EP3023525A1 - Main nozzle for air jet loom - Google Patents
Main nozzle for air jet loom Download PDFInfo
- Publication number
- EP3023525A1 EP3023525A1 EP15192889.2A EP15192889A EP3023525A1 EP 3023525 A1 EP3023525 A1 EP 3023525A1 EP 15192889 A EP15192889 A EP 15192889A EP 3023525 A1 EP3023525 A1 EP 3023525A1
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- EP
- European Patent Office
- Prior art keywords
- holder
- brush
- pipe
- diameter
- passage forming
- 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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- 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
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
- The present invention relates to a main nozzle of an air jet loom.
- During weft insertion in an air jet loom, a weft yarn inserted into a shed by a main nozzle is subjected to a strong tension by injection air. When such weft yarn is cut at the selvage of woven fabric after completion of the weft insertion, spring back of the weft yarn occurs, which may cause the weft yarn to be moved out of the main nozzle.
Japanese Patent Application Publication No. 2014-177725 - After cutting of weft yarn, the weft yarn is pulled back into a passage of the accelerator pipe due to the tension acting on the weft yarn. Since the brush is disposed between the weft yarn inlet pipe and the accelerator pipe, the weft yarn having passed through the accelerator pipe is shrunk in a wavy form and caught by filaments of the brush. The brush filaments are arranged to form a space the diameter of which is substantially the same as the diameter of the passage of the weft accelerator pipe, so that the air for insertion of a weft yarn flows smoothly through the brush without being affected by the filaments.
- In the above-described main nozzle of an air jet loom, because the brush has filaments that are made of resin, the filaments are worn due to repeated friction with weft yarn. Though the filaments of the brush are tapered toward the ends thereof, the ends of the filaments are worn, opened or deformed otherwise due to repeated friction with weft yarn. The wear and deformation of the filaments make difficult securely capturing the weft yarn after cutting. Therefore, the brush needs to be replaced periodically.
- In the above-described main nozzle of an air jet loom, in replacing the brush of the main nozzle, the unit including the passage forming pipe, the second holder, the brush, the first holder, and the accelerator pipe need to be removed at a time because of the presence of a large-diameter portion of the passage forming pipe. In this case, however, the weft yarn inlet pipe needs to be removed from the nozzle body previously and then the unit needs to be pulled out upstream of the nozzle body, thus the workability is deteriorated. Alternatively, the second holder, the brush, the first holder, and the accelerator pipe may be pulled out from the nozzle body with the passage forming pipe remained in the nozzle body. In the main nozzle wherein the outer peripheral surface of the second holder is engaged with the inner peripheral surface of a hole of the nozzle body and the inner peripheral surface of the second holder is engaged with the outer peripheral surface of the passage forming pipe, removal of the second holder, the brush, the first holder, and the accelerator pipe from the nozzle body by pulling is difficult because of the friction of the outer and inner peripheral surfaces of the second holder.
- The present invention is directed to providing a main nozzle of an air jet loom, which allows easy replacement of the brush.
- In accordance with one aspect of the present invention, there is provided a main nozzle of an air jet loom that includes a nozzle body, a yarn inlet pipe mounted in the nozzle body to allow introduction of a weft yarn, a passage forming pipe cooperating with an outer peripheral surface of an end portion of the yarn inlet pipe to form a passage of compressed air, an accelerator pipe disposed downstream of the passage forming pipe to accelerate the weft yarn, a first holder holding the accelerator pipe, a brush disposed in a passage of the compressed air between the passage forming pipe and the first holder to catch the weft yarn flowing back from the accelerator pipe, and a second holder holding the brush and the first holder. The passage forming pipe has an end extending from the nozzle body, and the second holder is fixed to the end.
- 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 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:
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FIG. 1 is a longitudinal sectional view of a main nozzle of an air jet loom according to a first embodiment of the present invention; -
FIG. 2 is a fragmentary longitudinal sectional view showing a relevant part of the main nozzle ofFIG. 1 ; -
FIG. 3 is a sectional view taken along the line A-A ofFIG. 2 , showing schematically a brush of the main nozzle; -
FIG. 4 is a perspective view of the brush ofFIG. 3 ; -
FIG. 5 is a fragmentary longitudinal sectional view of the main nozzle ofFIG. 1 , illustrating how a weft yarn is caught; -
FIGS. 6A through 6C are schematic views illustrating a procedure for replacement of the brush ofFIG. 5 ; -
FIG. 7 is a fragmentary longitudinal sectional view showing a relevant part of a main nozzle of an air jet loom according to a second embodiment of the present invention; -
FIG. 8 is a fragmentary longitudinal sectional view showing a relevant part of a main nozzle of an air jet loom according to a third embodiment of the present invention; -
FIG. 9 is a fragmentary longitudinal sectional view of a relevant part of a main nozzle of an air jet loom according to another embodiment (alternative embodiment 1) of the present invention; and -
FIG. 10 is a perspective view of a relevant part of a main nozzle of an air jet loom according to still another embodiment (alternative embodiment 2) of the present invention. - The following will describe a main nozzle of an air jet loom according to a first embodiment of the present invention with reference to
FIGS. 1 to 6 . It is noted that the terms, or upstream (right side ofFIG. 1 ) and downstream (left side ofFIG. 1 ) appearing in the following description are used to denote the directions or relative positions with respect to the direction in which a weft yarn is moved for weft insertion. Referring toFIGS. 1 to 3 , the major parts of the main nozzle include anozzle body 11, ayarn inlet pipe 12, an airpassage forming pipe 13 all of which are fixed to thenozzle body 11, and anaccelerator pipe 14 of weft yarn. - The
