EP0494051A1 - Dispositif pour la manipulation de fils de trame pour machine à tisser à jet - Google Patents

Dispositif pour la manipulation de fils de trame pour machine à tisser à jet Download PDF

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Publication number
EP0494051A1
EP0494051A1 EP91811002A EP91811002A EP0494051A1 EP 0494051 A1 EP0494051 A1 EP 0494051A1 EP 91811002 A EP91811002 A EP 91811002A EP 91811002 A EP91811002 A EP 91811002A EP 0494051 A1 EP0494051 A1 EP 0494051A1
Authority
EP
European Patent Office
Prior art keywords
weft
reserve
winding
preventing
storage device
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Withdrawn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
EP91811002A
Other languages
German (de)
English (en)
Inventor
Masahiko C/O Kabushiki Kaisha Toyoda Murata
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 EP0494051A1 publication Critical patent/EP0494051A1/fr
Withdrawn legal-status Critical Current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
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/3086—Weft removal

Definitions

  • the present invention relates to a weft handling apparatus in a jet loom wherein a weft unwound from a weft supply cheese is measured by winding and stored temporarily as reserve weft on a weft measuring and storage device type and such reserve weft is then inserted into a warp shed by air jet injected from a main weft inserting nozzle.
  • a weft break occurs on the side upstream of a weft measuring and storage device in a jet loom, it will be properly detected as a long pick by a weft sensor located at the terminating end of the weft inserting passage, but the trailing end portion of the broken weft piece will enter into a warp shed.
  • a weft sensor located at the terminating end of the weft inserting passage, but the trailing end portion of the broken weft piece will enter into a warp shed.
  • the trailing end portion of a broke weft piece is also blown into a warp shed, which makes it very troublesome to remove afterward the weft piece from the cloth fell of a woven fabric.
  • the above-cited prior art apparatus which is intended to solve the above troublesomeness, facilitates the removal of the broken weft piece from the cloth fell by preventing part of the weft from being inserted into the warp shed.
  • an object of the present invention is to provide a weft handling apparatus which can make possible smooth disposal of a broken weft piece in view of typical situation where a weft break occurs most freguently in a jet loom.
  • reserve weft detecting means adjacently to the weft winding surface of the weft measuring and storage device, weft insertion preventing means, and control means for activating the weft insertion preventing means in response to a signal from the reserve weft detecting means then detecting no reserve weft on the weft winding surface.
  • the reserve weft detecting means detects the absence of reserve weft on the weft winding surface.
  • the control means activates the weft insertion preventing means. Therefore, a situation where the entire broken weft piece is inserted into a warp shed can be prevented
  • FIGS. 1 through 7 The following will describe an embodiment of the apparatus according to the present invention while referring to FIGS. 1 through 7.
  • Reference numeral 1 designates a weft measuring and storage device of winding type adapted for use in a jet loom.
  • This device is of a known structure having a weft winding surface 1a and a weft winding tube 1b.
  • a weft Y fed from a cheese 2 is passed through the weft winding tube 1b rotatable around the weft winding surface 1a and a predetermined length of weft is wound round the weft winding surface 1a to be temporarily stored thereround as the windings of reserve weft Y1.
  • the weft winding tube 1b is driven to rotate by a motor 4 which is provided independently from a main motor 3 for driving the loom.
  • Releasing of the windings of reserve weft Y1 on the winding surface 1a is controlled by a stop pin 5a which is movable into and out of engagement with the winding surface 1a by operation of an electromagnetic solenoid 5.
  • a photoelectric weft release sensor 6 of reflection type adjacently to the weft winding surface 1a.
  • An output signal of the weft release sensor 6 representing that a reserve weft Y1 has been released from the winding surface 1a is transmitted to a computer control C which, responding to such signal from the weft release sensor 6 and also to the information of current rotational angle of the loom detected by a rotary encoder 7, controls the on/off operation of the electromagnetic solenoid 5.
  • Such on/off operation of the solenoid 5 causes the stop pin 5a to move into and away from engagement with the weft winding surface 1a for alternatively forming windings of a reserve weft Y1 and then releasing such reserve weft.
  • a reserve weft sensor 8 Adjacently to the weft winding surface 1a is arranged a reserve weft sensor 8 for detecting the winding amount of the reserve weft on the weft winding surface 1a.
  • the information of the winding amount is transmitted from the reserve weft sensor 8 to the computer control C.
  • the control C controls the operational speed of the weft winding motor 4 so that a reserve weft with a predetermined amount is wound at all times round the weft winding surface 1a.
  • the reserve weft Y1 on the winding surface 1a is inserted into a warp shed by air jet injected from a main weft inserting nozzle 9.
  • the nozzle 9 has connected thereto a tube 10 for supplying air under pressure and another tube 11 for supplying breezing air. Supply and stop of the air to the main weft inserting nozzle 9 through the tube 10 is controlled by a solenoid-operated valve .
  • the breezing air is supplied constantly to the nozzle 9 for maintaining the leading end of an inserted weft in a favorably extended position.
  • a pair of weft sensors 12, 13 is disposed at the terminating end of the weft inserting passage for detecting the leading end of an inserted weft Y.
  • the computer control C commands the weaving loom either to continue or to interrupt its operation. That is, if weft insertion is done properly, the leading end of the inserted weft Y only reaches the weft sensor 12 to be detected thereby, but the weft sensor 13 is not reached by the inserted weft.
  • the control C renders the solenoid for the valve , a weft cutter 14 and the solenoid 5 for stop pin 5a inoperative and, simultaneously, causes the main drive motor 3 and the weft winding motor 4 to be stopped.
