MAIN NOZZLE FOR AIR JET LOOM

Description

[0001] The present invention relates to a main nozzle for an air jet loom according to the preamble of claim 1.

[0002] 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. JP 2014-177725 A dicloses a main nozzle for an
air jet loom that prevents weft yarn from being moved out of the main nozzle. In the above Publication, the main nozzle for the air jet loom includes a nozzle body, a weft yarn inlet pipe mounted on the nozzle body, a pipe forming a passage for a flow of air, and an accelerator pipe of weft yarn. The accelerator pipe is disposed downstream of the passage forming pipe and a brush as a weft yarn catcher is interposed between the passage forming pipe and the weft accelerator pipe. The accelerator pipe is held by a first holder which is disposed downstream of the brush. A brush holder for holding the brush is disposed between a small-diameter portion of the passage forming pipe and the first holder. The small-diameter portion of the passage forming pipe, the brush holder, and the upstream end of the first holder are fitted in a second holder thereby to form an integral unit. Inserting the second holder into a hole formed in the nozzle body, the passage forming pipe, the brush, and the accelerator pipe that are integrated into one unit can be mounted into the nozzle body at a time.

[0003] 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.

[0004] In the above-described main nozzle for 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.

[0005] In the above-described main nozzle for 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.

[0006] EP 2 778 268 A1 shows a generic main nozzle for an air jet loom according to the preamble of claim 1. In particular, this main nozzle for an air jet loom comprises 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, wherein the passage forming pipe has an end.

[0007] EP 2 226 416 A1 a nozzle for an air jet loom comprising 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, and 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. The passage forming pipe has an end. A replaceable configuration of parts of said main nozzle constitution by means of using O-rings and clamps is further provided.

SUMMARY OF THE INVENTION

[0008] It is the object of the present invention to further develop a generic main nozzle for an air jet loom according to the preamble of claim 1 such that an improved and easy replacement of a brush is allowed.

[0009] The object of the present invention is achieved by a main nozzle for an air jet loom having the features of claim 1.

[0010] Further advantageous developments of the present invention are defined in the dependent claims

[0011] It is an advantage of the present invention to provide a main nozzle for an air jet loom, which allows easy replacement of the brush.

[0012] According to the subject-matter of the present invention as defined in claim 1, a main nozzle for an air jet loom is provided, by which the brush can easily be replaced, for example, without removing or demounting the whole main nozzle assembly from the air jet loom.

[0013] 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.

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The invention together with its features, effects and advantages, 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 longitudinal sectional view of a main nozzle for 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 of FIG. 1;

FIG. 3 is a sectional view taken along the line A-A of FIG. 2, showing schematically a brush of the main nozzle;

FIG. 4 is a perspective view of the brush of FIG. 3;

FIG. 5 is a fragmentary longitudinal sectional view of the main nozzle of FIG. 1, illustrating how a weft yarn is caught;

FIGS. 6A through 6C are schematic views illustrating a procedure for replacement of the brush of FIG. 5;

FIG. 7 is a fragmentary longitudinal sectional view showing a relevant part of a main nozzle for 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 for 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 for 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 for an air jet loom according to still another embodiment (alternative embodiment 2) of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

First embodiment

[0015] The following will describe a main nozzle for 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 of FIG. 1) and downstream (left side of FIG. 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 to FIGS. 1 to 3, the major parts of the main nozzle include a nozzle body 11, a yarn inlet pipe 12, an air passage forming pipe 13 all of which are fixed to the nozzle body 11, and an accelerator pipe 14 of weft yarn.

[0016] The nozzle body 11 has therethrough an axial hole 15 in which the yarn inlet pipe 12 is inserted. The nozzle body 11 also has therein a compressed air passage 16 that is connected to an air tank (not shown) through a pipe (not shown either). The hole 15 has a large-diameter hole portion 15A, a small-diameter hole portion 15B, and a stepped portion 15C. The large-diameter hole portion 15A is formed in the middle between the upstream side and the downstream side of the hole 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. The stepped portion 15C is formed between the large-diameter hole portion 15A and the small-diameter hole portion 15B. The hole 15 further has in a part thereof upstream of the large-diameter hole portion 15A an expanded hole portion 15D having in the inner peripheral surface thereof an internal thread 26. The yarn inlet pipe 12 is inserted in the hole 15. The yarn inlet pipe 12 has therethrough a longitudinal central yarn passage 17 and is provided with a yarn guide inlet 19 that is connected to the yarn inlet pipe 12 at the upstream end of the yarn passage 17. The yarn guide inlet 19 includes a guide member 18 made of a rigid material such as a ceramic and has a funneled opening.

[0017] The upstream end of the yarn inlet pipe 12 is formed as an expanded portion 12A that is formed greater in diameter than the other part of the yarn inlet pipe 12. The yarn inlet pipe 12 is formed smaller in diameter at the position thereof corresponding to the passage 16 so that a first annular chamber 20 is formed between the outer peripheral surface of the yarn inlet pipe 12 and the inner peripheral surface of the large-diameter hole portion 15A of the nozzle body 11. The yarn inlet pipe 12 is provided with a plurality of fins 21 that are equally spaced in the circumferential direction thereof at a positon downstream of the first annular chamber 20. With the yarn inlet pipe 12 inserted in place in the hole 15 of the nozzle body 11, the fins 21 are in contact at their tips with the inner peripheral surface of the large-diameter hole portion 15A of the nozzle body 11 so that a passage 22 in communication with the first annular chamber 20 is formed between any two adjacent fins 21. The yarn inlet pipe 12 has an end portion 23 that is tapered downward. The end portion 23 of the yarn inlet pipe 12 need not necessarily be tapered but may be extended straight and parallel to the inner peripheral surface of the nozzle body 11.

