EP0268794A2 - Métier à tisser à jet d'air - Google Patents

Métier à tisser à jet d'air Download PDF

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Publication number
EP0268794A2
EP0268794A2 EP87114750A EP87114750A EP0268794A2 EP 0268794 A2 EP0268794 A2 EP 0268794A2 EP 87114750 A EP87114750 A EP 87114750A EP 87114750 A EP87114750 A EP 87114750A EP 0268794 A2 EP0268794 A2 EP 0268794A2
Authority
EP
European Patent Office
Prior art keywords
slot
tube
slots
jet loom
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.)
Ceased
Application number
EP87114750A
Other languages
German (de)
English (en)
Other versions
EP0268794A3 (fr
Inventor
Dirk Maes
Patrick Nuytten
Marnick Cardoen
Philippe Van Bogaert
Jozef Verhulst
Gilbert Dejonghe
Jozef Trioen
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.)
Picanol NV
Original Assignee
Picanol NV
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
Priority claimed from DE19863639867 external-priority patent/DE3639867C1/de
Application filed by Picanol NV filed Critical Picanol NV
Publication of EP0268794A2 publication Critical patent/EP0268794A2/fr
Publication of EP0268794A3 publication Critical patent/EP0268794A3/fr
Ceased legal-status Critical Current

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Classifications

    • 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 jet weaving machine with a weft thread in the main blowing nozzle and with a plurality of staggered nozzles arranged one behind the other in the transport direction of the weft thread, which are arranged on a sley and which are formed from straight, closed at their free ends and sharpened like blades, which are nearby the ends in an essentially flat side surface are provided with at least one blowing opening, the blowing direction of which is directed obliquely from below to the transport direction of the weft threads in a substantially U-shaped channel formed by reed blades.
  • the invention has for its object to provide for a jet weaving machine of the type mentioned at the beginning, relay nozzles which, on the one hand, ensure high directional stability of the blowing direction even at different overpressures, which generate the largest possible volume of air flow and which are also easy to produce.
  • blowing openings each have the shape of a slot running essentially transversely to the axis of the tube, the width of which is not greater than 0.8 mm and the side walls are profiled such that the smallest flow cross section on at least one side is bounded by an edge, the thickness of which is not greater than 0.2 mm.
  • the invention is based on the knowledge that for the blow-out direction, since supercritical conditions are always present due to the high air pressures of 2 to 7 bar, a physical phenomenon is decisive, which can be described as "critical flow cross-section". This is where the expansion of the air flowing in the relay nozzle begins.
  • the blowing direction of the resulting jet is not directly dependent on the direction of the opening, but rather is directed perpendicular to this "critical flow cross-section”.
  • An explosive expansion takes place at this critical flow cross-section.
  • the critical flow cross-section is not, or only in special cases, identical to the blow opening and also has the special property that the position of this critical flow cross-section can change depending on the overpressure.
  • the critical flow cross-section can both shift within the blowing opening and set obliquely to the axial direction of the blowing opening or even shift into the tube.
  • the lower the overpressure the further the critical flow cross-section shifts into the inside of the blow opening and also into the inside of the tubes.
  • the blowing direction of the blown compressed air jet is therefore constant for very large overpressure areas.
  • the critical flow cross section in the embodiment according to the invention lies in the essentially flat side surface, the cross section of the slot can even run asymmetrically to the essentially flat side surface, while the blowing direction nevertheless runs perpendicular to this side surface.
  • the advantage is obtained that the blown jet already has an enlarged surface at the outlet of the blowing opening, with which it comes into contact with the ambient air, so that a correspondingly large amount of secondary air is entrained and a large-volume jet is formed.
  • the advantage is obtained that the creation of such slot-like openings with respect to the manufacture a requires less effort than, for example, making a plurality of holes arranged in a sieve.
  • the sley (5) of a jet loom shown in a partial perspective view in FIG. 1 contains a shaft (21) which is driven by means of a drive (not shown) to oscillate in the direction of the double arrow.
  • a support profile (23) which extends parallel to the shaft (21) and carries the reed leaves (8) which guide the warp threads (19 and 20) between them.
  • a warp thread (19 or 20) runs between each of the reed leaves (8).
  • the warp threads (19, 20) are deflected upwards and / or downwards by means of a shed formation, whereby a shed (2) is formed in each case.
  • a weft thread (1) is then entered into this shed (2), which is then picked up by the reed blades (8) moving to a spreading device.
  • the shed position is then changed by bringing the warp threads (19, 20) into the opposite position, so that a new shed (2) is formed in which the next weft thread (1) is inserted.
