CN101358405B - Weft insertion nozzle and weft nozzle drop-off prevention part for weft insertion nozzle - Google Patents

Abstract

The invention provides a weft insertion nozzle and a weft-fall-out preventing component used in weft insertion nozzle, characterized in that a tubular component (51a) having a through hole (50a) and a cylindrical section (55a) is fitted within or around a thread guide (3), the cylindrical section (55a) at least having a tubular shape at one end in an axial direction thereof. Of the tubular component (51a) and the thread guide (3), the one whose inner periphery surface substantially serves as a weft guiding path (5) has a downstream end in a weft-insertion direction that is provided with a plurality of projections (11) arranged in a circumferential direction, each projection (11) being tapered from a base end (15) towards a tip thereof.

Description

Weft insertion nozzle and weft nozzle drop-off prevention part for weft insertion nozzle

technology area

The present invention relates to a weft insertion nozzle of a fluid jet loom, and more specifically relates to a technique for preventing a weft yarn from bouncing off from the weft insertion nozzle due to rebound when the weft yarn is cut (so-called nozzle shedding).

Background technique

Utility Model Publication No. Sho 51-124159 (hereinafter referred to as Patent Document 1) and Patent Publication No. Hei 11-200193 (hereinafter referred to as Patent Document 2) disclose that in a fluid jet loom, the weft yarn after beating up is prevented from falling off from the nozzle. Methods.

More specifically, the technology of Patent Document 1 is to embed a plurality of linear members such as nylon wires or metal wires in the weft insertion nozzle so as to converge on the periphery of the injection port of the weft insertion nozzle on the downstream side of the flow direction of the compressed fluid. , and assuming that the weft yarn is always in contact with the linear member, even if the weft yarn cut off from the woven fabric returns to the direction opposite to the weft insertion direction due to the rebound when the weft yarn is cut after beating up, it is hung on the linear member, This prevents the return of the weft thread.

However, according to the technology of Patent Document 1, there is a problem that weft insertion becomes unstable or the weft yarn is damaged because the weft yarn always contacts the linear member.

On the other hand, in the technique of Patent Document 2, a weft yarn gripping mechanism by air jet is provided on the upstream side of the yarn guide inside the weft insertion nozzle. The weft yarn gripping mechanism is arranged on the base body connecting the guide yarn and the nozzle main body, has an air injection hole oppositely arranged to sandwich the weft yarn path at a position between the above-mentioned guide yarn and the above-mentioned nozzle main body, and is provided with a plurality of penetrating through the above-mentioned base body. The weft yarn holding part of the through hole on the inner wall surface injects air from the air injection port at a predetermined time to press and hold the weft yarn on the weft yarn holding part, thereby preventing the weft yarn from returning when the weft yarn is cut.

However, according to the technology of Patent Document 2, a mechanism for controlling air injection is required, and the configuration is complicated. In addition, if dust stagnates in the through holes, weft yarn gripping becomes ineffective, so there are problems such as periodic cleaning is required.

[Patent Document 1] Utility Model Publication No. 51-124159

[Patent Document 2] Patent Publication No. 11-200193

Contents of the invention

Therefore, an object of the present invention is to prevent the weft yarn from being cut with a simple mechanism without impairing the stability of the weft insertion and the quality of the weft yarn even if a highly elastic weft yarn is used in the weft insertion nozzle used in a fluid jet loom. When the weft yarn falls off from the nozzle.

In addition to the above-mentioned problems, the invention of claim 1 has through holes (50a, 50b, 50c, 50d, 50e), And at least one end side in the axial direction is provided with cylindrical parts (55a, 55b, 55c, 55d, 55e) of cylindrical parts (51a, 51b, 51c, 51d, 51e), and the above-mentioned cylindrical parts are arranged. In the region of the parts (51a, 51b, 51c, 51d, 51e), the inner peripheral surfaces of the above-mentioned cylindrical parts (51a, 51b, 51c, 51d, 51e) and the yarn guide (3) substantially constitute a weft yarn guiding pipeline. The front end on the downstream side in the weft insertion direction of the member of (5) is provided with a plurality of protrusions ( 11 ) tapered as it advances from the base end ( 15 ) to the front end side in the circumferential direction.

Thereby, when cutting the weft yarn (9) after beating up, even if the weft yarn (9) on the side of the weft insertion nozzle that is cut off moves toward the upstream side of the weft insertion nozzle (1) in the pull-back direction due to its own elasticity, the weft yarn (9) Hanging on at least one ditch (41) defined by the above-mentioned plurality of protrusions (11), that is, defined by the side (16) and the base end (15) of the adjacent protrusions (11) and followed by Further movement of the weft yarn (9) can be prevented by the tapered groove portion (41) advancing toward the base end side, so-called, the weft yarn (9) can be prevented from falling out of the nozzle. Moreover, unlike the technology of Patent Document 1, the member used to prevent the pull-back protrudes from the side of the weft yarn running path and is often in contact with the weft yarn (9). The first protrusion (11) is set to protrude from the front end side (axial direction) of the yarn guide (3), so when the weft is inserted, there is no resistance to the weft yarn (9) drawn out by the fluid jet, and the weft yarn will not be damaged. (9).

