US3465791A - Apparatus for assisting the jet insertion of a weft thread into the shed of a loom - Google Patents

Apparatus for assisting the jet insertion of a weft thread into the shed of a loom Download PDF

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Publication number
US3465791A
US3465791A US654222A US3465791DA US3465791A US 3465791 A US3465791 A US 3465791A US 654222 A US654222 A US 654222A US 3465791D A US3465791D A US 3465791DA US 3465791 A US3465791 A US 3465791A
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United States
Prior art keywords
shed
warp
jet nozzles
weft
reed
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
US654222A
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English (en)
Inventor
Hubert Peter Van Mullekom
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.)
MAS FAB L TE STRAKE NV
Original Assignee
Strake Maschf Nv
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Publication date
Application filed by Strake Maschf Nv filed Critical Strake Maschf Nv
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Publication of US3465791A publication Critical patent/US3465791A/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • 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

  • the apparatus is used for controlling and assisting the movement of a weft thread which is jetinserted into the shed in a path that is substantially equally distant from the warp planes and from the retracted reed.
  • the apparatus comprises a plurality of jet nozzles, each of which is arranged to extend into the shed adjacent to a corner of the triangular cross-section, and each of which has an orifice for discharging a jet of fluid.
  • Each orifice is directed to discharge fluid substantially longitudinally of the shed, and the distance of the orifice from the center of a circle inscribed in the triangular cross-section of the shed is substantially as great as the radius of the circle.
  • the invention relates to a device for assisting the jet insertion of a weft thread into the shed of a loom, comprising a number of jet nozzles in front of the reed, which jet nozzles create a jet of a fluid under pressure within the shed when the reed remains in its distant position, for assisting in inserting a weft into the shed.
  • jet nozzles it is also known to situate the jet nozzles in such a manner that the jets leaving the nozzles are situated in the path of the weft to be inserted.
  • the jet nozzles can move between the warp threads into and out of the shed.
  • a weft to be inserted into the shed prefers to seek the jets leaving the jet nozzles owing to which the position of the weft to be inserted is in some measure localized.
  • the object of the invention is to eliminate the above mentioned drawbacks, and a loom according to the invention is characterized in that the jet nozzles are situated near one or more corners of the shed, which jet nozzles are eccentrically situated with respect to an inscribed circle within a triangle, which is formed by the warp sheets and the reed.
  • the triangle defined by the warp sheets and the reed is perpendicular to the conveying direction of the weft, which Weft preferably is conveyed through the centre of the inscribed circle, because in this position the distance from the weft to be launched to the warp sheets as well as the distance from the weft to the reed is as large as possible.
  • jet nozzles are situated on the bisectrices of the angles in the corners of the shed and on or outside the inscribed circle in the triangle defined by the upper and lower warp sheets and the reed in a retracted position.
  • the jet nozzles are provided in a blade shaped mounting which mounting is provided with a single laterally directed exhaust opening, situated in or near the plane which bisects the angle formed by the upper and lower warp sheets.
  • jet nozzles may be also provided in the corners of the shed near the reed and the jet nozzles in the corners near the reed may be arranged, in the direction of the weft, between adjacent pairs of the jet nozzles in the corner of the shed formed by the upper and lower warp sheets.
  • the lateral openings of the jet nozzles are directed in such a manner that the jet streams leaving these openings will have a slight lateral component which is situated in a plane formed by the bisectrices of the angles in the concerning corners.
  • FIG. 1 is a cross section through the reed of a loom according to the invention.
  • FIG. 2 shows a sectional view taken on the line IIII in FIG. 1;
  • FIG. 3 is a cross section similar to that shown in FIG. 1 but in diagrammatic form, showing the arrangement of jet nozzles in each corner of the shed and
  • FIG. 4 is a sectional view taken on the line IVIV in FIG. 3.
  • warp sheets 1a and 1b are maintained momentarily in diverging warp planes in the positions shown.
  • the positions of the warp sheets are reversed periodically, but between reversals one of the warp sheets is maintained momentarily in the upper warp plane, and the other warp sheet is maintained momentarily in the lower warp plane.
  • the upper Warp sheet 1a that particular warp sheet which is momentarily maintained in the upper warp plane
  • the lower warp sheet 1b that particular warp sheet which happens to be momentarily maintained in the lower warp plane.
  • the shed is formed by an upper warp sheet 1a and a lower warp sheet 1b.
  • the warp sheet threads 1a and the warp sheet 1b come together at the end of the shed and merge into the fabric 2.
  • the warp sheets 1a and 1b thus form a sharp angle at the end of the shed near the fabric 2.
