CN116180306A - Weft yarn conveying nozzle in air jet loom - Google Patents

Abstract

The object is to provide a weft delivery nozzle in an air-jet loom, which can make the air injection pressure for making the weft reach the target position at the target position arrival time constant between a plurality of machines. The weft delivery nozzle has: a yarn guide (53), which has a weft passage (53d) for introducing and guiding the weft yarn (21); An air flow path (55) is formed for allowing air to flow in the direction of the weft passage. In addition, the air flow path is extended to overlap with the pulling passage (52d) on the downstream side of the weft passage, the cross section of the weft passage in the yarn guide is circular, and a plane oblique to the central axis (L) of the weft passage ( S) Cutting the end portion (53c) of the yarn guide. Furthermore, the yarn guide has a positioning portion (53g) that shows a direction corresponding to a normal direction of the plane at a portion exposed from the nozzle body.

Description

Weft delivery nozzles in air-jet looms

technical field

The invention relates to weft delivery nozzles in air-jet looms.

Background technique

As a weft delivery nozzle that ejects a weft yarn by jetting air to a weft delivery path inlet of a textured reed of an air-jet loom, for example, a weft delivery nozzle described in Patent Document 1 is known. In this weft delivery nozzle, the cross section of the weft passage in the yarn guide is circular, and the end portion of the yarn guide is formed in a shape cut along a plane oblique to the central axis of the weft passage.

Patent Document 1: Japanese Unexamined Patent Publication No. 2003-20543

However, in the weft delivery nozzle described in Patent Document 1, the inventors' studies revealed that the air injection pressure used to make the weft inserted by the weft delivery nozzle reach the target position at the target position arrival time depends on the installation position of the yarn guide. Vary with different. Therefore, there is a problem that the air injection pressure optimized for a specific machine cannot be guaranteed to be optimal for other machines in which the yarn guides are installed at different positions.

Contents of the invention

The present invention was made in order to solve the above-mentioned problems, and an object of the present invention is to provide a weft yarn delivery nozzle in an air jet loom capable of making the air injection pressure for making the weft yarn reach the target position at the target position arrival timing constant among a plurality of machines

The weft delivery nozzle in the air-jet loom according to the present invention is the weft delivery in the air-jet loom that ejects the weft yarn to the weft delivery path by injecting air toward the entrance of the weft delivery path of the deformed reed having the weft yarn delivery path A nozzle comprising: a yarn guide having a weft passage for introducing and guiding a weft yarn; and a nozzle main body for accommodating the yarn guide and forming an air flow path along the outer peripheral surface of the yarn guide to allow air to flow in the direction of the weft passage , in the weft delivery nozzle in the air-jet loom, the air flow path is extended to overlap with the weft path on the downstream side of the weft path, the cross section of the weft path in the yarn guide is circular, and the central axis of the weft path is utilized The oblique surface cuts the end portion of the yarn guide, and the yarn guide has a display portion at a portion exposed from the nozzle body, and the display portion displays a direction corresponding to a normal direction of the surface.

In addition, when the display portion is positioned horizontally and in the front direction of the air-jet loom, the normal direction of the surface may be horizontal and away from the direction of the deformed reed. In addition, when the display part is located in the horizontal direction and in the front direction of the air-jet loom, the display part may be formed so that the normal direction of the surface becomes the horizontal direction and the direction close to the deformed reed.

According to the present invention, the weft delivery nozzle in the air-jet loom includes: a yarn guide having a weft passage for introducing and guiding the weft yarn; The air flow path flowing in the direction of the weft path is extended so that the air flow path overlaps with the weft path on the downstream side of the weft path in the weft delivery nozzle in the air jet loom so that the cross section of the weft path in the yarn guide becomes circular, cut the end portion of the yarn guide with a surface oblique to the central axis of the weft passage, the yarn guide has a display portion that displays a direction corresponding to the normal direction of the surface at a portion exposed from the nozzle body, Therefore, the air injection pressure for bringing the weft yarn to the target position at the target position arrival timing can be made constant among the plurality of machines.

Description of drawings

Fig. 1 is a schematic diagram of an air-jet loom according to Embodiment 1 of the present invention.

Fig. 2 is a plan sectional view of a main nozzle according to Embodiment 1 of the present invention.