nozzle body 11 has therethrough anaxial hole 15 in which theyarn inlet pipe 12 is inserted. Thenozzle body 11 also has therein acompressed air passage 16 that is connected to an air tank (not shown) through a pipe (not shown either). Thehole 15 has a large-diameter hole portion 15A, a small-diameter hole portion 15B, and astepped portion 15C. The large-diameter hole portion 15A is formed in the middle between the upstream side and the downstream side of thehole 15. The small-diameter hole portion 15B is formed downstream of and with a diameter that is smaller than that of the large-diameter hole portion 15A. Thestepped portion 15C is formed between the large-diameter hole portion 15A and the small-diameter hole portion 15B. Thehole 15 further has in a part thereof upstream of the large-diameter hole portion 15A an expandedhole portion 15D having in the inner peripheral surface thereof aninternal thread 26. Theyarn inlet pipe 12 is inserted in thehole 15. Theyarn inlet pipe 12 has therethrough a longitudinalcentral yarn passage 17 and is provided with ayarn guide inlet 19 that is connected to theyarn inlet pipe 12 at the upstream end of theyarn passage 17. Theyarn guide inlet 19 includes aguide member 18 made of a rigid material such as a ceramic and has a funneled opening. - The upstream end of the
yarn inlet pipe 12 is formed as an expandedportion 12A that is formed greater in diameter than the other part of theyarn inlet pipe 12. Theyarn inlet pipe 12 is formed smaller in diameter at the position thereof corresponding to thepassage 16 so that a firstannular chamber 20 is formed between the outer peripheral surface of theyarn inlet pipe 12 and the inner peripheral surface of the large-diameter hole portion 15A of thenozzle body 11. Theyarn inlet pipe 12 is provided with a plurality offins 21 that are equally spaced in the circumferential direction thereof at a positon downstream of the firstannular chamber 20. With theyarn inlet pipe 12 inserted in place in thehole 15 of thenozzle body 11, thefins 21 are in contact at their tips with the inner peripheral surface of the large-diameter hole portion 15A of thenozzle body 11 so that apassage 22 in communication with the firstannular chamber 20 is formed between any twoadjacent fins 21. Theyarn inlet pipe 12 has anend portion 23 that is tapered downward. Theend portion 23 of theyarn inlet pipe 12 need not necessarily be tapered but may be extended straight and parallel to the inner peripheral surface of thenozzle body 11. - A second
annular chamber 24 is formed downstream of thepassages 22. The firstannular chamber 20, thepassages 22, and the secondannular chamber 24 cooperate to form a compressed air passage between the inner peripheral surface of the large-diameter hole portion 15A of thenozzle body 11 and the outer peripheral surface of theyarn inlet pipe 12. The expandedportion 12A of theyarn inlet pipe 12 is formed with anexternal thread 25 that is engaged with aninternal thread 26 formed in the expandedhole portion 15D of thehole 15 of thenozzle body 11 so that theend portion 23 of theyarn inlet pipe 12 is positioned appropriately in thenozzle body 11 by screwing theyarn inlet pope 12 into thehole 15 of thenozzle body 11. Tightening alock nut 27 engaged with theexternal thread 25 of the expandedportion 12A, theyarn inlet pipe 12 is fixed to thenozzle body 11. - The
passage forming pipe 13 is disposed in thehole 15 of thenozzle body 11 at a position downstream of theyarn inlet pipe 12. Thepassage forming pipe 13 has on its upstream side a large-diameter portion 28 and on its downstream side a small-diameter portion 29 having a smaller diameter than the large-diameter portion 28. The outer diameter of the large-diameter portion 28 is set corresponding to the inner diameter of the large-diameter hole portion 15A of thenozzle body 11. The outer diameter of the small-diameter portion 29 is set corresponding to the inner diameter of the small-diameter hole portion 15B of thenozzle body 11. The large-diameter portion 28 has therein a tapered innerperipheral surface 30 and the small-diameter portion 29 has therethrough apassage 31 extending downstream of the innerperipheral surface 30. Theend portion 23 of theyarn inlet pipe 12 is inserted in a tapered hole formed by the tapered innerperipheral surface 30. The tapered innerperipheral surface 30 cooperates with the outer peripheral surface of thetapered end portion 23 of theyarn inlet pipe 12 to form therebetween apassage 32 through which compressed air flows. Thepassage forming pipe 13 is inserted in thehole 15 of thenozzle body 11 with the small-diameter portion 29 inserted in the small-diameter hole portion 15B and the large-diameter portion 28 inserted in the large-diameter hole portion 15A so that a steppedportion 33 between the large-diameter portion 28 and the small-diameter portion 29 is engaged with the steppedportion 15C of thehole 15. As a result, thepassage forming pipe 13 is positioned correctly in thehole 15 in the axial direction of the main nozzle. - As shown in
FIG. 1 , the small-diameter portion 29 of thepassage forming pipe 13 extends out from thenozzle body 11. Thepassage forming pipe 13 has at the end of the small-diameter portion 29 afront end 34 extending from the small-diameter portion 29. Asecond holder 35 is fixed on thefront end 34 and provided with afirst holder 36 holding theaccelerator pipe 14. Abrush 37 is disposed between thefront end 34 of thepassage forming pipe 13 and thefirst holder 36. - As shown in
FIG. 2 , thefront end 34 of thepassage forming pipe 13 has an outer diameter that is smaller than that of the small-diameter portion 29. Thefront end 34 is formed with anexternal thread 43 on the outer peripheral surface of thepassage forming pipe 13. Thesecond holder 35 has in the upstream end thereof a first connectinghole 38. The first connectinghole 38 includes a large-diameter hole portion 38A having a diameter that corresponds to the outer diameter of the small-diameter portion 29 of thepassage forming pipe 13, a small-diameter hole portion 38B that is formed downstream of the large-diameter hole portion 38A and having a diameter that is smaller than that of the large-diameter hole portion 38A, and a steppedportion 38C formed between the large-diameter hole portion 38A and the small-diameter hole portion 38B. The small-diameter hole portion 38B of thesecond holder 35 is formed with a firstinternal thread 39 on the inner peripheral surface of the small-diameter hole portion 38B. The firstinternal thread 39 is engaged with theexternal thread 43 of thefront end 34 of thepassage forming pipe 13. The first connectinghole 38 corresponds to a connecting hole for connecting thesecond holder 35 and thepassage forming pipe 13. - The
front end 34 of thepassage forming pipe 13 is inserted in the first connectinghole 38 of thesecond holder 35 through screw engagement between theexternal thread 43 of thefront end 34 and the firstinternal thread 39 of the small-diameter hole portion 38B of the first connectinghole 38. Thus, thefront end 34 of thepassage forming pipe 13 is fastened to thesecond holder 35. The steppedportion 55 between the small-diameter portion 29 and thefront end 34 of thepassage forming pipe 13 is engaged with the steppedportion 38C of the first connectinghole 38 of thesecond holder 35, thus thesecond holder 35 being positioned correctly with respect to thepassage forming pipe 13. The outer peripheral surface of the small-diameter portion 29 of thepassage forming pipe 13 and the inner peripheral surface of the small-diameter hole portion 38B of thesecond holder 35 are in contact with each other. Therefore, thepassage forming pipe 13 and thesecond holder 35 are connected together coaxially by thread engagement between thefront end 34 of thepassage forming pipe 13 and the small-diameter hole portion 38B of thesecond holder 35 with the axis L1 of thepassage forming pipe 13 set in alignment with the axis L2 of the first connectinghole 38 of the second holder 35 (shown inFIGS. 3 and6 ). The outer peripheral surface of the small-diameter portion 29 and the inner peripheral surface of the large-diameter hole portion 38A are in contact with each other. - The
