2000, the values ⁇ t 1 are statistically evaluated for a quality criterion that lasts as long as gradually reducing the blowing pressure or the blowing time period until an impermissible value is reached, which corresponds, for example, to an impermissible gradient of the average thread extension in FIG. 3.
  • the quality criterion can be changed at any time with a higher probability without any apparent change in the boundary conditions are violated, which for each step for which an injury has been determined provides for the variables blow pressure or blow duration to be increased by a defined amount.
  • the principle described from approaching a limit by means of a parameter from a safe area until there is an injury and moving back by a safety amount until there is no longer an injury, can be done by fine-tuning the parameters of the relay nozzles, which can be done manually, semi-automatically or fully automatically , as well as for the continuous setpoint adjustment or regulation of a parameter of the relay nozzles. It is obvious that such a setting of the parameters represents a kind of optimization in that only as much compressed air is used as is statistically necessary. Compared to previously established setting values, the air consumption of relay nozzles has been reduced by 20 to 30%.
  • the blowing pressure and the blowing time are increased to a safe working area and the signal ⁇ t1 is gradually evaluated statistically over a certain number of shots for a quality criterion.
  • the blowing time is kept constant and the blowing pressure of the last relay nozzle group 9 in the thread flight direction is reduced step by step, so that in the meantime at least one evaluation takes place, by a certain amount, until the thread extension detected by the quality criterion is recognized as too small, whereupon the blowing pressure is reduced by one certain amount per evaluation step is increased until the thread extension is recognized as sufficient.
  • the next step is to gradually increase the blowing pressure for the second-to-last relay nozzle group lowered until the thread stretch is too small and then gradually increased until the thread stretch is sufficient.
  • the further nozzle groups 29, which lie in front of the penultimate relay nozzle group 29 in the direction opposite to the thread flight direction, are set one after the other in the same way in their blowing pressure with the associated pressure control valves 13, 35.
  • the whole process can be iterative by repeating the approaching of the limit again and the correction of the setting for all nozzle groups against the thread flight direction and successively starting with the last group 9.
  • the pressure balance of the nozzle groups 9, 29 can also be carried out with adjustable throttle valves 35.
  • the blowing duration of the relay nozzle groups 9, 29 is then adjusted by gradually reducing the blowing duration, so that at least one evaluation can take place, while maintaining a predefined time grid for the start of the blowing time of the individual nozzle groups and starting with the last group 9 in the direction of flight is until the thread stretch detected with a quality criterion is recognized as too small, whereupon the blowing time is increased by a certain amount per evaluation step until the thread stretch is recognized as sufficient.
  • the further nozzle groups 29, which are located in front of the last nozzle group 9 in the direction opposite to the thread flight direction are successively set in the same way in their blowing duration with the associated control valves 12. The whole process can be iterative in that the repeated approach to the limit and the correction of the setting of the blowing duration for all nozzle groups are repeated one after the other against the thread flight direction and starting with the last group 9.
  • a fine adjustment is e.g. provided when changing articles or at long intervals. Because of the abundance of the data to be evaluated, an external computer 36 is temporarily connected, which supports the internal computer 19 of the machine control 30. The whole adjustment process takes place fully automatically, by storing a program for the time evaluation .DELTA.t 1 and the sequence and regulators 13, 35 for the blowing pressure and the control valves 12 for the blowing period are controlled by the controller 30.
  • a semi-automatic process results if a manual adjustment of the blowing pressure at the pressure adjustment valves 35 and / or the correction for the blowing period to be entered is carried out and acknowledged before the evaluation is continued in a computer.
  • the blowing pressure is reduced by a small step ⁇ p in a program loop, as long as the quality criterion for the yarn stretching was met in the previous step and by a small step ⁇ p put on as long as the quality criterion was not met.
  • the thread extension and the air consumption of the relay nozzles oscillate around the value defined by the quality criterion.
  • the gradient for the mean has become the quality criterion ⁇ t 1 proven to be very meaningful over a certain number of shots.
  • the systematic deviations for the thread extension are better put into perspective if the standard deviation S (t) is included in the quality criterion over the same number of wefts, which means a general form for the quality criterion a ⁇ (S ( ⁇ t1)) ⁇ + b ( ⁇ t 1) ⁇ gives, where a, b are amplification factors and ⁇ , ⁇ are exponents or general mathematical operators. So can ( ⁇ t 1) ⁇ correspond to the differential of ⁇ t1.
  • the stretching forces and the insertion effect of the relay nozzles can be used deliberately to increase the insertion speed if the blowing pressure of the main injection nozzle is limited, for example because of the fraying of the weft tip, at an upper limit by the Quality criterion around a term -c ( ⁇ t 2) ⁇ is expanded, the weakened the mean ⁇ t 2 the time difference ⁇ t2 between the actual arrival in the weft monitor 6 and the target arrival of the weft thread, which, for example, corresponds to a certain angular position of the machine main shaft.
  • c is used as a gain factor and ⁇ as an exponent or mathematical operator.
  • the advantage of such a regulation is that the relay nozzles, as soon as the limit for the blowing pressure of the main entry nozzle is reached, increase the blowing pressure in very small steps without any switching as long as the flight time of the weft thread is too long.
  • the method described here for determining the thread extension can in principle be used to investigate and regulate all parameters which deflect and shorten the weft thread between the stop element 4, 24 and the weft monitor 6 from its ideal extension. It is applicable to air jet looms in which one or more weft preparation systems are assigned to a compartment, and to air jet looms with a row compartment to which one or more weft preparation systems are assigned.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP90810571A 1989-09-01 1990-07-26 Procédé pour ajuster l'extension de fil de trame dans la foule et la consommation d'air des tuyères auxiliaires d'un métier à air Expired - Lifetime EP0415875B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH318389 1989-09-01
CH3183/89 1989-09-01

