US3880200A - Weft thread holding device in a loom with fixed weft feeding - Google Patents

Weft thread holding device in a loom with fixed weft feeding Download PDF

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Publication number
US3880200A
US3880200A US405981A US40598173A US3880200A US 3880200 A US3880200 A US 3880200A US 405981 A US405981 A US 405981A US 40598173 A US40598173 A US 40598173A US 3880200 A US3880200 A US 3880200A
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US
United States
Prior art keywords
detent
clamp
gripper
weft thread
jaws
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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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US405981A
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English (en)
Inventor
Aime Fabre
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MANTA FR1972101272 36808
'manta'fr197210127236808
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MANTA FR1972101272 36808
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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
    • D03D47/24—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 by gripper or dummy shuttle
    • 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

Definitions

  • each holding clamp comprises two clamp halves having each a part receiving the clamp resilient closing reaction, a clamping jaw with an oblong shape in parallel relationship with the movement of the gripper shuttle and a connecting arm joining said part to the one jaw end in such a way that the jaw mutual application area is displaced in parallel relationship with the gripper shuttle movement relative to the connecting arm.
  • This invention pertains to a weft thread holding device in a loom with a stationary supply of weft thread comprising a. a moving gripper shuttle which comprises a gripper (with two gripping jaws) for clamping the weft thread;
  • each holding clamp comprising two clamp halves between which an end of the weft thread introduced by the detent is clamped after this detent has passed (at the same time that the means for opening the gripper release the weft thread from this gripper).
  • the stationary holding clamps on either side of the loom comprise two resilient clamping arms which are arranged in the path of the detent which is integral with the gripper shuttle, around which detent the weft thread is returned be tween the portion thereof pulled from the stationary supply and the end thereof clamped in the weft-thread gripper of the gripper shuttle;
  • said gripper is comprised in said known construction, of a clamp with movable jaws operated by cam members located on either side of the loom.
  • the known holding device has proved very efficient and has given very good results with heavy and medium threads.
  • the clamping surfaces of the clamp jaws will be damaged by the use, notably under the action of the continuous friction of the detent in such a way that said surfaces no more fit accurately one against the other after some operating time and do not retain well a very small diameter thread.
  • the invention has for object to provide a holding clamp as defined above which operates perfectly even with very fine threads, without any danger of damaging same and which on the other hand cannot cause the formation of any burs on the useful surface of said jaws.
  • the invention has moreover for object to provide such a clamp which may comprise simultaneously a device for monitoring weft breakage, that is a weftprotector device, as due to the permanence of the surface condition of said jaws, such jaws remain electrically insulated from one another by the weft thread after the passage of the detent in such a way that the accidental absence of said thread is detected by the direct engagement of said jaws with one another without any danger of false alarm.
  • a device for monitoring weft breakage that is a weftprotector device
  • each holding clamp comprises two clamp halves having each:
  • the device comprises a moving gripper shuttle with a gripper and an upwardfacing detent, and a pair of stationary holding clamps, each holding clamp comprising two clamp halves, each clamp half comprising an arm for retracting the clamp from the path of the detent of the gripper shuttle, a supporting leafjoined to the arm and a single body in the shape of a shoe, which is attached to the lower end of the supporting leaf and which comprises the main part of the clamp half, the clamping jaw and the connecting arm.
  • each clamp half has some resiliency about an axis at right angle to the gripper shuttle path and lying in the middle plane of the half concerned, in such a way that when the clamp closes beyond the gripper shuttle detent, the energy that might cause a hammer-blow action results directly but from a fraction of the mass of both clamp halves, the remainder being absorbed through a momentary resilient distortion of the arms and of the jaws themselves about a vertical axis at right angle to the weft path and lying in a plane passing through the connecting arm center.
  • the jaws of each holding clamp and the gripper shuttle detent are so arranged that the jaw area in which the weft thread is clamped after the detent passage is displaced relative to that jaw area in opening engagement with the gripper shuttle detent when this detent opens the jaws. Consequently, the jaw area in which the thread is clamped after the detent passage is not that area against which said detent rubs for the clamp opening and there results an increased stability of the pinching area for the weft thread.
  • both halves of the holding clamp include means for insulating electrically one half from the other to the exception of the jaw engagement area, electric connecting means for connecting to a circuit sending electric pulses for monitoring weft loss being provided on the uninsulated portion of each clamp half.
  • FIG. 1 is a diagrammatic view in perspective, with parts broken away, of the essential portions of a loom provided with the weft thread holding device according to the invention.
  • FIG. 2 is a diagrammatic view in perspective of a weft thread holding clamp which is part of the device according to the invention.
  • FIG. 3 is an elevation view in section of the device according to the invention by that time where the holding clamp is opened by the gripper shuttle detent along line III-III in FIG. 5.
