EP0544624A1 - Vorrichtung zum Beseitigen von abgebrochenen Schussfadenstücken in einer Luftwebmaschine - Google Patents

Vorrichtung zum Beseitigen von abgebrochenen Schussfadenstücken in einer Luftwebmaschine Download PDF

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Publication number
EP0544624A1
EP0544624A1 EP92810913A EP92810913A EP0544624A1 EP 0544624 A1 EP0544624 A1 EP 0544624A1 EP 92810913 A EP92810913 A EP 92810913A EP 92810913 A EP92810913 A EP 92810913A EP 0544624 A1 EP0544624 A1 EP 0544624A1
Authority
EP
European Patent Office
Prior art keywords
weft
cut
piece
reed
weft piece
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Withdrawn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
EP92810913A
Other languages
English (en)
French (fr)
Inventor
Masahiko KK Toyoda Jidoshokki Seisakusho 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 EP0544624A1 publication Critical patent/EP0544624A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
    • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
    • D03D51/085—Extraction of defective weft

Definitions

  • the present invention relates to an apparatus in a jet loom for removing from a cloth fell of woven fabric a weft piece which has been cut off an inserted weft due to a break in the weft and disposing of such cut-off weft piece.
  • the loom is brought to an automatic stop at a predetermined crank angle, and one end portion of a weft piece CY cut off the inserted weft is held in the apparatus while the other end portion thereof remains on a reed-beaten cloth fell. If the weft piece is short, however, the apparatus is moved together the slay when the loom is reversed to the above crank angle position and, therefore, the weft piece is pulled off the rollers PR in the apparatus before the loom is stopped. Under such a circumstance, the apparatus becomes unable to remove the cut-off, weft piece from the cloth fell.
  • an apparatus for disposing of a cut-off weft piece should be installed not on a movable slay, but on a stationary frame of the loom, that weft introducing means should be provided in facing relation to the entire path of the weft guide passage of the reed, and also that the apparatus should be so arranged as to receive properly a weft piece coming out from a shad a*t any time during weft inserting or beating operation of the loom and to hold the same weft piece securely.
  • the inventor has made the invention by providing.an apparatus which is capable of preventing a cut-off weft piece from being pulled off the apparatus thereby to ensure removal of the cut-off weft piece.
  • the present invention provides an apparatus of disposing of a weft piece in a jet loom, comprising: weft introducing means disposed on a stationary frame of the loom on the opposite side of a reed with respect to the side from which a weft is inserted and including an opening formed in correspondence with a path described by weft guide passage of the reed when it is swung back and forth, for introducing through said opening a weft piece cut off an inserted weft; weft detecting means for detecting said cut-off weft piece; and weft removing means including a pair of drive and follower rollers movable relative to each other and operable in response to an output signal from said weft detecting means to withdraw said cut-off weft piece.
  • the invention (second invention as recited in claim 2) provides an apparatus according to claim 1, further comprising suction means for drawing into said apparatus said cut-off w eft piece by suction.
  • a cutoff weft piece coming out at any time during the weft inserting or beating-up operation of the loom is receives and introduces by the weft introducing means into the appartus and, upon detection of the cut-off weft piece by the weft detecting means, the weft piece is held by a pair of rollers of the weft removing means to be pulled out from the cloth fell. Because the apparatus is fixed to a stationary frame of the loom, the relative position between the apparatus and the cutoff weft piece beaten to the cloth fell remains unchanged even when the reed is moved to its retracted position.
  • the suction means in addition to the above operations in the first invention, produces an air flow that acts on the cut-off weft piece to draw the same into the apparatus.
  • the weft piece held by the apparatus will not be released therefrom during the retracting movement of the reed, so that the weft piece can be removed from the cloth fell with certainty by the paired rollers of the weft removing means.
  • the weft introducing means generally designated by reference numeral 5 includes an elongated hole 50 which is used also as a guide slot for guiding the movement of a driven roller (or follower roller) 73.
  • reference numeral 1 designates a reed having a plurality reed wires each having a weft guide recess forming a weft guide passage of the reed with similar recesses formed in other reed wires.
  • Reference numeral 2 designates a weft feeler disposed in front of the reed 1 and numeral 3 a weft sensor, or double-weft feeler, located down-stream of the weft feeler 2 with respect to the direction in which the weft is moved for insertion.
  • An L-shaped guide member 4 which has a vertical portion 4A providing a guide plate and a horizontal portion 4B.
  • the guide plate 4A is fixedly mounted on a stationary frame 96 of the loom with the guide plate 4A thereof located slightly downstream of the sensor 3 and in a perpendicular relation to the reed 1.
  • the guide plate 4A is formed with a horizontally elongated hole 50 for receiving therethrough a cut-off weft piece CY.
  • the hole 50 has a length which is greater than the distance over which the weft guide passage of the reed 1 is moved by swinging motion of the reed (indicated by phantom lines), and a width which is greater than the opening dimension of the weft guide passage as seen in the cross section.
  • Reference numeral 7 designates weft removing means which inoludes a drive roller 71 rotatably supported by the horizontal portion 4B of the guide member 4 in alignment with the reed 1 when it is moved to its retracted position.
  • a drive motor 70 is provided at a slight distance from the roller 71, and pulleys 71P and 70P of the roller and the motor are interconnected via a belt '72 so that the roller 71 is driven to rotate by the motor 70.
  • the weft removing means 7 further includes a driven roller (or follower roller) 73 rotatably supported by one portion 74A of an L-shaped member 74 which is normally located at a position corresponding to the cloth fell of a woven fabric.
