EP2014808B1 - Dispositif d'insertion du fil de trame - Google Patents

Dispositif d'insertion du fil de trame Download PDF

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Publication number
EP2014808B1
EP2014808B1 EP20080010745 EP08010745A EP2014808B1 EP 2014808 B1 EP2014808 B1 EP 2014808B1 EP 20080010745 EP20080010745 EP 20080010745 EP 08010745 A EP08010745 A EP 08010745A EP 2014808 B1 EP2014808 B1 EP 2014808B1
Authority
EP
European Patent Office
Prior art keywords
weft
thread guide
tubular component
projections
nozzle
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.)
Not-in-force
Application number
EP20080010745
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German (de)
English (en)
Other versions
EP2014808A2 (fr
EP2014808A3 (fr
Inventor
Koji Yamamura
Hideki Banba
Gu Jian c/o Tsudakoma Zhong (Shanghai) Co., Ltd
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.)
Tsudakoma Shanghai Co Ltd
Tsudakoma Corp
Original Assignee
Tsudakoma Shanghai Co Ltd
Tsudakoma Industrial Co Ltd
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Publication date
Application filed by Tsudakoma Shanghai Co Ltd, Tsudakoma Industrial Co Ltd filed Critical Tsudakoma Shanghai Co Ltd
Publication of EP2014808A2 publication Critical patent/EP2014808A2/fr
Publication of EP2014808A3 publication Critical patent/EP2014808A3/fr
Application granted granted Critical
Publication of EP2014808B1 publication Critical patent/EP2014808B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D03D47/3013—Main nozzles

Definitions

  • the present invention relates to weft insertion nozzles in fluid jet looms, and particularly, to a technology for preventing a weft yarn from falling out of a weft insertion nozzle (so-called weft fall-out) in response to repulsive force generated at the time of a weft cutting process.
  • a weft thread insertion nozzle for an air jet loom which includes an axially aligned thread supply tube and a mixing tube within a housing.
  • Japanese Unexamined Utility Model Registration Application Publication No. 51-124159 (which will be referred to as Patent Document 1 hereinafter) and Japanese Unexamined Patent Application Publication No. 11-200193 (which will be referred to as Patent Document 2 hereinafter) disclose aweft-fall-out preventing unit in a fluid jet loom, which is for preventing a weft yarn from falling out of a weft insertion nozzle after a beating process.
  • Patent Document 1 discloses a technology in which a plurality of linear members such as nylon strings or metal wires are mounted to a downstream end of a weft insertion nozzle in a flow direction of compressed fluid, such that these linear members are arranged in a converged manner around an outlet of the weft insertion nozzle.
  • This allows a weft yarn to be constantly in contact with the linear members. Consequently, when the weft yarn is cut and separated from a woven cloth after a beating process, the weft yarn can be caught by the linear members even if the weft yarn tries to move in the opposite direction to the weft-insertion direction in response to a repulsive force generated at the time of the weft cutting process. Accordingly, this prevents the weft yarn from moving backwards.
  • Patent Document 1 because the weft yarn is constantly in contact with the linear members, the technology disclosed in Patent Document 1 can lead to problems such as an unstable weft-insertion process or damages to the weft yarn.
  • Patent Document 2 discloses a technology in which a weft holding mechanism is disposed within a weft insertion nozzle at a position upstream of a thread guide and holds a weft yarn by means of an air jet.
  • This weft holding mechanism is provided in a base body that connects a yarn guide and a nozzle body.
  • the weft holding mechanism has air jet holes located between the yarn guide and the nozzle body and facing each other across a weft traveling path, and a weft holding portion having a plurality of through holes extending through an inner wall of the base body.
  • the weft holding mechanism emits air through the air jet holes at a predetermined timing so as to press and hold a weft yarn against the weft holding portion, thereby preventing the weft yarn from moving backwards at the time of a weft cutting process.
  • Patent Document 2 is problematic in that the structure thereof is complex due to requiring a mechanism for controlling the air jet, and that periodical cleaning is necessary to prevent the weft holding mechanism from becoming dysfunctional as a result of the through holes getting filled with lint.
  • the present invention provides a weft insertion nozzle (1) in a fluid jet loom, in which a tubular component (51a, 51b, 51c, 51d, 51e) having a through hole (50a, 50b, 50c, 50d, 50e) and a cylindrical section (55a, 55b, 55c, 55d, 55e) is fitted within or around a thread guide (3), the cylindrical section (55a, 55b, 55c, 55d, 55e) at least having a tubular shape at one end in an axial direction thereof.
  • An inner periphery surface of one of the tubular component (51a, 51b, 51c, 51d, 51e) and the thread guide (3) substantially serves as a weft guiding path (5) in an area where the tubular component (51a, 51b, 51c, 51d, 51e) is disposed.
  • the one of the tubular component (51a, 51b, 51c, 51d, 51e) and the thread guide (3) has a downstream end in a weft-insertion direction that is provided with a plurality of projections (11) arranged in a circumferential direction, each projection (11) being tapered from a base end (15) towards a tip thereof.
