US3908707A - Device for the delivery of predetermined weft lengths in a shuttleless weaving machine - Google Patents

Device for the delivery of predetermined weft lengths in a shuttleless weaving machine Download PDF

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Publication number
US3908707A
US3908707A US426557A US42655773A US3908707A US 3908707 A US3908707 A US 3908707A US 426557 A US426557 A US 426557A US 42655773 A US42655773 A US 42655773A US 3908707 A US3908707 A US 3908707A
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United States
Prior art keywords
yarn
weft
buffer reservoir
blowing nozzle
conveyor
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Expired - Lifetime
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US426557A
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English (en)
Inventor
Gerardus Hendrikus Kaalverink
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Rueti Te Strake BV
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Rueti Te Strake BV
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Application filed by Rueti Te Strake BV filed Critical Rueti Te Strake BV
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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
    • 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
    • D03D47/36—Measuring and cutting the weft
    • D03D47/368—Air chamber storage devices

Definitions

  • ABSTRACT Jaudon Attorney, Agent, or Firm-Marshall & Yeasting [5 7 ABSTRACT A device for the delivery of predetermined weft lengths through the weft conveyor of a shuttleless weaving machine, provided with means for drawing the weft yarn from a yarn cop and supplying it to an air operated buffer reservoir of the type which is adapted to form a reserve loop out of the yarn supplied, a thread clamp being provided between the buffer reservoir and the weft conveyor in the path of the reserve loop leg extending from the buffer reservoir to the weft conveyor, wherein the buffer reservoir cooperates with at least one thread detector controlling the yarn drawing means.
  • the invention relates to-a 'device'fonthe delivery of the thread clamp respond very accurately and to a large redetermined weft lengths, through the'weft conveyor" )uffer reservoir and the weftconveyor in. the-path of I he reserve-loop leg extending from-the buffer reservoir 0 the weft conveyor.
  • the device according to the invention is characterzed in that the buffer reservoir cooperates with at least" me thread detector controlling the yarn drawing neans.
  • the yarn drawing means are notcontinuouslyoperlting, but are only energized after the loop length, pres- :nt in the buffer reservoir, has decreased to less than he maximum loop length corresponding with the posiion of the thread detector, and remain operative until he loop length in. the buffer reservoir has again in-' :reased to the length determined by the position of the hreaddetector. Adecrease in the loop length present n the buffer reservoir is effected each time when the hread clamp opens and the weft conveyor is permitted 0 draw yarn from the buffer reservoir.
  • the weft conveyance and therefore the opening vnd closing of the thread clamp may take place accordng to any desired program.
  • the device according ,to he invention is therefore also particularly suitable for .pplication to weaving with different colors. Then for extent reproducably to-the sig'nal'emitted by theweft detector.
  • it is'adv'antageousto' use a yarn clamp of the type described in Dutch patent apple cation 7217620, corresponding'to' US. patent application Ser.-N0. 426,79-8,' fi'led Dec. 20, 1973';
  • Yarn drawing means of different types'ma'y be used in the device according to the inv entionflt is advanta geous to use a yarn drawing device'of 'the' type' de scribed'in US. Pat No. 3,853, l53namely by'directing that yarn drawing 'devicewith its output side towards" the entrance of the'buffer reservoir.
  • the yarn brake is likewise constituted by a blowing nozzle, the blowingdirec'tion" to that'of theyarn draw-blowing thereof being opposite nozzle.
  • FIG. 1 is a schematic the invention.
  • FIG. 2 is the wiring diagram thereof:
  • FIG..3 is a perspective view of a preferred vice according to the invention.- 1
  • FIG. 4 is a sectional view of a preferred form of yarn" I clamp for use ina device according to'the invention.
  • reference number 1 indicates a buffer reservoir, e.g. inthe formof asuction tube
  • reference number 2 indicates a weft inserting jet or yarn conveyor in the form of a blowing nozzle
  • reference number 3 a thread clamp positioned between this blowing nozzle and the buffer reservoir 1;
  • the 5 thread clamp .3 may vbeof any conventional construe;
  • the thread clamps of these devices may hen be controlled corresponding to the desired color attern, the opening being e.g., carried out by a control ssembly programmed corresponding to the desired left pattern, and thereclosing occurringunder the ontrol of a weftdetector positioned in the weaving bed.
  • the stationary clamping jaw 21 is secured through a. rubber block 23 to'a projecting tread clamp between the buffer reservoir and the weft onveyor.
  • part 25 of a housing 24 to. be mounted-stationary, eLgi, on the-frame ofa weaving machine.
  • the movable clamping jaw 22 is secured to the one end of a lever 26, preferably made from a light material, such. as aluminum, whichiis pivotally connected at its other end to the housing 24.
  • the pivot connection is constituted by a leaf spring 27which is somewhat biased, namely so that the spring tends to rotate the lever clockwise as seen in the drawing.
  • An electric coil, indicated with the reference number 28, is preferably coiled to the shape of a flat spiral and is received in a bridge piece 29, preferably made of plastic, extending over the housing 24 and secured thereto.
  • the lever 26 extends below the bridge piece 29 and comprises at the position of the coil 28 a disc 30, e.g., of aluminum, which is suitable for induction therein of eddy currents when a current pulse is sent through the coil 28, In the open position of the yarn clamp, shown in the drawing, the lever 26 with the disc 30 is kept by the biased spring 27 against the coil 28.
  • the lever 26 At its lower side the lever 26 supports a second disc or block 31 of ferromagnetic material, which cooperates with the armature 33 of an electromagnet 32 mounted in the housing 24.
  • the described thread clamp operates as follows:
  • a current pulse supplied to the coil 28 results in that a large downwardly directed acceleration force is imparted to the disc 30, which force moves the lever 26 very quickly to the closing position. If now simultaneously with energizing the coil 28 the electromagnet 32 is energized, the lever 26 is thereafter kept in its closed position during the energization time interval of the electromagnet in that the ferromagnetic disc 31 is attracted by the electromagnet armature 33.
  • a yarn drawing device 4 in the form of a blowing nozzle, which is adapted ,to draw the weft yarn from the yarn cop when supplied with blowing air, in order to supply this yarn to the buffer reservoir 1 in which the yarn nestles in the shape of a loop L under the influence of the air flow I generated in the reservoir.