  • the filling of the weft threads (1) takes place via a main blowing nozzle (3) which is connected to a compressed air source, not shown, and which is fastened with a holder on the carrier profile (23), so that the main blowing nozzle (3) with the Sley (5) moves.
  • the reeds (8) form on their front edges with the help of projections an essentially U-shaped channel (9) in which the weft thread (1) is brought to the other fabric edge.
  • relay nozzles (4) In order to ensure the transport of the weft thread (1) in the channel (9), an air flow is generated in the channel (9) by means of relay nozzles (4).
  • These relay nozzles (4) are arranged one behind the other at regular intervals in the transport direction of the weft thread (1) and are supplied with compressed air in groups.
  • the relay nozzles (4) which have the shape of straight tubes, are mounted on the carrier profile (23), which remains outside the respective shed (2) formed, into which only the ends of the relay nozzles (4) protrude.
  • Holders (25) are arranged on the carrier profile (23), which carry the relay nozzles (4) and which are supplied in groups with compressed air by a valve via a compressed air supply line (27).
  • An air flow is generated via the relay nozzles (4), which fills the channel (9) as completely and evenly as possible.
  • the individual relay nozzles should therefore blow out an air jet which on the one hand contains a relatively large volume and on the other hand is directed as precisely as possible.
  • the strength of the air flow in the channel (9), which is necessary for a perfect transport of the weft thread (1), depends on the material to be processed. For example, it is advisable to work with a significantly weaker air flow when processing a coarse cotton yarn than, for example, when processing a smooth filament thread. It is therefore necessary that the blowing air flows of the individual relay nozzles (4), which are dependent on the applied overpressure, are variable in their strength. Despite this variable strength, however, it must be ensured that the blowing direction is at least approximately constant.
  • relay nozzles (4) When designing the relay nozzles (4) it should also be noted that these relay nozzles (4) are subject to structural restrictions are thrown.
  • the relay nozzles (4) can therefore have only a relatively small extension, in particular transversely to the warp threads (19, 20.
  • the relay nozzles (4) are therefore formed from relatively thin tubes which also have a relatively small wall thickness of approximately 0.5 mm For this reason, it is not possible to design the blow-out openings of the relay nozzles (4) in the conventional manner as outlet nozzles which are designed to be favorable in terms of flow technology, in addition to the fact that the outside of the relay nozzles (4) must have as smooth a surface as possible so that the warp threads adhere to them (19, 20) do not get caught and can be damaged.
  • the relay nozzles (4) are arranged in the direction of the stop in front of the reed blades and offset downwards so that the air jets are blown into the channel (9) obliquely from below.
  • the relay nozzles (4) are aligned in such a way that the blown-out air jets are directed at an angle of approximately 10 ° in the transport direction of the weft thread (1).
  • the blowing opening is designed as a slot (7) which runs essentially transversely to the longitudinal axis of the relay nozzle (4) designed as a tube (10).
  • the tube (10) (FIGS. 2 to 10) has, at least in the area of the longitudinal slot (7), a longitudinal oval cross section, the greatest extent of which extends in the direction of the warp threads.
  • the tube (10) is sharpened in a cutting-like manner, although a rounding is provided instead of a sharp-edged cutting edge.
  • An essentially flat surface (6) is located in the area of the blow opening designed as a slot (7).
  • This flat surface (6) runs perpendicular to the blowing direction, ie at an angle of approximately 10 ° to the transport direction of the weft threads (1).
  • the slot (7) has a maximum width of 0.8 mm. It is also provided that the narrowest cross section of the slot (7), which forms the critical flow cross section, is located at a defined point, so that the blowing direction cannot change due to a pressure-dependent shift of the critical flow cross section within the blow-out opening.
  • the slot (7) is delimited by side walls which diverge from the inside to the outside. This forms an internal, sharp edge (11) which defines the critical flow cross section at which the expansion begins.
  • the blowing direction of the blown jet is thus perpendicular to the plane between the two inner edges (11) delimiting the slot (7).
  • Such a slot can be produced, for example, by spark erosion, in that a strip-like electrode, which corresponds in its thickness to the slot width and in its width to the slot length, is subjected to twice the erosion, the electrode in each case at a different angle of the flat surface (6) delivered to the relay nozzle (4) becomes. This type of delivery is indicated by the dashed lines in Fig. 4.
  • the slot (7) has its narrowest cross section and thus the critical flow cross section in the outside of the relay nozzle (4), i.e. in the flat area (6).
