EP0494050A1 - 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
EP0494050A1
EP0494050A1 EP91811001A EP91811001A EP0494050A1 EP 0494050 A1 EP0494050 A1 EP 0494050A1 EP 91811001 A EP91811001 A EP 91811001A EP 91811001 A EP91811001 A EP 91811001A EP 0494050 A1 EP0494050 A1 EP 0494050A1
Authority
EP
European Patent Office
Prior art keywords
weft
air
pressure
injection pressure
main
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Withdrawn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
EP91811001A
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 EP0494050A1 publication Critical patent/EP0494050A1/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Withdrawn legal-status Critical Current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
    • D03D47/3033—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
    • D03D47/3033—Controlling the air supply

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 a main weft inserting nozzle and auxiliary weft inserting nozzles the pressures of which are controlled according to the information representative of the time at which the leading end of an inserted weft arrives at a predetermined position in the loom.
  • weft insertion is largely dependent on the air injection pressure setting of the nozzle. Even if an optimum injection pressure is established for a given weft during trial weaving operation, flying condition of the weft may be varied during the subsequent actual production weaving operation due to various influencing factors such as varying weft supply cheese diameter, irregularities of the weft itself, etc., with the result that successful weft insertion may not be achieved with use of the initially established air injection pressure.
  • the weft may be slackened or formed with a loop at its leading end if the weft is released too early from the weft measuring and storage device, thereby causing failure in weft insertion.
  • the apparatus according to the Publication No. 64-3969 is unable to cope with such a situation.
  • the apparatus according to the Publication No. 63-24147 which relies on the information regarding the time when the weft releasing from the weft measuring and storage device is completed, without using the information of the weft end arrival time, for controlling the air injection pressure of the main weft inserting nozzle so as to permit the weft end arrival time to fall within the target range, lacks controlling precision and hence certainty of allowing the weft to reach a terminating end of weft insertion at a time within a predetermined target range of such time.
  • the apparatus according to the Publication No. 61-34259 which controls the air injection pressure of the main weft inserting nozzle in response to the information of both the weft released time at the weft measuring and storage device and the weft end arrival time at the terminating end of the weft inserting passage, can solve the above problems to a certain extent. With this apparatus, however, it is difficult to permit the weft end arrival time to fall within the target range because the information of the arrival time is not used directly in this apparatus for controlling of the air injection pressure.
  • the effect of the controlled air injection pressure of only the main weft inserting nozzle cannot be maintained in the latter half of the weft insertion, so that the problems of the above-mentioned slackening of the weft and looping of its leading end cannot be prevented with certainty by this apparatus.
  • the apparatus which controls the air injection pressure of only the main weft inserting nozzle cannot cope with the problem associated with air consumption by air injection from auxiliary weft inserting nozzles.
  • an object of the present invention is to provide an apparatus which is capable of solving the problems of weft slackening taking place during the latter half of weft insertion and failure in weft insertion and also of improving, or reducing, the air consumption.
  • an apparatus for controlling weft inserting air pressure in a jet loom comprising weft released time detecting means for detecting the time at which releasing of a weft from a weft winding and storage device is completed, weft end arrival time detecting means disposed at a predetermined position for detecting the time at which the leading end of an inserted weft arrives at said arrival time detecting means, first adjusting means for adjusting the air injection pressure of a main weft inserting nozzle, second adjusting means for adjusting the air injection pressure of auxiliary weft inserting nozzles, and control means for controlling the air injection pressure adjustments by said first and second adjusting means, wherein said control means is provided with functions of controlling the air injection pressure of said main weft inserting nozzle according to the detected weft end arrival time and of controlling the pressure difference between the air injection pressure of said main weft inserting nozzle and that of said auxiliary weft inserting nozzles according to the time difference between the detected weft end
  • the air injection pressure adjustment control means adjusts the injection pressure of the main weft inserting nozzle to be decreased. If the detected arrival time is too late, on the other hand, the air injection pressure of the main nozzle is adjusted to be increased. After such injection pressure controlling, the control means makes adjustment to increase the pressure difference between the air injection pressure of the main weft inserting nozzle and that of said auxiliary weft inserting nozzles by increasing the air injection pressure of the latter auxiliary nozzles if the time difference between the detected weft end arrival time and the detected weft released time is greater than a target value. If the time difference is less than the target value, the above pressure difference is adjusted to be decreased by decreasing the air injection pressure of the auxiliary weft inserting nozzles.