[0018] A second annular chamber 24 is formed downstream of the passages 22. The first annular chamber 20, the passages 22, and the second annular chamber 24 cooperate to form a compressed air passage between the inner peripheral surface of the large-diameter hole portion 15A of the nozzle body 11 and the outer peripheral surface of the yarn inlet pipe 12. The expanded portion 12A of the yarn inlet pipe 12 is formed with an external thread 25 that is engaged with an internal thread 26 formed in the expanded hole portion 15D of the hole 15 of the nozzle body 11 so that the end portion 23 of the yarn inlet pipe 12 is positioned appropriately in the nozzle body 11 by screwing the yarn inlet pope 12 into the hole 15 of the nozzle body 11. Tightening a lock nut 27 engaged with the external thread 25 of the expanded portion 12A, the yarn inlet pipe 12 is fixed to the nozzle body 11.

[0019] The passage forming pipe 13 is disposed in the hole 15 of the nozzle body 11 at a position downstream of the yarn inlet pipe 12. The passage 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 the nozzle 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 the nozzle body 11. The large-diameter portion 28 has therein a tapered inner peripheral surface 30 and the small-diameter portion 29 has therethrough a passage 31 extending downstream of the inner peripheral surface 30. The end portion 23 of the yarn inlet pipe 12 is inserted in a tapered hole formed by the tapered inner peripheral surface 30. The tapered inner peripheral surface 30 cooperates with the outer peripheral surface of the tapered end portion 23 of the yarn inlet pipe 12 to form therebetween a passage 32 through which compressed air flows. The passage forming pipe 13 is inserted in the hole 15 of the nozzle 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 stepped portion 33 between the large-diameter portion 28 and the small-diameter portion 29 is engaged with the stepped portion 15C of the hole 15. As a result, the passage forming pipe 13 is positioned correctly in the hole 15 in the axial direction of the main nozzle.

[0020] As shown in FIG. 1, the small-diameter portion 29 of the passage forming pipe 13 extends out from the nozzle body 11. The passage forming pipe 13 has at the end of the small-diameter portion 29 a front end 34 extending from the small-diameter portion 29. A second holder 35 is fixed on the front end 34 and provided with a first holder 36 holding the accelerator pipe 14. A brush 37 is disposed between the front end 34 of the passage forming pipe 13 and the first holder 36.

[0021] As shown in FIG. 2, the front end 34 of the passage forming pipe 13 has an outer diameter that is smaller than that of the small-diameter portion 29. The front end 34 is formed with an external thread 43 on the outer peripheral surface of the passage forming pipe 13. The second holder 35 has in the upstream end thereof a first connecting hole 38. The first connecting hole 38 includes a large-diameter hole portion 38A having a diameter that corresponds to the outer diameter of the small-diameter portion 29 of the passage 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 stepped portion 38C formed between the large-diameter hole portion 38A and the small-diameter hole portion 38B. The small-diameter hole portion 38B of the second holder 35 is formed with a first internal thread 39 on the inner peripheral surface of the small-diameter hole portion 38B. The first internal thread 39 is engaged with the external thread 43 of the front end 34 of the passage forming pipe 13. The first connecting hole 38 corresponds to a connecting hole for connecting the second holder 35 and the passage forming pipe 13.

[0022] The front end 34 of the passage forming pipe 13 is inserted in the first connecting hole 38 of the second holder 35 through screw engagement between the external thread 43 of the front end 34 and the first internal thread 39 of the small-diameter hole portion 38B of the first connecting hole 38. Thus, the front end 34 of the passage forming pipe 13 is fastened to the second holder 35. The stepped portion 55 between the small-diameter portion 29 and the front end 34 of the passage forming pipe 13 is engaged with the stepped portion 38C of the first connecting hole 38 of the second holder 35, thus the second holder 35 being positioned correctly with respect to the passage forming pipe 13. The outer peripheral surface of the small-diameter portion 29 of the passage forming pipe 13 and the inner peripheral surface of the small-diameter hole portion 38B of the second holder 35 are in contact with each other. Therefore, the passage forming pipe 13 and the second holder 35 are connected together coaxially by thread engagement between the front end 34 of the passage forming pipe 13 and the small-diameter hole portion 38B of the second holder 35 with the axis L1 of the passage forming pipe 13 set in alignment with the axis L2 of the first connecting hole 38 of the second holder 35 (shown in FIGS. 3 and 6). 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.

[0023] The second holder 35 has in the downstream end thereof a second connecting hole 40. The second connecting hole 40 includes a large-diameter hole portion 40A the inner diameter of which corresponds to the outer diameter of a cylindrical portion 49 of the first 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 stepped portion 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 second internal thread 41. The second connecting hole 40 corresponds to a connecting hole for connecting the second holder 35 and the first holder 36. The first connecting hole 38 and the second connecting hole 40 are formed coaxially, having the same central axis L2. The first connecting hole 38 and the second connecting hole 40 of the second holder 35 communicate with each other through a hole 42.

[0024] Referring to FIG. 4, the brush 37 includes a brush holder 44 and a number of filaments 45. The brush holder 44 includes a small-diameter portion 46 provided on the upstream side of the brush holder 44 and a large-diameter portion 47 provided downstream of the small-diameter portion 46 and a stepped portion 56 between the small-diameter portion 46 and the large-diameter portion 47. The brush holder 44 has therethrough at the axial center thereof a hole 48 through which air flows. The filaments 45 are mounted in the downstream end of the large-diameter portion 47 of the brush holder 44 and bonded thereto by means such as an adhesive. The filaments 45 are arranged along the circumference of the hole 48, and directed downstream. The circumferentially arranged filaments 45 as a whole are tapered downstream. Each of the filaments is made of a material such as resin, metal or animal hair.