Fig. 3 is a perspective view showing an end portion of a flow path forming portion of the yarn guide shown in Fig. 2 .

Fig. 4 is a side view of the yarn guide shown in Fig. 2 viewed from the upstream side along the central axis.

Fig. 5 is a side view of the weft yarn traveling path of the deformed reed shown in Fig. 1 viewed from the upstream side.

Fig. 6 is a graph showing the relationship between the yarn carrier angle R and the air pressure.

7 is a plan sectional view of a main nozzle according to Embodiment 2 of the present invention.

Fig. 8 is a side view of the yarn guide shown in Fig. 7 viewed from the upstream side along the central axis.

9 is a plan sectional view showing a positioning portion of a ring portion according to a first modification.

Fig. 10 is a side view of the wheel shown in Fig. 9 .

11 is a plan sectional view showing a positioning portion of a ring portion according to a second modification.

Fig. 12 is a side view of the wheel shown in Fig. 11 .

Fig. 13 is a plan sectional view of a terminal portion according to a third modification.

Fig. 14 is a plan sectional view of a terminal portion according to a fourth modification.

Explanation of reference signs

21...weft yarn; 30...deformed reed; 31...weft yarn traveling path; 51...nozzle main body; 52d...traction path (weft yarn path); 53...yarn guide; 53c. ..end portion; 53d...weft passage; 53g, 53i, 53j...positioning section; 55...air flow path; 100...air-jet loom; D1...circumferential surface (diagonal surface ); D2...circumferential surface (oblique surface); L...central axis; M...normal line; S...plane (oblique surface).

Detailed ways

Implementation mode 1.

Hereinafter, the air jet loom according to Embodiment 1 of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic diagram of an air-jet loom according to Embodiment 1. The air jet loom 100 is provided with a yarn feeding device 20, an accumulating drum 22 for accumulating the weft yarn 21 drawn out from the yarn feeding device 20, and a weft insertion device for inserting the weft yarn 21 to the deformed reed 30 on the downstream side of the accumulating drum 22. 40. A solenoid pin 23 for releasing or locking the weft yarn 21 from the storage drum 22 and a balloon sensor 24 for detecting release of the weft yarn 21 from the storage drum 22 are provided on the downstream side of the storage drum 22 .

The weft insertion device 40 is provided with a tandem nozzle 60 and a main nozzle 50 . The tandem nozzle 60 and the main nozzle 50 spray compressed air (air) supplied from the air tank 41 . In addition, a solenoid valve (not shown) is provided in the tandem nozzle 60 and the main nozzle 50 , and the injection of air and the stop of the injection of air are switched by opening and closing of the solenoid valve. The tandem nozzle 60 draws out the weft yarn 21 from the storage drum 22 by injecting air, and injects the yarn 21 toward the main nozzle 50 provided on the downstream side.

The main nozzle 50 sprays the weft yarn 21 injected from the tandem nozzle 60 toward the inlet of the weft yarn traveling path 31 of the deformed reed 30 . Along the weft yarn traveling path 31 of the deformed reed 30, a plurality of solenoid valves connected to the sub-tank 35, that is, sub-nozzle valves 34 and sub-nozzles 32 connected to the sub-nozzle valves 34 are arranged respectively. The sub-nozzle 32 injects air by opening and closing the sub-nozzle valve 34, thereby moving the weft yarn 21 along the weft yarn traveling path 31 from the side where the main nozzle 50 is provided, that is, the upstream side of the left end of the air-jet loom 100 in FIG. 1 . The downstream side of the right end conveys. In addition, the main nozzle constitutes a weft delivery nozzle.

On the right end side of the deformed reed 30, an RH sensor 12 for detecting the running state of the weft yarn is provided. The RH detector 12 is connected to the main control device 11 of the air jet loom 100 . The main controller 11 is connected to the solenoid pin 23, the balloon sensor 24, the tandem nozzle 60, the main nozzle 50, the sub-nozzle valve 34, and the RH detector 12, and controls these elements constituting the air jet loom 100. In addition, the detection results of the balloon sensor 24 and the RH detector 12 are input to the main control device 11 . Furthermore, the main control device 11 is connected to a function panel 13 . The function panel 13 is a touch panel for displaying the state of the air-jet loom 100 and for operating the air-jet loom 100 by the user.