second holder 35 has in the downstream end thereof a second connectinghole 40. The second connectinghole 40 includes a large-diameter hole portion 40A the inner diameter of which corresponds to the outer diameter of acylindrical portion 49 of thefirst holder 36, a small-diameter hole portion 40B that is formed upstream end of the large-diameter hole portion 40A and having a diameter that is smaller than that of the large-diameter hole portion 40A, and a steppedportion 40C formed between the large-diameter hole portion 40A and the small-diameter hole portion 40B. The large-diameter hole portion 40A is formed in the downstream end portion and on the inner peripheral surface thereof with a secondinternal thread 41. The second connectinghole 40 corresponds to a connecting hole for connecting thesecond holder 35 and thefirst holder 36. The first connectinghole 38 and the second connectinghole 40 are formed coaxially, having the same central axis L2. The first connectinghole 38 and the second connectinghole 40 of thesecond holder 35 communicate with each other through ahole 42. - Referring to
FIG. 4 , thebrush 37 includes abrush holder 44 and a number offilaments 45. Thebrush holder 44 includes a small-diameter portion 46 provided on the upstream side of thebrush holder 44 and a large-diameter portion 47 provided downstream of the small-diameter portion 46 and a steppedportion 56 between the small-diameter portion 46 and the large-diameter portion 47. Thebrush holder 44 has therethrough at the axial center thereof ahole 48 through which air flows. Thefilaments 45 are mounted in the downstream end of the large-diameter portion 47 of thebrush holder 44 and bonded thereto by means such as an adhesive. Thefilaments 45 are arranged along the circumference of thehole 48, and directed downstream. The circumferentially arrangedfilaments 45 as a whole are tapered downstream. Each of the filaments is made of a material such as resin, metal or animal hair. - As shown in
FIGS. 2 and 3 , thebrush 37 is inserted in the second connectinghole 40 of thesecond holder 35. The positioning of thebrush 37 is accomplished by engagement of the small-diameter portion 46 of thebrush holder 44 with the small-diameter hole portion 40B of the second connectinghole 40 and engagement of the large-diameter portion 47 of thebrush holder 44 with the large-diameter hole portion 40A of the second connectinghole 40. Thefirst holder 36 is disposed downstream of thebrush 37 to hold theaccelerator pipe 14. Thefirst holder 36 includes acylindrical portion 49 and aflange portion 50 that is provided at the downstream end of thecylindrical portion 49. Thecylindrical portion 49 has on the outer peripheral surface thereof adjacent to theflange portion 50 anexternal thread 51 that is engaged with the secondinternal thread 41 of thesecond holder 35. Thefirst holder 36 has ahole 52. A part of the upstream end of theaccelerator pipe 14 is inserted in thehole 52 and bonded by an adhesive, so that theaccelerator pipe 14 and thefirst holder 36 are integrated. Theaccelerator pipe 14 has therein apassage 53. Thefirst holder 36 has at the upstream end portion thereof apassage 54 that extends downstream of thefirst holder 36 and has a funneled inner peripheral surface. The downstream end of thepassage 54 is smoothly connected to the upstream end of thepassage 53 of theaccelerator pipe 14 because no stepped portion is formed between thepassages - The
cylindrical portion 49 of thefirst holder 36 is inserted in the second connectinghole 40 of thesecond holder 35. Tightening theexternal thread 51 of thecylindrical portion 49 with the secondinternal thread 41 of the second connectinghole 40, thefirst holder 36 is screwed into thesecond holder 35 for fastening. Then, the upstream end surface of thecylindrical portion 49 is in contact with the downstream end surface of the large-diameter portion 47 of thebrush 37, so that thebrush 37 is positioned correctly in the axial direction thereof. Thefilaments 45 of thebrush 37 are arranged along the inner peripheral surface of the taperedpassage 54 of thefirst holder 36. Thus, the circular space formed by the tip ends of thefilaments 45 has substantially the same diameter as the inner diameters of thehole 48 and thepassage 53 of the accelerator pipe 14 (shown inFIG. 3 ). It is noted that thehole 48 and thepassage 53 have substantially the same inner diameter. - The
brush 37 is disposed in a part of the compressed air passage between thepassage forming pipe 13 and theaccelerator pipe 14 held by thefirst holder 36 and serves as a weft yarn catcher. As shown inFIG. 5 , though the weft yarn Y after completion of the weft insertion is shrunk with the cutting of the weft yarn Y, the weft yarn Y is caught by thefilaments 45 of thebrush 37. Thebrush 37 is interposed between the stepped portion between thehole 42 and the small-diameter hole portion 40B of thesecond holder 35 and the upstream end of thefirst holder 36. Thepassage 31 of thepassage forming pipe 13 and thehole 48 of thebrush 37 communicate with each other through thehole 42 that is formed in thesecond holder 35. It is noted that thepassage 31, thehole 42, and thehole 48 have substantially the same inner diameter. - The following will describe the procedure for replacing the
brush 37 with reference toFIGS. 6A, 6B and 6C . For removing thebrush 37, rotating thesecond holder 35, the engagement of theexternal thread 43 of thefront end 34 of thepassage forming pipe 13 and the firstinternal thread 39 of the small-diameter hole portion 38B of thesecond holder 35 is released and thesecond holder 35 is removed from thepassage forming pipe 13, as shown inFIG. 6A . - Next, rotating the
first holder 36, the secondinternal thread 41 of the second connectinghole 40 of thesecond holder 35 and theexternal thread 51 of thecylindrical portion 49 of thefirst holder 36 are disengaged and thefirst holder 36 is removed from thesecond holder 35 as shown inFIG. 6B . Since theaccelerator pipe 14 and thefirst holder 36 are integrated, theaccelerator pipe 14 and thefirst holder 36 are removed as a unit. - Next, as shown in
FIG. 6C , thesecond holder 35 and thebrush 37 are disengaged and thebrush 37 is removed from thesecond holder 35. - A
