Weft yarn supply nozzle in air-jet loom

Abstract

An object is to provide a weft yarn conveying nozzle in a jet loom that can make the air jet pressure for causing the weft yarn to reach a target position at the target arrival time constant among a plurality of machines. The weft yarn conveying nozzle includes: a yarn guide (53) having a weft yarn passage (53d) for introducing and guiding a weft yarn (21); and a nozzle body (51) that houses the yarn guide and forms an air flow path (55) for allowing air to flow in the direction of the weft yarn passage along the outer peripheral surface of the yarn guide. Further, the air flow path is extended to overlap with a traction passage (52d) on the downstream side of the weft yarn passage, the cross section of the weft yarn passage in the yarn guide is made circular, and the end portion (53c) of the yarn guide is cut by a plane (S) that obliquely intersects the central axis (L) of the weft yarn passage. Moreover, the yarn guide has a positioning portion (53g), and the positioning portion shows a direction corresponding to the normal direction of the plane at a portion exposed from the nozzle body.

Description

Technical Field

[0001] The present invention relates to a weft yarn conveying nozzle in a jet loom. Background Art

[0002] As a weft yarn conveying nozzle that ejects a weft yarn by jetting air into the inlet of the weft yarn passage of a warp comb in a jet loom, for example, a weft yarn conveying nozzle as described in Patent Document 1 is known. In this weft yarn conveying nozzle, the cross-sectional area of the weft yarn passage in the yarn guide is made circular, and the end portion of the yarn guide is formed in a shape cut by a plane obliquely intersecting the central axis of the weft yarn passage.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-20543

[0004] However, in the weft yarn conveying nozzle described in Patent Document 1, through the research of the inventors, it is known that the air jet pressure for causing the weft yarn drawn by the weft yarn conveying nozzle to reach the target position at the target arrival time varies depending on the installation position of the yarn guide. Therefore, there is a problem that the air jet pressure optimized for a certain specific machine may not be the best in other machines with different installation positions of the yarn guide. Summary of the Invention

[0005] The present invention has been completed to solve the above problems, and an object thereof is to provide a weft yarn conveying nozzle in a jet loom that can make the air jet pressure for causing the weft yarn to reach the target position at the target arrival time constant among multiple machines.

[0006] The weft yarn conveying nozzle in a jet loom according to the present invention is a weft yarn conveying nozzle in a jet loom that ejects a weft yarn into the inlet of the weft yarn passage of a warp comb having a weft yarn passage by jetting air, and includes: a yarn guide having a weft yarn passage for introducing and guiding a weft yarn; and a nozzle body that houses the yarn guide and forms an air flow path for allowing air to flow in the direction of the weft yarn passage along the outer peripheral surface of the yarn guide. In this weft yarn conveying nozzle in a jet loom, the air flow path is extended to overlap with the weft yarn path on the downstream side of the weft yarn passage, the cross-sectional area of the weft yarn passage in the yarn guide is made circular, the end portion of the yarn guide is cut by a plane obliquely intersecting the central axis of the weft yarn passage, and the yarn guide has a display portion at a position exposed from the nozzle body, and the display portion displays a direction corresponding to the normal direction of the plane.

[0007] In addition, the display portion may be formed such that when the display portion is in the horizontal direction and in the front side direction of the jet loom, the normal direction of the plane is in the horizontal direction and away from the warp comb. In addition, the display portion may be formed such that when the display portion is in the horizontal direction and in the front side direction of the jet loom, the normal direction of the plane is in the horizontal direction and close to the warp comb.

[0008] According to the present invention, a weft yarn supply nozzle in a jet loom includes: a yarn guide having a weft yarn passage for introducing and guiding a weft yarn; and a nozzle body that houses the yarn guide and forms an air flow path along the outer peripheral surface of the yarn guide for air to flow in the direction of the weft yarn passage. In the weft yarn supply nozzle in the jet loom, the air flow path is extended to overlap with the weft yarn path on the downstream side of the weft yarn passage, the cross-section of the weft yarn passage in the yarn guide is circular, the end portion of the yarn guide is cut by a plane that obliquely intersects the central axis of the weft yarn passage, and the yarn guide has a display portion that displays the direction corresponding to the normal direction of the plane at the portion exposed from the nozzle body. Therefore, it is possible to make the air injection pressure for causing the weft yarn to reach the target position at the target arrival time constant among multiple machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic view of a jet loom according to Embodiment 1 of the present invention.

