JPH0641846A - Method for measuring jet stream of fluid-jet loom and apparatus therefor - Google Patents

Abstract

PURPOSE:To easily and surely determine the pressure, direction, etc., of a jet flow ejected from a fluid ejection nozzle. CONSTITUTION:The objective apparatus is provided with a pressure-sensitive film 16 developing physical change by the application of pressure and a holding member 18 to detachably hold the pressure-sensitive film at an arbitrary position on the path of a jet flow ejected from a fluid ejection nozzle 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet flow measuring method and a jet flow measuring device for measuring a pressure distribution of a fluid jetted from a fluid jet nozzle of a fluid jet loom, a jet direction, a characteristic of a fluid path and the like.

[0002]

2. Description of the Related Art Conventionally, as a method for measuring the fluid jetting direction and jetting performance of a nozzle of a fluid jet loom, there is disclosed in Japanese Patent Laid-Open No.
As disclosed in Japanese Patent No. 104743 or Japanese Patent Laid-Open No. 60-209049, a pressure sensor for electrically detecting a fluid pressure is provided on the fluid path of a jet fluid for weft conveyance, and a plurality of pressure sensors are provided. Alternatively, a single pressure sensor is moved to measure the pressure distribution and the like of the ejected fluid. Since this pressure data is obtained as an electric signal, a processing system having a display, a printer and the like has been formed to process the data and display it as visible information. Further, as disclosed in Japanese Patent Application Laid-Open No. 19545/1990, a method and a device for measuring the performance of a fluid ejection nozzle by using a pressure sensor in the same manner as above have been proposed. Further, as disclosed in JP-A-61-167052, JP-A-61-167063, and the like, the flow velocity distribution of the jet airflow of an air-jet loom and the state of the fluid path by the reed blade row are determined. Measuring devices have also been proposed. In an air-jet loom, this device allows the air flow to pass through the guide grooves formed in the so-called modified reed blade row, so the shape and dirt of the guide grooves also affect the air flow. And the condition of the reed blade row. In the measurement of the air jet, a pitot tube and a pressure sensor are used to measure the flow velocity and the pressure distribution in the guide groove by the reed blade row.

[0003]

In the case of the above-mentioned conventional technique, in order to measure the pressure distribution and direction of the injected fluid,
Since a pressure sensor is used, a data processing system for the sensor and a system for converting the sensor output into visible information are required, which complicates the overall configuration of the device and cannot be easily measured. . Further, since the device is complicated as described above, it is not possible to easily adjust the flow and direction of the jet flow jetted from the fluid jet nozzle on the loom, and it is possible to check and repair the nozzle and reed blades. There was a drawback that work efficiency was also poor.

The present invention has been made in view of the above-mentioned problems of the prior art, and is a fluid jet type capable of easily and reliably measuring the pressure, direction, etc. of a jet stream jetted from a fluid jet nozzle. An object of the present invention is to provide a jet flow measuring method and a jet flow measuring device in a loom.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a pressure-sensitive film that causes a physical change such as movement or breakage of particles or a change in optical performance by being subjected to a pressure is applied to a jet of a fluid jet nozzle. A jet flow measuring method in a fluid jet loom, which is disposed on a path and measures the state of the jet flow by visual change of the pressure sensitive film due to the pressure of the jet flow.

Further, according to the present invention, a pressure-sensitive film that undergoes a physical change upon receiving a pressure, and the pressure-sensitive film is detachably arranged at a predetermined position on the path of the jet flow jetted from the fluid jet nozzle. And a jet flow measuring device in a fluid jet loom including a member.

[0007]

The jet flow measuring method and the jet flow measuring device in the fluid jet loom of the present invention change the physical state of the pressure sensitive film by applying the jet flow jetted from the fluid jet nozzle to the pressure sensitive film. This change can be visually recognized, and the state of the jet flow can be directly measured by looking at the pressure sensitive film.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which the nozzle performance of a fluid jet nozzle 10 is measured. For example, the performance of a main nozzle and a sub nozzle of an air jet loom that jets air to send a weft yarn. It is to measure.
The fluid ejection nozzle 10 is attached to the nozzle support member 12 and is installed at a predetermined position on the measurement table 14. Measuring table 14
The film holding member 18 to which the pressure sensitive film 16 is fixed is provided on one side surface of the.

The pressure-sensitive film 16 uses, for example, a prescale (trade name) manufactured by Fuji Photo Film Co., Ltd., and a cross-shaped scale 20 is formed on the surface thereof. This pressure-sensitive film is one in which the density of the color changes depending on the pressure, and its mechanism is to use a film in which a microencapsulated color-developing agent is applied and a film in which a color-developing agent is applied in combination. When pressure is applied, the microcapsules are broken and the colorless dye is absorbed by the color developer to develop color. As another pressure-sensitive film, a surface film having a smooth surface and a receiving plate having a smooth surface are overlapped, and the film under the pressure and the receiving plate are in close contact with each other, and May have different reflectances, or may be a pressure sensitive film in which carbon of carbon paper is transferred to the mount by using a carbon paper and a mount.

