KR20050031845A - Picking nozzle for jet loom - Google Patents

Abstract

A weft inserting nozzle on a jet loom is provided to improve rectification effect of fluid by containing many rectifying walls unified on circumference of a front end of a needle. A weft inserting nozzle on a jet loom contains a main body(14) of a nozzle(10), a weft guiding hole(16) and a needle(20) joined on the main body. The weft inserting nozzle injects a supplied fluid between the main body and the needle. An outer diameter of the needle becomes smaller near a front end. Many rectification walls(18) are unified on circumference of the front end of the needle and are extended from the front end to a weft inserting side.

Description

Weft Insert Nozzle for Fluid Injection Looms {PICKING NOZZLE FOR JET LOOM}

[Technical Field]

The present invention relates in particular to weft insertion nozzles for use in fluid jet looms, such as waterjet looms.

The upstream side of the fluid flowing in the weft insertion nozzle is called the rear end side, and the downstream side is called the front end side.

[Background]

As one of this kind of weft insertion nozzle, weft yarn has a nozzle body, a needle having a weft guide hole through which the weft thread passes, and a needle coupled to the nozzle body, and a ring-shaped stabilizer disposed between the needle and the nozzle body. Insert nozzle is known (Patent Document 1)

(Patent Document 1) Japanese Unexamined Patent Application Publication No. 2001-40551

In this prior art, the stabilizer has a plurality of rectifying walls extending toward the axis of the needle (inward in the radial direction) at intervals from the inside to the circumferential direction. Moreover, the inner side surfaces of the plurality of rectifying walls face the outer peripheral surface of the tip end portion of the needle.

The weft insertion nozzle forms a fluid flow path between the nozzle body and the needle and between the stabilizer and the needle, and between the rectifying wall adjacent to the circumferential direction as the fluid rectification groove, and the fluid supplied to the fluid flow path. After rectifying in the rectifying groove, spray with the weft on the tip side.

Since the above weft insertion nozzles space the plurality of rectifying walls extending in the axial direction and the radial direction of the needle in the circumferential direction, it is considered that the rectifying effect of the fluid in the rectifying groove is considerably high. However, since the inner surface of the distal end of the rectifying wall and the outer peripheral surface of the distal end of the needle have a gap, the rectifying effect of the vicinity of the outer peripheral surface of the distal end of the needle (the fluid flowing inside the distal end of the stabilizer, that is, the fluid effectively acting on the grip of the insertion weft) Is low.

In a fluid jet loom, it is desired to speed up the fluid flow rate as much as the high speed operation is required, and to shorten the weft insertion time. However, such a high-speed fluid is also injected into the outer peripheral surface of the tip of the needle, so that the rectifying effect of the fluid in the vicinity of the outer peripheral surface of the needle is low, and it becomes difficult to maintain stable high-speed weft insertion due to the ultra-high speed operation. As a result, weaving defects due to a weft insertion miss tend to occur.

When changing the thickness of the weft thread used for weft insertion, it is necessary to change the needle with a weft guide hole suitable for the new weft thread. However, in the actual weft insertion nozzle, the size range of the available needle for one nozzle size is determined, and therefore it is difficult to approach the distance between the inner end face of the rectifying wall and the outer peripheral face of the tip end of the needle without limitation.

In addition, whenever the thickness is changed to a different weft yarn, the positional relationship between the needle and the stabilizer, and furthermore, the positional relationship between the needle and the rectifying wall must be finely adjusted. It takes a lot

An object of the present invention is to enhance the fluid rectifying effect even at high speed operation of the loom.

[Means for solving the problem]

The weft insertion nozzle according to the present invention includes a nozzle body and a needle having a weft guide hole and coupled to the nozzle body, and injects a fluid supplied between the nozzle body and the needle. The needle has a smaller needle tip as the outer diameter dimension is smaller, and a plurality of rectifying walls extending radially outward from the needle tip are integrally provided on the needle tip outer periphery.

 [First Embodiment]

1 and 2, the weft insertion nozzle 10 is used for a fluid jet loom (not shown) which inserts the weft 12 into the warp opening.

The weft insertion nozzle 10 includes a needle body 14 having a nozzle body 14, a weft guide hole 16 through which the weft 12 passes, and a plurality of rectifying walls 18 for rectifying the fluid. And an orifice 22 disposed to be positioned between the nozzle body 14 and the needle 20 in the radial direction.

The main body of the nozzle body 14 has a substantially cylindrical shape. The nozzle body 14 has a through hole 24 that penetrates the main body part in the same axis in the axial direction thereof.