[0010] Figure 2 is a plan sectional view of the main nozzle according to Embodiment 1 of the present invention.

[0011] Figure 3 represents Figure 2 a perspective view of the end portion of the flow path forming portion of the yarn guide shown.

[0012] Figure 4 is a side view of the yarn guide shown, viewed from the upstream side along the central axis. Figure 2 a side view of the weft yarn path of the reed shown, viewed from the upstream side.

[0013] Figure 5 is a side view of Figure 1 the weft yarn path of the reed shown, viewed from the upstream side.

[0014] Figure 6 is a coordinate diagram showing the relationship between the yarn guide angle R and the air pressure.

[0015] Figure 7 is a plan sectional view of the main nozzle according to Embodiment 2 of the present invention.

[0016] Figure 8 is a side view of the yarn guide shown, viewed from the upstream side along the central axis. Figure 7 a side view of the yarn guide shown, viewed from the upstream side along the central axis.

[0017] Figure 9 is a plan sectional view showing the positioning portion of the wheel-shaped portion according to the first modification.

[0018] Figure 10 is Figure 9 a side view of the wheel-shaped portion shown.

[0019] Figure 11 is a plan sectional view of the positioning portion of the annular portion according to the second modification example.

[0020] Figure 12 is Figure 11 a side view of the annular portion shown.

[0021] Figure 13 is a plan sectional view of the end portion according to the third modification example.

[0022] Figure 14 is a plan sectional view of the end portion according to the fourth modification example.

[0023] Explanation of reference numerals

[0024] 21... weft yarn; 30... dobby reed; 31... weft yarn path; 51... nozzle body; 52d... traction path (weft yarn path); 53... yarn guide; 53c... end portion; 53d... weft yarn path; 53g, 53i, 53j... positioning portion; 55... air flow path; 100... air-jet loom; D1... circumferential surface (oblique surface); D2... circumferential surface (oblique surface); L... central axis; M... normal line; S... plane (oblique surface). Detailed description of the preferred embodiments

[0025] Embodiment 1.

[0026] Hereinafter, the air-jet loom according to Embodiment 1 of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 is a schematic view of the air-jet loom according to Embodiment 1. In the air-jet loom 100, a weft feeding device 20, a storage drum 22 for storing the weft yarn 21 drawn out from the weft feeding device 20, and a weft insertion device 40 for inserting the weft yarn 21 to the dobby reed 30 on the downstream side of the storage drum 22 are provided. On the downstream side of the storage drum 22, an electromagnetic pin 23 for releasing or locking the weft yarn 21 from the storage drum 22, and a balloon sensor 24 for detecting the release of the weft yarn 21 from the storage drum 22 are provided.

[0027] In the weft insertion device 40, a serial nozzle 60 and a main nozzle 50 are provided. The serial nozzle 60 and the main nozzle 50 eject compressed air (air) supplied from an air tank 41. In addition, solenoid valves (not shown) are provided in the serial nozzle 60 and the main nozzle 50, and the ejection and stop of the air are switched by opening and closing the solenoid valves. The serial nozzle 60 draws out the weft yarn 21 from the storage drum 22 by ejecting air, and shoots the yarn 21 to the main nozzle 50 provided on the downstream side.

[0028] The main nozzle 50 jets 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, namely sub-nozzle valves 34, connected to the sub-tank 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 conveying the weft yarn 21 along the weft yarn path 31 from the upstream side of the left end of the air-jet loom 100 in Figure 1 to the downstream side of the right end. In addition, the main nozzle constitutes a weft yarn conveying nozzle.

[0029] 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. In addition, the detection results of the balloon sensor 24 and the RH detector 12 are input to the main control device 11. And the main control device 11 is connected to the function panel 13. The function panel 13 is a touch panel that displays the state of the air-jet loom 100 and is used for the user to operate the air-jet loom 100.

