EP0493328A1 - Vorrichtung zur Kontrolle des Schussfadeneintragsluftdrucks auf eine Düsenwebmaschine - Google Patents

Vorrichtung zur Kontrolle des Schussfadeneintragsluftdrucks auf eine Düsenwebmaschine Download PDF

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Publication number
EP0493328A1
EP0493328A1 EP91811000A EP91811000A EP0493328A1 EP 0493328 A1 EP0493328 A1 EP 0493328A1 EP 91811000 A EP91811000 A EP 91811000A EP 91811000 A EP91811000 A EP 91811000A EP 0493328 A1 EP0493328 A1 EP 0493328A1
Authority
EP
European Patent Office
Prior art keywords
injection pressure
weft
data
weaving operation
control factors
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.)
Withdrawn
Application number
EP91811000A
Other languages
English (en)
French (fr)
Inventor
Yoichi c/o Kabushiki Kaisha Toyoda Makino
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.)
Toyota Industries Corp
Original Assignee
Toyoda Jidoshokki Seisakusho KK
Toyoda Automatic Loom Works Ltd
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 Toyoda Jidoshokki Seisakusho KK, Toyoda Automatic Loom Works Ltd filed Critical Toyoda Jidoshokki Seisakusho KK
Publication of EP0493328A1 publication Critical patent/EP0493328A1/de
Withdrawn legal-status Critical Current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
    • D03D47/3026—Air supply systems
    • D03D47/3053—Arrangements or lay out of air supply systems
    • 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
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/007—Loom optimisation