The through hole 24 becomes a hole area of radius r1 in the wide center area, and becomes a hole area of radius smaller than the radius r1 in the front end area on its left side, and the radius (in the rear end area on the right side of the center area). It is a screw hole larger than r1).

The nozzle main body 14 has a nozzle support part 26 extending in a direction orthogonal to the axis line of the main body part, and the nozzle support part 26 is provided with a supply flow path 28 communicating with the through hole 24. . The nozzle body 14 is detachably mounted to the nozzle holder of the loom at the nozzle support 26.

The needle 20 includes a needle large diameter portion 30 coupled to the through hole 24, a needle small diameter portion 32 formed on the same axis and integrally on the tip side of the needle large diameter portion, and a tip of the needle small diameter portion. The needle tip 34 is formed integrally with the same axis and integrally on the side.

The needle large diameter portion 30 has a radial dimension r2 approximately equal to the radial dimension r1 of the through hole 24 over the entire length range in the axial direction of the needle large diameter portion.

The needle small diameter portion 32 has approximately the same diameter dimension smaller than the needle large diameter portion 30 over the entire length range in the axial direction of the needle small diameter portion.

The diameter dimension of the needle tip portion 34 is smaller than the diameter dimension of the needle small diameter portion 32 and is gradually reduced toward the tip end continuously.

The needle 20 is detachably assembled to the nozzle main body 14 at the needle large diameter part 30 by the fastener 36 screwed into the screw hole of the nozzle main body 14 from the semi-fluid ejection side (rear end side). Doing.

The weft guide hole 16 penetrates the needle large diameter part 30, the needle small diameter part 32, and the needle tip part 34 in the same axis.

The plurality of pins, that is, the rectifying wall 18 extends in the axial direction at equal angle intervals around the axis of the needle tip 34, and extends radially outward from the outer circumferential surface 58 of the needle tip 34. The needle tip 34 is integrally formed with the needle tip.

The rectifying wall 18 adjacent to the circumferential direction is a rectifying groove 38 for rectifying the fluid. The bottom of each of the rectifying grooves 38 is the axis side of the needle tip portion 34, and therefore, each of the rectifying grooves 38 is open to both the front-rear direction and the outer circumferential side.

The orifice 22 is coupled to the distal end of the central region having the radius r1 of the through hole 24. The needle tip 34 protrudes a portion of the tip side downstream from the injection port 40 of the orifice 22. The rectifying wall 18 is located at the rear end side of the orifice 22.

Each rectifying wall 18 spans the entire length region in the axial direction of the needle 20, and the distance from the axis of the needle 20 to the radially outer end is approximately equal to the radial dimension r1 of the large diameter portion 30 of the needle 20. It is the same. For this reason, each rectifying wall 18 is only a little space | interval with respect to the inner surface of the through-hole 24. As shown in FIG.

The front end surface (downstream end) 42 of the rectifying wall 18 is located behind the front end 44 of the needle front end 34. The rear end face (upstream end) 46 of the rectifying wall 18 is located near the boundary between the needle tip portion 34 and the needle small diameter portion 32.

The needle small diameter part 32 forms the annular flow path 48 which opens in the circumferential direction with the front end surface 50 of the needle large diameter part 30, and the rear end surface 46 of the rectifying wall 18. As shown in FIG. The annular flow passage 48 communicates with the supply flow passage 28 and also communicates with the rectifying groove 38. Boundary between the rear end face 46 of the rectifying wall 18 and the tip end face 50 of the needle large diameter portion 30 and the outer circumferential surface of the needle small diameter portion 32 (groove bottom surface of the annular flow passage 48) 52 The part is semicircular.

The needle large diameter portion 30 has a groove formed in the circumferential direction of the needle large diameter portion, and an O-ring 54 is disposed in the groove. The O-ring 54 closes the nozzle body 14 and the needle 20 without leaking, so that fluid from the supply flow passage 28 does not leak.

The inner space 56 of the orifice 22 is a longitudinal section including the axis of the needle 20 and has an inner surface shape in which the inner diameter dimension becomes larger at the rear end side and becomes wider at the rear end side in a longitudinal section parallel to the axis of the needle, In addition, an arc shape is formed around the boundary between the rear end face and the inner face.

The rectifying wall 18, the needle 20, and the orifice 22 are formed of a corrosion resistant material selected from the group consisting of ceramics, super steel, quenched stainless steel, and cermet.

Weft insertion fluid is led from the pressure fluid source to the annular flow passage 48 of the nozzle body 14 through the supply flow passage 28 of the nozzle support 26, and the rectifying wall 18 adjacent from the annular flow passage 48. It passes through the commutation groove 38 between, and is injected from the injection hole 40 through the outer peripheral surface 58 of the needle tip part 34, and between the inner peripheral surface of the orifice 22.

