JP3103758B2 - Method and apparatus for measuring jet direction in air jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft flight path of a jet of air jetted from a weft insertion auxiliary nozzle in a weft insertion flight path formed by arranging a large number of reeds in the weft insertion direction. Method and apparatus for measuring a profile in a device.

[0002]

2. Description of the Related Art FIG. 14 shows a weft insertion device using a modified reed having a weft flight passage. A deformed reed 12 is erected and fixed on the slay 11. The modified reed 12 is configured by arranging a large number of reeds 13 in a row in the weft insertion direction. Each reed 1
3 is provided with a guide hole 14, and the guide hole 1
Four rows form a weft flight path T. The weft Y ejected from the weft insertion main nozzle 15 flies in the weft flight path T. The guide hole 14 includes a horizontal upper wall 141, a vertical rear wall 142, a bottom wall 143 which gradually become inclined downward toward the opening 14 6 side of the guide hole 14, the upper wall 141 and rear wall 142 It is formed by the upper corners 144 of the curved surface connecting a lower corner portion 14 5 of the curved surface connecting the rear wall 142 and lower wall 143. Each of these wall surfaces 141 to 145 forms a wall surface of the weft flight passage T.

A plurality of weft insertion auxiliary nozzles 16 are mounted on the front surface of the slay 11 at predetermined intervals along a weft flight path T. An injection hole 161 is formed at the tip of the weft insertion auxiliary nozzle 16. The main flow of injection from the injection hole 161 is directed obliquely along the weft flight path T as indicated by an arrow S in FIG. The main injection flow S indicates the locus of the maximum flow velocity point of the air jet injected from the weft insertion auxiliary nozzle 16. The main jet S flows obliquely from the position below the opening 146 of the weft flight passage T toward the downstream side of the weft flight passage T, and reaches the vicinity of the upper corner 144 before turning toward the opening 146. Instead, the process proceeds to the downstream side of the weft flight passage T. Such air injection is sequentially repeated for each weft insertion auxiliary nozzle 16, and the weft Y ejected by the weft insertion main nozzle 15 is divided into a plurality of weft insertion auxiliary nozzles 1.
It is conveyed to the weft insertion end by the relay injection of No. 6.

[0004] The direction of the air jet jetted from the weft insertion auxiliary nozzle 16 greatly affects the stability of the conveyance of the weft Y and the efficiency of air consumption. Therefore, it is important to measure the directional direction of the air jet injected from the weft insertion auxiliary nozzle 16. This measuring method includes a weft flight path T
A pitot tube with a small diameter and a probe of a hot-wire anemometer are inserted into the inside, and these are traversed in up, down, front, back, left and right directions using a three-dimensional moving device, and the relationship between the position in the flight path and the air velocity. There is a way to ask. However, although this measurement method has high measurement accuracy, there is a problem that it takes too much time for the measurement in addition to a large-scale apparatus.
It was not practical.

[0005] Practical methods and devices for measuring the directivity of the air jet injected from the weft insertion auxiliary nozzle include:
There are methods and apparatuses disclosed in JP-A-6-41846, JP-A-6-73641, and JP-A-61-174455.

In the measuring method and apparatus disclosed in Japanese Patent Application Laid-Open No. 6-41846, a pressure-sensitive film that causes a physical change due to air pressure is used for measuring the directional direction of an air jet. This pressure-sensitive film changes the color density according to the pressure, and by using such a pressure-sensitive film, the directional direction of the air jet can be visually determined.

In the method and the measuring device disclosed in Japanese Patent Application Laid-Open No. Hei 6-73641, a single pitot tube is traversed two-dimensionally in a longitudinal direction and a lateral direction in a weft flight passage by a motor to obtain a flow velocity distribution. Measurement is performed, and based on this measurement, a defect determination of the directivity of the air jet from the weft insertion auxiliary nozzle is performed.

[0008] Among the devices disclosed in Japanese Patent Application Laid-Open No. 61-17445, in the device shown in the second embodiment, nine bundled pitot tubes are arranged in the weft flight passage, and the weft flight passage is provided. Is measured in one cross section.

