US3447574A - Weft-gripper for shuttleless loom - Google Patents

Weft-gripper for shuttleless loom Download PDF

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Publication number
US3447574A
US3447574A US559594A US3447574DA US3447574A US 3447574 A US3447574 A US 3447574A US 559594 A US559594 A US 559594A US 3447574D A US3447574D A US 3447574DA US 3447574 A US3447574 A US 3447574A
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United States
Prior art keywords
weft
gripper
shed
reed
loom
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Expired - Lifetime
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US559594A
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English (en)
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Marcel Claeys
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Individual
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Individual
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/60—Construction or operation of slay
    • 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
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/60—Construction or operation of slay
    • D03D49/62—Reeds mounted on slay
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J5/00—Shuttles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J5/00—Shuttles
    • D03J5/06—Dummy shuttles; Gripper shuttles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J2700/00—Auxiliary apparatus associated with looms; Weavening combined with other operations; Shuttles
    • D03J2700/10—Shuttles
    • D03J2700/14—Gripper shuttles

Definitions

  • the weft or filling yarn is supplied by a movable containing a relatively large supply of yarn.
  • This member has been named a shuttle due to its back-and-forth motion from one side to the other side of the loom.
  • the shuttle passes through the shed of the loom which is composed of warp threads, some of which are upwardly placed to form the top of the shed and some of which are downwardly placed to form the bottom of the shed.
  • the shuttle In its passage through the shed, the shuttle unwinds a fill of yarn or thread and is caught at the other side of the loom.
  • the reed is used to beat the fill of thread, deposited in the shed, against previous fills which by this time comprise the manufactured cloth.
  • the shed usually is collapsed and remade, some or all of the warp threads previously forming the top of the shed, now forming the bottom of the new shed, while some or all previously bottom threads are in the top of the new shed.
  • the shuttle is then propelled through the new shed, depositing another fill of yarn in this new shed and being caught at the other side of the loom.
  • the shuttleless or false shuttle loom is a relatively recent improvement in weaving machines.
  • the supply of weft yarn is mounted as a stationary supply at one or both sides of the loom.
  • a movable member grasps an end of thread from such supply and is propelled partially or fully through the shed.
  • This movable member or weft-gripper is designed to grasp an end of the stationarily mounted yarn, the rest of the length of yarn, comprising a fill and perhaps a little more yarn, trailing behind the weftgripper.
  • a plurality of grippers is employed to carry a length of filling yarn through the shed.
  • Each of the plurality of grippers grasps an end of filling yarn from the stationary supply at one side of the loom, is propelled through the shed and releases the end at the other side, being caught by a brake box and returned to the loading position by a conveyor system.
  • a gripper mechanism reciprocates, shuttlewise, through the shed, grasping ends of filling yarn from a stationary supply at either side. of the loom, being propelled through the shed and releasing the end of filling yarn at the other side of the loom.
  • the trailing portion of the filling yarn of course, is left in the shed, where it is beaten, etc., as a fill in the traditional loom.
  • the shuttleless loom provides a number of advantages in weaving. It will be readily appreciated that a weftgripper need be only a small fraction of the weight of a traditional shuttle, which must contain a large supply of filling thread, thus passage of the weft-gripper through the shed is generally faster making for greater productivity of the cloth per loom. Also, the weight of the weft-gripper remains constant during its use, rather than declining in weight as a yarn supply nears exhaustion. Thus, the speed of passage through the shed can remain constant during fabrication of a length of cloth and the time allowed for beating, shed formation, etc., may be more accurately gauged without allowance for variation in the speed of fill deposition in the shed. It is apparent, also, that the use of a shuttless loom obviates the need for shuttle winding, the stationary weft holders being able to hold as much yarn as desirable, for example, being as large as warp-yarn holders.
  • Weft-grippers have been made with shears or a blade and one or two clamps which open when they pass over pre-set bosses along the raceway of the weft-gripper.
  • the customary weft-holders usually made entirely of metal, present the inconvenience of being difiicult to guide over the length of their tracks without suffering unusually heavy wear, and at the same time, the clamps and blades with which they are equipped preclude use at high speeds and with fine threads.
  • the weft-gripper of this invention provides a movable jaw for firmly gripping the weft-yarn end and for releasing it at the proper time in response to a fixed or movable actuating mechanism. It also provides means for cutting the thread. In addition, this invention supplies an improved guide means to define the weft-gripper raceway.
  • the weft-gripper has a flat bottom and provides a recess on its top surface to contain the movable jaw.
  • the motion of this jaw is advantageously a pivoting motion and the jaw may be spring-biased to a closed position against a fixed upper lip of the gripper.
  • the jaw pivots on an axis parallel to the line of travel of the weft-gripper.
  • the jaw is opened for release of the weft-yarn by a control mechanism which may impinge, at the proper moment of the flight of the gripper, after leaving the shed against a boss attached to the jaw.
  • the fixed portion of the Weft-gripper has a generally trapezoidal shape and its extreme angles are curved slightly upward in order to facilitate the introduction of the thread between the fixed portion and the movable jaw when the Weft-gripper has just been thrown.
  • the cutting mechanism is mounted on the front of the fixed portion of the weft-gripper vand advantageously is a double blade.
  • the weft-gripper provides a cutting member with a plurality of cutting surfaces.
  • a l0ngitudinal groove or depression is made in the upper surface of the movable jaw for insertion of a feeder of weft yarn.