The rectifying wall 18 suppresses the fluid from becoming turbulent before injection, and forms a high-speed portion of the fluid in an annular bundle by the rectifying grooves 38 between the adjacent rectifying walls 18, The high speed part is held to the injection port 40 in the state of an annular bundle.

The fluid injected into the rectifying groove 38 is throttled and accelerated by an orifice 22 provided separately from the nozzle body 14 on the outer circumferential side of the needle tip portion 34, and the outer circumferential surface 58 of the needle tip portion 34. ) And an injection hole 40 formed by the inner surface of the orifice 22. At this time, the fluid inserts the weft 12 into the warp opening.

Since the weft insertion nozzle 10 integrally forms the plurality of rectifying walls 18 on the outer circumference of the needle tip 34, the fluid from the pressure fluid supply source is formed by the rectifying walls 18 adjacent to the circumferential direction. The bottom surface of the groove of the rectifying groove 38, in other words, becomes the outer circumferential surface 58 of the needle tip portion 34 and is injected. This improves the rectifying effect of the fluid effectively acting on the grip of the inserted weft, and as a result, stable weft insertion becomes possible even at ultra-high speed operation of the weaving machine, the textile defects are markedly reduced, and the consumption is reduced.

In the case of the weft insertion nozzle 10, when the needle 20 is replaced, the rectifying wall 18 is simultaneously exchanged with the needle 20, so that the operation of replacing the needle 20 or repairing the weft insertion nozzle 10 are performed. Inspection work becomes easy.

According to the weft insertion nozzle 10, the needle 20 and the rectifying wall 18 can be integrated in an arrangement and a shape in which the rectifying effect is optimal. Therefore, when the needle 20 is replaced, the weft insertion nozzle 10 At the time of maintenance inspection, the fine adjustment of the needle and stabilizer conventionally required is unnecessary. As a result, the positional accuracy of the rectifying wall 18 with respect to the needle 20 improves, and the precision weft insertion nozzle 10 can be obtained.

According to the weft insertion nozzle 10, the length of the weft insertion direction of the rectifying wall 18 can be easily increased, so that the so-called double stabilizer in which two stabilizers are arranged in series can be provided with a simpler structure. Can be formed.

Second Embodiment

Referring to FIG. 3, instead of the needle 20 shown in FIG. 1, the weft insertion nozzle 60 has the needle small diameter portion 32 and the needle tip portion 34 positioned at the rear end surface 46 of the rectifying wall 18. The needle 62 which is located downstream from the boundary line of this is provided.

Third Embodiment

Referring to FIG. 4, instead of the needle 20 shown in FIG. 1, the weft insertion nozzle 64 is the rear end surface 46 of the rectifying wall 18 at the through-hole 24 side of the nozzle body 14. And a needle 70 having tapered portions 66 and 68 having a tapered shape at the tip end surface 42.

[Example 4]

Referring to FIG. 5, instead of the needle 20 shown in FIG. 1, the weft insertion nozzle 72 has the front end side of the rectifying wall 18 formed in the needle tip 34, and the internal space 56 of the orifice 22. The needle 74 extended to the inside is provided.

The leading end of the rectifying wall 18 and the rear end of the orifice 22 are circular arcs 76 and 78 which face each other and have substantially the same radius of curvature. The circular arcs 76 and 78 are longitudinal sections including the axis of the needle 20, and are formed so that the end portions of the longitudinal section parallel to the axis of the needle 20 become larger toward the rear side.

[Example 5]

6 and 7, instead of the needle 20 shown in FIG. 1, the weft insertion nozzle 80 passes through the end of the rectifying wall 18 adjacent to the through-hole 24 from the through-hole 24. A needle 84 formed integrally with the circumferential member 82 extending along the circumferential direction is provided.

Other Examples

Referring to FIG. 8, like the orifice 90, with respect to the orifice 22 shown in FIG. 1, a plurality of second lines extending in the axial direction at equal angle intervals around the axial direction of the weft insertion nozzle 10. A fin, that is, a second rectifying wall 92 may be formed inside the orifice 90. In this way, since the second commutation wall 92 adjacent to the circumferential direction acts as the second commutation groove 94, the fluid is formed by the commutation wall 92 of the needle 20 and the orifice 90. It is surely rectified.

The rectifying wall 92 of the orifice 90 is formed in the same number as the rectifying wall 18 of the needle 20, and the position of the rectifying wall 92 of the orifice 90 is referred to as the rectifying wall of the needle 20 ( 18) can be arranged to face each other in a one-to-one relationship.