  • FIG. 4 is a section view along the line IVIV in FIG. 3.
  • FIG. 5 is a part front elevation view of the device as shown in FIG. 3.
  • FIG. 6 shows on a larger scale a portion of FIG. 3.
  • FIG. 1 has been shown a loom with a stationary weft feeding on either side of the loom, in 2 and 3;
  • the gripper shuttle 4 is of the type described in U.S. Pat. No. 3,7 l 7,l8l (British Pat. application No. l8,l66/7l) as mentioned above;
  • said gripper shuttle comprises a main body 5 of elongated shape to be guided and forced over the loom guideway; said body 5 is integral with a laterally projecting base plate 6 which has a front rim 7 which slants upwards towards the body 5 so as to form the fixed jaw of the weft thread gripper of the gripper shuttle.
  • the movable jaw 9 has a nose 10 facing upwards and which can undergo the action of cam members such as 11, provided on either side of the loom to insure the opening of the gripper at the required times.
  • the base plate 6 bears a vertical detent 12 which rises through an opening 13 in the movable jaw 9.
  • the gripper shuttle is further provided with two upstanding cutting edges 19 mounted on each end of the movable jaw 9 with the cutting side thereof at the top. On the shed side after the clamping of the weft thread in the gripper shuttle one of these edges cuts off the weft thread which passes over the edge by the movement of the gripper shuttle.
  • a fixed holding clamp 20 for the weft thread which prevents the weft thread end from returning inside the shed when the gripper shuttle releases said thread.
  • the clamps 20 are opened by the passage of the gripper shuttle detent 12 between the arms thereof; the clamps close thereafter on the weft thread to retain same precisely by the time there occurs the opening of the movable jaw 9 of the gripper shuttle 4 under the action of cam member.
  • Each holding clamp 20 is supported by an arm 21 which is rotatably mounted at 22 on the loom batten 23; the motion of arm 21 is controlled by a crank-shaft device 24.
  • This crank-shaft device comprises a roller 25 rolling on a cam 26 mounted on a shaft 27 mounted in the batten, an upstanding rod having a forkshaped end in which the roller 25 is mounted.
  • a first crank pivotally connected to the other end of said rod and fastened to a shaft mounted in a hearing which is fastened to the batten 23, a second crank fastened to last mentioned shaft, the free end of which is pivotally connected to the upper end of an arm, the lower end of which is pivotally connected to the arm 21.
  • each clamp 20 On the drive shaft 27 is mounted a chain wheel over which runs a chain driven by the driving shaft of the battenv To the holding clamps 20 is thus imparted a swinging movement in a vertical plane so as to lie in or out of the path of the detent of the gripper shuttle 4.
  • the shaft 27 makes one-half revolution each picking so that, due to the position and form of the cams 26, alternately each clamp 20 is driven upwards after clamping the weft thread end as described above and after the pick having been beaten by the batten and the shed has closed at least partly. this being when the batten is between the forward position and the backward position.
  • the holding clamp 20 is positively opened and releases the weft thread end which can then be cut off by any suitable device.
  • the holding clamp 20 concerned remains in the up position at least until the gripper shuttle has left by the following stroke.
  • a supporting resilient leaf 28 and a clamping resilient leaf 29 are mounted on each surface of the free end of the arm 21 on each surface of the free end of the arm 21 on each surface of the free end of the arm 21.
  • the attachment of said leaves is insured by means of two anchor-plates 30 and 31 which are tightened against arm 21 by screws such as 32.
  • a layer 33 of insulating material between the supporting leaf 28 located on the side adjacent plate 31 and arm 21 is arranged a layer 33 of insulating material and that the screws 32 are in turn insulated from the anchor-plate 31 by an insulating layer 34 which is reinforced on the outside with a small metal plate 35, and by individual tubular grommets 36 that go through the anchor-plate 31, the corresponding leaves 28 and 29 and the arm 21.
  • an electric terminal 38 To the anchor'plate 31 provided therefor with an extension 37, is associated an electric terminal 38.
  • a second electric terminal 39 is provided on an upward extension 40 of arm 21.
  • a flat part 41 is attached with screws 42 to the lower end of each supporting leaf 28. Said part 41 in the shape of a shoe, receives the reaction of the adjacent resilient clamping leaf 29. On the one side, the part 41 is extended downwards with an arm 43 for connecting part 41 to a jaw 44, said jaw having a shape extending in parallel relationship with the movement direction of the gripper shuttle 4, as shown by arrow 45 in FIG. 5. It will be noted that to prevent any accidental electric contact between parts 4l of both clamp halves, one of said parts (the right-hand one in FIG. 3) is covered with an insulating layer 46 on the surface thereof facing the other part.
  • the two jaws 44 have each as considered sidewise, an oblong profile with a straight upper edge and a curved lower edge so as to slide over the weft thread located between the detent 12 and the gripper 9, 7, when the detent 12 enters the holding clamp 20.
  • the jaw 44 form with the arms 43 a kind of bracket each bracket being integral with a part 41. From another point of view, it might be considered that for forming each jaw there is first made a solid flat plate in one edge of which has been cut out an opening 47 shaped as a bracket which separates the jaw proper from the main part and which bounds the arm 43 at that side (to the right in FIG. 5) along which the detent 12 of the gripper shuttle moves. In horizontal section (FIG. 4), the jaws 44 have a curved diverging profile that forms a lead-in for detent 12.
  • the unit 41-43-44 is made from steel which is so treated as to have a very high surface hardness.
  • the arm 21 has an extension 48 directed downwards and the free end of which rotatingly bears a small horizontal shaft 49 of insulating material. Said shaft so extends as to pass between both arms 43 and the thin lower portion of both parts 41, but the corresponding portion of said shaft (between said arm and parts 41) has a flattened cross-section as shown in 50.