new brush 37 is mounted by the following procedure that is reverse to the removing of thebrush 37. Thebrush holder 44 havingnew brush 37 is mounted in the second connectinghole 40 of thesecond holder 35. Thefirst holder 36 integrated with theaccelerator pipe 14 is inserted into the second connectinghole 40 of thesecond holder 35. Thefirst holder 36 is screwed into thesecond holder 35 to be fastened thereto. Thesecond holder 35 is mounted on thefront end 34 of thepassage forming pipe 13. Thesecond holder 35 is screwed and fastened to thepassage forming pipe 13. - The following will describe the operation of the above-described main nozzle of an air jet loom according to the first embodiment. For weft insertion during the operation of the air jet loom, compressed air is supplied through the
passage 16 to the firstannular chamber 20 in response to the operation of an air valve (not shown). The compressed air smoothed bypassage 22 and flowing through the secondannular chamber 24 is injected into thepassage 31 from the restrictedpassage 32. A weft yarn Y introduced into theyarn passage 17 of theyarn inlet pipe 12 and present between thepassage 31 and thepassage 53 and extending into thepassage 53 is inserted by air injected through thepassage 32. - Since the
filaments 45 of thebrush 37 are disposed in thepassage 54 having a larger diameter than theyarn passage 17 of theyarn inlet pipe 12 and the space surrounded by the downstream ends of thefilaments 45 of thebrush 37 has substantially the same diameter as thepassage 53 of theaccelerator pipe 14, air injected from thepassage 32 is less affected by thefilaments 45 of thebrush 37 as compared to the case of the above-cited background art, flowing smoothly through thepassage 31, thehole 42, thehole 48, and thepassage 53, so that the weft yarn Y is moved properly. Passing through thepassage 53, the weft yarn Y is directed from theaccelerator pipe 14 and then inserted into a warp shed (not shown). - When the weft insertion is completed and the weft yarn Y is cut by a cutter (not shown), the weft yarn Y that is closer to the main nozzle is pulled back upstream due to tension acting thereon and moved back into the
passage 53 of theaccelerator pipe 14. As shown inFIG. 5 , the weft yarn Y remaining in the accelerator pipe 4 is shrunk in a wavy form while being brought into repeated contact with the inner wall of thepassage 53 of theaccelerator pipe 14. The weft yarn Y having passed through theaccelerator pipe 14 and shrunk at a position where thebrush 37 is disposed is caught successfully by thefilaments 45 of thebrush 37. Such shrinkage movement of the weft yarn Y is stopped by thefilaments 45, so that the leading end of the weft yarn Y remains thepassage 53 of theaccelerator pipe 14. - At a start of the subsequent weft insertion, air injected from the
passage 32 serves to insert into a warp shed the weft yarn Y which has been caught by thefilaments 45 of thebrush 37 and present in thepassage 53, so that weft insertion is performed properly. On the other hand, repeated friction of thefilaments 45 of thebrush 37 and the weft yarn Y causes wear to thefilaments 45 of thebrush 37. Though eachfilament 45 of thebrush 37 has a tapered end, repeated friction of thefilaments 45 of thebrush 37 and the weft yarn Y widens the tapered ends of thefilaments 45. Abrasion and deformation of thefilaments 45 may prevent the weft yarn Y from being caught securely. The widened ends of thefilaments 45 may prevent smooth flow of injection air in thepassage 31. Thus, thebrush 37 needs to be replaced periodically with a new one. - In the main nozzle of the present embodiment wherein the
brush 37 is disposed in thesecond holder 35 and held between thesecond holder 35 and thefirst holder 36, replacement of thebrush 37 may be accomplished by loosening off thesecond holder 35 from thepassage forming pipe 13. The use of thread engagement for fastening a fastener facilitates removing thesecond holder 35 from thepassage forming pipe 13. - Next, the
first holder 36 is loosened off from thesecond holder 35. Then, thefirst holder 36 is removed from thesecond holder 35. Such a threaded fastener facilitates removing thefirst holder 36 from thesecond holder 35. - Next, the
brush holder 44 of thebrush 37 is unfastened from the small-diameter hole portion 40B of the second connectinghole 40 of thesecond holder 35. Then, thebrush 37 is removed from thesecond holder 35. Thebrush holder 44 of thebrush 37 that is engaged with the second connectinghole 40 of thesecond holder 35 may be removed easily from thesecond holder 35 by applying force in the axial direction. - Thus, removal of the
brush 37 is easily accomplished by removing thesecond holder 35 from thepassage forming pipe 13, removing thefirst holder 36 from thesecond holder 35, and removing thebrush 37 from thesecond holder 35. Installation of anew brush 37 is accomplished by the procedure that is reverse to the removal of thebrush 37. That is, replacing thebrush 37 with a new one is implemented by performing three steps, which facilitates replacing and mounting of thebrush 37 and shortens working time. - With the
passage forming pipe 13 screwed in thesecond holder 35, the outer peripheral surface of the small-diameter portion 29 of thepassage forming pipe 13 and the inner peripheral surface of the large-diameter hole portion 38A of thesecond holder 35 are in contact with each other so that allow thepassage forming pipe 13 and thesecond holder 35 to be connected coaxially. That is, with theexternal thread 43 formed on the outer peripheral surface of thefront end 34 of thepassage forming pipe 13 and the firstinternal thread 39 formed on an inner peripheral surface of the small-diameter hole portion 38B of thesecond holder 35 engaged with each other, the central axis L1 of thepassage forming pipe 13 corresponds to the central axis L2 of thesecond holder 35 and thepassage forming pipe 13 and thesecond holder 35 are connected coaxially. As compared with the prior art main nozzle, thesecond holder 35 that is in sliding contact at the inner peripheral surface thereof with the outer peripheral surface of the small-diameter portion 29 may be removed easily from thepassage forming pipe 13. The first connectinghole 38 and the second connectinghole 40 are formed coaxially in thesecond holder 35, having the same central axis L2. Thefirst holder 36 that is fastened to the inner peripheral surface of the second connectinghole 40 and theaccelerator pipe 14 that is integrated with thefirst holder 36 are assembled coaxially with thepassage forming pipe 13 that is fastened to the inner peripheral surface of the first connectinghole 38. Thefirst holder 36, theaccelerator pipe 14, and the first connectinghole 38 have the same central axis. - The
passage forming pipe 13, thesecond holder 35, and thefirst holder 36 are connected coaxially, so that thepassage 31 of thepassage forming pipe 13, thehole 42 formed in thesecond holder 35, thehole 48 of thebrush 37, and thepassage 53 of theaccelerator pipe 14 have the same central axis extend coaxially, with the result that air is flowed smoothly along the air passage and the inserted weft yarn Y is moved properly. - The main nozzle according to the first embodiment offers the following advantageous effects.