  • FIGS. 1 through 3 The following will describe an embodiment of the apparatus for controlling the weft inserting air pressure in a jet loom according to the present invention while referring to FIGS. 1 through 3.
  • Reference numeral 1 designates a weft measuring and storage device of winding type in a jet loom wherein formation of windings of reserve weft on a weft winding surface la of the device and releasing of the reserve weft is controlled by a solenoid 2 which is adapted to actuate a stop pin 2a to move into and away from engagement with the winding surface la.
  • the solenoid 2 is connected to a computer control C1 which receives information from a weft release detector 3 adapted to detect the time at which weft releasing from the weft measuring and storage device is completed, such time being referred to as "weft released time” hereinafter.
  • the on/off operation of the solenoid 2 is controlled from commands transmitted by the computer control C1 according to the information from the weft release detector 3.
  • a weft Y released from the weft winding surface la of the weft measuring and storage device 1 and then ejected from a main weft inserting nozzle 4 is assisted in passing through a shed by relayed air jets from a plurality of auxiliary weft inserting nozzles, or sub-nozzles, 5, 6, 7, 8. If weft insertion is done properly, the leading end of the inserted weft can be detected by a weft sensor 9 within a predetermined range of rotational angle of the weaving loom.
  • Injection of air from the main weft inserting nozzle 4 is controlled by a solenoid-operated valve V1, while and injection of air from the auxiliary weft inserting nozzles 5-8 is controlled by similar solenoid-operated valves V2, V3, V4, V5. That is, air injection from the respective nozzle takes place when the solenoid of its associated valve is energized, or turned on, thereby to open the valve, and the air injection is stopped when the same solenoid is deenergized, or turned off, thereby to close the valve.
  • the valve V1 is connected to an air tank 10 for holding therein air under pressure and supplying the air to the valve V1, while the valves V2-V5 are connected to a common air tank 11 for holding air under pressure and supplying the air to the respective valves V2-V5.
  • the air tanks 10, 11 are connected to a main tank 14 for holding therein source air under pressure, via electrically-operated air pressure control valves 12, 13, respectively, for controlling the air pressures in the respective air tanks 10, 11, hence the air injection pressures of the main weft inserting nozzle 4 and the auxiliary weft inserting nozzles 5-8.
  • 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 15 monitoring the current angle of rotation of the weaving loom.
  • Data for such commands to control the valves V1-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 4-8 according to the above command data and also to a weft insertion control program stored in its program memory.
  • pressure detectors 16, 17 which are connected at their input to the air tanks 10, 11, respectively, for detecting the air pressures in the tanks, and at their output to a computer control C2 for transmitting thereto information of the detected air pressures, thus the control C2 providing a feedback control for the pressure control valves 12, 13 according to the current air pressures detected by the pressure detectors 16, 17.
  • the computer control C2 functions to control the operation of the pressure control valves 12, 13, thereby controlling the air injection pressures of the main and auxiliary weft inserting nozzles 4-8, in accordance with the pressure control program shown in FIG. 3. The following will describe in detail the manner in which controlling of the air injection pressure of the nozzles is performed.
  • the computer control C2 successively samples the weft released times TBW and the arrival times TB of a predetermined sampling number "n" from the weft release detector 3 and the weft sensor 9, respectively.
  • the control C2 then calculates an average arrival time ⁇ TW> n .
  • the absolute valve of the difference between a predetermined target arrival time TW o and the above calculated average arrival time ⁇ TW> n , or TW o - ⁇ TW> n is equal to or less than a permissible value of difference ⁇ , the current air injection pressure P M of the main weft inserting nozzle 4 is maintained as it is without being changed by adjustment. If the above absolute value is greater than ⁇ , however, the air injection pressure P M is changed for adjustment.
  • the air injection pressure P M of the main weft inserting nozzle 4 is adjusted for an increase; on the other hand, in the event that ⁇ TW> n -TW o ⁇ - ⁇ , i.e. if the arrival time is too early, the air injection pressure P M is adjusted for a decrease.
  • control C2 After such controlling of the air injection pressure of the main weft inserting nozzle 4, the control C2 operates to control the air injection pressure Ps of the auxiliary weft inserting nozzles 5-8 in accordance with the line "f" in FIG. 2.
  • ⁇ TW-TBW> n on the ordinate thereof represents the average difference between the arrival time TW detected by the weft sensor 9 and the weft released time TBW detected by the weft release detector 3, and P f on the abscissa indicates the difference between the air injection pressure P s of the auxiliary weft inserting nozzles 5-8 and the air injection pressure P M of the main weft inserting nozzle 4. That is, the line "f" in the diagram represents the function to correlate the average difference ⁇ TW-TBW> n and the pressure difference P f , which may be determined from experiments. As seen in the diagram of FIG.
