US3603353A - Method of and apparatus for weaving without knots - Google Patents

Method of and apparatus for weaving without knots Download PDF

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Publication number
US3603353A
US3603353A US802432A US3603353DA US3603353A US 3603353 A US3603353 A US 3603353A US 802432 A US802432 A US 802432A US 3603353D A US3603353D A US 3603353DA US 3603353 A US3603353 A US 3603353A
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United States
Prior art keywords
yarn
fault
weft yarn
shed
thickness
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Expired - Lifetime
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US802432A
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English (en)
Inventor
Eduard Glass
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ETAG TEXTILWERKE GmbH
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ETAG TEXTILWERKE GmbH
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    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/342—Handling the weft between bulk storage and weft-inserting means knot detection
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02H—WARPING, BEAMING OR LEASING
    • D02H5/00—Beaming machines
    • D02H5/02—Beaming machines combined with apparatus for sizing or other treatment of warps
    • 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

  • This invention relates to methods of and apparatus for weaving fabric and is particularly concerned with methods of and apparatus for weaving a knot-free fabric from a continuously fed weft yarn which may include thickness faults such as knots and other thickness abnormalities.
  • Another object of the invention is to completely avoid the introduction of knots in weaving machines in which the weft yarn is drawn from stationary bobbins so that the fabric obtained has no knots'while at the same time obviating the foregoing disadvantages of increased cost with respect to time, costof time and wasted weft yarn.
  • a portion of the weft yarn which bears a knot or other abnormality is introduced into the shed formed by the warp yarn and the weaving machine is stopped before the weft is beaten up to compact the fabric.
  • the weft yarn is then cutoff on the empty side and theinserted weft yarn portion bearing the knot or abnormality is removed from the shed.
  • the weaving machine can be restarted either immediately or after resetting the machine for repeating the weave, depending upon the fabric weave, whereupon the next weft yarn and all the subsequent weft yarns will be woven in normally in that the weft yarn remains in its delivery position with respect to the feed device on the entry side of the shed and only the normal weft yarn length extending through the fabric is removed.
  • the arrangement for controlling the provision of a knot-free fabric comprises means for detecting an abnormality in the continuously fed weft yarn as the yarn is being delivered to the machine and means for automatically stopping the machine after the required length serted into the shed, but prior to beating up of the weft yarn and before changing of the shed.
  • a signal device is advantageously provided to be actuated by the detecting means for alerting the machine minder that an abnormality has been positioned in the shed.
  • the machine minder can then manually remove the inserted length of weft yarn and if necessary restore the wave repeat controls and restart the weaving machine.
  • means are provided whereby the faulty length of yarn is automatically removed in response to a positive indication of an abnormality by the detecting means so that the machine minder is only required to reset and restart the machine.
  • the signal device is also provided for alerting the machine minder at a remote location that an abnormality of a weft yarn has been positioned in a shed.
  • the signal device is operated by or in response to the knot detection apparatus.
  • a particularly advantageous embodiment of the invention includes a control device which receives a control pulse from the knot detection apparatus and operates to stop the weaving machine at a prescribed time delayed sufficiently to permit full insertion of the faulty length of weft yarn, actuate a device for removing the inserted weft yarn and, depending on the type of weave, restores the wave repeat and subsequently restarts the weaving machine.
  • a control device which receives a control pulse from the knot detection apparatus and operates to stop the weaving machine at a prescribed time delayed sufficiently to permit full insertion of the faulty length of weft yarn, actuate a device for removing the inserted weft yarn and, depending on the type of weave, restores the wave repeat and subsequently restarts the weaving machine.
  • optical and/or acoustic signal apparatus is provided for signalling the machine minder in response to operation of the knot detecting apparatus so that a machine minder may be alerted to the inoperative condition of the weaving machine even though he may be some distance from the machine.
  • one or more additional knotdetecting devices may be provided in the region of the weft yarn portion introduced into the shed and be so coupled to the control unit that when a fault occurs the detectingdevices are operable to stop the control unit and the weaving machine on removal of the weft yarn.
  • the knot On withdrawal of the inserted weft yarn the knot may in fact open up or the yarn may break while the remaining weft yarn will stain the fabric and would result in a fault therein.
  • additional knot detection devices are provided, of which at least one is provided on the entry end between the shears and the fabric edge, on withdrawal of the weft yarn at the outlet end, this particular knot-detecting device would indicate that yarn still remains in the fabric in the event that the knot opens or that the yarn breaks on withdrawal.
  • the alarm signal By employing such device or devices in conjunction with the control unit, the alarm signal would remain effective so that the machine minder is again alerted and can clear the fault.
  • a normal weaving knot has the thickness of approximately four courses of yarn at its thickest point.
  • the knot-detecting apparatus employed may therefore include photoelectric dc tecting apparatus which responds to thick zones of yarn, however, other types of knot-detecting apparatus may be employed.
