U.S. patent application number 10/527964 was filed with the patent office on 2006-07-27 for nozzle for supporting a weft thread in a weaving machine.
Invention is credited to Jozef Peeters.
Application Number | 20060162805 10/527964 |
Document ID | / |
Family ID | 32111405 |
Filed Date | 2006-07-27 |
United States Patent
Application |
20060162805 |
Kind Code |
A1 |
Peeters; Jozef |
July 27, 2006 |
Nozzle for supporting a weft thread in a weaving machine
Abstract
Nozzle for supporting a weft thread in a weaving machine,
provided with a flow-through canalisation for a fluid flowing out
in at least one outlet opening, wherein the nozzle is at least
partially composed of segments.
Inventors: |
Peeters; Jozef; (Antwerpen,
BE) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE
FOURTH FLOOR
ALEXANDRIA
VA
22314
US
|
Family ID: |
32111405 |
Appl. No.: |
10/527964 |
Filed: |
October 17, 2003 |
PCT Filed: |
October 17, 2003 |
PCT NO: |
PCT/BE03/00177 |
371 Date: |
March 15, 2005 |
Current U.S.
Class: |
139/435.2 |
Current CPC
Class: |
D03D 47/302
20130101 |
Class at
Publication: |
139/435.2 |
International
Class: |
D03D 47/30 20060101
D03D047/30 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 23, 2002 |
BE |
2002/0607 |
Claims
1. Nozzle for supporting a weft thread in a weaving machine,
comprising at least one outlet opening; a flow-through canalisation
for supplying a fluid to said at least one outlet opening; said
nozzle being at least partially formed of segments.
2. Nozzle according to claim 1, wherein the outer shape of the
nozzle and the inner shape of the flow-through canalisation are
different from each other and wherein said segments define said
inner shape.
3. Nozzle according to claim 1, wherein the segments are
plate-shaped.
4. Nozzle according to claim 1, wherein the segments are disposed
in a casing.
5. Nozzle according to claim 1, wherein at least a number of the
segments are mutually connected.
6. Nozzle according to claim 1, wherein at least a number of the
segments are pressed loosely against each other.
7. Nozzle according to claim 1, wherein the nozzle is elongated and
the segments extend along the longitudinal direction of the
nozzle.
8. Nozzle according to claim 3, wherein the segments are disposed
such that they are directed with one edge facing towards a side of
the nozzle in which the outlet opening or outlet openings are
located.
9. Nozzle according to claim 1, wherein said segments at least in
part form one or more partition walls within the flow-through
canalisation.
10. Nozzle according to claim 9, wherein the nozzle has at least
two outlet openings, and wherein one or more partition walls define
separate ducts extending towards a respective outlet opening and/or
groups of outlet openings.
11. Nozzle according to claim 10, wherein said one or more
partition walls extend up to a side of the nozzle where the outlet
openings open into the environment.
12. Nozzle according to claim 9, wherein one or more of said
partition walls are formed as a longitudinal partition.
13. Nozzle according to claim 12, wherein the partition wall or
walls enable a lateral division of the flow-through canalisation in
the ducts.
14. Nozzle according to claim 9, wherein the nozzle is elongated
and the flow-through canalisation generally extends in the
longitudinal direction of the nozzle and traces a curve near a top
end of the nozzle to finally flow into the outlet opening or outlet
openings, and further wherein one or more of the partition walls
extend through at least a part of said curve.
15. Nozzle according to claim 9, wherein at least one of the
partition walls is made as a cross partition defining a
blade-shaped guide near the outlet opening or outlet openings.
16. Nozzle according to claim 9, wherein at least one of the
partition walls extends crosswise in one piece from one side to the
other side of the flow-through canalisation.
17. Nozzle according to claim 9, wherein mainly all the partition
walls extend downward up to a distance (A) from the outlet opening
or outlet openings which is larger than the length of the hairs
which are usually found on textile fibres.