[0025] As shown in FIGS. 2 and 3, the brush 37 is inserted in the second connecting hole 40 of the second holder 35. The positioning of the brush 37 is accomplished by engagement of the small-diameter portion 46 of the brush holder 44 with the small-diameter hole portion 40B of the second connecting hole 40 and engagement of the large-diameter portion 47 of the brush holder 44 with the large-diameter hole portion 40A of the second connecting hole 40. The first holder 36 is disposed downstream of the brush 37 to hold the accelerator pipe 14. The first holder 36 includes a cylindrical portion 49 and a flange portion 50 that is provided at the downstream end of the cylindrical portion 49. The cylindrical portion 49 has on the outer peripheral surface thereof adjacent to the flange portion 50 an external thread 51 that is engaged with the second internal thread 41 of the second holder 35. The first holder 36 has a hole 52. A part of the upstream end of the accelerator pipe 14 is inserted in the hole 52 and bonded by an adhesive, so that the accelerator pipe 14 and the first holder 36 are integrated. The accelerator pipe 14 has therein a passage 53. The first holder 36 has at the upstream end portion thereof a passage 54 that extends downstream of the first holder 36 and has a funneled inner peripheral surface. The downstream end of the passage 54 is smoothly connected to the upstream end of the passage 53 of the accelerator pipe 14 because no stepped portion is formed between the passages 54, 53.

[0026] The cylindrical portion 49 of the first holder 36 is inserted in the second connecting hole 40 of the second holder 35. Tightening the external thread 51 of the cylindrical portion 49 with the second internal thread 41 of the second connecting hole 40, the first holder 36 is screwed into the second holder 35 for fastening. Then, the upstream end surface of the cylindrical portion 49 is in contact with the downstream end surface of the large-diameter portion 47 of the brush 37, so that the brush 37 is positioned correctly in the axial direction thereof. The filaments 45 of the brush 37 are arranged along the inner peripheral surface of the tapered passage 54 of the first holder 36. Thus, the circular space formed by the tip ends of the filaments 45 has substantially the same diameter as the inner diameters of the hole 48 and the passage 53 of the accelerator pipe 14 (shown in FIG. 3). It is noted that the hole 48 and the passage 53 have substantially the same inner diameter.

[0027] The brush 37 is disposed in a part of the compressed air passage between the passage forming pipe 13 and the accelerator pipe 14 held by the first holder 36 and serves as a weft yarn catcher. As shown in FIG. 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 the filaments 45 of the brush 37. The brush 37 is interposed between the stepped portion between the hole 42 and the small-diameter hole portion 40B of the second holder 35 and the upstream end of the first holder 36. The passage 31 of the passage forming pipe 13 and the hole 48 of the brush 37 communicate with each other through the hole 42 that is formed in the second holder 35. It is noted that the passage 31, the hole 42, and the hole 48 have substantially the same inner diameter.

[0028] The following will describe the procedure for replacing the brush 37 with reference to FIGS. 6A, 6B and 6C. For removing the brush 37, rotating the second holder 35, the engagement of the external thread 43 of the front end 34 of the passage forming pipe 13 and the first internal thread 39 of the small-diameter hole portion 38B of the second holder 35 is released and the second holder 35 is removed from the passage forming pipe 13, as shown in FIG. 6A.

[0029] Next, rotating the first holder 36, the second internal thread 41 of the second connecting hole 40 of the second holder 35 and the external thread 51 of the cylindrical portion 49 of the first holder 36 are disengaged and the first holder 36 is removed from the second holder 35 as shown in FIG. 6B. Since the accelerator pipe 14 and the first holder 36 are integrated, the accelerator pipe 14 and the first holder 36 are removed as a unit.

[0030] Next, as shown in FIG. 6C, the second holder 35 and the brush 37 are disengaged and the brush 37 is removed from the second holder 35.

[0031] A new brush 37 is mounted by the following procedure that is reverse to the removing of the brush 37. The brush holder 44 having new brush 37 is mounted In the second connecting hole 40 of the second holder 35. The first holder 36 integrated with the accelerator pipe 14 is inserted into the second connecting hole 40 of the second holder 35. The first holder 36 is screwed into the second holder 35 to be fastened thereto. The second holder 35 is mounted on the front end 34 of the passage forming pipe 13. The second holder 35 is screwed and fastened to the passage forming pipe 13.

[0032] The following will describe the operation of the above-described main nozzle for 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 first annular chamber 20 in response to the operation of an air valve (not shown). The compressed air smoothed by passage 22 and flowing through the second annular chamber 24 is injected into the passage 31 from the restricted passage 32. A weft yarn Y introduced into the yarn passage 17 of the yarn inlet pipe 12 and present between the passage 31 and the passage 53 and extending into the passage 53 is inserted by air injected through the passage 32.

[0033] Since the filaments 45 of the brush 37 are disposed in the passage 54 having a larger diameter than the yarn passage 17 of the yarn inlet pipe 12 and the space surrounded by the downstream ends of the filaments 45 of the brush 37 has substantially the same diameter as the passage 53 of the accelerator pipe 14, air injected from the passage 32 is less affected by the filaments 45 of the brush 37 as compared to the case of the above-cited background art, flowing smoothly through the passage 31, the hole 42, the hole 48, and the passage 53, so that the weft yarn Y is moved properly. Passing through the passage 53, the weft yarn Y is directed from the accelerator pipe 14 and then inserted into a warp shed (not shown).

[0034] 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 the accelerator pipe 14. As shown in FIG. 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 the passage 53 of the accelerator pipe 14. The weft yarn Y having passed through the accelerator pipe 14 and shrunk at a position where the brush 37 is disposed is caught successfully by the filaments 45 of the brush 37. Such shrinkage movement of the weft yarn Y is stopped by the filaments 45, so that the leading end of the weft yarn Y remains the passage 53 of the accelerator pipe 14.