Regarding the weft insertion nozzle (1) according to claim 1, specifically, the cylindrical nozzle is arranged so as to be fitted in any one of the inner side and the outer side of the front end portion (10) of the yarn guide (3). Parts (51a, 51e), and the front end (10) of the yarn guide (3) is made into a double structure in the radial direction, and the front end (10) of the above-mentioned yarn guide (3) and the above-mentioned tubular member (51a , 51e), a plurality of above-mentioned protrusions (11) are provided in the circumferential direction at the front end on the downstream side in the weft insertion direction of the inner member. (invention of claim 2)

Therefore, when cutting the weft yarn (9) after beating up, even if the weft yarn (9) cut off from the woven fabric moves toward the upstream side of the weft insertion nozzle (1) in the pull-back direction due to the elasticity of the weft yarn itself, the moving state The weft yarn (9) hangs on the protrusion (11) located at the front end of the yarn guide (3), so that the movement of the weft yarn (9) can be stopped and the weft yarn (9) can be prevented from falling off from the nozzle.

With regard to the weft insertion nozzle (1) according to claim 2, the base end (15) of the above-mentioned projection (11) is arranged to be closer than the front end (10) of the yarn guide (3) and the cylindrical member (51a, 51e). The end face (52) on the downstream side in the weft insertion direction of the outer member may be located more upstream. (invention of claim 3)

Therefore, the degree of exposure of the orifice channel (40) to the groove portion (41) formed between the plurality of protrusions (11) is reduced. As a result, the flow of air flowing from the groove (41) to the inside of the weft guide pipe (5) is suppressed. As a result, the fluid flow in the weft insertion direction is more stable, and good weft insertion and stable loom operation are realized. . Therefore, it is possible to suppress a reduction in the weft yarn conveying force of the conventional weft insertion nozzle (1).

Regarding the weft insertion nozzle (1) according to claim 2 or 3, the front end portion (10) of the yarn guide (3) forms a stepped portion (56a, 56e) to form a thin-walled portion, and the tubular member (51a, 51e) may be arrange|positioned so that it may fit in the said step part (56a, 56e). (invention of claim 4)

Thereby, the axial position of the tubular member (51a, 51e) relative to the yarn guide (3) can be defined, and the unevenness of the axial position of the tubular member (51a, 51e) when manufacturing the yarn guide (3) disappear and the defective rate of the weft insertion nozzle (1) is reduced, and the so-called yield rate is improved.

In addition, in the weft insertion nozzle (1) according to claim 1, specifically, the cylindrical member (51b, 51c, 51d) is arranged so as to fit inside the yarn guide (3), and the cylindrical member (51b, 51c, 51d) A plurality of above-mentioned protrusions (11) are provided in the circumferential direction at the front ends of the shaped members (51b, 51c, 51d) on the downstream side in the weft insertion direction. (invention of claim 5)

Therefore, when cutting the weft yarn (9) after beating up, even if the weft yarn (9) on the side of the weft insertion nozzle that is cut off from the woven fabric is pulled back toward the upstream side of the weft insertion nozzle (1) due to its own elasticity, Direction movement, the weft yarn (9) in the moving state is hung on the protrusion (11) provided at the front end of the yarn guide (3), so that the movement of the weft yarn (9) can be stopped, and the weft yarn (9) can be prevented from flowing out of the nozzle fall off.

Regarding the weft insertion nozzle (1) according to claim 2 or 5, the cylindrical member (51a, 51b, 51c, 51d) is formed as a through hole (50a, 50b, 50c, 50d) and a cylindrical shape with the same outer diameter. (invention of claim 6)

Therefore, the processing and production of the cylindrical member (51a, 51b, 51c, 51d) is easy, which is advantageous for mass production.

Regarding the weft insertion nozzle (1) according to claim 5, the cylindrical member (51c, 51d) is formed on the upstream side of the weft insertion direction from the cylindrical portion (55c, 55d) and is connected to the cylindrical member (51c, 51d). The flange portion (57c, 57d) of the portion (55c, 55d) is provided on the bottom surface (54c, 54d) extending radially outward on the yarn guide (3) so as to contact the flange portion (57c, The tubular member (51c, 51d) may be arranged so as to form an end surface on the downstream side in the weft insertion direction of 57d). (Invention of Claim 7)

Therefore, the above-mentioned cylindrical member (51c, 51d) can be easily positioned and arranged at a predetermined position in the weft guide line (5) of the above-mentioned yarn guide (3), and the cylindrical shape of the yarn guide (3) can be manufactured. The unevenness in the axial position of the parts (51c, 51d) disappears, and the defect rate of the weft insertion nozzle (1) is reduced, so the so-called yield rate is improved.

In the invention of claim 8, the nozzle drop-off prevention member (53) arranged and used so as to fit inside the yarn guide (3) of the weft insertion nozzle (1) is used as the cylindrical member (51a, 51b, 51c, 51d ), more specifically, the above-mentioned cylindrical member (51a, 51b, 51c, 51d) has a through-hole (50a, 50b, 50c, 50d) penetrating in the axial direction and at least one end side in the axial direction is aligned with the axial direction. The cylindrical part (55a, 55b, 55c, 55d) of the outer diameter, at the front end of the cylindrical part (55a, 55b, 55c, 55d), is provided in the circumferential direction with a plurality of 15) Protrusion (11) that advances toward the front end and becomes tapered.

Therefore, by attaching the nozzle drop-off prevention member (53) to the conventional yarn guide (3), the conventional yarn guide (3) can also have the function of preventing weft yarn from falling off from the nozzle.

Description of drawings

Fig. 1 is a cross-sectional view showing a peripheral portion of a weft insertion nozzle of an air-jet loom.

Fig. 2 is an enlarged cross-sectional view of a peripheral portion of a weft insertion nozzle of an air-jet loom.

Fig. 3 is a perspective view and a cross-sectional view of the front end portion 10 of the yarn guide 3 according to the embodiment of the present invention.

Fig. 4 is a developed view taken along line A-A' of Fig. 3 .