[0030] Figure 2 is a plan sectional view when observing the main nozzle 50 from the upper side in the vertical direction of the machine frame of the air-jet loom 100 (refer to Figure 1 ). Figure 2 The direction of the arrow Y1 shown is the rear side direction of the machine frame of the air-jet loom 100 and is the direction of the side where the reed 30 is located, and the direction of the arrow Y2 is the front side direction of the machine frame of the air-jet loom 100. In addition, in Figure 2 the following description, the upstream side corresponds to the left end side in the air-jet loom 100 of Figure 1 , and the downstream side corresponds to the right end side in the air-jet loom 100 of Figure 1 .

[0031] The main nozzle 50 has a cylindrical nozzle body 51, an acceleration tube 52 embedded in the inner cylinder 51a of the nozzle body 51, a yarn guide 53 screwed and accommodated in the inner cylinder 51a of the nozzle body 51, and a lock nut 54 for fixing the yarn guide 53 to the nozzle body 51.

[0032] The downstream end of the yarn guide 53 forms a flow path forming portion 53a having a conical surface shape. In the flow path forming portion 53a, a plurality of positioning fin members 53b are formed at predetermined intervals in the circumferential direction. In addition, a wheel-shaped portion 53f that protrudes radially outward of the yarn guide 53 and is exposed from the nozzle body 51 is formed at the upstream end of the yarn guide 53. And, a yarn guide thread portion 53h that is screwed with a nozzle body thread portion 51c formed in the cylinder 51a of the nozzle body 51 is formed on the downstream side of the wheel-shaped portion 53f of the yarn guide 53. The portion between the yarn guide thread portion 53h and the wheel-shaped portion 53f of the yarn guide 53 is exposed from the nozzle body 51. A lock nut 54 is screwed onto the yarn guide thread portion 53h. In addition, a weft yarn passage 53d having a circular cross section is formed inside the yarn guide 53. That is, the cross section of the weft yarn passage 53d is circular.

[0033] In the acceleration tube 52, a base tube 52a that fits with the nozzle body 51 and a thin tube 52b that fits inside the base tube 52a in the radial direction are formed. The downstream end portion, that is, the end portion 53c of the flow path forming portion 53a of the yarn guide 53 is inserted radially inside the inner tapered portion 52c of the base tube 52a. An annular air flow path 55 is formed between the cylinder 51a of the nozzle body 51 and the end portion 53c and between the inner tapered portion 52c and the end portion 53c. That is, an air flow path that allows air to flow in the direction of the weft yarn 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.

[0034] A connection port 51b is formed in the nozzle body 51. The connection port 51b communicates with the cylinder 51a and extends in the direction of arrow Y2 in a direction orthogonal 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 tube 56 flows in the air flow path 55, the base tube 52a, and the thin tube 52b. In addition, the weft yarn 21 is introduced and guided into the weft yarn passage 53d of the yarn guide 53 and the traction passage 52d inside the acceleration tube 52 by air. That is, the traction passage 52d constitutes the weft yarn path on the downstream side of the weft yarn passage 53d and extends to overlap with the air flow path 55.

[0035] Figure 3 It represents Figure 2 A perspective view of the end portion 53c of the flow path forming portion 53a of the yarn guide 53 shown. If referring to Figure 2 and Figure 3 , a deflection inflow portion 53e is formed in the end portion 53c. The deflection inflow portion 53e is formed by cutting the end portion 53c with a plane S that is obliquely intersecting the central axis L of the weft yarn passage 53d and facing 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. In addition, a normal line M that is orthogonal to the plane S and extends downstream faces the air jet loom 100 (refer toFigure 1 ) extends in the direction of the front side of the machine towards the arrow Y2 direction, that is, away from the reed 30.

[0036] Figure 4 When viewed from the upstream side along the central axis L Figure 2 is a side view of the yarn guide 53 shown. Refer to Figure 2 and Figure 4 , a conical positioning portion 53g formed along the radial direction is provided on the outer peripheral surface of the wheel-shaped portion 53f at the upstream end of the yarn guide 53. As Figure 4 shown, the positioning portion 53g is formed such that when the yarn guide 53 is viewed from the upstream side along the central axis L, it is on the line N where the direction of the point A at the most upstream side of the deflection inflow portion 53e with respect to the central axis L is aligned with the direction of the positioning portion 53g with respect to the central axis L. Thus, the direction of the end of the positioning portion 53g indicates the Y2 direction, and the Y2 direction is the direction close to the normal line M orthogonal to the plane S formed by the deflection inflow portion 53e of the yarn guide 53. That is, the positioning portion 53g constitutes a display portion that displays the direction corresponding to the direction of the normal line M of the plane S obliquely intersecting the central axis L of the weft passage 53d.

