[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.
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.
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.
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.