  • the side walls converge in the direction of flow.
  • This slot shape can also be produced by spark erosion by means of a strip-shaped electrode, which is also fed twice to the slot (7) at two different angles and thus creates the shape shown in FIG. 6.
  • the critical flow cross section is limited by two sharp-edged edges (12) which run in the longitudinal direction of the slot (7).
  • a precisely defined critical flow cross-section in the area of the slots (7) is achieved in that the wall thickness of the relay nozzle (4) in the area of the slots (7) through a recess (28, 29 ) is reduced to a fifth to a third, ie to a maximum of 0.2 mm.
  • the recess (28) with which the wall thickness in the area of the slot (7) is reduced is provided in the interior of the relay nozzle (4) on the side opposite the flat surface (6) .
  • the recess (29) which also reduces the wall thickness here, has been made from the flat side surface (6).
  • blow opening in the form of a slot (7) also ensures that the blown-out air jet already has a relatively large surface area at its beginning, which comes into contact with the ambient air. Based on these relatively large surface area is entrained in a corresponding amount of ambient air, so-called secondary air, so that even with a relatively small amount of air blown out, a relatively large-volume air jet is produced
  • a slot (7) is not sufficient to blow out a sufficient amount of air, it is provided that one or two additional openings are provided, which are also in the form of slots (17, 18) which are parallel to the slot (7 ) run.
  • These slots (17, 18) which are dimensioned corresponding to the slot (7) in width and designed with respect to the walls, are arranged at such a distance that webs remain between the individual slots (7, 17, 18) of the order of 0.3 to 1.5 times the width of the slots (7, 17, 18).
  • the slots (17, 18) which are further away from the closed end of the relay nozzle (4) designed as a tube (7) decrease in length.
  • a slot (7) is provided in the tube (10), which forms a relay nozzle (4), which has a substantially rectangular contour.
  • the slot (7) which runs transversely to the axis (33) of the tube (10), is delimited towards the sharpened free end of the tube (10) by a side wall (30) which is perpendicular to the essentially flat side surface (6) runs.
  • the opposite side wall (31) which also forms a smooth surface, is inclined at an angle of approximately 20 ° with respect to the essentially flat surface (6) such that the cross section of the slot converges from the inside to the outside.
  • the two end walls of the slot (7) run parallel to the longitudinal axis (33) and perpendicular to the side walls (30, 31).
  • the slot is only slightly rounded in the area of its corners between the end walls and the side walls (30, 31).
  • the slot (7) has a width between the side walls (30, 31) in the plane of the substantially flat surface, i.e. between the side wall (30) and the edge (32), which is approximately 0.7 mm.
  • the length of the slot (7) between the two end walls is approximately three to four times this width.
  • the tube (10) is mirror-symmetrically shaped with respect to its longitudinal axis, i.e. on the side opposite the essentially flat side surface (6) there is a corresponding essentially flat side surface.
  • These two flat side surfaces form an angle of approximately 20 ° with one another and thus an angle of approximately 10 ° to the axis (33) of the tube (10).
  • the distance between the center of the slot (7) and the free end of the tube is slightly more than three times the slot width between the side wall (30) and the edge (32).
  • the slot (7) which has an asymmetrical shape with respect to the essentially flat surface (6), can be created, for example, by means of spark erosion with a strip-shaped electrode.
  • the strip-shaped electrode has a length corresponding to the slot length and a width that is somewhat is smaller than the width of the slot (7).
  • This electrode is fed to the tube (10) once perpendicular to the essentially flat side surface (6), the side wall (30) and the regions of the end walls adjoining it being produced. Then, after tilting by an angle of 20 ° to the essentially planar side surface and, if necessary, an offset determining the slot width, the electrode is again fed to the tube.
  • a recess (35) is provided in the embodiment according to FIGS. 9 and 10 in the rear wall of the tube (10) opposite the slot (7).
  • the recess (35) has the shape of a flat notch, which has a depth of about 0.05 to 0.2 mm. The apex of this recess runs parallel to the slot (7).
  • the length of the recess corresponds approximately to the length of the slot.
  • the flanks of the notch-like depression have a flat angle to the inner wall.
  • Such a recess can be produced, for example, by inserting a corresponding, sharpened tool in the slot (7), through which the rear wall is pressed outwards accordingly.
  • the bump-like elevation that arises on the outside of the rear wall is then ground off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP87114750A 1986-11-21 1987-10-09 Métier à tisser à jet d'air Ceased EP0268794A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19863639867 DE3639867C1 (en) 1986-11-21 1986-11-21 Jet-weaving machine
DE3639867 1986-11-21
DE19863643058 DE3643058A1 (de) 1986-11-21 1986-12-17 Duesen-webmaschine
DE3643058 1986-12-17