[0035] 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 the filaments 45 of the brush 37 and present in the passage 53, so that weft insertion is performed properly. On the other hand, repeated friction of the filaments 45 of the brush 37 and the weft yarn Y causes wear to the filaments 45 of the brush 37. Though each filament 45 of the brush 37 has a tapered end, repeated friction of the filaments 45 of the brush 37 and the weft yarn Y widens the tapered ends of the filaments 45. Abrasion and deformation of the filaments 45 may prevent the weft yarn Y from being caught securely. The widened ends of the filaments 45 may prevent smooth flow of injection air in the passage 31. Thus, the brush 37 needs to be replaced periodically with a new one.

[0036] In the main nozzle of the present embodiment wherein the brush 37 is disposed in the second holder 35 and held between the second holder 35 and the first holder 36, replacement of the brush 37 may be accomplished by loosening off the second holder 35 from the passage forming pipe 13. The use of thread engagement for fastening a fastener facilitates removing the second holder 35 from the passage forming pipe 13.

[0037] Next, the first holder 36 is loosened off from the second holder 35. Then, the first holder 36 is removed from the second holder 35. Such a threaded fastener facilitates removing the first holder 36 from the second holder 35.

[0038] Next, the brush holder 44 of the brush 37 is unfastened from the small-diameter hole portion 40B of the second connecting hole 40 of the second holder 35. Then, the brush 37 is removed from the second holder 35. The brush holder 44 of the brush 37 that is engaged with the second connecting hole 40 of the second holder 35 may be removed easily from the second holder 35 by applying force in the axial direction.

[0039] Thus, removal of the brush 37 is easily accomplished by removing the second holder 35 from the passage forming pipe 13, removing the first holder 36 from the second holder 35, and removing the brush 37 from the second holder 35. Installation of a new brush 37 is accomplished by the procedure that is reverse to the removal of the brush 37. That is, replacing the brush 37 with a new one is implemented by performing three steps, which facilitates replacing and mounting of the brush 37 and shortens working time.

[0040] With the passage forming pipe 13 screwed in the second holder 35, the outer peripheral surface of the small-diameter portion 29 of the passage forming pipe 13 and the inner peripheral surface of the large-diameter hole portion 38A of the second holder 35 are in contact with each other so that allow the passage forming pipe 13 and the second holder 35 to be connected coaxially. That is, with the external thread 43 formed on the outer peripheral surface of the front end 34 of the passage forming pipe 13 and the first internal thread 39 formed on an inner peripheral surface of the small-diameter hole portion 38B of the second holder 35 engaged with each other, the central axis L1 of the passage forming pipe 13 corresponds to the central axis L2 of the second holder 35 and the passage forming pipe 13 and the second holder 35 are connected coaxially. As compared with the prior art main nozzle, the second 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 the passage forming pipe 13. The first connecting hole 38 and the second connecting hole 40 are formed coaxially in the second holder 35, having the same central axis L2. The first holder 36 that is fastened to the inner peripheral surface of the second connecting hole 40 and the accelerator pipe 14 that is integrated with the first holder 36 are assembled coaxially with the passage forming pipe 13 that is fastened to the inner peripheral surface of the first connecting hole 38. The first holder 36, the accelerator pipe 14, and the first connecting hole 38 have the same central axis.

[0041] The passage forming pipe 13, the second holder 35, and the first holder 36 are connected coaxially, so that the passage 31 of the passage forming pipe 13, the hole 42 formed in the second holder 35, the hole 48 of the brush 37, and the passage 53 of the accelerator 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.

[0042] The main nozzle according to the first embodiment offers the following advantageous effects.

(1) The second holder 35 is fixed to the front end 34 of the passage forming pipe 13 extending from the nozzle body 11. In replacing the brush 37, the second holder 35 is removed from the passage forming pipe 13 by disengagement of the external thread 43 of the outer periphery of the front end 34 of the passage forming pipe 13 and the first internal thread 39 of the first connecting hole 38 of the second holder 35. Next, the first holder 36 is removed from the second holder 35 by disengagement of the second internal thread 41 of the second connecting hole 40 of the second holder 35 and the external thread 51 of the cylindrical portion 49 of the first holder 36. Finally, the brush 37 is removed from the second holder 35 by disengagement of the brush holder 44 from the second connecting hole 40 of the second holder 35. Replacement of a new brush 37 is performed in a procedure reverse to the above. Thus, the replacement of the brush 37 may be performed easily and in a shortened time.

(2) With the passage forming pipe 13 screwed in the second holder 35, the outer peripheral surface of the small-diameter portion 29 of the passage forming pipe 13 and the inner peripheral surface of the large-diameter hole portion 38A of the second holder 35 are in contact with each other so that allows the passage forming pipe 13 and the second holder 35 to be connected coaxially with each other. That is, with the external thread 43 of the front end 34 of the passage forming pipe 13 and the first internal thread 39 of the small-diameter hole portion 38B of the second holder 35 engaged with each other, the central axis L1 of the passage forming pipe 13 corresponds to the central axis L2 of the second holder 35 and the passage forming pipe 13 and the second holder 35 are connected coaxially. Accordingly, the passage 31 of the passage forming pipe 13, the hole 42 formed in the second holder 35, the hole 48 of the brush 37, and the passage 53 of the accelerator 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 the nozzle body 11, the second holder 35 that receives no dimensional restriction from the nozzle body 11 may be made large as required. Therefore, machining of the first internal thread 39 and the second internal thread 41 may be made easily after drilling the first connecting hole 38 and the second connecting hole 40, respectively.

(4) Since the second holder 35 is disposed outside the nozzle body 11, the outer peripheral surface of the second holder 35 dispenses with high precision machining. Therefore, productivity in machining of the second holder 35 is improved.

(5) In the main nozzle of the present embodiment wherein the brush 37 is interposed between the second holder 35 and the first holder 36, removing the first holder 36 from the second holder 35 allows the brush 37 to be disengaged from axial restriction in the second holder 35. Therefore, the brush 37 can be removed from the second holder 35 without removing the second holder 35 from the passage forming pipe 13, so that brush replacement becomes easy.

