EP0281948A2 - Métier à tisser avec insertion de trame pneumatique - Google Patents

Métier à tisser avec insertion de trame pneumatique Download PDF

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Publication number
EP0281948A2
EP0281948A2 EP88103295A EP88103295A EP0281948A2 EP 0281948 A2 EP0281948 A2 EP 0281948A2 EP 88103295 A EP88103295 A EP 88103295A EP 88103295 A EP88103295 A EP 88103295A EP 0281948 A2 EP0281948 A2 EP 0281948A2
Authority
EP
European Patent Office
Prior art keywords
notch
flat
jet
reed
loom according
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.)
Withdrawn
Application number
EP88103295A
Other languages
German (de)
English (en)
Other versions
EP0281948A3 (fr
Inventor
Josef Hehle
Jochen Dr. Balken
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.)
Lindauer Dornier GmbH
Original Assignee
Lindauer Dornier GmbH
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 Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0281948A2 publication Critical patent/EP0281948A2/fr
Publication of EP0281948A3 publication Critical patent/EP0281948A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • D03D47/278—Guide mechanisms for pneumatic 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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3006—Construction of the nozzles
    • D03D47/302—Auxiliary nozzles

Definitions

  • the invention relates to a weaving machine with a pneumatic weft insertion, in which a number of individual support nozzles for blowing out the insertion medium is arranged distributed over the weaving width, and which is equipped with a profile reed projecting from the front edge of the reed against the fabric stop edge.
  • a guide channel for the weft In looms with pneumatic weft insertion, it is known to provide a guide channel for the weft.
  • a special comb can be provided on the reed, which comes out of the warp threads of the shed and enters again with the stop movement of the reed.
  • individual lamellae of the guide comb are designed as nozzles, from which the insertion medium is distributed over the weaving width to support the weft thread to be inserted, e.g. Air is blown out.
  • Such additional guide combs are complex and also relatively difficult because of the specially designed lamellae.
  • the constant insertion and removal of the guide comb has an unfavorable effect on the warp threads of the shed.
  • guide lamellae specially designed as nozzles
  • the profile of the rivet teeth generally has a straight course from which ramp-like noses project forward towards the stop edge of the fabric.
  • the profile shows an indentation between such an upper and lower projecting nose, the depth of which extends approximately to the line of the straight tooth course.
  • the flanks of the entry usually run in a straight line and usually parallel or also diverging outwards, the flank spacing determining the width of the guide channel mentioned for the weft thread.
  • the width of the guide channel should not be chosen too large.
  • a narrow guide channel has the disadvantage that for some types of weft, e.g.
  • the guide elements for the weft consist of a wire structure.
  • the guide elements consisting of wire structures can also be an integral part of flat reed wires, which also results in a profile reed in this example.
  • reed bars are shown in various embodiments, which form a guide channel due to their shape.
  • Support nozzles with slit-like outlet openings are provided which cover the open side of the guide channel and the weft thread to be inserted with their emerging and fan-like widening jet Place at a certain point on the guide channel, for example at a corner of the guide channel or on a flank of the guide channel. No details are given on the design of the nozzles themselves.
  • Needle-shaped auxiliary nozzles or support nozzles arranged at certain distances from one another along a guide channel are also described in DE-PS 29 37 182.
  • the needle-shaped auxiliary nozzles are provided with a longitudinal slit and directed at an acute angle to the axis of the guide channel against the open side of the guide channel in such a way that a wide air jet covers the entire opening of each guide lamella.
  • a number of individual openings arranged in the longitudinal direction at a small distance from one another can also be provided.
  • the invention was based on the object of further improving the thread guidance and reliably inserting weft threads of the most varied types, for example smooth yarns or nubbed yarns, and then also leading them properly can, if there is no closed guide channel, but only a one-sided row of projecting lugs.
  • the leadership of the Weft should also be ensured if no special deformations to influence the flow are provided on the rivet teeth or their projecting lugs.
  • the object is achieved by the characterizing features mentioned in claim 1. Developments and advantages of the invention emerge from the subclaims and the drawing.
  • the nozzle flow geometry of the support nozzles is selected such that the emerging medium, for example air, forms a compact, controlled flat jet, that is to say that the jet remains essentially in its given concentration and no uncontrolled flutter or change in the flow occurs in its flat part.
  • the arrangement of the air curtains can be such that successive flat rays are parallel or coaxial or possibly overlap like scales.
  • the above advantages of the simplified profile reed with only one nose are fully retained.
  • the flow distribution of the flat jet nozzles can be achieved in that a preferably crescent-shaped notch with a V-shaped cross section is provided at the jet outlet opening of the support nozzle.
  • Such a notch can easily be created, for example, by a grinding wheel. It is possible to arrange the notch more or less obliquely to the course of the pipe axis in the nozzle body, as required.
  • FIG. 1 shows a reed 1 with profiled reed teeth 2 as a section from the total length of the reed or from the weaving width.
  • the rivet teeth 2 have a straight course in their upper part, while in the lower part they contain a nose 3 projecting to the right in the direction of the stop movement of the reed or to the tissue stop edge.
  • the transition part between the straight course of the rivet teeth 2 and the projecting nose 3 is designated by 8; the weft thread 7 should run in it when the weft is inserted.
  • the closely spaced individual teeth of the Profilerietes are only hinted at.
  • support nozzles 4 are arranged in a manner not shown in detail at certain distances from one another over the weaving width.
  • the spacing of the support nozzles 4 forms sections which are designated by 9a, 9b.
  • the support nozzles 4 are pivoted together with the reed 1 when the weft thread is struck. It is therefore not necessary to go into this in particular.
  • FIG. 2 As seen against the direction of the shot, part of a support nozzle 4 is shown, in which an obliquely slit-like nozzle opening 5 is indicated.