- (1) The
second holder 35 is fixed to thefront end 34 of thepassage forming pipe 13 extending from thenozzle body 11. In replacing thebrush 37, thesecond holder 35 is removed from thepassage forming pipe 13 by disengagement of theexternal thread 43 of the outer periphery of thefront end 34 of thepassage forming pipe 13 and the firstinternal thread 39 of the first connectinghole 38 of thesecond holder 35. Next, thefirst holder 36 is removed from thesecond holder 35 by disengagement of the secondinternal thread 41 of the second connectinghole 40 of thesecond holder 35 and theexternal thread 51 of thecylindrical portion 49 of thefirst holder 36. Finally, thebrush 37 is removed from thesecond holder 35 by disengagement of thebrush holder 44 from the second connectinghole 40 of thesecond holder 35. Replacement of anew brush 37 is performed in a procedure reverse to the above. Thus, the replacement of thebrush 37 may be performed easily and in a shortened time. - (2) With the
passage forming pipe 13 screwed in thesecond holder 35, the outer peripheral surface of the small-diameter portion 29 of thepassage forming pipe 13 and the inner peripheral surface of the large-diameter hole portion 38A of thesecond holder 35 are in contact with each other so that allows thepassage forming pipe 13 and thesecond holder 35 to be connected coaxially with each other. That is, with theexternal thread 43 of thefront end 34 of thepassage forming pipe 13 and the firstinternal thread 39 of the small-diameter hole portion 38B of thesecond holder 35 engaged with each other, the central axis L1 of thepassage forming pipe 13 corresponds to the central axis L2 of thesecond holder 35 and thepassage forming pipe 13 and thesecond holder 35 are connected coaxially. Accordingly, thepassage 31 of thepassage forming pipe 13, thehole 42 formed in thesecond holder 35, thehole 48 of thebrush 37, and thepassage 53 of theaccelerator pipe 14 have the same central axis, so that air is flowed smoothly along the air flow passage and the weft yarn Y after insertion is moved properly. - (3) Unlike the prior art main nozzle, in the main nozzle of the present embodiment wherein the
second holder 35 is disposed outside thenozzle body 11, thesecond holder 35 that receives no dimensional restriction from thenozzle body 11 may be made large as required. Therefore, machining of the firstinternal thread 39 and the secondinternal thread 41 may be made easily after drilling the first connectinghole 38 and the second connectinghole 40, respectively. - (4) Since the
second holder 35 is disposed outside thenozzle body 11, the outer peripheral surface of thesecond holder 35 dispenses with high precision machining. Therefore, productivity in machining of thesecond holder 35 is improved. - (5) In the main nozzle of the present embodiment wherein the
brush 37 is interposed between thesecond holder 35 and thefirst holder 36, removing thefirst holder 36 from thesecond holder 35 allows thebrush 37 to be disengaged from axial restriction in thesecond holder 35. Therefore, thebrush 37 can be removed from thesecond holder 35 without removing thesecond holder 35 from thepassage forming pipe 13, so that brush replacement becomes easy. - The following will describe a main nozzle according to a second embodiment of the present invention with reference to
FIG. 7 . The second embodiment differs from the first embodiment in that the structure holding a brush disposed in the second holder is modified. The rest of the structure of the main nozzle is substantially the same as that of the first embodiment. Common or similar parts or elements are designated by the same reference numerals as those of the first preferred embodiment and, therefore, the description thereof will be omitted and the modifications will be described. - As shown in
FIG. 7 , anannular recess 61 is formed in thefront end 34 of thepassage forming pipe 13 so as to surround thepassage 31 of thepassage forming pipe 13. A first connectinghole 62 is formed in the upstream end of thesecond holder 60. The first connectinghole 62 includes a large-diameter hole portion 62A the inner diameter of which corresponds to the outer diameter of the small-diameter portion 29 of thepassage forming pipe 13, a medium-diameter hole portion 62B that is connected to the downstream end of the large-diameter hole portion 62A and smaller in diameter than the large-diameter hole portion 62A, and a small-diameter hole portion 62C that is connected to the downstream end of the medium-diameter hole portion 62B and smaller in diameter than the medium-diameter hole portion 62B. The first connectinghole 62 has therein a steppedportion 62D formed between the large-diameter hole portion 62A and the medium-diameter hole portion 62B and a steppedportion 62E formed between the medium-diameter hole portion 62B and the small-diameter hole portion 62C. Thus, the first connectinghole 62 has three different hole portions and two different stepped portions. A firstinternal thread 63 is formed on the inner peripheral surface of the medium-diameter hole portion 62B engaged with theexternal thread 43 at thefront end 34 of thepassage forming pipe 13. The first connectinghole 62 corresponds to a connecting hole for connecting thesecond holder 60 and thepassage forming pipe 13. Thebrush holder 44 of thebrush 37 is fitted at the large-diameter portion 47 thereof in the small-diameter hole portion 62C of the first connectinghole 62. - A second connecting
hole 64 is formed in the downstream end of thesecond holder 60. The second connectinghole 64 includes a large-diameter hole portion 64A the inner diameter of which corresponds to the outer diameter of the large-diameter portion 67A of thefirst holder 67, a small-diameter hole portion 64B that is connected to the upstream end of the large-diameter hole portion 64A and smaller in diameter than the large-diameter hole portion 64A. The second connectinghole 64 has a steppedportion 64C formed between the large-diameter hole portion 64A and the small-diameter hole portion 64B. A secondinternal thread 65 is formed on the inner peripheral surface of the small-diameter hole portion 64B. The second connectinghole 64 corresponds to a connecting hole for connecting thesecond holder 60 and thefirst holder 67. The first connectinghole 62 and the second connectinghole 64 are formed coaxially, having the same central axis. The first connectinghole 62 and the second connectinghole 64 of thesecond holder 60 communicate with each other through a taperedhole 66. Thehole 66 is tapered downstream of thesecond holder 60, having a funneled inner peripheral surface. - The
brush 37 is inserted into the first connectinghole 62 of thesecond holder 60 with the large-diameter portion 47 of thebrush holder 44 fitted in the small-diameter hole portion 62C of the first connectinghole 62. Then, the tips of thefilaments 45 of thebrush 37 are arranged along the inner peripheral surface of thehole 66 of thesecond holder 60. Next, thefront end 34 of thepassage forming pipe 13 is inserted into the first connectinghole 62 of thesecond holder 60. Theexternal thread 43 of thefront end 34 is engaged with the firstinternal thread 63 of the medium-diameter hole portion 62B of the first connectinghole 62. Thus, thefront end 34 of thepassage forming pipe 13 is fastened to thesecond holder 60. Then, the small-diameter portion 46 of thebrush holder 44 of thebrush 37 is fitted in therecess 61 of thepassage forming pipe 13. Allowing the downstream end surface of thefront end 34 of thepassage forming pipe 13 to be engaged with the steppedportion 62E of the first connectinghole 62, with the steppedportion 56 between the large-diameter portion 47 and the small-diameter portion 46 of thebrush holder 44, thesecond holder 60 and thebrush 37 are positioned correctly at a time. - The