Fig. 2 is a planar cross-sectional view of the main nozzle 50 viewed from the upper side in the vertical direction of the air-jet loom 100 (see Fig. 1 ). The arrow Y1 direction shown in FIG. 2 is the rear side direction of the bed of the air jet loom 100, and is the direction of the side where the deformed reed 30 is located, and the arrow Y2 direction is the front side direction of the bed of the air jet loom 100. In the following description of FIG. 2 , the upstream side corresponds to the left end side in the air jet loom 100 of FIG. 1 , and the downstream side corresponds to the right end side in the air jet loom 100 of FIG. 1 .

The main nozzle 50 has a cylindrical nozzle body 51, an acceleration tube 52 fitted into the barrel 51a of the nozzle body 51, a yarn guide 53 rotated and accommodated in the barrel 51a of the nozzle body 51, and a thread guide 53 for fixing the yarn guide 53. Lock nut 54 on nozzle body 51.

The downstream end portion of the yarn guide 53 forms a conical flow path forming portion 53a. A plurality of positioning fins 53b arranged at predetermined intervals in the circumferential direction are formed in the flow path forming portion 53a. In addition, a ring-shaped portion 53f exposed from the nozzle body 51 and protruding radially outward of the yarn guide 53 is formed at an upstream end portion of the yarn guide 53 . Further, on the downstream side of the ring portion 53f of the yarn guide 53, a yarn guide screw portion 53h that is screwed with the nozzle main body screw portion 51c formed in the barrel 51a of the nozzle main body 51 is formed. A portion of the yarn guide 53 between the yarn guide thread portion 53h and the ring portion 53f is exposed from the nozzle main body 51 . A lock nut 54 is screwed to the thread guide thread portion 53h. Furthermore, inside the yarn guide 53, a weft passage 53d having a circular cross section is formed. That is, the cross section of the weft passage 53d is circular.

The accelerator tube 52 is formed with a base pipe 52 a fitted to the nozzle main body 51 and a thin tube 52 b fitted radially inside of the base pipe 52 a. A terminal portion 53c that is a downstream end portion of the flow path forming portion 53a of the yarn guide 53 is inserted radially inward of the inner tapered portion 52c of the base tube 52a. An annular air flow path 55 is formed between the cylindrical interior 51 a of the nozzle main body 51 and the end portion 53 c and between the inner tapered portion 52 c and the end portion 53 c. That is, along the outer peripheral surface of the yarn guide 53, an air flow path through which air flows in the direction of the weft passage 53d is formed. The base tube 52a and the thin tube 52b of the accelerator tube 52 constitute a traction passage 52d.

The nozzle main body 51 is formed with a connection port 51 b that communicates with the cylinder interior 51 a and extends in the arrow Y2 direction so as to be perpendicular to the axial direction of the main nozzle 50 . An air supply tube 56 is connected to the connection port 51b. The air supplied from the air supply pipe 56 flows through the air flow path 55, the base pipe 52a, and the narrow pipe 52b. In addition, the weft yarn 21 is introduced and guided into the weft yarn passage 53d of the yarn guide 53 and the pulling passage 52d in the acceleration tube 52 by air. That is, the pulling path 52d constitutes a weft path on the downstream side of the weft path 53d, and extends so as to overlap the air flow path 55 .

Fig. 3 is a perspective view showing the end portion 53c of the flow path forming portion 53a of the yarn guide 53 shown in Fig. 2 . Referring to FIG. 2 and FIG. 3 , a deflection inflow portion 53 e is formed at the tip portion 53 c. The deflection inflow portion 53e is formed by cutting the end portion 53c with a plane S oblique to the central axis L of the weft passage 53d and facing the downstream side of the yarn guide 53 . That is, the deflection inflow part 53e is arranged on the flat surface S which is a single surface. In addition, the normal line M perpendicular to the plane S and extending downstream extends in a direction closer to the arrow Y2 direction that is the front side direction of the bed of the air jet loom 100 (see FIG. 1 ), that is, in a direction away from the deformed reed 30 .