18. Nozzle according to claim 1, wherein the segments, as well as
any partition walls formed by same, comprise plate-shaped elements
which extend slantingly at an angle (H) according to a general
direction which, when the nozzle is mounted in a weaving machine,
extends slantingly towards a reed of the weaving machine.
19. Nozzle according to claim 1, wherein at least one of the
segments comprises an intermediate connection forming a
reinforcement for a body of the nozzle, at least in the central
part of the nozzle.
20. Nozzle according to claim 1, wherein at lease some of the
segments are formed to serve as guiding elements to direct a fluid
jet discharged from the outlet opening or outlet openings when the
nozzle is in use.
21. Nozzle according to claim 1, wherein the segments comprise
straight, mainly flat contiguous elements.
22. Nozzle according to claim 1, wherein at least some of the
segments comprise elements having varying thicknesses and/or shapes
which are not flat.
23. Nozzle according to claim 1, wherein the nozzle has a series of
outlet openings which are arranged step-like, by means of the
segmented construction, from one far end of the series to the other
far end thereof.
24. Nozzle for supporting a weft thread in a weaving machine, said
nozzle comprising a flow-through canalisation for a fluid flowing
out of at least one outlet opening of the nozzle, comprising one or
a combination of two or more of the following: the nozzle is
provided with at least two outlet openings, and wherein at least
one partition wall is provided in the top part of the nozzle
separating at least the two outlet openings, at least at a point
located situated inside the flow-through canalisation and up to an
outer wall of the nozzle, or practically up to said outer wall,
where the outlet openings open to the environment; the nozzle is
elongated and is provided with one or several partition walls
extending in the longitudinal direction of the flow-through
canalisation, said partition walls extending crosswise and
continuing substantially from one side of the flow-through
canalisation to the opposite other side; the nozzle is provided
with at least one outlet opening and at least one partition wall
made as a cross partition in the shape of a blade-shaped guide
disposed near each outlet opening; the nozzle is provided with one
or more partition walls, at least a number of said partition walls
extending downward up to at least a distance (A) from each outlet
opening, said distance being larger than the hair length of the
hairs which are usually found on textile fibres; the nozzle is
provided with at least an intermediate connection extending through
the flow-through canalisation and forming a reinforcement for a
body of the nozzle; the nozzle is provided with a series of outlet
openings which are arranged in a step-like manner from one far end
of said series to the other far end; and the nozzle has a head
part, including said canalisation and wherein partition walls are
disposed in the flow-through canalisation of said head part which,
due to their direction and/or shape, function as guiding elements
to direct a fluid jet leaving the outlet opening or outlet openings
when the nozzle is in use.
Description
[0001] The present invention concerns a nozzle for supporting a
weft thread in a weaving machine, in other words a nozzle for
creating a fluid jet to carry a weft thread along the reed of the
weaving machine through the weaving shed.
[0002] In the first place is meant a relay nozzle for an air jet
weaving machine by such a nozzle, but it is clear that more
generally also other nozzles are meant by it, also for other fluids
than air.
[0003] It is known that such nozzles can be made in different
shapes, as a function of the aimed effect.
[0004] Thus, for example, a nozzle is known from BE 1,012,608 which
is provided with a lateral protuberance near its free end which is
mainly directed towards the reed when the nozzle is used. This
special outer shape offers the advantage that the nozzle can be
smoothly moved through the warp threads in and out of the weaving
shed. Such a special outer shape has for a result that, if the
nozzle were made of a housing with a constant wall thickness, also
the inner shape would assume the special design of the outer shape,
which of course is not ideal for the flow of the fluid through the
nozzle. That is why it was suggested in BE 1,012,608 to apply an
inner shape which differs from the outer shape.
[0005] Also from other patent documents, for example EP 0,145,824,
CS 266,516 and CS 281,607 it is known to apply an inner shape which
clearly differs from the outer shape.
