EP2610378A1 - Auxiliary nozzle of air jet loom - Google Patents
Auxiliary nozzle of air jet loom Download PDFInfo
- Publication number
- EP2610378A1 EP2610378A1 EP12194622.2A EP12194622A EP2610378A1 EP 2610378 A1 EP2610378 A1 EP 2610378A1 EP 12194622 A EP12194622 A EP 12194622A EP 2610378 A1 EP2610378 A1 EP 2610378A1
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- EP
- European Patent Office
- Prior art keywords
- nozzle
- axis
- auxiliary nozzle
- auxiliary
- center
- 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.)
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- 238000003780 insertion Methods 0.000 claims abstract description 32
- 230000037431 insertion Effects 0.000 claims abstract description 32
- 235000014676 Phragmites communis Nutrition 0.000 description 8
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Images
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
-
- 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
- D03D47/3026—Air supply systems
- D03D47/3053—Arrangements or lay out of air supply systems
Definitions
- the present invention relates to an auxiliary nozzle of an air jet loom.
- weft insertion is accomplished by an air jet injected by a main nozzle into a weft yarn guide passage provided in a shed of warp yarns and also by air jets injected by auxiliary nozzles for assisting the weft yarn in flying through the shed.
- the entry of the auxiliary nozzle into a shed of warp yarns should be minimized so as to reduce interference of the nozzles with the warp yarns as much as possible.
- Due to the structure of a weft insertion device in an air jet loom a predetermined distance is unavoidably required between the flying path of an inserted weft yarn and the entry position of the auxiliary nozzle in the shed of warp yarns. Therefore, a high directivity is required for the air jet that is injected from the auxiliary nozzle toward the flying path of the weft yarn.
- Japanese Patent Application Publication 8-60492 discloses an auxiliary nozzle that can be disposed parallel to warp yarns so as to restrict the diffusion of air injected from the auxiliary nozzle and also to reduce the interference with the warp yarns.
- the auxiliary nozzle of the above Publication is formed into a flattened hollow tube whose front wall and rear wall are disposed substantially parallel to each other when the auxiliary nozzle is mounted in place in the air jet loom.
- the auxiliary nozzle is formed by deep drawing process so as to taper toward the upper end thereof and close at the upper end.
- a nozzle hole is formed through the front wall of the auxiliary nozzle at a position adjacent to the upper end thereof.
- the center of the nozzle hole is offset from the center of the auxiliary nozzle in such a width direction thereof that the nozzle hole is located at a position that is adjacent to the reed of the loom when the auxiliary nozzle is fixed in place to the slay of the air jet loom.
- the nozzle hole is also formed so that the axis thereof is directed obliquely upward. That is, the nozzle hole is machined so that the axis thereof is directed upward and also in a direction toward the reed. Additionally, the nozzle hole is tapered at a constant rate outwardly in the air flowing direction through the hole.
- the auxiliary nozzle Due to the above-described structure of the auxiliary nozzle, compressed air in the nozzle hole is converged by the inner peripheral wall surface thereof, so that the diffusion of the air is prevented when the air is injected from the auxiliary nozzle. Additionally, though the flattened hollow tube of the auxiliary nozzle is disposed parallel to warp yarns, the nozzle hole is located on the side of the auxiliary nozzle adjacent to the reed and the axis of the nozzle hole is directed toward the reed side, so that air jet from the nozzle acts effectively on a weft yarn flying in the weft yarn flying path.
- auxiliary nozzle of the above Publication, attention is given only to the disposition of the nozzle hole adjacent to the weft yarn flying path, but the auxiliary nozzle has a problem in that the injection pressure of air injected from the nozzle hole is decreased.
- the auxiliary nozzle is formed into a flattened hollow tube and closed at the upper end and compressed air is supplied into the auxiliary nozzle from the lower end thereof.
- pressure loss occurs in the region adjacent to the inner wall of the tube, so that the pressure of compressed air flowing around the center of the tube becomes highest.
- the center of the nozzle hole i.e. the axis thereof, is offset from the center of the auxiliary nozzle in the width direction thereof. Therefore, most of the compressed air flowing adjacent to the center of the auxiliary nozzle in the width direction thereof and having the highest pressure is not introduced into the nozzle hole smoothly, but impinges on inner surface of the upper end of the auxiliary nozzle. The impinging air turns around, flows downward toward the nozzle hole along inner surface of the front wall and introduced into the nozzle hole.
- the compressed air flowing adjacent to the center of the auxiliary nozzle in the width and the thickness directions thereof incurs pressure loss due to the impingement on the inner surface of the upper end of the auxiliary nozzle and also the friction between the compressed air and the inner surface of the front wall.
- the air having its pressure reduced will be injected through the nozzle hole of the auxiliary nozzle.
- compressed air with a higher pressure needs to be supplied to the auxiliary nozzle.