FIG. 5 is a developed view showing a modified example of the shape of the protrusion 11 .

FIG. 6 is a developed view showing a modified example of the shape of the protrusion 11 .

FIG. 7 is a developed view showing a modified example of the shape of the protrusion 11 .

FIG. 8 is a developed view showing a modified example of the shape of the protrusion 11 .

Fig. 9 is a cross-sectional view of the front end portion 10 of the yarn guide 3 according to the embodiment of the present invention.

Fig. 10 is an enlarged cross-sectional view of the periphery of the weft insertion nozzle of the air-jet loom.

In the picture:

1-weft insertion nozzle, 2-nozzle main body, 3-yarn guide, 4-insertion hole, 5-weft yarn guiding pipeline, 6-large diameter part, 7-small diameter part, 8-knitting needle part, 8a-outward guide Surface, 9-weft yarn, 10-front end, 11-protrusion, 12-hole part, 12a-inner guide surface, 13-guide tube, 14-yarn guide eye, 15-base end, 16-side part, 17-top , 20-warp, 21-opening, 22-reed, 23-cutter, 24-weaving, 25-pipeline, 26-connector, 27-circular flow channel, 28-rectification channel, 29-rectification Blade, 30-spray outlet, 31-internal thread, 32-external thread, 33-first insertion hole, 34-second insertion hole, 40-orifice flow channel, 41-groove, 42-outer peripheral surface, 43-inner peripheral surface, 50a-through hole, 50b-through hole, 50c-through hole, 50d-through hole, 50e-through hole, 51a-tubular member, 51b-tubular member, 51c-tubular member, 51d -Tube-shaped part, 51e-Tube-shaped part, 52-End surface, 53-Weft nozzle drop-off preventing part, 54a-Bottom surface, 54b-Bottom surface, 54c-Bottom surface, 54d-Bottom surface, 54e-Bottom surface, 55a-Cylindrical part, 55b-cylindrical part, 55c-cylindrical part, 55d-cylindrical part, 55e-cylindrical part, 56a-step part, 56b-step part, 56c-step part, 56d-step part, 56e- Step part, 57c-flange part, 57d-flange part

Detailed ways

The weft insertion nozzle 1 of the present invention is suitable for a fluid jet loom. Furthermore, the weft insertion nozzle 1 of the present invention can be roughly classified into two types according to the installation position of the cylindrical member of the weft nozzle drop-off preventing member 53 (claim 8), which is a characteristic part of the present invention. That is, the cylindrical member is attached to the front end portion 10 of the yarn carrier 3 (the cylindrical members 51a, 51e), and the cylindrical member is attached to any position of the weft guide duct 5 inside the yarn carrier 3. (Cylinder members 51b, 51c, 51d) Two types. Hereinafter, an example in which the cylindrical members 51a, 51e are attached to the front end portion 10 of the yarn guide 3 will be described first (FIGS. 1 to 9), and then the cylindrical members 51b, 51c, 51d will be attached to the yarn guide 3. An example of an arbitrary position of the internal weft guide duct 5 will be described (FIG. 10).

1 and 2 show the peripheral portion of a weft insertion nozzle (main nozzle) of an air jet loom in a fluid jet loom to which the present invention is applied.

The weft insertion nozzle 1 includes as main components: a nozzle main body 2 having an insertion hole 4, a yarn guide 3 inserted into the insertion hole 4, and an orifice member 12 for accelerating air as a compressed fluid, and a weft yarn 9 and The duct 13 of the hollow part where the air merges. Here, the insertion hole 4 forms a so-called through hole formed by coaxially connecting the first insertion hole 33 in which the orifice member 12 is inserted and the second insertion hole 34 in which the guide tube 13 is attached. The inner periphery near the groove portion is provided with an internal thread portion 31 for mounting the yarn guide 3 .

In addition, although metal materials are used for the material of each member, wear-resistant materials such as ceramics may be used, and each member may be manufactured by a known method such as cutting, electrical discharge machining, or forming. In the example shown here, aluminum is used for the nozzle body 2, and stainless steel is used for the yarn guide 3, the orifice member 12, and the guide tube 13.

The yarn guide 3 has a weft yarn guide line formed in the inside thereof so that the inner diameter is reduced as it advances from the vicinity of the entrance to the central part in the axial direction, and then the inner diameter is maintained at the same diameter, and the weft yarn 9 is penetrated in the axial direction. 5. In addition, on the outside, from the vicinity of the entrance to the axial direction, there are: a large-diameter portion 6 having an external thread portion 32 fitted to the internal thread portion 31 of the insertion hole 4, and a small-diameter portion 6 formed on the downstream side in the weft insertion direction. part 7, and its outer diameter is reduced as it progresses toward the downstream side in a part of the section on the downstream side, and is connected to the knitting needle part 8 at the front end of the downstream side, and between the small diameter part 7 and the knitting needle part 8 , a plurality of straightening blades 29 extending radially outward in the radial direction are formed, and a straightening channel 28 is formed between two adjacent straightening blades 29 .

The yarn guide 3 is inserted into the first insertion hole 33 of the nozzle main body 2, and is installed so as to maintain an airtight state by screwing the internal thread portion 31 and the external thread portion 32. 8 and the space surrounded by the insertion hole 4 (first insertion hole 33 ) of the nozzle body 2 constitutes an annular flow path 27 . In addition, a connector 26 for connecting the pipeline 25 is attached to the nozzle main body 2 , and an unillustrated flow path communicating with the pipeline 25 and the annular flow path 27 is provided from a pressure fluid source (not shown). In addition, the pipeline 25 is connected to the output end of the unillustrated electromagnetic control valve that controls the fluid from the pressure fluid source, and when the weft insertion time is reached, the compressed air (air) passes through the connector 26 from the The pipeline 25 flows into the annular flow channel 27, and after that, the compressed air (air) is rectified by the rectifying vane 29 of the rectifying flow channel 28, and passes through the outer guide surface 8a of the knitting needle part 8, the first insertion hole 33, and the orifice member. 12 is accelerated by the orifice channel 40 defined by the inner surface 12a, and is ejected from the ejection port 30.