  • each notch (41) is defined by opposing sides (16) of an adjacent pair of the projections (11) and by the base end (15), and is tapered towards the base end (15). Accordingly, the weft yarn (9) can be prevented from moving further, thereby preventing the weft yarn (9) from falling out of the nozzle (1).
  • the weft insertion nozzle (1) is configured to prevent such a backward movement of the weft yarn (9) by having the projections (11) projected towards one (axial) end of the thread guide (3). This means that, during a weft insertion process, no resistance force is generated against the weft yarn (9) being discharged by fluid jet, thereby preventing the weft yarn (9) from being damaged.
  • the tubular component (51a, 51e) may be fitted within or around an end portion (10) of the thread guide (3) so that the end portion (10) of the thread guide (3) has a two-tiered structure in a radial direction thereof.
  • the one that has the downstream end provided with the plurality of projections (11) arranged in the circumferential direction may be one of the end portion (10) of the thread guide (3) and the tubular component (51a, 51e) that is disposed at an internal side of the two-tiered structure.
  • the moving weft yarn (9) cut and separated from a woven cloth can be properly caught by the projections (11) provided at one end of the thread guide (3) even if the weft yarn (9) starts to move backward towards the upstream side of the weft insertion nozzle (1) due to its own elasticity.
  • the weft yarn (9) can be stopped from moving, thereby preventing the weft yarn (9) from falling out of the nozzle (1).
  • the other one of the end portion (10) of the thread guide (3) and the tubular component (51a, 51e) that is disposed at an external side of the two-tiered structure has a downstream end surface (52) in the weft-insertion direction.
  • the base end (15) of each projection (11) may be positioned upstream relative to the downstream end surface (52).
  • this can reduce the degree of exposure of the notches (41) between the projections (11) with respect to an orifice flow channel (40). Therefore, the amount of fluid escaping into the weft guiding path (5) through the notches (41) can be minimized, whereby a stable fluid flow can be created in the weft-insertion direction. As a result, this allows for a favorable weft-insertion process and a stable operation of the loom. Accordingly, the weft conveying force of the weft insertion nozzle (1) can be prevented from deteriorating.
  • the end portion (10) of the thread guide (3) may have a step section (56a, 56e) serving as a thin-walled section.
  • the tubular component (51a, 51e) may be fitted to the step section (56a, 56e).
  • tubular component (51a, 51e) can be properly positioned in the axial direction with respect to the thread guide (3). This can prevent the axial position of tubular components (51a, 51e) from varying at the manufacturing stage of thread guides (3), thereby reducing the percent defective of weft insertion nozzles (1) and thus improving the yield rate.
  • the tubular component (51b, 51c, 51d) may be fitted within the thread guide (3).
  • the one having the downstream end provided with the plurality of projections (11) arranged in the circumferential direction may be the tubular component (51b, 51c, 51d).
  • the moving weft yarn (9) cut and separated from a woven cloth can be properly caught by the projections (11) provided at one end of the thread guide (3) even if the weft yarn (9) starts to move backward towards the upstream side of the weft insertion nozzle (1) due to its own elasticity.
  • the weft yarn (9) can be stopped from moving, thereby preventing the weft yarn (9) from falling out of the nozzle (1).
  • the tubular component (51a, 51b, 51c, 51d) may have a cylindrical shape such that the through hole (50a, 50b, 50c, 50d) thereof has a fixed inside diameter and that the tubular component (51a, 51b, 51c, 51d) has a fixed outside diameter over an entire length thereof in the axial direction.
  • this facilitates the machining process of the tubular component (51a, 51b, 51c, 51d) and is thus advantageous for mass production.
  • the tubular component (51c, 51d) may be provided with a flange (57c, 57d) located upstream of the cylindrical section (55c, 55d) in the weft-insertion direction and connected to the cylindrical section (55c, 55d).
  • the thread guide (3) may be provided with a base surface (54c, 54d) extending outward in a radial direction.
  • the tubular component (51c, 51d) may be disposed such that a downstream-facing surface of the flange (57c, 57d) in the weft-insertion direction abuts on the base surface (54c, 54d).
  • tubular component (51c, 51d) can be readily positioned at a predetermined location within the weft guiding path (5) of the thread guide (3). This can prevent the axial position of tubular components (51c, 51d) from varying at the manufacturing stage of thread guides (3), thereby reducing the percent defective of weft insertion nozzles (1) and thus improving the yield rate.
  • a weft insertion nozzle 1 according to the present invention is used in a fluid jet loom.
  • the weft insertion nozzle 1 according to the present invention can be roughly classified into two types depending on the attachment position of a tubular component serving as a weft-fall-out preventing component 53 for preventing a weft yarn from falling out of the nozzle, which is a characteristic component of the invention.
  • one type is such that a tubular component (51a, 51e) is attached to an end portion 10 of a thread guide 3
  • another type is such that a tubular component (51b, 51c, 51d) is attached to an arbitrary position of a weft guiding path 5 within the thread guide 3.
  • Figs. 1 and 2 illustrate a weft insertion nozzle (main nozzle) of an air jet loom and a peripheral area thereof, the air jet loom being an example of a fluid jet loom to which the present invention can be applied.