  • a blow nozzle 15 is disposed immediately below the main weft inserting nozzle 9 such that an air jet from the blow nozzle 15 intersects the air jet from the weft inserting nozzle 9.
  • a weft introducing duct 16 having its inlet positioned in facing relation to the exit of the blow nozzle 15.
  • the weft introducing duct 16 has its exit directed oppositely to the direction of weft insertion by the nozzle 9.
  • An air guide 17 and its associated suction pipe 19 are located adjacently to the exit of the weft introducing duct 16 and a weft sensor 18 of photoelectric transmission type is mounted within the air guide 17.
  • the suction pipe 19 is bent and its exit is directed toward a dust box (not shown).
  • the suction pipe 19 has at its bent portion a blow nozzle 20 which produces air flow toward the dust box (not shown).
  • the main weft inserting nozzle 9, blow nozzle 15, weft introducing duct 16, air guide 17 and suction pipe 19 are all mounted on a slay of the weaving loom for swinging movement therewith. Behind the swinging area of these parts 9, 15, 16, 17, 19 are located a motor 21 and an air cylinder 22.
  • a drive roller 23 is operatively connected to the motor 21 to be driven thereby and its associated follower roller 24 is mounted to the drive rod of the air cylinder 22 so that extending motion of the cylinder 22 causes the follower roller 24 to be brought into contact engagement with the drive roller 23.
  • the blow nozzles 15, 20 are connected to air supply source (not shown) through solenoid-operated two-way valves V2, V3, respectively.
  • the air cylinder 22 is connected to the air supply source (not shown) through a solenoid-operated three-way valve V4.
  • the solenoid 5, the cutter 14 and the solenoid for the valve V1 operation of the solenoids for the valves V2 through V4 and the motor 21 are controlled from commands by the computer control C.
  • the computer control C is operable according to a program shown in FIGS. 5 through 7 for disposing of a weft piece in the event of occurrence of a weft break.
  • a weft break between the cheese 2 and the main weft inserting nozzle 9 occurs most frequently at a position adjacent to the outlet of the weft winding tube 1b.
  • the reserve weft Y1 on the winding surface 1a is released therefrom immediately when the stop pin 5a is moved away from engagement with the winding surface.
  • This abnormal release of the reserve weft Y1 is detected by the reserve weft sensor 8, which then generates a "no weft" signal to the computer control C.
  • control C In response to this signal, the control C generates commands to render the solenoid for the valve V1 and the weft cutter 14 inoperative and, simultaneously, cause the solenoid for the valve V2 to be energized for a predetermined period of time to activate the blow nozzle 15 for the same period of time.
  • Air jet is issued from the blow nozzle 15 to divert part of the weft into the weft introducing duct 16, as shown in FIG. 2, thus preventing the entire weft from being inserted into a shed.
  • the portion of the weft Y1 blown into the duct 16 is moved past the region between the paired rollers 23, 24. As the weft reaches the air guide 17, it is detected by the weft sensor 18.
  • the computer control C actuates an alarm device 26.
  • the control C provides commands to stop the motors 3, 4 and to make the solenoid 5 inoperative.
  • Actuation of the blow nozzle 15 to divert the weft into the weft introducing duct 16 is completed before the loom is coasted to a complete stop at a position just before the beating-up position is reached.
  • the motor 3 is rotated reverse at a slow rate for a predetermined amount so as to form a wide-open shed by upper and lower sheets of warp yarn T.
  • the faulty weft Y2 inserted halfway through the shed and beaten up to the cloth fell W1 of a woven fabric W is freed from the fabric.
  • valves V3, V4 are energized to activate the blow nozzle 20 and to extend the air cylinder 22, respectively. Air under pressure is blown from the blow nozzle 20 into the weft guide 19 and the roller 24 is moved into contact engagement with its associated roller 23 to nip therebetween the weft, as shown in FIG. 3. Subsequently, the motor 21 is started to drive the roller 23. The paired rollers 23, 24 pull the weft Y1 while withdrawing the faulty weft Y2 from the cloth fell W1.
  • the weft sensor 18 then responding to the absence of a weft transmits a signal to the control C, which in response to this signal causes the motor 21 to be stopped and the solenoids for valves V3, V4 to be deenergized.
  • the apparatus described in the above can perform its intended function of preventing weft insertion and withdrawal of a faulty weft at the cloth fell also in the event of an ordinary failure in weft insertion.
  • the weft portion succeeding the inserted weft portion when pulled by the paired rollers 23, 24 and tensioned, is cut off from the latter weft portion by a stationary cutter 25 located at the top of the outlet of the main weft inserting nozzle 9.
  • the apparatus is preventing a broken weft piece Y1, which results from a weft break taking place adjacently to the outlet of the weft winding tube 1b of the weft measuring and storage device 1 of winding type, from being inserted into a warp shed W, and subsequently withdrawing the weft portion present at the cloth fell W1 of woven fabric by pulling its succeeding weft portion prevented from being inserted.
  • the winding amount of reserve weft on the weft winding surface 1a of the weft measuring and storage device 1 is detected by the reserve weft sensor 8.
  • the information from such detection is transmitted to the computer control C, which activates the blow nozzle 15 to prevent weft insertion in response to "no reserve weft" signal from the reserve weft sensor 8.
  • prevention of weft insertion subsequent to the weft break can be done rapidly and the subsequent withdrawal of a faulty weft beaten up to the cloth fell of a woven fabric can be carried out merely by pulling the weft portion prevented from being inserted.
  • 1 Weft measuring and storage device; 1a ... Weft winding surface; 1b ... Weft winding tube; 8 ... Reserve weft detector; 15 ... Blow nozzle as the means for preventing weft insertion; C ... Computer control as the control means; Y1 ... Windings of reserve weft.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP91811002A 1990-12-29 1991-12-27 Dispositif pour la manipulation de fils de trame pour machine à tisser à jet Withdrawn EP0494051A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP416812/90 1990-12-29
JP41681290A JPH04241141A (ja) 1990-12-29 1990-12-29 ジェットルームにおける緯糸処理装置