8, although the 2nd rectifying wall 92 is formed in part with respect to the axial direction of the orifice 90, you may form over the whole area | region.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit thereof.

When a plurality of rectifying walls are integrally formed on the outer circumference of the needle tip, the fluid from the fluid source is injected into the bottom face of the rectifying groove formed by the rectifying wall adjacent to the circumferential direction, in other words, the outer circumferential face of the needle tip. This improves the rectifying effect of the fluid that effectively acts on the gripping of the inserted weft, and as a result, stable weft insertion is possible even in ultrafast operation of the loom, and the textile defects are markedly reduced and the consumption is reduced.

In addition, when the needle is replaced, the rectifying wall is simultaneously exchanged with the needle, so that the replacement work of the needle and the maintenance inspection of the weft insertion nozzle can be facilitated.

In addition, since the needle and the rectifying wall can be integrated in the arrangement and shape with the optimum rectifying effect, it is unnecessary to finely adjust the needle and stabilizer, which have been conventionally required when replacing the needle or checking the weft insertion nozzle. Become. As a result, the positional accuracy of the rectifying wall with respect to the needle is improved, and a precise weft insertion nozzle can be obtained.

Moreover, since it becomes easy to enlarge the length of the weft insertion direction of a rectifying wall, what is called a double stabilizer which arrange | positions two stabilizers in series can be formed in a simpler structure.

The needle may further include a needle large diameter portion coupled to the nozzle body, and a needle small diameter portion having a smaller diameter portion extending from the tip side of the needle large diameter portion, the needle small diameter portion having an outer diameter dimension smaller than that of the needle large diameter portion. The needle tip portion may be connected to the tip side of the needle small diameter portion.

The rectifying wall may extend in the axial direction of the needle at intervals in the circumferential direction. In addition, the tip of each rectifying wall may be located on the retreat side than the tip of the needle tip.

At least a portion of each rectifying wall may make the distance from the axis of the needle to the end of the nozzle body side of the rectifying wall approximately equal to the radial dimension of the needle large diameter portion.

In addition, the weft insertion nozzle includes an orifice having an internal space into which a portion of the needle tip is press-fitted, and the orifice is formed integrally or separately from the nozzle body between an outer circumferential surface of the needle tip and an inner surface of the nozzle body. May be

The orifice includes the axis of the needle and is formed so that the larger end spreads as the inner diameter dimension becomes the rear end side in a longitudinal section parallel to the axis, and the inner end surface of the rear end may be arcuate. In this way, the fluid smoothly enters the internal space from the rectifying groove between the rectifying walls, and is throttled and accelerated by the inner surface forming the inner space and the outer peripheral surface of the needle tip.

Part of the rectifying wall may be located in the internal space.

An inner surface of the rear end of the orifice and an inner surface of the tip of the rectifying wall may include an axis of the needle and may have an arc shape in a longitudinal section parallel to the axis. In this way, the fluid smoothly enters the inner space, prevents the fluid from becoming turbulent, throttles more, and accelerates.

The degree of curvature of the arcuate portion of the orifice and the rectifying wall is approximately the same, and the leading end of the rectifying wall may be located inside the rear end of the orifice. In this way, the fluid smoothly enters the internal space, more throttles, and accelerates while reliably preventing the fluid from becoming turbulent.

The orifice integrally has a plurality of second rectifying walls extending radially centrally to form the inner space, the orifice including the axis of the needle and in a longitudinal section parallel to the axis, the inner diameter dimension being the rear end. The larger side may be formed so as to spread. In addition, the inner surface of the front end portion of the rectifying wall provided in the needle and the inner surface of the rear end portion of the second rectifying wall include an axis of the needle and have an arc shape in a longitudinal section parallel to the axis, and provided in the needle. The degree of curvature of the arc-shaped portion of the rectified wall and the second rectified wall is approximately the same, and the tip of the rectified wall provided in the needle may be located inside the rear end of the second rectified wall. . In this way, the fluid is rectified by both rectifying walls.

The rectifying wall provided in the needle and the second rectifying wall may be formed in the same number and may face each other in a one-to-one relationship with each other.

The needle or the rectifying wall may be formed of a corrosion resistant material selected from the group comprising ceramics, super steel, quenched stainless steel and cermet.

1 is a longitudinal sectional view showing a first embodiment of a weft insertion nozzle according to the present invention.

It is a schematic side view which looked the needle of the weft insertion nozzle shown in FIG. 1 upstream from the weft insertion direction downstream.

It is a longitudinal cross-sectional view which shows 2nd Example of the weft insertion nozzle concerning this invention.

It is a longitudinal cross-sectional view which shows 3rd Example of the weft insertion nozzle concerning this invention.

