EP3342910A1

EP3342910A1 - Main nozzle for air jet loom

Info

Publication number: EP3342910A1
Application number: EP17204394.5A
Authority: EP
Inventors: Akito Morita; Yoichi Makino
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2016-12-27
Filing date: 2017-11-29
Publication date: 2018-07-04
Also published as: JP2018104857A; CN108239817A

Abstract

A main nozzle (11) for an air jet loom includes a nozzle body (12), a yarn inlet pipe (13) mounted to the nozzle body (12), a first holder (14), a yarn accelerator pipe (15) supported by the nozzle body (12) through the first holder (14), a brush (16) between the yarn inlet pipe (13) and the first holder (14), and a second holder (17) cooperating with the first holder (14) to hold the brush (16). The first holder (14) is at least partly accommodated in the nozzle body (12). The second holder (17) has on its upstream side a passage forming portion (19) cooperating with the yarn inlet pipe (13) to form a compressed air passage (19a) between an outer peripheral surface (13c) of a distal end (13b) of the yarn inlet pipe (13) and the passage forming portion (19). The first holder (14) and the second holder (17) are individually fixed to the nozzle body (12) to hold the brush (16) between an upstream end (14c) of the first holder (14) and a downstream end (17b) of the second holder (17).

Description

BACKGROUND OF THE INVENTION

The present invention relates to a main nozzle for an air jet loom, more specifically, a main nozzle which functions to catch a weft yarn which has been cut.
During weft insertion in an air jet loom, a weft yarn, which is inserted in a shed by a jet of compressed air from a main nozzle for an air jet loom, is subjected to a strong tension. When such weft yarn is cut at the selvedge of woven fabric after completion of the weft insertion, the weft yarn is pulled back by the strong tension and may drop out of the main nozzle for an air jet loom. In particular, a weft yarn of high stretchability, which is also called stretch yarn, is shrunk significantly simultaneously with the cutting of weft yarn. For example, a main nozzle for an air jet loom including a brush configured to catch a weft yarn is capable of catching a cut weft yarn without impairing a jet of compressed air.
Japanese Unexamined Patent Application Publication No. 2014-177725 discloses a main nozzle for an air jet loom, which is shown in FIG. 5A and designated by 51. The main part of the main nozzle 51 includes a nozzle body 52, a yarn inlet pipe 53 which is mounted to the nozzle body 52, a passage forming pipe 54, and a yarn accelerator pipe 55. The passage forming pipe 54 and the yarn accelerator pipe 55 have a brush 56 therebetween.
As shown in FIGS. 5A and 5B, the passage forming pipe 54 has a large-diameter portion 54a on the upstream side of the passage forming pipe 54 and a small-diameter portion 54b on the downstream side of the passage forming pipe 54. The small-diameter portion 54b of the passage forming pipe 54 is fitted in a second holder 58, which receives and supports a first holder 57. The upstream part of the yarn accelerator pipe 55 is partly fitted in the first holder 57 and fixed thereto by means such as adhesive, so that the yarn accelerator pipe 55 is integrated with the first holder 57.
As shown in FIGS. 5A and 5B, the brush 56 located between the passage forming pipe 54 and the yarn accelerator pipe 55 includes a holder 59 and a number of filaments 60. The holder 59 has a small-diameter portion 59a on the upstream side and a large-diameter portion 59b on the downstream side, and has at its center a hole 59c through which compressed air flows. The positioning of the brush 56 disposed downstream of the passage forming pipe 54 is accomplished by the fit of the small-diameter portion 59a of the holder 59 in a ring-shaped recess 61, which is formed in the downstream end of the small-diameter portion 54b of the passage forming pipe 54. The small-diameter portion 54b of the passage forming pipe 54, the large-diameter portion 59b of the holder 59 of the brush 56, and the upstream end of the first holder 57 are fitted in the second holder 58 to be fitted in the nozzle body 52, and bonded together by adhesive thereby to form one unit.
In the main nozzle 51 of the Publication, the upstream end of the first holder 57 is fitted in the second holder 58 which is fitted in the nozzle body 52, so that this main nozzle 51 needs to place strict controls individually on the fitting accuracy between the first holder 57 and the second holder 58 and on the fitting accuracy between the second holder 58 and the nozzle body 52 to secure concentricity between the passage forming pipe 54 and the yarn inlet pipe 53 for smooth flow of compressed air.
The present invention, which has been made in light of the above-described problem, is directed to providing a main nozzle for an air jet loom, which has a simple configuration that secures concentricity between a yarn inlet pipe (thread guide) and a brush holder.