first holder 67 for holding theaccelerator pipe 14 is disposed downstream of thebrush 37. Thefirst holder 67 includes the large-diameter portion 67A the outer diameter of which corresponds to the inner diameter of the large-diameter hole portion 64A, a small-diameter portion 67B that is connected to the upstream end of the large-diameter portion 67A and smaller in outer diameter than the large-diameter portion 67A, and aflange portion 67C formed downstream of the large-diameter portion 67A. The small-diameter portion 67B has on the outer peripheral surface thereof anexternal thread 68 for engagement with the secondinternal thread 65. Thefirst holder 67 has axially therethrough ahole 69. The upstream end of theaccelerator pipe 14 is inserted in thehole 69. Theaccelerator pipe 14 and thefirst holder 67 are bonded together of an adhesive. - The large-
diameter portion 67A and the small-diameter portion 67B of thefirst holder 67 are inserted in the second connectinghole 64 of thesecond holder 60. Thefirst holder 67 may be fastened to thesecond holder 60 by engagement of theexternal thread 68 of the small-diameter portion 67B with the secondinternal thread 65 of the small-diameter hole portion 64B of the second connectinghole 64. Thefirst holder 67 and thesecond holder 60 may be fastened together by screwing thefirst holder 67 into thesecond holder 60. Then, the upstream end surface of the small-diameter portion 67B of thefirst holder 67 is in contact with the bottom surface of the small-diameter hole portion 64B of the second connectinghole 64, or with the stepped portion between thehole 66 and the small-diameter hole portion 64B, so that thefirst holder 67 is positioned correctly in the axial direction thereof. - Thus, according to the main nozzle of the second embodiment, the
brush 37 is disposed inside thesecond holder 60 and held between thepassage forming pipe 13 and thesecond holder 60. In the replacement of thebrush 37, the engagement of theexternal thread 43 of the outer periphery of thefront end 34 of thepassage forming pipe 13 and the firstinternal thread 63 on the inner periphery of the first connectinghole 62 of thesecond holder 60 is loosened off from thepassage forming pipe 13. Next, disengaging thebrush holder 44 from the small-diameter hole portion 62C of the first connectinghole 62, thebrush 37 is removed from thesecond holder 60. Since thebrush 37 is held between the small-diameter portion 29 of thepassage forming pipe 13 and thesecond holder 60, thebrush 37 is prevented from falling in removing thefirst holder 67 from thesecond holder 60 for replacement of theaccelerator pipe 14. - The following will describe a main nozzle according to a third embodiment with reference to
FIG. 8 . The third embodiment differs from the first embodiment in that the structure fixing the second holder to the passage forming pipe and thefirst holder 36 is modified. The rest of the structure of the main nozzle is substantially the same as that of the first embodiment. Common or similar parts or elements are designated by the same reference numerals as those of the first preferred embodiment and, therefore, the description thereof will be omitted and the modifications will be described. - As shown in
FIG. 8 , afront end 70 of thepassage forming pipe 13 is smaller in outer diameter than the small-diameter portion 29. Unlike the first embodiment, thefront end 70 has no external thread. A first connectinghole 72 is formed in the upstream end of thesecond holder 71. The first connectinghole 72 of thesecond holder 71 includes a large-diameter portion 72A the inner diameter of which corresponds to the outer diameter of the small-diameter portion 29 of thepassage forming pipe 13 and a small-diameter portion 72B the inner diameter of that corresponds to the outer diameter of thefront end 70 of thepassage forming pipe 13 and is connected to the large-diameter portion 72A and a small-diameter portion 72B that is connected to the downstream end of the large-diameter portion 72A and has an inner diameter corresponding to the outer diameter of thefront end 70 of thepassage forming pipe 13, and a steppedportion 72C is formed between the large-diameter portion 72A and the small-diameter portion 72B. Unlike the first embodiment, the small-diameter portion 72B has no internal thread. The first connectinghole 72 corresponds to a connecting hole for connecting thesecond holder 71 and thepassage forming pipe 13. A plurality of threadedholes 73 is formed through the peripheral wall of thesecond holder 71 at positions adjacent to the opposite ends of thesecond holder 71 and spaced circumferentially at an interval. - The
front end 70 of thepassage forming pipe 13 is inserted into the first connectinghole 72 of thesecond holder 71 so that thefront end 70 is engaged with the small-diameter portion 72B of the first connectinghole 72 and the end portion of the small-diameter portion 29 is engaged with the large-diameter portion 72A of the first connectinghole 72. With the stepped portion between the small-diameter portion 29 of thepassage forming pipe 13 and thefront end 70 engaged in contact with the steppedportion 72C of the first connectinghole 72, thesecond holder 71 is positioned correctly with respect to thepassage forming pipe 13. Next, screwing theset screws 74 into the respective threadedholes 73 of thesecond holder 71, thesecond holder 71 is fixed to thepassage forming pipe 13 and thefirst holder 77, so that thepassage forming pipe 13 is prevented from being pulled out from the first connectinghole 72 of thesecond holder 71. - The
second holder 71 has therein a second connectinghole 75. The second connectinghole 75 includes a large-diameter hole portion 75A that corresponds to thecylindrical portion 78 of thefirst holder 77, a small-diameter hole portion 75B that is connected to the upstream end of the large-diameter hole portion 75A and smaller in diameter than the large-diameter hole portion 75A, and a stepped portion 75C that is formed between the large-diameter hole portion 75A and the small-diameter hole portion 75B. Unlike the first embodiment, the large-diameter hole portion 75A has no internal thread. The second connectinghole 75 corresponds to a connecting hole for connecting thesecond holder 71 and thefirst holder 77. The first connectinghole 72 and the second connectinghole 75 are formed coaxially, having the same central axis. The first connectinghole 72 and the second connectinghole 75 of thesecond holder 35 communicate with each other through thehole 76. - The
brush 37 is inserted into the second connectinghole 75 of thesecond holder 71 with the small-diameter portion 46 of thebrush holder 44 fitted in the small-diameter hole portion 75B of the second connectinghole 75 and the large-diameter portion 47 of thebrush holder 44 fitted in the large-diameter hole portion 75A of the second connectinghole 75, respectively. Thefirst holder 77 is disposed downstream of thebrush 37 and holds theaccelerator pipe 14. Thefirst holder 77 has thecylindrical portion 78 and aflange portion 79 formed downstream of thecylindrical portion 78. Unlike the first embodiment, thecylindrical portion 78 ha no external thread. Thefirst holder 77 has therethrough ahole 80. The upstream end of theaccelerator pipe 14 is inserted in thehole 80. Theaccelerator pipe 14 and thefirst holder 77 are bonded together by an adhesive. Thefirst holder 77 has therein at the upstream end portion thereof apassage 81 that is tapered downstream of thefirst holder 77 and has a funneled inner peripheral surface. The downstream end of the taperedpassage 81 is smoothly connected to the upstream end of thepassage 53 of theaccelerator pipe 14. - The
cylindrical portion 78 of thefirst holder 77 is inserted into the second connectinghole 75 of thesecond holder 71 and engaged with the large-diameter hole portion 75A of the second connectinghole 75. Then, the upstream end surface of thecylindrical portion 78 is in contact with the downstream end surface of the large-diameter portion 47 of thebrush holder 44 of thebrush 37, so that thebrush 37 is positioned correctly in the axial direction thereof. The tips of thefilaments 45 of thebrush 37 are arranged along the inner peripheral surface of thepassage 81 of thefirst holder 77. Thus, like the first embodiment, the circular space formed by the tip ends of thefilaments 45 has substantially the same diameter as thehole 48 and thepassage 53 of theaccelerator pipe 14. Next, screwing theset screws 74 into the respective threadedholes 73, thefirst holder 77 and thesecond holder 71 are fixed together and thefirst holder 77 is prevented from being pulled out from the second connectinghole 75 of thesecond holder 71. - The following will describe a procedure for replacing the