Publications (2)

Publication Number Publication Date
EP0268794A2 true EP0268794A2 (fr) 1988-06-01
EP0268794A3 EP0268794A3 (fr) 1989-05-17

Family

ID=25849623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114750A Ceased EP0268794A3 (fr) 1986-11-21 1987-10-09 Métier à tisser à jet d'air

Country Status (3)

Country Link
US (1) US4794958A (fr)
EP (1) EP0268794A3 (fr)
DE (1) DE3643058A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0516587A1 (fr) * 1991-05-28 1992-12-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Tuyère auxiliaire dans un métier à jet d'air
EP0541489A1 (fr) * 1991-11-07 1993-05-12 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Tuyère auxiliaire dans un métier à jet

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2711099B2 (ja) * 1987-09-25 1998-02-10 日産テクシス株式会社 空気噴射式織機の補助ノズル
DE4029743A1 (de) * 1990-09-20 1992-04-30 Picanol Nv Verfahren und duesenanordnung zum reinigen von luftduesen und webblaettern bei luftduesen-webmaschinen
BE1012608A3 (nl) * 1999-04-14 2001-01-09 Picanol Nv Spuitmondstuk voor een weefmachine.
BE1015155A3 (nl) * 2002-10-23 2004-10-05 Picanol Nv Spuitmondstuk voor het ondersteunen van een inslagdraad in een weefmachine.
BE1015261A3 (nl) * 2002-12-19 2004-12-07 Picanol Nv Spuitmondstuk voor het ondersteunen van een inslagdraad bij een weefmachine.

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7005782A (fr) * 1970-04-21 1971-10-25
NL7406857A (nl) * 1974-05-21 1975-11-25 Rueti Te Strake Bv Spuitmondstuk in de vorm van een holle naald met een nabij de punt, in de zijwand daarvan aangebrachte spuitopening.
JPS5925889Y2 (ja) * 1978-09-15 1984-07-28 株式会社豊田自動織機製作所 ジエツトル−ムにおける補助流体噴射装置
FR2458022A1 (fr) * 1979-05-30 1980-12-26 Coflexip Conduite tubulaire flexible
NL8000836A (nl) * 1980-02-11 1981-09-01 Rueti Te Strake Bv Spuitmondstuk met afgeschermd aangebrachte spuitopening, bestemd voor een spoelloze weefmachine.
EP0053216B1 (fr) * 1980-11-28 1984-03-14 GebràœDer Sulzer Aktiengesellschaft Buse de soufflage auxiliaire pour métier à tisser à jet d'air
DE3204363A1 (de) * 1982-02-09 1983-08-11 Guenne Webmaschf Gmbh Verfahren und strahlduese zum transportieren eines schussfadens durch ein webfach mittels druckluft
JPS6075646A (ja) * 1983-10-01 1985-04-30 日産自動車株式会社 空気噴射式織機用補助ノズルとその製法
DE3370035D1 (en) * 1983-12-09 1987-04-09 Sulzer Ag Auxiliary nozzle for an air jet loom
JPH0684576B2 (ja) * 1984-02-17 1994-10-26 株式会社豊田自動織機製作所 流体噴射式織機における補助ノズル装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0516587A1 (fr) * 1991-05-28 1992-12-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Tuyère auxiliaire dans un métier à jet d'air
EP0541489A1 (fr) * 1991-11-07 1993-05-12 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Tuyère auxiliaire dans un métier à jet

Also Published As

Publication number Publication date
DE3643058A1 (de) 1988-06-30
EP0268794A3 (fr) 1989-05-17
US4794958A (en) 1989-01-03

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Inventor name: CARDOEN, MARNICK

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