[0009]

However, Japanese Patent Application Laid-Open No. 6-4 / 1994
In the method and apparatus disclosed in Japanese Patent No. 1846, since the pressure-sensitive film blocks the weft flight passage, the air flow in the weft flight passage is disturbed and changes from the original flow. For this reason, there is a problem in that an accurate jet direction at the measurement position where the pressure-sensitive film is arranged cannot be obtained, and the value of the jet intensity reflecting element such as wind pressure or flow velocity cannot be determined. Also, since a pressure-sensitive film that has been used once cannot be used repeatedly, it is not suitable for use in adjusting the mounting angle of an auxiliary nozzle for weft insertion.

In the method and apparatus disclosed in Japanese Patent Application Laid-Open No. 6-703641, the pitot tube cannot be traversed in the vertical direction of the weft flight passage. When it arrives, it is impossible to measure its arrival point. Moreover, it takes a lot of time to measure and determine the directing direction of the air jet, which is not suitable for adjusting the mounting angle of the weft insertion auxiliary nozzle.
In the apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 61-174455, nine pitot tubes are arranged at regular intervals in the weft flight passage, so that they are suitable for measuring the directing direction of the air jet. However, since the pitot tube is located away from the wall of the weft flight passage near the center, the profile of the air flow near the wall of the weft flight passage, which has an important effect on the transport performance, cannot be grasped. is there. In addition, an appropriate data display method for the nine Pitot tubes is not shown, which is not practical.

By the way, the applicant of the present application has proposed a weft insertion auxiliary nozzle 16 in order to efficiently and stably convey the weft Y.
It has been experimentally confirmed that it is preferable that the main jet S of the air jet from the jet is jetted to a fixed position near the upper corner 144 of the weft running path T. The results of this experiment are described in Japanese Patent Application No. 7-117411 filed by the present applicant.

The present invention has been conceived from a new viewpoint of paying attention to the results of this experiment. The velocity and profile of the air jet injected from the weft insertion auxiliary nozzle near the wall surface of the weft flight passage are considered. It is an object of the present invention to provide a method and an apparatus for measuring a jet directional direction which can accurately and quickly measure a jet direction.

[0013]

According to the first aspect of the present invention, a number of reeds are arranged in a row in a weft insertion direction to form a weft flight path.
With a reed forming the upper wall, the inner wall, and the lower wall.
Air from the weft insertion auxiliary nozzle into the weft flight passage
In the jetting air jet loom, the weft
An upper wall of the weft flight passage at a plurality of cross-sectional positions of the road;
At least above the weft flight path along the back wall from the surface
At the plurality of positions including near the corner, the weft insertion auxiliary nozzle
The jet intensity reflecting element of the air jet is referred to the plurality of cross-sectional positions.
Each time, in the vicinity of the upper corner of the weft flight path
Breakage of the weft flight path where the jet intensity reflecting element is the highest
Surface position, near the upper corner of the weft flight path.
Reflection of Jet Intensity at Other Positions on Jet Intensity Reflecting Element
Based on the difference from the element
The direction of the air jet was grasped .

According to the first aspect of the invention, the jet strength reflecting element such as the wind pressure or the wind speed of the jet from the weft insertion auxiliary nozzle is detected at a plurality of positions from the upper wall surface to the inner wall surface.

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021] In the present invention of claim 2, a plurality of pitot tube to detect a plurality of jet strength reflecting element along the inner wall surface from the upper wall surface of the running weft passage arranged, among the plurality of Pitot tube, the A digital display for displaying a value of the jet intensity reflecting element measured by a pitot tube arranged near an upper corner of the weft flight passage; and a jet intensity reflecting element near the upper corner of the weft flight passage. And a bar graph display for level-displaying the difference between the values of the jet intensity reflecting elements at the other plural positions with respect to the value of the jet direction.
According to this configuration, from the upper wall surface to the inner wall surface of the weft flight passage
Jet intensity reflection factors at multiple locations were measured.
You. Then, the difference between the detected jet flow intensity reflection elements at a plurality of positions is displayed as a level. By such a level display, the flow profile near the wall surface of the weft flight passage can be understood,
From the distribution state of the jet intensity reflecting element, the position of the highest intensity of the jet intensity reflecting element at the cross-sectional position of the weft flight passage can be grasped. The jet directing direction can be grasped by displaying the level of the difference between the jet intensity reflecting elements at a plurality of cross-sectional positions of the weft flight passage.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The same components as those in FIG. 14 are denoted by the same reference numerals.

