EP0587535A1 - Schussfadeneintragskontrollvorrichtung in eine Düsenwebmaschine - Google Patents

Schussfadeneintragskontrollvorrichtung in eine Düsenwebmaschine Download PDF

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Publication number
EP0587535A1
EP0587535A1 EP93810643A EP93810643A EP0587535A1 EP 0587535 A1 EP0587535 A1 EP 0587535A1 EP 93810643 A EP93810643 A EP 93810643A EP 93810643 A EP93810643 A EP 93810643A EP 0587535 A1 EP0587535 A1 EP 0587535A1
Authority
EP
European Patent Office
Prior art keywords
air
control valve
weft
air supply
control apparatus
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Withdrawn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
EP93810643A
Other languages
English (en)
French (fr)
Inventor
Hirohiko c/o Kabushiki Kaisha Toyoda Ishikawa
Masanobu c/o Kabushiki Kaisha Toyoda Sakai
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 EP0587535A1 publication Critical patent/EP0587535A1/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Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to a weft insertion control apparatus in a jet loom operable to insert a weft by air jet issued in a weft inserting nozzle of the loom.
  • Weft insertion in a jet loom is influenced by characteristics of air injection pressure change of a main weft inserting nozzle, in particular, of initial pressure rise of the air injection. If the pressure rise time is short, rapid weft insertion can be achieved and air consumption saved. If air jet with a rapid pressure rise is used for inserting a weak weft, however, its leading end may be broken during insertion. Furthermore, a weft of hard twist filament yarn, if inserted by such air jet, may be untwisted at its leading end and caught by a warp sheet.
  • pressure rise takes place in a stepped manner and the pressure rise when high pressure air is supplied to the nozzle after the early period of air injection is so rapid that successful insertion of a weak or hard twist weft cannot be accomplished with safety.
  • Prior art according to Publication 59-193882 is disadvantageous in that part of air under pressure leaks constantly through the exhaust line during air injection, thus inviting excessive air consumption.
  • a control apparatus which comprises an air supply control valve disposed in an air supply line and connected to a weft inserting nozzle of the loom via the air supply line for controlling supply of air under pressure to the weft inserting nozzle, an air exhaust line branching off from the air supply line between the air supply control valve and the weft inserting nozzle, a flow control valve disposed in the air exhaust line, and an air exhaust control valve disposed in the air exhaust line and operable to open during an early period of air injection by the weft inserting nozzle for each weft insertion.
  • the invention of the second claim provides a weft insertion control apparatus which comprises an air supply control valve disposed in an air supply-line and connected to a weft inserting nozzle via the air supply line for controlling supply of air under pressure to the weft inserting nozzle, and air pressure buffer means disposed in the air supply line and having formed therein a variable-volume space between the weft inserting nozzle and the air supply control valve.
  • part of air flown through the air supply control valve is allowed to escape through the air exhaust control valve which is opened simultaneously with opening of the air supply control valve.
  • the air exhaust control valve which is opened simultaneously with opening of the air supply control valve.
  • air injection pressure of the main weft inserting nozzle can reach its peak pressure only when the variable-volume space in the air pressure buffer means is filled with air under supply pressure.
  • the pressure rise of air injection by the weft inserting nozzle can be restricted as required by enlarging the volume of the air pressure buffer space.
  • reference numeral 1 designates a main weft inserting nozzle of a jet loom issuing air jet for inserting a weft Y into a warp shed.
  • Numeral 2 depicts an air supply tank holding therein air under supply pressure P which is adjusted by a reducing valve 3.
  • the main weft inserting nozzle 1 is connected to the air tank 2 through air supply conduit 4.
  • a solenoid-operated valve 5 for controlling air supply to weft inserting nozzle 1 is disposed in the conduit 4.
  • the air supply conduit 4 between the nozzle 1 and the valve 5 has an air exhaust conduit 6 branching off therefrom and having therein a flow control valve 7. There is provided a solenoid-operated air exhaust control valve 8 between the flow control valve 7 and the connection between the conduits 4, 6. At the terminating end of the air exhaust conduit 6 is provided a silencer 9.
  • FIG. 1 shows a state of the apparatus wherein the valves 5, 8 are both closed and, therefore, no air is supplied to the main weft inserting nozzle 1.
  • the valves 5, 8 are opened as shown in FIG. 2 by energizing their solenoids.
  • square waveform M denotes a signal that causes the solenoid for the valve 5 to be energized and similar waveform S1 a signal that causes the solenoid for the valve 8 to be energized, respectively.
  • Waveform C1 denotes a pressure change of air injection by the main weft inserting nozzle 1 taking place when the signals M, S1 are applied to the solenoids to open the valves 5, 8 for periods indicated by the signals, respectively.
  • the air injection pressure waveform C1 consists of three portions, i.e. pressure rise C11, pressure peak C12 and pressure fall C13.