FIG. 4 is a side view of the yarn guide 53 shown in FIG. 2 viewed from the upstream side along the central axis L. As shown in FIG. Referring to FIGS. 2 and 4 , a conical positioning portion 53g formed along the radial direction is provided on the outer peripheral surface of the ring portion 53f at the upstream end of the yarn guide 53 . As shown in FIG. 4 , the positioning portion 53 g is formed in such a direction that the point A on the most upstream side of the deflection inflow portion 53 e is located with respect to the central axis L when the yarn guide 53 is viewed from the upstream side along the central axis L. On a line N aligned with the direction in which the positioning portion 53g is located with respect to the central axis L. Accordingly, the direction of the tip of the positioning portion 53g shows the Y2 direction, which is the direction in which the normal M perpendicular to the plane S formed by the deflection inflow portion 53e of the yarn guide 53 approaches. That is, the positioning portion 53g constitutes a display portion that displays a direction corresponding to the direction of the normal M of the plane S obliquely intersecting the central axis L of the weft passage 53d.

The conical positioning portion 53g can be easily formed by, for example, processing the outer peripheral portion of the ring portion 53f with a drilling tool such as a drill. In addition, since the positioning portion 53g is formed on the outer peripheral surface of the ring portion 53f, the visibility when viewing the air jet loom 100 from the machine front side is good.

Next, the operation of the air-jet loom according to Embodiment 1 will be described. Before the air jet loom 100 shown in FIG. 1 is operated, the main nozzle 50 shown in FIG. 2 is assembled. When assembling the main nozzle 50 , the acceleration tube 52 is fitted into the cylindrical interior 51 a of the nozzle main body 51 . Next, the lock nut 54 is screwed to the thread carrier thread portion 53h of the thread carrier 53 . Next, the yarn guide 53 is inserted into the barrel interior 51a of the nozzle main body 51, and the thread guide thread portion 53h is screwed into and engaged with the nozzle body thread portion 51c of the barrel interior 51a.

At this time, the yarn guide 53 is screwed to the nozzle so that the positioning portion 53g formed on the ring portion 53f of the yarn guide 53 is located in the direction of the arrow Y2, that is, the horizontal front side of the air jet loom 100 (see FIG. 1 ). Subject 51. Thus, the normal M perpendicular to the plane S formed by the deflected inflow portion 53e of the yarn guide 53 is in the horizontal direction and toward the front side of the machine bed of the air-jet loom 100 (the direction away from the deformed reed 30). Direction, that is, in the horizontal direction and in the direction of arrow Y2, the most upstream point A of the deflection inflow portion 53e is located in the direction of arrow Y2, that is, away from the deformed reed 30.

Next, as shown in FIG. 1, the main nozzle 50, the tandem nozzle 60, the solenoid valve and the sub-nozzle valve 34 are controlled by the main control device 11, and the weft yarn 21 is drawn out from the main nozzle 50 by injecting air from the main nozzle 50 and the weft yarn 21 Yarn travels in the weft yarn travel path 31 of the deformed reed 30 . At this time, the time from the reference time when the weft yarn 21 is released from the accumulating drum 22 to the weft yarn 21 detected by the RH detector 12 for pulling out the weft yarn 21 is defined as the weft insertion target position arrival time Tw.

Next, effects obtained by the first embodiment will be described. Fig. 5 is a side view of the weft running path 31 of the deformed reed 30 (see Fig. 1 ) viewed from the upstream side. The weft yarn running path 31 is a passage surrounded by an upper wall surface 31a, a back wall surface 31b, and a lower wall surface 31c. As shown in FIG. 2 , when air is injected from the main nozzle 50 while the normal line M perpendicular to the plane S extends horizontally and in a direction close to the arrow Y2 direction, the weft yarn travels as shown in FIG. 5 . The most upstream side of the path 31 has the highest pressure of the injected air, that is, the pressure center is located at point C1. This point C1 is located at a distance P1 from the back wall surface 31b.

In addition, in the air-jet loom 100 of this Embodiment 1, the following measurement was implemented. The angle R at which the yarn guide 53 of the main nozzle 50 is screwed to the nozzle body 51 relative to the nozzle body 51 , that is, the yarn guide angle R, is set to various angles. In addition, an arbitrary angle can be obtained by the yarn guide angle R by screwing the nozzle body 51 and the yarn guide 53 together. In addition, the orientation of the plane S of the deflection inflow portion 53e obliquely to the central axis L of the weft passage 53d and the extending direction of the normal line M change according to the change of the guide angle R. Then, at each carrier angle R, the air pressure of the main nozzle 50 required for the weft yarn 21 to reach the RH detector 12 at a preset constant value weft insertion target position arrival time Tw was measured.