  • the weft insertion nozzle 1 mainly includes a nozzle body 2 having an insertion hole 4, a thread guide 3 inserted in the insertion hole 4, an orifice member 12 that accelerates air serving as compressed fluid, and a pipe 13 having a hollow section where a weft yarn 9 and the air meet.
  • the insertion hole 4 forms a through hole constituted by a first insertion hole 33 through which the orifice member 12 extends and a second insertion hole 34 in which the pipe 13 is fitted, the first insertion hole 33 and the second insertion hole 34 being coaxially aligned with each other.
  • the first insertion hole 33 has an female screw portion 31 at the inner periphery near an open end thereof, which is provided for attaching the thread guide 3 thereto.
  • each of the components are composed of, for example, a metallic material, other materials that are resistant to abrasion, such as a ceramic material, may also be used. Moreover, the components may be fabricated by known methods such as cutting, electric discharge machining, and molding.
  • the nozzle body 2 is composed of an aluminum material
  • the thread guide 3, the orifice member 12, and the pipe 13 are composed of a stainless steel material.
  • the thread guide 3 has therein a weft guiding path 5 for the weft yarn 9, which extends in the axial direction of the thread guide 3.
  • the weft guiding path 5 tapers from the entrance to a midsection of the thread guide 3 in the axial direction, and has a fixed inside diameter from the midsection onward.
  • the outer periphery of the thread guide 3 includes a large-diameter section 6 extending in the axial direction from the entrance and having a male screw portion 32 engageable to the female screw portion 31 of the insertion hole 4, a small-diameter section 7 located downstream of the large-diameter section 6 in the weft-insertion direction, and a needle section 8 located downstream of the small-diameter section 7.
  • the needle section 8 has a part where an outside diameter thereof tapers downstream and then extends to the downstream end of the thread guide 3.
  • the small-diameter section 7 and the needle section 8 have disposed therebetween a plurality of rectifier fins 29 extending outward radially from the thread guide 3.
  • Each adjacent pair of rectifier fins 29 has a rectifying flow channel 28 therebetween.
  • the thread guide 3 is inserted in the first insertion hole 33 of the nozzle body 2, and the male screw portion 32 of the thread guide 3 is engaged to the female screw portion 31 so that the thread guide 3 is attached to the nozzle body 2 in a hermetically sealed state.
  • a space surrounded by the small-diameter section 7, the needle section 8, and the insertion hole 4 (first insertion hole 33) of the nozzle body 2 define an annular flow channel 27.
  • the nozzle body 2 has a connector 26 attached thereto, which is connected to a duct 25, and is provided with a flow channel (not shown) extending from a compressed fluid source (not shown) to the duct 25 and the annular flow channel 27.
  • the duct 25 is connected to an output port of an electromagnetic control valve (not shown) that controls the fluid supplied from the compressed fluid source (not shown). Specifically, at a predetermined weft-insertion timing, the electromagnetic control valve allows compressed air to flow from the duct 25 and into the annular flow channel 27 through the connector 26. Subsequently, the compressed air is rectified by the rectifier fins 29 in the rectifying flow channel 28 and is then accelerated by an orifice flow channel 40, so as to be emitted from an outlet 30.
  • the orifice flow channel 40 is defined by an outward-facing guide surface 8a of the needle section 8, the first insertion hole 33, and an inward-facing guide surface 12a of the orifice member 12.
  • the weft yarn 9 inserted into the weft guiding path 5 from a yarn guide 14 is pulled out from the thread guide 3 in response to negative pressure created as a result of the air emitted from the outlet 30.
  • the weft yarn 9 then joins the air flowing through the hollow section of the pipe 13, so as to be discharged from the opening of the pipe 13 together with the air.
  • the discharged weft yarn 9 is inserted into a shed 21 formed by warp yarns 20, is beaten by a reed 22, and is separated from a woven cloth 24 with a cutter 23.
  • the yarn guide 14 provided at the entrance of the weft guiding path 5 of the thread guide 3 has a guide surface with a diameter smaller than the inside diameter of the entrance of the weft guiding path 5.
  • the yarn guide 14 is formed of an abrasion-resistant material such as mail glass.
  • a downstream end portion 10 of the thread guide 3 is fitted with a tubular component 51a which is a characteristic component of the present invention.
  • One end of the tubular component 51a is provided with a plurality of projections 11 arranged in the circumferential direction of the tubular component 51a.
  • Fig. 2 shows an example where the tubular component 51a is fitted within the end portion 10 of the thread guide 3 such that the end portion 10 of the thread guide 3 has a two-tiered structure in the radial direction.
  • a tubular component 51e may be fitted around the end portion 10 of the thread guide 3 to give the end portion 10 of the thread guide 3 a two-tiered structure in the radial direction.
  • the projections 11 are arranged in the circumferential direction of the downstream end, as viewed in the weft-insertion direction, of the internally-disposed component of the tubular component 51a or 51e and the end portion 10 of the thread guide 3, namely, the downstream end of the component whose inner periphery surface substantially serves as the weft guiding path 5.
  • Figs. 3A and 3B show an example where the tubular component 51a is fitted within the end portion 10 of the thread guide 3, and the projections 11 are provided at one end of the tubular component 51a.