  • the pressure peak C12 corresponds to supply pressure P of air in the tank 2 adjusted by the reducing valve 3.
  • the air exhaust control valve 8 is opened simultaneously with opening of the air supply control valve 5, allowing part of air from the valve 5 to be exhausted through the conduit 6.
  • the gradient of the pressure rise C11 of the air injection pressure waveform C1 can become less steep. This gradient of pressure rise depends on the rate at which air is exhausted through the conduit 6. That is, the higher the rate is, the less steep the gradient of pressure rise C11 will be.
  • the rate of air flowing through the exhaust conduit 6 can be changed by adjusting the flow control valve 7.
  • Waveform C0 in FIG. 3(a) shows a pressure change of air injection by the main weft inserting nozzle 1 taking place when the air supply control valve 5 is opened as indicated by solenoid energizing signal M, while the air exhaust control valve 8 is kept closed.
  • the peak pressure C02 in the waveform C0 corresponds to the supply pressure P of air in the tank 2 adjusted by the reducing valve 3 and the gradient of pressure fall C03 is substantially the same as that of the pressure fall C13 in the waveform C1.
  • the inclination of the pressure rise C01 is steep as compared with C11 in the waveform C1 in FIG. 3(b).
  • the manner of opening the air exhaust control valve 8 is not limited to that illustrated in FIG. 3(b).
  • signal S2 to energize the solenoid for the valve 8 may continue to be effective until the air injection pressure reaches its peak P or C22 in the waveform C2.
  • the pressure rise C21 can be further moderated than C11 in FIG. 3(b).
  • the air exhaust control valve 8 may be opened at the end of the peak pressure C22, as indicated by S3 in FIG. 3(c), to make the pressure fall C23 steeper than C03, C13 in FIG. 3 (a) and (b).
  • Such control of air injection pressure can make air injection by residual pressure to take place for a shorter period, with the result that a break of a weak weft due to such air injection by residual pressure can be prevented.
  • air exhaust control valve 8 in the embodiment of FIGS. 1 and 2 is illustrated as a solenoid-operated valve it may be substituted with any mechanical valve.
  • a clutch may be provided in a drive line between the drive source of the loom and the mechanical valve and the clutch is engaged when handling a weak or hard twist weft.
  • the apparatus includes an air pressure buffer tank 10 disposed in the air supply conduit 4 at a location between the main weft inserting nozzle 1 and the air supply control valve 5.
  • the air pressure buffer tank 10 has an adjustably movable partition plate 11 to which an adjusting screw 11a is fixed.
  • the screw 11a is engaged with a threaded hole formed in back wall of the tank 10.
  • an air pressure buffer space can be formed in the tank 10 whose volume can be variable by turning the adjusting screw 11a to move the plate 11 relative to the tank.
  • FIG. 4(a) shows a plate position where the air pressure buffer space in the tank 10 is minimum, while FIG. 4(b) shows a plate position where the buffer space is maximum.
  • FIG. 5(a) shows a waveform C3 of air injection pressure change of the main weft inserting nozzle 1 with the partition plate 11 positioned for minimum air pressure buffer space in the tank 10 shown in FIG. 4(a).
  • FIG. 5(b) shows a similar waveform C4 of air injection pressure change with the partition plate 11 positioned for maximum buffer space shown in FIG. 4(b).
  • Square waveform M indicates application of an energizing signal to the solenoid of the air supply control valve 5.
  • Peak pressures C32 and C42 Of the waveforms C3 and C4, respectively, correspond to supply pressure P of air to the main weft inserting nozzle 1.
  • the pressure rise C41 and pressure fall C43 in FIG. 5(b) obtained with the maximum volume of pressure buffer space in the tank 10 are less steep than the pressure rise C31 and pressure fall C33 in FIG. 5(a) obtained with the minimum volume of buffer space.
  • the buffer space volume in the tank 10 may be enlarged by adjusting the screw 11a so as to moderate the pressure rise of air injection.
  • the pressure rise of air injection by the weft inserting nozzle can be moderated without inviting reduction of peak pressure and excessive loss of air.
  • the pressure rise of air injection by the weft inserting nozzle can be restricted without causing the peak pressure to be dropped and any loss of air.
  • the apparatus provides for a weft insertion control apparatus in a jet loom which permits successful insertion of weak or hard twist weft.
  • Pressure of air in the air supply tank 1 is adjusted by reducing valve 3.
  • the main weft inserting nozzle 1 is connected to the air supply tank 1 through air supply conduit 4.
  • the air supply conduit 4 between the nozzle 1 and the valve 5 has an air exhaust conduit 6 branching off therefrom and having therein a flow control valve 7.
  • a solenoid-operated air exhaust control valve 8 between the flow control valve 9 and the connection between the conduits 4, 6.
  • 1 Main weft inserting nozzle; 4 ... Air pressure supply conduit; 5 ... Air supply control valve; 6 ... Air exhaust conduit; 7 ... Flow control valve; 8 ... Air exhaust control valve; 10 ... Air pressure buffer tank.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP93810643A 1992-09-10 1993-09-09 Schussfadeneintragskontrollvorrichtung in eine Düsenwebmaschine Withdrawn EP0587535A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP24227492A JPH0693533A (ja) 1992-09-10 1992-09-10 ジェットルームにおける緯入れ制御装置
JP242274/92 1992-09-10