[0006] A general problem with the techniques known until now for
manufacturing nozzles consists in that it is not easy to provide a
desired flow-through canalisation therein, especially not when the
inner shape of the nozzle differs from the outer shape.
[0007] In general, such nozzles are relatively small, and providing
a flow-through canalisation therein was not simple until now, all
the more as such a flow-through canalisation has to be made rather
accurately, as it determines the flow of the fluid leaving the
nozzle, in other words of the outgoing fluid jet, and as such a
fluid jet has to be directed as powerful and as good as possible in
order to optimally move a weft thread along the reed.
[0008] Also, according to a first aspect of the invention, it aims
a nozzle which can be made in an efficient manner, whereby the
inner shape and the outer shape can be easily optimised
independently from each other and whereby practically any shape
whatsoever can be easily realised.
[0009] According to this first aspect, the invention concerns a
nozzle for supporting a weft thread in a weaving machine which is
provided with a flow-through canalisation for a fluid flowing out
in at least one outlet opening, characterised in that the nozzle is
at least partially composed of segments.
[0010] By making use of segments, they can be easily made
separately and be joined together afterwards. Since every segment
only forms a part of the whole, it is as such easily accessible
from all sides and there is no problem to realise it in any desired
shape whatsoever.
[0011] Further, the use of such segments makes it possible to
easily realise different inner shapes, in other words shapes for
the flow-through canalisation.
[0012] The segments are preferably made plate-shaped, in particular
as thin plates which are placed against one another. In order to
form such plates, one can simply take a base plate out of which
said plates can be made in any desired shape whatsoever. It is
clear that in order to make them, a large number of techniques
known as such are available, such as for example wire sparking,
laser cutting, milling, etching, electroforming, fine-blanking,
etc. Techniques of another nature are not excluded either. Thus,
for example, the plates can also be realised by means of a casting
technique, after which they can possibly be finished
mechanically.
[0013] The segments may be formed of straight, flat elements, for
example flat plates, which are placed against each other. Such
straight, flat elements offer the advantage that they can be easily
realised and are also easy to combine into a whole. However, this
does not exclude that segments can also be applied having a shape
which is different from a flat shape, which offers the advantage
that it is easy to create special effects, for example in view of
the optimisation of the fluid jet flowing out of the nozzle.
[0014] The segments, in particular the plates, can be made with a
constant thickness as well as with a varying thickness, which also
allows to create different effects. It should be noted that the
thickness of the segments can be very small and may for example
amount to 0.1 mm or even less. Further, it is possible to apply
segments of varying thickness and/or shape in one and the same
nozzle, so that for example partition walls realised with the
latter can be made very thin, whereas the segments serving as
lateral parts can be made relatively thick.
[0015] The use of segments offers the advantage that any shape
whatsoever can be easily made with great accuracy.
[0016] According to a preferred embodiment, the segments are held
in a casing, as a result of which they remain together with
certainty. Moreover, the casing can be made of a thin plate
material, such that a smooth outer side is at all times guaranteed,
which is important in order to prevent the warp threads from
meshing in the nozzles. It is clear, however, that such a casing is
optional, since, according to a variant, it is possible to provide
the segments as a whole with a smooth outer side.
[0017] The different segments, in particular the different plates,
can be mutually connected, either in a mechanical manner or in any
other way whatsoever, for example by means of gluing, welding,
sintering, etc. An advantageous technique for welding plates
together consists in that use is made of hard soldering in a vacuum
or in a specific gaseous atmosphere in an oven. The solder can
hereby be provided on the plates by means of for example a
silkscreen printing technique, which allows for a very precise
dosage of the jointing media.
[0018] It should be noted that for example the etching and
fine-blanking of plates, as well as vacuum soldering in an oven can
be done very cheaply in large quantities, guaranteeing an economic
production.