  • the detent 12 of the gripper shuttle has a particular profile, which is most clearly visible in the large scale cross-section shown in FIG. 6. As shown the detent top end has a projecting portion or head 57 which can engage the jaws 44 to spread same away from one another.
  • Underneath head 57 is provided with a recess 58 for locating the weft thread on that detent side along which the weft thread is pulled from the stationary supply and which lies opposite the gripper 9, 7.
  • This design of the top portion of detent 12 of the gripper shuttle has two results, namely on the one hand that by the opening of holding clamp 20 by detent 12, there is no danger of thread 14 rubbing against jaws 44, and on the other hand that the area of said jaws 44 which might be scored by the detent lies above the clamping area for said thread 14 which thus cannot be damaged by such scoring.
  • jaws 44 are made of treated steel with a very high surface hardness. there is substantially no danger of scoring said jaws. However even if there should be some local abrading this will have no action on thread 14 which as clearly shown in FIG. 8, is clamped below head portion 57 of the detent.
  • making the clamp jaws 44 of special treated steel requires having such jaws with a substantial thickness. much thicker than the one of the simple leaves used actually for making the previously-known clamp. Each clamp half thus has a relatively large mass which by the sudden closing ofjaws 44 behind detent 12, causes a substantial energy output.
  • each jaw half has a substantial resiliency about a clamp vertical axis.
  • a thread 14 even a very fine one, is able to insulate said jaws from one another when said thread is clamped therebetween, which would not be the case if said surfaces had burs. This insures that a voltage pulse applied to terminals 38, 39 as the clamp closes will allow to sense positively and without any danger of an error, the presence or the absence of the weft thread (which is considered as insulating).
  • the clamp thus acts as a perfectly efficient weft protector.
  • Weft thread holding device in a loom with stationary supply of weft thread comprising:
  • a gripper having two gripping jaws for clamping the weft thread
  • each holding clamp comprising two clamp halves between which an end of the weft thread introduced by the detent is clamped after the detent has passed, each clamp half comprising:
  • each holding clamp comprises an arm for retracting the clamp from the path of the detent of the gripper shuttle and a pair of supporting leaves joined to the arm, said two clamp halves each being secured to a respective leaf.
  • each holding clamp half further comprises a vertical supporting leaf, connected to said main part and a resilient clamping leaf secured to said supporting leaf which also extends vertically with the lower end bearing against said main part, the upper ends of the resilient supporting leaves and of the resilient clamping leaves of both clamp halves being attached to means for alternatively moving the clamp in and out of the gripper shuttle path.
  • a device as claimed in claim I in which the jaws of each holding clamp and the gripper shuttle detent are so arranged that the jaw area in which the weft thread is clamped after the detent passage is displaced relative to that area of said jaws in engagement with the gripper shuttle detent when this detent opens the jaws.
  • both halves of each holding clamp comprise means for insulating electrically one half from the other with the exception of the jaw engagement area, electric connecting means for connecting said halves to a circuit sending electric pulses for monitoring weft loss which would allow the jaws to engage each other and complete the circuit.
  • a gripper shuttle comprising a stationary weft thread supply, a gripper shuttle having a gripper for clamping the weft thread, detent means arranged on the gripper shuttle and extending upwards relatve to the gripper, means for feeding the weft thread from the stationary supply to the gripper crosswise to the detent means, means for releasing the weft thread from said gripper, said loom further comprising a pair of fixed clamps, one on either side of the loom between which an end of the weft thread introduced by the detent is clamped after this detent has passed at the same time that the means for opening the gripper release the weft thread from this gripper and means to bring each holding clamp in and out of the path of the gripper shuttle detent, the improvement comprising each holding clamp having two halves each comprising a shoe-like main part, a weft thread clamping jaw with an oblong shape in parallel relationship with the gripper shuttle movement, arranged underneath the shoelike main part, and a connecting arm
  • the improvement comprising said holding clamp jaws having end portions diverging from one another on the side of the gripper shuttle detent entry, the connecting arm being arranged adjacent the detent outlet end portion of the holding clamp.
  • each clamp half having a vertical supporting leaf connected to said main part and a resilient clamping leaf secured to said supporting leaf which also extends vertically with the lower end bearing against said main part, the upper ends of the resilient supporting leaves and of the resilient clamping leaves of both clamp halves being attached to means for alternatively moving the clamp in and out of the gripper shuttle path.
  • the improvement comprising the gripper shuttle detent having a head for opening the holding clamp jaws, said detent being provided with a recessed area situated underneath the head, for positioning the weft thread running from the gripper to the stationary supply for the weft thread.
  • each holding clamp having electric insulating means between both clamp halves with the exception of the jaw engagement area, electric connecting means for connecting said halves in a circuit for sending weft-loss monitoring pulses.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
US405981A 1972-10-12 1973-10-12 Weft thread holding device in a loom with fixed weft feeding Expired - Lifetime US3880200A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7236808A FR2202965B1 (enrdf_load_stackoverflow) 1972-10-12 1972-10-12