[0037] The conical positioning portion 53g can be easily formed, for example, by processing the outer peripheral portion of the wheel-shaped portion 53f with a hole-opening tool such as a drill. In addition, since the positioning portion 53g is formed on the outer peripheral surface of the wheel-shaped portion 53f, the visibility is good when viewing the air-jet loom 100 from the front side of the machine.

[0038] Next, the operation of the air-jet loom of the first embodiment will be described. Before Figure 1 the air-jet loom 100 shown operates, the main nozzle 50 shown in Figure 2 is assembled. When assembling the main nozzle 50, the acceleration tube 52 is inserted into the cylinder 51a of the nozzle body 51. Next, the lock nut 54 is screwed onto the yarn guide thread portion 53h of the yarn guide 53. Next, the yarn guide 53 is inserted into the cylinder 51a of the nozzle body 51, and the yarn guide thread portion 53h is screwed and engaged with the nozzle body thread portion 51c in the cylinder 51a.

[0039] At this time, the positioning portion 53g formed on the wheel-shaped portion 53f of the yarn guide 53 is positioned in the arrow Y2 direction, that is, the air-jet loom 100 (refer to Figure 1) Rotate the yarn guide 53 onto the nozzle body 51 in a manner of the horizontal front side direction. Thus, the normal line 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 of the front side of the loom 100 (the direction away from the reed 30), that is, in the horizontal direction and in the direction close to the arrow Y2 direction. The point A on the uppermost upstream side of the deflection inflow portion 53e is in the direction close to the arrow Y2, that is, in the direction away from the reed 30.

[0040] Next, as Figure 1 shown, control the main nozzle 50, the tandem nozzle 60, the solenoid valve, and the sub-nozzle valve 34 by the main control device 11. Draw out the weft yarn 21 from the main nozzle 50 by jetting air from the main nozzle 50 and make the weft yarn 21 travel within the weft yarn path 31 of the reed 30. At this time, set the time from the reference time when the weft yarn 21 is released from the storage drum 22 to draw out the weft yarn 21 until the weft yarn 21 is detected by the RH detector 12 as the weft insertion target position arrival time Tw.

[0041] Next, the effects obtained by the first embodiment will be described. Figure 5 is a side view of the weft yarn path 31 of the reed 30 (refer to Figure 1 ) as viewed from the upstream side. The weft yarn path 31 is a passage surrounded by the upper wall surface 31a, the inner side wall surface 31b, and the lower wall surface 31c. As Figure 2 shown, when air is jetted from the main nozzle 50 in the case where the normal line M orthogonal to the plane S extends in the horizontal direction and in the direction close to the arrow Y2 direction, as Figure 5 shown, the portion with the highest pressure of the jetted air at the uppermost upstream side of the weft yarn path 31, that is, the pressure center, is at the point C1. This point C1 is at a position at a distance P1 from the inner side wall surface 31b.

[0042] In addition, in the air-jet loom 100 of the first embodiment, the following measurement was carried out. Set the angle of the yarn guide 53 relative to the nozzle body 51 when the yarn guide 53 of the main nozzle 50 is rotated onto the nozzle body 51, that is, the yarn guide angle R, to a variety of angles. In addition, the yarn guide angle R can obtain any angle by the rotation between the nozzle body 51 and the yarn guide 53. Further, according to the change of the yarn guide angle R, the orientation of the plane S of the deflection inflow portion 53e obliquely intersecting the central axis L of the weft yarn passage 53d and the extending direction of the normal line M change. Moreover, at each yarn guide angle R, the air pressure of the main nozzle 50 required for the weft yarn 21 to reach the RH detector 12 at the preset constant weft insertion target position arrival time Tw was measured.