SUMMARY OF THE INVENTION

In accordance with one aspect of the present invention, there is provided a main nozzle for an air jet loom including a nozzle body, a yarn inlet pipe, a first holder, a yarn accelerator pipe, a brush, and a second holder. The yarn inlet pipe is mounted to the nozzle body. The yarn accelerator pipe is supported by the nozzle body through the first holder. The brush is configured to catch a weft yarn and disposed between the yarn inlet pipe and the first holder. The second holder cooperates with the first holder to hold the brush. The first holder is at least partly accommodated in the nozzle body. The second holder has on the upstream side of the second holder a passage forming portion which cooperates with the yarn inlet pipe to form a compressed air passage between an outer peripheral surface of a distal end of the yarn inlet pipe and the passage forming portion. The first holder and the second holder are individually fixed to the nozzle body to hold the brush between an upstream end of the first holder and a downstream end of the second holder.
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

The invention together with objects and advantages thereof, may best be understood by reference to the following description of the 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 an embodiment of the present invention;
FIG. 2 is a perspective view of a brush of the main nozzle of FIG. 1;
FIG. 3 is a longitudinal sectional view of a main nozzle for an air jet loom according to another embodiment of the present invention;
FIG. 4 is a longitudinal sectional view of a main nozzle for an air jet loom according to another embodiment of the present invention;
FIG. 5A is a longitudinal sectional view of a main nozzle for an air jet loom according to the background art; and
FIG. 5B is an enlarged fragmentary view of the main nozzle of FIG. 5A, showing a brush and its related components of the main nozzle.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The following will describe an embodiment of the present invention with reference to the accompanying FIGS. 1 and 2. It is noted that the terms "upstream" and "downstream" appearing in the following description are used to denote directions or relative positions with respect to the direction in which a weft yarn is propelled for weft insertion. Specifically, the right side of FIG. 1 is the downstream side, and the left side of FIG. 1 is the upstream side.
Referring to FIG. 1, there is shown a main nozzle which is designated by 11 and includes a nozzle body 12, a yarn inlet pipe 13, a first holder 14, a yarn accelerator pipe 15, a brush 16 configured to catch a weft yarn, and a second holder 17. The nozzle body 12 has therein an axial hole 12a to accommodate the first holder 14, the second holder 17, and the yarn inlet pipe 13. The nozzle body 12 accommodates a large-diaimeter portion 14a and a part of a small-diameter portion 14b of the first holder 14 in the axial hole 12a. The axial hole 12a of the nozzle body 12 has a small-diameter portion 12b on the downstream side of the axial hole 12a and a large-diameter portion 12c on the upstream side of the axial hole 12a so as to have a stepped shape.
The yarn inlet pipe 13 is mounted to the nozzle body 12 on the upstream side of the nozzle body 12. The second holder 17 is disposed immediately downstream of the yarn inlet pipe 13. The first holder 14 is disposed downstream of the second holder 17 across the brush 16. The yarn accelerator pipe 15 is supported by the nozzle body 12 through the first holder 14. The brush 16 is disposed in a compressed air passage which is formed between the yarn inlet pipe 13 and the first holder 14. The nozzle body 12 is integrated with a main nozzle bracket 18. The yarn inlet pipe 13 has at its upstream end a guide 13a having a funnel opening and made of a hard material such as a ceramic.
The second holder 17 has a passage forming portion 19 on the upstream side of the second holder 17. The passage forming portion 19 cooperates with the yarn inlet pipe 13 to form a compressed air passage 19a between an outer peripheral surface 13c of a distal end 13b of the yarn inlet pipe 13 and the passage forming portion 19. The distal end 13b of the yarn inlet pipe 13 is loosely inserted in the passage forming portion 19 of the second holder 17. The yarn inlet pipe 13 has an external thread 20 on the outer periphery of the yarn inlet pipe 13. The external thread 20 is engaged with an internal thread formed at the upstream end of the nozzle body 12 to determine the position of the distal end 13b of the yarn inlet pipe 13. The yarn inlet pipe 13 is fixed to the nozzle body 12 by a nut 21 attached to the external thread 20 of the yarn inlet pipe 13 with the distal end 13b of the yarn inlet pipe 13 positioned appropriately.