Definitions

  • the present invention relates to an apparatus for controlling weft inserting air pressure in a jet loom of the type wherein a weft is inserted by air jets injected from weft inserting nozzles the pressures of which are controlled in accordance with the information representative of the time at which the leading end of an inserted weft arrives at a weft sensor adapted to detect such leading end of the inserted weft.
  • control valve is provided in the passage for air under pressure to a weft inserting nozzle for controlling the air injection pressure of the nozzle according to the information representative of the time at which the leading end of an inserted weft reaches, or arrives at, a position defined by a weft sensor for detecting the leading end of such inserted weft.
  • control factors are used in actuating the above electrically-operated pressure control valve, including averaged arrival time of the leading ends of a plurality of inserted wefts, reference air injection pressure and incremental step for air injection pressure adjustment, i.e. the minimum degree by which the pressure is increased or decreased for adjustment.
  • an average arrival time is figured out from a predetermined sampling number of detected arrival times, and the air injection pressure is controlled with respect to the reference pressure within a predetermined range according to the above average arrival time. It is to be noted that the data of the control factors used for the trial weaving operation are established differently from those employed in the actual production weaving operation.
  • value of data for the incremental step air injection pressure adjustment is set relatively large in the trial weaving operation so as to permit the air injection pressure to reach its optimum value as quickly as possible, whereas it is set smaller in the production weaving operation than in the trial weaving because the weft insertion during production weaving has already become relatively stabilized.
  • the range of maximum and minimum limits of air injection pressure with respect to the reference pressure is set narrower in the production weaving operation than in the trial weaving operation. In view of the fact that the range of air injection pressure tends to influence the ease of controlling of weft inserting condition, this range should desirably be set moderately narrow for improvement in controlling of weft insertion.
  • an object of the present invention is to provide an apparatus which is capable of automatically setting the data of control factors for the production weaving operation from the data for the trial weaving operation.
  • an apparatus comprising weft detecting means for determining the time at which the leading end of each inserted weft arrives at said weft detecting means, pressure detecting means for detecting air injection pressure of weft inserting nozzle, injection pressure setting means for storing data of injection pressure control factors for trial weaving operation and similar data for production weaving operation and also storing data of detected injection pressure, said control factors including the sampling number of the arrival times, the incremental step for injection pressure adjustment, the range of permissible maximum and minimum limits of the injection pressure, etc., injection pressure adjusting means responding to commands from said injection pressure setting means for adjusting the injection pressure of the weft inserting nozzle, and selecting means for selecting the control factor data for the trial weaving operation or the control factor data for production weaving operation, and the injection pressure setting means is provided with a function of setting the injection pressure detected by said pressure detecting means just when the selection of the data for the production weaving operation is made, as the reference injection pressure for that production weaving operation.
  • the injection pressure setting means is provided with a function of selecting the data of control factors for the production weaving operation when the arrival times of a predetermined sampling number fall within a predetermined permissible range and the variation of detected injection pressures falls within a predetermined range, and also a function of setting the injection pressure detected by the pressure detecting means just when the data of control factors for the production weaving operation are selected by the injection pressure setting means, as reference injection pressure for that production weaving operation.
  • the injection pressure setting means while the control factor data for the trial weaving operation are selected by the selecting means, the injection pressure setting means provides command to the injection pressure adjusting means to perform the injection pressure adjusting control according to that control factor data for the trial weaving operation.
  • the injection pressure setting means provides command to the injection pressure adjusting means to perform the injection pressure adjusting control according that control factor data for the production weaving operation.
  • the injection pressure setting automatically selects the control factor data for the production weaving operation when the arrival times of the predetermined number of sampling fall within the predetermined permissible range and also the variation of the detected pressure becomes stabilized as required.
  • the Apparatus allows for automatically changing the data of various control factors necessary for air injection pressure controlling, which control factors including the sampling number of times at which the leading end of respective insert wefts arrive at the weft detector, incremental step for air injection pressure adjustment, allowable minimum and maximum limits of air pressure, etc., from the trial weaving operation to the actual production weaving operation.
  • control factor data for the trial weaving are changed to the control factor data for the production weaving when the loom operation is changed from the trial operation to the production operation, and the values of the air injection pressures detected by the pressure detectors (13, 14) just when the above loom operation change is made, are established as the reference air pressures for the actual production weaving operation.
  • FIGS. 1 through 5 The following will describe an first embodiment of the invention while referring to FIGS. 1 through 5.
  • a weft Y ejected from a main weft inserting nozzle 1 of a weaving loom is assisted in passing through a shed by relayed air jets from a plurality of auxiliary nozzles, or sub-nozzles 2, 3, 4, 5. If weft insertion is done properly, the leading end of the weft can be detected by a weft sensor 6 within a predetermined range of rotational angle of the weaving loom. Signals from the weft sensor 6, which represents the presence or absence of such detected weft, are transmitted to a computer control C2 which in turn commands the loom to continue or to interrupt its operation according to the signal that the control receives.
  • Injection of air from the main weft inserting nozzle 1 is controlled by a solenoid-operated valve V1, while and injection of air from the auxiliary weft inserting nozzles 2-5 is controlled by similar solenoid-operated valves V2, V3, V4, V5. That is, air is injected from the respective nozzle when the solenoid of its associated valve is energized thereby to open the valve, and the air injection is stopped when the same solenoid is deenergized thereby to close the valve.
  • the valve V1 is connected to an air tank 7 for holding herein air under pressure and supplying the air to the valve, while the valves V2-V5 are connected to a common air tank 8 for holding air under pressure and supplying the air to the valves.
  • the air tanks 7, 9 are connected to a main tank 11 for holding therein source air under pressure, via electrically-operated air pressure control valves 9, 10, respectively, for controlling the air pressures in the respective air tanks 7, 8, hence the air injection pressures of the main weft inserting nozzle 1 and the auxiliary weft inserting nozzles 2-5.
  • Each of the solenoid-operated valves V1-V5 is actuated to open or close according to commands from the control C1 which provides such commands in response to signals transmitted from a rotary encoder 12 monitoring the current angle of rotation of the weaving loom.
