JPS61289151A - Air guide apparatus of air jet type loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an air guide device for an air injection type loom, and more specifically, an air guide groove is formed by a row of recesses formed in the front surface of each reed blade, and The present invention relates to an air guide device that injects air for weft insertion into the air guide groove from an auxiliary nozzle arranged in front of the guide groove, and guides the injected air flow toward a side opposite to the main nozzle while reflecting it by the inner surface of the recess.

(Prior Art) FIGS. 1 and 2 are explanatory diagrams of main parts of an air guiding device to which the present invention is directed.

In the figure, 1 is a reed, and 2 and 3 are a reed frame and a reed feather, respectively. The front side of each reed feather 3 (the side of Orimae F side)
protrudes into a chevron shape and has a recess 4 formed at its top,
Air guide grooves 6 are formed in the reed row by the rows of these recesses.

T is a reed holder that holds the reed 1 fixedly and is attached to the sled 8. A main nozzle 9 is fixed to one side (weft entry side) of the reed holder T and is open toward the air guide groove 6.

Reference numeral 10 denotes a plurality of auxiliary nozzles, which are arranged at a predetermined pitch in front of the air guide groove 6. These auxiliary nozzles are usually divided into groups of several.

In the above device, when the weft insertion period arrives, the air is injected from the main nozzle 9 (therefore, the weft yarn is injected into the air guide groove 6), and then from the group of auxiliary nozzles closest to the main nozzle 9 to the diagonally upward direction opposite to the main nozzle. Air is injected towards. Part of this injected air flow J successively escapes behind the three rows of reed blades, and the remaining part is reflected from the inner surface of the recess 4, especially the bottom surface 5, and reflects the above-mentioned escape. Drawn by the airflow, it is guided toward the side opposite to the main nozzle while creating a relatively stable basin near the bottom of the air guide groove 6.Then, the leading portion of the ejected weft yarn is carried by this airflow. When the leading part of the weft yarn reaches the next auxiliary nozzle group, air is ejected from that group, and this operation is sequentially inherited by the next group to insert the weft yarn. .

Here, the technique disclosed in Japanese Patent Application Laid-Open No. 56-20642 is that in the latter half weft entry region where the jet airflow from the main nozzle 9 is attenuated, the jet from the auxiliary nozzles arranged in the region is In order to increase the airflow, the air pressure (original pressure) supplied to these auxiliary nozzles is increased or the nozzle diameter is expanded. As a result of this K, the weft conveying force in the latter half region increases, and as a result, the weft is pulled and expanded from its front part, and weft insertion can be completed in such a good state.

(Problems to be Solved by the Present Invention) However, the technique disclosed in the above-mentioned publication has a problem in that it takes time and effort to prepare and adjust the loom.

This is because various requirements such as the force and direction of the jet airflow of the auxiliary nozzle, or the position and pitch of the jet nozzle are adjusted relative to each other according to the weaving conditions. This is because when using auxiliary nozzles with different specifications such as pressure and source pressure, adjustment is required for each region and between regions.

Therefore, the problem of the present invention is to match the specifications of the auxiliary nozzles and to augment the force of the airflow in the weft insertion region far from the main nozzle.

(Means of the present invention) The means of the present invention that solves the above problem is such that, at least on the bottom surface of the inner surface of the recess, the directivity toward the air guide groove is reduced in the recess closer to the main nozzle. , which is enlarged in the same farthest recess.

(Function) As described above, when the jet airflow from the auxiliary nozzle is guided while being reflected from the inner surface of the recess, especially the bottom surface, the greater the tendency of the inner surface to direct toward the air guide groove, the greater the reflectance.
This decreases the above-mentioned escape airflow. Therefore, according to the means of the present invention, a larger flow rate of the jet air flow in the air guide groove is ensured on the side far from the main nozzle.
The weft conveying force on the anti-weft entry side can be increased in the same way as in the conventional case where the nozzle diameter is enlarged.

(Embodiment) FIGS. 3 and 4 are diagrams showing an embodiment of the present invention.

In this embodiment, the reed blade row of the reed 1 is first divided into four sections A to D from the main nozzle 9 side as shown in FIG. They are formed as shown in 5a to 5d shown in FIG. These bottom surfaces 5a to 5d are sketched by enlarging them using a cross-sectional projector after being formed by a method described later, and the left side of the figure is the main nozzle side.

In these bottom surfaces, the bottom surface 5a has a curved surface with a radius of curvature Ra on the main nozzle side, and a curved surface that is almost symmetrical to the above curved surface on the opposite side of the main nozzle, and the bottom surface 5a has an almost weft-shaped surface as a whole as shown by the arrow Xa. oriented in a direction. Therefore, the outer edge of the jet airflow is guided by the curved surface and escapes while going around behind the reed blades 3a, as shown by the broken line. On the bottom surface 5b, a curved surface having a radius of curvature Rb larger than the radius of curvature Ra is formed toward the main nozzle side and tends toward the air guide groove 6 as shown by the arrow. When the curved surface closer to the main nozzle is on the bottom surface 5C, its directional line Xc has a larger radius of curvature Rσ and is further inclined toward the air guide groove 6 side, and the bottom surface 5
At point d, the radius of curvature Rd of the curved surface is larger and its directional line X
The tendency of d to be directed toward the air guide groove 6 side is further strengthened.