- increasing the pressure of the compressed air merely increases power consumption of the air jet loom.
- the present invention is directed to providing an auxiliary nozzle of an air jet loom that can increase the injection pressure and improve the directivity of the air jet.
- a auxiliary nozzle of an air jet loom includes a nozzle hole formed through a front wall of the auxiliary nozzle and having an inner opening opening to inside of the auxiliary nozzle and an outer opening opening to outside of the auxiliary nozzle.
- An axis extending in longitudinal direction of the auxiliary nozzle through axial center of the auxiliary nozzle is defined as center axis.
- An axis intersecting with the center axis and extending in a direction perpendicular to the front wall is defined as weft insertion axis.
- An axis extending through center of the inner opening and center of the outer opening is defined as nozzle hole axis.
- the nozzle hole axis is angularly spaced horizontally from the weft insertion axis. Weft insertion is accomplished by compressed air injected from the nozzle hole.
- the center of the inner opening is positioned on the weft insertion axis.
- the air jet loom and a weft insertion device used for the air jet loom are generally designated by numerals 1 and 2 in FIG. 1 , respectively.
- the weft insertion device 2 includes a main nozzle 3, a tandem nozzle 4 provided upstream of the main nozzle 3 and a plurality of auxiliary nozzles 5 provided downstream of the main nozzle 3.
- the main nozzle 3 and the auxiliary nozzles 5 are fixedly mounted on a slay 6 (refer to FIG. 2 ) of the air jet loom 1 and swingable reciprocally back and forth of the air jet loom 1 together with the slay 6.
- the tandem nozzle 4 is fixed to a frame (not shown) of the air jet loom 1 or to a bracket (not shown) that is fixed to the floor (not shown).
- the weft insertion device 2 further includes a weft supply 7 and a weft measurement and storage device 9 that are both provided upstream of the tandem nozzle 4.
- the weft measurement and storage device 9 stores and measures a predetermined length of weft yarn 8 that is drawn out from the weft supply 7 and corresponds to the weaving width.
- a main valve 10 is connected to the main nozzle 3 through a tube 11 for controllably supplying compressed air to the main nozzle 3.
- a tandem valve 12 is connected to the tandem nozzle 4 through a tube 13 for controllably supplying compressed air to the tandem nozzle 4.
- the main valve 10 and the tandem valve 12 are connected to a common air tank 16 through tubes 14, 15, respectively.
- the air tank 16 is connected through a main regulator 17, a pressure gauge 18 and a filter 19 to a common air supply source (not shown) that is composed of, e.g., a compressor installed in a weaving mill.
- the air tank 16 stores therein compressed air that is supplied from the air supply source and adjusted to a set pressure by the main regulator 17.
- the auxiliary nozzles 5 are divided into a plurality of groups (only two groups being shown in FIG. 1 ) and the auxiliary nozzles 5 of each group are connected through a tube 21 to an auxiliary valve 20 (only two auxiliary valves 20 being shown in FIG. 1 ) which are fixed to the frame (not shown) of the air jet bom 1.
- the auxiliary valves 20 of the respective groups are connected to a common auxiliary air tank 23 through tubes 22.
- the auxiliary air tank 23 is connected through an auxiliary regulator 25 and tubes 24 to a tube 26 connecting the main regulator 17 and the pressure gauge 18.
- the auxiliary air tank 23 stores compressed air that is supplied from the air supply source (not shown) and adjusted to a set pressure by the auxiliary regulator 25.
- the auxiliary valves 20 are operable to open in a relay manner at controlled timings during the weft inserting operation of the loom for allowing the auxiliary nozzles 5 of the respective groups to inject air jets in a relay manner.
- the main valve 10, the tandem valve 12, the auxiliary valves 20 and the pressure gauge 18 are electrically connected to a control device 27 of the air jet loom 1 through wirings 28 through 32.
- the control device 27 transmits control signals to activate the main valve 10, the tandem valve 12 and the auxiliary valves 20 at a predetermined crank angle of the loom for weft insertion into a shed of warp yarns.
- the auxiliary nozzle 5 and a reed 33 are fixed to the slay 6.
- the reed 33 includes an upper frame 35, a lower frame 36 and a large number of dents 34 which are connected at opposite ends thereof to the upper frame 35 and the lower frame 36, respectively.
- the lower frame 36 is fixed to the slay 6.
- Each dent 34 has an upper jaw 37, a lower jaw 38 and a U-shaped weft guide opening formed between the upper jaw 37 and the lower jaw 38. A plurality of such weft guide openings cooperate to form a weft guide passage 39.
- each auxiliary nozzle 5 is fixed to the slay 6.
- an auxiliary nozzle holder 40 supporting the auxiliary nozzles 5 is fastened to the slay 6 by means of bolts 42 provided in a groove 41 of the slay 6 and nuts 43 (only one pair of bolt and nut being shown in the drawing).