Publications (1)

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US3880200A true US3880200A (en) 1975-04-29

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Application Number Title Priority Date Filing Date
US405981A Expired - Lifetime US3880200A (en) 1972-10-12 1973-10-12 Weft thread holding device in a loom with fixed weft feeding

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US (1) US3880200A (enrdf_load_stackoverflow)
JP (1) JPS5858453B2 (enrdf_load_stackoverflow)
BE (1) BE805835A (enrdf_load_stackoverflow)
DE (1) DE2351380A1 (enrdf_load_stackoverflow)
FR (1) FR2202965B1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4875505A (en) * 1987-04-02 1989-10-24 Picanol N.V. Thread clamp

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2612207B1 (fr) * 1987-03-13 1989-06-16 Fabre Aime Dispositif coupe-fil pour metiers a tisser du type a reserves de trame fixes et a organes passe-trame lance
FR2664914A1 (fr) * 1990-07-17 1992-01-24 Fabre Aime Dispositif de pince pour la retenue du fil de trame dans les metiers a reserves de trame fixes.
CH688049A5 (de) * 1994-02-18 1997-04-30 Ulrich Sigrist Detektion von Fadenverlierern einer Projektilwebmaschine.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470919A (en) * 1966-10-15 1969-10-07 Giorgio Adolfo Grandi Device for the formation of the weft in bobbinless shuttle looms
US3717181A (en) * 1971-05-28 1973-02-20 Manta Looms with a stationary weft supply and a weft carrier with gripper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470919A (en) * 1966-10-15 1969-10-07 Giorgio Adolfo Grandi Device for the formation of the weft in bobbinless shuttle looms
US3717181A (en) * 1971-05-28 1973-02-20 Manta Looms with a stationary weft supply and a weft carrier with gripper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4875505A (en) * 1987-04-02 1989-10-24 Picanol N.V. Thread clamp

Also Published As

Publication number Publication date
FR2202965B1 (enrdf_load_stackoverflow) 1976-08-20
JPS4971258A (enrdf_load_stackoverflow) 1974-07-10
JPS5858453B2 (ja) 1983-12-26
BE805835A (nl) 1974-02-01
DE2351380A1 (de) 1974-04-25
FR2202965A1 (enrdf_load_stackoverflow) 1974-05-10

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