brush 37. First, loosening theset screws 74, thesecond holder 71 is removed from thepassage forming pipe 13 and thefirst holder 77 is removed from thesecond holder 71, respectively. Finally, thebrush 37 is removed from thesecond holder 71. - Thus, in the main nozzle according to the third embodiment, the threaded
holes 73 may be formed at any desired positions of thesecond holder 71 in the circumferential direction thereof so that no interference occurs between the head portion of theset screw 74 and any part provided adjacent to the main nozzle. The use of theset screw 74 for connecting thesecond holder 71 to thepassage forming pipe 13 and thefirst holder 77 dispenses with machining for forming thread in thesecond holder 71, thepassage forming pipe 13 and thefirst holder 77 and, therefore, the manufacturing of the main nozzle is facilitated and the procedure of brush replacement is simplified. Furthermore, theset screw 74 and the threadedhole 73 may be so configured that no part of theset screw 74 extends out from the threadedhole 73 mounted in thesecond holder 71 so that the head portion of theset screw 74 does not extend outside of the outer peripheral surface of thesecond holder 71. By so configuring, the space around thesecond holder 71 can be utilized effectively. - The present invention is not limited to the above-described embodiments, but may be modified in various alternative embodiments, as exemplified below, within the scope of the invention. Referring to
FIG. 9 , showing analternative embodiment 1 of the present invention, asecond holder 90, apassage forming pipe 91, and afirst holder 92 are provided with their respective flanges extending radially outwardly. Any pair of two adjacent flanges are set in contact with each other and fixed together by bolts. To describe more specifically with reference toFIG.9 , thesecond holder 90 has at the upstream end thereof aflange portion 93 and at the downstream end thereof aflange portion 94. Thesecond holder 90 further has therein a first connectinghole 95 extending in downstream portion thereof and a second connectinghole 96 extending in upstream portion thereof. A plurality of threadedholes 93A is formed through theflange portion 93 and spaced at an interval in the circumferential direction of theflange portion 93. A plurality of threadedholes 94A is formed through theflange portion 94 and spaced at an interval in the circumferential direction of theflange portion 94. Thepassage forming pipe 91 is formed at position adjacent to the downstream end of the small-diameter portion 97 of the passage forming pipe 9 of aflange portion 98 that is to be in contact with theflange portion 93 of thesecond holder 90. Theflange portion 98 has therefthrough a plurality ofholes 98A that are spaced at such an interval in the circumferential direction of theflange portion 98 that theholes 98A correspond to the respective threadedholes 93A formed through theflange portion 93. The front end of the small-diameter portion 97 of thepassage forming pipe 91 is inserted into the first connectinghole 95 of thesecond holder 90 and so that theflange portion 98 is in contact with theflange portion 93. With theholes 98A and their corresponding threadedholes 93A aligned coaxially, thebolts 99 are inserted through theholes 98A, as shown inFIG. 9 , and tightened into the corresponding threadedholes 93A, thereby fastening thepassage forming pipe 91 and thesecond holder 90 together. By so fastening, thesecond holder 90 is positioned correctly with respect to thepassage forming pipe 91. Thefirst holder 92 includes acylindrical portion 100 and aflange portion 101 that is disposed at the downstream end of thecylindrical portion 100 and in contact with theflange portion 94. Theflange portion 101 has therethrough a plurality ofholes 101A that are spaced at such an interval in the circumferential direction of theflange portion 101 that theholes 101A correspond to the respective threadedhole 94A formed through theflange portion 94. With the second connectinghole 96 of thesecond holder 90 engaged with thebrush 37, thecylindrical portion 100 of thefirst holder 92 is inserted into the second connectinghole 96 so that theflange portion 101 is in contact with theflange portion 94 of thesecond holder 90. With theholes 101A and their corresponding threadedholes 94A aligned coaxially, thebolts 99 are inserted through theholes 101A, as shown inFIG. 9 , and tightened into the corresponding threadedholes 94A, thereby fastening thefirst holder 92 and thesecond holder 90 together. Thefirst holder 92 is positioned correctly with respect to thesecond holder 90. In this case, thesecond holder 90 and thepassage forming pipe 91 are fastened by thebolts 99 with theflange portions second holder 90 and thefirst holder 92 are fastened by thebolts 99 with theflange portions bolts 99 allows thepassage forming pipe 91 and thefirst holder 92 to be removed from thesecond holder 90. Thus, the replacement of thebrush 37 may be performed easily. Furthermore, the disposition of thebolts 99 that extend parallel to the main nozzle is advantageous in the arrangement of a plurality of main nozzles one above the other in a multicolor weft insertion apparatus of an air jet loom. - Referring to
FIG. 10 , showing an alternative embodiment 2, thesecond holder 110 is of a split type that includes afirst holder member 111 and asecond holder member 112 each having a half cylinder shape. Though not shown in the drawing, thesecond holder 110 has therein on the upstream side thereof the front end of thepassage forming pipe 13 and thefirst holder 113 integrating thebrush 37 and theaccelerator pipe 14. The first andsecond holder members surfaces second holder members first holder member 111 has therethrough a plurality ofholes 114 each having an opening at thesurface 111A and an opening at the outer cylindrical surface thereof. Thesecond holder member 112 has therein a plurality of threadedholes 115. The threadedholes 115 are formed in such a way that, with thesurface 111A of thefirst holder member 111 and thesurface 112A of thesecond holder member 112 face each other, the threadedholes 115 are aligned with their correspondingholes 114. Therefore, thefirst holder member 111 and thesecond holder member 112 may be fastened together bybolts 116 inserted through theholes 114 and screwed in threadedholes 115. Thus, fastening thefirst holder member 111 and thesecond holder member 112, thesecond holder 110, thepassage forming pipe 13, and thefirst holder 113 are fixed together. Though thefirst holder member 111 and thesecond holder member 112 are disposed one above the other inFIG. 10 , theholder members first holder member 111 and thesecond holder member 112 may be fastened with thebolts 116 oriented so that the heads of thebolts 116 make no interference with the surroundings of thesecond holder 110. Screwing out thebolts 116, thefirst holder member 111 and thesecond holder member 112 are separated away from each other, so that the brush can be removed by moving radially outwardly. Such a structure facilitates the replacement of the brush (not shown inFIG. 10 ) and prevents the brush from interfering with the surroundings. - In the first, second, and third embodiments, the main nozzle has been described as having one nozzle, but the main nozzle may be configured to have a plurality of nozzles. For example, it may be so configured that the main nozzle has a plurality of nozzles for warp yarns of two different colors or more and that one second holder is provided outside a nozzle body for each nozzle. In this case, with the brush interposed between the first holder and the passage forming pipe of each nozzle, the single second holder is fastened to the passage forming pipe and the first holder. In this configuration, each nozzle may not have its own second holders, so that the space occupied by the second holder can be reduced.