- Each auxiliary nozzle 5 has formed therethrough a nozzle hole 45 at upper end 44 thereof and a tube 21 ( FIG. 1 ) is connected to the lower end 46 of the auxiliary nozzle 5.
- the auxiliary nozzle 5 includes a flattened hollow tube having the closed upper end 44, a front wall 47 and a rear wall 48 ( FIG. 4 ).
- the flattened hollow tube of the auxiliary nozzle 5 may be formed by deep drawing process.
- the auxiliary nozzle 5 has a width H ( FIGS. 3 and 4 ) and has formed therein a hollow space that serves as an air passage 49. With the auxiliary nozzle 5 fixed to the slay 6 as shown in FIG. 2 , the flat front wall 47 and the flat rear wall 48 are disposed parallel to warp yarns so as to reduce the interference between the auxiliary nozzle 5 and the warp yarns.
- the nozzle hole 45 is formed through the front wall 47 at a position adjacent to the upper end 44 of the auxiliary nozzle 5.
- the nozzle hole 45 may be formed by electrical discharge or mechanical machining process.
- the nozzle hole 45 is formed into a tapered passage that has a circular inner opening 50 opening to the air passage 49 and having a center 50A and a circular outer opening 51 opening to the outside of the auxiliary nozzle 5 and having a center 51A. Referring to FIGS.
- the axis extending in longitudinal direction of the auxiliary nozzle 5 at the axial center thereof in the width H and the thickness directions of the auxiliary nozzle 5 is indicated by X and referred to as the center axis
- the axis intersecting with the center axis X and extending in a direction that is perpendicular to the front wall 47 of the auxiliary nozzle 5 (or perpendicular to the longitudinal direction of the auxiliary nozzle 5) is indicated by Y and referred to as the weft insertion axis
- the axis extending through the center 50A of the inner opening 50 and the center 51A of the outer opening 51 is indicated by Z and referred to as the nozzle hole axis.
- the nozzle hole 45 is formed so that the center 50A of the inner opening 50 is positioned on the weft insertion axis Y (refer to FIGS. 4 and 5 ) and the nozzle hole axis Z is angularly spaced horizontally toward the reed 33 side at an angle of a degrees from the weft insertion axis Y, as shown in FIG. 4 . Therefore, the center 51A of the outer opening 51 is spaced away from the weft insertion axis Y in the width direction of the auxiliary nozzle 5. In other words, with the auxiliary nozzle 5 fixed to the slay 6 as shown in FIG.
- the center 51A of the outer opening 51 is spaced from the weft insertion axis Y toward the reed 33 side of the loom 1.
- air can be injected from the outer opening 51 toward the weft guide passage 39 formed by the weft guide openings of the respective dents 34.
- the nozzle hole 45 may be formed within a general permissible range of tolerance that permits the center 50A of the inner opening 50 to be positioned slightly away from the weft insertion axis Y
- the nozzle hole 45 is also formed so that the nozzle hole axis Z is angularly spaced vertically toward the upper end 44 of the auxiliary nozzle 5 at an angle of ß degrees from the weft insertion axis Y, as shown in FIG. 5 .
- the nozzle hole axis Z is directed toward the deep upper corner of the weft guide passage 39, as shown in FIG. 2 , so that the force due to air jet can be applied to the weft yarn 8 effectively for allowing the weft yarn 8 to fly through a shed efficiently.
- the nozzle hole 45 is also formed so that the area of the outer opening 51 is smaller than that of the inner opening 50.
- the nozzle hole 45 is tapered toward the outer opening 51 at a constant taper rate (refer to FIGS. 4 and 5 ). Air that flows out through the nozzle hole 45 is converged along the nozzle hole axis Z by the tapered inner peripheral wall surface 52, so that the injection directivity of air jet can be improved.
- FIG. 6 Various flowing directions of compressed air in the air passage 49 of the auxiliary nozzle 5 are schematically shown by dotted arrows in FIG. 6 .
- Compressed air supplied into the auxiliary nozzle 5 flows toward the upper end 44 of the auxiliary nozzle 5 in the air passage 49 with the highest pressure of compressed air maintained about the center axis X.
- the center 50A of the inner opening 50 lies on the weft insertion axis Y and, therefore, the center 50A is also projected on the center axis X in the front view of the auxiliary nozzle 5 as shown in FIG. 6 , with the result that most of the high-pressure compressed air can be introduced toward the nozzle hole 45.
- the compressed air introduced toward the nozzle hole 45 is converged along the nozzle hole axis Z by the tapered inner peripheral wall surface 52 and injected at high pressure from the outer opening 51 in the injection direction T indicated by bold arrow in FIG. 6 .
- Angularly spacing the injection direction T horizontally from the weft insertion axis Y at an angle of ⁇ and also vertically from the same axis Y at an angle of ⁇ as previously described can improve the directivity of the injection direction T of air jet toward a weft yarn 8 that has been inserted by the main nozzle 3 into the weft guide passage 39.