Publications (1)

Publication Number Publication Date
EP0494051A1 true EP0494051A1 (fr) 1992-07-08

Family

ID=18525002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91811002A Withdrawn EP0494051A1 (fr) 1990-12-29 1991-12-27 Dispositif pour la manipulation de fils de trame pour machine à tisser à jet

Country Status (2)

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EP (1) EP0494051A1 (fr)
JP (1) JPH04241141A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103015013A (zh) * 2012-11-22 2013-04-03 广东溢达纺织有限公司 织机投纱故障自动处理系统及方法
CN104120537A (zh) * 2014-07-23 2014-10-29 山东日发纺织机械有限公司 喷气织机的抽纬装置
BE1021171B1 (fr) * 2012-01-17 2015-05-26 Kabushiki Kaisha Toyota Jidoshokki Dispositif de detection de cassure de fil de trame dans un metier a tisser a jet de fluide dans lequel plusieurs fils de trame sont inseres de maniere simultanee
CN105874113A (zh) * 2013-11-07 2016-08-17 必佳乐公司 用于移除纬纱的装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0236597A1 (fr) * 1986-03-11 1987-09-16 Tsudakoma Corporation Dispositif pour éloigner un fil de trame cassé à un métier à tisser sans navette
US4890650A (en) * 1987-08-25 1990-01-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Detecting and removing faulty weft in a jet loom

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0236597A1 (fr) * 1986-03-11 1987-09-16 Tsudakoma Corporation Dispositif pour éloigner un fil de trame cassé à un métier à tisser sans navette
US4890650A (en) * 1987-08-25 1990-01-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Detecting and removing faulty weft in a jet loom

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1021171B1 (fr) * 2012-01-17 2015-05-26 Kabushiki Kaisha Toyota Jidoshokki Dispositif de detection de cassure de fil de trame dans un metier a tisser a jet de fluide dans lequel plusieurs fils de trame sont inseres de maniere simultanee
CN103015013A (zh) * 2012-11-22 2013-04-03 广东溢达纺织有限公司 织机投纱故障自动处理系统及方法
CN105874113A (zh) * 2013-11-07 2016-08-17 必佳乐公司 用于移除纬纱的装置
CN104120537A (zh) * 2014-07-23 2014-10-29 山东日发纺织机械有限公司 喷气织机的抽纬装置

Also Published As

Publication number Publication date
JPH04241141A (ja) 1992-08-28

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