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

Abstract

The purpose is to provide a weft yarn conveying nozzle in an air jet loom, which can make the air jet pressure for enabling the weft yarn to reach the target position at the moment of reaching the target position constant among a plurality of machine tables. The weft yarn conveying nozzle is provided with: a yarn guide (53) having a weft yarn path (53 d) for introducing and guiding the weft yarn (21); and a nozzle body (51) which accommodates the yarn guide and forms an air flow path (55) along the outer peripheral surface of the yarn guide for enabling air to flow along the direction of the weft yarn path. The air passage is extended to overlap with a traction passage (52 d) on the downstream side of the weft passage, the weft passage cross section in the yarn guide is made circular, and the end portion (53 c) of the yarn guide is cut by a plane (S) oblique to the central axis (L) of the weft passage. The yarn carrier further has a positioning portion (53 g) which displays a direction corresponding to the normal direction of the plane at a portion exposed from the nozzle body.

Description

Weft yarn conveying nozzle in air jet loom

Technical Field

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

Background

As a weft yarn transporting nozzle for ejecting weft yarn by injecting air to a weft yarn path inlet of a reed of an air jet loom, for example, a weft yarn transporting nozzle as described in patent document 1 is known. In this weft yarn feeding nozzle, the cross section of the weft yarn passage in the yarn carrier is made circular, and the tip end portion of the yarn carrier is formed in a shape cut along a plane oblique to the central axis of the weft yarn passage.

Patent document 1: japanese patent laid-open publication No. 2003-20543

However, in the weft yarn feeding nozzle described in patent document 1, it is known from the study of the inventors that the air jet pressure for making the weft yarn inserted from the weft yarn feeding nozzle reach the target position at the target position reaching time varies depending on the mounting position of the yarn carrier. Therefore, there are the following problems: the air jet pressure optimized for a particular machine is also optimized for other machines with different mounting positions of the yarn guide.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a weft yarn transporting nozzle in an air jet loom capable of making an air jet pressure for reaching a target position at a target position reaching timing constant between a plurality of machine stations

The weft yarn transporting nozzle in an air jet loom according to the present invention ejects weft yarn to a weft yarn path by injecting air toward an inlet of the weft yarn path of a reed having a warp yarn path, and includes: a yarn guide having a weft yarn path for introducing and guiding a weft yarn; and a nozzle body which accommodates the yarn carrier and forms an air flow path for air to flow along the direction of the weft yarn path along the outer peripheral surface of the yarn carrier, wherein in the weft yarn conveying nozzle of the air jet loom, the air flow path is prolonged to be overlapped with the weft yarn path on the downstream side of the weft yarn path, the cross section of the weft yarn path in the yarn carrier is made into a circular shape, the tail end part of the yarn carrier is cut by a surface oblique to the central axis of the weft yarn path, and the yarn carrier is provided with a display part at the exposed part of the nozzle body, and the display part displays the direction corresponding to the normal direction of the surface.

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

According to the present invention, a weft yarn transporting nozzle in an air jet loom includes: a yarn guide having a weft yarn path for introducing and guiding a weft yarn; and a nozzle body which accommodates the yarn carrier and forms an air flow path for air to flow along the direction of the weft yarn path along the outer peripheral surface of the yarn carrier, wherein in the weft yarn conveying nozzle of the air jet loom, the air flow path is lengthened to be overlapped with the weft yarn path on the downstream side of the weft yarn path, the cross section of the weft yarn path in the yarn carrier is made to be circular, the terminal part of the yarn carrier is cut by a surface oblique to the central axis of the weft yarn path, and the yarn carrier is provided with a display part which displays the direction corresponding to the normal direction of the surface at the exposed part of the nozzle body, so that the air jet pressure for enabling the weft yarn to reach the target position at the target position can be kept constant among a plurality of machine tables.

Drawings

Fig. 1 is a schematic view 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 a distal end portion of a flow path forming portion of the yarn carrier shown in fig. 2.

Fig. 4 is a side view of the yarn carrier shown in fig. 2 as seen from the upstream side along the central axis.