Fig. 6 is a graph showing the relationship between the yarn carrier angle R and the air pressure in the measurement. In addition, at this time, in terms of the yarn guide angle R, the normal line M perpendicular to the plane S of the deflection inflow portion 53e as shown in FIG. When the front side direction of , that is, extends in the horizontal direction and in a direction close to the arrow Y2 direction, it is set to 180°, 540°, 900°.... In addition, as will be described in detail later, when the normal line M extends in the horizontal direction and toward the rear side of the bed of the air-jet loom 100, that is, in the horizontal direction and in the direction close to the arrow Y1 direction , set to 0°, 360°, 720°.... In addition, when the normal line M extends in the vertical direction and toward the upper side of the bed of the air jet loom 100, it is set to 90°, 450°, 810° . . . . In addition, when the normal line M extends in the vertical direction and toward the lower side of the bed of the air-jet loom 100, it is set to 270°, 630°, 990° . . . .

As in the first embodiment, the normal M perpendicular to the plane S of the deflected inflow portion 53e of the yarn guide 53 of the main nozzle 50 shown in FIG. In the case of , that is, in the case where the yarn guide angle R is 180°, 540°, 900°..., as shown in FIG. Point C1. The point C1 is away from the inner wall surface 31b by a distance P1, and at this time, the yarn running efficiency of the weft yarn 21 on the weft yarn running path 31 is improved. Therefore, as shown in FIG. 6 , the pressure of the air required to make the weft yarn 21 reach the target position at the target position arrival time Tw is compared with the case where the yarn carrier angle R is 180°, 540°, 900°... becomes smaller, the amount of air injected from the main nozzle 50 can be reduced.

In addition, by setting the positioning portion 53g of the yarn guide 53 at a constant position, the air injection pressure required for the weft yarn 21 to reach the target position at the target position arrival time Tw can be adjusted among the stands of the plurality of air jet looms 100. constant.

In this way, the weft delivery nozzle according to Embodiment 1 is a weft delivery nozzle in the air jet loom 100, which blows the weft yarn 21 by injecting air toward the entrance of the weft delivery path 31 of the deformed reed 30 having the weft yarn delivery path 31. Shot to the weft yarn path 31, and the weft delivery nozzle is equipped with: a yarn guide 53, which has a weft yarn passage 53d that introduces and guides the weft yarn 21; An air flow path 55 for allowing air to flow in the direction of the weft path 53d is formed on the outer peripheral surface of the . In addition, the air flow path 55 is extended to overlap with the pulling path 52d on the downstream side of the weft path 53d, the cross section of the weft path 53d in the yarn guide 53 is circular, and a plane oblique to the central axis L of the weft path 53d is used. The S cuts the end portion 53c of the yarn guide 53. Furthermore, since the yarn guide 53 has a positioning portion 53g that shows a direction corresponding to the normal direction of the plane S at the portion exposed from the nozzle body 51, it is possible to make the weft yarn 21 reach the time Tw at the target position. The air injection pressure to the target position is constant among multiple machines.

In addition, when the positioning portion 53g is located in the horizontal direction and in the front direction of the air jet loom 100, the positioning portion 53g is formed so that the direction of the normal line M of the plane S becomes the horizontal direction and is in a direction away from the deformed reed 30. Therefore, By tightening the lock nut 54 in this state, the yarn guide 53 can be mounted at the yarn guide angle R at which the pressure of the air in the main nozzle 50 required for the weft yarn 21 to reach the target position at the target position arrival time Tw becomes the minimum. , the adjustment of the yarn guide angle R becomes easy.

Implementation mode 2.

Next, an air jet loom according to Embodiment 2 of the present invention will be described. In addition, in the following embodiments, the same reference numerals as those in FIGS. 1 to 6 of Embodiment 1 are assigned

are the same or similar structural elements, and thus detailed description thereof will be omitted. This embodiment 2

The angle of the plane S of the deflection inflow portion 53e of the yarn guide 53 of the main nozzle 50 according to the first embodiment is changed.