Publications (1)

Publication Number Publication Date
EP0587535A1 true EP0587535A1 (de) 1994-03-16

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Application Number Title Priority Date Filing Date
EP93810643A Withdrawn EP0587535A1 (de) 1992-09-10 1993-09-09 Schussfadeneintragskontrollvorrichtung in eine Düsenwebmaschine

Country Status (2)

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EP (1) EP0587535A1 (de)
JP (1) JPH0693533A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101037824B (zh) * 2006-03-13 2010-12-08 津田驹工业株式会社 喷气织机
CN101037823B (zh) * 2006-03-13 2011-01-26 津田驹工业株式会社 喷气织机
CN108866759A (zh) * 2018-07-20 2018-11-23 江南大学 一种编织帘织机及其控制系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103789911A (zh) * 2014-01-16 2014-05-14 青岛天一集团红旗纺织机械有限公司 一种喷气织机停车纬纱自动保护装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5615442A (en) * 1979-07-18 1981-02-14 Tsudakoma Ind Co Ltd Fluid injection method of weft yarn
US4303106A (en) * 1978-09-18 1981-12-01 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method and apparatus for carrying out the filling operation in a jet loom
EP0105561A1 (de) * 1982-09-30 1984-04-18 Rüti-Te Strake B.V. Verfahren zum Transportieren eines Schussfadens durch das Fach mittels eines Fluidums und Webmaschine zum Durchführen dieses Verfahrens
US4466468A (en) * 1979-08-06 1984-08-21 Leesona Corporation Strand delivery system
JPS59193882U (ja) * 1983-06-07 1984-12-22 津田駒工業株式会社 流体噴射織機の多色よこ入れ調圧装置
JPS61225348A (ja) * 1985-03-26 1986-10-07 津田駒工業株式会社 流体噴射式無杼織機の流量制御装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303106A (en) * 1978-09-18 1981-12-01 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method and apparatus for carrying out the filling operation in a jet loom
JPS5615442A (en) * 1979-07-18 1981-02-14 Tsudakoma Ind Co Ltd Fluid injection method of weft yarn
US4466468A (en) * 1979-08-06 1984-08-21 Leesona Corporation Strand delivery system
EP0105561A1 (de) * 1982-09-30 1984-04-18 Rüti-Te Strake B.V. Verfahren zum Transportieren eines Schussfadens durch das Fach mittels eines Fluidums und Webmaschine zum Durchführen dieses Verfahrens
JPS59193882U (ja) * 1983-06-07 1984-12-22 津田駒工業株式会社 流体噴射織機の多色よこ入れ調圧装置
JPS61225348A (ja) * 1985-03-26 1986-10-07 津田駒工業株式会社 流体噴射式無杼織機の流量制御装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8646, Derwent World Patents Index; AN 86-302796 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101037824B (zh) * 2006-03-13 2010-12-08 津田驹工业株式会社 喷气织机
CN101037823B (zh) * 2006-03-13 2011-01-26 津田驹工业株式会社 喷气织机
CN108866759A (zh) * 2018-07-20 2018-11-23 江南大学 一种编织帘织机及其控制系统

Also Published As

Publication number Publication date
JPH0693533A (ja) 1994-04-05

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