The reed 13 constituting the deformed reed 12 has a thickness of 0.2 mm, and a wind pressure display box 17 is provided via a guide 18 above the deformed reed 12 in which the reeds 13 are densely arranged. It is placed movably in the weft insertion direction. The wind pressure display box 17 has a digital display 19 and a bar graph display 20. The jet directing method measuring apparatus according to the present embodiment includes a wind pressure detecting unit 37, a sensor unit 43, a differential pressure calculating unit 44, and a wind pressure display unit 66 shown in FIG. 3, and includes a digital display 19 and a bar graph display. 20 constitutes a wind pressure display section 66.

A support 21 is attached to the lower end of the guide 18. The lower portion of the support 21 is inserted into the weft flight passage T so as to contact the upper wall surface 141 and the inner wall surface 142 of the weft flight passage T. Two pitot tubes 22 and 23 are fixedly supported on the vertical portion 211 of the support 21 that is in contact with the back wall 142, and the support 21 that is in contact with the upper wall 141 is provided.
Two pitot tubes 25 and 26 are fixedly supported by the horizontal portion 212. The pitot tube 24 is fixedly supported at the intersection of the vertical portion 211 and the horizontal portion 212. These pitot tubes 22 to 26 are all arranged in parallel to the weft flight path T. Each pitot tube 22-26
From the support 21 to the upstream side of the weft flight path T
They protrude about mm and are flush with each other.

The outer diameter of each of the pitot tubes 22 to 26 is 0.7 mm. The centers 221 and 231 of the pitot tubes 22 and 23 are 0.4 mm away from the inner wall surface 142 and the pitot tubes 25 and
The centers 251 and 261 of the tubes 26 are located at a distance of 0.
4mm away. The center 241 of the pitot tube 24 is 0.4 mm away from the wall surface of the upper corner 144. These pitot tubes 22 to 26 constitute a wind pressure detecting unit 37 shown in FIG.

Flexible tubes 27, 28, 29, 30, 31 are connected to the base ends of the pitot tubes 22 to 26, respectively. Gauge pressure sensors 32, 33, 34, 35, 36 and differential pressure calculator 3 are provided in wind pressure display box 17.
8, 39, 40, 41 and 42 are built-in.

As shown in FIG. 4, the pitot tube 22 is connected to a gauge pressure sensor 32 via a flexible tube 27, and the pitot tube 23 is connected to a gauge pressure sensor 33 via a flexible tube 28. The pitot tube 25 is connected to a gauge pressure sensor 35 via a flexible tube 30, and the pitot tube 26 is connected to a gauge pressure sensor 36 via a flexible tube 31. The pitot tube 24 is connected to a gauge pressure sensor 34 via a flexible tube 29. Each of the gauge pressure sensors 32 to 36 converts the wind pressure measured by the pitot tubes 22 to 26 into a voltage signal and outputs the voltage signal. These gauge pressure sensors 32 to 36 constitute a sensor unit 43 shown in FIG.

The differential pressure calculator 38 includes gauge pressure sensors 32, 3
The differential pressure calculator 37 calculates the difference between the wind pressure values obtained from the gauge pressure sensors 33 and 34. The differential pressure calculation value 41 calculates the difference between the wind pressure values obtained from the gauge pressure sensors 35 and 34, and the differential pressure calculator 42 calculates the difference between the wind pressure values obtained from the gauge pressure sensors 36 and 34. Further, the differential pressure calculator 40 takes in only the wind pressure value information obtained from the gauge pressure sensor 34. These differential pressure calculators 38
42 constitute a differential pressure calculating section 44 shown in FIG.

The voltage signal output from the gauge pressure sensor 34 is also taken into the digital display 19. The digital display 19 digitally displays the wind pressure value measured by the pitot tube 24 among the wind pressure values measured by the pitot tubes 22 to 26 as a representative value. 987mm in the case shown
Aq is displayed. This digital display value indicates the wind pressure value near the upper corner 144 of the weft running path T.