Fig. 5 is a side view of the weft yarn path of the modified reed shown in fig. 1, as seen from the upstream side.

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

Fig. 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 carrier shown in fig. 7 viewed from the upstream side along the central axis.

Fig. 9 is a plan sectional view showing a positioning portion of a wheel-shaped portion according to modification 1.

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

Fig. 11 is a plan sectional view showing a positioning portion of a wheel-shaped portion according to modification 2.

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

Fig. 13 is a plan sectional view of a distal end portion according to modification 3.

Fig. 14 is a plan sectional view of a distal end portion according to modification 4.

Description of the reference numerals

Weft yarn; deforming reed; weft yarn path; 51. nozzle body; traction pathway (weft path); 53. yarn guides; end portion; weft yarn path; a positioning unit 53g, 53i, 53 j; 55. an air flow path; air jet loom; d1. circumferential surface (oblique surface); d2. the circumferential surface (the surface of the skew line); central axis; m. normal; s. plane (oblique plane).

Detailed Description

Embodiment 1.

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

The weft insertion device 40 is provided with a series nozzle 60 and a main nozzle 50. The tandem nozzle 60 and the main nozzle 50 jet the compressed air (air) supplied from the air tank 41. Further, solenoid valves, not shown, are provided in the serial nozzles 60 and the main nozzles 50, and the opening and closing of the solenoid valves are used to switch between the injection of air and the stop of the injection of air. The tandem nozzle 60 ejects the weft yarn 21 from the accumulating drum 22 by injecting air, and ejects the yarn 21 to the main nozzle 50 provided on the downstream side.

The main nozzle 50 ejects the weft yarn 21 ejected from the tandem nozzle 60 toward the inlet of the weft yarn path 31 of the reed 30. Along the weft yarn path 31 of the reed 30, a plurality of solenoid valves, that is, sub-nozzle valves 34 connected to sub-tanks 35, and sub-nozzles 32 connected to the sub-nozzle valves 34 are provided, respectively. The sub-nozzles 32 jet air by opening and closing the sub-nozzle valves 34, thereby transporting the weft yarn 21 along the weft yarn path 31 from the side where the main nozzles 50 are provided, i.e., the upstream side of the left end of the air jet loom 100 in fig. 1, to the downstream side of the right end. In addition, the main nozzles constitute weft yarn conveying nozzles.

An RH detector 12 for detecting the running state of the weft yarn is provided on the right end side of the reed 30. The RH detector 12 is connected to the main control device 11 of the air jet loom 100. The main control device 11 is connected to the electromagnetic 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. The detection results of the balloon sensor 24 and the RH detector 12 are input to the main control device 11. The main control device 11 is connected to the function panel 13. The function panel 13 is a touch panel for displaying the state of the air jet loom 100 and for a user to operate the air jet loom 100.

Fig. 2 is a plan sectional view of the main nozzle 50 when viewed from the vertical upper side of the machine table of the air jet loom 100 (see fig. 1). The arrow Y1 direction shown in fig. 2 is a rear side direction of the machine frame of the air jet loom 100, and is a direction on which the deformed reed 30 is located, and the arrow Y2 direction is a front side direction of the machine frame 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 includes a cylindrical nozzle body 51, an acceleration tube 52 fitted into a cylinder 51a of the nozzle body 51, a yarn guide 53 screwed into the cylinder 51a of the nozzle body 51, and a lock nut 54 for fixing the yarn guide 53 to the nozzle body 51.

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

The acceleration tube 52 is formed with a base tube 52a fitted to the nozzle body 51 and a narrow tube 52b fitted to the inner side of the base tube 52a in the radial direction. The distal end 53c, which is the downstream end of the flow passage forming portion 53a of the yarn guide 53, is inserted into the radial inside of the inside tapered portion 52c of the base tube 52 a. An annular air flow passage 55 is formed between the tube interior 51a and the distal end portion 53c of the nozzle body 51 and between the inner tapered portion 52c and the distal end portion 53c. That is, an air flow path for allowing air to flow in the direction of the weft passage 53d is formed along the outer peripheral surface of the yarn guide 53. The base tube 52a and the thin tube 52b of the acceleration tube 52 constitute a traction passage 52d.