  • a guide roller 75 is supported by the L-shaped member 74 and arranged to be slidable along the elongated hole 50.
  • the member 74 is connected to an air cylinder 76 which is operated by air pressure supplied from a solenoid-operated valve 77 so that, when the valve is opened to actuate the air cylinder 76, the member 74 is moved toward the drive roller 71 until the driven roller 73 contacts its associated drive roller 71.
  • the movement of the member 74 is guided by the guide roller 75 sliding linearly along the elongated hole 50.
  • Reference numeral 8 designates suction means which includes a duct pipe 80 mounted on the other portion 74B of the L-shaped member 74.
  • the duct pipe 80 has an open inlet 81 facing downward an d a blow nozzle 82 connected to the duct pipe for blowing air in the longitudinal direction of the pipe (or downward as seen in FIG. 2) for producing suction adjacent the duct pipe inlet 81 to draw thereinto a cut-off weft piece.
  • the blow nozzle 82 is connected to a solenoid-operated valve 83 for controlling air supply to the blow nozzle.
  • valve 83 When the valve 83 is opened to blow air under pressure from the blow nozzia 82 into the duct pipe 80, a cut weft piece is drawn into the duct pipe 80 by suction and carried by air flow in the pipe to a trash box (not shown) for disposal of the weft piece.
  • a weft sensor 6 is provided in the inlet 81 of the duct pipe 80 for detecting a cut-off weft piece passing therethrough.
  • control 9 includes an I/O (input and output) device 91 connected to the sensors, motor and valves, a CPU 90, a ROM 92 storing therein a control program as shown in FIG. 5, a RAM 93, a keyboard 94 for inputting commands, and a display unit 95 fot displaying relevant information.
  • I/O input and output
  • the computer control 9 responding to the above weft-detected signal from the sensor 3 causes the valves 77 and 83 to be opened.
  • the cutoff weft piece CY is drawn into the duct pipe 80, as shown in FIG. 7, by suction produced adjacent the duct pipe inlet 81 by air flow directed into the duct pipe 80.
  • the weft sensor 6 transmits a weft-detected signal to the computer control 9, which in turn causes the motor 70 to rotate.
  • the driven roller 73 is moved into contact with its paired drive roller 71, the cut-off weft piece CY is nipped between the rollers and pulled out from the cloth fell to be drawn into the duct pipe 80.
  • This pulling of the weft piece by the rollers 71, 73 is continued until the entire weft piece is completely drawn into the duct pipe 80, i.e. until the sensor 6 detects a weft piece no more. If the sensor 6 continues to provide the weft-detected signal for more than a predetermined period of time, an alarm is activated.
  • the senor 6 transmits a weft-absence sllgnal to the control 9, which in turn causes the motor 70 to be stopped and the valves 77 and 83 to be closed thereafter.
  • the loom is restarted after threading the main nozzle (not shown) with a new weft extending from the weft measuring and storage drum by an automatic threading device (not shown) has been completed.
  • the cut-off weft piece CY can be introduced through the hole with certainty and it will not be pulled back during movement of the reed.
  • disposing of a cut-off weft piece can be accomplished with a high degree of success.
  • the cut-roff weft piece is pulled out from the cloth fell by the paired rollers 71, 73 which are then positioned adjacent the reed 1 in its retracted position, as shown in FIG. 8, and, therefore, the friction of the cut-off weft piece with warp yarns is reduced, the weft piece can be pulled easily away from the cloth fell.
  • the apparatus is fixed on a stationary frame of the loom, it is not subjected to harmful shock of impact and, therefore, no particular provision is necessary to ensure strength and durability of the apparatus.
  • the second embodiment differs from the first embodiment in that part of the control program stored in the ROM 92 is modified as illustrated in FIG. 9. That is, when a weft-break signal is generated by the weft sensor 3, the control 9 causes the valve 83 to be opened thereby to produce air flow in the duct pipe 80 prior to stopping the loom at 300° crank angle position. By so doing, the cut-off weft piece can be drawn into the duct pipe 80 during the stop or the subsequent reverse rotation of the loom. Thus, the weft piece can be prevented more effectively from being released from the apparatus during such motion of the reed.
  • the third embodiment differs from the first embodiment in that a guide plate having formed therein an elongated hole 51 is added to the arrangement of the first embodiment.
  • the hole 51 is formed wider and in an arcuate shape conforming t6 the path along which the weft guide passage of the reed 1 is moved by swinging motion of the reed and the inner peripheral surface 52 of the elongated arcuate hole 51 is tapered to be convergent. in the weft introducing direction.
  • This modification of the third embodiment can make it easier for a cut-off weft piece to be introduced through the elongated hole 51.
  • the elongated hole 50 in this embodiment serves mainly as a guide for the L-shaped member 74.
  • the duct pipe inlet 81 is located at the leading end of the L-shaped member 74, an inlet through which a weft piece is drawn by suction may be formed in the leading end of the member 74.
  • the driven roller 73 is movable by the air cylinder 76 toward the drive roller 71
  • the arrangement of the two rollers may be changed or the drive roller 71 may be adapted to be movable toward the other roller.
  • the apparatus comprises weft introducing means 1 disposed on a stationary frame 96 of the loom on the opposite side of the reed I with respect to the side from which a weft is inserted and including an elongated hole 50 formed in correspondence with a path described by weft guide passage of the reed 1 when it is swung back and forth, for introducing through said hole 50 a weft piece CY cut off an inserted weft, a waft sensor 6 for detecting the cut-off weft piece, weft removing means 7 including a pair of drive and follower rollers 71 and 73 for withdrawing the cut-off weft piece, and suction means 8 for drawing and discarding the cut-off weft piece by suction.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP92810913A 1991-11-28 1992-11-25 Vorrichtung zum Beseitigen von abgebrochenen Schussfadenstücken in einer Luftwebmaschine Withdrawn EP0544624A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3340295A JP2988497B2 (ja) 1991-11-28 1991-11-28 ジェットルームの緯糸処理装置
JP340295/91 1991-11-28