  • Data for such commands to control the valves V2-V5 are stored in a data memory of the control C1.
  • the computer control C1 functions to control the operation of the weft inserting nozzles 1-5 according to the above command data and also to a weft insertion control program stored in its program memory.
  • Pressure detectors 13, 14 are connected at their input to the air tanks 7, 8, respectively, for detecting the air pressures in the tanks, and at the output to a computer control C2 for transmitting thereto information of the detected air pressures, so that the control C2 provides a feedback control for the pressure control valves 9, 10 according to the current air pressures detected by the pressure detectors 13, 14.
  • the computer control C2 is connected also to the weft sensor 6 to receive therefrom information of time at which the leading end of each inserted weft reaches, or arrives at, the weft sensor 6 for controlling the operation of the pressure control valves 9, 10 so as to adjust the air pressures in the air tanks 7, 8, in accordance with an average arrival time which is determined by the control C2 from a predetermined sampling number of the weft leading end arrival times detected by the weft sensor 6.
  • the computer control C2 has connected thereto an input device 15, a display device 16 and an operational mode selector switch 17. Data necessary for air injection pressure controlling may be inputted to the control C2 through the input device 15.
  • ⁇ 1 designates the data of the maximum step, or the incremental step for air injection pressure adjustment. It is noted that this maximum step ⁇ 1 is used only when the control range, or the difference between the reference arrival time and the detected arrival time, becomes greater than ⁇ 1.
  • ⁇ 1 represents the data of the sampling number of the arrival times detected by the weft sensor 6 from which an average arrival time is to be figured out.
  • Pm1 and Ps1 indicate the values of initial air pressures in the air tanks 7 and 8, respectively.
  • (Pm1- ⁇ Pm1) and (Pm1+ ⁇ Pm1) depict the values of allowable minimum and maximum limits of air pressure in the air tank 7, respectively.
  • (Ps1- ⁇ Ps1) and (Ps1+ ⁇ Ps1) show the values of allowable minimum and maximum limits of air pressure in the air tank 8, respectively.
  • These control factor data, or ⁇ 1, ⁇ 1, ⁇ 1, Pm1, ⁇ Pm1, Ps1 and ⁇ Ps1, shown on the G1 screen are employed in the adjusting mode for the trial weaving operation.
  • FIG. 3 shows a screen G2 in "detecting" or trial mode, indicating thereon the data of the current arrival time detected by the weft sensor 6, expressed in the rotational angle ⁇ of the loom, and the data of the current air pressures Pm2, Ps2 in the air tanks 7, 8, hence the current air injection pressures of the main nozzle and the auxiliary nozzles, or sub nozzles, detected by the pressure detectors 13, 14.
  • FIG. 4 shows a screen G3 in "production" mode, displaying the data of the respective control factors in the mode of production weaving operation.
  • the control factor data including ⁇ 2, ⁇ 2, ⁇ 2, Pm2, ⁇ Pm2, Ps2 and ⁇ Ps2 shown on the screen G3 are used in the production mode for the actual production weaving operation.
  • FIGS. 5 and 6 shows a flow chart describing a program for changing the operational mode from the adjusting mode shown on the screens G1 to the detecting mode on the screen G2 and further to the production mode on the screen G3.
  • the computer control C3 is operable in accordance with this program to control the air injection pressures of the weft inserting nozzles 1-5 during the trial and production weaving operations.
  • the computer control C2 selects the control factor data for the adjusting mode and displays them on the screen G1.
  • the loom is started to operate for trial weaving, with simultaneous changing of the display from the adjusting mode screen G1 to the detecting mode screen G2. While the loom is thus running for the trial weaving operation, the screen G2 successively displays the values of the current air injection pressures of the main weft inserting nozzle 1 and the auxiliary nozzles V2-V5, or the pressures Pm2, Ps2 in the air tanks 7, 8 detected by the pressure detectors 13, 14, as well as the value of the current arrival time ⁇ .
  • the control G2 functions to control the air injectionpressures in such a way that the detected arrival time ⁇ converge toward the reference arrival time.
  • controlling of the arrival time ⁇ and air injection pressures Pm2, Ps2 is performed in such a way that the weaving operation itself may be stabilized.
  • the mode selector switch 17 is changed from the adjusting mode position to the production mode position.
  • the screen G2 is changed to the screen G3, and the control C2 selects the control factor data ⁇ 2, ⁇ 2, ⁇ 2, Pm2, (Pm2- ⁇ Pm2), (Pm2+ ⁇ Pm2), Ps2, (Ps2- ⁇ Ps2), (Ps2+ ⁇ Ps2) and displays them on the screen G3. That is, changing of the mode selector switch 17 from the adjusting mode to production mode position, the control factor data for the adjusting mode (or data for the trial weaving) are changed automatically to the control factor data for the production mode (or data for production weaving).
  • the value ⁇ 1 of the incremental step in the adjusting mode is set greater that the value az in the production mode so that optimum reference pressures Pm2, Pm2 may be reached as quickly as possible during the trial weaving operation in the adjusting mode.
  • the value ⁇ 1 of the control range, or the difference between the reference arrival time and the detected arrival time, in the adjusting mode is set smaller that the value ⁇ 2 in the production mode so that as precise reference pressures Pm2, Pm2 as possible may be found out.
  • the value 1 of the sampling number of arrival times in the adjusting mode is set smaller than the value 2 in the production mode for the purpose of finding the optimum injection pressures Pm2, Pm2 as quickly as possible.
  • the values ⁇ 1, ⁇ 2 of the sampling number, as well as the values ⁇ 1, ⁇ 2 of the control range, are set different from each other between the adjusting and production modes, the values of either one pair, g1, ⁇ 2 or ⁇ 1, ⁇ 2, may be set different.
  • FIGS. 7 and 8 show a flow chart describing another program for changing the operational mode according to the second embodiment of the invention.
  • this program includes an algorithm for automatically changing the operational mode from the production mode back to the adjusting mode when the reference air injection pressure is changed during the production weaving operation.
  • the program has an additional function of automatically changing the operational mode from the adjusting mode to the production mode when the arrival times of a predetermined number of sampling fall consecutively within a predetermined permissible range and also the detected pressures are found stabilized during the trial weaving operation in the adjusting mode.
  • Such automatic mode changing can make possible changing at the right time from the trial weaving to the production weaving operation.
  • the injection pressure setting means is provided with a function of selecting the data of control factors in accordance with the selection operation of the selector switch, it can make possible injection pressure controlling for the trial weaving operation and the production weaving operation merely by a simple operation of the selector switch and also smooth changeover from the trial weaving to the production weaving operation without any troublesome and time-consuming setting-up procedure.
  • the second embodiment of the invention can offer an advantageous effect in that the weaving operation can be shifted automatically from the trial weaving to the actual production when the arrival times of a predetermined sampling number fall within a permissible range and the variation in the detected pressures are found very little, thus realizing the changeover from the trial weaving to the production weaving operation even without any changing operation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP91811000A 1990-12-27 1991-12-27 Vorrichtung zur Kontrolle des Schussfadeneintragsluftdrucks auf eine Düsenwebmaschine Withdrawn EP0493328A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2408074A JP2936728B2 (ja) 1990-12-27 1990-12-27 ジェットルームにおける緯入れ用圧力制御装置
JP408074/90 1990-12-27