As shown in FIG. 2, the brush 16 includes a holder 22 and a number of filaments 23. The holder 22 has a small-diameter portion 22a and a large-diameter portion 22b in which the proximal ends of the filaments 23 are implanted. The holder 22 has therein a passage 22c for compressed air, which passes through the axial center of the holder 22. The filaments 23 are arranged circumferentially around the passage 22c of the holder 22. The tips of the filaments 23 are directed downstream of the passage 22c and slightly tapered toward the center of the passage 22c of the holder 22.
As shown in FIG. 1, the brush 16 of the main nozzle 11 is supported in the second holder 17 with the holder 22 of the brush 16 fitted in a recess 17a which is formed at a downstream end 17b of the second holder 17.
The first holder 14 and the second holder 17 are individually fixed to the nozzle body 12 to hold the holder 22 of the brush 16 between an upstream end 14c of the first holder 14 and the downstream end 17b of the second holder 17. The first holder 14 has on its upstream side the large-diameter portion 14a and on its downstream side the small-diameter portion 14b supporting the yarn accelerator pipe 15. The small-diameter portion 14b and the large-diameter portion 14a of the first holder 14 are fitted in the small-diameter portion 12b and the large-diameter portion 12c of the nozzle body 12, respectively, to position the first holder 14 such that the downstream end of the large-diameter portion 14a of the first holder 14 abuts on the downstream end of the large-diameter portion 12c of the nozzle body 12. The first holder 14 is fixed to the nozzle body 12 with a hexagon socket head cap screw 24, which is screwed into a screw hole formed in the nozzle body 12, with the large-diameter portion 14a of the first holder 14 abutting on the downstream end of the large-diameter portion 12c of the nozzle body 12. The second holder 17 is fixed to the nozzle body 12 with a hexagon socket head cap screw 25, which is screwed into a screw hole formed in the nozzle body 12 at a position corresponding to the passage forming portion 19.
The following will describe the operation of the main nozzle 11 which is configured as described above.
The first holder 14 and the second holder 17 are individually fixed to the nozzle body 12 to individually position the first holder 14 and the second holder 17 relative to the nozzle body 12. This configuration ensures that the first holder 14 and the second holder 17 are fixed to the nozzle body 12 with the first holder 14 and the second holder 17 arranged concentrically. The brush 16 is held between the upstream end 14c of the first holder 14 and the downstream end 17b of the second holder 17, thereby being held in a predetermined position. The main nozzle 11 according to the embodiment of the present invention has a simpler configuration to secure concentricity of the brush holders (the first holder 14 and the second holder 17) with respect to the yarn inlet pipe 13 than the main nozzle 51 of the background art having the configuration that the second holder 58 is fixed to the nozzle body 52 with the small-diameter portion 54b of the passage forming pipe 54 and the first holder 57 fitted in the cylindrical second holder 58.
For weft insertion while the air jet loom is operating, compressed air is supplied to the main nozzle 11 in response to the operation of an air valve (not shown). Compressed air is rectified, restricted in the passage forming portion 19, and jetted into the passage 22c of the holder 22. The jet of compressed air ejects a weft yarn (not shown), which was introduced into the yarn inlet pipe 13 and presents in the yarn accelerator pipe 15, from the downstream opening of the yarn accelerator pipe 15 and propels the weft yarn through a warp shed (not shown).
When the weft insertion is completed and the weft yarn is cut by a cutter (not shown), the weft yarn remaining in the main nozzle 11 is pulled back into the yarn accelerator pipe 15 due to tension acting on the weft yarn. In this case, particularly, a stretch yarn having high stretchablity is shrunk significantly. The weft yarn is shrunk meanderingly while being brought into repeated contact with the inner wall of the yarn accelerator pipe 15. The weft yarn is also shrunk meanderingly where the brush 16 is disposed, so that such meandering shrinkage of the weft yarn enables the filaments 23 of the brush 16 to certainly catch the weft yarn. Accordingly, the filaments 23 are operable to stop the pull-back of the weft yarn, thereby causing the leading end of the weft yarn remain in the yarn accelerator pipe 15.
At a start of the subsequent weft insertion, compressed air jetted through the passage forming portion 19 of the second holder 17 propels the weft yarn caught by the filaments 23 of the brush 16 in the yarn accelerator pipe 15, so that weft insertion is performed properly.
