US3857419A - Weft gripper for shuttleless looms - Google Patents

Weft gripper for shuttleless looms Download PDF

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Publication number
US3857419A
US3857419A US00392906A US39290673A US3857419A US 3857419 A US3857419 A US 3857419A US 00392906 A US00392906 A US 00392906A US 39290673 A US39290673 A US 39290673A US 3857419 A US3857419 A US 3857419A
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US
United States
Prior art keywords
inserter
hook
lever
weft
yarn
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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
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US00392906A
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English (en)
Inventor
W Mackie
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James Mackie and Sons Ltd
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James Mackie and Sons Ltd
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Filing date
Publication date
Application filed by James Mackie and Sons Ltd filed Critical James Mackie and Sons Ltd
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Publication of US3857419A publication Critical patent/US3857419A/en
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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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • D03D47/23—Thread grippers

Definitions

  • ABSTRACT rea n am A weft inserter for a shuttleless loom of the transfer type having a pivoted lever carrying or formed with a C(i1 y hook at one end the hook being located adjacent [58] Fieid 122 R 123 the leading end of the inserter and the lever being piv- 139/127 otally mounted to the inserter adjacent the hook.
  • This invention relates to shuttleless looms of the transfer type, i.e., looms in which the weft thread is carried through the warp shed by means of two weft inserters, e.g., spears or rapiers each being reciprocated into and out from the shed from opposite sides of the loom respectively, one spear gripping the weft thread to carry the weft into the shed, the thread being then transferred at the centre of the shed to the other spear which is then driven outwardly to carry the thread through the remainder of' the shed.
  • weft inserters e.g., spears or rapiers each being reciprocated into and out from the shed from opposite sides of the loom respectively
  • An inserter for a shuttleless loom in accordance with the invention has a pivoted lever carrying or formed with a yarn hook at one end the hook being located adjacent the leading end of the inserter and the lever being pivotally mounted to the inserter adjacent the hook.
  • a yarn clamp surface is preferably provided adjacent the hook so that yarn can be trapped between the hook and the clamp surface and the position of the pivot of the lever enables the yarn to be clamped tightly and positively.
  • the inserter preferably has two levers one carrying the hook at its outer end and being pivotally mounted on the leading end of the inserter at a point closely adjacent the hook and the other being pivotally mounted between its ends and having its leading end movably connected to the trailing end of the first lever. Pivotal movement ofthe second lever, the pivot point of which is preferably nearer the trailing end than the leading end, caused, for example, by a small downward movement of the trailing end, then provides a positive and relatively large movement of the first lever to enable the hook to be moved to a position to release the yarn. It also enables the hook to be moved to an open position during yarn engagement and immediately thereafter closed, tightly to clamp the yarn. This has significant advantages with certain yarns but is need not be employed with all yarns.
  • Such a hooked inserter may be modified by the provision of a deflector located to one side of the hook and so designed and arranged as to cause weft yarn held by an inserter designed to lead the weft into the shed to be engaged by the deflector on the two inserters meeting, to be guided over and down behind the hook so that the yarn is caught properly by the hook when the inserters move apart.
  • a shuttleless loom of the transfer type in accordance with a further feature of this invention has an opener, for the yarn gripper of a weft inserter, which extends over a plurality of warp threads and which is arranged to act through the warp to operate the gripper of an inserter passing through the shed.
  • the opener may, for example, comprise a block or bridge member possibly attached to the reed and arranged to press on the inserter through the intermediary of the warp threads or preferably for weak yarns it may comprise a row of plates or rods each of which projects down through the warp threads between pairs thereof.
  • the wear and tear on the inserter is reduced as the gripper can be opened and closed at any desired speed and for any desired period merely by altering the length of the opener. It will be appreciated that a loom having such an opener for the yarn gripper of a weft inserter may be used either with the particular inserter defined above or with any other weft inserter.
  • a loom incorporating the inserter of this invention is conveniently provided with an opener as defined above to pivot the hooked lever to open the gripper of the inserter receiving the weft thread during weft release and/or weft transfer.
  • the opener is designed to engage a part of the inserter during the desired period to open the gripper just before weft transfer and to maintain it open long enough for the weft end to be correctly and fully inserted into the gripper.
  • the hooked lever is pivoted to clamp the weft yarn.
  • a similar opener may be provided beyond the shed to open the gripper to release the weft thread.
  • FIGS. 1 and 2 are diagrams illustrating the inserter which is shown as a right hand" inserter at two stages of operation;
  • FIG. 3 is a perspective view of the inserter
  • FIG. 4 is a diagram illustrating an alternative embodiment of inserter
  • FIG. 5 is a plan view of the inserter of FIG. 4;
  • FIGS. 6 and 7 are diagrams showing the right hand inserter of FIGS. 1-3 in use on a modified loom;