  • the medium for example compressed air, flows out of this nozzle opening as a fan-like flat jet in an oblique position to the longitudinal axis of the support nozzle 4.
  • the support nozzles 4 can be adjusted according to FIG. 1 in such a way that their flat jets 6 emerge in the weft direction towards the subsequent support nozzle 4.
  • the beam direction of the successive flat beams is parallel or coaxial.
  • the shape of the fan-like flat rays 6 is only roughly indicated as a cross section in FIG.
  • the inner zone of the flat jet 6 facing the profile reed 1 experiences a slight inclination towards the profile reed 1.
  • the entire flat jet 6 can also be directed in such a way that it flows out of the support nozzle 4 with a slight inclination towards the profile rod 1 and strikes the front edge of the rivet teeth 2 in its further course.
  • the cross section of the flat rays 6 shown is not intended to indicate that the beam ends there, rather the flat rays extend somewhat further until they strike the rivet teeth. On In this way it is achieved that successive flat beams across the weaving width complement each other in the assigned sections 9a, 9b to form a closed air curtain covering the guide channel for the weft thread 7.
  • the successive flat beams 6 may overlap like scales.
  • FIG. 3 shows a side view of a rivet tooth 2 with a projecting nose 3.
  • the flat jet 6 shown in cross section is arranged obliquely in its position with respect to the ratchet tooth 2 so that the width of the jet fan essentially extends from the front edge of the nose 3 to the front edge in the straight part of the ratchet tooth 2.
  • the transition area 8 is covered by an air curtain.
  • This air curtain forms approximately the third side of a prismatic guide channel, the other sides of which are formed by the profile teeth on the one hand and by the profile lugs on the other.
  • the shape of the flat jet can be different, for example have a triangular or an approximately parabolic jet width.
  • the air distribution in the jet depth is advantageously such that the flat jet 6 has a central, somewhat reinforced core 6a, to which then laterally thinner jet surfaces, that is to say strips with a smaller jet depth, are connected.
  • the central core jet 6a emerging from a support nozzle 4 is directed so that it strikes the teeth of the reed 1 in the transition region 8.
  • This central core essentially contributes to the transport of the weft thread to be inserted, whereas the thinner side surfaces of the flat jet serve to shield and stabilize the thread and to accelerate it.
  • the opening angle of the fan-like flat jet 6 depends essentially on the reed dimensions the position and the mutual distance of the support nozzles and can be, for example, 15 °.
  • FIGS. 4a to 4c schematically show a support nozzle in which the jet outlet opening is provided with a notch in order to pass the required reinforced central area and the adjacent flat zones of shallower jet depth to the emerging air jet.
  • 4a shows an axial section along the section line A-A from FIG. 4b.
  • 4b is an uncut top view of FIG. 4a and
  • FIG. 4c shows a further axial section along the line C-C of FIG. 4a.
  • a plate 10 is placed here as a conclusion.
  • the shape of the plate can be arbitrary and can also be circular or octagonal, etc., for example. It is irrelevant in which way the plate is fastened to the support nozzle body, for example when the head is screwed on.
  • the inner bore 4b in the support nozzle body 4 runs along the tube axis 4a and has a diameter D. This inner channel or this bore 4b is closed at its end and ends, for example, with a conical part in the plate 10.
  • An elongated notch 11 is made in the upper end face of the plate 10. This notch 11 has a V-shaped cross section as shown in Fig.4c.
  • the depth H of the notch 11 is selected so that the tip of the V-shaped notch cross-section penetrates the upper wall of the bore 4b, thereby forming an outlet opening 12 for the bore 4b or the flow channel.
  • this opening 12 has at its end the opening diameter d which is equal to or smaller than the bore diameter D.
  • the length of the notch 11 is y and the greatest width of the notch the plate 10 denoted by x. The limitation of the notch 11 on the plate 10 is sharp.
  • the course of the notch base is assumed in the form of a circular arc in FIG. formed by a grinding wheel so that it appears crescent-shaped.
  • the notch 11 could also be straight and e.g. Lead straight and inclined from both sides to the jet outlet opening 12.
  • the opening 12 creates a stronger central air jet, while the laterally adjacent notch parts ensure a fan-like spread of the lateral jet parts with a small jet depth. This jet shape is more pronounced the narrower the notch width x or the more acute the V-shape of the notch.
  • the outlet opening 12 forms the slot-like nozzle opening 5 shown in FIG. 2.
  • a notch 11 in a plate 10 is indicated in the two figures 5a and 5b.
  • a rotating grinding wheel 13 which has a V-shaped profile on its circumference, a notch 11 can be made in the plate 10 in a simple manner.
  • Fig.5a is also indicated that the support nozzle body 4 can be bent and the final plate 10 is placed on the bent end portion of the support nozzle body 4.
  • the plate 10 which can be placed as an end part on the tube of a support nozzle body 4 is designed as a separate component and contains the end part of the bore 4b on its underside and that the notch 11 can be finished on the top, before the plate 10 is placed on the support nozzle body.
  • FIGS. 6a and 6b A further embodiment for a support nozzle is shown in FIGS. 6a and 6b.
  • a simple cylindrical tube is assumed as the support nozzle body 4, this tube being closed at its end.
  • the tube axis is again designated 4a.
  • a notch 11 is cut in from the side approximately according to FIG. 5 with a depth such that the deepest part of the V-shape penetrates the inner wall of the support nozzle body 4 and an outlet opening 12 is formed at this point.
  • its diameter d is again shown and the width of the notch is denoted by x and the length of the notch by y.
  • the notch 11 runs parallel to the axis 4a of the tubular support nozzle body 4.
  • it can of course also be arranged in an inclined position, such as e.g. emerges from Fig.2.
  • notches 11 are not only to be arranged on circular cylindrical support nozzle bodies 4 according to FIG. 6, but that they can just as well be arranged laterally on support nozzle bodies 4 with a flattened tube part, as shown in FIG.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP88103295A 1987-03-11 1988-03-03 Métier à tisser avec insertion de trame pneumatique Withdrawn EP0281948A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3707790 1987-03-11
DE3707790 1987-03-11
DE3801197A DE3801197A1 (de) 1987-03-11 1988-01-18 Webmaschine mit pneumatischem schussfadeneintrag
DE3801197 1988-01-18