  • the tubular component 51a has a through hole 50a having a fixed inside diameter over its entire length in the axial direction, and a cylindrical section 55a having a fixed outside diameter.
  • the downstream end of the tubular component 51a in the weft-insertion direction has the projections 11 arranged in the circumferential direction.
  • Each projection 11 is tapered from a base end 15 towards a tip thereof.
  • the projections 11 are arranged at a fixed pitch in the circumferential direction based on conditions to be described hereinafter.
  • the adjacent projections 11 have notches 41 therebetween.
  • the weft yarn 9 When the weft yarn 9 is pulled upstream at the time of a cutting process performed after a beating process, the weft yarn 9 can be caught in and held by at least one of these notches 41.
  • the projections 11 are integrated with the tubular component 51a and can be formed by cutting out the downstream end of the tubular component 51a in the weft-insertion direction using a known method such as electric discharge machining.
  • the end portion 10 of the thread guide 3 has an inner step section 56a therein that defines a thin-walled section, such that the end portion 10 has a stepped structure with a base surface 54a facing downstream.
  • the tubular component 51a is given an outside diameter that allows the tubular component 51a to be engageable to the inner periphery of the thin-walled section of the thread guide 3.
  • the tubular component 51a has an upstream end surface in the weft-insertion direction that abuts on the base surface 54a, so as to be fitted within the inner step section 56a of the thread guide 3.
  • the inside diameter of the through hole 50a in the tubular component 51a is preferably equal to the inside diameter of the weft guiding path 5 in the end portion 10 of the thread guide 3.
  • the inner periphery surface of the through hole 50a of the tubular component 51a communicates with the weft guiding path 5 of the thread guide 3 and substantially serves as the weft guiding path 5 at the end portion 10 of the thread guide 3.
  • the tubular component 51a is fitted within the thread guide 3 such that the base end 15 of each projection 11 is positioned upstream relative to a downstream end surface 52 of the end portion 10 of the thread guide 3.
  • This can reduce the degree of exposure of the notches 41 with respect to the orifice flow channel 40. Consequently, of the air flow accelerated by the orifice flow channel 40, the amount of air escaping into the weft guiding path 5 through the notches 41 provided between the projections 11 can be minimized, whereby a stable air flow can be created in the weft-insertion direction. As a result, this allows for a stable weft-insertion process and prevents the weft conveying force of the weft insertion nozzle 1 from deteriorating.
  • the projections 11 are formed by cutting the downstream end of the tubular component 51a in the axial direction by a known method such as electric discharge machining, so that each projection 11 is given a length H from the tip thereof.
  • a known method such as electric discharge machining
  • each projection 11 is formed so as to be tapered from the base end 15 to the tip and to have a length a in the circumferential direction at an apex 17 defining the tip of the projection 11.
  • each projection 11 has two sides 16 connected to the base end 15 serving as the base surface, the flat apex 17 connected to the two sides 16, an inner periphery surface 43 connected to the sides 16 and the apex 17 and continuing from the inner periphery surface of the through hole 50a extending from upstream in the weft-insertion direction, and an outer periphery surface 42 connected to the sides 16 and the apex 17 and continuing from the outer periphery surface of the cylindrical section 55a.
  • the spaces defined by pairs of opposing sides 16 and the base ends 15 serve as the notches 41 that communicate with the weft guiding path 5.
  • the number of projections 11 provided is 4 or more, and preferably, between 6 to 30 inclusive to give the projections 11 a structure most suitable for hooking a weft yarn 9.
  • the projections 11 are arranged while being separated from each other by a certain distance in the circumferential direction. This distance between the tips of the adjacent projections 11 is set such that a weft yarn 9 can be inserted into each of the notches 41 provided between the adjacent projections 11.
  • the downstream end of the tubular component 51a has an inside radius r1 of 1 to 2 mm, and preferably has an inside radius equal to that of the weft guiding path 5 of the thread guide 3. Moreover, the downstream end of the tubular component 51a has a wall thickness t1 that is smaller than or equal to that of the thread guide 3. In detail, the wall thickness t1 is between 0.2 mm to 0.5 mm.
  • the number of projections 11, the pitch P of the projections 11, the length a of each projection 11 at the apex 17 in the circumferential direction, and the height H (distance between the apex 17 and the base end 15) of each projection 11 are set to values most suitable for hooking a weft yarn 9 on the basis of the inside radius r1 and the wall thickness t1 of the tubular component 51a, and the thickness of the weft yarn used.
  • the above values are set so as to satisfy the following conditions obtained from experience.
  • an appropriate number of projections 11 to be provided in the present invention is between 6 to 30 inclusive. If five or less projections 11 are provided, the gaps (i.e. the notches 41) between the projections 11 become too wide. In this case, the effect of the present invention cannot be satisfactorily achieved since the weft yarn 9 will easily slip out of the gaps. On the other hand, if 31 or more projections 11 are provided, the gaps between the projections 11 become too narrow.
  • the effect of the present invention cannot be satisfactorily achieved because, with weft yarns used for weft insertion in current fluid jet looms, the narrow gaps will make it difficult for a weft yarn 9 to be hooked thereon.