For the mounting of the yarn inlet pipe 13, the first holder 14, the brush 16, and the second holder 17 to the nozzle body 12, firstly, the first holder 14 integrated with the yarn accelerator pipe 15 is inserted into the axial hole 12a of the nozzle body 12 from the upstream end of the first holder 14 until the downstream end of the large-diameter portion 14a of the first holder 14 abuts on the downstream end of the large-diameter portion 12c of the axial hole 12a of the nozzle body 12. The first holder 14 is fixed to the nozzle body 12 with the hexagon socket head cap screw 24 with the first holder 14 inserted in the axial hole 12a such that the downstream end of the large-diameter portion 14a abuts on the downstream end of the large-diameter portion 12c.
Next, the holder 22 of the brush 16 is fitted in the recess 17a of the second holder 17. The second holder 17 with the holder 22 is inserted into the axial hole 12a of the nozzle body 12 from the filaments 23 side of the brush 16 until the downstream end 17b of the second holder 17 abuts on the upstream end 14c of the first holder 14. The second holder 17 is fixed to the nozzle body 12 with the hexagon socket head cap screw 25 with the second holder 17 inserted in the axial hole 12a such that the downstream end 17b of the second holder 17 abuts on the upstream end 14c of the first holder 14.
The yarn inlet pipe 13 is inserted into the axial hole 12a of the nozzle body 12 from the distal end 13b of the yarn inlet pipe 13 to engage the external thread 20 of the yarn inlet pipe 13 with the internal thread of the axial hole 12a, and screwed into a predetermined position. The nut 21 attached to the external thread 20 is tightened to complete the mounting of the yarn inlet pipe 13, the first holder14, the brush 16 and the second holder 17 to the nozzle body 12.
The brush 16 is a consumable. For replacement of the brush 16, firstly, the nut 21 attached to the yarn inlet pipe 13 is loosened to release the external thread 20 of the yarn inlet pipe 13 from the internal thread of the axial hole 12a of the nozzle body 12 so that the yarn inlet pipe 13 is unscrewed from the axial hole 12a. Next, the hexagon socket head cap screws 24, 25 are loosened. The yarn accelerator pipe 15 is pushed toward the axial hole 12a of the nozzle body 12 to be moved to a position where the second holder 17 is pushed out of or can be easily pulled out from the axial hole 12a.
After the second holder 17 is removed from the axial hole 12a, the brush 16 is removed from the recess 17a of the second holder 17 and replaced with a new one. The new brush 16 attached to the second holder 17 is inserted into the axial hole 12a until the downstream end of the large-diameter portion 14a of the first holder 14 abuts on the downstream end of the large-diameter portion 12c of the axial hole 12a. The first and the second holders 14, 17 are respectively fixed to the nozzle body 12 with the hexagon socket head cap screws 24, 25 with the downstream end of the large-diameter portion 14a of the first holder 14 abutting on the downstream end of the large-diameter portion 12c of the axial hole 12a. The yarn inlet pipe 13 is inserted into the axial hole 12a to a predetermined position so that the external thread 20 of the yarn inlet pipe 13 is engaged with the internal thread of the axial hole 12a at predetermined amount. The nut 21 attached to the external thread 20 is tightened to fix the yarn inlet pipe 13 to the nozzle body 12 in a predetermined position for completing the replacement of the brush 16.
For the smooth weft insertion after the replacement of the brush 16, the positional relationship between the distal end 13b of the yarn inlet pipe 13 and the passage forming portion 19 of the second holder 17 needs to be restored to the positional relationship before the replacement of the brush 16. In this embodiment, the first holder 14 is fixed to the nozzle body 12 with the hexagon socket head cap screw 24 with the large-diameter portion 14a of the first holder 14 positioned in abutment with the downstream end of the large-diameter portion 12c of the axial hole 12a, thus, the first holder 14 is restored to original position of the first holder 14. The second holder 17 is fixed to the nozzle body 12 with the hexagon socket head cap screw 25 with the downstream end 17b of the second holder 17 positioned in abutment with the upstream end 14c of the first holder 14, thus, the second holder 17 is restored to the original position of the second holder 17. That is, the first holder 14 and the second holder 17 abut each other. Since the yarn inlet pipe 13 is fixed tο the nozzle body 12 in a predetermined position, this configuration enables the positional relationship between the distal end 13b of the yarn inlet pipe 13 and the passage forming portion 19 of the second holder 17 to be restored to the original one for smooth weft insertion after the replacement of the brush 16.
The embodiment of the present invention offers the following effects.