- the present invention is not limited to the preferred embodiment, but may be practiced in various ways as exemplified below.
- a auxiliary nozzle of an air jet loom includes a nozzle hole formed through a front wall of the auxiliary nozzle and having an inner opening opening to inside of the auxiliary nozzle and an outer opening opening to outside of the auxiliary nozzle.
- An axis extending in longitudinal direction of the auxiliary nozzle through axial center of the auxiliary nozzle is defined as center axis.
- An axis intersecting with the center axis and extending in a direction perpendicular to the front wall is defined as weft insertion axis.
- An axis extending through center of the inner opening and center of the outer opening is defined as nozzle hole axis.
- the nozzle hole axis is angularly spaced horizontally from the weft insertion axis. Weft insertion is accomplished by compressed air injected from the nozzle hole.
- the center of the inner opening is positioned on the weft insertion axis.
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- Textile Engineering (AREA)
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Abstract
Description
- The present invention relates to an auxiliary nozzle of an air jet loom.
- In an air jet loom, weft insertion is accomplished by an air jet injected by a main nozzle into a weft yarn guide passage provided in a shed of warp yarns and also by air jets injected by auxiliary nozzles for assisting the weft yarn in flying through the shed. The entry of the auxiliary nozzle into a shed of warp yarns should be minimized so as to reduce interference of the nozzles with the warp yarns as much as possible. Due to the structure of a weft insertion device in an air jet loom, a predetermined distance is unavoidably required between the flying path of an inserted weft yarn and the entry position of the auxiliary nozzle in the shed of warp yarns. Therefore, a high directivity is required for the air jet that is injected from the auxiliary nozzle toward the flying path of the weft yarn.
- Japanese Patent Application Publication
8-60492 - The auxiliary nozzle of the above Publication is formed into a flattened hollow tube whose front wall and rear wall are disposed substantially parallel to each other when the auxiliary nozzle is mounted in place in the air jet loom. The auxiliary nozzle is formed by deep drawing process so as to taper toward the upper end thereof and close at the upper end. A nozzle hole is formed through the front wall of the auxiliary nozzle at a position adjacent to the upper end thereof. The center of the nozzle hole is offset from the center of the auxiliary nozzle in such a width direction thereof that the nozzle hole is located at a position that is adjacent to the reed of the loom when the auxiliary nozzle is fixed in place to the slay of the air jet loom. The nozzle hole is also formed so that the axis thereof is directed obliquely upward. That is, the nozzle hole is machined so that the axis thereof is directed upward and also in a direction toward the reed. Additionally, the nozzle hole is tapered at a constant rate outwardly in the air flowing direction through the hole.
- Due to the above-described structure of the auxiliary nozzle, compressed air in the nozzle hole is converged by the inner peripheral wall surface thereof, so that the diffusion of the air is prevented when the air is injected from the auxiliary nozzle. Additionally, though the flattened hollow tube of the auxiliary nozzle is disposed parallel to warp yarns, the nozzle hole is located on the side of the auxiliary nozzle adjacent to the reed and the axis of the nozzle hole is directed toward the reed side, so that air jet from the nozzle acts effectively on a weft yarn flying in the weft yarn flying path.
- However, in the auxiliary nozzle of the above Publication, attention is given only to the disposition of the nozzle hole adjacent to the weft yarn flying path, but the auxiliary nozzle has a problem in that the injection pressure of air injected from the nozzle hole is decreased. The auxiliary nozzle is formed into a flattened hollow tube and closed at the upper end and compressed air is supplied into the auxiliary nozzle from the lower end thereof. Generally, in the flow of compressed air in such a hollow tube, pressure loss occurs in the region adjacent to the inner wall of the tube, so that the pressure of compressed air flowing around the center of the tube becomes highest.
- In the auxiliary nozzle of the above Publication, however, the center of the nozzle hole, i.e. the axis thereof, is offset from the center of the auxiliary nozzle in the width direction thereof. Therefore, most of the compressed air flowing adjacent to the center of the auxiliary nozzle in the width direction thereof and having the highest pressure is not introduced into the nozzle hole smoothly, but impinges on inner surface of the upper end of the auxiliary nozzle. The impinging air turns around, flows downward toward the nozzle hole along inner surface of the front wall and introduced into the nozzle hole. Therefore, the compressed air flowing adjacent to the center of the auxiliary nozzle in the width and the thickness directions thereof incurs pressure loss due to the impingement on the inner surface of the upper end of the auxiliary nozzle and also the friction between the compressed air and the inner surface of the front wall. Thus, the air having its pressure reduced will be injected through the nozzle hole of the auxiliary nozzle. In order to produce an air jet with the desired level of velocity to allow a weft yarn to be conveyed through a shed of warp yarns stably by the subsidiary nozzle of the above Publication, compressed air with a higher pressure needs to be supplied to the auxiliary nozzle. However, increasing the pressure of the compressed air merely increases power consumption of the air jet loom.