Publications (2)

Publication Number Publication Date
EP0415875A1 true EP0415875A1 (fr) 1991-03-06
EP0415875B1 EP0415875B1 (fr) 1994-05-18

Family

ID=4250426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90810571A Expired - Lifetime EP0415875B1 (fr) 1989-09-01 1990-07-26 Procédé pour ajuster l'extension de fil de trame dans la foule et la consommation d'air des tuyères auxiliaires d'un métier à air

Country Status (4)

Country Link
US (1) US5067527A (fr)
EP (1) EP0415875B1 (fr)
JP (1) JPH0390653A (fr)
DE (1) DE59005721D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0786546A1 (fr) * 1996-01-25 1997-07-30 Lindauer Dornier Gesellschaft M.B.H Procédé pour contrÔler le fonctionnement de soupapes magnétiques à contrÔle électrique dans les métiers à tisser
DE19824613A1 (de) * 1998-06-02 1999-12-09 Dornier Gmbh Lindauer Verfahren zum Überwachen des Schußfadenfreigabe- und Stoppvorganges an Vorspulgeräten für Webmaschinen

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2898773B2 (ja) * 1991-03-08 1999-06-02 津田駒工業株式会社 ジェットルームの緯入れ制御装置
KR940010634B1 (ko) * 1991-08-12 1994-10-24 닛산 텍시스 가부시끼가이샤 유체 제트 직기 및 그 작동 방법
JPH09228192A (ja) * 1996-02-14 1997-09-02 Tsudakoma Corp よこ入れ制御方法
SE507785C2 (sv) * 1996-11-29 1998-07-13 Texo Ab Metod och anordning vid luft- eller gasströmsburen skyttel i vävmaskin
SE511065C2 (sv) * 1998-03-24 1999-07-26 Texo Ab Anordning för att vid vävmaskin skjuta ut och accelerera en skyttel
JP2001234451A (ja) * 2000-02-22 2001-08-31 Tsudakoma Corp 織機における耳形成装置の駆動方法及び装置
DE10124290C1 (de) * 2001-05-17 2003-01-23 Dornier Gmbh Lindauer Düsenwebmaschine, insbesondere Lüftdüsenwebmaschnine mit einem Schussfadeneintragsystem
DE102012208158B3 (de) * 2012-05-15 2013-09-05 Lindauer Dornier Gmbh Luftdüsenwebmaschine mit einer Vorrichtung zur Druckluftversorgung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567926A1 (fr) * 1984-07-20 1986-01-24 Nissan Motor Metier a tisser equipe d'un systeme de reglage du lancement de la trame
US4673004A (en) * 1984-05-16 1987-06-16 N.V. Weefautomaten Picanol Adjustable control of the weft on a weaving loom
EP0263445A2 (fr) * 1986-10-04 1988-04-13 Tsudakoma Corporation Méthode et dispositif pour le réglage automatique de l'insertion dans un métier à jet d'air
EP0290975A1 (fr) * 1987-05-12 1988-11-17 Tsudakoma Corporation Commande automatique de l'insertion du fil de trame

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1201202B (it) * 1987-01-26 1989-01-27 Omv Off Mecc Vilminore Dispositivo di autoregolazione di alimentazione di filati di trama in telai di tessitura ad aria
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4673004A (en) * 1984-05-16 1987-06-16 N.V. Weefautomaten Picanol Adjustable control of the weft on a weaving loom
FR2567926A1 (fr) * 1984-07-20 1986-01-24 Nissan Motor Metier a tisser equipe d'un systeme de reglage du lancement de la trame
EP0263445A2 (fr) * 1986-10-04 1988-04-13 Tsudakoma Corporation Méthode et dispositif pour le réglage automatique de l'insertion dans un métier à jet d'air
EP0290975A1 (fr) * 1987-05-12 1988-11-17 Tsudakoma Corporation Commande automatique de l'insertion du fil de trame

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0786546A1 (fr) * 1996-01-25 1997-07-30 Lindauer Dornier Gesellschaft M.B.H Procédé pour contrÔler le fonctionnement de soupapes magnétiques à contrÔle électrique dans les métiers à tisser
DE19824613A1 (de) * 1998-06-02 1999-12-09 Dornier Gmbh Lindauer Verfahren zum Überwachen des Schußfadenfreigabe- und Stoppvorganges an Vorspulgeräten für Webmaschinen

Also Published As

Publication number Publication date
DE59005721D1 (de) 1994-06-23
US5067527A (en) 1991-11-26
EP0415875B1 (fr) 1994-05-18
JPH0390653A (ja) 1991-04-16

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