Second embodiment

[0043] 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.

[0044] As shown in FIG. 7, an annular recess 61 is formed in the front end 34 of the passage forming pipe 13 so as to surround the passage 31 of the passage forming pipe 13. A first connecting hole 62 is formed in the upstream end of the second holder 60. The first connecting hole 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 the passage 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 connecting hole 62 has therein a stepped portion 62D formed between the large-diameter hole portion 62A and the medium-diameter hole portion 62B and a stepped portion 62E formed between the medium-diameter hole portion 62B and the small-diameter hole portion 62C. Thus, the first connecting hole 62 has three different hole portions and two different stepped portions. A first internal thread 63 is formed on the inner peripheral surface of the medium-diameter hole portion 62B engaged with the external thread 43 at the front end 34 of the passage forming pipe 13. The first connecting hole 62 corresponds to a connecting hole for connecting the second holder 60 and the passage forming pipe 13. The brush holder 44 of the brush 37 is fitted at the large-diameter portion 47 thereof in the small-diameter hole portion 62C of the first connecting hole 62.

[0045] A second connecting hole 64 is formed in the downstream end of the second holder 60. The second connecting hole 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 the first 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 connecting hole 64 has a stepped portion 64C formed between the large-diameter hole portion 64A and the small-diameter hole portion 64B. A second internal thread 65 is formed on the inner peripheral surface of the small-diameter hole portion 64B. The second connecting hole 64 corresponds to a connecting hole for connecting the second holder 60 and the first holder 67. The first connecting hole 62 and the second connecting hole 64 are formed coaxially, having the same central axis. The first connecting hole 62 and the second connecting hole 64 of the second holder 60 communicate with each other through a tapered hole 66. The hole 66 is tapered downstream of the second holder 60, having a funneled inner peripheral surface.

[0046] The brush 37 is inserted into the first connecting hole 62 of the second holder 60 with the large-diameter portion 47 of the brush holder 44 fitted in the small-diameter hole portion 62C of the first connecting hole 62. Then, the tips of the filaments 45 of the brush 37 are arranged along the inner peripheral surface of the hole 66 of the second holder 60. Next, the front end 34 of the passage forming pipe 13 is inserted into the first connecting hole 62 of the second holder 60. The external thread 43 of the front end 34 is engaged with the first internal thread 63 of the medium-diameter hole portion 62B of the first connecting hole 62. Thus, the front end 34 of the passage forming pipe 13 is fastened to the second holder 60. Then, the small-diameter portion 46 of the brush holder 44 of the brush 37 is fitted in the recess 61 of the passage forming pipe 13. Allowing the downstream end surface of the front end 34 of the passage forming pipe 13 to be engaged with the stepped portion 62E of the first connecting hole 62, with the stepped portion 56 between the large-diameter portion 47 and the small-diameter portion 46 of the brush holder 44, the second holder 60 and the brush 37 are positioned correctly at a time.

[0047] The first holder 67 for holding the accelerator pipe 14 is disposed downstream of the brush 37. The first 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 a flange portion 67C formed downstream of the large-diameter portion 67A. The small-diameter portion 67B has on the outer peripheral surface thereof an external thread 68 for engagement with the second internal thread 65. The first holder 67 has axially therethrough a hole 69. The upstream end of the accelerator pipe 14 is inserted in the hole 69. The accelerator pipe 14 and the first holder 67 are bonded together of an adhesive.

[0048] The large-diameter portion 67A and the small-diameter portion 67B of the first holder 67 are inserted in the second connecting hole 64 of the second holder 60. The first holder 67 may be fastened to the second holder 60 by engagement of the external thread 68 of the small-diameter portion 67B with the second internal thread 65 of the small-diameter hole portion 64B of the second connecting hole 64. The first holder 67 and the second holder 60 may be fastened together by screwing the first holder 67 into the second holder 60. Then, the upstream end surface of the small-diameter portion 67B of the first holder 67 is in contact with the bottom surface of the small-diameter hole portion 64B of the second connecting hole 64, or with the stepped portion between the hole 66 and the small-diameter hole portion 64B, so that the first holder 67 is positioned correctly in the axial direction thereof.

[0049] Thus, according to the main nozzle of the second embodiment, the brush 37 is disposed inside the second holder 60 and held between the passage forming pipe 13 and the second holder 60. In the replacement of the brush 37, the engagement of the external thread 43 of the outer periphery of the front end 34 of the passage forming pipe 13 and the first internal thread 63 on the inner periphery of the first connecting hole 62 of the second holder 60 is loosened off from the passage forming pipe 13. Next, disengaging the brush holder 44 from the small-diameter hole portion 62C of the first connecting hole 62, the brush 37 is removed from the second holder 60. Since the brush 37 is held between the small-diameter portion 29 of the passage forming pipe 13 and the second holder 60, the brush 37 is prevented from falling in removing the first holder 67 from the second holder 60 for replacement of the accelerator pipe 14.

Third embodiment

[0050] 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 the first 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.

[0051] As shown in FIG. 8, a front end 70 of the passage forming pipe 13 is smaller in outer diameter than the small-diameter portion 29. Unlike the first embodiment, the front end 70 has no external thread. A first connecting hole 72 is formed in the upstream end of the second holder 71. The first connecting hole 72 of the second 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 the passage forming pipe 13 and a small-diameter portion 72B the inner diameter of that corresponds to the outer diameter of the front end 70 of the passage 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 the front end 70 of the passage forming pipe 13, and a stepped portion 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 connecting hole 72 corresponds to a connecting hole for connecting the second holder 71 and the passage forming pipe 13. A plurality of threaded holes 73 is formed through the peripheral wall of the second holder 71 at positions adjacent to the opposite ends of the second holder 71 and spaced circumferentially at an interval.