  • the weft-gripper is essentially symmetrical, so that it may function in the same manner on either side of the loom.
  • the weftgripper is fashioned so as to provide a shoulder for reception of the false reed on its upper surface and advantageously the parts of the gripper which are subject to passage in contact with the extremely abrasive reed and false reed, are made of a self-lubricating fiber-reinforced synthetic resin.
  • the batten and movable jaw are preferably made of metal.
  • FIGURE 1 shows the novel weft-gripper of this invention in its passage through the shed of the loom
  • FIGURE 2 shows the batten with the weft gripper in the shed-passing position
  • FIGURE 3 shows the batten in the filling beating position after passage of the weft-gripper
  • FIGURE 4 is a cross-sectional view of the reed and the false reed, taken along the line 4-4 of FIGURE 1;
  • FIGURE 5 is a top view of the novel weft-gripper of this invention.
  • FIGURE 6 is a front view of the weft-gripper
  • FIGURE 7 is a side view of the gripper as in FIG- URE 1 with a thread feeder in position to feed thread;
  • FIGURE 8 is a cross-sectional view along the line 88 of FIGURE 5;
  • FIGURE 9 is a cross-sectional view along the line 99 of FIGURE 5.
  • FIGURE 10 is a partial cross-sectional view along the line 10-10 of FIGURE 5.
  • the loom indicated generally as 11 has a reed 13 placed between the transverse bar 15 and the batten 18. Supported by the transverse bar 15 is the false reed 20. As can be seen from FIGURES 1-3, the false reed is shorter than the reed itself. Also, FIGURE 4 makes it clear that the reed 13 comprises a plurality of tines 22 spaced relatively close together, as is conventional, while the false reed 20 comprises the tines 25 spaced wider apart, for example, about one tine 25 for each five tines 22. Each tine 25 is (however, aligned with a tine 22 to allow formation of the shed 28, comprising upper warp threads and lower warp threads 33. It will be noted that the tines 25 are held only at their upper end.
  • the weft-gripper passes through the shed 28 guided by the reed 13 and the upper surface of the batten 18 and also by the false reed 20 which advantageously fits into a shoulder 39 of the weft-gripper.
  • the batten oscillates to the position of FIGURE 3 in order for the reed 13 to beat the filling yarn deposited in the shed by passage of the weft-gripper 36.
  • Oscillation of the batten 18 may be brought about by any suitable means, for example, by the means described in my copending application Ser. No. 559,621, filed of even date herewith, and
  • the weft-gripper 36 comprises a body 44 to the under side of which the metal plate 48 is attached.
  • This metal plate 48 projects forwardly of the body 44 and advantageously is tapered and provided with the ears 50 to prevent the weft-gripper from becoming entangled in the warp threads 30 during passage through the shed 28.
  • the metal plate 48 is also provided at its forward edge with the recess 53 into which a blade having cutting edges 55, 58 and 60 may be placed.
  • Metal plate 48 is curvedaround forwardly to present the lip 63, and has the central cut-out position 66 wherein the jaw 70, pivoted at 72 and 75, operates.
  • the inner edges 78 and 80 of the lip 63 at the recess 66 are curved upwardly to facilitate introduction of the filling thread 82 when the thread holder 84 puts its downturned portion 90, containing the eye 93 into the depression 96 of the movable jaw 70. It is clear that this eye 93 may have weft-yarn threaded through it. It will be noted from FIGURE 2. that the ears 50 are closer to the upper warp threads 30 then the upwardcurved edges 78 and 80 during passage of the weft-holder through the shed, thus keeping the warp-threads out of the way of edges 78 and 80.
  • the forward edge 99 (see FIGURE 8) of the movable jaw is biased upwardly around the pivots 72 and by any convenient means such as springs 101 and 103 and has on its upper surface a boss such as 105, which, as shown, may be longitudinally extending for depressing of the jaw 70 to release and/or grasp the thread 82 at the proper times in the flight of the weft-holder, the boss being adapted to contact control elements on the loom which may be fixed or movable, as explained, for example, in my copending application Ser. No. 559,595, filed of even date herewith.
  • the body 44 is preferably made of a very durable and smooth synthetic material which practically cuts out wear and, moreover, eliminates any risk of vibration of the teeth 25 of the false reed 20 during the passage of the weft-holder.
  • This synthetic material ideally is composed of textile fibers impregnated with a synthetic resin.
  • the resultant unit possesses self-lubricating qualities. This body 44 permits the weft-holder to run along its track easily and insures minimum wear to the control elements.
  • the weftholder of this invention by interaction between the eye 93, the jaw 70 the edges 78 and and the cars 50, allows the weft-gripper to seize the thread as it comes out of the stationary supply and cut it by means of one of the cutting edges 55, 58 or 60, soon after its entry into the shed in order to bury the loose end.
  • the remaining attached thread is drawn across the shed.
  • the movable jaw '70 operated through the boss 105, against the bias of the springs 101 and 103 releases the thread when it emerges from the shed before entering into the opposite brake box.
  • the invention is not affected by replacing the pivots 72 and 75 and/or their bearings 107 by another articulation system for the jaw 70 of the clamp.
  • a weft-gripper for false-shuttle looms comprising a body having a flat bottom, a depression along the length of its upper surface for reception of a supply of weft-yarn, a vertically movable jaw in a recess in said upper surface, a spring holding said jaw against a fixed upper lip situated to the side of and above the lowest plane of said depression, means for guiding said weft-yarn into said jaw and said depression and means for cutting a length of weft-yarn from said supply.
  • a weft-gripper according to claim 1 in which the weft-gripper is essentially symmetrical to provide for jaw and cutter operation at either end of the loom.
  • a false reed having fewer tines than said reed, the tines of said false 30 reed being aligned with tines of the reed, said false reed being suspended above the batten by a space suflicient to define a raceway, in combination with a weft-gripper, having a shoulder into which said false reed fits, to guide the weft-gripper in flight, both vertically and horizontally.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US559594A 1965-06-25 1966-06-22 Weft-gripper for shuttleless loom Expired - Lifetime US3447574A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR46159A FR1453911A (fr) 1965-06-25 1965-06-25 Perfectionnements aux tire-trames pour métiers à tisser à fausse navette

