US3430664A - Looms - Google Patents

Looms Download PDF

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Publication number
US3430664A
US3430664A US625480A US3430664DA US3430664A US 3430664 A US3430664 A US 3430664A US 625480 A US625480 A US 625480A US 3430664D A US3430664D A US 3430664DA US 3430664 A US3430664 A US 3430664A
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US
United States
Prior art keywords
reservoir
yarn
weft
loom
spear
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.)
Expired - Lifetime
Application number
US625480A
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English (en)
Inventor
Derrick Walter Shimwell
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.)
Weaving Research & Textile Com
Weaving Research & Textile Commission Agents Ltd
Original Assignee
Weaving Research & Textile Com
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 Weaving Research & Textile Com filed Critical Weaving Research & Textile Com
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Publication of US3430664A publication Critical patent/US3430664A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J3/00—Weavers' tools, e.g. knot-tying tools
    • D03J3/04—Shuttle-threading tools
    • 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

  • This invention relates to looms in which the weft is not carried in the form of pirns or cops by shuttle but is supplied from stationary packages and is inserted through the warp shed by means of, for example, spears or rapiers.
  • a loom of this type can insert weft yarn at a higher speed than the conventional fiat shuttle loom but the weft yarn is only in intermittent demand.
  • the intermittent demand causes plucking of yarn from the supply packages and the yarn is only drawn intermittently from the supply packages or cones.
  • the point at which laying of yarn begins is remote from the supply package and the yarn is laid at a point where the spear is travelling fast causing high yarn tension which acts to augment the effect of plucking of the yarn from the supply package.
  • a combination of these two factors has been found to be a cause of weft breakage.
  • a loom of the spear type in accordance with this invention has a weft reservoir for one, or normally each, spear into which weft yarn is blown from a supply package by a jet of, for example, air and from which the yarn may be drawn by the spears as and when needed.
  • the pressure of the air issuing from the jet may be adjusted so that the yarn is drawn from the supply package into the reservoir at a substantially constant rate without plucking so that the tension in the weft yarn will thus be substantially reduced, allowing weaving at higher speeds and with less yarn breaks than has been the case hitherto.
  • the yarn is then drawn from the reservoir intermittently by the spears and for each laying cycle the feed of weft yarn to the reservoir from the supply packages will approximately equal the length of yarn drawn from the reservoir intermittently by the spears.
  • the rate of supply of weft to the reservoir which occurs during both movements has to approximate to half that at which the spears take-up yarn from the reservoir during their laying movement.
  • the loom can also weave double pick cloth when the demand for weft will be doubled and an increase in air pressure required.
  • the reservoir is conveniently in the form of a tube, the diameter of which may depend on the range of yarns being woven, and the pressure of air blown into it is also ice variable to suit the weight of yarn.
  • the reservoir is 10 to 12 inches long, diameter, and the air pressure is approximately 7 to 8 lbs. per square inch.
  • the air blowing into the reservoir is conveniently released from a hole or holes through the wall of the reservoir or at the outlet end thereof so that the yarn is not blown out from the reservoir to the spears when this is not required.
  • a single outlet hole is preferred and a cover may be provided to allow air only to pass outwardly from the tube, the cover which is akin to a flap valve closing to prevent air entering when a threading-up operation is taking place.
  • An air jet nozzle may also be present at the outlet end of the reservoir or between the reservoir and the spear to blow the weft yarn to the spear head.
  • This jet is preferably only operative as and when the spear is laying yarn and will not operate for the remaining portion of the spear cycle. It will normally only be used with heavy yarns such as jute, sacking weft and hard fibre yarns.
  • An additional nozzle may be positioned at the outlet of the reservoir to facilitate threading-up of the spear.
  • the reservoir is employed with a loom in which the spears are reciprocated in a straight line, means such as the linkage described in the specification of our U.S. Patent No. 2,860,667 may be provided to take-up the slackness of the weft yarn which occurs during part of each cycle of spear movement.
  • the reservoir may either be located between the supply package and the first pivotal link or it may be carried by, or from, one of the links.
  • FIGURE 1 is a sketch illustrating the use of an air fed weft reservoir with a spear loom of the type forming the subject;
  • FIGURE 2 is a detail of the air escape hole at the reservoir outlet
  • FIGURES 3-6 are diagrams illustrating the use of a weft reservoir with oth r typ s of spear looms;
  • FIGURE 7 is a sketch of an alternative form of weft reservoir.
  • FIGURE 8 is a section outline VIIIVHI of FIG- URE 7.
  • the loom comprises two curved weft inserting needles, hereinafter called spears, 2, 4 each carried at the end of an arm 6 or 8 respectively.
  • the arms are joined and are mounted for arcuate movement about a common shaft 10.
  • the spears are caused to move in an arc in the same path and to lay weft in separate sheds (for further details of the operation of the loom reference should be made to the specification of our co-pending U.S. application Ser. No. 625,479).
  • FIGURE 1 omits all details of the loom with the exception of those necessary to the proper understanding of this invention. Also for convenience a reservoir is only shown for the left hand spear 2, a similar reservoir is present in practice for the weft fed to the right hand spear 4.
  • the weft supply for the left hand spear 2 comprises two tag-ended cones 12, mounted within a shield 14.
  • the tube 18 is pivotally mounted at its inlet end by means not shown in the sketch and is pivotally connected at its outlet end by an outlet elbow 22 to a pipe 24 which extends along the length of the arm 6 and connects with a further pipe or passage 26 extending along the spear and terminating at the spear head 28.
  • a source of compressed air is connected through an adjustable reducing valve 30 through a pipe 32 to a nozzle 34 which is positioned to be open through the wall of the inlet tube 20 to blow a jet of air through the inlet 20 into the reservoir.