- In the first embodiment, in moving the
brush 37 for replacement, thesecond holder 35 is removed from thepassage forming pipe 13, thefirst holder 36 is removed from thesecond holder 35 and then thebrush 37 is removed from thesecond holder 35. However, the following procedure may be used for the removal of thebrush 37. With thesecond holder 35 mounted thepassage forming pipe 13, thefirst holder 36 is removed from thesecond holder 35 and then thebrush 37 is removed from thesecond holder 35 by blowing air againstbrush 37 from thepassage 31. In this case, the procedure for removing thebrush 37 is simplified. - A main nozzle of an air jet loom includes a nozzle body, a yarn inlet pipe mounted in the nozzle body to allow introduction of a weft yarn, a passage forming pipe cooperating with an outer peripheral surface of an end portion of the yarn inlet pipe to form a passage of compressed air, an accelerator pipe disposed downstream of the passage forming pipe to accelerate the weft yarn, a first holder holding the accelerator pipe, a brush disposed in a passage of the compressed air between the passage forming pipe and the first holder to catch the weft yarn flowing back from the accelerator pipe, and a second holder holding the brush and the first holder. The passage forming pipe has an end extending from the nozzle body, and the second holder is fixed to the end.
Claims (4)
- A main nozzle of an air jet loom, comprising:a nozzle body (11);a yarn inlet pipe (12) mounted in the nozzle body (11) to allow introduction of a weft yarn (Y);a passage forming pipe (13, 91) cooperating with an outer peripheral surface of an end portion (23) of the yarn inlet pipe (12) to form a passage (32) of compressed air;an accelerator pipe (14) disposed downstream of the passage forming pipe (13, 91) to accelerate the weft yarn (Y);a first holder (36, 67, 77, 92, 113) holding the accelerator pipe (14);a brush (37) disposed in a passage of the compressed air between the passage forming pipe (13) and the first holder (36, 67, 77, 92, 113) to catch the weft yarn (Y) flowing back from the accelerator pipe (14); anda second holder (35, 60, 71, 90, 110) holding the brush (37) and the first holder (36, 67, 77, 92, 113),characterized in thatthe passage forming pipe (13) has an end (34, 70) extending from the nozzle body (11), and the second holder (35, 60, 71, 90, 110) is fixed to the end (34, 70).
- The main nozzle of the air jet loom according to claim 1, characterized in that the brush (37) is held between the second holder (35, 60, 71, 90, 110) and the first holder (36, 67, 77, 92, 113).
- The main nozzle of the air jet loom according to claim 1 or 2, characterized in that the second holder (35, 60) has a first connecting hole (38, 62) to connect the passage forming pipe (13) and a second connecting hole (40, 64) to connect the first holder (36, 67), wherein a first internal thread (39, 63) formed on an inner peripheral surface of the first connecting hole (38, 62) and an external thread (43) formed on an outer peripheral surface of the passage forming pipe (13) are
engaged with each other, and wherein a second internal thread (41, 65) formed on an inner peripheral surface of the second connecting hole (40, 64) and an external thread (51, 68) formed on an outer peripheral surface of the first holder (36, 67) are engaged with each other. - The main nozzle of the air jet loom according to claim 3, characterized in that the outer peripheral surface of the passage forming pipe (13) and the inner peripheral surface of the first connecting hole (38, 62) are in contact with each other so that the passage forming pipe (13) and the second holder (35, 60) are coaxial with each other, wherein the outer peripheral surface of the first holder (36, 67) and the inner peripheral surface of the second connecting hole (40, 64) are in contact with each other so that the second holder (35, 60) and the first holder (36, 67) are coaxial with each other.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014233459A JP6137133B2 (en) | 2014-11-18 | 2014-11-18 | Main nozzle of air jet loom |
Publications (2)
Publication Number | Publication Date |
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EP3023525A1 true EP3023525A1 (en) | 2016-05-25 |
EP3023525B1 EP3023525B1 (en) | 2020-04-01 |
Family
ID=54366109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15192889.2A Active EP3023525B1 (en) | 2014-11-18 | 2015-11-04 | Main nozzle for air jet loom |
Country Status (3)
Country | Link |
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EP (1) | EP3023525B1 (en) |
JP (1) | JP6137133B2 (en) |
CN (1) | CN105603618B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3342910A1 (en) * | 2016-12-27 | 2018-07-04 | Kabushiki Kaisha Toyota Jidoshokki | Main nozzle for air jet loom |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6879061B2 (en) * | 2017-06-05 | 2021-06-02 | 株式会社豊田自動織機 | Air jet loom |
CN107475869A (en) * | 2017-07-22 | 2017-12-15 | 南通唐盛纺织有限公司 | The energy-saving main burner of used in jet loom |
Citations (4)
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JPS51124159U (en) * | 1975-03-20 | 1976-10-07 | ||
EP2226416A1 (en) * | 2009-03-06 | 2010-09-08 | Promatech S.p.A. | Launch nozzle with weft retaining means for a pneumatic weaving loom |
CN201826108U (en) * | 2010-10-11 | 2011-05-11 | 江阴市祥德纺织有限公司 | Auxiliary weft yarn shrinking prevention device of air jet loom |
EP2778268A1 (en) * | 2013-03-15 | 2014-09-17 | Kabushiki Kaisha Toyota Jidoshokki | Main nozzle of an air jet loom |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009007694A (en) * | 2007-06-27 | 2009-01-15 | Tsudakoma Corp | Weft-insertion nozzle and nozzle slip-out prevention member for weft used for weft-insertion nozzle |
CN202881561U (en) * | 2012-07-11 | 2013-04-17 | 江苏万工科技集团有限公司 | Main nozzle connecting and guiding spray pipe and double-spray main nozzle composed of the same |
CN203715837U (en) * | 2013-12-10 | 2014-07-16 | 苏州大学 | Main spray nozzle structure of air-jet loom |
-
2014
- 2014-11-18 JP JP2014233459A patent/JP6137133B2/en not_active Expired - Fee Related
-
2015
- 2015-11-04 EP EP15192889.2A patent/EP3023525B1/en active Active
- 2015-11-17 CN CN201510787687.2A patent/CN105603618B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51124159U (en) * | 1975-03-20 | 1976-10-07 | ||
EP2226416A1 (en) * | 2009-03-06 | 2010-09-08 | Promatech S.p.A. | Launch nozzle with weft retaining means for a pneumatic weaving loom |
CN201826108U (en) * | 2010-10-11 | 2011-05-11 | 江阴市祥德纺织有限公司 | Auxiliary weft yarn shrinking prevention device of air jet loom |
EP2778268A1 (en) * | 2013-03-15 | 2014-09-17 | Kabushiki Kaisha Toyota Jidoshokki | Main nozzle of an air jet loom |
JP2014177725A (en) | 2013-03-15 | 2014-09-25 | Toyota Industries Corp | Main nozzle of air jet loom |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3342910A1 (en) * | 2016-12-27 | 2018-07-04 | Kabushiki Kaisha Toyota Jidoshokki | Main nozzle for air jet loom |
Also Published As
Publication number | Publication date |
---|---|
CN105603618A (en) | 2016-05-25 |
CN105603618B (en) | 2017-12-08 |
JP6137133B2 (en) | 2017-05-31 |
EP3023525B1 (en) | 2020-04-01 |
JP2016098442A (en) | 2016-05-30 |
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