[0019] According to another possibility, at least a number of the
segments can be pressed loosely against one another. In the case
where the segments are for example pushed in a casing, this casing
can make sure that the segments are automatically held
together.
[0020] The segments can be made of any material whatsoever offering
sufficient stability. Practical examples are for example metal,
such as steel or aluminium, and ceramic material. Also the use of
less costly materials, such as for example synthetic material, is
not excluded.
[0021] Although the segments can be made in different shapes and
dimensions, use is preferably made of a series of segments
extending in the longitudinal direction of the nozzle, for example
a series of plates placed against each other.
[0022] In the case of plate-shaped segments, they are moreover
preferably situated in planes extending mainly crosswise to the
front side of the nozzle, in other words which are situated such
that they are directed with one edge to the side of the nozzle in
which the outlet opening or outlet openings are situated.
[0023] The segmented construction according to the invention makes
it possible for the nozzle to be provided with internal partition
walls of different nature in a relatively simple manner, especially
when plate-shaped segments provided next to each other are used.
According to a special embodiment, such a nozzle will have one or
several parts built up by means of the segments serving as a
partition wall in the flow-through canalisation.
[0024] Such partition walls are in the first place designed to
optimise the fluid flow, but they can also be used for other
effects, such as for example to reinforce the structure of the
nozzle or the like.
[0025] The partition walls can be made in different manners,
offering different advantages, which will become clear from the
following description of the examples represented in the
figures.
[0026] According to a second aspect of the present invention, it
concerns a nozzle which is provided with at least two outlet
openings, whereby at least one either or not partition wall of one
piece is present in the top part of the nozzle separating at least
the two outlet openings, at least as of a point situated inside the
actual flow-through canalisation up to the outer wall, or
practically up to the outer wall where the outlet openings open in
the outer side. Thus is obtained that the fluid is guided not only
at the height of the outlet openings, as is known from BE 1,012,608
and JP 55-172384, but that the fluid is also efficiently guided
inside the actual head part of the nozzle, as a result of which it
may be assumed that it is possible to obtain better flow
characteristics for the fluid. Thanks to a correct positioning of
such a partition wall, or possibly of several of such partition
walls in the flow-through canalisation, it also becomes possible to
supply the fluid in the right proportions to each of the outlet
openings.
[0027] Thanks to this second aspect is also obtained that the fluid
is guided separately up to the moment when the fluid leaves the
nozzle, which is particularly useful to optimize the outgoing fluid
jet, as opposed to the embodiment described in EP 0,145,824, where
there is no partition in the actual outlet opening.
[0028] According to a third aspect of the present invention, it
concerns a nozzle which is provided with one or several partition
walls extending in the longitudinal direction of the flow-through
canalisation, whereby these partition walls extend crosswise and
continue materially from one side of the flow-through canalisation
up to the opposite other side. By making use of one or several
partition walls extending as a single material through the
flow-through canalisation, this offers the advantage that the
structure of the nozzle is reinforced. Compared to a partition wall
which is free at one far end opposite to the opposite side, as is
known from EP 0,145,824, this moreover offers the advantage that
any meshing of pieces of fluff or little hairs of warp threads
and/or weft threads as they get jammed in between the free end of
the partition wall and the opposite wall, which may result in
obstructions, is excluded.
[0029] According to a fourth aspect of the present invention, it
concerns a nozzle which is provided with at least one partition
wall made as a cross partition in the shape of a blade-shaped guide
near the outlet opening or outlet openings. The use of actual
blades offers the advantage that an individual direction for the
outgoing fluid can be realised for each individual outflow
duct.
[0030] According to a fifth aspect of the present invention, it
concerns a nozzle which is provided with one or several partition
walls, whereby at least a number thereof extend downward up to at
least a distance from the outlet opening or outlet openings, which
is larger than the hair length of the hairs which are usually found
on textile fibres, in particular up to a distance of about 1 cm.