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

Fig. 3 is a perspective view showing a distal end portion 53c of the flow path forming portion 53a of the yarn carrier 53 shown in fig. 2. Referring to fig. 2 and 3, a deflection inflow portion 53e is formed in the distal end portion 53c. The deflecting inflow portion 53e is formed by cutting the distal end portion 53c with a plane S that is oblique to the central axis L of the weft passage 53d and faces the downstream side of the yarn guide 53. That is, the deflection inflow portion 53e is arranged on the plane S that is a single surface. The normal line M extending downstream perpendicularly to the plane S extends in a direction approaching the arrow Y2 direction, that is, in a direction away from the reed 30, which is the front direction of the machine frame of the air jet loom 100 (see fig. 1).

Fig. 4 is a side view of the yarn carrier 53 shown in fig. 2 viewed from the upstream side along the central axis L. Referring to fig. 2 and 4, a conical positioning portion 53g formed along the radial direction is provided on the outer peripheral surface of the wheel portion 53f at the upstream end portion of the yarn guide 53. As shown in fig. 4, the positioning portion 53g is formed on a line N that aligns a direction in which a point a on the most upstream side of the deflecting inflow portion 53e is located with respect to the central axis L and a direction in which the positioning portion 53g is located with respect to the central axis L when the yarn carrier 53 is viewed from the upstream side along the central axis L. Thus, the direction of the tip of the positioning portion 53g shows the Y2 direction, and the Y2 direction is a direction in which the normal M orthogonal to the plane S formed by the deflection inflow portion 53e of the yarn carrier 53 approaches. That is, the positioning portion 53g constitutes a display portion that displays a direction corresponding to the normal M direction of the plane S oblique to the central axis L of the weft passage 53d.

The positioning portion 53g having a conical shape can be easily formed by, for example, machining the outer peripheral portion of the annular portion 53f with a boring tool such as a drill bit. Further, since the positioning portion 53g is formed on the outer peripheral surface of the wheel-shaped portion 53f, visibility is good when the air jet loom 100 is viewed from the front side of the machine.

Next, an 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. In assembling the main nozzle 50, the acceleration tube 52 is fitted into the cylinder 51a of the nozzle body 51. Next, the lock nut 54 is screwed to the thread guide screw portion 53h of the thread guide 53. Next, the yarn guide 53 is inserted into the tube 51a of the nozzle body 51, and the yarn guide screw portion 53h is screwed into and screwed to the nozzle body screw portion 51c of the tube 51a.

At this time, the yarn carrier 53 is screwed to the nozzle body 51 so that the positioning portion 53g formed in the wheel-shaped portion 53f of the yarn carrier 53 is positioned in the arrow Y2 direction, that is, in the horizontal front direction of the air jet loom 100 (see fig. 1). Thus, the normal M orthogonal to the plane S formed by the deflection inflow portion 53e of the yarn guide 53 is in the horizontal direction and in the direction toward the front side of the machine table of the air jet loom 100 (the direction away from the reed 30), that is, in the horizontal direction and in the direction toward the arrow Y2, and the point a on the most upstream side of the deflection inflow portion 53e is located in the direction toward the arrow Y2, that is, in the direction away from the 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 is caused to travel in the weft yarn travel path 31 of the reed 30. At this time, the time from the reference time when the weft yarn 21 is released from the accumulating drum 22 to draw out the weft yarn 21 until the weft yarn 21 is detected by the RH detector 12 is set as the weft insertion target position reaching time Tw.

Next, effects obtained by embodiment 1 will be described. Fig. 5 is a side view of the weft yarn path 31 of the deformed reed 30 (see fig. 1) viewed from the upstream side. The weft yarn path 31 is a passage surrounded by an upper wall surface 31a, a back wall surface 31b, and a lower wall surface 31 c. When air is ejected from the main nozzle 50 with the normal M orthogonal to the plane S extending in the horizontal direction and in the direction approaching the arrow Y2 direction as shown in fig. 2, the pressure center, which is the highest pressure of the ejected air at the most upstream side of the weft yarn path 31, is located at the point C1 as shown in fig. 5. The point C1 is located at a distance P1 from the back side wall surface 31 b.