- The present invention is directed to providing an auxiliary nozzle of an air jet loom that can increase the injection pressure and improve the directivity of the air jet.
- A auxiliary nozzle of an air jet loom includes a nozzle hole formed through a front wall of the auxiliary nozzle and having an inner opening opening to inside of the auxiliary nozzle and an outer opening opening to outside of the auxiliary nozzle. An axis extending in longitudinal direction of the auxiliary nozzle through axial center of the auxiliary nozzle is defined as center axis. An axis intersecting with the center axis and extending in a direction perpendicular to the front wall is defined as weft insertion axis. An axis extending through center of the inner opening and center of the outer opening is defined as nozzle hole axis. The nozzle hole axis is angularly spaced horizontally from the weft insertion axis. Weft insertion is accomplished by compressed air injected from the nozzle hole. The center of the inner opening is positioned on the weft insertion axis.
- Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
- The features of the present invention that are believed to be novel are set forth with particularity in the appended claims. The invention together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
-
FIG. 1 is a schematic block diagram showing an air jet loom having an auxiliary nozzle according to a preferred embodiment of the present invention; -
FIG. 2 is a cross-sectional view showing a fixing structure for the auxiliary nozzle of the air jet loom ofFIG. 1 ; -
FIG. 3 is an enlarged fragmentary front view of the auxiliary nozzle ofFIG. 2 ; -
FIG. 4 is a cross-sectional view taken along the line A-A inFIG. 3 ; -
FIG. 5 is a fragmentary longitudinal cross-sectional view of the auxiliary nozzle ofFIG. 2 ; and -
FIG. 6 is an enlarged fragmentary schematic front view of the auxiliary nozzle ofFIG. 2 describing the flow of compressed air in the auxiliary nozzle. - The following will describe the auxiliary nozzle of an air jet loom according to the preferred embodiment of the present invention with reference to
FIGS. 1 through 6 . The air jet loom and a weft insertion device used for the air jet loom are generally designated bynumerals FIG. 1 , respectively. Theweft insertion device 2 includes amain nozzle 3, atandem nozzle 4 provided upstream of themain nozzle 3 and a plurality ofauxiliary nozzles 5 provided downstream of themain nozzle 3. Themain nozzle 3 and theauxiliary nozzles 5 are fixedly mounted on a slay 6 (refer toFIG. 2 ) of theair jet loom 1 and swingable reciprocally back and forth of theair jet loom 1 together with theslay 6. Thetandem nozzle 4 is fixed to a frame (not shown) of theair jet loom 1 or to a bracket (not shown) that is fixed to the floor (not shown). Theweft insertion device 2 further includes a weft supply 7 and a weft measurement andstorage device 9 that are both provided upstream of thetandem nozzle 4. Using a weft yarn stop pin (not shown), the weft measurement andstorage device 9 stores and measures a predetermined length ofweft yarn 8 that is drawn out from the weft supply 7 and corresponds to the weaving width. - A
main valve 10 is connected to themain nozzle 3 through a tube 11 for controllably supplying compressed air to themain nozzle 3. Similarly, atandem valve 12 is connected to thetandem nozzle 4 through atube 13 for controllably supplying compressed air to thetandem nozzle 4. Themain valve 10 and thetandem valve 12 are connected to acommon air tank 16 throughtubes 14, 15, respectively. Theair tank 16 is connected through amain regulator 17, apressure gauge 18 and afilter 19 to a common air supply source (not shown) that is composed of, e.g., a compressor installed in a weaving mill. Theair tank 16 stores therein compressed air that is supplied from the air supply source and adjusted to a set pressure by themain regulator 17. - The
auxiliary nozzles 5 are divided into a plurality of groups (only two groups being shown inFIG. 1 ) and theauxiliary nozzles 5 of each group are connected through atube 21 to an auxiliary valve 20 (only two auxiliary valves 20 being shown inFIG. 1 ) which are fixed to the frame (not shown) of theair jet bom 1. The auxiliary valves 20 of the respective groups are connected to a commonauxiliary air tank 23 throughtubes 22. Theauxiliary air tank 23 is connected through anauxiliary regulator 25 andtubes 24 to atube 26 connecting themain regulator 17 and thepressure gauge 18. Theauxiliary air tank 23 stores compressed air that is supplied from the air supply source (not shown) and adjusted to a set pressure by theauxiliary regulator 25. The auxiliary valves 20 are operable to open in a relay manner at controlled timings during the weft inserting operation of the loom for allowing theauxiliary nozzles 5 of the respective groups to inject air jets in a relay manner. - The