Thus, fibres, hairs and the like which have penetrated cannot mesh
behind the inner edge of such partition walls, which may be the
case with traditional embodiments.
[0031] According to a sixth aspect of the present invention, it
concerns a nozzle which is provided with at least an intermediate
connection extending through the flow-through canalisation and
forming a reinforcement for the body of the nozzle, which
intermediate connection may for example also consist of a partition
wall. Thus, the bending strength of the nozzle is considerably
increased, as a result of which the risk of deformations which may
have an influence on the direction of the fluid jet is reduced. By
the body is hereby meant the slender top part which, as is known,
is at least partially moved through the warp threads. Said
intermediate connection preferably extends at least through the
central part of the body and, better still, it extends over a large
part of the aforesaid body up to, or practically up to its bottom
side.
[0032] According to a seventh aspect of the present invention, it
concerns a nozzle which is provided with a series of outlet
openings which are arranged in a step-like manner from one far end
of said series to the other far end in relation to the longitudinal
direction. Thus, in a general manner, it is possible to realise a
relatively flat fluid jet. Thanks to the correct position of the
stepped arrangement, it moreover becomes possible for the fluid jet
to optimally work in conjunction with a weft thread which is
usually situated in the conveyor duct in the reed.
[0033] According to an eight aspect of the present invention, it
concerns a nozzle which is provided with a head part, whereby one
or several partition walls are present in the flow-through
canalisation of this head part which, as a result of their
direction and/or shape, function as guiding elements to direct the
fluid jet or fluid jets leaving the outlet opening or outlet
openings when the nozzle is used. Thus, it is not only the
outermost inner wall of the flow canalisation which determines the
direction and the behaviour of the outgoing fluid jet, but this
direction is also determined by the partition wall or partition
walls. As a result, the behaviour of the general fluid jet can be
further optimised, and it is even possible to separately influence
the respective partial jets, in other words the jets coming out of
the respective outlet openings.
[0034] It is clear that the embodiments according to the second to
eight aspect are easy to realise in practice by making use of a
segmented construction corresponding to the aforesaid first aspect
of the invention. However, this does not exclude that nozzles
according to the second to eighth aspect of the invention can also
be realised without a segmented construction being applied thereby.
It is clear that in this case also, the aforesaid advantages remain
applicable.
[0035] According to the invention, the characteristics of each of
the aforesaid eight aspects can be combined at random. Also all
other partial characteristics which will appear from the further
description and claims can be combined at random with one or
several of the main characteristics of each of the aforesaid
aspects, at least in so far that these characteristics are not
conflicting.
[0036] In order to better explain the characteristics of the
invention, the following preferred embodiments according to the
invention are described as an example only without being limitative
in any way, with reference to the accompanying drawings, in
which:
[0037] FIG. 1 represents a part of a weaving machine with several
nozzles according to the invention;
[0038] FIG. 2 represents a section according to line II-II in FIG.
1;
[0039] FIG. 3 represents the nozzle represented in FIG. 2 in
perspective and to a larger scale;
[0040] FIG. 4 represents a section according to line IV-IV in FIG.
3;
[0041] FIG. 5 represents the nozzle from FIG. 3 when
disassembled;
[0042] FIGS. 6 and 7 represent views analogous to those of FIGS. 3
and 4, but for a variant;
[0043] FIG. 8 represents another variant as disassembled;
[0044] FIG. 9 represents a section according to line IX-IX in FIG.
8, but as composed, however;
[0045] FIGS. 10, 11 and 12 represent views analogous to those of
FIGS. 3, 4 and 5, but for a variant;
[0046] FIGS. 13, 14 and 15 represent views analogous to those of
FIGS. 3, 4 and 5, but for another variant;
[0047] FIGS. 16 and 17 represent sections of two more embodiments
of a nozzle according to the invention;
[0048] FIGS. 18, 19 and 20 represent cross sections of three
further embodiments of a nozzle according to the invention;
[0049] FIG. 21 represents a section of an embodiment, whereby a
crosswise directed partition wall is provided in the flow-through
canalisation;
[0050] FIG. 22 represents a possibility for realising a nozzle
according to FIG. 21 when disassembled;
[0051] FIG. 23 represents a special embodiment of a nozzle
according to the invention;
[0052] FIG. 24 represents a view according to arrow F24 in FIG.