On the other hand, the weft yarn 9 inserted into the weft guide pipeline 5 from the yarn guide eye 14 is drawn out from the yarn guide 3 by the negative pressure of the air ejected from the injection port 30, and flows through the hollow portion of the conduit 13. The air merges and is ejected from the groove portion of the duct 13 together with the air. The ejected weft yarn 9 is inserted into the opening 21 of the warp yarn 20 , beaten up by the reed 22 , and separated from the fabric 24 by the cutter 23 . In addition, the yarn guide eye 14 provided at the entrance of the weft guide duct 5 of the yarn guide 3 has a guide surface with a smaller diameter than the inner diameter of the entrance of the weft guide duct 5, and is made of, for example, a wear-resistant material such as mailglass. Made of materials.

Further, the downstream end portion 10 of the yarn guide 3 is fitted with a cylindrical member 51a which is a characteristic part of the present invention, and a plurality of protrusions 11 are provided in the circumferential direction at the front end of the cylindrical member 51a. In addition, in FIG. 2 , an example is shown in which the tubular member 51a is fitted inside the front end portion 10 of the yarn guide 3, and the front end portion 10 of the yarn guide 3 is double-structured in the radial direction, but it may also be as follows: As shown in (c) of FIG. 9 , the tubular member 51e is fitted outside the front end portion 10 of the yarn guide 3, and the front end portion 10 of the yarn guide 3 has a double structure in the radial direction. In any case, the members on the inside of the cylindrical members 51a, 51e and the front end portion 10 of the yarn guide 3, that is, the inner peripheral surfaces of the cylindrical members 51a, 51e and the yarn guide 3 substantially constitute weft guides. The front end on the downstream side of the weft insertion direction of the components of the pipeline 5 is provided with a plurality of above-mentioned protrusions (11) in the circumferential direction.

(a) and (b) of Fig. 3 show an example in which the cylindrical member 51a is fitted inside the front end portion 10 of the yarn guide 3, and the protrusion 11 is provided at the front end of the cylindrical member 51a. The cylindrical member 51 a is formed in a cylindrical shape having a through-hole 50 a having the same inner diameter and a cylindrical portion 55 a having an outer shape having the same outer diameter across the entire length in the axial direction. In addition, a plurality of protrusions 11 tapered as it goes from the base end 15 toward the front end side are provided in the circumferential direction at the front end on the downstream side in the weft insertion direction of the tubular member 51a. The plurality of protrusions 11 are arranged at regular intervals in the circumferential direction according to the following conditions, and grooves 41 are formed between adjacent protrusions 11 . The weft yarn 9 pulled back to the upstream side when the beat-up weft yarn is cut is caught by at least one of the grooves 41 . The plurality of protrusions 11 are integrally formed with the tubular member 51a by cutting the downstream end of the tubular member 51a in the weft insertion direction by a known method such as electrical discharge machining.

On the other hand, in the front end portion 10 of the yarn guide 3, a stepped portion 56a is provided inside to form a thin portion, and it is formed in a stepped shape having a bottom surface 54a facing the downstream side. Moreover, the cylindrical member 51a has an outer diameter fitted to the inner circumference of the thin portion of the yarn guide 3, and the cylindrical member 51a is arranged so that the end surface on the upstream side in the weft insertion direction contacts the bottom surface 54a, and is fitted in the yarn guide 3. The inside step portion 56a. When the inner diameter of the through-hole 50a provided in the cylindrical member 51a is the same as the inner diameter of the weft guide duct 5 at the front end portion 10 of the yarn guide 3, the two inner peripheral surfaces are continuous, so that there is no resistance when the weft yarn 9 is pulled out, so it is ideal. . However, if the level difference is small, the resistance during weft insertion is small, and there is no great influence. In addition, the inner peripheral surface of the through hole 50a of the cylindrical member 51a communicates with the weft guide duct 5 of the yarn guide 3, and the weft guide duct 5 is substantially formed in the front end portion 10 of the yarn guide 3.

In addition, the cylindrical member 51a is arranged such that the base end 15 of the protrusion 11 is located on the upstream side of the end surface 52 of the front end portion 10 of the yarn guide 3 on the downstream side in the weft insertion direction with respect to the yarn guide 3 . Accordingly, the degree of exposure of the groove portion 41 to the orifice flow channel 40 can be further suppressed. Thereby, can suppress because of the airflow accelerated by the orifice flow channel 40, from the groove part 41 that is formed between a plurality of protrusions 11 leaks to the flow of the airflow inside the weft yarn guide pipeline 5, therefore, the flow of the weft insertion direction The airflow is stably formed to realize stable weft insertion, and it is possible to prevent a decrease in the weft yarn conveyance force of the weft insertion nozzle 1 .