  • FIG. 8 is a perspective diagram of part of the modified loom showing the means to open the gripper of the right hand inserter.
  • FIG. 9 is a diagram corresponding to FIG. 8 showing an alternative opening means.
  • the shuttleless loom in which the inserter of this invention is to be used if of the transfer type in which weft yarn is carried into the shed by a conventional left hand inserter which reciprocates into and out from the left hand side of the shed and then transferred at the centre of the shed to a right hand inserter in accordance with the invention which reciprocates into and out from the right hand side of the shed and which acts to pull the weft through the right hand side.
  • the usual shed forming devices, reed etc., none of which are shown are, however, present.
  • Each spear has a gripper to grip a length of weft yarn and pull it through one half of the shed.
  • the right hand spear 2 shown in FIGS. 1-3 has a hooked arm 4 pivoted at 6 adjacent its leading end and adjacent, but forward of, the hook 8.
  • the rear end 10 of the arm 4 is engaged by the leading end 12 of a second arm 14 which is pivoted to the spear at 16 at a point between its ends.
  • the rear end of the second arm is bowed at 18 and is urged by a spring to a position in which the lower face of the hook 8 is held against a shoulder 22 of the spear to provide a clamp.
  • the hook 8 passes beneath a weft yarn length indicated at 24.
  • the hook 8 As the right inserter reverses the weft is caught by the hook 8 and is clamped between the hook and shoulder 22. The yarn is then pulled from the left hand inserter to be carried to the right hand side of the shed.
  • the hook 8 As the right inserter 2 collects the weft during transfer from the left the hook 8 remains urged towards the shoulder 22 by the spring 20 so that the weft is simply pulled forcibly between the two as the spears reverse their directions.
  • the hook is curved upwardly so as to provide a substantial lead-in for the weft end.
  • the right spear 2 continues to lay the weft into the remaining half of the shed until the bowed portion 18 of arm 14 engages a bridge member 26 positioned outside the shed which causes the arm 14 to pivot in a clockwise direction about its pivot 16 and the end engaging the recess of lever 4 rises to lift the lever 4 and consequently the hook 8 is disengaged from the shoulder 22 to release the weft end.
  • the inserter continues to move to the right for a small distance to leave the trailing end outside the shed.
  • the spring 20 may have to be changed. This operation is simply accomplished by taking out the pivot pin 16, lifting off the lever 14 and removing and replacing the spring.
  • FIGS. 4 and 5 show a right hand" inserter similar to that described with reference to FIGS. 1-3 but modified by the provision of a deflecting member 27 runningparallel with the straight portion of arm 4 and connected thereto at its rear end.
  • This deflector has its free end pointing towards the front of the inserter and extends beyond the free end of the hook 8 which points towards the back of the inserter.
  • the underside of the member 27 is curved downwardly so as to deflect the weft and maintain it under tension as it travels over the upper surface of the hook during transfer from the left to right hand inserter.
  • the weft reaches the end of the hook it immediately springs down into the slot 28 and on reversal of the inserters is gripped in the hook as previously described.
  • As the bottom of the slot 28 is at least level or slightly lower than the shoulder 22 and the end of the hook 8 curves upwardly to prevent the weft from escaping, there is virtually no possibility of losing a weft end during transfer.
  • the modified inserter may be used with a conventional left hand" inserter which holds the weft in such a way as to present it between the deflector and the hook of the modified right hand inserter.
  • FIGS. 6-9 the modified loom therein illustrated is adapted to open thegripping device of the right hand inserter during transfer of weft from the left hand inserter. Whilst the right hand inserter shown is that hitherto described with reference to FIGS. 1-3 it will be appreciated that the inserter of FIGS. 4 and 5 could be used.
  • the means to open the gripper i.e., the hook 8
  • the means to open the gripper comprises a plate 30 angled upwardly at each end and fixed to the reed 32 of the loom. During operation this plate actually presses on the warp threads in order to reach the bowed portion 18 of the lever 14 and because the threads will be sandwiched between the plate and the moving lever a resilient pad, e.g., of felt 34 is provided under the plate.
  • the plate is connected to the reed by bars 36 which are bolted to a block 38 positioned on top of the reed the bolts passing through slots 40 in the bars to permit vertical adjustment, determined by the amount of opening required and slots may also be required in the block 38 to allow horizontal adjustment.
  • the gripper opener may comprise a block of the material known as Tufnol at least the ends of which are curved to give gentle opening and closing of the gripper.
  • the opener of whatever type extends over a plurality of warp threads e.g., 18 to give effective and reasonably gentle opening and closing of the gripper in the centre of the shed.
  • a weft inserter for a shuttleless loom of the transfer type having a pivoted lever, a yarn hook formed integrally with one end of said lever, said hook being located adjacent the leading end of the inserter and the lever being pivotally mounted to the inserter adjacent the hook.
  • a weft yarn inserter as claimed in claim 1 including a second lever pivotally mounted between its ends and having its leading end pivotally connected to the trailing end of said first lever.
  • An inserter as claimed in claim 1 including a deflector located to one side of said hook and arranged to guide weft thread being received by the inserter over and down behind said hook.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US00392906A 1972-08-31 1973-08-30 Weft gripper for shuttleless looms Expired - Lifetime US3857419A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4049872A GB1447861A (en) 1972-08-31 1972-08-31 Looms and weft inserters therefor