In the jet flow measuring method of this embodiment, the fluid jet nozzle 10 to be measured is attached to the nozzle support member 12 and fixed at a predetermined position, and the fluid jet nozzle 10 is connected to a fluid pressure source (not shown) to supply fluid. To jet. At this time, the center of the scale 20 of the pressure-sensitive film 16 is located at the desired center of fluid ejection at the predetermined mounting position of the fluid ejection nozzle 10. Then, after ejecting the fluid toward the pressure sensitive film 16, the ejection of the fluid is stopped, and the color condition of the surface of the pressure sensitive film 16 is observed.

Generally, the performance evaluation of the fluid ejection nozzle 10 is performed by the ejection direction, the ejection pressure, and the degree of convergence of the ejection fluid, and any one of the evaluation items is out of the standard defined for each item. Is judged to be defective. The ejection direction is evaluated by determining how far the center of pressure of the ejected fluid deviates from a desired position when the fluid is ejected by directing the ejection hole of the fluid ejection nozzle 10 in a predetermined direction. Further, the evaluation of the jet pressure is performed by injecting the fluid into the fluid jet nozzle 10 at a predetermined pressure, and when the jetted fluid is vertically applied to the flat plate at a predetermined position, the maximum pressure or the average pressure on the flat plate. By. Furthermore, the degree of convergence is evaluated by whether or not the pressure range of a predetermined value or more is within a certain range in the pressure distribution of the injected fluid at a predetermined position.

For example, in FIG. 1, a portion in the upper left part of the drawing from the center of the scale 20 changes to a dark color,
The center of this thickened portion is the center of the pressure of the jetted fluid, and the jetting direction is determined by this, and the value of the pressure can be known from the depth of this color. Further, the degree of convergence of the ejected fluid is judged from the spread of the darkened portion of the pressure sensitive film 16. Therefore, in the fluid ejection nozzle 10 of FIG. 1, it can be seen that the center of pressure of the ejection fluid tends to be slightly deviated to the upper left of the drawing from the desired position.

According to the jet flow measuring method and the jet flow measuring device in the fluid jet loom of this embodiment, the fluid jet direction, jet pressure and convergence of the fluid jet nozzle 10 can be obtained without using a complicated pressure sensor system. It is easy to understand on the spot and the measurement work can be performed easily in a short time. Further, by forming the film holding member 18 of this embodiment so that it can be directly attached to the loom, it can be used for performance evaluation of the fluid injection nozzle attached to the loom and evaluation of jet flow characteristics.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described with reference to FIG. Here, the same members as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the pressure sensitive film 16 is arranged on a loom (not shown) so as to face the fluid ejection holes of the main nozzle 22 for weft insertion. The pressure sensitive film 16 has a film holding member 28.
The film holding member 28 is attached to the reed 30 of the loom, and the auxiliary nozzle 34 is attached to the film holding member 28.
A scale 36 for measuring the distance from is integrally provided. The pressure sensitive film 16 is arranged at a predetermined position of the guide groove 42 formed by the recess 40 of each reed blade 38 of the reed 30. In FIG. 2, the main nozzle 22 and the sub nozzle 2
4, the illustration of the support mechanism for the reed 34 is omitted.

In the method of using the jet flow measuring apparatus of this embodiment, the fluid jet directions of the main nozzle 22 and the sub nozzle 34 at the mounting position of the pressure sensitive film 16 are measured in the same manner as in the first embodiment, The nozzle mounting angle is adjusted, and the characteristics of the guide groove 42 provided on the reed 30 are measured. Main nozzle 22 and sub nozzle 3
For adjusting the mounting angle of No. 4, the pressure sensitive film 16 is arranged at a predetermined position from the tip of the nozzle with the scale 36, the center of the pressure of the jet flow is confirmed, and the angle is adjusted to an appropriate angle. In addition, the characteristic measurement of the guide groove 42 is performed by inserting the pressure sensitive film 16 between the reed blades 38 at appropriate intervals as shown in FIG.
The center of pressure and the degree of convergence of the jet flow within 2 are measured, and the dirt on the reed blades 38 is removed at the points having the above characteristics. In the case of this embodiment, even if the scale 20 is not formed on the pressure sensitive film 16, the position adjustment of the nozzles 22 and 34 and the guide groove 42 are performed from the relative position of the jet flow to the guide groove 42 at the mounting position. It is possible to measure the characteristics of.

According to the jet flow measuring method and the jet flow measuring apparatus in the fluid jet loom of this embodiment, the pressure sensitive film 16 can be used on the loom according to the shade of color without using a complicated system such as a pressure sensor. The state of the ejected fluid can be easily measured, and the mounting angles of the nozzles 22 and 34 can be adjusted and the characteristics of the reed 30 can be easily measured.