Next, focusing on one of the protrusions 11, the protrusion 11 is machined by planing the front end on the downstream side in the weft insertion direction of the cylindrical member 51a from the front end to the length H in the axial direction according to a known method such as electric discharge machining. At this time, the base end 15 is formed on the bottom surface formed in the circumferential direction, and the top 17 protruding in a tapered shape in the circumferential direction as it proceeds from the base end 15 to the front end side has a length a in the circumferential direction. Regarding the shape of the projection 11, more specifically, it consists of the side portion 16 connected to the two faces of the base end 15 as the bottom surface, and the planar top 17 connected to the front end thereof, and continuously extending from the upstream side of the weft insertion direction. The inner peripheral surface of the through hole 50a and the outer peripheral surface of the cylindrical portion 55a, and connected to the inner peripheral surface 43 and the outer peripheral surface 42 of the side portion 16 and the top 17, formed by the opposite side portion 16 and the base end The space divided by 15 forms the groove portion 41 communicated with the weft guide pipeline 5. In addition, four or more protrusions 11 are arranged, and it is preferable that they are arranged at intervals of 6 to 30 in the circumferential direction as the most suitable structure for catching the weft yarn 9 . At this time, the distance between the front ends of the adjacent protrusions 11 is such that the used weft yarn 9 can enter the groove portion 41 provided between the adjacent protrusions 11 .

As for the size of the front end of the actual cylindrical member 51a, the inner radius r1 is 1 to 2 mm, which is preferably the same as the inner diameter of the weft guide duct 5 of the yarn guide 3 . In addition, the thickness t1 is not more than the thickness of the yarn guide 3, specifically, 0.2 to 0.5 mm. Furthermore, the number of protrusions 11, the pitch P of the protrusions 11, the length a in the circumferential direction of the top 17 of the protrusion 11, and the height (the distance between the top 17 and the base end 15) H of the protrusions 11 are determined by the length of the cylindrical member 51a. The inner radius r1, the thickness t1, and the thickness of the used weft yarn determine the most suitable value for catching the weft yarn 9 . However, in order to sufficiently obtain the effects of the present invention, the following conditions obtained empirically are satisfied.

(1) The length a of the protrusion 11 in the circumferential direction is set to be equal to or less than the thickness t1 of the front end of the cylindrical member 51 a. Thereby, when cutting the weft yarn after beating up, when the weft yarn 9 is drawn back to the upstream side, it can more surely enter at least one groove portion 41, so the so-called nozzle drop-off can be reliably prevented. In addition, if the length a in the circumferential direction is set to be smaller, it is also possible to prevent the pulled weft yarn 9 from bouncing at the top 17 .

(2) The height H of the protrusion 11 is made smaller than the inner radius r1 of the front end of the cylindrical member 51a. In addition, if the height H is made larger than the thickness t1, the drawn weft yarn 9 can be hung on at least one groove portion 41 more reliably, which is desirable.

(3) When the pitch P of the protrusions 11 is substantially the same as or larger than the thickness t1 of the tip of the cylindrical member 51 a, it is empirically more preferable in terms of the effect of the present invention.

Considering these conditions comprehensively, as a result of determining the length a, the height H, and the pitch P, it is found that in the present invention, it is appropriate to set the number of protrusions 11 at 6 to 30. If the number is five or less, the intervals between the protrusions 11 (that is, the grooves 41 ) will be too wide, and the weft yarn 9 will fall off, so that the effect of the present invention cannot be sufficiently obtained. In addition, if the number is more than 31, the intervals of the protrusions 11 are too narrow, so that the weft yarn 9 that can be inserted in the current fluid jet loom is difficult to catch, and the effect of the present invention cannot be fully obtained. However, the number of protrusions 11 can vary to some extent depending on the kind of weft yarn to be used, the size of the yarn guide 3, and the like.

In addition, in this example, the outer peripheral surface 42 and the inner peripheral surface 43 connected to the side portion 16 extend from the base end 15 side to the top 17 with the same thickness, however, in order to prevent the air flow from being scattered, the thickness may be formed to vary according to the thickness. Thinning as it progresses toward the front. In addition, the angle α formed by the opposing side portions 16 of two adjacent protrusions 11 is determined by the type of weft yarn 9 used, the dimensions (r1, t1) of the front end portion 10, and the above-mentioned conditions (1) to (3). , but usually best below 90° (the so-called acute angle, preferably below 45°).

Fig. 4 is a developed view showing the shape of the protrusion 11 in A-A' of Fig. 3 . 5 to 8 show modified examples of the shape of the protrusion 11 . In FIG. 5 , the front end portion of the triangular wave-shaped protrusion is pointed (a=0), and the base end portion (bottom) is formed into a flat surface. With such a shape, compared with when the top 17 is flat ( FIG. 4 ), the returned weft yarn 9 does not collide with the flat surface of the top 17 , and it is easier to guide the weft 9 into the base end. In FIG. 6 , the base end portion of the protrusion 11 in FIG. 5 is formed as a V-shaped groove (so-called straight bottom). Such a shape can expect the effect of clamping and holding the returned weft yarn 9 in the V-shaped groove portion, and can further prevent the nozzle from coming off. In FIG. 7 , the protrusion 11 is set in a saw wave shape, which has the above-mentioned advantages of the shapes in FIGS. 5 and 6 . FIG. 8 shows that the pointed protrusions 11 are formed by partition walls provided with the carved U-shaped grooves interposed therebetween.

FIG. 9 shows another example of the present invention in which a cylindrical member is fitted into the front end portion 10 of the yarn guide 3 . Fig. 9(a) is an example in which the inside of the front end portion 10 of the yarn guide 3 is not formed into a stepped shape but straight (cylindrical) and the cylindrical member 51a is fitted therein. In order not to damage the weft yarn 9 in the flying state, it is preferable to chamfer the end surface on the upstream side in the weft insertion direction of the tubular member 51a.

