EP3268524A1 - Auxiliary nozzle for a weaving machine - Google Patents
Auxiliary nozzle for a weaving machineInfo
- Publication number
- EP3268524A1 EP3268524A1 EP16707792.4A EP16707792A EP3268524A1 EP 3268524 A1 EP3268524 A1 EP 3268524A1 EP 16707792 A EP16707792 A EP 16707792A EP 3268524 A1 EP3268524 A1 EP 3268524A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- elementary
- hollow needle
- apertures
- elementary apertures
- auxiliary 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.)
- Granted
Links
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 an auxiliary nozzle for supporting a weft thread in a weaving machine, which auxiliary nozzle comprises a hollow needle, wherein the hollow needle comprises a tip and an outflow opening for an air jet, wherein the outflow opening is provided in a side wall adjoining the tip and is arranged to direct the air jet to a weft insertion channel when the auxiliary nozzle is mounted on the weaving machine.
- the invention also relates to a method for manufacturing an auxiliary nozzle and to a weaving machine provided with at least one auxiliary nozzle.
- Auxiliary nozzles also referred to as relay nozzles, are intended to support a weft thread during insertion of the weft thread into the shed of a weaving machine.
- auxiliary nozzles is arranged distributed across the width of the weft insertion channel of the reed of the weaving machine.
- Auxiliary nozzles are disclosed for example in US 3,978,896, wherein the outflow opening is composed of a plurality of elementary apertures arranged close to each other.
- CH 656 905 A5 discloses an auxiliary nozzle, wherein a plurality of tubular elements connected to each other at their outer surfaces, are arranged in the outflow opening for forming small channels.
- the tubular elements have a circular or a hexagonal cross-section.
- auxiliary nozzle having a plurality of elementary apertures, which auxiliary nozzle allows for an increased mass flow rate. It is further an object of the invention to provide a method for manufacturing such an auxiliary nozzle. [0007] This object is solved by the auxiliary nozzle with the features of claim 1 , the weaving machine with the features of claim 8, and the method with the features of claim 9.
- an auxiliary nozzle for supporting a weft thread in a weaving machine comprises a hollow needle, wherein the hollow needle comprises a tip, an outflow opening for an air jet and a side wall, wherein the outflow opening is provided in the side wall of the hollow needle adjoining the tip and is arranged to direct the air jet to a weft insertion channel when the auxiliary nozzle is mounted on the weaving machine, and wherein the outflow opening is composed of a plurality of elementary apertures having straight lateral surfaces, which elementary apertures are formed in the side wall of the hollow needle by laser cutting and are arranged close to each other in a tessellation pattern for maximizing the total flow-through section of the outflow opening.
- Adjacent elementary apertures are separated by partitions.
- the straight lateral surfaces allow for an arrangement of the elementary apertures close to one another and allow to minimize the surface area occupied by the partitions between the elementary apertures.
- the total flow-through section of the outflow opening is increased for a determined enveloping circumference of the outflow opening.
- Forming such elementary apertures is possible by applying a laser cutting technology.
- the laser cutting is done by melting, blowing and/or burning.
- use can be made of a low power laser with compressed air as amplifier or use can be made of a high power laser.
- the tessellation pattern in one embodiment is composed of square or triangular elementary apertures.
- elementary apertures having different cross- sectional shapes are combined for forming a tessellation pattern for the outflow opening.
- the shape of the cross-section of the elementary apertures is chosen suitably by the person skilled in the art.
- the size and shape of each elementary aperture is chosen in order to allow dust to pass through the elementary aperture and to avoid clogging of the elementary apertures.
- the tessellation pattern is a hexagonal tessellation pattern, wherein the elementary apertures have an at least substantially hexagonal cross- section.
- the cross-sections fulfill the so-called Conway criterion, this means the hexagonal cross-section has at least one pair of opposite lateral surfaces that are parallel and congruent.
- all elementary apertures have an at least substantially hexagonal cross-section.
- elementary apertures arranged at a boundary of the outflow opening have a different shape.