  • the number of projections 11 can be changed to a certain extent depending on, for example, the type of weft used or the size of the thread guide 3.
  • the outer periphery surface 42 and the inner periphery surface 43 connected to the sides 16 of each projection 11 provide a fixed wall thickness therebetween from the base end 15 to the apex 17 in this example, the wall thickness may decrease towards the tip of the projection 11 to prevent air flow disturbance.
  • an angle ⁇ formed between the opposing sides 16 of each adjacent pair of projections 11 is determined on the basis of the type of weft yarn 9 used, the dimensions (r1, t1) of the end portion 10, and the above conditions (1) to (3), the angle ⁇ is generally set lower than or equal to 90°, and is preferably an acute angle of 45° or lower.
  • Fig. 4 is a development view showing the structure of the projections 11 as viewed along line A-A' in Fig. 3 .
  • Figs. 5 to 8 illustrate modified examples of the structure of the projections 11.
  • Fig. 6 shows an example that simply differs from that in Fig.
  • each projection 11 is defined by a V-shaped notch (i.e. the base surface is linear).
  • a returning weft yarn 9 can be nipped and held in at least one of the V-shaped notches, thereby further preventing the weft yarn 9 from falling out of the nozzle.
  • Fig. 7 shows an example where the projections 11 have a saw-tooth-like structure and have both the advantages of the structures shown in Figs. 5 and 6 .
  • Fig. 8 is an example where the projections 11 are sharp and are separated from each other by U-shaped notches arranged at a certain pitch.
  • Figs. 9A to 9C illustrate other examples of the present invention for fitting a tubular component to the end portion 10 of the thread guide 3.
  • Fig. 9A shows an example where the end portion 10 of the thread guide 3 is given a straight tubular structure in which the tubular component 51a is fitted, instead of being given an inner stepped structure.
  • the end surface of the tubular component 51a facing upstream in the weft-insertion direction is preferably beveled.
  • Fig. 9B shows an example where the apexes 17 of the projections 11 provided at one end of the tubular component 51a are located upstream in the weft-insertion direction relative to the downstream end surface 52 of the thread guide 3.
  • the externally-disposed component of the two-tiered structure (the thread guide 3 in this example) completely covers the projections 11 from the outside, such that the projections 11 (notches 41) are not exposed to the orifice flow channel 40. This can completely prevent air from escaping into the weft guiding path 5 through the notches 41, whereby a stable air flow can be created in the weft-insertion direction.
  • An offset amount t3 of the apexes 17 with respect to the downstream end surface 52 is several millimeters, and is preferably between 0.1 and 5.0 mm inclusive. It is expected that a similar advantage can be achieved by positioning the apexes 17 and the downstream end surface 52 on the same plane without displacing them from each other by an offset amount.
  • Fig. 9C shows an example where a tubular component 51e is fitted around the end portion 10 of the thread guide 3, such that the end portion 10 of the thread guide 3 is given a two-tiered structure in the radial direction thereof.
  • the projections 11 are provided at the downstream end of the thread guide 3 serving as the internally-disposed component of the two-tiered structure.
  • the end portion 10 of the thread guide 3 has an outer step section 56e that defines a thin-walled section.
  • the tubular component 51e is given an inside diameter that allows the tubular component 51e to be engageable to the outer step section 56e.
  • the tubular component 51e preferably has an outside diameter that is substantially equal to the outside diameter of the thread guide 3 immediately upstream of the outer step section 56e, so that the tubular component 51e can substantially serve as the end portion 10 of the thread guide 3.
  • the tubular component 51e is disposed around the thread guide 3 such that the base end 15 of each projection 11 is positioned upstream relative the downstream end surface 52 of the tubular component 51e.
  • 9B can be achieved by positioning the apexes 17 of the projections 11 provided at one end of the thread guide 3 upstream relative to the downstream end surface 52 of the tubular component 51e in the weft-insertion direction or by positioning the apexes 17 of the projections 11 and the downstream end surface 52 of the tubular component 51e on the same plane.
  • the tubular component 51a or the tubular component 51e can be joined to the end portion 10 of the thread guide 3 by means of, for example, press-fitting, adhering, or screwing.
  • the tubular component 51a may be given a male screw portion and the end portion 10 of the thread guide 3 may be given a female screw portion so that the relative position between the tubular component 51a and the end portion 10 of the thread guide 3 can be made adjustable in the axial direction. In this manner, the axial position of the projections 11 can be adjusted in accordance with the yarn type or yarn shape.
  • tubular components 51b, 51c, and 51d are fitted within the thread guide 3. Downstream ends of the tubular components 51b, 51c, and 51d in the weft-insertion direction (namely, cylindrical sections 55b, 55c, and 55d) are each provided with a plurality of projections 11 arranged in the circumferential direction.
  • Fig. 10 shows an example where the three types of tubular components are all attached to the thread guide 3, an alternative example is permissible where any one of the tubular components or a combination of two or more tubular components is attached to the thread guide 3.
  • the tubular components are attached to arbitrary positions within an area where the weft guiding path 5 is provided.