(b) of FIG. 9 is an example in which the top 17 of the protrusion 11 provided at the front end of the cylindrical member 51a is located on the upstream side in the weft insertion direction relative to the end surface 52 of the yarn guide 3 . In this example, the outer member of the double structure (the yarn guide 3 in this example) completely covers the protrusion 11 from the outside, so the protrusion 11 (groove 41 ) is not exposed to the orifice flow path 40 . As a result, the flow of the air flow leaking from the groove portion 41 to the inside of the weft guide duct 5 can be completely suppressed, so as a result, the flow of the fluid in the weft insertion direction is more stable, and the weft insertion is stable, so that the weft insertion nozzle 1 can be prevented. Reduced weft conveying force enables more stable operation with fewer weft stops. In addition, the offset amount t3 with respect to the end surface 52 of the top part 17 is about several millimeters, specifically, it is preferable that it is 0.1 mm or more and 5 mm or less. In addition, the same effect can be expected even if the top 17 and the end surface 52 are positioned on the same plane without shifting.

(c) of FIG. 9 is an example in which the tubular member 51e is fitted into the front end portion 10 of the yarn guide 3, and the front end portion 10 of the yarn guide 3 has a double structure in the radial direction. In this example, a protrusion 11 is provided at the front end of the yarn guide 3 which is a member inside the double structure. In addition, a stepped portion 56e is formed on the outer side of the front end portion 10 of the yarn guide 3 to constitute a thin portion, and the cylindrical member 51e has an inner diameter fitted on the outer side of the stepped portion 56e. In addition, the cylindrical member 51e has substantially the same outer diameter as the outer diameter before the upstream side of the step portion 56e of the yarn guide 3, so that the cylindrical member 51e substantially functions as the front end portion 10 of the yarn guide 3. It works, even if it reaches the area where the cylindrical member 51e is provided, the airflow accelerated by the orifice flow path 40 on the upstream side will not be disturbed, and it is more preferable in terms of stabilizing the weft insertion. In addition, the cylindrical member 51e is arranged so that the base end 15 of the protrusion 11 is located on the upstream side of the yarn guide 3 rather than the end surface 52 of the cylindrical member 51e on the downstream side in the weft insertion direction. Moreover, in this example, if the top 17 of the protrusion 11 provided at the front end of the yarn guide 3 is positioned more upstream in the weft insertion direction than the end surface 52 of the cylindrical member 51e, or on the same plane, it can be expected that The same effect as the example of FIG. 9( b ).

In addition, the attachment of the cylindrical member 51a and the cylindrical member 51e to the front end portion 10 of the yarn guide 3 may be carried out by press-fitting, bonding, attaching by screws, or the like. For example, if the external thread portion is processed on the cylindrical member 51a, the internal thread portion is processed on the front end portion 10 of the yarn guide 3, and the axial relative relationship between the cylindrical member 51a and the front end portion 10 of the yarn guide 3 can be adjusted. position, the axial position of the protrusion 11 can be adjusted according to the type of yarn, the shape of the yarn, and the like.

The above is an example of attaching the cylindrical member to the front end portion 10 of the yarn guide 3 . Next, an example in which the cylindrical member is mounted inside the yarn guide 3 will be described.

In FIG. 10, three kinds of cylindrical members 51b, 51c, and 51d are respectively arranged to be fitted inside the yarn guide 3. The front ends on the downstream side in the weft insertion direction of the portions 55b, 55c, and 55d) are provided with a plurality of protrusions 11 in the circumferential direction. In addition, in FIG. 10 , all three types of cylindrical members are attached to the yarn guide 3 , but any one of these types of cylindrical members may be attached, or two or more types of them may be appropriately combined. In addition, the cylindrical member is attached to an arbitrary position in the area where the weft guide duct 5 is provided. The number of protrusions 11, the pitch P of the protrusions 11, the length a of the top 17 of the protrusions 11 in the circumferential direction, the height of the protrusions 11 (the distance between the top 17 and the base end 15) H, and the installation of the cylindrical member on the guide The example of the front end portion 10 of the yarn device 3 is similarly determined by the inner radius r1, thickness t1, thickness of the used weft yarn, etc. of the tubular members 51b, 51c, 51d, etc., to determine the most suitable value for catching the weft yarn 9.

First, the cylindrical member 51b of the first embodiment is arranged as the weft guide duct 5 fitted inside the yarn guide 3 in the region where the small-diameter portion 7 of the yarn guide 3 is provided. The cylindrical member 51b is formed to have a conical hole with a large diameter on the upstream side of the weft insertion direction, and a through hole 50b located on the downstream side of the conical hole in the weft insertion direction and having the same inner diameter in the axial direction. The cylindrical shape of the cylindrical part 55b of the external diameter of the same.

On the other hand, in the region where the small-diameter portion 7 of the yarn guide 3 is provided, the weft guide pipe 5 inside it is formed with an inner peripheral surface having an inner diameter D2 and maintaining the same diameter in the axial direction, and has a With respect to the step-shaped portion 56b of the bottom surface 54b on the inlet side, the weft guide duct 5 located further downstream is set to have an inner diameter D1 that is substantially smaller than the inner diameter D2. The cylindrical member 51b is arranged on the bottom surface 54b in a state of being in contact with the end surface (top 17 of the protrusion 11 ) on the downstream side in the weft insertion direction, and is positioned with respect to the axial direction. The cylindrical member 51b has an outer diameter that fits on the inner peripheral surface of the inner diameter D2 of the step-shaped portion 56b, and on the other hand, has a through hole 50b having an inner diameter d1 smaller than the inner diameter D1 of the weft guide duct 5 and is almost formed. For cylindrical shape. In addition, the cylindrical member 51b is provided with a conical surface that gradually decreases in diameter toward the inner diameter d1 as it advances from the inlet portion to the downstream side for guiding the weft yarn 9, and its end portion is set to connect the inner peripheral surface of the inner diameter d1 (the weft yarn Guide line 5).