[0052] The front end 70 of the passage forming pipe 13 is inserted into the first connecting hole 72 of the second holder 71 so that the front end 70 is engaged with the small-diameter portion 72B of the first connecting hole 72 and the end portion of the small-diameter portion 29 is engaged with the large-diameter portion 72A of the first connecting hole 72. With the stepped portion between the small-diameter portion 29 of the passage forming pipe 13 and the front end 70 engaged in contact with the stepped portion 72C of the first connecting hole 72, the second holder 71 is positioned correctly with respect to the passage forming pipe 13. Next, screwing the set screws 74 into the respective threaded holes 73 of the second holder 71, the second holder 71 is fixed to the passage forming pipe 13 and the first holder 77, so that the passage forming pipe 13 is prevented from being pulled out from the first connecting hole 72 of the second holder 71.

[0053] The second holder 71 has therein a second connecting hole 75. The second connecting hole 75 includes a large-diameter hole portion 75A that corresponds to the cylindrical portion 78 of the first 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 connecting hole 75 corresponds to a connecting hole for connecting the second holder 71 and the first holder 77. The first connecting hole 72 and the second connecting hole 75 are formed coaxially, having the same central axis. The first connecting hole 72 and the second connecting hole 75 of the second holder 35 communicate with each other through the hole 76.

[0054] The brush 37 is inserted into the second connecting hole 75 of the second holder 71 with the small-diameter portion 46 of the brush holder 44 fitted in the small-diameter hole portion 75B of the second connecting hole 75 and the large-diameter portion 47 of the brush holder 44 fitted in the large-diameter hole portion 75A of the second connecting hole 75, respectively. The first holder 77 is disposed downstream of the brush 37 and holds the accelerator pipe 14. The first holder 77 has the cylindrical portion 78 and a flange portion 79 formed downstream of the cylindrical portion 78. Unlike the first embodiment, the cylindrical portion 78 ha no external thread. The first holder 77 has therethrough a hole 80. The upstream end of the accelerator pipe 14 is inserted in the hole 80. The accelerator pipe 14 and the first holder 77 are bonded together by an adhesive. The first holder 77 has therein at the upstream end portion thereof a passage 81 that is tapered downstream of the first holder 77 and has a funneled inner peripheral surface. The downstream end of the tapered passage 81 is smoothly connected to the upstream end of the passage 53 of the accelerator pipe 14.

[0055] The cylindrical portion 78 of the first holder 77 is inserted into the second connecting hole 75 of the second holder 71 and engaged with the large-diameter hole portion 75A of the second connecting hole 75. Then, the upstream end surface of the cylindrical portion 78 is in contact with the downstream end surface of the large-diameter portion 47 of the brush holder 44 of the brush 37, so that the brush 37 is positioned correctly in the axial direction thereof. The tips of the filaments 45 of the brush 37 are arranged along the inner peripheral surface of the passage 81 of the first holder 77. Thus, like the first embodiment, the circular space formed by the tip ends of the filaments 45 has substantially the same diameter as the hole 48 and the passage 53 of the accelerator pipe 14. Next, screwing the set screws 74 into the respective threaded holes 73, the first holder 77 and the second holder 71 are fixed together and the first holder 77 is prevented from being pulled out from the second connecting hole 75 of the second holder 71.

[0056] The following will describe a procedure for replacing the brush 37. First, loosening the set screws 74, the second holder 71 is removed from the passage forming pipe 13 and the first holder 77 is removed from the second holder 71, respectively. Finally, the brush 37 is removed from the second holder 71.

[0057] Thus, in the main nozzle according to the third embodiment, the threaded holes 73 may be formed at any desired positions of the second holder 71 in the circumferential direction thereof so that no interference occurs between the head portion of the set screw 74 and any part provided adjacent to the main nozzle. The use of the set screw 74 for connecting the second holder 71 to the passage forming pipe 13 and the first holder 77 dispenses with machining for forming thread in the second holder 71, the passage forming pipe 13 and the first holder 77 and, therefore, the manufacturing of the main nozzle is facilitated and the procedure of brush replacement is simplified. Furthermore, the set screw 74 and the threaded hole 73 may be so configured that no part of the set screw 74 extends out from the threaded hole 73 mounted In the second holder 71 so that the head portion of the set screw 74 does not extend outside of the outer peripheral surface of the second holder 71. By so configuring, the space around the second holder 71 can be utilized effectively.