  • the blowing nozzle 4 is of conventional construction, and consists of a converging annular passageway 4a into which compressed air is introduced so as to inject a converging jet of air into an outlet 4b.
  • the thread which extends freely through the blowing nozzle 4, coincides with the axis of the nozzle, and is propelled along the axis of the nozzle by the action of-the jet of air.
  • a yarn brake 6 likewise in the form of a blowing nozzle, constructed in the same manner as the blowing nozzle 4, is indicated between the yarn draw-blowing nozzle 4 and the yarn cop 5, the purpose and the operation of which will be explained hereunder in detail.
  • the buffer reservoir 1 cooperates with a thread detector 7 comprising a light source 8, e.g., a Ga-As diode, and a light sensitive element, e.g., a light sensitive resistance or photodiode 9.
  • the thread detector 7 is so positioned longitudinally of the buffer reservoir 1, that a length of the loop L, corresponding with this position, provides the yarn length which it is desired to have ready in the buffer reservoir at the moment at which the weft conveyor 2 has to start carrying out a weft inserting phase.
  • the air valve 10 is a conventional two-way solenoid-operated air distributing valve.
  • the light sensitive element 9 is receiving a reduced amount of light, and the amplifier 12 is designed in the conventional manner so that under such conditions it does not supply a sufficient amount of current to energize the solenoid of the valve 10.
  • the air valve 10 In the position shown of the air valve 10 the air supply to the yarn draw nozzle 4 has been interrupted whereas the supply to the blowing nozzle 6 is open.
  • the yarn loop L is at rest in this situation, in that the blowing nozzle 6 supplies sufficient resistance to prevent the air flow I from drawing yarn from the yarn cop 5, although the blowing nozzle 6 does not have sufficient powerto draw the yarn backward out of the reservoir 1.Thus the legs of said loop are kept taut by the operation of the air flow I and of the blowing nozzle 6 acting as a yarn brake or yarn clamp.
  • This yarn loop is ready to be taken up by the weft conveyor, as soon as a weft inserting phase is desired, from the buffer reservoir 1 and to be conveyed through the weaving shed.
  • the signal for this weft inserting phase is e.g., given by an electrical picking control which has been programmed according to the desired weft pattern, which signal opens the thread clamp 3.
  • the start of the operation of the weft conveyor 2 results in that the end of the yarn loop L arrives to the left of the thread detector 7, whereby the light sensitive element 9 receives the undiminished light beam emitted by the light source 8 and (see the diagram according to FIG. 2) issues a signal which is supplied to the solenoid 10 via an amplifier 12, whereby said solenoid receives a sufficient amount of current so that it moves the two-way valve from the position shown in full lines in FIG. 1 to the position shown in broken lines, in which position the blowing air supply to the blowing nozzle 6 is interrupted and that to the yarn draw nozzle 4 is opened.
  • FIG. 3 shows a weft detector, positioned at the end of the weaving shed, which like the thread detector 7 consists of a light source 8a and a light sensitive element 9a.
  • FIG. 3 A yarn drawing device of that type is shown in FIG. 3, in which an electromotor 41 of the quick response type, e.g., a motor having a bell-shaped or disc-shaped armature, is mounted to one side of a motor support 42 seplied with air through a conduit schematically indi-' cated at 47.
  • the weft blowing nozzle 2 has a tubular discharge section 20 facing the opening of the weaving shed 13 delimited by the upper andlower warp threads 50 and 51 respectively and by the retracted reed 52.
  • a pneumatic yarn control assembly 48 likewise carried by the motor support 42, is supplied with air through the schematically indicated conduit 49.
  • this control assembly comprises a yarn-take-off injector and a braking injector known per se.
  • the solenoid valve When the solenoid valve is energized as hereinbefore described, the valve 10 will cause the supplied air to be bypassed to the left through the tubular injector 4, as a result of which suction is generated at the injector 4 to draw weft yarn from the cop 5.
  • the supplied air Upon deenergization of the solenoid valve 10, the supplied air will flow out through the braking injector 6 and thereby exert a braking force directed to the right on the weft yarn.
  • the weft yarn w extending from the left end of the yarn control assembly 48 in tangential relationship to the disc 45 is wound several times around the circumferential surface of this disc and then is directed toward the entrance of the buffer reservoir 1 as hereinbefore described.
  • a guide element cooperating with the disc 45 keeps the yarn coils mutually separated.
  • the weft yarn leaving the buffer reservoir 1 in FIG. 3 extends through a thread clamp (which is hidden in FIG. 3) to the tubular inlet 2b of the weft inserting nozzle 2.
  • the weft conveyor is permitted to draw weft yarn from the buffer reservoir.
  • the weft inserting conveyor 2 has been considered to be supplied continuously with compressed air, as described in patent No. 3,853,153, so that the starting and stopping of the weft insertion is controlled entirely by the opening and clos ing of the yarn clamp 3.
  • the conventional practice of supplying air to the weft inserting nozzle 2 only during the weft inserting operation may be followed, using the signals which maintain the yarn clamp 3 open to simultaneously maintain the supply of compressed air to the weft inserting nozzle 2.
  • a device for supplying weft yarn to a weft conveyor of a shuttleless weaving machine comprising a. intermittently operable means for drawing weft yarn from a yarn cop,
  • an elongated buffer reservoir having at one end a mouth to which weft yarn is fed by said yarndrawing means and in which a length of the yarn is stored in the form of a loop having one leg extending from the buffer reservoir to the weft conveyor,
  • a yarn detector arranged to detect the end of said loop in the buffer reservoir at a point remote from the mouth thereof
  • l f. a control which is actuated by the yarn detector and which renders the yarn-drawing means inoperative when yarn is detected and operative when yarn is not detected, in order to cause the length of yarn in the buffer reservoir to be restored after yarn has been withdrawn from the buffer reservoir.
  • the yarndrawing means comprises a blowing nozzle the air supply of which is turned on by said control when yarn is not detected by the yarn detector.
  • a device characterized in that the yarn draw-blowing nozzle is preceded by a yarn brake, and the control actuated by the yarn detector renders said brake operative when yarn is detected and inoperative when yarn is not detected.
  • a device characterized in that the yarn brake is likewise constituted by a blowing nozzle, the blowing direction thereof being opposite to that of the yarn draw-blowing nozzle.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US426557A 1972-12-22 1973-12-20 Device for the delivery of predetermined weft lengths in a shuttleless weaving machine Expired - Lifetime US3908707A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7217617A NL7217617A (enrdf_load_stackoverflow) 1972-12-22 1972-12-22