  • the knot-detecting apparatus comprises a pivotal fork having a slot corresponding to the thickness of the weft yarn.
  • the weft yarn is disposed to run through the slot during delivery thereof to the weaving machine.
  • the appearance of a knot or other thick zone in the yarn pivots the fork out of its normal resting positions whereby the fork closes an electrical contact or a mechanical device for stopping the machine or signalling a control unit for stopping the machine and energizing an alarm apparatus.
  • the fork is particularly advantageous for the fork to be disposed interchangeably on a pivoting arm so that the fork can be adapted to any desired thickness of weft yarn.
  • Apparatus for removing the faulty inserted weft yarn may, for example, employ a small rotating rough roller which can be moved into contact with the weft yarn at the opposite end of the shed and which mechanically or electrostatically engages and coils up the weft yarn.
  • a lever with a hook system which draws the weft yarn from the shed in the form of a loop.
  • the particular arrangement illustrated herein employs a suction nozzle disposed at the exit end of the shed which is connected to a source of vacuum and which is brought into fluid communication with the source of vacuum by means of a valve which is operable in response to the detection of a faulty length of weft yarn.
  • the removal of the portion of the weft yarn bearing the knot can be carried out in a few seconds from the time the knot is detected until the machine is restarted so that the weaving machine efficiency with the method according to the present invention is substantially the same as if the same fabric were being woven while permitting the inclusion of knots.
  • the total efficiency to produce knot-free fabric is considerably increased both in production time and in cost when compared to techniques heretofore employed to clear knots from a woven fabric or to prepare bobbins for weaving knot-free fabric.
  • FIG. 1 is a pictorially illustrated diagrammatic representation of apparatus for weaving knot-free fabric in accordance with the principles of the invention.
  • FIGS. 2, 3 and '4 illustrate one particular form of knot-detecting apparatus which may be employed in practicing the invention and which is also illustrated as a portion of the apparatus of FIG. 1.
  • a pair of stationary weft yarn bobbins l and 2 are illustrated for supplying a continuous strand of weft yarn 4 to a weaving machine 11 through a yarn guide 5, a yarn brake 6, knot-detecting apparatus 7, feed device and yarn shears 8.
  • the feed device 10 is a reciprocating gripping device for use with, in this example, a gripper shuttle type of loom, which feed device 10 is operable in the directions indicated by the double headed arrow.
  • the yarn shears 8 are disposed between the feed device 10 and the weaving machine 11 and are operable after each weft yarn insertion to sever the inserted portion 4 of the web yarn from the continuous weft yarn strand 4.
  • the open shed of the warp yarns is indicated on the weaving machine 11 by the two cloned lines 12 which symbolize the cross section through the warp yarns.
  • a suction nozzle 13 is provided beneath the righthand end of the portion 4' that has already been inserted into the shed l2, i.e. on the exit side of the shed, and is connected to a vacuum source via a remotely controlled valve 17.
  • the vacuum source takes the form of a collector unit 14 with a filter strainer and a suction fan 15 connected in fluid communication therewith.
  • An existing yarn breakage suction system or the like may be employed as the vacuum source if desired.
  • FIG. 1 it has been assumed that a knot 9 has actuated the knot detector 7 and then, born by the portion 4' of the weft yarn, has entered the open shed of the warp yarns 12.
  • the particular knot detector illustrated includes an upperwardly extending fixed arm 26 having a yarn guide nozzle or aperture 18 therein for passing the continuous strand of weft yarn 4 and a vertical base plate 23 supporting the extending arm 26.
  • the actual stop motion element of the knot detector is illustrated in the form of an elongate member having a forked end 7, the slot of the fork being of particular dimensions with respect to the weft yarn being woven.
  • the elongate element carrying the forked end 7 is secured to an arm 19 by means of a locking screw 27, the arm 19 being pivotally carried by base plate 23 by a pivot 20.
  • the pivoting arm 19 In the normal vertical position, the pivoting arm 19 is subject to the action of a restoring spring 25 connected between the elongate fork member 7 and the base plate 23 and thus bears against a setscrew 24 which is provided with a locknut.
  • an adjustable contact screw 21 also provided with a locknut, for actuating an electrical contact device 22 which is carried by and insulated from the base plate 23.
  • the electrical signal may perform these functions through the medium of a control circuit 16 which is illustrated as being mounted on the machine II and which would include the necessary apparatus for delaying the inactivation of the machine a sufficient time to permit complete insertion of the faulty portion of the weft yarn into the shed. Such time delay, however, would not extend to permit beating up the faulty yarn to compact the fabric.
  • This delay interval may also be effected, or partially effected, by the adjustment of setscrews 21 and 24 to provide adjustment of a permissible swing of the pivoting elements 7, l9 and 211 about pivot point 20.
  • the arm H9 can be adapted to any particular thickness of yarn desired, as hereinbefore mentioned.
  • control unit 16 may be constructed to cause energization of the alarm device 28, in this case a lamp, and to also place the weaving machine in an off condition. This action may be provided by a time control relay which is effective at a time when the weft yarn portion 4 bearing the knot 9 has completely entered the shed, but has not yet been beaten up. After the weaving machine has been stopped, the control unit 16 is constructed to open the valve 17 for a short period whereby the nozzle 13 sucks in the faulty weft yarn end and thus sucks the weft yarn portion 4' including the knot 9 out of the shed 12.
  • the control unit 16 is constructed to restart the weaving machine by means of the known starting system (not shown) whereupon the control unit is reset and the alarm device 28 is turned off. The weaving machine will then continue to operate in the proper manner.