main valve 10, thetandem valve 12, the auxiliary valves 20 and thepressure gauge 18 are electrically connected to acontrol device 27 of theair jet loom 1 throughwirings 28 through 32. Thecontrol device 27 transmits control signals to activate themain valve 10, thetandem valve 12 and the auxiliary valves 20 at a predetermined crank angle of the loom for weft insertion into a shed of warp yarns. - Referring to
FIG. 2 , theauxiliary nozzle 5 and areed 33 are fixed to theslay 6. Thereed 33 includes anupper frame 35, alower frame 36 and a large number ofdents 34 which are connected at opposite ends thereof to theupper frame 35 and thelower frame 36, respectively. Thelower frame 36 is fixed to theslay 6. Eachdent 34 has anupper jaw 37, alower jaw 38 and a U-shaped weft guide opening formed between theupper jaw 37 and thelower jaw 38. A plurality of such weft guide openings cooperate to form aweft guide passage 39. Meanwhile, eachauxiliary nozzle 5 is fixed to theslay 6. Specifically, anauxiliary nozzle holder 40 supporting theauxiliary nozzles 5 is fastened to theslay 6 by means ofbolts 42 provided in agroove 41 of theslay 6 and nuts 43 (only one pair of bolt and nut being shown in the drawing). Eachauxiliary nozzle 5 has formed therethrough anozzle hole 45 atupper end 44 thereof and a tube 21 (FIG. 1 ) is connected to thelower end 46 of theauxiliary nozzle 5. - The following will describe the
auxiliary nozzle 5 in detail with reference toFIGS. 3 through 5 . Theauxiliary nozzle 5 includes a flattened hollow tube having the closedupper end 44, afront wall 47 and a rear wall 48 (FIG. 4 ). The flattened hollow tube of theauxiliary nozzle 5 may be formed by deep drawing process. Theauxiliary nozzle 5 has a width H (FIGS. 3 and4 ) and has formed therein a hollow space that serves as anair passage 49. With theauxiliary nozzle 5 fixed to theslay 6 as shown inFIG. 2 , the flatfront wall 47 and the flatrear wall 48 are disposed parallel to warp yarns so as to reduce the interference between theauxiliary nozzle 5 and the warp yarns. - The
nozzle hole 45 is formed through thefront wall 47 at a position adjacent to theupper end 44 of theauxiliary nozzle 5. Thenozzle hole 45 may be formed by electrical discharge or mechanical machining process. Thenozzle hole 45 is formed into a tapered passage that has a circularinner opening 50 opening to theair passage 49 and having acenter 50A and a circularouter opening 51 opening to the outside of theauxiliary nozzle 5 and having acenter 51A. Referring toFIGS. 3 and4 , the axis extending in longitudinal direction of theauxiliary nozzle 5 at the axial center thereof in the width H and the thickness directions of theauxiliary nozzle 5 is indicated by X and referred to as the center axis, the axis intersecting with the center axis X and extending in a direction that is perpendicular to thefront wall 47 of the auxiliary nozzle 5 (or perpendicular to the longitudinal direction of the auxiliary nozzle 5) is indicated by Y and referred to as the weft insertion axis and the axis extending through thecenter 50A of theinner opening 50 and thecenter 51A of theouter opening 51 is indicated by Z and referred to as the nozzle hole axis. - The
nozzle hole 45 is formed so that thecenter 50A of theinner opening 50 is positioned on the weft insertion axis Y (refer toFIGS. 4 and5 ) and the nozzle hole axis Z is angularly spaced horizontally toward thereed 33 side at an angle of a degrees from the weft insertion axis Y, as shown inFIG. 4 . Therefore, thecenter 51A of theouter opening 51 is spaced away from the weft insertion axis Y in the width direction of theauxiliary nozzle 5. In other words, with theauxiliary nozzle 5 fixed to theslay 6 as shown inFIG. 2 , thecenter 51A of theouter opening 51 is spaced from the weft insertion axis Y toward thereed 33 side of theloom 1. With thefront wall 47 and therear wall 48 of theauxiliary nozzle 5 disposed parallel to the warp yarns (not shown), air can be injected from theouter opening 51 toward theweft guide passage 39 formed by the weft guide openings of therespective dents 34. - It is to be noted that, according to the present invention, the
nozzle hole 45 may be formed within a general permissible range of tolerance that permits thecenter 50A of theinner opening 50 to be positioned slightly away from the weft insertion axis Y - The
nozzle hole 45 is also formed so that the nozzle hole axis Z is angularly spaced vertically toward theupper end 44 of theauxiliary nozzle 5 at an angle of ß degrees from the weft insertion axis Y, as shown inFIG. 5 . In other words, with theauxiliary nozzle 5 fixed to theslay 6, the nozzle hole axis Z is directed toward the deep upper corner of theweft guide passage 39, as shown inFIG. 2 , so that the force due to air jet can be applied to theweft yarn 8 effectively for allowing theweft yarn 8 to fly through a shed efficiently. - The