Publications (1)

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US3908707A true US3908707A (en) 1975-09-30

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US426557A Expired - Lifetime US3908707A (en) 1972-12-22 1973-12-20 Device for the delivery of predetermined weft lengths in a shuttleless weaving machine

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US (1) US3908707A (enrdf_load_stackoverflow)
JP (1) JPS5620374B2 (enrdf_load_stackoverflow)
CH (1) CH586300A5 (enrdf_load_stackoverflow)
GB (1) GB1456867A (enrdf_load_stackoverflow)
NL (1) NL7217617A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5982447A (ja) * 1982-09-30 1984-05-12 リユ−テイテ・シユトラ−ケ・ビ−・ブイ シヤトルなし織機において流動する流体により縦糸開口を通って横糸を運搬する方法
JPS61500925A (ja) * 1984-01-13 1986-05-08 ロ−ベルト・ボッシュ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング 内燃機関の回転数制御方法及びその装置
CN113957593A (zh) * 2021-09-27 2022-01-21 常州市新创智能科技有限公司 一种机织碳纤维布用储纬装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580444A (en) * 1967-09-04 1971-05-25 Strake Maschf Nv Device for localizing an excess in length in a thread
US3669328A (en) * 1969-06-21 1972-06-13 Luigi Castelli Yarn feeding and tensioning apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580444A (en) * 1967-09-04 1971-05-25 Strake Maschf Nv Device for localizing an excess in length in a thread
US3669328A (en) * 1969-06-21 1972-06-13 Luigi Castelli Yarn feeding and tensioning apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5982447A (ja) * 1982-09-30 1984-05-12 リユ−テイテ・シユトラ−ケ・ビ−・ブイ シヤトルなし織機において流動する流体により縦糸開口を通って横糸を運搬する方法
JPS61500925A (ja) * 1984-01-13 1986-05-08 ロ−ベルト・ボッシュ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング 内燃機関の回転数制御方法及びその装置
CN113957593A (zh) * 2021-09-27 2022-01-21 常州市新创智能科技有限公司 一种机织碳纤维布用储纬装置

Also Published As

Publication number Publication date
GB1456867A (en) 1976-12-01
JPS5620374B2 (enrdf_load_stackoverflow) 1981-05-13
JPS4987858A (enrdf_load_stackoverflow) 1974-08-22
CH586300A5 (enrdf_load_stackoverflow) 1977-03-31
NL7217617A (enrdf_load_stackoverflow) 1974-06-25

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