  • the jet is continuous and acts to draw the weft yarn into the reservoir where it accumulates in a number of coils indicated at 36 (FIG. 7).
  • the weft is laid by the spears intermittently and so the demand for weft yarn to be drawn from the reservoir is intermittent. However due to the accumulation of yarn in the reservoir the intermittent demand is not transmitted to the cones and yarn is drawn therefrom without significant or abrupt changes in tension.
  • the pressure of the air jet through the nozzle 34 is adjusted so that the consumption of yarn is approximately equal the supply of yarn to the reservoir.
  • the hole 38 is provided with a hinged cover 40 (FIG. 2) which allows air to escape from the outlet 22 but which prevents air from being sucked into the outlet.
  • the jet is only operated at those intervals so as to prevent excess yarn billowing from the spear heads.
  • This is achieved by the choice of a suitable shape for the earns 48 which are driven from a shaft 52 rotating in time with the operation of the other parts of the loom.
  • the pressure of the air at the nozzle 50 may be 20-30 lbs. per square inch the exact figure will in each case be determined by experiment.
  • a valve (not shown) is opened to allow a strong blast of air to blow through a nozzle 54 at the end of an air pipe 55, the nozzle connecting with the outlet elbow 22 after the escape hole 38 causing yarn to be fed from the reservoir and passages 24 and 26 to the spear head, the grippers (not shown) at the spear heads being opened to allow the yarn to emerge.
  • a good suction for the reservoir is achieved as the cover 40 for the escape hole closes to prevent air being drawn into the outlet by the jet.
  • a reservoir tube 60 is located at each side of a spear loom (only one side being shown) and yarn is fed into the reservoir from a supply cone 62 by an air jet 64.
  • the yarn then passes along pipes connected as pivotal links 66, 68 for the purpose of the taking up surplus of yarn as described in the specification of our U.S. Patent No. 2,860,667.
  • the yarn is then fed to the inner end of a spear 70 reciprocating in a straight line path.
  • the yarn may be assisted in its passage through the links by a second air jet 72.
  • FIGURE 4 differs from that of FIGURE 3 only in that the reservoir tube is bent through 180 allowing for a more compact arrangement.
  • reservoir tube 60 can be carried by or can replace the link 66 and such an arrangement is shown in FIGURE 5.
  • the arms 66, 68 are replaced by a single arm 75 to control the weft and remove the yarn from the reservoir in a more uniform manner.
  • the reservoir 60 is located between the eye 76 Where the weft yarn engages the spear 70, and the cone 62.
  • the weft yarn reservoir shown in any one of FIGURES 1-6 could be of the form shown in FIGURES 7 and 8.
  • This with reservoir 80 is rectangular in section as can be seen in FIGURE 8 and has a dimension at the inlet 20 not significantly greater than that of the tube 20 so as to limit the turbulence where the air jet enters the reservoir.
  • the reservoir then increases in one dimension as seen in the drawing so as to allow the yarn coils to move down the reservoir without undue friction.
  • the reservoir terminates at a tapering section connected to the outlet elbow 22.
  • An air escape hole 82 is formed adjacent the outlet for the reservoir and again a flap valve 84 is provided to prevent air being sucked into the air lines.
  • the reservoir would normally be of rigid material with at least one wall 86 transparent.
  • a needle loom in which weft yarn is supplied from stationary packages to oscillating weft inserting means to be inserted into warp sheds, storage means in which the weft can be temporarily stored during its passage from said supply to said inserting means, wherein said storage means for weft yarn is in communication with said weft inserting means, a gas jet positioned to blow weft yarn into the storage means from said supply package, the arrangement being such that weft yarn can be drawn from the storage means by the weft inserting means as needed during weaving.
  • a loom as claimed in claim 1 in which said weft inserting means comprises a spear provided at each side of the loom and said storage means comprises a plurality of reservoirs whereby a reservoir is provided for each spear.
  • a loom as claimed in claim 1 in which each jet is connected to a source of compressed air.
  • each reservoir is in the form of a tube.
  • each reservoir is rectangular in section and has an air inlet pipe.
  • each reservoir has a section which tapers outwardly in one direction from a dimension at the inlet which is substantially equal to the dimension of the air inlet pipe.
  • a loom as claimed in claim 2 in which a yarn passage is provided between each reservoir and the head of its respective spear.
  • each reservoir has only a single escape valve which is normally closed by a cover arranged to allow air only to pass outwardly from the reservoir and to prevent air from being sucked into the reservoir.
  • a loom as claimed in claim 8 in which a passage is provided at the inlet end of each reservoir to allow the incoming gas jet to escape when the reservoir is sufiiciently supplied with yarn to create a back pressure.
  • a loom as claimed in claim 11 in which a second jet nozzle is present between the outlet end of each reservoir and the spear head to assist in blowing yarn to the spear head.
  • a loom as claimed in claim 2 in which a further nozzle is positioned adjacent the outlet of each reservoir to provide a jet which in use helps to suck yarn from the reservoir and to blow it to the spear head to facilitate threading-up of the respective spear.
  • a loom as claimed in claim 2 in which the spears are reciprocated in an arc with the reservoir extending radially from the center of the are so that the weft yarn path length remains substantially constant throughout weaving.
  • a loom as claimed in claim 15 wherein said reservoirs are mounted to a common pillar which is located at the center of the arc and on which two arms, each of which carries one of the spears, are pivotally mounted.
  • a loom as claimed in claim 17 in which the said means comprises for each spear two pivotal links, the reservoir being located between the supply package and the first pivotal link.
  • a loom as claimed in claim 18 wherein at least part of the reservoir is flexible and is mounted in a curved position.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US625480A 1966-03-30 1967-03-23 Looms Expired - Lifetime US3430664A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB04100/66A GB1183934A (en) 1966-03-30 1966-03-30 Improvements in and relating to Looms