Fig. 7 is a plan sectional view of the main nozzle 50 according to Embodiment 2 viewed from above in the vertical direction of the air jet loom 100 (see Fig. 1 ). Referring to FIG. 7, for the yarn guide 53 of the main nozzle 50, the normal M perpendicular to the plane S on which the deflected inflow portion 53e of the terminal portion 53c is disposed is in the horizontal direction and moves closer to the machine table of the air jet loom 100. The point A on the most upstream side of the deflection inflow portion 53e is located in the direction close to the arrow Y1, that is, the direction close to the deformed reed 30.

FIG. 8 is a side view of the yarn guide 53 shown in FIG. 7 viewed from the upstream side along the central axis L. As shown in FIG. 7 and 8, when the yarn guide 53 is viewed from the upstream side along the central axis L, the positioning portion 53g provided on the wheel-shaped portion 53f of the yarn guide 53 is formed at the position closest to the deflection inflow portion 53e. The point A on the upstream side is located in a direction rotated by 180° around the center axis L with respect to the direction in which the center axis L is located. That is, in the yarn carrier 53 of the second embodiment, the positional relationship between the positioning portion 53g and the point A is different from the central axis L by 180° from the yarn carrier 53 of the first embodiment. Other structures are the same as those in Embodiment 1.

Next, effects obtained by the second embodiment will be described. As shown in FIGS. 7 and 8 , when the air is injected from the main nozzle 50 while the normal line M perpendicular to the plane S extends in the horizontal direction and in a direction close to the arrow Y1, as shown in FIG. 5 , The most upstream side of the weft traveling path 31 has the highest pressure of the injection air, that is, the pressure center is located at point C2. The point C2 is located at a distance P2 from the back wall surface 31b, which is longer than the distance P1 between the point C1 of the pressure center of the injected air and the back wall surface 31b in the first embodiment.

As in Embodiment 2, the normal line M perpendicular to the plane S of the deflected inflow portion 53e of the yarn guide 53 of the main nozzle 50 shown in FIG. In the case of , that is, in the case where the yarn guide angle R is 0°, 360°, 720°..., as shown in FIG. Point C2. At this time, as shown in FIG. 6 , compared with the case where the yarn carrier angle R is 0°, 360°, 720°, etc., the amount of air required for the weft yarn 21 to reach the target position at the target position arrival time Tw is Since the pressure is increased, there is an advantage that the weft insertion control of the weft yarn 21 by the main nozzle 50 becomes easier.

In this way, when the positioning portion 53g is located in the horizontal direction and approaches the front side of the air jet loom 100, the positioning portion 53g is formed so that the direction of the normal line M of the plane S becomes a horizontal direction and approaches the direction of the deformed reed 30. Therefore, The pressure of the air required to bring the weft yarn 21 to the target position at the target position arrival time Tw increases, and the weft insertion control of the weft yarn 21 by the main nozzle 50 becomes easier.

In Embodiment 2 of the present invention, when the yarn guide 53 is viewed from the upstream side along the central axis L, the direction in which the point A on the most upstream side with respect to the deflection inflow portion 53e is located with respect to the central axis L is On the other hand, the positioning portion 53g is formed in a direction rotated by 180° around the center axis L, but is not limited thereto. For example, like the yarn guide 53 of Embodiment 1, when the yarn guide 53 is viewed from the upstream side along the central axis L, the point A located on the most upstream side of the deflection inflow portion 53e may be formed relative to the center. On the line N in which the direction of the axis L is aligned with the direction in which the positioning portion 53g is located with respect to the central axis L, such a yarn guide 53 is used, and the yarn guide 53 is deflected at the point A on the most upstream side of the inflow portion 53e. The angle in the direction close to the arrow Y1, that is, the direction close to the deformed reed 30 is fixed.

In addition, the yarn carrier 53 described in the first and second embodiments of the present invention may be used at any carrier angle R other than the carrier angle R shown in the first and second embodiments.