  • the number of projections 11, the pitch P of the projections 11, the length a of each projection 11 at the apex 17 in the circumferential direction, and the height H (distance between the apex 17 and the base end 15) of each projection 11 are set to values most suitable for hooking a weft yarn 9 on the basis of the inside radius r1 and the wall thickness t1 of each tubular component 51b, 51c, 51d, and the thickness of the weft yarn used.
  • a tubular component 51b according to a first embodiment is fitted within the weft guiding path 5 of the thread guide 3 in an area where the small-diameter section 7 of the thread guide 3 is provided.
  • the tubular component 51b has a cylindrical shape having a conical hole whose upstream side in the weft-insertion direction has a larger diameter, a through hole 50b located downstream of the conical hole and having a fixed inside diameter in the axial direction, and a cylindrical section 55b having a fixed outside diameter over the entire length in the axial direction.
  • the weft guiding path 5 in the area of the thread guide 3 where the small-diameter section 7 is provided has an inner periphery surface having a fixed inside diameter D2 in the axial direction, and a stepped section 56b continuing from the inner periphery surface and having a base surface 54b that faces the entrance side.
  • the weft guiding path 5 downstream of the stepped section 56b has a substantially fixed inside diameter D1 which is smaller than the inside diameter D2.
  • the tubular component 51b is positioned in the axial direction by having its downstream end surface (i.e. the apexes 17 of the projections 11) disposed in abutment with the base surface 54b.
  • the tubular component 51b has a substantially cylindrical shape with an outside diameter that allows the tubular component 51b to be fitted in the inner periphery surface of the stepped section 56b having the inside diameter D2.
  • the tubular component 51b also has the through hole 50b having an inside diameter d1 which is smaller than the inside diameter D1 of the weft guiding path 5.
  • the tubular component 51b has a tapered surface provided for guiding a weft yarn 9. The diameter of this tapered surface decreases gradually in the downstream direction from the entrance of the tubular component 51b until reaching the inside diameter d1. An end of the tapered surface continuously connects to the inner periphery surface (weft guiding path 5) having the inside diameter d1.
  • the tubular component 51b is provided with a plurality of projections 11 arranged in the circumferential direction and tapered from the base ends 15 toward the tips thereof.
  • the inner periphery surface of the through hole 50b and the tapered surface in the tubular component 51b communicate with the weft guiding path 5 of the thread guide 3 and substantially serve as the weft guiding path 5 in a part of the small-diameter section 7 of the thread guide 3.
  • the apexes of the projections 11 at the end of the tubular component 51b are exposed to the weft guiding path 5 in an area of the weft guiding path 5 having a smaller diameter than the inside diameter D1.
  • a weft yarn 9 can be caught in at least one of the notches between the adjacent projections 11.
  • a tubular component 51c according to a second embodiment is fitted within the weft guiding path 5 of the thread guide 3 in an area where the large-diameter section 6 is provided.
  • the tubular component 51c has a cylindrical shape having a conical hole whose upstream side in the weft-insertion direction has a larger diameter and which tapers downstream to an inside diameter d2, a through hole 50c located downstream of the conical hole and having a fixed inside diameter d2 in the axial direction, a cylindrical section 55c having a fixed outside diameter and having a plurality of projections 11 arranged in the circumferential direction and tapered from the base ends 15 toward the tips thereof, and a flange 57c located upstream of the cylindrical section 55c and having a diameter larger than that of the cylindrical section 55c.
  • the flange 57c is connected to the cylindrical section 55c.
  • the weft guiding path 5 in the area of the thread guide 3 where the large-diameter section 6 is provided has a base surface 54c extending outward in the radial direction, and a stepped section 56c located upstream of the base surface 54c and having a fixed inside diameter from the entrance of the weft guiding path 5.
  • the weft guiding path 5 tapers gradually downstream from the area with the base surface 54c and extends through an area with an inside diameter D2'.
  • the flange 57c of the tubular component 51c is positioned in the axial direction by having its downstream end surface disposed in abutment with the base surface 54c.
  • the through hole 50c of the tubular component 51c has an inner periphery surface that communicates with the weft guiding path 5 of the thread guide 3 and substantially serves as the weft guiding path 5 in a part of the large-diameter section 6 of the thread guide 3.
  • the cylindrical section 55c extending downstream from the flange 57c has a fixed outside diameter and a fixed inside diameter d2 in the downstream direction that are smaller than the inside diameter D2' of the weft guiding path 5.
  • One end of the cylindrical section 55c is provided with a plurality of projections 11 arranged in the circumferential direction and tapered from the base ends 15 toward the tips thereof. Therefore, in view of the inside-diameter relationship, the plurality of projections 11, namely, the notches 41 formed between the adjacent projections 11, are disposed so as to be entirely exposed to the weft guiding path 5 in the circumferential direction, whereby a weft yarn 9 can be caught in at least one of the notches 41 between the projections 11 at the time of a weft cutting process.
  • a tubular component 51d according to a third embodiment is fitted in an upstream opening of the weft guiding path 5 of the thread guide 3.