- elementary apertures having a regular hexagonal cross-section with six equal lateral surfaces, six equal angles and six equal corners are provided.
- the elementary apertures have a modified regular hexagonal cross-section with six equal lateral surfaces, six equal angles and six equal rounded corners.
- Using elementary apertures having such a modified regular hexagonal cross-section with six equal lateral surfaces, six equal angles and six equal rounded corners allows to provide a hexagonal tiling and, hence, a division of the outflow opening into regions of equal flow-through section, wherein the total flow-through section of all elementary apertures together is maximized with an enveloping circumference of the outflow opening as small as possible.
- the modified regular hexagonal cross-section having rounded corners instead of sharp corners is advantageous for avoiding turbulent air flows through the elementary apertures.
- the elementary apertures are formed in the side wall of the hollow needle.
- a flow-through section of the elementary apertures is constant over the thickness of the side wall.
- the flow-through section of each of the elementary apertures increases from an inner side of the needle to an outer side of the needle. This embodiment is particular suitable for forming such an outflow opening using laser cutting.
- the enveloping shape of the outflow opening composed of a plurality of elementary apertures is chosen suitably by the person skilled in the art to direct the air flow of the auxiliary nozzles towards the weft thread and to support the weft thread during its insertion into the shed.
- the elementary apertures are arranged in several stacked rows in the longitudinal direction of the hollow needle, wherein each row comprising at least one elementary aperture and wherein in a row closest to the tip of the hollow needle the at least one elementary aperture is oriented with one of its lateral surfaces facing towards the tip of the hollow needle.
- this row closest to the tip comprises only one single elementary aperture.
- the enveloping shape of the outflow opening composed of a plurality of elementary apertures at least approximates the shape of a regular hexagon. This arrangement allows ejecting an air jet, which is similar to an air jet ejected by an outflow opening having one single elliptical opening.
- the elementary apertures are provided to abut lateral surface to lateral surface in a plurality of lines, preferably three lines or four lines, arranged at an angle between about 30° and about 60° with respect to the longitudinal axis of the hollow needle so that all elementary apertures cross a lower warp plane earlier than when arranged in mirror symmetry to the longitudinal axis.
- a weaving machine which weaving machine has at least one auxiliary nozzle as described above.
- the weaving machine is provided with a plurality of auxiliary nozzles arranged distributed across the width of the weft insertion channel of the reed of the weaving machine.
- a method for manufacturing an auxiliary nozzle for supporting a weft thread in a weaving machine comprises a hollow needle, wherein the hollow needle comprises a tip and an outflow opening for an air jet, and wherein the outflow opening is provided in a side wall of the hollow needle adjoining the tip and is arranged to direct the air jet to a weft insertion channel when the auxiliary nozzle is mounted on the weaving machine, the method comprises the step of laser cutting using a laser cutting device of a plurality of elementary apertures having straight lateral surfaces in a tessellation pattern into the side wall of the hollow needle for forming an outflow opening composed of a plurality of elementary apertures arranged close to each other.
- a plurality of elementary apertures are cut using the laser cutting device in a hexagonal tessellation pattern into the side wall, wherein the elementary apertures have an at least substantially hexagonal cross-section.
- elementary apertures having congruent hexagonal cross-sections with at least one pair of opposite lateral surfaces, that are parallel and congruent are provided.
- a plurality of elementary apertures is cut using the laser cutting device into the side wall, which elementary apertures each have a modified regular hexagonal cross-section with six equal lateral surfaces, six equal angles and six equal rounded corners.
- the elementary apertures are cut using a laser cutting device into the side wall from an outer side of the hollow needle, so that a flow-through section of each of the elementary apertures decreases from an outer side of the hollow needle to an inner side of the hollow needle.
- elementary apertures are provided that diverge from an inner side of the hollow needle to an outer side of the hollow needle allowing an air flow through the elementary aperture to expand. This is favorable for obtaining air flows having a high velocity.
- the arrangement of the elementary apertures in the tessellation pattern is chosen suitably by the person skilled in the art.