nozzle hole 45 is also formed so that the area of theouter opening 51 is smaller than that of theinner opening 50. Thenozzle hole 45 is tapered toward theouter opening 51 at a constant taper rate (refer toFIGS. 4 and5 ). Air that flows out through thenozzle hole 45 is converged along the nozzle hole axis Z by the tapered innerperipheral wall surface 52, so that the injection directivity of air jet can be improved. - Various flowing directions of compressed air in the
air passage 49 of theauxiliary nozzle 5 are schematically shown by dotted arrows inFIG. 6 . Compressed air supplied into theauxiliary nozzle 5 flows toward theupper end 44 of theauxiliary nozzle 5 in theair passage 49 with the highest pressure of compressed air maintained about the center axis X. In theauxiliary nozzle 5 wherein thecenter 50A of theinner opening 50 lies on the weft insertion axis Y and, therefore, thecenter 50A is also projected on the center axis X in the front view of theauxiliary nozzle 5 as shown inFIG. 6 , with the result that most of the high-pressure compressed air can be introduced toward thenozzle hole 45. - The compressed air introduced toward the
nozzle hole 45 is converged along the nozzle hole axis Z by the tapered innerperipheral wall surface 52 and injected at high pressure from theouter opening 51 in the injection direction T indicated by bold arrow inFIG. 6 . Angularly spacing the injection direction T horizontally from the weft insertion axis Y at an angle of α and also vertically from the same axis Y at an angle of β as previously described can improve the directivity of the injection direction T of air jet toward aweft yarn 8 that has been inserted by themain nozzle 3 into theweft guide passage 39. - The present invention is not limited to the preferred embodiment, but may be practiced in various ways as exemplified below.
- (1) The inner
peripheral wall surface 52 of thenozzle hole 45 of theauxiliary nozzle 5 may not necessarily extend straight continuously as seen in a traverse section of the auxiliary nozzle 5 (FIG. 4 ), but may be curved or bent in any way as seen in the same section of theauxiliary nozzle 5, as long as thenozzle hole 45 is tapered outwardly. - (2) The
nozzle hole 45 may not necessarily be tapered at a constant taper rate, but thenozzle hole 45 may be divided into a plurality of regions in the tapering direction which have different taper rates. - (3) The inner
peripheral wall surface 52 of thenozzle hole 45 of theauxiliary nozzle 5 may be formed parallel to the nozzle hole axis Z. - (4) The cross-section of the
nozzle hole 45 of theauxiliary nozzle 5 taken perpendicularly to the nozzle hole axis Z is not limited to be circular in shape, but it may be of any other shape such as ellipsoidal, square or star-shaped. - (5) The flat
front wall 47 and the flatrear wall 48 of theauxiliary nozzle 5 may not necessarily be formed parallel to warp yarns, but they may be disposed so as to be inclined relative to the warp yarns at an angle. - A auxiliary nozzle of an air jet loom includes a nozzle hole formed through a front wall of the auxiliary nozzle and having an inner opening opening to inside of the auxiliary nozzle and an outer opening opening to outside of the auxiliary nozzle. An axis extending in longitudinal direction of the auxiliary nozzle through axial center of the auxiliary nozzle is defined as center axis. An axis intersecting with the center axis and extending in a direction perpendicular to the front wall is defined as weft insertion axis. An axis extending through center of the inner opening and center of the outer opening is defined as nozzle hole axis. The nozzle hole axis is angularly spaced horizontally from the weft insertion axis. Weft insertion is accomplished by compressed air injected from the nozzle hole. The center of the inner opening is positioned on the weft insertion axis.
Claims (5)
- A auxiliary nozzle (5) of an air jet loom comprising:a nozzle hole (45) formed through a front wall (47) of the auxiliary nozzle (5) and having an inner opening (50) opening to inside of the auxiliary nozzle (5) and an outer opening (51) opening to outside of the auxiliary nozzle (5), wherein an axis extending in longitudinal direction of the auxiliary nozzle (5) through axial center of the auxiliary nozzle (5) is defined as center axis (X), wherein an axis intersecting with the center axis (X) and extending in a direction perpendicular to the front wall (47) is defined as weft insertion axis (Y), wherein an axis extending through center (50A) of the inner opening (50) and center (51A) of the outer opening (51) is defined as nozzle hole axis (Z), wherein the nozzle hole axis (Z) is angularly spaced horizontally from the weft insertion axis (Y), wherein weft insertion is accomplished by compressed air injected from the nozzle hole (45), characterized in that the center (50A) of the inner opening (50) is positioned on the weft insertion axis (Y).
- The auxiliary nozzle (5) of an air jet loom according to claim 1, characterized in that the nozzle hole axis (Z) is angularly spaced vertically toward upper end (44) of the auxiliary nozzle (5) from the weft insertion axis (Y).