(1) The main nozzle 11 for an air jet loom includes the nozzle body 12, the yarn inlet pipe 13 mounted to the nozzle body 12, the first holder 14, the yarn accelerator pipe 15 supported by the nozzle body 12 through the first holder 14, the brush 16 configured to catch a weft yarn and disposed in the passage for compressed air formed between the yarn inlet pipe 13 and the first holder 14, and the second holder 17 cooperating with the first holder 14 to hold the brush 16 between the first holder 14 and the second holder 17. The first holder 14 is at least partly accommodated in the nozzle body 12, and the second holder 17 has on its upstream side the passage forming portion 19 which cooperates with the yarn inlet pipe 13 to form the compressed air passage 19a between the outer peripheral surface 13c of the distal end 13b of the yarn inlet pipe 13 and the passage forming portion 19. The first holder 14 and the second holder 17 are individually fixed to the nozzle body 12 to hold the brush 16 between the upstream end 14c of the first holder 14 and the downstream end 17b of the second holder 17.

According to this embodiment, the first holder 14 and the second holder 17 are individually fixed to the nozzle body 12 to individually position the first holder 14 and the second holder 17 relative to the nozzle body 12. This configuration ensures that the first holder 14 and the second holder 17 are fixed to the nozzle body 12 with the first holder 14 and the second holder 17 arranged concentrically. The brush 16 is held between the upstream end 14c of the first holder 14 and the downstream end 17b of the second holder 17 so as to be held in a predetermined position. Accordingly, the main nozzle 11 according to the embodiment of the present invention has a simpler configuration to secure concentricity of the brush holders (the first holder 14 and the second holder 17) with respect to the yarn inlet pipe 13 than the main nozzle 51 of the background art having the configuration that the second holder 58 is fixed to the nozzle body 52 with the small-diameter portion 54b of the passage forming pipe 54 and the first holder 57 fitted in the cylindrical second holder 58.
Since the first holder 14 is at least partly accommodated in the nozzle body 12, the main nozzle 11 according to the embodiment of the present invention allows the yarn accelerator pipe 15 to be formed longer than the yarn accelerator pipe 55 of the nozzle body 52 disclosed in the Publication in which the whole of the first holder 57 is disposed outside of the nozzle body 52. Accordingly the air disturbed by the brush 16 is rectified in the yarn accelerator pipe 15, and the weft yarn is propelled steady by the jet of the rectified air from the yarn accelerator pipe 15.