In the proximal end portion 15 on the downstream side of the cylindrical member 51b, there are provided a plurality of protrusions 11 tapered further toward the distal end side in the circumferential direction. The inner peripheral surface and the conical surface of the through hole 50b of the cylindrical member 51b communicate with the weft guide duct 5 of the yarn guide 3, and a part of the small diameter portion 7 of the yarn guide 3 substantially constitutes the weft guide duct 5. And, the top of the protrusion 11 at the front end of the cylindrical member 51b is exposed to the weft guide duct 5 on the downstream side in a region with a smaller diameter than the inner diameter D1 of the weft guide duct 5, so that the weft yarn 9 can enter the adjacent protrusion 11. ditch between.

Next, the cylindrical member 51c of the second embodiment is arranged so as to fit into the weft guide duct 5 inside the region where the large diameter portion 6 of the yarn guide 3 is provided. The cylindrical member 51c has a conical hole with a large diameter from the upstream side of the weft insertion direction, which decreases toward the inner diameter d2 as it advances to the downstream side, and a conical hole located on the downstream side of the weft insertion direction of the conical hole, which has the same inner diameter d2 in the axial direction. The through-hole 50c, and the cylindrical portion 55c having the same outer diameter and having a plurality of protrusions 11 extending in a tapered shape from the base end portion 15 to the front end side in the circumferential direction, and the cylindrical portion 55c It is located on the upstream side in the weft insertion direction, has a larger diameter than the cylindrical portion 55c, and is connected to the flange portion 57c of the cylindrical portion 55c.

On the other hand, the weft guide duct 5 inside the area where the large-diameter portion 6 of the yarn guide 3 is provided has a bottom surface 54c extending radially outward, and is formed with a bottom surface 54c that is maintained at the same level as the upstream side from the inlet portion. The step-shaped portion 56c of the inner diameter is located on the downstream side of the region where the bottom surface 54c is provided, and a conical weft guide duct 5 having a smaller diameter and gradually decreasing in diameter through the inner diameter D2' as it goes downstream is formed. The flange part 57c of the cylindrical member 51c is arrange|positioned so that the end surface on the downstream side in the weft insertion direction may contact the bottom surface 54c, and is positioned with respect to the axial direction. The inner peripheral surface of the through hole 50c of the cylindrical member 51c communicates with the weft guide duct 5 of the yarn guide 3, and substantially constitutes the weft guide duct 5 in a part of the large-diameter portion 6 of the yarn guide 3.

In addition, the cylindrical portion 55c extending downstream in the weft insertion direction from the flange portion 57c has an outer diameter and an inner diameter d2 smaller than the inner diameter D2' of the weft guide duct 5, and extends downstream with the same diameter. The base end portion 15 of the front end is provided with a plurality of protrusions 11 that are more tapered toward the front end than the base end portion in the circumferential direction. Therefore, from the relationship of the above-mentioned inner diameter, the grooves 41 provided by the plurality of protrusions 11, in other words, adjacent protrusions 11, are arranged so as to be exposed on the inside of the weft guide pipe 5 in the circumferential direction as a whole, whereby the weft yarn 9 can be cut when the weft yarn is cut. It enters the groove 41 between adjacent protrusions 11 .

Next, the cylindrical member 51d of the third embodiment is arranged so as to fit in the opening of the weft guide duct 5 of the yarn feeder 3 on the upstream side in the weft insertion direction. In this example, the cylindrical member 51d also functions as the yarn guide eye 14 for guiding the weft yarn to the center of the weft yarn guiding duct 5 in addition to the function of preventing the weft yarn nozzle from falling off. The cylindrical member 51d has a circular through-hole 50d with an opening on the upstream side in the weft insertion direction with the same inner diameter in the axial direction, and has an outer diameter that fits on the inner peripheral surface of the inner diameter D3 of the yarn guide. The direction has a cylindrical portion 55d with a plurality of tapered protrusions 11 extending downstream from the base end portion 15 of its front end, and the cylindrical portion 55d is located on the upstream side in the weft insertion direction and connected to the cylindrical portion 55d. The flange portion 57d of the shaped portion 55d.

On the other hand, at the upstream end of the weft guide pipe 5 of the yarn guide 3 in the weft insertion direction, a step-shaped portion having a bottom surface 54d extending radially outward is provided, and the cylindrical member 51d wraps the flange portion The end surface on the downstream side in the weft insertion direction of 57d contacts the bottom surface 54d and is positioned with respect to the axial direction. The through-hole 50d of the cylindrical member 51d is provided as an inner peripheral surface having the same inner diameter d3, and at the same time communicates with the weft guide line 5 of the yarn guide 3, and at the opening of the large-diameter portion 6 of the yarn guide 3, substantially Constitutes the weft thread guide pipe 5. The outer diameter of the cylindrical portion 55d of the cylindrical member 51d is set to be smaller than the inner diameter D3 of the weft guide duct 5, and the plurality of protrusions 11, in other words, the grooves 41 provided by the adjacent protrusions 11 are formed in the entire circumferential direction. The weft yarn 9 is exposed inside the weft yarn guide duct 5, so that the weft yarn 9 can enter the groove 41 between the adjacent protrusions 11 when the weft yarn is cut.