- the elementary apertures are cut into the side wall using the laser cutting device so that the tessellation pattern comprises several stacked rows, wherein each row comprises at least one elementary aperture and wherein in a row closest to the tip of the hollow needle the at least one elementary aperture is oriented with one of its lateral surfaces facing towards the tip of the hollow needle.
- Preferably only one single elementary aperture is provided in the row closest to the tip of the hollow needle.
- the enveloping shape of the outflow opening follows the side wall of the hollow needle.
- the elementary apertures are cut into the side wall using the laser cutting device so that the shape of the outflow opening composed of a plurality of elementary apertures at least approximates the shape of a regular hexagon.
- the elementary apertures are cut into the side wall using the laser cutting device to abut lateral surface to lateral surface in a plurality of lines, preferably three lines or four lines, arranged at an angle between about 30° and about 60° with respect to the longitudinal axis of the hollow needle so that all elementary apertures cross a lower warp plane earlier than when arranged in mirror symmetry to the longitudinal axis.
- Figure 1 shows in a schematic view a part of a weaving machine with a plurality of auxiliary nozzles, in particular a part of an air jet weaving machine.
- Figure 2 shows an auxiliary nozzle mounted on a holder to be provided on a sley of the air jet weaving machine of Figure 1.
- Figure 3 is a front view of a hollow needle of the auxiliary nozzle of Figure 2.
- Figure 4 is a cross-sectional view along plane IV-IV of Figure 3.
- Figure 5 is a cross-sectional view along plane V-V of Figure 3.
- Figure 6 is a top view of the hollow needle of Figure 3.
- Figure 7 is a cross-sectional view along plane VII-VII of Figure 3.
- Figure 8 is a detail at the height of one of the elementary apertures of Figure 3.
- Figure 9 is a front view of a hollow needle according to an alternative embodiment.
- Figure 10 is a cross-sectional view along plane X-X of Figure 9.
- Figure 1 1 is a front view of a hollow needle similar to Figure 9.
- Figure 12 is a cross-sectional view along plane XII-XII of Figure 1 1.
- Figure 13 is a schematic illustration of a method for manufacturing the auxiliary nozzle of Figure 2.
- the weaving machine shown in Figure 1 comprises a reed 3 consisting of a plurality of dents, each having a cross-section suitable to form a U-shaped weft insertion channel 4, also referred to as guiding channel.
- weft threads 1 , 2 are inserted into a shed formed between an upper plane of warp threads and a lower plane of warp threads (not shown the figures).
- the weft threads 1 or 2 are each blown into the weft insertion channel 4 by a main nozzle 5, 6.
- the further transportation of the weft threads 1 or 2 through the weft insertion channel 4 is supported by air jets 7 which are blown into the weft insertion channel 4 by the auxiliary nozzles 8.
- a holder 9 is assigned to each auxiliary nozzle 8 for mounting the auxiliary nozzle 8 to a sley 10.
- the auxiliary nozzles 8 are evenly or at a variable distance arranged distributed across the width of the weft insertion channel 4 of the reed 3.
- the reed 3 and the main nozzles 5, 6 are also mounted to the sley 10.
- Figure 2 shows an embodiment of an auxiliary nozzle 8 and an associated holder 9.
- the holder 9 is to be mounted on the sley 10 (shown in Figure 1 ).
- the auxiliary nozzle 8 comprises a hollow needle 1 1 with a tip 12, an outflow opening 13 for an air jet 7 (shown in Figure 1 ) and a side wall 14, which outflow opening 13 is provided in the side wall 14 adjoining the tip 12.
- the outflow opening 13 is composed of a plurality of elementary apertures 15 arranged close to each other in the side wall 14.
- the auxiliary nozzle 8 further comprises a connecting socket 16 for a connection to a supply of compressed air (not shown).
- FIG. 1 The hollow needle 1 1 of Figure 2 is shown in more detail in Figures 3 to 7, in a front view, two cross-sectional views, a top view and another cross-sectional view, respectively.
- Figure 8 is a detail at the height of one of the elementary apertures 15 of Figure 3.