In the air jet loom 100 according to embodiment 1, the following measurement is performed. The angle of the yarn guide 53 with respect to the nozzle main body 51, that is, the yarn guide angle R at which the yarn guide 53 of the main nozzle 50 is screwed into the nozzle main body 51 is set to various angles. The yarn guide angle R can be arbitrarily set by screwing the nozzle body 51 and the yarn guide 53. In addition, according to the change in the carrier angle R, the direction of the plane S of the deflecting inflow portion 53e inclined to the central axis L of the weft passage 53d and the extending direction of the normal M are changed. Then, the air pressure of the main nozzle 50 required for the weft yarn 21 to reach the RH detector 12 at the time Tw at which the weft insertion target position of a predetermined constant value is reached is measured at each carrier angle R.

Fig. 6 is a graph showing a relationship between the yarn carrier angle R and the air pressure in the measurement. In this case, the yarn guide angle R is set to 180 °, 540 °, 900 ° … … when the normal M orthogonal to the plane S of the deflection inflow portion 53e extends in the horizontal direction and in the direction toward the front side of the machine base of the air jet loom 100, that is, in the horizontal direction and in the direction toward the arrow Y2, as shown in fig. 2. As will be described later in detail, the normal M is set to 0 °, 360 °, 720 °, … … when it extends in the horizontal direction and in the direction toward the rear side of the machine base of the air jet loom 100, that is, in the horizontal direction and in the direction toward the arrow Y1. When the normal M extends in the vertical direction to the upper side of the machine frame of the air jet loom 100, the normal M is set to 90 °, 450 °, 810 °, … … °. When the normal M extends in the vertical direction and toward the lower side of the machine table of the air jet loom 100, 270 °, 630 °, 990 ° … … are set.

As in embodiment 1, when the normal M orthogonal to the plane S of the deflecting and inflow portion 53e of the yarn guide 53 of the main nozzle 50 shown in fig. 2 extends in the horizontal direction and in the direction approaching the arrow Y2 direction, that is, when the yarn guide angle R is 180 °, 540 °, 900 ° … …, the center of pressure of the injected air at the most upstream side of the weft yarn running path 31 is located at the point C1 as shown in fig. 5. The point C1 is separated from the inner sidewall surface 31b by a distance P1, and at this time, the yarn feeding efficiency of the weft yarn 21 on the weft yarn feeding path 31 is improved. Therefore, as shown in fig. 6, the amount of air ejected from the main nozzle 50 can be reduced in order to reduce the pressure of air required for the weft yarn 21 to reach the target position at the target position reaching time Tw, compared to the case where the carrier angle R is other than 180 °, 540 °, 900 °, … ….

Further, by setting the positioning portion 53g of the yarn guide 53 to a constant position, the air jet pressure required to reach the target position at the target position reaching time Tw can be set to be constant between the platforms of the plurality of air jet looms 100.

As described above, the weft yarn transporting nozzle according to embodiment 1 is a weft yarn transporting nozzle in an air jet loom 100 that ejects weft yarn 21 to a weft yarn path 31 by injecting air toward an inlet of the weft yarn path 31 of a texturing reed 30 having the weft yarn path 31, and includes: a yarn guide 53 having a weft yarn path 53d for introducing and guiding the weft yarn 21; and a nozzle body 51 that accommodates the yarn guide 53 and forms an air flow path 55 along the outer peripheral surface of the yarn guide 53 for air to flow in the direction of the weft passage 53d. The air flow path 55 is extended to overlap with the traction 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 made circular, and the end portion 53c of the yarn guide 53 is cut by a plane S oblique to the central axis L of the weft path 53d. The yarn guide 53 includes a positioning portion 53g, and the positioning portion 53g displays a direction corresponding to the normal direction of the plane S at a portion exposed from the nozzle body 51, so that the air jet pressure for causing the weft yarn 21 to reach the target position at the target position reaching time Tw can be made constant between the plurality of machines.