Fig. 5 is a longitudinal sectional view showing the fourth embodiment of the weft insertion nozzle according to the present invention.

It is a longitudinal cross-sectional view which shows 5th Example of the weft insertion nozzle concerning this invention.

It is a schematic side view which looked the needle of the weft insertion nozzle shown in FIG. 6 upstream from the weft insertion direction downstream.

It is a longitudinal cross-sectional view which shows the modification of the orifice of the weft insertion nozzle which concerns on this invention.

* Explanation of the main symbols in the drawings

10, 60, 64, 72, 80: weft insertion nozzle

14: nozzle body

16: weft guide hole

18: rectifying wall

20, 62, 70, 74, 84: needle

22, 90: orifice

24: through hole of nozzle body

26: nozzle support

28: supply euro

30: Needle large diameter

32: needle small diameter

34: needle tip

36: Fixture

38: commutation groove

40: nozzle

42: front end surface of the rectifying wall (downstream end)

44: tip of needle tip

46: Rear section of the rectifying wall (upstream end)

48: annular euro

50: tip section of needle large diameter part

52: outer peripheral surface of the needle small diameter part

54: O ring

56: internal space of the orifice

58: outer peripheral surface of the needle tip

66, 68: taper of rectifying wall

76, 78: arc

82: circumferential member

92: second rectifying wall

94: second commutation groove

Claims (14)

A weft insertion nozzle of a fluid jet loom having a nozzle body, a needle having a weft guide hole and coupled to the nozzle body, and for injecting a fluid supplied between the nozzle body and the needle, The needle has a needle tip portion having a smaller outer diameter dimension and a fluid injection type loom having a plurality of rectifying walls extending radially outwardly from the needle tip portion on the needle periphery outer periphery. Weft insert nozzle. The method of claim 1, The needle further includes a needle large diameter portion coupled to the nozzle body, and a needle small diameter portion having a needle small diameter portion extending from the tip side of the needle large diameter portion, the needle small diameter portion having an outer diameter dimension smaller than the outer diameter dimension of the needle large diameter portion; A tip end portion is a weft insertion nozzle that is connected to the tip side of the needle small diameter portion. The method according to claim 1 or 2, And the rectifying wall extends in the axial direction of the needle at intervals in the circumferential direction. The method according to claim 1 or 2, Weft insertion nozzle is located at the rear end side of the front end of each of the rectifying wall of the needle tip. The method according to any one of claims 1 to 4, At least a portion of each rectifying wall makes the distance from the axis of the needle to the end of the nozzle body side of the rectifying wall approximately equal to the radial dimension of the needle large diameter portion. The method according to any one of claims 1 to 5, And an orifice having an inner space into which a portion of the needle tip is press-fitted, wherein the orifice is formed integrally or separately from the nozzle body between an outer circumferential surface of the needle tip and an inner surface of the nozzle body. . The method of claim 6, And the orifice includes an axis of the needle and is formed such that a larger end spreads as the inner diameter dimension is larger at the rear end side in the longitudinal section parallel to the axis line, and the rear end end is arc-shaped. The method according to claim 6 or 7, And a portion of each rectifying wall is located in the interior space. The method according to any one of claims 6 to 8, A weft insertion nozzle having an arcuate shape in a longitudinal section parallel to the axis and including an axis of the needle and an inner surface of the rear end of the orifice and the front end of the rectifying wall. The method of claim 9, The degree of curvature of the arc-shaped portion of the orifice and the rectifying wall is approximately the same, and the tip end of each rectifying wall is located inside the rear end of the orifice. The method of claim 6, The orifice integrally has a plurality of second rectifying walls extending toward the radial center to form the inner space, And the orifice includes the axis of the needle and is formed such that a larger end spreads toward the rear end side in a longitudinal section parallel to the axis. The method of claim 11, The inner surface of the front end portion of the rectifying wall provided on the needle and the inner surface of the rear end portion of the second rectifying wall include an axis of the needle and have an arc shape in a longitudinal section parallel to the axis. The degree of curvature of the arc-shaped portion of the rectifying wall and the second rectifying wall provided in the needle is approximately the same, and the tip portion of the rectifying wall provided in the needle is inside the rear end of the second rectifying wall. Positioned weft insertion nozzle. The method according to claim 11 or 12, wherein And a plurality of the rectifying wall and the second rectifying wall provided in the needle are formed to face each other so as to face each other in a one-to-one relationship. The method according to any one of claims 1 to 13, And said needle or said rectifying wall is formed of a corrosion resistant material selected from the group consisting of ceramics, super steel, quenched stainless steel and cermet.