(2) The first holder 14 has on its upstream side the large-diameter portion 14a and on its downstream side the small-diameter portion 14b supporting the yarn accelerator pipe 15. According to this configuration, the abutment of the downstream end of the large-diameter portion 14a with the nozzle body 12 determines the fixing position of the first holder 14 relative to the nozzle body 12, so that the first holder 14 is fixed easily in a predetermined position.
(3) The first holder 14 and the second holder 17 abut each other. This configuration eliminates or minimizes the displacement of the second holder 17 due to the wear of the brush 16, thereby maintaining the positional relationship between the yarn inlet pipe 13 and the second holder 17, that is, the positional relationship between the yarn inlet pipe 13 and the passage forming portion 19 of the second holder 17, and stabilizing the jet of compressed air. Additionally, when the second holder 17 is removed from the nozzle body 12 for the replacement of the brush 16, this configuration enables the removed second holder 17 to be easily restored to the original position in the nozzle body 12 after the replacement of the brush 16.
(4) The nozzle body 12 is integrated with the main nozzle bracket 18. The nozzle body 12 may be formed separately from the main nozzle bracket 18 and fixed to the main nozzle bracket 18 with a fastener such as a screw. However, the integration of the nozzle body 12 with the main nozzle bracket 18 facilitates the mounting of the main nozzle 11 to a loom.

The embodiment of present invention is not limited to the aforementioned embodiment, but may be modified in various manners, as exemplified below.
As shown in FIG. 3, the first holder 14 may have a diameter which is substantially constant throughout its length and approximately the same as the diameter of the second holder 17, so that this configuration enables the brush 16 to be removed from the both of the upstream and the downstream sides of the nozzle body 12. Specifically, the brush 16 is removable from the downstream side of the nozzle body 12 after the first holder 14 is removed from the nozzle body 12, and also removable from the upstream side of the nozzle body 12 after the yarn inlet pipe 13 is removed from the nozzle body 12. Thus, this configuration allows the brush 16 to be removed from the downstream side of the nozzle body 12 or from the upstream side of the nozzle body 12, whichever is easier, so that the replacement of the brush 16 is facilitated.
In this case, the axial hole 12a of the nozzle body 12 is formed with a constant diameter throughout its length without the small-diameter portion 12b and the large-diameter portion 12c. This configuration facilitates making of the axial hole 12a for accommodating the first holder 14 in the nozzle body 12. Additionally, in this configuration, the brush 16 can be replaced without the removal of the yarn inlet pipe 13 from the nozzle body 12 when the brush 16 is removed from the downstream end of the nozzle body 12 after the first holder 14 is removed from the nozzle body 12, so that the positioning of the yarn inlet pipe 13 need not be performed at every replacement of the brush 16. For the replacement of the brush 16 in this case, for example, the brush 16 may be pulled out of the nozzle body 12 with a tool having a hook portion, which is insertable in the nozzle body 12 from the downstream side of the nozzle body 12 and is capable of hooking the filaments 23 of the brush 16.
As shown in FIG. 4, the first holder 14 may be fixed to the nozzle body 12 by the engagement of an external thread 30, which is formed on the outer peripheral surface of the middle portion of the first holder 14, with an internal thread 31 which is formed at the downstream end of the nozzle body 12, so that the holder 22 of the brush 16 is fixed in a predetermined position with the holder 22 positioned in abutment with the upstream end 14c of the first holder 14 and the downstream end of the second holder 17. In this case, firstly, the second holder 17 is fixed to the nozzle body 12 with the hexagon socket head cap screw 25 such that the passage forming portion 19 is placed in a predetermined position. The brush 16 is inserted in the axial hole 12a of the nozzle body 12 from the downstream side of the nozzle body 12. The first holder 14 is engaged with the internal thread 31 of the nozzle body 12. Then, the second holder 17, the brush 16, and the first holder 14 are reliably positioned in the axial direction of the nozzle body 12. The brush 16 can be replaced without the removal of the yarn inlet pipe 13 from the nozzle body 12, so that the positioning of the yarn inlet pipe 13 need not be performed at every replacement of the brush 16.
As shown in FIG. 4, the second holder 17 may have a step portion 32 so as to have a small-diameter portion at the downstream end of the second holder 17. This configuration facilitates the positioning of the second holder 17.
As shown in FIG. 4, the holder 22 of the brush 16 may be fitted in the second holder 17 such that the large-diameter portion 22b of the holder 22 is fitted in the axial hole 12a of the nozzle body 12 while the small-diameter portion 22a of the holder 22 is fitted in the second holder 17.
The large-diameter portion 22b of the holder 22 of the brush 16 shown in FIGS. 1 to 3 may have a diameter which is approximately the same as the diameter of the upstream end 14c of the first holder 14.
The nozzle body 12 may be formed separately from the main nozzle bracket 18.
The first holder 14 needs to be at least partly accommodated in the nozzle body 12, but the whole of the first holder 14 may be inserted in the nozzle body 12.
The hexagon socket head cap screw 24 for fixing the first holder 14 to the nozzle body 12 may be replaced with a general screw or bolt.
The hexagon socket head cap screw 25 for fixing the second holder 17 to the nozzle body 12 may be replaced with a general screw or bolt.
A main nozzle (11) for an air jet loom includes a nozzle body (12), a yarn inlet pipe (13) mounted to the nozzle body (12), a first holder (14), a yarn accelerator pipe (15) supported by the nozzle body (12) through the first holder (14), a brush (16) between the yarn inlet pipe (13) and the first holder (14), and a second holder (17) cooperating with the first holder (14) to hold the brush (16). The first holder (14) is at least partly accommodated in the nozzle body (12). The second holder (17) has on its upstream side a passage forming portion (19) cooperating with the yarn inlet pipe (13) to form a compressed air passage (19a) between an outer peripheral surface (13c) of a distal end (13b) of the yarn inlet pipe (13) and the passage forming portion (19). The first holder (14) and the second holder (17) are individually fixed to the nozzle body (12) to hold the brush (16) between an upstream end (14c) of the first holder (14) and a downstream end (17b) of the second holder (17).