Publications (1)

Publication Number Publication Date
EP0544624A1 true EP0544624A1 (de) 1993-06-02

Family

ID=18335582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810913A Withdrawn EP0544624A1 (de) 1991-11-28 1992-11-25 Vorrichtung zum Beseitigen von abgebrochenen Schussfadenstücken in einer Luftwebmaschine

Country Status (2)

Country Link
EP (1) EP0544624A1 (de)
JP (1) JP2988497B2 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0236597A1 (de) * 1986-03-11 1987-09-16 Tsudakoma Corporation Einrichtung zur Entfernung eines fehlerhaften Schussfadens bei einem schützenlosen Webstuhl
EP0332258A1 (de) * 1988-03-10 1989-09-13 Picanol N.V. Verfahren zum Entfernen eines losen Stückes eines falschen Schussfadens aus dem Fach einer Webmaschine
EP0421511A1 (de) * 1989-10-04 1991-04-10 Picanol N.V. Verfahren und Vorrichtung zur Zufuhr von Schussfäden an das Webfach einer Luftwebmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0236597A1 (de) * 1986-03-11 1987-09-16 Tsudakoma Corporation Einrichtung zur Entfernung eines fehlerhaften Schussfadens bei einem schützenlosen Webstuhl
EP0332258A1 (de) * 1988-03-10 1989-09-13 Picanol N.V. Verfahren zum Entfernen eines losen Stückes eines falschen Schussfadens aus dem Fach einer Webmaschine
EP0421511A1 (de) * 1989-10-04 1991-04-10 Picanol N.V. Verfahren und Vorrichtung zur Zufuhr von Schussfäden an das Webfach einer Luftwebmaschine

Also Published As

Publication number Publication date
JP2988497B2 (ja) 1999-12-13
JPH05195379A (ja) 1993-08-03

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