Publications (1)

Publication Number Publication Date
US3447574A true US3447574A (en) 1969-06-03

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ID=9694506

Family Applications (1)

Application Number Title Priority Date Filing Date
US559594A Expired - Lifetime US3447574A (en) 1965-06-25 1966-06-22 Weft-gripper for shuttleless loom

Country Status (7)

Country Link
US (1) US3447574A (enrdf_load_stackoverflow)
BE (1) BE682433A (enrdf_load_stackoverflow)
DE (1) DE1535832A1 (enrdf_load_stackoverflow)
ES (1) ES328093A1 (enrdf_load_stackoverflow)
FR (1) FR1453911A (enrdf_load_stackoverflow)
GB (1) GB1122336A (enrdf_load_stackoverflow)
SE (1) SE339446B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717181A (en) * 1971-05-28 1973-02-20 Manta Looms with a stationary weft supply and a weft carrier with gripper
US3717182A (en) * 1970-05-18 1973-02-20 R Sparling Rapier loom
JPS5143468A (enrdf_load_stackoverflow) * 1974-09-11 1976-04-14 Rieter Ag Maschf

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2644480B1 (fr) * 1989-03-17 1991-06-21 Fabre Aime Perfectionnements aux dispositifs pince-fil montes sur l'organe passe-trame des metiers a tisser a reserves de trame fixes