- the outflow opening 13 is composed of a plurality of elementary apertures 15 having straight lateral surfaces 17, which elementary apertures 15 are arranged in a tessellation pattern. More particular, in the embodiment shown in Figures 3 to 7, the tessellation pattern is a hexagonal tessellation pattern. As can best be seen in Figure 8, the elementary apertures 15 each have a modified regular hexagonal cross-section with six equal lateral surfaces 17, six equal angles a and six equal rounded corners 18. The rounded corners 18 are favorable for directing the air jet 7 (shown in Figure 1 ) and avoiding turbulences that may develop in the transition area of sharp corners.
- the elementary apertures 15 can be arranged close to each other and the surface occupied by the partitions 19 (indicated amongst others in Figure 8) between the elementary apertures 15 can be minimized. As a result thereof, the total flow-through section of the outflow opening 13 is increased without increasing the enveloping circumference of the outflow opening 13.
- the region of the side wall 14 at which the elementary apertures 15 forming the outflow opening 13 are provided is inclined with respect to the longitudinal axis 24 of the hollow needle 1 1 allowing for an improved directing of the air jet 7 (shown Figure 1 ) for supporting a weft thread 1 , 2.
- the hollow needle 1 1 shown in Figures 3 to 8 has an oval cross-sectional shape (shown in Figure 5) in order to be able to provide a wider side wall 14 without increasing the total volume of the hollow needle 1 1.
- the elementary apertures 15 forming the outflow opening 13 are cut into the side wall 14 adjacent to the tip 12 of the hollow needle 1 1 using a laser cutting technology.
- a flow-through section of each of the elementary apertures 15 decreases from an outer side 25 of the hollow needle 1 1 to an inner side 26 of the hollow needle 1 1 .
- the flow-through sections of the elementary apertures 15 diverge towards the outer side 25 so that compressed air flowing through the elementary apertures 15 will expand before finally being ejected. This expansion is advantageous for obtaining air jets 7 (shown in figure 1 ) having a high velocity.
- the elementary apertures 15 are arranged in a tessellation pattern having several, namely seven, stacked rows in the direction of the longitudinal axis 24 of the hollow needle 1 1 , wherein in a row of the tessellation pattern, which is located closest to the tip 12 of the hollow needle 1 1 only one single elementary aperture 15 is arranged.
- This elementary aperture 15 as well as all other elementary apertures 15 is oriented with one of its lateral surfaces 17 facing towards the tip 12 of the hollow needle 1 1 .
- FIG. 3 shows two alternative embodiments of hollow needles 1 1 for an auxiliary nozzle 8 of Figure 1 having an outflow opening 13 composed of a plurality of elementary apertures 15 with a modified regular hexagonal cross-section, which elementary apertures 15 are arranged close to each other in the side wall 14 of the hollow needle 1 1.
- the elementary apertures 15 are provided in a hexagonal tessellation pattern to abut lateral surface to lateral surface in a plurality of lines 20, namely four lines 20 in Figures 9 and 10 and three lines 20 in Figures 1 1 and 12.
- the lines 20 are arranged at an angle between about 30° and about 60° with respect to the longitudinal axis 24 of the hollow needle 1 1. Due to this arrangement, all elementary apertures 15 in use cross a lower warp plane 21 , indicated by lines in Figures 9 and 1 1 , earlier than when arranged in mirror symmetry to the longitudinal axis 24.
- Figure 13 schematically shows a method for manufacturing a hollow needle 1 1 having an outflow opening 13 composed of a plurality of elementary apertures 15 using a laser cutting device 22.
- a laser cutting device 22 With the laser cutting device 22 a plurality of elementary apertures 15 each having an at least substantially hexagonal cross-section is cut into the side wall 14, wherein the elementary apertures 15 are arranged in a hexagonal tessellation pattern with small partitions 19 between the elementary apertures 15, as shown in any one of the Figure 3, the Figure 9 or the Figure 1 1 .