The wind pressure difference calculated by the differential pressure calculator 44 is displayed on the bar graph display 20 as a level. The bar graph display 20 has bar graph displays 201, 202, 203, 204, and 205 in which light emitting elements (LEDs) are vertically arranged in 12 stages.
It has. The wind pressure difference calculated by the differential pressure calculator 38 is displayed on the bar display section 201 with light emission, and the wind pressure difference calculated by the differential pressure calculator 39 is displayed on the bar display section 202 with light emission. The wind pressure difference calculated by the differential pressure calculator 41 is displayed on the bar display unit 204 by light emission, and the wind pressure difference calculated by the differential pressure calculator 42 is displayed on the bar display unit 205 by light emission. The wind pressure difference calculated by the differential pressure calculation 41 is displayed on the bar display unit 204 by light emission, and the wind pressure difference calculated by the differential pressure calculator 42 is displayed on the bar display unit 205 by light emission. The wind pressure difference calculated by the differential pressure calculator 40 is always 0, but the wind pressure difference 0 calculated by the differential pressure calculator 40 is displayed on the bar display unit 203 by emitting the LED from the bottom to the eighth stage. . Other bar display units 201, 202, 20
4, 205, the differential pressure calculators 38, 39, 41, 4
When the wind pressure difference calculated in Step 2 is 0, the LEDs emit light from the bottom to the eighth stage. That is, the wind pressure difference 0 is LED
Are displayed in eight stages of light emission.

LE in each bar display section 201-205
Light emission or extinction of D is performed in units of a wind pressure difference of 25 mmAq. For example, when the wind pressure value measured by the pitot tube 24 is 987 mmAq and the wind pressure value measured by the pitot tube 23 is 1037 mmAq, the wind pressure value measured by the pitot tube 23 is measured by the pitot tube 24. 50 mmAq larger than the wind pressure value. Therefore, in the bar display unit 202, the LEDs in the ten rows from the bottom emit light.

Next, a description will be given of a method of measuring the direction of air jet flow in this embodiment. With the loom stopped, air is first injected from the weft insertion auxiliary nozzle 16 by manual operation. In this injection state, the wind pressure display box 17 is slid over the deformed reed 12, and the weft insertion direction where the wind pressure value becomes the highest downstream of the auxiliary nozzle 16 to be measured (FIG. 1)
In the direction indicated by X). X indicates the distance from the weft insertion auxiliary nozzle 16 to be measured to the downstream side. The position of the maximum wind pressure value thus obtained in the weft insertion direction is the position where the maximum velocity point of the air jet is reached.

FIGS. 5 (a), 6 (a), 7 (a) and 8 (a) show that the auxiliary weft insertion nozzle 16 has a pressure of 3 kgf / kg.
FIG. 4 shows a wind pressure distribution diagram obtained by traversing a single pitot tube in a weft flight passage T using a three-dimensional moving device while injecting air at cm ² . FIG. 5A shows the wind pressure distribution at the cross-sectional position of the weft flight passage T at a distance X = 50 mm downstream from the weft insertion auxiliary nozzle 16, and FIG.
5 shows the wind pressure distribution at the cross-sectional position of the weft flight passage T at a distance X = 60 mm downstream from the weft insertion auxiliary nozzle 16. FIG. 7A shows the wind pressure distribution at the cross-sectional position of the weft flight passage T represented by X = 70 mm, and FIG.
(A) shows the wind pressure distribution at the cross-sectional position of the weft flight passage T indicated by X = 80 mm. FIG. 5 (a), FIG.
(A), the numbers in the weft flight passage T in FIGS. 7 (a) and 8 (a) indicate wind pressure values expressed in mmAq units.

A wind pressure distribution diagram by a measurement method in which one pitot tube is traversed by a three-dimensional moving device reflects the actual wind pressure distribution with extremely high accuracy. The maximum flow velocity point of the air jet reaches the upper corner 144 at a position X = 60 mm downstream from the weft insertion auxiliary nozzle 16, and then changes its direction to open the opening 1.
It has shifted to the 46 side. At this time, the vicinity of the upper corner 144 (that is, y = 1m when displayed in the illustrated coordinate system yz)
The change in the wind pressure value (m, z = 1 mm) shows that the wind pressure value is highest at the position of X = 60 mm where the maximum velocity point of the air jet reaches the upper corner 144.