  • the weaving machine may be stopped in the same manner by the knot-detecting apparatus and the alarm device 28 or other signals may be switched on,
  • This alternative approach is illustrated in FIG. 1 by the switch circuit 30 which receives inputs A and B from the detecting apparatus and is symbolically connectable to the alarm zip paratus Ml by switch 31 and to machine llll by switch 32.
  • the switching circuit may comprise any suitable structure, for example relays, for effecting the desired control of the machine Ill and the alarm device 28.
  • the machine minder may then manually withdraw the inserted faulty weft yarn, set the wave repeat where required and restart the machine.
  • the control unit may be constructed for a simple control cycle and in a well-known manner it may comprise electrical contactor, a time relay and possible a servomotor. As shown in FIG. 1, the control unit 16 may be disposed on the loom itself, or it may be placed at some other suitable location, e.g. in or on the creel.
  • knot-detecting devices such as 7a and 7b, positioned on the delivery and exit sides of the shed.
  • the knot may in fact open or the yarn may break leaving undesired weft yarn in the fabric which would result in a fault.
  • one or more knot detectors are provided, at least one being provided at the entry and between the shears and the fabric edge, a yarn stop signal would be generated to account for an additional amount immediately following a knot which has already triggered shutdown of the machine.
  • a knot detection device may be employed to indicate complete withdrawal of the weft yarn so that a broken segment of yarn will not remain in the fabric.
  • the control unit 16 would accordingly be provided with additional inputs C, D. E and F for controlling the operation thereof and may include circuit apparatus which would not permit resetting of the control unit and alarm device until the shed has been completely cleared of faulty weft yarn.
  • the improvement for providing fabric which is free of thickness faults in the weft yarn comprising the steps of detecting thickness faults in the weft yarn during delivery thereof to the machine, deactivating the machine only after complete insertion of and prior to beat ing of a fault-bearing length of weft yarn within a shed in response to the detection of the fault, and withdrawing the fault-bearing length of weft yarn from the shed.
  • step of withdrawing the fault-bearing length is further defined as applying a vacuum to the fault-bearing length for removing it from the shed.
  • step of detecting thickness faults is further defined as comparing the thickness of yarn being delivered to the machine with a predetermined thickness.
  • step of detecting thickness faults is further defined as generating fault-indicating signals upon detection of a yarn thickness greater than the predetermined yarn thickness.
  • a method of weaving fault-free fabric from a supply of warp yarn and a supply of weft yarn in the form of an endless fault-bearing strand comprising the steps of cyclically forming sheds of warp yarn for receiving the weft cyzlically inserting the leading portion of the endless strand of weft yarn fully into a formed shed,
  • a machine for weaving fabric from a supply of weft yarn bearing thickness faults therein from a supply of warp yarn comprising means repeatedly forming sheds from said warp yarn, means for inserting a predetermined length of weft yarn including faults therein into a formed shed, means for cutting the predetermined length of weft yarn from the supply of weft yarn, fault-detecting means disposed between the supply of weft yarn and the shed forming means for sensing thickness faults in the weft yarn, said fault-detecting means including means for generating fault indicative signals, means for controlling on and off conditions of the machine coupled to said detecting means and operable in response to fault-indicative signals to place the machine in an off condition at the moment when a fault-bearing length of weft yarn is completely introduced into the shed.
  • the weaving machine according to claim 6 comprising means coupled to said fault-detecting means and operable in response to fault-indicative signals to withdraw fault-bearing lengths of weft yarn from the formed sheds.
  • said means for withdrawing a fault-bearing length of yarn from a shed comprises a source of vacuum, a nozzle connected to said source of vacuum and disposed adjacent the shed area, and a control valve interposed between said source of vacuum and said nozzle for controlling the application of a vacuum to a fault-bearing length of weft yarn.
  • said fault-detecting means comprises means for detecting the withdrawal of a faulty length of yarn from a shed.
  • said means for detecting withdrawal of a faulty length of yarn from a shed comprises a plurality of detecting means disposed adjacent each end of a formed shed.
  • said fault-detecting means comprises a fixed base member, electrical contacts carried by said base and connected to said condition controlling means, a movable member pivotally mounted to said base member including means forming a fork at one end thereof loosely embracing said weft yarn and dimensioned to pass only yarn of a thickness which is less than a predetermined value, said movable member pivoted by yarn thickness greater than the predetermined value to operate said electrical contacts.
  • said detection means comprises spring means connected between said fixed base member and said movable member to bias said movable member toward said fixed member.
  • said detection means comprises means secured to said movable member for contacting and operating said electrical contacts and means for adjusting the degree of motion required of said movable member to operate said electrical contacts.
  • said movable member includes means for releasably securing thereto said means forming said fork so that the detecting means may be adapted to operate with respect to various yarn thicknesses.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US802432A 1968-02-28 1969-02-26 Method of and apparatus for weaving without knots Expired - Lifetime US3603353A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH287868A CH488834A (de) 1968-02-28 1968-02-28 Verfahren und Webmaschine zum knotenfreien Weben