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1729413A (en) * 1928-12-05 1929-09-24 Aberfoyle Mfg Company Shuttle
GB398539A (en) * 1932-03-16 1933-09-18 Oliver Shimwell Improvements relating to weft inserting mechanism for looms for weaving
FR841222A (fr) * 1937-07-31 1939-05-15 Sulzer Ag Métier à tisser avec guidage disposé dans la foule pour l'introduction du fil de trame
US2603242A (en) * 1949-12-14 1952-07-15 Izquierdo Federico De L Santos Loom comb
GB783698A (en) * 1952-10-30 1957-09-25 Marcel Claeys Weft inserter for shuttleless looms
DE1023423B (de) * 1952-08-22 1958-01-23 Webstuhlbau Neugersdorf Veb Greiferschuetzenwebmaschine mit Zubringevorrichtungen fuer die einfach einzutragenden Schussfaeden und mit Greiferschuetzen mit Fangnasen, Klemm- und Abschneidevorrichtung
US2946353A (en) * 1958-09-25 1960-07-26 George W Dunham Pilots for filling threads
FR1249877A (fr) * 1959-11-18 1961-01-06 Perfectionnements aux métiers à tisser à réserve de trame fixe
GB971273A (en) * 1962-04-19 1964-09-30 Marcel Claeys Improvements in dummy shuttle weaving looms
FR1383420A (fr) * 1963-04-30 1964-12-24 Perfectionnements aux moyens de tissage par fausse-navette
CH400940A (de) * 1963-02-22 1965-10-15 Webstuhlbau Grossenhain Veb Greiferschützen-Webmaschine
FR1444145A (fr) * 1965-05-14 1966-07-01 Perfectionnements aux tire-trames pour métiers sans navette

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1729413A (en) * 1928-12-05 1929-09-24 Aberfoyle Mfg Company Shuttle
GB398539A (en) * 1932-03-16 1933-09-18 Oliver Shimwell Improvements relating to weft inserting mechanism for looms for weaving
FR841222A (fr) * 1937-07-31 1939-05-15 Sulzer Ag Métier à tisser avec guidage disposé dans la foule pour l'introduction du fil de trame
US2603242A (en) * 1949-12-14 1952-07-15 Izquierdo Federico De L Santos Loom comb
DE1023423B (de) * 1952-08-22 1958-01-23 Webstuhlbau Neugersdorf Veb Greiferschuetzenwebmaschine mit Zubringevorrichtungen fuer die einfach einzutragenden Schussfaeden und mit Greiferschuetzen mit Fangnasen, Klemm- und Abschneidevorrichtung
GB783698A (en) * 1952-10-30 1957-09-25 Marcel Claeys Weft inserter for shuttleless looms
US2946353A (en) * 1958-09-25 1960-07-26 George W Dunham Pilots for filling threads
FR1249877A (fr) * 1959-11-18 1961-01-06 Perfectionnements aux métiers à tisser à réserve de trame fixe
GB971273A (en) * 1962-04-19 1964-09-30 Marcel Claeys Improvements in dummy shuttle weaving looms
CH400940A (de) * 1963-02-22 1965-10-15 Webstuhlbau Grossenhain Veb Greiferschützen-Webmaschine
FR1383420A (fr) * 1963-04-30 1964-12-24 Perfectionnements aux moyens de tissage par fausse-navette
FR1444145A (fr) * 1965-05-14 1966-07-01 Perfectionnements aux tire-trames pour métiers sans navette

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717182A (en) * 1970-05-18 1973-02-20 R Sparling Rapier loom
US3717181A (en) * 1971-05-28 1973-02-20 Manta Looms with a stationary weft supply and a weft carrier with gripper
JPS5143468A (enrdf_load_stackoverflow) * 1974-09-11 1976-04-14 Rieter Ag Maschf
US4031926A (en) * 1974-09-11 1977-06-28 Ruti Machinery Works Ltd. Loom with means for introducing the filling threads by means of a fluid

Also Published As

Publication number Publication date
BE682433A (enrdf_load_stackoverflow) 1966-11-14
DE1535832A1 (de) 1972-03-16
GB1122336A (en) 1968-08-07
ES328093A1 (es) 1967-08-16
FR1453911A (fr) 1966-09-30
SE339446B (enrdf_load_stackoverflow) 1971-10-04

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