  • the average difference between the arrival time TB and the weft released time TBW, or ⁇ TW-TBW> n is decreased with an increase of the pressure difference P f until P ⁇ is reached and, thereafter, the average difference ⁇ TW-TBW> n becomes constant.
  • the control C2 functions to control the injection pressure of the auxiliary nozzles 5-8 toward the target pressure difference ⁇ . That is, when the absolute value of difference between ⁇ TW-TBW> n and ⁇ is equal to or less than a predetermined permissible value ⁇ , the current air injection pressure of P s the auxiliary nozzles 5-8 is maintained as it is without being changed by adjustment.
  • the air injection pressure P s is changed by adjustment.
  • the air injection pressure P s of the auxiliary nozzles 5-8 is set higher than the pressure P M of the main nozzle 4, the pressures P M and P s may be established in opposite relation.
  • the above-described controlling of the air injection pressures P M , P s of the main and auxiliary weft inserting nozzles 4 and 5-8 is performed repeatedly for each predetermined sampling number "n" of detected arrival times TW and weft released times TBW.
  • the injection pressure P M of the main weft inserting nozzle 4 determines the weft flying speed during the initial period of weft insertion, and the arrival time TW is largely dependent on this weft flying speed. Therefore, the leading end of an inserted weft can be permitted to reach the weft detector 9 at an appropriate time within the target range of arrival time TW by properly controlling the injection pressure PM of the main weft inserting nozzle 4 according to the detected arrival times TW.
  • the injection pressure P s of the auxiliary weft inserting nozzles 5-8 largely influences the condition or attitude of the weft being flown during the remaining period of the weft insertion. That is, failure in weft insertion resulting from irregularities of weft flying, e.g., weft slackening or loop forming at its leading end, is caused by improper setting of the injection pressure P s .
  • the above irregular motion of weft can be prevented successfully by controlling the pressure difference P f between P s and P M , or specifically by adjusting the pressure P s of the auxiliary weft inserting nozzles 5-8 according to the average difference between the arrival time TW detected by the weft sensor 9 and the weft released time TBW detected by the weft release detector 3.
  • the air flow rate by such air injection with prevention of the above troubles such as weft slacking and looping taken into account is determined by the line "f" of FIG. 2. That is, once the target value of ⁇ TW-TBW> n is established, the air flow rate by air injection from the main and auxiliary weft inserting nozzles 4, 5-8 can be specified, so that no more air will be consumed than necessary. Particularly, when the target value of ⁇ TW-TBW> n is set at, for example, ⁇ , the pressure difference P f may be set at P ⁇ , at which only minimum air consumption is required, but while maintaining successful weft inserting operation.
  • the present invention is not limited to the above illustrated embodiment, but may be practiced in other modifications, as exemplified by flow chart in FIG. 4.
  • the pressure difference P f is adjusted toward the target difference P a . This manner of controlling can further reduce the air consumption.
  • the difference between P f ( ⁇ TW-TBW> n ) and P ⁇ instead of the difference between ⁇ TW-TBW> n and ⁇ , may be used for controlling the pressure difference P f .
  • the apparatus according to the present invention wherein the air injection pressure of the main weft inserting nozzle is controlled according to the detected weft end arrival time, and the pressure difference between the air injection pressure of the main weft inserting nozzle and that of the auxiliary weft inserting nozzles is controlled according to the time difference between the detected weft end arrival time and the detected weft released time, is capable adequately controlling both the air injection pressure of the main weft inserting nozzle that would otherwise affect the arrival time and the air injection pressure of the auxiliary weft inserting nozzles that would otherwise cause troubles such as weft slackening and looping of its leading end, thus realizing dependable controlling of weft inserting air pressure in a jet loom without allowing consumption of unnecessary excess air.
  • the apparatus allows to achieve dependable controlling of weft inserting air pressure in a jet loom while improving i.e. reducing air consumption.
  • the air injection pressure of the main weft inserting nozzle 4 is controlled by the computer control C2 which then controls the pressure control valve 12 according to the arrival time detected by the weft sensor 9.
  • the air injection pressure of the auxiliary weft inserting nozzles 5-8 is controlled by the computer control C2 which then controls the pressure control valve 13 according to the difference between the above arrival time and the weft released time detected by the weft release detector 3.
  • Main weft inserting nozzle 3 ... Weft release detector as the weft released time detecting means; 5-8 ... Auxiliary weft inserting nozzles; 9 ... Weft sensor as the arrival time detecting means; 12, 13 ... Electrically-operated air pressure control valves as the air injection pressure adjusting means; C2 ... Computer control as the control means for controlling the air injection pressure adjustment.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP91811001A 1990-12-29 1991-12-27 Vorrichtung zur Kontrolle des Schussfadeneintragsluftdrucks auf eine Düsenwebmaschine Withdrawn EP0494050A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP416813/90 1990-12-29
JP2416813A JP2701545B2 (ja) 1990-12-29 1990-12-29 ジェットルームにおける緯入れ用圧力制御装置