- The auxiliary nozzle (5) of an air jet loom according to any one of claims 1 and 2, characterized in that the area of the outer opening (51) is smaller than that of the inner opening (50).
- The auxiliary nozzle (5) of an air jet loom according to claim 3, characterized in that the nozzle hole (5) is tapered toward the outer opening (51) at a constant taper rate.
- The auxiliary nozzle (5) of an air jet loom according to any one of claims 1 through 4, characterized in that the cross-section of the nozzle hole (5) taken perpendicularly to the nozzle hole axis (Z) is circular in shape.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011287050A JP5692055B2 (en) | 2011-12-28 | 2011-12-28 | Sub-nozzle of air jet loom |
Publications (2)
Publication Number | Publication Date |
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EP2610378A1 true EP2610378A1 (en) | 2013-07-03 |
EP2610378B1 EP2610378B1 (en) | 2014-05-21 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20120194622 Active EP2610378B1 (en) | 2011-12-28 | 2012-11-28 | Auxiliary nozzle of air jet loom |
Country Status (3)
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EP (1) | EP2610378B1 (en) |
JP (1) | JP5692055B2 (en) |
CN (1) | CN103184648B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3640382A1 (en) * | 2018-10-16 | 2020-04-22 | Tsudakoma Kogyo Kabushiki Kaisha | Sub-nozzle for air jet loom |
CN111926445A (en) * | 2019-05-13 | 2020-11-13 | 津田驹工业株式会社 | Auxiliary nozzle for air jet loom |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105155104A (en) * | 2015-08-06 | 2015-12-16 | 江南大学 | Energy-saving round hole auxiliary nozzle for air jet loom |
JP7311297B2 (en) * | 2018-10-16 | 2023-07-19 | 津田駒工業株式会社 | Sub-nozzle of air jet loom |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0516587A1 (en) * | 1991-05-28 | 1992-12-02 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Auxiliary nozzle in an air jet loom |
JPH0860492A (en) | 1994-08-22 | 1996-03-05 | Toyota Autom Loom Works Ltd | Auxiliary nozzle of air jet loom |
CH688284A5 (en) * | 1994-10-04 | 1997-07-15 | Antonio Bortolamai | Device for inserting weft in shed of air jet loom |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3020103B2 (en) * | 1989-09-08 | 2000-03-15 | 株式会社豊田中央研究所 | Sub-nozzle in air jet loom |
JPH05132837A (en) * | 1991-11-07 | 1993-05-28 | Toyota Autom Loom Works Ltd | Subnozzle in air-jet loom |
JPH06346342A (en) * | 1993-06-02 | 1994-12-20 | Toray Ind Inc | Subnozzle for air-jet loom |
EP0707101A3 (en) * | 1994-10-04 | 1997-10-08 | Antonio Bortolamai | Device for feeding weft threads into the shed in air looms |
JP2001295159A (en) * | 2000-04-04 | 2001-10-26 | Tsudakoma Corp | Subnozzle for weft insertion |
JP5603592B2 (en) * | 2009-12-03 | 2014-10-08 | 株式会社豊田自動織機 | Weft insertion device for air jet loom |
-
2011
- 2011-12-28 JP JP2011287050A patent/JP5692055B2/en active Active
-
2012
- 2012-11-28 EP EP20120194622 patent/EP2610378B1/en active Active
- 2012-12-25 CN CN201210572778.0A patent/CN103184648B/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0516587A1 (en) * | 1991-05-28 | 1992-12-02 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Auxiliary nozzle in an air jet loom |
JPH0860492A (en) | 1994-08-22 | 1996-03-05 | Toyota Autom Loom Works Ltd | Auxiliary nozzle of air jet loom |
CH688284A5 (en) * | 1994-10-04 | 1997-07-15 | Antonio Bortolamai | Device for inserting weft in shed of air jet loom |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3640382A1 (en) * | 2018-10-16 | 2020-04-22 | Tsudakoma Kogyo Kabushiki Kaisha | Sub-nozzle for air jet loom |
CN111058159A (en) * | 2018-10-16 | 2020-04-24 | 津田驹工业株式会社 | Auxiliary nozzle of air jet loom |
CN111926445A (en) * | 2019-05-13 | 2020-11-13 | 津田驹工业株式会社 | Auxiliary nozzle for air jet loom |
EP3739094A1 (en) * | 2019-05-13 | 2020-11-18 | Tsudakoma Kogyo Kabushiki Kaisha | Sub-nozzle for air jet loom |
Also Published As
Publication number | Publication date |
---|---|
EP2610378B1 (en) | 2014-05-21 |
CN103184648B (en) | 2014-04-23 |
JP2013136846A (en) | 2013-07-11 |
JP5692055B2 (en) | 2015-04-01 |
CN103184648A (en) | 2013-07-03 |
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