  • Opposite to the fabric the shed is limited by the blades 3 of the reed.
  • the reed blades 3 are fastened in a lay beam 4 and a reed cap 5 in a manner as is usual in reed constructions.
  • baflle plate 6 is situated immediately below the lower warp sheet 1b and a bafile plate 7 is arranged immediately above the upper warp sheet In.
  • the spaces between the warps threads are thus covered by the baflie plates in order to obtain a good flow of the conveying medium for the weft within the shed.
  • baffle plate 6 is fastened to the lay beam 4 and the bafile plate 7 is fastened to the reed cap 5, the reed being movable between the retracted position in which it is shown in FIG. 1 and the beating position indicated in phantom lines in FIG. 1.
  • a weft thread is jet-inserted into the shed, from an open end of the shed at one side of the warp, while the parts are in the positions shown in FIG. 1.
  • a weft thread which is to be inserted into the shed will be preferably launched in the central part of the shed where the distance between the weft and the Warp sheets and further between the weft and the blades 3 of the reed is as large as possible, so that the weft thread is jet-inserted into the shed in a path that is substantially equidistant from the warp sheets and from the retracted reed, and is thus near the centre of an inscribed circle in the triangle formed by the upper warp sheet 1a, the lower warp sheet 1b and the blades of the reed.
  • the concerning inscribed circle is indicated by the reference numeral 8 in FIG. 1.
  • the jet nozzles are not situated near the centre of the inscribed circle 8 but extend into the shed near a corner of the triangular cross-section of the shed.
  • the jet nozzles are situated near that corner, which is formed by the upper warp sheet 1a and the lower warp sheet 1b near the fabric 2.
  • the jet nozzles are in the form of blades 9, situated on the baffle 6.
  • the blades are shaped in such a manner that they have a sharp edge which can easily penetrate between the threads of the lower warp sheet 1b into the shed.
  • a simple discharge orifice is arranged in the lateral side wall of the blades 9a (FIG. 2).
  • the orifice 10 is adapted to discharge a jet of the fluid under pressure, preferably air under pressure, which streams out of this orifice.
  • the blades 9a and 9a are applied to assist and control the movement of a weft thread which is being jet-inserted from the right side or from the left side of the shed.
  • a number of jet nozzles or blades 9a are regularly interspaced at intervals longitudinally of the shed.
  • the admittance of fluid through the channel 11 is interrupted and the fluid, such as air under pressure, is admitted to the channel 12 and further to the jet nozzles or blades 9a.
  • the admittance of the fluid to the channels 11 and 12 can be regulated by means of control valves known per se, which valves are actuated by a movable part, which is synchronously driven by the main shaft of the loorn.
  • one single blade adapted as a jet nozzle can be provided; however, this blade is provided with two orifices.
  • These jet nozzles consisting of a single blade having two orifices, are indicated by the reference numeral 912 in FIG. 2 and the orifices in the side walls of the blades are indicated by the reference numerals 10 and 10".
  • the orifice 10 is connected to the channel 11 and the orifice 10" is connected to the channel 12.
  • the jets of the fluid, which streams out of the orifices are indicated by lines 13 in FIG. 2.
  • jet nozzles can also be situated in the other corners of the shed as indicated in FIG. 3.
  • jet nozzles 14 and 15 are provided insides the jet nozzles 9.
  • the jet nozzles 14 are situated in that corner of the shed which is formed by the plane at the upper warp sheet In and the blades 3 of the reed.
  • the jet nozzles 15 are situated in that corner of the shed which is formed by the plane at the lower warp sheet 1b and the blades 3 of the reed.
  • the jet nozzles 9, 14 and 15 can be alternately arranged as indicated in FIG. 4.
  • Each of the blades has an orifice that lies substantially in a plane bisecting the angle at the corner of the triangular crosssection of the shed, and is directed to discharge fluid in a direction substantially parallel to such plane but at a slight angle to the path of the inserted weft thread, as indicated in FIG. 4.
  • Each of the orifices lies substantially on or outside of a circle inscribed in the triangular crosssection of the shed, so that the distance of each orifice from the center of such circle is substantially as great as the radius of the circle.
  • the number of the jet nozzles required for a given width of the loom increases as the velocity at which the warp thread is inserted increases.
  • FIG. 2 illustrates an arrangement in which a single jet nozzle 9b or a pair of jet nozzles 9a and 9a are provided in only one corner of the shed opposite every fifteenth blade of the reed.
  • FIG. 4 illustrates an arrangement which permits the warp thread to be inserted at a still higher velocity, in which the jet nozzles are located in all three corners of the shed, opposite every fifth blade of the reed.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Looms (AREA)
US654222A 1966-07-22 1967-07-18 Apparatus for assisting the jet insertion of a weft thread into the shed of a loom Expired - Lifetime US3465791A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB33136/66A GB1197173A (en) 1966-07-22 1966-07-22 Improvements in Jet Looms