FIGS. 5 (b), 6 (b), 7 (b) and 8 (b) show the results obtained using the measuring apparatus of the present embodiment. The injection pressure at the weft insertion auxiliary nozzle 16 is 3 kgf / cm ² .

The measurement results in the present embodiment shown in FIGS. 5 (b), 6 (b), 7 (b) and 8 (b) are shown in FIGS. 5 (a) and 6 (a). 7 (a) and 8
The measurement result represented by (a) is faithfully represented. That is,
According to the measuring method and device of the present embodiment, the turbulence of the air flow in the weft flight passage T is very small, and a highly accurate measurement result of the wind pressure distribution can be obtained. Auxiliary nozzle 1 for weft insertion
Bar graph display 2 at the position of X = 60 mm downstream of 6
Looking at the display height of 0, the wind pressure value measured by the pitot tube 24 is the highest. This fact is illustrated by FIG. That is, the level display of FIG.
The maximum velocity point of the air jet indicated by the wind pressure distribution shown in FIG. FIG.
The display of the level of the wind pressure difference and the display of the representative value shown in (b), FIG. 6 (b), FIG. 7 (b) and FIG. 8 (b) enable quick grasp of the jet flow direction.

In this embodiment, each of the pitot tubes 22 to
The centers 221 to 261 of the 26 tubes are arranged within a range of 0.4 mm from the wall surface of the weft flight passage T to the side of the weft flight passage T. According to experiments, the arrangement position is 1 mm or less from the wall surface. I found it good. The closer the center of the position for detecting the wind pressure, which is the jet strength reflecting element, to the wall surface of the weft flight passage T, the more accurately the point where the maximum velocity point of the air jet from the weft insertion auxiliary nozzle 16 reaches the wall surface is increased. I can grab it. The center of the detection position, that is, the center 221 of each of the pitot tubes 22 to 26
If 261 is more than 1 mm away from the wall surface, the measurement accuracy of the arrival position decreases.

From the above description, the following effects of the first embodiment can be obtained. (1) Without using a special recorder such as a pen recorder,
The directional direction and wind pressure value of the jet of the weft insertion auxiliary nozzle can be obtained accurately and quickly. (2) The adjustment of the injection angle of the weft insertion auxiliary nozzle can be easily changed on the actual machine, and the abnormality of the weft insertion auxiliary nozzle and the reed can be easily checked. (3) Since the pitot tube is thin and its tip protrudes sufficiently upstream from the support 21, the turbulence of the air jet in the measurement area in the weft flight passage T is very small, and highly accurate wind pressure measurement can be performed. Done.

Next, a second embodiment will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals. The arrangement of the pitot tubes 22 to 26 is the first
Pitot tube 24 which is the same as that of the embodiment and serves as a reference value
The 5 port branch pipe 45 has a flexible tube 29
Connected through. A gauge pressure sensor 34 is connected to one port of the branch pipe 45, and differential pressure sensors 46, 47, 48, and 49 are connected to the other four ports. The differential pressure sensors 46, 47, 48, 49 are connected to the pitot tubes 22, 23, 25, 26 via flexible tubes 27, 28, 30, 31. The gauge pressure sensor 34 and the differential pressure sensors 46 to 49 constitute a sensor unit 43 shown in FIG.

The differential pressure sensor 46 outputs a voltage signal corresponding to the difference between the wind pressures measured by the pitot tubes 22 and 24 to the operational amplifier 5.
Output to 0. The differential pressure sensor 47 is a pitot tube 23, 24.
A voltage signal corresponding to the difference of the wind pressure measured by the above is output to the operational amplifier 51. The differential pressure sensor 48 is a pitot tube 25, 2
A voltage signal corresponding to the difference between the wind pressures measured in Step 4 is output to the operational amplifier 52. Further, the differential pressure sensor 49 is a pitot tube 2
A voltage signal corresponding to the difference between the wind pressures measured by 6 and 24 is output to the operational amplifier 53. These operational amplifiers 50 to 5
Reference numeral 3 together with the reference voltage setting unit 54 constitute a differential pressure calculating unit 44 shown in FIG.