23;
[0053] FIG. 25 represents a view according to arrow F25 in FIG. 23
to a larger scale;
[0054] FIG. 26 represents the top end of the nozzle from FIGS. 23
to 25 in perspective;
[0055] FIG. 27 represents a section according to line XXVII-XXVII
in FIG. 25;
[0056] FIG. 28 represents a view analogous to that of FIG. 2, but
for the nozzle from FIGS. 23 to 27;
[0057] FIGS. 29 and 30 schematically illustrate an intermediate
step of a possible method for realising nozzles according to the
invention.
[0058] FIGS. 1 and 2 schematically represent a device 1 for
inserting weft threads 2 in a weaving machine, which is provided
with nozzles 3, in particular relay nozzles, realised according to
the invention.
[0059] The given device 1 comprises a slay 4 with a reed 5 fixed to
it which is provided with a guide duct 6 along which the weft
thread 2 is conveyed. The weft thread 2 is blown into the guide
duct 6 by means of a main nozzle 7 and it is further supported by
fluid jets, in this case air jets 8 which are generated via the
nozzles 3.
[0060] As is known, several main nozzles 7-7A can be provided to
bring weft threads 2 in the weaving shed as of several weft yarns
9-10.
[0061] As represented in FIG. 2, the nozzles 3 reach with their top
ends through the lower warp threads 11 into the shed 13 formed by
the lower and top warp threads 11-12 during the insertion of the
weft thread 2. The main nozzles 7-7A as well as the nozzles 3 are
fed with a fluid under pressure by means of a fluid source 14, for
example compressed air, and they are controlled in a known manner
by means of valves 15-16 or the like.
[0062] As represented in FIGS. 3 to 5, the nozzles 3 are provided
with a flow-through canalisation 17 for the fluid, in this case a
single duct, which opens into the environment via an outlet opening
18.
[0063] The invention is special in that the nozzles 3, at least
according to a first aspect of the invention and, as can be seen in
FIGS. 3 to 5, are at least partially composed of segments
19-20.
[0064] In the given example of FIGS. 3 to 5, the segments 19-20
consist of plates which are provided laterally against each other.
These plates extend in the longitudinal direction of the nozzle 3
and they are situated such that they are directed with one edge 21
towards the side 22 of the nozzle 3 in which the outlet opening 18
is situated.
[0065] The segments 19 are provided with passages 23 which, when
the whole is combined, determine the shape of the flow-through
canalisation 17 or, in other words, the inner shape of the nozzle
3.
[0066] The segments 20 form end walls which serve as sealing
elements or lids.
[0067] As explained in the introduction, the segments 19-20 can be
fixed against each other in any way whatsoever, for example by
means of welded joints 24.
[0068] The segments 19-20 can possibly be provided with auxiliary
means to mutually position the composing parts, as is schematically
represented by means of a dashed line in FIG. 5, and alternatively,
represented connecting elements 25-26 and/or mechanical coupling
elements, in particular pins 27 and holes 28. It is clear that a
large number of variants are possible.
[0069] FIGS. 6 and 7 represent a variant whereby the segments 19-20
are provided in a casing 29. In this case, the segments 19-20, or
at least specific parts thereof, can possibly be pressed loosely
against each other, whereby the casing 29 keeps the segments 19-20
together.
[0070] In the embodiments of FIGS. 3-5 and 6-7, the passages 23
extend over the entire thickness of the segments 19 concerned.