- the laser cutting device 22 is arranged to direct a laser beam 23 towards the hollow needle 1 1 for cutting the elementary apertures 15 into the hollow needle 1 1 as schematically shown in Figure 13.
- the laser beam 23 is directed towards the outer side 25 of the hollow needle 1 1 .
- the elementary apertures 15 cut into the side wall 14 have larger dimensions at the outer side 25 of the hollow needle 1 1 than at the inner side 26 of the hollow needle 1 1 , in other words the elementary apertures 15 converge from the outer side 25 of the hollow needle 1 1 to the inner side 26 of the hollow needle 1 1 .
- the partitions 19 will form a surface at the height of the lateral surfaces of the elementary apertures 15 which is sufficient rough for increasing contact properties of the air flow along the lateral surfaces 17, which is sufficient rough for improving a directing of the air flow towards the outer side, and which is sufficient smooth for limiting a noticeable braking of the air flow at the surface of the lateral surfaces 17.
- the auxiliary nozzle and the method according to the invention are not limited to the embodiments described by way of example and shown in the drawings. Variants and combinations of the described and shown embodiments that fall under the claims are also possible.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2015/0101A BE1022812B1 (en) | 2015-03-11 | 2015-03-11 | AUXILIARY NOZZLE FOR A WEAVING MACHINE |
PCT/EP2016/054569 WO2016142273A1 (en) | 2015-03-11 | 2016-03-03 | Auxiliary nozzle for a weaving machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3268524A1 true EP3268524A1 (en) | 2018-01-17 |
EP3268524B1 EP3268524B1 (en) | 2019-12-18 |
Family
ID=53488069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16707792.4A Active EP3268524B1 (en) | 2015-03-11 | 2016-03-03 | Auxiliary nozzle for a weaving machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3268524B1 (en) |
CN (1) | CN107407019A (en) |
BE (1) | BE1022812B1 (en) |
WO (1) | WO2016142273A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3640382B1 (en) * | 2018-10-16 | 2021-07-07 | Tsudakoma Kogyo Kabushiki Kaisha | Sub-nozzle for air jet loom |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7406857A (en) * | 1974-05-21 | 1975-11-25 | Rueti Te Strake Bv | HOLLOW NEEDLE-SHAPED NOZZLE WITH A NOZZLE OPENED NEAR THE TIP, IN THE SIDEWALL. |
BE892832A (en) * | 1982-04-14 | 1982-10-14 | Picanol Nv | Auxiliary weft thread transport blower nozzle - has hollow needle with single blower orifice of specified geometry in wall near closed end |
CH656905A5 (en) * | 1982-11-30 | 1986-07-31 | Sulzer Ag | Blowing nozzle for pneumatic weaving machines |
DE3639867C1 (en) * | 1986-11-21 | 1987-10-29 | Picanol Nv | Jet-weaving machine |
JPH02205285A (en) * | 1989-01-31 | 1990-08-15 | Nissan Motor Co Ltd | Method for processing auxiliary nozzle injection hole for weft insertion of air jet type loom |
BE1012608A3 (en) * | 1999-04-14 | 2001-01-09 | Picanol Nv | Nozzle for a weaving machine. |
JP3916872B2 (en) * | 2001-01-11 | 2007-05-23 | 株式会社マキタ | Electric tool |
CN201256511Y (en) * | 2008-09-24 | 2009-06-10 | 北京北广科技股份有限公司 | Dustproof ventilation cover with little wind resistance and high ventilation area |
-
2015
- 2015-03-11 BE BE2015/0101A patent/BE1022812B1/en active
-
2016
- 2016-03-03 WO PCT/EP2016/054569 patent/WO2016142273A1/en active Application Filing
- 2016-03-03 CN CN201680014906.6A patent/CN107407019A/en active Pending
- 2016-03-03 EP EP16707792.4A patent/EP3268524B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3268524B1 (en) | 2019-12-18 |
BE1022812B1 (en) | 2016-09-13 |
CN107407019A (en) | 2017-11-28 |
WO2016142273A1 (en) | 2016-09-15 |
BE1022812A1 (en) | 2016-09-13 |
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