Publications (1)

Publication Number Publication Date
US3430664A true US3430664A (en) 1969-03-04

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ID=10034978

Family Applications (1)

Application Number Title Priority Date Filing Date
US625480A Expired - Lifetime US3430664A (en) 1966-03-30 1967-03-23 Looms

Country Status (6)

Country Link
US (1) US3430664A (es)
BE (1) BE696348A (es)
CH (1) CH457313A (es)
DE (1) DE1710380A1 (es)
ES (1) ES338630A1 (es)
GB (1) GB1183934A (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173990A (en) * 1978-03-13 1979-11-13 Hitco Temporary fabric and method and apparatus for weaving same
US4787424A (en) * 1986-10-15 1988-11-29 Klimovskoje Spetsialnoje Knostruktorskoje Bjuro Po Projektirovaniju Tkatskogo Oborudovanija Method of inserting loops of continuous weft thread in a needle loom
WO2010006774A2 (en) * 2008-07-15 2010-01-21 Picanol N.V. Storage element for weft thread
BE1018606A3 (nl) * 2008-07-15 2011-05-03 Picanol Nv Inrichting voor het voeden van inslagdraad.

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS153859B1 (es) * 1971-08-05 1974-03-29
DE2365037C2 (de) * 1973-12-28 1984-08-02 Rüti-te Strake B.V., Deurne Vorrichtung zur Vorbereitung vorherbestimmter Schußfadenlängen in einer schützenlosen Webmaschine
FR2495196A1 (fr) * 1980-11-28 1982-06-04 Alsacienne Constr Meca Procede et dispositif de formation d'une reserve de fil de trame pour metiers a tisser

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1361530A (en) * 1916-09-09 1920-12-07 Savage Tire Company Loom element
US2860667A (en) * 1955-08-03 1958-11-18 Weaving Res & Textile Commissi Looms for weaving
SE174387C1 (es) * 1958-01-21 1961-02-21
US3137322A (en) * 1960-02-24 1964-06-16 Strake Lambertus Te Pneumatic loom
US3194276A (en) * 1963-09-20 1965-07-13 Crompton & Knowles Corp Metering device for weft in looms

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1361530A (en) * 1916-09-09 1920-12-07 Savage Tire Company Loom element
US2860667A (en) * 1955-08-03 1958-11-18 Weaving Res & Textile Commissi Looms for weaving
SE174387C1 (es) * 1958-01-21 1961-02-21
US3137322A (en) * 1960-02-24 1964-06-16 Strake Lambertus Te Pneumatic loom
US3194276A (en) * 1963-09-20 1965-07-13 Crompton & Knowles Corp Metering device for weft in looms

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173990A (en) * 1978-03-13 1979-11-13 Hitco Temporary fabric and method and apparatus for weaving same
US4787424A (en) * 1986-10-15 1988-11-29 Klimovskoje Spetsialnoje Knostruktorskoje Bjuro Po Projektirovaniju Tkatskogo Oborudovanija Method of inserting loops of continuous weft thread in a needle loom
WO2010006774A2 (en) * 2008-07-15 2010-01-21 Picanol N.V. Storage element for weft thread
WO2010006774A3 (en) * 2008-07-15 2010-04-29 Picanol N.V. Storage element for weft thread
BE1018606A3 (nl) * 2008-07-15 2011-05-03 Picanol Nv Inrichting voor het voeden van inslagdraad.

Also Published As

Publication number Publication date
BE696348A (es) 1967-09-01
CH457313A (de) 1968-05-31
ES338630A1 (es) 1968-04-01
GB1183934A (en) 1970-03-11
DE1710380A1 (de) 1972-01-05

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