[0058] 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 as defined in the appended claims. Referring to FIG. 9, showing an alternative embodiment 1 of the present invention, a second holder 90, a passage forming pipe 91, and a first 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 to FIG.9, the second holder 90 has at the upstream end thereof a flange portion 93 and at the downstream end thereof a flange portion 94. The second holder 90 further has therein a first connecting hole 95 extending in downstream portion thereof and a second connecting hole 96 extending in upstream portion thereof, A plurality of threaded holes 93A is formed through the flange portion 93 and spaced at an interval in the circumferential direction of the flange portion 93. A plurality of threaded holes 94A is formed through the flange portion 94 and spaced at an interval in the circumferential direction of the flange portion 94. The passage 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 a flange portion 98 that is to be in contact with the flange portion 93 of the second holder 90. The flange portion 98 has therefthrough a plurality of holes 98A that are spaced at such an interval in the circumferential direction of the flange portion 98 that the holes 98A correspond to the respective threaded holes 93A formed through the flange portion 93. The front end of the small-diameter portion 97 of the passage forming pipe 91 is inserted into the first connecting hole 95 of the second holder 90 and so that the flange portion 98 is in contact with the flange portion 93. With the holes 98A and their corresponding threaded holes 93A aligned coaxially, the bolts 99 are inserted through the holes 98A, as shown in FIG. 9, and tightened into the corresponding threaded holes 93A, thereby fastening the passage forming pipe 91 and the second holder 90 together. By so fastening, the second holder 90 is positioned correctly with respect to the passage forming pipe 91. The first holder 92 includes a cylindrical portion 100 and a flange portion 101 that is disposed at the downstream end of the cylindrical portion 100 and in contact with the flange portion 94. The flange portion 101 has therethrough a plurality of holes 101A that are spaced at such an interval in the circumferential direction of the flange portion 101 that the holes 101A correspond to the respective threaded hole 94A formed through the flange portion 94. With the second connecting hole 96 of the second holder 90 engaged with the brush 37, the cylindrical portion 100 of the first holder 92 is inserted into the second connecting hole 96 so that the flange portion 101 is in contact with the flange portion 94 of the second holder 90. With the holes 101A and their corresponding threaded holes 94A aligned coaxially, the bolts 99 are inserted through the holes 101A, as shown in FIG. 9, and tightened into the corresponding threaded holes 94A, thereby fastening the first holder 92 and the second holder 90 together. The first holder 92 is positioned correctly with respect to the second holder 90. In this case, the second holder 90 and the passage forming pipe 91 are fastened by the bolts 99 with the flange portions 93, 98 being in contact with each other. The second holder 90 and the first holder 92 are fastened by the bolts 99 with the flange portions 94, 101 pressed in contact with each other. Therefore, unscrewing the bolts 99 allows the passage forming pipe 91 and the first holder 92 to be removed from the second holder 90. Thus, the replacement of the brush 37 may be performed easily. Furthermore, the disposition of the bolts 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.

[0059] Referring to FIG. 10, showing an alternative embodiment 2, the second holder 110 is of a split type that includes a first holder member 111 and a second holder member 112 each having a half cylinder shape. Though not shown in the drawing, the second holder 110 has therein on the upstream side thereof the front end of the passage forming pipe 13 and the first holder 113 integrating the brush 37 and the accelerator pipe 14. The first and second holder members 111 and 112 have a pair of surfaces 111A and 112A that face each other when the first and second holder members 111, 112 are assembled together. The first holder member 111 has therethrough a plurality of holes 114 each having an opening at the surface 111A and an opening at the outer cylindrical surface thereof. The second holder member 112 has therein a plurality of threaded holes 115. The threaded holes 115 are formed in such a way that, with the surface 111A of the first holder member 111 and the surface 112A of the second holder member 112 face each other, the threaded holes 115 are aligned with their corresponding holes 114. Therefore, the first holder member 111 and the second holder member 112 may be fastened together by bolts 116 inserted through the holes 114 and screwed in threaded holes 115. Thus, fastening the first holder member 111 and the second holder member 112, the second holder 110, the passage forming pipe 13, and the first holder 113 are fixed together. Though the first holder member 111 and the second holder member 112 are disposed one above the other in FIG. 10, the holder members 111, 112 may be disposed otherwise. Accordingly, since the first holder member 111 and the second holder member 112 may be fastened with the bolts 116 oriented so that the heads of the bolts 116 make no interference with the surroundings of the second holder 110. Screwing out the bolts 116, the first holder member 111 and the second 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 in FIG. 10) and prevents the brush from interfering with the surroundings.

[0060] 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.

[0061] In the first embodiment, in moving the brush 37 for replacement, the second holder 35 is removed from the passage forming pipe 13, the first holder 36 is removed from the second holder 35 and then the brush 37 is removed from the second holder 35. However, the following procedure may be used for the removal of the brush 37. With the second holder 35 mounted the passage forming pipe 13, the first holder 36 is removed from the second holder 35 and then the brush 37 is removed from the second holder 35 by blowing air against brush 37 from the passage 31. In this case, the procedure for removing the brush 37 is simplified.

Claims

1. A main nozzle for 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); and

a second holder (35, 60, 71, 90, 110) holding the brush (37) and the first holder (36, 67, 77, 92, 113); wherein

the passage forming pipe (13) has an end (34, 70),

characterized in that

the end (34, 70) extends from the nozzle body (11),

the second holder (35, 60, 71, 90, 110) is replaceably fixed to the end (34, 70), and

the first holder (36, 67, 77, 92, 113) is replaceably fixed to the second holder (35, 60, 71, 90, 110).

2. The main nozzle for an 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).

3. The main nozzle for an 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.

4. The main nozzle for an 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.

Ansprüche

1. Hauptdüse für eine Luftdüsenwebmaschine, die Folgendes aufweist:

einen Düsenkörper (11);

ein Garneinlassrohr (12), das in dem Düsenkörper (11) montiert ist, um eine Einführung eines Schussgarns (Y) zu ermöglichen;

ein Durchgangsausbildungsrohr (13, 91), das mit einer Außenumfangsfläche eines Endabschnitts (23) des Garneinlassrohrs (12) zusammenwirkt, um einen Durchgang (32) für eine verdichtete Luft auszubilden;

ein Beschleunigerrohr (14), das stromabwärtig des Durchgangsausbildungsrohrs (13, 91) angeordnet ist, um den Schussgarn (Y) zu beschleunigen;

eine erste Halterung (36, 67, 77, 92, 113), die das Beschleunigerrohr (14) hält;

eine Bürste (37), die in einem Durchgang der verdichteten Luft zwischen dem Durchgangsausbildungsrohr (13) und der ersten Halterung (36, 67, 77, 92, 113) angeordnet ist, um den Schussgarn (Y), der von dem Beschleunigerrohr (14) zurückströmt, einzufangen; und

eine zweite Halterung (35, 60, 71, 90, 110), die die Bürste (37) und die erste Halterung (36, 67, 77, 92, 113) hält; wobei

das Durchgangsausbildungsrohr (13) ein Ende (34, 70) hat,

dadurch gekennzeichnet, dass

sich das Ende (34, 70) von dem Düsenkörper (11) erstreckt,

die zweite Halterung (35, 60, 71, 90, 110) an dem Ende (34, 70) auswechselbar befestigt ist, und

die erste Halterung (36, 37, 77, 92, 113) an der zweiten Halterung (35, 60, 71, 90, 110) auswechselbar befestigt ist.