Further, since the positioning portion 53g is formed so that the normal M direction of the plane S is the horizontal direction and the direction away from the deformed reed 30 when the positioning portion 53g is positioned in the horizontal direction and the front side direction of the air jet loom 100, the lock nut 54 is tightened in this state, and therefore, the yarn guide 53 can be attached at the yarn guide angle R which minimizes the pressure of the air of the main nozzle 50 required for the weft yarn 21 to reach the target position at the target position arrival time Tw, and adjustment of the yarn guide angle R becomes easy.

Embodiment 2.

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

The components are identical or similar, and therefore, detailed description thereof will be omitted. Embodiment 2

The air jet loom according to embodiment 1 changes the angle of the plane S of the deflecting and inflow portion 53e of the yarn carrier 53 provided with the main nozzle 50.

Fig. 7 is a plan sectional view of the main nozzle 50 of embodiment 2 as viewed from above in the vertical direction of the air jet loom 100 (see fig. 1). Referring to fig. 7, in the yarn carrier 53 of the main nozzle 50, a normal M orthogonal to the plane S on which the deflection inflow portion 53e of the distal end portion 53c is arranged extends in the horizontal direction toward the rear side of the machine frame of the air jet loom 100, that is, in the horizontal direction and toward the direction of the arrow Y1, and a point a on the most upstream side of the deflection inflow portion 53e is located in the direction toward the arrow Y1, that is, toward the reed 30.

Fig. 8 is a side view of the yarn carrier 53 shown in fig. 7 as viewed from the upstream side along the central axis L. Referring to fig. 7 and 8, when the yarn carrier 53 is viewed from the upstream side along the central axis L, the positioning portion 53g provided in the wheel-like portion 53f of the yarn carrier 53 is formed in a direction rotated 180 ° about the central axis L with respect to the direction in which the point a on the most upstream side of the deflecting inflow portion 53e is located with respect to the central axis L. That is, the yarn carrier 53 according to embodiment 2 differs from the yarn carrier 53 according to embodiment 1 in the positional relationship between the positioning portion 53g and the point a by 180 ° with respect to the central axis L. The other configuration is the same as that of embodiment 1.

Next, effects obtained by embodiment 2 will be described. When air is ejected from the main nozzle 50 with the normal M orthogonal to the plane S extending in the horizontal direction and in the direction approaching the arrow Y1 as shown in fig. 7 and 8, the pressure center, which is the highest pressure of the ejected air at the most upstream side of the weft yarn running path 31, is located at the point C2 as shown in fig. 5. The point C2 is located at a distance P2 from the back side wall surface 31b, and the distance P2 is longer than the distance P1 between the point C1 of the center of pressure of the injected air and the back side wall surface 31b in embodiment 1.

As in embodiment 2, when the normal M orthogonal to the plane S of the deflecting and inflow portion 53e of the yarn guide 53 of the main nozzle 50 shown in fig. 7 extends in the horizontal direction and in the direction approaching the arrow Y1 direction, that is, when the yarn guide angle R is 0 °, 360 °, 720 ° … …, the center of pressure of the injected air at the most upstream side of the weft yarn running path 31 is located at the point C2 as shown in fig. 5. At this time, as shown in fig. 6, there is an advantage that the weft insertion control of the weft yarn 21 by the main nozzle 50 becomes easier because the pressure of the air required for the weft yarn 21 to reach the target position at the target position reaching time Tw becomes higher than when the carrier angle R is other than 0 °, 360 °, 720 °, … ….

In this way, when the positioning portion 53g is positioned in the horizontal direction and in the direction closer to the front side of the air jet loom 100, the positioning portion 53g is formed so that the normal M direction of the plane S is the horizontal direction and in the direction closer to the deformed reed 30, and therefore, the pressure of the air required for the weft yarn 21 to reach the target position at the target position arrival time Tw is increased, and the weft insertion control of the weft yarn 21 by the main nozzle 50 is facilitated.