Next, a third embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. Here, the same members as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. In this example, the characteristics of the reed 30 are measured outside the loom.
Is vertically fixed to a groove portion of a holder 52 provided on a horizontal measurement table 50 by a holding portion 54 and a holding screw 56. A measurement nozzle 58 is provided diagonally forward of the guide groove 42 of the reed 30 in the same positional relationship as the sub-nozzle of the loom. The nozzle 58 is fixed to the moving table 62 via a mounting member 59. There is. In addition, the pressure sensitive film 1 inserted between the reed blades 38.
6 is fixed to a moving table 62 via a film holding member 60 and a position adjusting mechanism 61. Position adjustment mechanism 6
1 has an adjusting screw 63 for moving the film holding member 60 in the Y-axis direction in FIG. 4, and a drive motor 65 for the adjusting screw 63, and a feed nut 70 fixed to the film holding member 60 is screwed onto the position adjusting screw 63. is doing. In addition, the motor 6
5 is attached to a moving member 73, and is provided with an adjusting screw 67 for moving the film holding member 60 via the moving member 73 in the X-axis direction in the figure, and a drive motor 69 thereof.

The moving table 62 is provided on the guide rail 64 so as to be movable in parallel to face the reed 30, and the feed nut 70 fixed to the back surface of the moving table 62 and the feed nut. A feed screw 71 screwed to 70 and a motor 7 for rotating the feed screw 71.
2 is provided so that it can be moved to any position on the guide rail 64. The motors 65, 69, 72 are positioned at a plurality of predetermined positions by the feed control device 74. The motors 65 and 69 and the adjusting screw 63,
67 may not be provided, and instead of the motor 72, the moving table 62 may be manually moved.

In the method of using the jet flow measuring apparatus of this embodiment, the reed 30 is fixed to the holder 52, and first the motor 72 is used.
To move the moving table 62 to the measuring position,
The pressure sensitive film 16 is fixed to the film holding member 60 and inserted between the reed blades 38. The adjustment of the pressure sensitive film 16 in the XY axis directions is performed by operating the motors 65 and 69. After that, air is jetted from the nozzle 58, and the pressure sensitive film 1
The color center 6 is checked to measure the pressure center of the jet flow, the degree of convergence, the jet direction, etc., and the performance and characteristics of the reed 30 are evaluated.

According to the jet flow measuring method and the jet flow measuring device in the fluid jet loom of this embodiment, the characteristics of the reed 30 can be easily measured, and the measurement result can be immediately visually recognized. Therefore, the data of the quality judgment of the reed 30 can be quickly collected.

The pressure-sensitive film of the present invention is not limited to that of the above-mentioned embodiment, and may be any film that undergoes some physical change upon receiving fluid pressure so that it can be visually recognized. In addition, the color change of the pressure-sensitive film is converted into an electric signal by using a photoelectric conversion element such as an image sensor, and the electric signal is processed as it is or after data processing,
It may be displayed on the display or printed out. The fluid to be measured by the present invention includes both gas and liquid, and the present invention can be applied to both so-called water jet loom and air jet loom.

[0022]

According to the jet flow measuring method and the jet flow measuring device in the fluid jet loom of the present invention, the state of the jet fluid jetted from the nozzle can be visually and easily recognized, and The configuration can be simple.
Moreover, since the state of the fluid at that position appears immediately on the pressure-sensitive film itself, the measurement time does not need to be increased, and the adjustment of the nozzle position and the determination of the evaluation can be performed quickly.

[Brief description of drawings]

FIG. 1 is a perspective view of a jet flow measuring device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a jet flow measuring device according to a second embodiment of the present invention.

FIG. 3 is a front view showing a measurement state of the pressure-sensitive film of the second embodiment of the present invention.

FIG. 4 is a partially cutaway front view of the jet flow measuring device according to the third embodiment of the present invention.

FIG. 5 is a partially cutaway plan view of the jet flow measuring device according to the third embodiment of the present invention.

[Explanation of symbols]

 10 Nozzle 16 Pressure Sensitive Film 18 Film Holding Member

Claims (2)

[Claims] 1. A pressure-sensitive film that undergoes a physical change when subjected to a pressure is disposed on a path of a jet flow jetted from a fluid jet nozzle, and the physical change of the pressure-sensitive film due to the pressure of the jet flow is visually recognized. A jet flow measuring method in a fluid jet loom, characterized in that the state of the jet flow is measured by grasping the jet flow. 2. A pressure-sensitive film that undergoes a physical change when subjected to pressure, and a holding member that detachably arranges the pressure-sensitive film at a predetermined position on the path of a jet flow jetted from a fluid jet nozzle. A jet flow measuring device for a fluid jet loom, which is provided.