According to a variant which is represented in FIGS. 8 and 9, it is
also possible to make use of one or several segments 30, with a
passage 31 extending over only a part of the thickness of each
segment 30 concerned. Such an embodiment offers the advantage that
the wall part 32 remaining next to the passage 31 can serve as a
sealing element or partition wall without a separate segment being
required to this end. Another advantage consists in that the
material parts 33 and 34 as such remain in a fixed position in
relation to each other. Said passage 31 can also be easily formed
by means of a mechanical operation, for example by means of
milling.
[0071] FIGS. 10 to 12 represent an example of an embodiment of a
nozzle 3 according to the invention, whereby the segmented
construction is used to realise partition walls 35 in the
flow-through canalisation 17 in a simple manner from a
constructional point of view. These partition walls 35 consist of
parts 36 which are part of segments 37 provided between segments
19, so that these parts 36 also serve as longitudinal
partitions.
[0072] The parts 36 are limited by a bottom edge 38, such that,
when the segments 19-20-37 represented in FIG. 12 are joined
together, a common duct is obtained at the bottom in the nozzle 3,
and separate ducts 39-40-41 are created more towards the top, which
are situated laterally next to one another in the given example and
which extend up to the side 22 and thus define several outlet
openings 18.
[0073] Thus, it is possible to realise a separate duct towards each
outlet opening 18 and/or towards several groups of outlet openings
18, as a result of which a better guiding of the fluid flow is
obtained.
[0074] In the embodiment of FIGS. 13 to 15 is represented a variant
whereby the partition walls 35 are formed by means of segments 47
which are of the same type as the aforesaid segments 30, whereby
the wall parts 32 now function as partition walls 35.
[0075] It should be noted that the partition walls 35, in the
embodiment from FIGS. 10 to 12 as well as the one from FIGS. 13 to
15, seen crosswise, in particular according to the direction D,
extend in one piece from one side to the other side of the
flow-through canalisation 17, so that, as opposed to the use of a
partition wall which does not continue materially, as is known from
EP 0,145,824, no zones are created in which hairs or the like,
coming for example from the weft thread 2, can become jammed.
[0076] As is schematically represented in FIG. 16, the partition
walls 35, no matter in what way they are formed, preferably extend
downward up to a distance A from the outlet openings 18 concerned
which is larger than the largest hair length of the hairs 48 which
are usually found on textile fibres, in particular on a weft thread
2 or a warp thread 11-12. Thus is excluded that hairs 48 which
might penetrate can become entangled under the lower edge 38 and
fix themselves there, after they have come off the textile fibre,
and become concentrated there. The risk of hairs 48 penetrating as
of warp threads is bigger since the outlet openings 18 go through
the warp threads 11 at each insertion of a weft thread. Thus, the
risk of contamination, in particular of obstruction of the
flow-through canalisation 17 is minimised. Practically, the
distance A preferably amounts to about 1 cm or more.
[0077] Thanks to the segmented construction, it is also easy to
realise intermediate connections in the flow-through canalisation
17 which form a reinforcement for the body 49 of the nozzle 3, in
other words for the slender part thereof. FIG. 17 represents an
example thereof, whereby a partition wall 35 is also made as a
special reinforcement part. To this end, the partition wall 35
extends over the entire length L of the slender body 49, as a
result of which it functions as a reinforcement rib.
[0078] In order to obtain such a reinforcement, said partition wall
35 does not necessarily have to extend over the entire length L,
but at least one reinforcement will preferably be made in or around
the central part 50, so that the body 49 is at least reinforced in
the middle.
[0079] It should be noted that said reinforcement can possibly be
formed of local connecting ribs alone.
[0080] The aforesaid segments and possibly partition walls 35
formed thereof can serve as guiding elements, provided they have a
suitable direction or shape, to direct the fluid jet 8 leaving the
outlet opening or outlet openings 18 when using the nozzle 3. A
specific example thereof is represented in FIG. 18, which shows an
embodiment whereby the partition walls 35 consist of plate-shaped
elements or the like which extend slantingly at an angle H
according to a general direction which, when the nozzle 3 has been
mounted in a weaving machine, extends slantingly towards the reed
5.