[0043] Figure 6It is a coordinate diagram showing the relationship between the yarn guide angle R and the air pressure in this measurement. In addition, at this time, regarding the yarn guide angle R, when the normal line M orthogonal to the plane S of the deflection inflow portion 53e of the yarn guide 53 of the main nozzle 50 extends in the horizontal direction and toward the front side of the loom body of the air jet loom 100, that is, in the horizontal direction and toward the direction close to the arrow Y2, it is set as 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 loom body of the air jet loom 100, that is, in the horizontal direction and toward the direction close to the arrow Y1, it is set as 0°, 360°, 720°,.... And when the normal line M extends vertically upward toward the loom body of the air jet loom 100, it is set as 90°, 450°, 810°,.... In addition, when the normal line M extends vertically downward toward the loom body of the air jet loom 100, it is set as 270°, 630°, 990°,.... Figure 2 shown, when the normal line M orthogonal to the plane S of the deflection inflow portion 53e of the yarn guide 53 extends in the horizontal direction and toward the front side of the loom body of the air jet loom 100, that is, in the horizontal direction and toward the direction close to the arrow Y2, it is set as 180°, 540°, 900°,....

[0044] As in the first embodiment, when Figure 2 shown, when the normal line M orthogonal to the plane S of the deflection inflow portion 53e of the yarn guide 53 of the main nozzle 50 extends in the horizontal direction and toward the direction close to the arrow Y2, that is, when the yarn guide angle R is 180°, 540°, 900°,.... Figure 5 shown, the pressure center of the ejected air at the most upstream side of the weft yarn path 31 is located at point C1. Point C1 is at a distance P1 from the inner side wall surface 31b. At this time, the running efficiency of the weft yarn 21 on the weft yarn path 31 is improved. Therefore, as Figure 6 shown, compared with when the yarn guide angle R is other than 180°, 540°, 900°,...., the pressure of the air required for the weft yarn 21 to reach the target position at the target position arrival time Tw becomes smaller, and the amount of air ejected from the main nozzle 50 can be reduced.

[0045] In addition, by making the positioning portion 53g of the yarn guide 53 a constant position, the air ejection pressure required for the weft yarn 21 to reach the target position at the target position arrival time Tw can be made constant among the loom bodies of multiple air jet looms 100.

[0046] Thus, the weft yarn conveying nozzle according to Embodiment 1 is a weft yarn conveying nozzle in the air-jet loom 100, which ejects the weft yarn 21 into the weft yarn passage 31 by jetting air toward the inlet of the weft yarn passage 31 of the reed 30 having the weft yarn path 31. The weft yarn conveying nozzle includes: a yarn guide 53 having a weft yarn passage 53d for introducing and guiding the weft yarn 21; and a nozzle body 51 that houses the yarn guide 53 and forms an air flow path 55 along the outer peripheral surface of the yarn guide 53 for the air to flow in the direction of the weft yarn passage 53d. In addition, the air flow path 55 is extended to overlap with the downstream traction passage 52d of the weft yarn passage 53d, the cross-section of the weft yarn passage 53d in the yarn guide 53 is circular, and the end portion 53c of the yarn guide 53 is cut by a plane S that obliquely intersects the central axis L of the weft yarn passage 53d. Moreover, the yarn guide 53 has a positioning portion 53g, and the positioning portion 53g indicates the direction corresponding to the normal direction of the plane S at the portion exposed from the nozzle body 51. Therefore, the air jet pressure for causing the weft yarn 21 to reach the target position at the target position arrival time Tw can be made constant among multiple machines.

[0047] In addition, when the positioning portion 53g is in the horizontal direction and in the front side direction of the air-jet loom 100, the positioning portion 53g is formed such that the normal direction M of the plane S is in the horizontal direction and away from the reed 30. Therefore, by tightening the lock nut 54 in this state, the yarn guide 53 can be installed at the yarn guide angle R at which the pressure of the air from the main nozzle 50 required for the weft yarn 21 to reach the target position at the target position arrival time Tw is minimized, and the adjustment of the yarn guide angle R becomes easier.

[0048] Embodiment 2.

[0049] Next, the 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 Embodiment 1 Figures 1 to 6 are used for the same or similar structural elements, and thus, the detailed description thereof is omitted. The air-jet loom of the present Embodiment 2

[0050] changes the angle of the plane S of the deflection inflow portion 53e of the yarn guide 53 provided with the main nozzle 50 according to Embodiment 1.