Publications (1)

Publication Number Publication Date
US3465791A true US3465791A (en) 1969-09-09

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ID=10349010

Family Applications (1)

Application Number Title Priority Date Filing Date
US654222A Expired - Lifetime US3465791A (en) 1966-07-22 1967-07-18 Apparatus for assisting the jet insertion of a weft thread into the shed of a loom

Country Status (7)

Country Link
US (1) US3465791A (cs)
BE (1) BE701635A (cs)
CH (1) CH454761A (cs)
DE (1) DE1710322C3 (cs)
GB (1) GB1197173A (cs)
NL (1) NL6709765A (cs)
NO (1) NO122360B (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565122A (en) * 1968-04-10 1971-02-23 Vyzkummy A Vyvojovy Ustav Z Vs Comblike guide means for jet looms
FR2066365A5 (cs) * 1969-10-22 1971-08-06 Strake Maschf
US3818952A (en) * 1969-08-07 1974-06-25 G Vermeulen Jet operated weaving machine
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
US4787423A (en) * 1985-07-05 1988-11-29 Elitex Koncern Textilniho Strojirenstvi Method of and device for inserting weft yarn in jet looms
USRE32916E (en) * 1969-10-22 1989-05-02 Method for transporting a weft thread through a weaving shed and a loom for performing said method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432567A1 (fr) * 1978-08-01 1980-02-29 Saurer Diederichs Sa Relais actif pour machine a tisser sans navette a insertion de trame pneumatique
EP0233836A1 (de) * 1986-02-19 1987-08-26 GebràœDer Sulzer Aktiengesellschaft Strahlwebmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139118A (en) * 1958-05-09 1964-06-30 Svaty Vladimir Pneumatic weft guides for looms
US3161209A (en) * 1959-05-25 1964-12-15 Scheffel Walter Textile looms
US3162215A (en) * 1962-12-14 1964-12-22 Saito Hifumi Healds for a jet loom
FR1449084A (fr) * 1964-07-09 1966-08-12 Métier à tisser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139118A (en) * 1958-05-09 1964-06-30 Svaty Vladimir Pneumatic weft guides for looms
US3161209A (en) * 1959-05-25 1964-12-15 Scheffel Walter Textile looms
US3162215A (en) * 1962-12-14 1964-12-22 Saito Hifumi Healds for a jet loom
FR1449084A (fr) * 1964-07-09 1966-08-12 Métier à tisser

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565122A (en) * 1968-04-10 1971-02-23 Vyzkummy A Vyvojovy Ustav Z Vs Comblike guide means for jet looms
US3818952A (en) * 1969-08-07 1974-06-25 G Vermeulen Jet operated weaving machine
FR2066365A5 (cs) * 1969-10-22 1971-08-06 Strake Maschf
US3705608A (en) * 1969-10-22 1972-12-12 Geert Jan Vermeulen Method for transporting a weft thread through a weaving shed and a loom for performing said method
USRE32916E (en) * 1969-10-22 1989-05-02 Method for transporting a weft thread through a weaving shed and a loom for performing said method
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
US4787423A (en) * 1985-07-05 1988-11-29 Elitex Koncern Textilniho Strojirenstvi Method of and device for inserting weft yarn in jet looms

Also Published As

Publication number Publication date
DE1710322A1 (de) 1971-09-30
NO122360B (cs) 1971-06-14
DE1710322C3 (de) 1975-04-03
NL6709765A (cs) 1968-01-23
GB1197173A (en) 1970-07-01
CH454761A (de) 1968-04-15
DE1710322B2 (de) 1974-08-15
BE701635A (cs) 1968-01-02

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