[0081] FIGS. 19 and 20 represent some more special embodiments
which show that the segments, and in particular partition walls 35
formed thereof, may consist of elements, in particular plates or
the like, which may have a varying thickness and/or a shape which
deviates from a flat shape, as a function of the desired
effect.
[0082] FIG. 21 shows another embodiment with a partition wall 51
which is made as a cross partition, and in particular as a
blade-shaped guide near the outlet opening or outlet openings 18.
In principle, the partition wall 51 can be made as a loose segment
provided between neighbouring segments, but it is easier to make
use of a segment 52 as represented in FIG. 22.
[0083] It is clear that it is also possible to realise embodiments
by means of the above-mentioned segments having longitudinal as
well as cross partition in the flow-through canalisation 17, for
example by placing several segments 52 against one another. Thus,
it is possible to realise a nozzle 3 with a whole series of outlet
openings 18, whereby separate ducts to each outlet opening 18 are
at least formed in the head of the nozzle 3.
[0084] In the given examples, the flow-through canalisation 17
generally extends in the longitudinal direction of the nozzle 3 and
it traces a curve near the top end to finally flow into the outlet
opening or outlet openings 18. The above-mentioned partition walls
35 and 51 hereby preferably extend through at least a part of this
curve. This offers the advantage that the fluid is easily bent with
a minimal risk of unwanted turbulences being created which might
have a negative influence on the fluid jet 8.
[0085] FIGS. 23 to 28 represent a special embodiment with a nozzle
3 having a series of outlet openings 18 which are arranged in a
stepped manner, thanks to the construction in segments, as of one
far end of the series to its other far end, which results in the
advantages mentioned in the introduction.
[0086] The direction of the stepped shape is preferably selected
such that a bundle of parallel or almost parallel outgoing fluid
jets, in particular partial jets 8A is obtained, whereby the
intersections of these partial jets 8A with a theoretical plane 53
going through the guiding duct 6 and standing at right angles to
the surface of the reed 5, are all situated at practically the same
distance from the outlet openings 18, which amounts to some 50
mm.
[0087] The nozzle 3 with the step-like arranged outlet openings 18
is particularly suitable to be made with a lateral protuberance
corresponding to the invention which is described in Belgian patent
No. 1,012,608.
[0088] It should be noted that the different parts of the segments
can be held together in the right position in any way whatsoever
while being joined, until they are fixed to each other. FIG. 29
represents a practical possibility for holding two parts 19A and
19B of a segment 19 in a fixed position until this segment 19 is
connected to other segments. To this end, an additive 54 is formed
for the outlet opening 18 to be formed which connects the parts 19A
and 19B to each other, which additive 54 is removed after the
segments have been joined and fixed to each other, for example up
to the indicated line 55, by means of milling, grinding or the
like.
[0089] In this manner can also be provided a blade in a simple
manner in a nozzle formed of segments, by making use of an additive
54 as represented in FIG. 30.
[0090] All the embodiments described above by means of the figures
are applications of the aforesaid first aspect of the invention. It
is clear that, in a number of these embodiments, also one or
several of the other aspects mentioned in the introduction have
been applied. As explained in the introduction, however, the
characteristics according to the second to eighth aspect can also
be realised independently of the first aspect, as well as
independently of each other, without making use of a segmented
construction.
[0091] In the case of a segmented construction, however, it is
possible to work with mainly horizontal segments, by which are
meant segments extending mainly perpendicular to the longitudinal
direction of the nozzle.
[0092] The invention is by no means limited to the above-described
embodiments given as an example and represented in the accompanying
drawings; on the contrary, such a nozzle can be made in many sorts
of shapes and dimensions while still remaining within the scope of
the invention.
* * * * *