  • the tubular component 51d not only has a function for preventing a weft yarn from falling out of the nozzle, but also functions as a yarn guide 14 for guiding a weft yarn towards the center of the weft guiding path 5.
  • the tubular component 51d has a fixed inside diameter in the axial direction.
  • the tubular component 51d has a through hole 50d whose upstream opening has a rounded rim, a cylindrical section 55d having an outside diameter that allows the cylindrical section 55d to be fitted within an inner periphery surface of the thread guide 3 having an inside diameter D3, and a flange 57d located upstream of the cylindrical section 55d and connected to the cylindrical section 55d.
  • the cylindrical section 55d has a plurality of projections 11 arranged in the circumferential direction and tapered from the base ends 15 toward the tips thereof in the downstream direction.
  • an upstream end of the weft guiding path 5 of the thread guide 3 is provided with a stepped section having a base surface 54d that extends outward in the radial direction.
  • the tubular component 51d is positioned in the axial direction by having the downstream-facing surface of the flange 57d in abutment with the base surface 54d.
  • the through hole 50d of the tubular component 51d has an inner periphery surface with a fixed inside diameter d3 and communicates with the weft guiding path 5 of the thread guide 3.
  • the through hole 50d substantially serves as the weft guiding path 5 at the opening of the large-diameter section 6 of the thread guide 3.
  • the cylindrical section 55d of the tubular component 51d has an outside diameter that is smaller than the inside diameter D3 of the weft guiding path 5. Since the plurality of projections 11, namely, the notches 41 formed between the adjacent projections 11, are entirely exposed to the weft guiding path 5 in the circumferential direction, a weft yarn 9 can be caught in at least one of the notches 41 between the projections 11 at the time of a weft cutting process.
  • the inside diameters D1, D2', and D3 of the weft guiding path 5 immediately downstream of the areas where the tubular components 51b, 51c, and 51d are disposed are set larger than the inside diameters d1, d2, and d3 of the through holes 50b, 50c, and 50d in the tubular components 51b, 51c, and 51d, respectively.
  • the present invention is not limited to a main nozzle that is integrally attached to a sley and that discharges a weft yarn into a warp shed, such as a weft insertion nozzle in an air jet loom.
  • the present invention is applicable to a subsidiary main nozzle that is located further upstream and that adds momentum to a weft yarn in the downstream direction.
  • the present invention is also applicable to a weft insertion nozzle in a water jet loom.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (7)

  1. Buse d'insertion de fil de trame (1) pour un métier à tisser du type à jet de fluide, la buse d'insertion de fil de trame (1) englobant un corps de buse (2) possédant un trou d'insertion (4) et englobant également un guide fil (3) inséré dans le trou d'insertion (4), le guide fil (3) possédant une voie de guidage pour fil de trame (5) s'étendant à travers lui, une extrémité du guide fil (3) étant insérée dans le trou d'insertion (4) et une section d'aiguille (8) du guide fil étant disposée en aval de ladite extrémité dans la direction d'insertion du fil de trame, la section d'aiguille (8) possédant un diamètre externe qui diminue dans la direction aval, la buse d'insertion de fil de trame (1) alimentant en fluide comprimé un espace ménagé entre la section d'aiguille (8) du guide fil (3) et le trou d'insertion (4) du corps de buse (2) de façon à éjecter un fil de trame (9) s'étendant à travers la voie de guidage pour fil de trame (5), caractérisée en ce qu'un composant tubulaire (51a, 51 b, 51c, 51d, 51e) possédant un trou de passage (50a, 50b, 50c, 50d, 50e) et une section cylindrique (55a, 55b, 55c, 55d, 55e) vient se disposer à l'intérieur ou autour du guide fil (3), la section cylindrique (55a, 55b, 55c, 55d, 55e) possédant au moins une configuration tubulaire à une extrémité dans sa direction axiale, et dans laquelle la surface périphérique interne, d'un élément choisi parmi le composant tubulaire (51a, 51 b, 51c, 51d, 51e) et le guide fil (3) fait essentiellement office de voie de guidage du fil de trame (5) dans une zone dans laquelle est disposé le composant tubulaire (51a, 51 b, 51c, 51 d, 51e), ledit élément choisi parmi le composant tubulaire (51a, 51 b, 51c, 51d, 51e) et le guide fil (3) possédant une extrémité aval dans la direction d'insertion du fil de trame qui est munie de plusieurs saillies (11) arrangées en direction circonférentielle, chaque saillie (11) manifestant un rétrécissement depuis son extrémité de base (15) jusqu'à sa pointe.
  2. Buse d'insertion de fil de trame (1) selon la revendication 1, dans laquelle le composant tubulaire (51a, 51e) vient s'insérer à l'intérieur ou autour d'une portion terminale (10) du fil guide (3) afin d'obtenir une structure à deux niveaux dans sa direction radiale, et dans laquelle l'extrémité aval choisie parmi celle dudit composant tubulaire (51a, 51e), et celle dudit fil guide (3) munie de plusieurs saillies (11) arrangées dans la direction circonférentielle comprend la portion terminale (10) d'un desdits éléments choisi parmi le fil guide (3) et le composant tubulaire (51 a, 51 e) qui est disposée du côté interne de la structure à deux niveaux.