Publications (1)

Publication Number Publication Date
US3857419A true US3857419A (en) 1974-12-31

Family

ID=10415210

Family Applications (1)

Application Number Title Priority Date Filing Date
US00392906A Expired - Lifetime US3857419A (en) 1972-08-31 1973-08-30 Weft gripper for shuttleless looms

Country Status (12)

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US (1) US3857419A (xx)
JP (2) JPS4992365A (xx)
BE (1) BE804327A (xx)
BR (1) BR7306768D0 (xx)
CH (2) CH579163A5 (xx)
DD (1) DD110313A5 (xx)
DE (1) DE2344123A1 (xx)
ES (2) ES418352A1 (xx)
FR (1) FR2334774A1 (xx)
GB (1) GB1447861A (xx)
IT (1) IT993819B (xx)
NL (1) NL7312008A (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4949762A (en) * 1987-10-02 1990-08-21 Textilma Ag Weft gripper for shuttleless loom
US5083585A (en) * 1990-05-16 1992-01-28 Sulzer Brothers Limited Clamp element for a weft picking element
US20050257849A1 (en) * 2004-05-19 2005-11-24 Dominique Maes Pneumatically controllable weft thread clamp for a weaving machine
US20070157989A1 (en) * 2006-01-06 2007-07-12 Sultex Ag Inserting rapier for a rapier weaving machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978897A (en) * 1975-06-06 1976-09-07 Rockwell International Corporation Weft extending carrier
GB1582326A (en) * 1976-04-09 1981-01-07 Mackie & Sons Ltd J Looms
US4664774A (en) * 1984-07-06 1987-05-12 Allied Corporation Low solids content, coal tar based impregnating pitch

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960118A (en) * 1955-08-29 1960-11-15 Ancet Victor Marie Joseph Shuttleless weaving looms
US3390707A (en) * 1965-05-20 1968-07-02 Nuovo Pignone Spa Weft-carrying mechanism for weaving looms having a continuous weftsupply mechanism
US3532136A (en) * 1967-07-13 1970-10-06 Ramon Balaguer Golobart Organs for grasping woof threads in inserting elements of stationary woof frames
US3578031A (en) * 1968-09-27 1971-05-11 Firm Of Jean Gusken The Hook-shaped gripper point
US3613741A (en) * 1969-01-21 1971-10-19 Boris Kroll Jacquard Looms Inc Shuttleless loom

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL167739C (nl) * 1969-04-30 1982-01-18 Somet Soc Mec Tessile Overneemgrijper voor een weefgetouw.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960118A (en) * 1955-08-29 1960-11-15 Ancet Victor Marie Joseph Shuttleless weaving looms
US3390707A (en) * 1965-05-20 1968-07-02 Nuovo Pignone Spa Weft-carrying mechanism for weaving looms having a continuous weftsupply mechanism
US3532136A (en) * 1967-07-13 1970-10-06 Ramon Balaguer Golobart Organs for grasping woof threads in inserting elements of stationary woof frames
US3578031A (en) * 1968-09-27 1971-05-11 Firm Of Jean Gusken The Hook-shaped gripper point
US3613741A (en) * 1969-01-21 1971-10-19 Boris Kroll Jacquard Looms Inc Shuttleless loom

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4949762A (en) * 1987-10-02 1990-08-21 Textilma Ag Weft gripper for shuttleless loom
US5083585A (en) * 1990-05-16 1992-01-28 Sulzer Brothers Limited Clamp element for a weft picking element
US20050257849A1 (en) * 2004-05-19 2005-11-24 Dominique Maes Pneumatically controllable weft thread clamp for a weaving machine
US7219702B2 (en) * 2004-05-19 2007-05-22 N.V. Michel Van De Wiele Pneumatically controllable weft thread clamp for a weaving machine
US20070157989A1 (en) * 2006-01-06 2007-07-12 Sultex Ag Inserting rapier for a rapier weaving machine

Also Published As

Publication number Publication date
GB1447861A (en) 1976-09-02
FR2334774B1 (xx) 1978-05-12
BE804327A (fr) 1973-12-17
IT993819B (it) 1975-09-30
DE2344123A1 (de) 1974-03-14
FR2334774A1 (fr) 1977-07-08
CH582261A5 (xx) 1976-11-30
JPS4992365A (xx) 1974-09-03
ES437055A1 (es) 1977-01-16
NL7312008A (xx) 1974-03-04
ES418352A1 (es) 1976-03-16
JPS5285563A (en) 1977-07-15
BR7306768D0 (pt) 1974-07-25
DD110313A5 (xx) 1974-12-12
CH579163A5 (xx) 1976-08-31

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