[0051] is a plan sectional view when observing the main nozzle 50 of Embodiment 2 from above in the vertical direction of the air-jet loom 100 (refer to

[0052] Figure 7 ). Refer to Figure 1 ). Figure 7For the yarn guide 53 of the main nozzle 50, the normal line M orthogonal to the plane S of the deflecting inflow portion 53e provided with the end portion 53c extends in the horizontal direction and toward the rear side of the loom body of the air-jet loom 100, that is, in the horizontal direction and toward the direction close to the arrow Y1 direction, and the point A on the most upstream side of the deflecting inflow portion 53e is located in the direction close to the arrow Y1, that is, in the direction close to the reed 30.

[0053] Figure 8 is a side view of the yarn guide 53 as viewed from the upstream side along the central axis L. If referring to Figure 7 and Figure 7 and Figure 8 when the yarn guide 53 is viewed from the upstream side along the central axis L, the positioning portion 53g of the wheel-shaped portion 53f provided on the yarn guide 53 is formed in a direction obtained by rotating 180° about the central axis L with respect to the direction of the point A on the most upstream side of the deflecting inflow portion 53e with respect to the central axis L. That is, for the yarn guide 53 of the second embodiment, the positional relationship between the positioning portion 53g and the point A is different by 180° with respect to the central axis L from the yarn guide 53 of the first embodiment. Other structures are the same as those of the first embodiment.

[0054] Next, the effects obtained by the second embodiment will be described. As Figure 7 and Figure 8 shown, when air is ejected from the main nozzle 50 in the case where the normal line M orthogonal to the plane S extends in the horizontal direction and toward the direction close to the arrow Y1, as Figure 5 shown, the portion where the pressure of the ejected air is the highest, that is, the pressure center, at the most upstream side of the weft yarn path 31 is located at the point C2. This point C2 is located at a position at a distance P2 from the inner side wall surface 31b, and this distance P2 is longer than the distance P1 between the point C1, which is the pressure center of the ejected air in the first embodiment, and the inner side wall surface 31b.

[0055] As in the second embodiment, when the normal line M orthogonal to the plane S of the deflecting inflow portion 53e of the yarn guide 53 of the main nozzle 50 as Figure 7 shown extends in the horizontal direction and toward the direction close to the arrow Y1 direction, that is, when the yarn guide angle R is 0°, 360°, 720°..., as Figure 5 shown, the pressure center of the ejected air at the most upstream side of the weft yarn path 31 is located at the point C2. At this time, as Figure 6 shown, compared with when the yarn guide angle R is other than 0°, 360°, 720°..., the pressure of the air required for the weft yarn 21 to reach the target position at the target position arrival time Tw becomes larger, and thus, there is an advantage that the weft insertion control of the weft yarn 21 by the main nozzle 50 becomes easier.

[0056] Thus, when the positioning portion 53g is in the horizontal direction and near the front side of the air-jet loom 100, the positioning portion 53g is formed such that the normal direction M of the plane S is in the horizontal direction and near the direction of the variable reed 30. Therefore, the pressure of the air required for the weft yarn 21 to reach 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.

[0057] In addition, in the second embodiment of the present invention, when the yarn guide 53 is viewed from the upstream side along the central axis L, the positioning portion 53g is formed in a direction obtained by rotating 180° around 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, but it is not limited thereto. For example, it may be formed like the yarn guide 53 of the first embodiment such that when the yarn guide 53 is viewed from the upstream side along the central axis L, the line N on which 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 is aligned with the direction in which the positioning portion 53g is located with respect to the central axis L. Using such a yarn guide 53, the yarn guide 53 is fixed at an angle such that the point A on the most upstream side of the deflecting inflow portion 53e is in the direction close to the arrow Y1, that is, in the direction close to the variable reed 30.

[0058] In addition, the yarn guide 53 described in the first and second embodiments of the present invention may be used at any yarn guide angle R other than the yarn guide angles R shown in the first and second embodiments.

[0059] In addition, in the first and second embodiments of the present invention, the positioning portion 53g of the wheel-shaped portion 53f provided on the Figure 2 and Figure 4 shown yarn guide 53 is formed in a conical shape, but it is not limited thereto, and other shapes of positioning portions may be provided instead of the positioning portion 53g. Figure 9 is a plan sectional view showing the positioning portion 53i of the wheel-shaped portion 53f according to the first modification example, Figure 10 is Figure 9 shown side view of the wheel-shaped portion 53f. As Figure 9 and Figure 10 shown, the positioning portion 53i may be formed in a cylindrical shape extending along the radial direction of the wheel-shaped portion 53f. The cylindrical positioning portion 53i can be easily formed by, for example, performing processing on the outer peripheral portion of the wheel-shaped portion 53f using an opening tool such as a drill.