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US3603353A true US3603353A (en) 1971-09-07

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US802432A Expired - Lifetime US3603353A (en) 1968-02-28 1969-02-26 Method of and apparatus for weaving without knots

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US (1) US3603353A (de)
CH (1) CH488834A (de)
DE (1) DE1904584B2 (de)
FR (1) FR2002769A1 (de)
GB (1) GB1209587A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57183445A (en) * 1981-05-06 1982-11-11 Asahi Shiyueeberu Kk Production of glass cloth not weaving splice part of weft yarn
JPS5966540A (ja) * 1982-10-02 1984-04-16 株式会社豊田自動織機製作所 無杼織機における緯糸欠点織込み防止方法
WO2009030196A1 (de) * 2007-09-06 2009-03-12 Lindauer Dornier Gesellschaft Mbh Verfahren und vorrichtung zum eliminieren von schussfäden mit fadenunregelmässigkeiten aus geweben
EP2175058A1 (de) * 2008-10-10 2010-04-14 Gebrüder Loepfe AG Webmaschine mit Garnqualitätssensor
CN103105122A (zh) * 2012-12-10 2013-05-15 金捷 一种编织点堆线检测机
CN103487841A (zh) * 2013-09-04 2014-01-01 成都瑞克西自动化技术有限公司 结头断带感应装置
CN103523599A (zh) * 2013-10-29 2014-01-22 东莞市大忠电子有限公司 一种电线打结检测仪
US11346023B2 (en) * 2019-07-26 2022-05-31 Claire E. Harvey Fully-formed volumetrically woven article