2. Hauptdüse für eine Luftdüsenwebmaschine nach Anspruch 1, dadurch gekennzeichnet, dass die Bürste (37) zwischen der zweiten Halterung (35, 60, 71, 90, 110) und der ersten Halterung (36, 67, 77, 92, 113) gehalten wird.

3. Hauptdüse für eine Luftdüsenwebmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die zweite Halterung (35, 60) ein erstes Verbindungsloch (38, 62) zum Verbinden des Durchgangsausbildungsrohrs (13) und ein zweites Verbindungsloch (40, 64) zum Verbinden der ersten Halterung (36, 67) hat, wobei ein erstes Innengewinde (39, 63), das an einer Innenumfangsfläche des ersten Verbindungslochs (38, 62) ausgebildet ist, und ein Außengewinde (43), das an einer Außenumfangsfläche des Durchgangsausbildungsrohrs (13) ausgebildet ist, miteinander in Eingriff sind, und wobei ein zweites Innengewinde (41, 65), das an einer Innenumfangsfläche des zweiten Verbindungslochs (40, 64) ausgebildet ist, und ein Außengewinde (51, 68), das an einer Außenumfangsfläche der ersten Halterung (36, 67) ausgebildet ist, miteinander in Eingriff sind.

4. Hauptdüse für eine Luftdüsenwebmaschine nach Anspruch 3, dadurch gekennzeichnet, dass die Außenumfangsfläche des Durchgangsausbildungsrohrs (13) und die Innenumfangsfläche des ersten Verbindungslochs (38, 62) miteinander so in Kontakt sind, dass das Durchgangsausbildungsrohr (13) und die zweite Halterung (35, 60) koaxial zueinander sind, wobei die Außenumfangsfläche der ersten Halterung (36, 67) und die Innenumfangsfläche des zweiten Verbindungslochs (40, 64) miteinander so in Kontakt sind, dass die zweite Halterung (35, 60) und die erste Halterung (36, 67) zueinander koaxial sind.

Revendications

1. Buse principale pour un métier à tisser du type à jet d'air, comprenant :

un corps de buse (11) ;

un tuyau d'entrée de fil (12) monté dans le corps de buse (11) pour permettre l'introduction d'un fil de trame (Y) ;

un tuyau formant un passage (13, 91) coopérant avec une surface périphérique externe d'une portion terminale (23) du tuyau d'entrée de fil (12) dans le but de former un passage (32) pour l'air comprimé ;

un tuyau d'accélération (14) disposé en aval du tuyau formant un passage (13, 91) destiné à l'accélération du fil de trame (Y) ;

un premier dispositif de maintien (36, 67, 77, 92, 113) qui maintient le tuyau d'accélération (14) ;

une brosse (37) disposée dans un passage pour l'air comprimé entre le tuyau formant un passage (13) et le premier dispositif de maintien (36, 67, 77, 92, 113), destinée à saisir le fil de trame (Y) qui circule en retour à partir du tuyau d'accélération (14) ; et

un second dispositif de maintien (35, 60, 71, 90, 110) qui maintient la brosse (37) et le premier dispositif de maintien (36, 67, 77, 92, 113) ; dans laquelle le tuyau formant un passage (13) possède une extrémité (34, 70) ;

caractérisée en ce que

l'extrémité (34, 70) s'étend à partir du corps de buse (11) ;

le second dispositif de maintien (35, 60, 71, 90, 110) est fixé de manière amovible à l'extrémité (34, 70) ; et

le premier dispositif de maintien (36, 67, 77, 92, 113) est fixé de manière amovible au second dispositif de maintien (35, 60, 71, 90, 110).

2. Buse principale pour un métier à tisser du type à jet d'air selon la revendication 1, caractérisée en ce que la brosse (37) est maintenue entre le second dispositif de maintien (35, 60, 71, 90, 110) et le premier dispositif de maintien (36, 67, 77, 92, 113).

3. Buse principale pour un métier à tisser du type à jet d'air selon la revendication 1 ou 2, caractérisée en ce que le second dispositif de maintien (35, 60) possède un premier trou de connexion (38, 62) destiné à établir une connexion avec le tuyau formant un passage (13) et un second trou de connexion (40, 64) destiné à établir une connexion avec le premier dispositif de maintien (36, 67) ; dans laquelle un premier filet de vis interne (39, 63) formé sur une surface périphérique interne du premier trou de connexion (38, 62) et un filet de vis externe (43) formé sur une surface périphérique externe du tuyau formant un passage (13) sont engrenés l'un avec l'autre ; et dans laquelle un second filet de vis interne (41, 65) formé sur une surface périphérique interne du second trou de connexion (40, 64) et un filet de vis externe (51, 68) formé sur une surface périphérique externe du premier dispositif de maintien (36, 67) sont engrenés l'un avec l'autre.

4. Buse principale pour un métier à tisser du type à jet d'air selon la revendication 3, caractérisée en ce que la surface périphérique externe du tuyau formant un passage (13) et la surface périphérique interne du premier trou de connexion (38, 62) sont mises en contact l'une avec l'autre d'une manière telle que le tuyau formant un passage (13) et le second dispositif de maintien (35, 60) sont disposés en position coaxiale l'un par rapport à l'autre ; dans laquelle la surface périphérique externe du premier dispositif de maintien (36, 67) et la surface périphérique interne du second trou de connexion (40, 64) sont mises en contact l'une avec l'autre d'une manière telle que le second dispositif de maintien (35, 60) et le premier dispositif de maintien (36, 67) sont disposés en position coaxiale l'un par rapport à l'autre.

Drawing