Therefore, as shown by the broken line, the bottom surface is 5 m + 5 b
The escape airflow decreases in the order of +5c and 5d, and the air guide groove 6
The reflected component increases.

Next, an example of a method for forming the bottom surfaces 5a to 5d will be described.

First, the general manufacturing procedure for the reed 1 is to first punch out the reed blades 31 from a sheet metal, then perform barrel processing and cut out the periphery, and then arrange and fix them on the punching frame 2. Next, as shown in FIG. 5, the inner surfaces of the four rows of recesses are ground with a grindstone 15 to correct irregularities, and then, as shown in FIG. 6, the ground inner surfaces are polished using a puff foil 16.

Here, in order to form the bottom surfaces 5a to 5d, first, the outer periphery of the puff foil 16 advances from the main nozzle 9 side of the 5 rows of the bottom surface and retreats to the opposite side, as shown by the arrow Rv. Determine the direction of rotation of the puff foil and add $100 to it.
Apply about 0 compound. Then, the puff foil 16 is reciprocated about 10 times over the entire area A-D. Next, similar reciprocating operation is performed for section B-D.
Next, let's look at CD and finally the section.

In the above process a, the bottom of each recess is made of puff foil 16t.
Since the l-main nozzle 9 side is picked up, the line side is polished more than the opposite side, and the amount of polishing is accumulated in the order of sections A, B, C, and D according to the number of reciprocations of the puff foil. Therefore, the tendency of the bottom surface 5 toward the air guide groove 6 increases in the order of 5a, 5b, 5c and 5d as shown in FIG.

It should be noted that a larger curved surface is formed on the side opposite to the main nozzle on the bottom surface 5a, but this is thought to be due to the influence of the punching slope when punching the reed blades.

FIG. 7 is a graph showing the results of an effect confirmation test performed on the reed feather array of FIG. 4 produced as described above, and FIGS. 8 and 9 are explanatory diagrams of the testing apparatus.

In FIGS. 8 and 9, 1 is the reed fixed to the test stand, and 10 is the auxiliary nozzle fixed to the test stand at a position in practical relation to the reed 1.

Further, 20 is a carrier, 21 and 22 are a pitot tube and a pressure cartridge carried by this carrier, 23 is a recording device, the carrier 20 is engaged with the upper frame of the extraction frame 2 and is movable, and the pitot tube 21 is The air guide groove 6 is opened near the bottom toward the upstream side (main nozzle 9 side) K of the jet air flow J. The pressure sensor 22 converts the flow velocity (pressure) detected by the Pitot tube 21 into an electrical quantity signal, and the recording device 23 inputs this electrical quantity signal to create the graph shown in FIG. 7.

The test conditions are as follows.

Dimensions of the reed: (See Figures 4 and 9 for symbols) Width (=height behind recess 4) H...4m Thickness T
...0.231111 Gap between reed wings ...0.4■Width W of recess 4
...Depth of 6th recess 4 D ・
...9■ Radius of curvature of bottom surface 5a to 5d Ra = 0.19 ws, Rb ...0.2
3 wsRe = 0.25 a, Rd river 0
．． 44 M auxiliary nozzle arrangement pitch P (Fig. 8) ...75m injection diameter
...1.4m source pressure
...3kf/CI! t↑Driving speed of 20
...15-/eC Flow velocity detection frequency ...every 25 Illllll. Flow velocity (head pressure) when running from the side (not
The distribution is recorded, and each time the opening of the pitot tube 21 enters the jet area of the jet air flow J, the water head pressure rises in a sharp mountain shape.

Therefore, the water head pressure between these peaks clearly indicates the amount of reflected air from the bottom surfaces 5a to 5d of the recess, and the water head pressure increases as the pressure moves from button section A to button section D, as shown by the curved line. It is rising.

Of course, the form of this curve can be changed by appropriately selecting the number of sections, the manner in which the direction line changes between each bottom surface, etc. By providing the above-mentioned difference in directivity, it is possible to bring about a more significant change in reflectance.

(Effects) As explained above, according to the present invention, when increasing the airflow on the opposite side of weft entry, the function can be left to the function of the reed itself, making it extremely easy to prepare and adjust the loom. Make it familiar.

[Brief explanation of drawings]

Fig. 1 is a front view of the main parts of an air guiding device to which the present invention is applied, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view showing an embodiment of the present invention. An overall front view of the reed, FIG. 4 is an enlarged sectional view of the main part taken along line IV-ff in FIG. 3, FIGS. 5 and 6 are explanatory diagrams illustrating the manufacturing method of the present invention, and FIG. FIG. 8 is an explanatory diagram of the test device, and FIG. 9 is an enlarged view taken along line IX-IX in FIG. 8. 1... Reed 3 (3a to 3d)... Reed wing 4... Recess 5 (・5a to 5 d) Door... Bottom of recess 6... Air guide groove 10... Auxiliary nozzle

Claims (1)

[Claims] An air guide groove is formed by a row of recesses formed on the front surface of each reed, and air for weft insertion is injected into the air guide groove from auxiliary nozzles arranged in front of the air guide groove. In an air guide device that guides the airflow toward the side opposite to the main nozzle while reflecting the airflow by the inner surface of the recess, at least the bottom surface of the inner surface of the recess has a direction toward the air guide groove close to the main nozzle. An air guide device for an air-jet loom, which is smaller in one recess and larger in the other recess.