In addition, the inner diameters D1, D2', and D3 of the weft guide duct 5 before the downstream side in the weft insertion direction of the region where the cylindrical members 51b, 51c, and 51d are arranged are set to be smaller than those of the cylindrical members 51b, 51c, and 51d, respectively. The inner diameters d1, d2, and d3 of the through holes 50b, 50c, and 50d are larger. According to the above-mentioned inner diameter relationship (D1>d1, D2'>d2, D3>d3), the protrusions 11 (tops 17, grooves 41) of the cylindrical members 51b, 51c, 51d are exposed to the weft guide duct 5, so even if Even if the weft yarn 9 moves upstream in the weft insertion direction, it is surely caught in at least one groove portion 41 between the adjacent protrusions 11, and the weft yarn 9 can be reliably prevented from falling out of the nozzle.

In addition, if the inner diameters d1, d2 of the through-holes 50b, 50c of the cylindrical members 51b, 51c are set to the minimum inner diameter of the weft yarn guide line 5 of the yarn guide 3, the weft yarn 9 to be returned is caught on the protrusion 11 (groove). Part 41) the odds are higher and favorable.

The present invention is not limited to the weft insertion nozzle of an air-jet loom, the main nozzle which is installed integrally with the sley and injects the weft yarn into the opening of the warp yarn. For example, it is also applicable to the auxiliary main nozzle which is provided on the upstream side and feeds the weft yarn to the downstream side. In addition, it can also be applied to weft insertion nozzles of water jet looms.

Claims (7)

1. a Weft insertion nozzle (1), it is the Weft insertion nozzle (1) of fluid jet type weaving machine, comprise have patchhole (4) nozzle body (2) and be inserted into the thread-carrier (3) of above-mentioned patchhole (4), above-mentioned thread-carrier (3) has the weft yarn guiding pipeline (5) of perforation, on the other hand, an end that is set as above-mentioned thread-carrier is entrenched in above-mentioned patchhole (4), simultaneously, be provided with its external diameter in wefting insertion direction downstream along with before the side downstream and then the knitting needle portion (8) that dwindles, compressed fluid is supplied with in space between the above-mentioned patchhole (4) of the knitting needle portion (8) of thread-carrier (3) and nozzle body (2), penetrate and inserted the weft yarn (9) that leads in weft yarn guiding pipeline (5), it is characterized in that

Have through hole (50a, 50b, 50c, 50d, 50e) and possess an axial at least distolateral cartridge (51a, 51b, 51c, 51d, 51e) that is set as cylindric (55a, 55b, 55c, 55d, 55e) of tubular, be configured to be entrenched in the inboard of above-mentioned thread-carrier (3) and the either party in the outside, simultaneously

Dispose in the zone of above-mentioned cartridge (51a, 51b, 51c, 51d, 51e), inner peripheral surface constitutes the parts of weft yarn guiding pipeline (5) in fact in above-mentioned cartridge (51a, 51b, 51c, 51d, 51e) and thread-carrier (3), at wefting insertion direction downstream front end, be provided with a plurality of being set as along with from cardinal extremity (15) distolateral advancing and be the projection (11) of tapered forward in circumferencial direction.

2. Weft insertion nozzle according to claim 1 (1) is characterized in that,

By disposing above-mentioned cartridge (51a, 51e) with the inboard of the leading section (10) that is entrenched in above-mentioned thread-carrier (3) and the mode of the either party in the outside, and the leading section (10) of thread-carrier (3) is made as dual structure in radial direction, in the leading section (10) of above-mentioned thread-carrier (3) and above-mentioned cartridge (51a, 51e),, be provided with a plurality of above-mentioned projections (11) in circumferencial direction in the wefting insertion direction downstream front end of the parts of inboard.

3. Weft insertion nozzle according to claim 2 (1) is characterized in that,

The cardinal extremity (15) of above-mentioned projection (11) more is positioned at upstream side than the end face (52) in the wefting insertion direction downstream of the parts in the outside in the leading section (10) of thread-carrier (3) and the cartridge (51a, 51e).

4. according to claim 2 or 3 described Weft insertion nozzles (1), it is characterized in that,

Leading section (10) in above-mentioned thread-carrier (3) forms end difference (56a, 56e) and constitutes thinner wall section, simultaneously, disposes above-mentioned cartridge (51a, 51e) in the mode that is entrenched in above-mentioned end difference (56a, 56e).

5. Weft insertion nozzle according to claim 1 (1) is characterized in that,

Mode with the inboard that is entrenched in thread-carrier (3) disposes above-mentioned cartridge (51b, 51c, 51d), at the wefting insertion direction downstream of above-mentioned cartridge (51b, 51c, 51d) front end, is provided with a plurality of above-mentioned projections (11) in circumferencial direction.

6. according to claim 2 or 5 described Weft insertion nozzles (1), it is characterized in that,

Above-mentioned cartridge (51a, 51b, 51c, 51d) forms across axial total length, profile cylindric with the through hole (50a, 50b, 50c, 50d) of same internal diameter and same external diameter, simultaneously, above-mentioned cartridge (51a, 51b, 51c, 51d) is configured in the inboard of above-mentioned thread-carrier (3).

7. Weft insertion nozzle according to claim 5 (1) is characterized in that,

At above-mentioned cartridge (51c, 51d), be formed with than above-mentioned cylindric (55c, 55d) and more be positioned at wefting insertion direction upstream side and be connected in the flange part (57c, 57d) of above-mentioned cylindric (55c, 55d), simultaneously, above-mentioned cartridge (51c, 51d) is in the mode of the end face in the wefting insertion direction downstream that contacts above-mentioned flange part (57c, 57d), be configured in the weft yarn guiding pipeline (5) of being located at above-mentioned thread-carrier (3), to bottom surface (54c, 54d) that radial direction extends.

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