The operational amplifiers 50, 51, 52 and 53 compute and amplify the voltage signals obtained from the differential pressure sensors 46, 47, 48 and 49 and output the amplified signals to the bar graph display 55. Further, the reference voltage setting device 54 outputs a voltage signal of the set value to the bar graph display 55. Bar display sections 551, 552, 553, 554, 555 in the bar graph display 55
Are configured by stacking 20 LEDs. The bar display unit 553 causes the LEDs to emit light from the bottom to the 14th stage with respect to the reference voltage value set by the reference voltage setting unit 54. The 14-step light emission of the LEDs on the display unit 553 corresponds to the wind pressure value measured by the pitot tube 24. Light emission or extinction of the LEDs in the bar display units 551, 552, 554, and 555 is performed in units of a wind pressure difference of 10 mmAq. In this embodiment, the level display on the bar display section 553 is performed based on the wind pressure value obtained from the pitot tube 24 in which the wind pressure in the vicinity of the upper corner 144 is measured.
4 is always displayed at a constant value. In this embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained. (1) By employing the differential pressure sensors 46 to 49, the measurement accuracy of the wind pressure difference becomes higher than in the case of the first embodiment. (2) Since the bar graph display 55 displays the LED in 20 steps, the display resolution of the wind pressure difference is higher than in the case of the first embodiment.

In each of the embodiments described above, the LED is used for indicating the level of the wind pressure difference, but a liquid crystal (LC) is used instead of the LED.
D) may be used. Further, in each of the above embodiments, five pitot tubes for detecting the wind pressure are used, but the number may be at least three. However, as the number of pitot tubes increases, the measurement resolution of the position at which the highest velocity point of the air jet reaches the wall surface of the weft flight passage increases.

Next, a third embodiment shown in FIG. 10 will be described. In this embodiment, the pitot tubes 56, 57, 58, 59, and 60 constituting the wind pressure detecting section 37 are arranged in a concentrated manner on the inner wall surface 142 side of the weft flight passage T. Upper corner 1
The measurement of the wind pressure near 44 is performed by a pitot tube 57.

According to this embodiment, it is effective when the maximum velocity point of the air jet from the weft insertion auxiliary nozzle is made to accurately reach the inner wall surface 142 side. next,
A fourth embodiment shown in FIG. 11 will be described. In this embodiment, pitot tubes 61, 62,
63, 64, 65 are arranged concentrated on the upper wall surface 141 side. The wind pressure measurement near the upper corner 144 is performed by the pitot tube 62.

This embodiment is effective when the highest flow velocity point of the jet from the weft insertion auxiliary nozzle reaches the upper wall surface 141 accurately. Next, FIG.
A second fifth embodiment will be described. The same components as those in the first embodiment are denoted by the same reference numerals.

In this embodiment, a large number of mounting holes 213 are formed in the support 21. Pitot tubes 22, 23,
24, 25, and 26 are selectively mounted in any of these mounting holes 213 and supported. Therefore, it is possible to select a method of detecting the wind pressure as in the first embodiment, the third embodiment or the fourth embodiment.

Next, a sixth embodiment shown in FIG. 13 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, the vertical portion 21 of the support 21 is
Pitot tube 2 from the wall surface 1 or the wall surface of the horizontal portion 212
Pitot tubes 22 to 26 are supported by a support 21 so that a part of the peripheral surface of 2, 23, 24, 25, 26 is exposed. Accordingly, the peripheral surface of each of the pitot tubes 22 to 26 comes into contact with the wall surface of the weft flight passage T, and the center of each of the pitot tubes 22 to 26 comes closest to the front wall surface. Such a closest approach maximizes the detection accuracy of the position where the maximum velocity point of the air jet from the weft insertion auxiliary nozzle reaches the wall surface.

[0048]

Further, in the present invention, instead of the wind pressure, which is a jet intensity reflecting element, the wind speed, which is a jet intensity reflecting element, may be measured using a probe of a hot wire anemometer.

[0050]

As described in detail above, in the present invention, the jet strength reflecting element such as the wind pressure or the wind speed is measured from the upper wall surface to the inner wall surface of the weft flight passage, so that the efficient and stable transport of the weft is achieved. The direction of the jet flow from the weft insertion auxiliary nozzle required for the above can be accurately and quickly obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment.