Claims

A main nozzle (11) for an air jet loom, comprising:
a nozzle body (12);

a yarn inlet pipe (13) mounted to the nozzle body (12);

a first holder (14);

a yarn accelerator pipe (15) supported by the nozzle body (12) through the first holder (14);

a brush (16) configured to catch a weft yarn and disposed between the yarn inlet pipe (13) and the first holder (14); and

a second holder (17) cooperating with the first holder (14) to hold the brush (16), characterized in that

the first holder (14) is at least partly accommodated in the nozzle body (12),

the second holder (17) has on the upstream side of the second holder (17) a passage forming portion (19) cooperating with the yarn inlet pipe (13) to form a compressed air passage (19a) between an outer peripheral surface (13c) of a distal end (13b) of the yarn inlet pipe (13) and the passage forming portion (19), and

the first holder (14) and the second holder (17) are individually fixed to the nozzle body (12) to hold the brush (16) between an upstream end (14c) of the first holder (14) and a downstream end (17b) of the second holder (17).
The main nozzle (11) for an air jet loom according to claim 1, characterized in that
the first holder (14) has a large-diameter portion (14a) on the upstream side of the first holder (14) and a small-diameter portion (14b) on the downstream side of the first holder (14), and
the small-diameter portion (14b) of the first holder (14) supports the yarn accelerator pipe (15).
The main nozzle (11) for an air jet loom according to claim 1, characterized in that the first holder (14) has a substantially constant diameter throughout a length of the first holder (14).
The main nozzle (11) for an air jet loom according any one of claims 1 to 3, characterized in that the first holder (14) and the second holder (17) abut each other.