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EP0494050A1 true EP0494050A1 (de) 1992-07-08

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554222A1 (de) * 1992-01-28 1993-08-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Verfahren zur Steuerung des Schusseintrages in einer Düsenwebmaschine
EP0786546A1 (de) * 1996-01-25 1997-07-30 Lindauer Dornier Gesellschaft M.B.H Verfahren zum Überwachen der Funktionstüchtigkeit elektrisch ansteuerbarer Magnetventile in Webmaschinen
EP0962566A2 (de) * 1998-06-02 1999-12-08 Lindauer Dornier Gesellschaft M.B.H Verfahren zum Überwachen des Schussfadenfreigabe- und Stoppvorganges an Vorspulgeräten für Webmaschine
EP2037024A1 (de) 2007-09-12 2009-03-18 Sultex AG Verfahren zur Druckregelung in einer Webmaschine und Webmaschine mit Druckgegelsystem
CN103820923A (zh) * 2012-11-19 2014-05-28 株式会社丰田自动织机 用于设定空气喷射织机中的纬纱插入条件的设备
CN106400279A (zh) * 2016-12-14 2017-02-15 浙江泰坦股份有限公司 喷气织机辅助压力控制装置
CN113529247A (zh) * 2020-04-16 2021-10-22 株式会社丰田自动织机 喷气织机的异常检测方法和喷气织机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6190250B2 (ja) 2013-11-14 2017-08-30 株式会社豊田自動織機 エアジェット織機の緯糸検知装置
JP6367784B2 (ja) * 2015-03-27 2018-08-01 株式会社豊田自動織機 エアジェット織機の緯糸検知装置
CN105063864B (zh) * 2015-09-22 2017-05-10 吴江万工机电设备有限公司 一种辅助喷嘴喷射气流控制系统
JP6558348B2 (ja) 2016-11-18 2019-08-14 株式会社豊田自動織機 エアジェット織機における緯糸飛走状態検知装置