FIG. 2 is an enlarged side view of a main part showing an arrangement state of pitot tubes in a weft flying passage.

FIG. 3 is a block diagram of a jet directional measurement device.

FIG. 4 is a configuration diagram of a jet directional measurement device.

FIG. 5 (a) is a wind pressure distribution diagram in a weft flight passage. (B)
7 is a level display diagram showing a measurement result according to the present invention.

FIG. 6 (a) is a wind pressure distribution diagram in a weft flight passage. (B)
7 is a level display diagram showing a measurement result according to the present invention.

FIG. 7A is a wind pressure distribution diagram in a weft flight passage. (B)
7 is a level display diagram showing a measurement result according to the present invention.

FIG. 8 (a) is a wind pressure distribution diagram in a weft flight passage. (B)
7 is a level display diagram showing a measurement result according to the present invention.

FIG. 9 is a configuration diagram of a jet directional measurement device showing a second embodiment.

FIG. 10 is an enlarged side view of a main part showing an arrangement state of pitot tubes in a weft flight passage according to the third embodiment.

FIG. 11 is an essential part enlarged side view showing an arrangement of pitot tubes in a weft flight passage according to a fourth embodiment.

FIG. 12 is an enlarged perspective view of a main part showing a fifth embodiment.

FIG. 13 is an enlarged side view of a main part showing a sixth embodiment.

FIG. 14 is a perspective view showing a weft insertion device in an air jet loom.

[Explanation of symbols]

12 ... deformed reed, 141 ... upper wall surface, 142 ... inner wall surface, 14
Reference numeral 4: upper corner portion, 16: auxiliary nozzle for weft insertion, 19: digital display for displaying a representative value of a jet intensity reflecting element, 20
... A bar graph display for displaying the difference of the jet strength reflecting elements at a level, 22 to 26. Pitot tubes, 221-261..., The center of the detection position, 37.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masao Shiraki 2-1-1, Toyota-cho, Kariya-shi, Aichi Pref. 4-153341 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D03J 1/00 D03D 47/30

Claims (3)

(57) [Claims] 1. A with multiple rows set the dents in the weft inserting direction includes a reed to form a running weft passage, the upper wall, the auxiliary nozzle weft insertion into the running weft passage consisting of the back wall and bottom wall In an air jet loom that injects air from the weft flight passage, at a plurality of cross-sectional positions of the weft flight passage, at least the weft extends from the upper wall surface to the inner wall surface of the weft flight passage.
Said jet strength reflecting elements of the air jets from the auxiliary nozzle the weft insertion at a plurality of positions including upper corners near the Itohihashi path
The upper angle of the weft flight path is detected at each of a plurality of cross-sectional positions.
Where the jet intensity reflection factor near the head is highest
At the cross-sectional position of the yarn flight path, above the weft flight path
Other positions for the jet intensity reflecting element near the corner
The weft insertion assistance based on the difference from the jet strength reflection factor
A method for measuring the direction of a jet in an air jet loom to determine the direction of the air jet from a nozzle . 2. A weft insertion auxiliary nozzle provided in a weft flight passage comprising an upper wall surface, a back wall surface, and a lower wall surface. ejecting air from the jet orientation measuring apparatus for use in an air jet loom, by arranging a plurality of pitot tube to detect a plurality of jet strength reflecting element so on along the wall to the back wall of the running weft passage, wherein The upper corner of the weft flight passage among a plurality of pitot tubes
The jet measured by a pitot tube located near the lip
A digital indicator for displaying the value of the intensity reflection element,
The value of the jet intensity reflecting element near the upper corner of the yarn flight passage
The difference between the values of the jet intensity reflection
A jet direction measuring device for an air jet loom, comprising a bar graph display for displaying a bell . 3. The weft jump of the plurality of pitot tubes.
Measured with a pitot tube located near the upper corner of the runway
Digital table displaying the value of the jet intensity reflecting element
Indicator and the jet strength near the upper corner of the weft flight path
Reflection of Jet Intensity at Other Multiple Positions to the Value of Degree Reflection Element
A bar graph display for displaying the level difference of elementary values
Jet finger in the air jet loom according to claim 2
Direction measurement device.