Publications (1)

Publication Number Publication Date
EP0493328A1 true EP0493328A1 (de) 1992-07-01

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EP91811000A Withdrawn EP0493328A1 (de) 1990-12-27 1991-12-27 Vorrichtung zur Kontrolle des Schussfadeneintragsluftdrucks auf eine Düsenwebmaschine

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EP (1) EP0493328A1 (de)
JP (1) JP2936728B2 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4226693A1 (de) * 1991-08-12 1993-02-18 Nissan Motor Stroemungsduesen-webautomat und verfahren zu dessen steuerung
EP1473391A1 (de) * 2003-04-29 2004-11-03 Sultex AG System und verfahren zum eintragen eines schussfadens
US7063109B2 (en) 2003-04-29 2006-06-20 Sultex Ag System and method for inserting a weft thread
WO2006114187A1 (en) * 2005-04-25 2006-11-02 Picanol N.V. Method for introducing a weft thread in a weaving machine
WO2010054835A1 (en) * 2008-11-17 2010-05-20 Picanol N.V. Air weaving machine
EP2228471A1 (de) * 2009-03-11 2010-09-15 Siemens Aktiengesellschaft Verfahren, Vorrichtung und Artikel für eine Luftdüsenwebmaschine
US8150543B2 (en) 2007-09-28 2012-04-03 Siemens Aktiengesellschaft Methods, apparatus and articles for an air jet loom
EP2765229A1 (de) * 2013-02-12 2014-08-13 Kabushiki Kaisha Toyota Jidoshokki Luftdüsenwebmaschine mit einer Anzeigevorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263445A2 (de) * 1986-10-04 1988-04-13 Tsudakoma Corporation Verfahren und Vorrichtung für die Selbstregelung des Schusseintrags in einer Luftdüsenwebmaschine
EP0276829A2 (de) * 1987-01-30 1988-08-03 Tsudakoma Corporation Schusskontrollvorrichtung für Düsenwebmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263445A2 (de) * 1986-10-04 1988-04-13 Tsudakoma Corporation Verfahren und Vorrichtung für die Selbstregelung des Schusseintrags in einer Luftdüsenwebmaschine
EP0276829A2 (de) * 1987-01-30 1988-08-03 Tsudakoma Corporation Schusskontrollvorrichtung für Düsenwebmaschine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4226693A1 (de) * 1991-08-12 1993-02-18 Nissan Motor Stroemungsduesen-webautomat und verfahren zu dessen steuerung
EP1473391A1 (de) * 2003-04-29 2004-11-03 Sultex AG System und verfahren zum eintragen eines schussfadens
US7063109B2 (en) 2003-04-29 2006-06-20 Sultex Ag System and method for inserting a weft thread
WO2006114187A1 (en) * 2005-04-25 2006-11-02 Picanol N.V. Method for introducing a weft thread in a weaving machine
BE1016504A3 (nl) * 2005-04-25 2006-12-05 Picanol Nv Werkwijze voor het inbrengen van een inslagdraad bij een weefmachine.
CN101184877B (zh) * 2005-04-25 2011-01-26 必佳乐有限公司 将纬纱线引入织机的方法
US8170709B2 (en) 2005-04-25 2012-05-01 Picanol, N.V. Method for introducing a weft thread in a weaving machine
US8150543B2 (en) 2007-09-28 2012-04-03 Siemens Aktiengesellschaft Methods, apparatus and articles for an air jet loom
WO2010054835A1 (en) * 2008-11-17 2010-05-20 Picanol N.V. Air weaving machine
BE1018617A3 (nl) * 2008-11-17 2011-05-03 Picanol Nv Luchtweefmachine.
EP2228471A1 (de) * 2009-03-11 2010-09-15 Siemens Aktiengesellschaft Verfahren, Vorrichtung und Artikel für eine Luftdüsenwebmaschine
EP2765229A1 (de) * 2013-02-12 2014-08-13 Kabushiki Kaisha Toyota Jidoshokki Luftdüsenwebmaschine mit einer Anzeigevorrichtung

Also Published As

Publication number Publication date
JPH04228651A (ja) 1992-08-18
JP2936728B2 (ja) 1999-08-23

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