In embodiment 2 of the present invention, the positioning portion 53g is formed in a direction rotated 180 ° about the central axis L with respect to the direction in which the central axis L is located at the point a on the most upstream side of the deflecting inflow portion 53e when the yarn carrier 53 is viewed from the upstream side along the central axis L, but the present invention is not limited thereto. For example, as in the yarn guide 53 of embodiment 1, when the yarn guide 53 is viewed from the upstream side along the central axis L, the yarn guide 53 may be used on a line N in which the point a on the most upstream side of the deflection inflow portion 53e is aligned with the direction in which the positioning portion 53g is aligned with the direction in which the central axis L is located with respect to the direction in which the central axis L is located, and the yarn guide 53 may be fixed at an angle such that 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, in the direction close to the reed 30.

The yarn carrier 53 described in embodiment 1 and embodiment 2 of the present invention may be used at any yarn carrier angle R other than the yarn carrier angle R described in embodiment 1 and embodiment 2.

In embodiment 1 and embodiment 2 of the present invention, the positioning portion 53g provided in the wheel portion 53f of the yarn carrier 53 shown in fig. 2 and 4 is formed in a conical shape, but the present invention is not limited to this, and other shaped positioning portions may be provided instead of the positioning portion 53g. Fig. 9 is a plan sectional view showing a positioning portion 53i of a wheel portion 53f according to modification 1, and fig. 10 is a side view of the wheel portion 53f shown in fig. 9. As shown in fig. 9 and 10, the positioning portion 53i may be formed in a cylindrical shape extending in the radial direction of the wheel-shaped portion 53f. The positioning portion 53i having a cylindrical shape can be easily formed by, for example, performing a machining process by a boring tool such as a drill on the outer peripheral portion of the wheel portion 53f.

Fig. 11 is a plan sectional view showing a positioning portion 53j of a wheel portion 53f according to modification 2, and fig. 12 is a side view of the wheel portion 53f shown in fig. 11. As shown in fig. 11 and 12, the positioning portion 53j may be formed in a V-groove shape extending along the central axis L of the main nozzle 50. The V-groove-shaped positioning portion 53j can be easily formed by V-groove machining the outer peripheral surface of the wheel-shaped portion 53f along the central axis L of the main nozzle 50.

In the embodiment and the modification of the present invention described above, the positioning portions 53g, 53i, 53j of the yarn carrier 53 are formed in the wheel portion 53f, but may be formed in a portion exposed from the nozzle body 51 between the yarn carrier screw portion 53h and the wheel portion 53f of the yarn carrier 53.

In embodiment 1 and embodiment 2 of the present invention, the deflection inflow portion 53e of the distal end portion 53c of the yarn carrier 53 is formed by cutting the plane S that is inclined to the central axis L and faces the downstream side of the yarn carrier 53, but may be formed in other shapes. Fig. 13 is a plan sectional view of a distal end portion 53c according to modification 3. As shown in fig. 13, the end portion 53c of the yarn carrier 53 may be cut from a single circumferential surface D1 having a center located downstream of the end portion 53c, to form a deflection inflow portion 53e. The circumferential surface D1 is a surface inclined with the central axis L (see fig. 2).

Fig. 14 is a plan sectional view of the distal end portion 53c according to modification 4. As shown in fig. 14, the distal end portion 53c may be cut by a circumferential surface D2 having a single surface and having a center located on the upstream side of the distal end portion 53c, to form a deflection inflow portion 53e. The circumferential surface D2 is a surface inclined with the central axis L (see fig. 2).

As in modification 3 of fig. 13 and modification 4 of fig. 14, when the distal end portion 53c is cut from the circumferential surface D1 or the circumferential surface D2 to form the deflection inflow portion 53e, the same effect as in embodiment 1 or embodiment 2 can be obtained by setting the normal M to the circumferential surface D1 or the circumferential surface D2 in the horizontal direction and in a direction away from or close to the deformed reed 30 of the air jet loom 100 as in embodiment 1 or embodiment 2.

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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