Publications (2)

Publication Number Publication Date
EP0281948A2 true EP0281948A2 (fr) 1988-09-14
EP0281948A3 EP0281948A3 (fr) 1990-05-23

Family

ID=25853336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103295A Withdrawn EP0281948A3 (fr) 1987-03-11 1988-03-03 Métier à tisser avec insertion de trame pneumatique

Country Status (3)

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EP (1) EP0281948A3 (fr)
JP (1) JPH01104858A (fr)
DE (1) DE3801197A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014187732A1 (fr) * 2013-05-22 2014-11-27 Picanol Buse auxiliaire pour métier à tisser

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001288644A (ja) * 2000-04-04 2001-10-19 Tsudakoma Corp 緯入れ用サブノズル

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH499645A (de) * 1968-08-12 1970-11-30 Strake Maschf Nv Webmaschine
CH554435A (de) * 1973-06-25 1974-09-30 Rueti Ag Maschf Webmaschine mit einrichtungen zum eintragen der schussfaeden mittels eines fluidums.
DE2937182A1 (de) * 1978-09-15 1980-03-27 Toyoda Automatic Loom Works Webverfahren und webstuhl
GB2146049A (en) * 1983-06-15 1985-04-11 Saurer Diederichs Sa Reed with incorporated confiner for shuttleless loom with pneumatic weft insertion

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3234813C1 (de) * 1982-09-20 1984-01-19 Sulzer Ag Schußfadeneintragskanal für pneumatische Webmaschinen
DE3642712A1 (de) * 1986-09-30 1988-04-21 Dornier Gmbh Lindauer Riet mit profilierten zaehnen fuer webmaschinen mit pneumatischem schussfadeneintrag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH499645A (de) * 1968-08-12 1970-11-30 Strake Maschf Nv Webmaschine
CH554435A (de) * 1973-06-25 1974-09-30 Rueti Ag Maschf Webmaschine mit einrichtungen zum eintragen der schussfaeden mittels eines fluidums.
DE2937182A1 (de) * 1978-09-15 1980-03-27 Toyoda Automatic Loom Works Webverfahren und webstuhl
GB2146049A (en) * 1983-06-15 1985-04-11 Saurer Diederichs Sa Reed with incorporated confiner for shuttleless loom with pneumatic weft insertion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014187732A1 (fr) * 2013-05-22 2014-11-27 Picanol Buse auxiliaire pour métier à tisser
BE1021694B1 (nl) * 2013-05-22 2016-01-08 Picanol Hulpblaasmondstuk voor een weefmachine

Also Published As

Publication number Publication date
DE3801197A1 (de) 1988-09-29
EP0281948A3 (fr) 1990-05-23
JPH01104858A (ja) 1989-04-21

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