[0060] Figure 11 is a plan sectional view showing the positioning portion 53j of the wheel-shaped portion 53f according to the second modification example, Figure 12 is Figure 11 shown side view of the wheel-shaped portion 53f. As Figure 11 andFigure 12 As shown, alternatively, the positioning portion 53j extends along the central axis L of the main nozzle 50 and is formed in a V-shaped groove shape. The positioning portion 53j in the shape of a V-shaped groove can be easily formed by performing V-grooving on the outer peripheral surface of the wheel-shaped portion 53f along the central axis L of the main nozzle 50.

[0061] In addition, in the above-described embodiments and modification examples of the present invention, the positioning portions 53g, 53i, 53j of the yarn guide 53 are formed on the wheel-shaped portion 53f, but they may also be formed on the portion of the nozzle body 51 exposed between the yarn guide thread portion 53h and the wheel-shaped portion 53f of the yarn guide 53.

[0062] In addition, in Embodiment 1 and Embodiment 2 of the present invention, the deflecting inflow portion 53e of the end portion 53c of the yarn guide 53 is formed by being cut by a plane S that intersects obliquely with the central axis L and faces the downstream side of the yarn guide 53, but it may be formed in other shapes. Figure 13 It is a plan view of the end portion 53c according to the third modification example. As Figure 13 shown, the end portion 53c of the yarn guide 53 may also be cut by a circumferential surface D1 that is a single surface and has a center located on the downstream side of the end portion 53c to form the deflecting inflow portion 53e. In addition, the circumferential surface D1 is a surface that intersects obliquely with the central axis L (refer to Figure 2 ).

[0063] Figure 14 It is a plan view of the end portion 53c according to the fourth modification example. As Figure 14 shown, the end portion 53c may also be cut by a circumferential surface D2 that is a single surface and has a center located on the upstream side of the end portion 53c to form the deflecting inflow portion 53e. In addition, the circumferential surface D2 is a surface that intersects obliquely with the central axis L (refer to Figure 2 ).

[0064] As Figure 13 in the third modification example and Figure 14 in the fourth modification example, when the deflecting inflow portion 53e is formed by cutting the end portion 53c by the circumferential surface D1 or the circumferential surface D2, the same effects as those in Embodiment 1 or 2 can also be obtained by setting the normal line M with respect to the circumferential surface D1 or the circumferential surface D2 in the horizontal direction and in the direction away from or close to the heald frame 30 of the air-jet loom 100 in the same manner as in Embodiment 1 or 2.

Claims

1. A weft yarn delivery nozzle in a jet loom, which ejects a weft yarn into a weft yarn passage by jetting air toward an inlet of the weft yarn passage of a reed having a weft yarn path, wherein the weft yarn delivery nozzle in the jet loom is characterized by comprising: a yarn guide having a weft yarn passage for introducing and guiding the weft yarn; and a nozzle body that houses the yarn guide and forms an air flow path along an outer peripheral surface of the yarn guide for air to flow in a direction of the weft yarn passage, extending the air flow path to overlap a weft yarn path on a downstream side of the weft yarn passage, making a cross section of the weft yarn passage in the yarn guide circular, and cutting an end portion of the yarn guide with a plane obliquely intersecting a central axis of the weft yarn passage, the yarn guide having a display portion at a position exposed from the nozzle body, the display portion displaying a direction corresponding to a normal direction of a plane obliquely intersecting the central axis of the weft yarn passage.

2. The weft yarn delivery nozzle in a jet loom according to claim 1, wherein when the display portion is in a horizontal direction and in a front side direction of the jet loom, the display portion is formed such that a normal direction of a plane obliquely intersecting the central axis of the weft yarn passage is in a horizontal direction and is a direction away from the reed.

3. The weft yarn delivery nozzle in a jet loom according to claim 1, wherein when the display portion is in a horizontal direction and in a front side direction of the jet loom, the display portion is formed such that a normal direction of a plane obliquely intersecting the central axis of the weft yarn passage is in a horizontal direction and is a direction close to the reed.

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