  3. Buse d'insertion de fil de trame (1) selon la revendication 2, dans laquelle l'autre portion terminale (10) choisie parmi celle du fil guide (3) et celle du composant tubulaire (51a, 51e), qui est disposée sur le côté externe de la structure à deux niveaux, possède une surface terminale aval (52) dans la direction d'insertion du fil de trame, et dans laquelle l'extrémité de base (15) de chaque saillie (11) vient se disposer en amont par rapport à la surface terminale aval (52).
  4. Buse d'insertion de fil de trame (1) selon l'une quelconque des revendications 2 et 3, dans laquelle la portion terminale (10) du guide fil (3) possède une section à gradin (56a, 56e) qui fait office de section à paroi mince, et dans laquelle le composant tubulaire (51 a, 51e) vient se disposer contre la section à gradin (56a, 56e).
  5. Buse d'insertion de fil de trame (1) selon la revendication 1, dans laquelle le composant tubulaire (51 b, 51 c, 51d) vient s'insérer au sein du guide fil (3), et dans laquelle l'extrémité aval dudit composant tubulaire (51b, 51 c, 51 d) est munie de plusieurs saillies (11) arrangées en direction circonférentielle.
  6. Buse d'insertion de fil de trame (1) selon l'une quelconque des revendications 2 et 5, dans laquelle le composant tubulaire (51a, 51 b, 51 c, 51d) possède une configuration cylindrique de telle sorte que son trou de passage (50a, 50b, 50c, 50d) possède un diamètre interne fixe et de telle sorte que le composant tubulaire (51a, 51b, 51 c, 51d) possède un diamètre externe fixe sur toute sa longueur dans la direction axiale, et dans laquelle le composant tubulaire (51a, 51 b, 51 c, 51 d) est disposé au sein du guide fil (3).
  7. Buse d'insertion de fil de trame (1) selon la revendication 5, dans laquelle le composant tubulaire (51 c, 51 d) est muni d'une bride (57c, 57d) qui est disposée en amont de la section cylindrique (55c, 55d) dans la direction d'insertion du fil de trame et qui est reliée à la section cylindrique (55c, 55d), dans laquelle la voie de guidage pour fil de trame (5) du guide fil (3), est munie d'une surface de base (54c, 54d) s'étendant vers l'extérieur en direction radiale, et dans laquelle le composant tubulaire (51c, 51d) vient se disposer de telle sorte que la surface de la bride (57c, 57d), orientée vers l'aval, vient buter contre la surface de base (54c, 54d).
EP20080010745 2007-06-27 2008-06-12 Dispositif d'insertion du fil de trame Not-in-force EP2014808B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007169149A JP2009007694A (ja) 2007-06-27 2007-06-27 緯入れノズルおよび緯入れノズルに用いられる緯糸のノズル抜け防止部材

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EP2014808A2 EP2014808A2 (fr) 2009-01-14
EP2014808A3 EP2014808A3 (fr) 2009-12-30
EP2014808B1 true EP2014808B1 (fr) 2011-04-13

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ITMI20090336A1 (it) 2009-03-06 2010-09-07 Promatech Spa Ugello di lancio con mezzi di ritegno di trama per un telaio tessile ad aria.
JP6024536B2 (ja) * 2013-03-15 2016-11-16 株式会社豊田自動織機 エアジェット織機のメインノズル
CN104389089B (zh) * 2014-10-30 2016-04-06 东华大学 用于生产弹力牛仔布的喷气织机主喷嘴结构及其引纬方法
JP6137133B2 (ja) * 2014-11-18 2017-05-31 株式会社豊田自動織機 エアジェット織機のメインノズル
CN112553752B (zh) * 2020-12-17 2022-04-26 苏州新东南纺织科技有限公司 一种喷气织机喷嘴

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JPS51124159U (fr) * 1975-03-20 1976-10-07
ATE2853T1 (de) * 1979-08-08 1983-04-15 Gebrueder Sulzer Aktiengesellschaft Duesenanordnung fuer eine webmaschine mit strahleintrag.
JPS5752579U (fr) * 1980-09-10 1982-03-26
DE19511439C1 (de) * 1995-03-29 1996-03-14 Dornier Gmbh Lindauer Verfahren zur Leistungssteigerung beim Schußfadeneintrag in ein Webfach einer Luftdüsenwebmaschine und Eintragsdüse zur Durchführung des Verfahrens
JP4057124B2 (ja) * 1998-01-20 2008-03-05 株式会社豊田自動織機 ジェットルームにおける緯糸把持装置
JP2003049342A (ja) * 2001-08-01 2003-02-21 Tsudakoma Corp 流体噴射式織機の緯入ノズル
JP2004270080A (ja) * 2003-03-10 2004-09-30 Toyota Industries Corp ジェットルームにおける糸抜け防止装置

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CN101358405B (zh) 2011-04-27
EP2014808A2 (fr) 2009-01-14
EP2014808A3 (fr) 2009-12-30
JP2009007694A (ja) 2009-01-15
CN101358405A (zh) 2009-02-04
DE602008006131D1 (de) 2011-05-26

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