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL146551B (nl) * 1971-06-10 1975-07-15 Strake Maschf Nv Besturingsinrichting voor het herstellen van weeffouten bij een weefmachine van het type, waarbij de inslag plaatsvindt met behulp van een stromend medium door een hoofdblaasmondstuk en een aantal tussen de weefvakeinden opgestelde hulpblaasmondstukken.
KR860002101B1 (ko) * 1982-05-11 1986-11-25 가부시기 가이샤 도요다 지도우 쇽기세이사꾸쇼 젯트직기에 있어서 위사처리방법 및 그 장치
NL8202215A (nl) * 1982-06-01 1984-01-02 Rueti Te Strake Bv Spoelloze weefmachine, voorzien van middelen voor het uit het weefvak verwijderen van defecte inslagdraden.
US4502512A (en) * 1982-07-21 1985-03-05 Seisakusho Kabushiki Kaisha Toyoda Jidoshokki Method for treating a weft yarn upon stoppage of a shuttleless loom and device for effecting the same
CS267634B1 (en) * 1987-12-02 1990-02-12 Sedlicky Vaclav Connection for incorrectly connected weft's automatic removal checking with looms
DE4209686C2 (de) * 1992-03-25 1995-02-02 Dornier Gmbh Lindauer Verfahren und Vorrichtung zur Herstellung von insbesondere knotenfreien Gewebe auf Luftdüsenwebmaschinen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2329427A (en) * 1943-02-06 1943-09-14 Stop Motion Devices Corp Stop motion device
DE915848C (de) * 1942-07-09 1954-07-29 Elite Diamant G M B H Fadenbruch- und Knotensicherung an Strickmaschinen, insbesondere an Flachstrickmaschinen
US2841186A (en) * 1955-04-25 1958-07-01 Warner Swasey Co Filling detector for a weaving machine
US2918946A (en) * 1955-12-29 1959-12-29 Sulzer Ag Filling or weft thread detection in weaving machines
US3147778A (en) * 1960-05-30 1964-09-08 Reyes Juan Vila Device for cutting the filling in shuttleless looms with stationary filling reserve
US3225794A (en) * 1963-01-12 1965-12-28 Alsacienne Constr Meca Weaving frame having improved weft trimming means
CH437163A (de) * 1965-05-28 1967-05-31 Sulzer Ag Schussfadenwächter an einer Greiferschützenwebmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE915848C (de) * 1942-07-09 1954-07-29 Elite Diamant G M B H Fadenbruch- und Knotensicherung an Strickmaschinen, insbesondere an Flachstrickmaschinen
US2329427A (en) * 1943-02-06 1943-09-14 Stop Motion Devices Corp Stop motion device
US2841186A (en) * 1955-04-25 1958-07-01 Warner Swasey Co Filling detector for a weaving machine
US2918946A (en) * 1955-12-29 1959-12-29 Sulzer Ag Filling or weft thread detection in weaving machines
US3147778A (en) * 1960-05-30 1964-09-08 Reyes Juan Vila Device for cutting the filling in shuttleless looms with stationary filling reserve
US3225794A (en) * 1963-01-12 1965-12-28 Alsacienne Constr Meca Weaving frame having improved weft trimming means
CH437163A (de) * 1965-05-28 1967-05-31 Sulzer Ag Schussfadenwächter an einer Greiferschützenwebmaschine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57183445A (en) * 1981-05-06 1982-11-11 Asahi Shiyueeberu Kk Production of glass cloth not weaving splice part of weft yarn
JPS5966540A (ja) * 1982-10-02 1984-04-16 株式会社豊田自動織機製作所 無杼織機における緯糸欠点織込み防止方法
WO2009030196A1 (de) * 2007-09-06 2009-03-12 Lindauer Dornier Gesellschaft Mbh Verfahren und vorrichtung zum eliminieren von schussfäden mit fadenunregelmässigkeiten aus geweben
EP2175058A1 (de) * 2008-10-10 2010-04-14 Gebrüder Loepfe AG Webmaschine mit Garnqualitätssensor
CN103105122A (zh) * 2012-12-10 2013-05-15 金捷 一种编织点堆线检测机
CN103487841A (zh) * 2013-09-04 2014-01-01 成都瑞克西自动化技术有限公司 结头断带感应装置
CN103487841B (zh) * 2013-09-04 2016-06-29 成都瑞克西自动化技术有限公司 结头断带感应装置
CN103523599A (zh) * 2013-10-29 2014-01-22 东莞市大忠电子有限公司 一种电线打结检测仪
US11346023B2 (en) * 2019-07-26 2022-05-31 Claire E. Harvey Fully-formed volumetrically woven article
US20220403567A1 (en) * 2019-07-26 2022-12-22 Claire E. Harvey Fully-formed volumetrically woven article
US12157960B2 (en) * 2019-07-26 2024-12-03 Claire E. Harvey Fully-formed volumetrically woven article

Also Published As

Publication number Publication date
DE1904584B2 (de) 1971-11-25
CH488834A (de) 1970-04-15
DE1904584A1 (de) 1969-09-18
FR2002769A1 (de) 1969-10-31
GB1209587A (en) 1970-10-21

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