Citations (4)

* 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
EP0344104A1 (de) * 1988-05-26 1989-11-29 GebràœDer Sulzer Aktiengesellschaft Webmaschine mit Schusseintragsregelsystem
US4915142A (en) * 1988-09-05 1990-04-10 Nissan Motor Co., Ltd. Weft insertion control system for jet loom responsive to inserted weft end behavior

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01321950A (ja) * 1988-06-20 1989-12-27 Toyota Autom Loom Works Ltd エアジェットルームのよこ入れ制御方法

Patent Citations (4)

* 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
EP0344104A1 (de) * 1988-05-26 1989-11-29 GebràœDer Sulzer Aktiengesellschaft Webmaschine mit Schusseintragsregelsystem
US4915142A (en) * 1988-09-05 1990-04-10 Nissan Motor Co., Ltd. Weft insertion control system for jet loom responsive to inserted weft end behavior

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554222A1 (de) * 1992-01-28 1993-08-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Verfahren zur Steuerung des Schusseintrages in einer Düsenwebmaschine
EP0786546A1 (de) * 1996-01-25 1997-07-30 Lindauer Dornier Gesellschaft M.B.H Verfahren zum Überwachen der Funktionstüchtigkeit elektrisch ansteuerbarer Magnetventile in Webmaschinen
US5787937A (en) * 1996-01-25 1998-08-04 Lindauer Dornier Gesellschaft Mbh Method for monitoring the proper functioning of electromagnetic air valves in pneumatic looms
EP0962566A2 (de) * 1998-06-02 1999-12-08 Lindauer Dornier Gesellschaft M.B.H Verfahren zum Überwachen des Schussfadenfreigabe- und Stoppvorganges an Vorspulgeräten für Webmaschine
DE19824613A1 (de) * 1998-06-02 1999-12-09 Dornier Gmbh Lindauer Verfahren zum Überwachen des Schußfadenfreigabe- und Stoppvorganges an Vorspulgeräten für Webmaschinen
US6176272B1 (en) 1998-06-02 2001-01-23 Lindauer Dornier Gesellschaft Mbh Method for monitoring the operation of an electromagnet in a weft prewinder of a weaving loom
EP0962566A3 (de) * 1998-06-02 2001-05-23 Lindauer Dornier Gesellschaft M.B.H Verfahren zum Überwachen des Schussfadenfreigabe- und Stoppvorganges an Vorspulgeräten für Webmaschine
EP2037024A1 (de) 2007-09-12 2009-03-18 Sultex AG Verfahren zur Druckregelung in einer Webmaschine und Webmaschine mit Druckgegelsystem
CN103820923A (zh) * 2012-11-19 2014-05-28 株式会社丰田自动织机 用于设定空气喷射织机中的纬纱插入条件的设备
CN103820923B (zh) * 2012-11-19 2015-09-02 株式会社丰田自动织机 用于设定空气喷射织机中的纬纱插入条件的设备
CN106400279A (zh) * 2016-12-14 2017-02-15 浙江泰坦股份有限公司 喷气织机辅助压力控制装置
CN113529247A (zh) * 2020-04-16 2021-10-22 株式会社丰田自动织机 喷气织机的异常检测方法和喷气织机

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JP2701545B2 (ja) 1998-01-21
JPH04241135A (ja) 1992-08-28

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