In addition, in Embodiment 1 and Embodiment 2 of the present invention, the positioning portion 53g provided on the ring portion 53f of the yarn guide 53 shown in FIGS. A positioning portion of another shape may be provided instead of the positioning portion 53g. FIG. 9 is a plan sectional view showing a positioning portion 53i of a ring portion 53f according to a first modification, and FIG. 10 is a side view of the ring portion 53f shown in FIG. 9 . As shown in FIGS. 9 and 10 , the positioning portion 53i may also be formed in a cylindrical shape extending in the radial direction of the ring portion 53f. The columnar positioning portion 53i can be easily formed by, for example, processing the outer peripheral portion of the ring portion 53f with a drilling tool such as a drill.

FIG. 11 is a plan sectional view showing a positioning portion 53j of a ring portion 53f according to a second modification, and FIG. 12 is a side view of the ring portion 53f shown in FIG. 11 . As shown in FIGS. 11 and 12 , the positioning portion 53 j may extend along the central axis L of the main nozzle 50 and be formed in a V-shaped groove shape. The V-shaped groove-shaped positioning portion 53j can be easily formed by processing the outer peripheral surface of the ring-shaped portion 53f along the central axis L of the main nozzle 50 with a V-groove.

In addition, in the above-mentioned embodiments and modified examples of the present invention, the positioning portions 53g, 53i, and 53j of the yarn guide 53 are formed on the wheel-shaped portion 53f, but they may also be formed on the yarn guide screw portion 53h of the slave yarn guide 53. The exposed portion of the nozzle body 51 between the ring portion 53f.

Furthermore, in Embodiments 1 and 2 of the present invention, the deflected inflow portion 53e of the tip portion 53c of the yarn guide 53 is formed by cutting a plane S that is oblique to the central axis L and faces the downstream side of the yarn guide 53. , but other shapes can also be formed. Fig. 13 is a plan cross-sectional view of a terminal portion 53c according to a third modification. As shown in FIG. 13 , the end portion 53c of the yarn guide 53 may be cut by a circumferential surface D1 whose center is located downstream of the end portion 53c on a single surface to form the deflection inflow portion 53e. In addition, the peripheral surface D1 is a surface oblique to the central axis L (see FIG. 2 ).

Fig. 14 is a plan cross-sectional view of a terminal portion 53c according to a fourth modification. As shown in FIG. 14 , the deflection inflow portion 53 e may be formed by cutting the end portion 53 c with a single surface and a circumferential surface D2 whose center is located upstream from the end portion 53 c. In addition, the peripheral surface D2 is a surface oblique to the central axis L (see FIG. 2 ).

In the case of the third modified example of FIG. 13 and the fourth modified example of FIG. 14 , when the end portion 53c is cut off by the peripheral surface D1 or the peripheral surface D2 to form the deflection inflow portion 53e, the deflection inflow portion 53e is formed in the same manner as in the first or second embodiment. The same effect as that of the first or second embodiment can be obtained by setting the normal M with respect to the peripheral surface D1 or D2 to the horizontal direction and the direction away from or close to the deformed reed 30 of the air jet loom 100 .

Claims (3)

1. A weft yarn delivery nozzle in an air jet loom for ejecting weft yarn to a weft yarn path by injecting air toward an inlet of the weft yarn path of a textured reed having the weft yarn path, the weft yarn delivery nozzle comprising:

a yarn guide having a weft yarn path for introducing and guiding the weft yarn; and

a nozzle body which accommodates the yarn guide and forms an air flow path along the outer circumferential surface of the yarn guide for air to flow along the weft passage,

extending the air flow path to overlap with a weft yarn path on a downstream side of the weft yarn path,

the cross section of the weft yarn passage in the yarn guide is made circular, the end portion of the yarn guide is cut by a surface oblique to the central axis of the weft yarn passage,

the yarn guide includes a display portion at a portion exposed from the nozzle body, the display portion displaying a direction corresponding to a normal direction of the surface.

2. Weft yarn delivery nozzle in an air jet loom according to claim 1, characterized in that,

when the display portion is positioned in a horizontal direction and in a front direction of the air jet loom, the display portion is formed so that a normal direction of the surface is a horizontal direction and a direction away from the deformed reed.

3. Weft yarn delivery nozzle in an air jet loom according to claim 1, characterized in that,

when the display portion is positioned in the horizontal direction and in the front direction of the air jet loom, the display portion is formed so that the normal direction of the surface is in the horizontal direction and in the direction approaching the deformed reed.

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