JPH03167345A - Reed for air jet loom - Google Patents

Abstract

PURPOSE:To obtain the subject capable of exhibiting excellent picking stability and function to reduce compressed air consumption by setting air current convergent angles of an upper jaw part and lower jaw forming a guide groove of each dent within a specific range and providing a compressed air diffusion angle in the depth. CONSTITUTION:An upper jaw part (A) and a lower jaw part (B) forming a guide groove (G) of each dent 1 in a deformed reed for an air jet loom of the type using auxiliary nozzles in combination are provided with conditions in which respective air current convergent angles (thetaA) and (thetaB) satisfy formulas thetaA>=0 deg., 5 deg.<=thetaB<=30 deg. and thetaA<thetaB to increase air currents flowing from the upper to the lower parts in the reed grooves (G). Thereby, the quantity of compressed air is reduced. Furthermore, a compressed air diffusion angle (thetaC) is provided in the depth (C) to produce air currents escaping to the back side of the reed. As a result, high-flow velocity parts in the reed grooves (G) move to the depth (C) of the reed to eliminate jumping out of the weft yarn from the interior of the reed grooves (G).

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a modified reed used in an air jet loom combined with an auxiliary nozzle, and more specifically, to improving weft insertion stability at high speeds and reducing pressurized air consumption. This invention relates to a modified reed with functions.

[Conventional technology]

The deformed reed according to the present invention is a reed in which a reed blade L having a groove G formed by an upper jaw part A, a lower jaw part B, and a back part C shown in the first circle is rotated in the longitudinal direction of the reed as shown in FIG. They are arranged in parallel with the same pitch and height. Further, a plurality of auxiliary nozzles 2 are arranged at arbitrary distances in the front longitudinal direction of the lower jaw portion B of this reed.

Conventionally, most of the loom rotational speeds of air jet looms using an auxiliary nozzle have been in the range of 500 to 600 rpm, but recently even higher speed types have been developed and put into practical use. However, since the air jet loom consumes a lot of energy, as the speed of the loom increases, the amount of pressure air consumed per liter increases, and the weft flight properties also become unstable. However, the reality is that this is not reflected in the expected rationalization of costs. Generally, in the reed, as shown in Figure 3, the sub nozzle 2
The pressurized airflow injected from the reed reeds includes an airflow g flowing in the weft flight direction in the guide groove, an airflow r rebounding to the front surface of the reed reed 1, and an airflow a and b flowing upward and downward from between the rows of reed reeds l. The airflow separates into C, which flows from between the rows of feathers 1 to the back of the reed. here,
When the nozzle injection pressure is increased in order to increase the rotational speed of the loom, the airflow f that bounces back to the front surface of the reed blades increases. Therefore, in the distribution of air flow velocity, the high-speed flow area moves further toward the front of the reed blades, and the weft yarns tend to jump out from within the reed grooves G, making weft insertion unstable.

Japanese Unexamined Patent Publication No. 1-266243 describes the upper jaw part of the reed feather,
A reed wing is disclosed in which the lower jaw part has an angle that has a pressure air focusing effect, and the back part of the reed wing has an angle that has a pressure air diffusion effect. However, the reed feathers disclosed in the above publication are... There is no particular description of the relationship between the angles of the lower jaw and lower jaw.
In particular, the angle of the lower jaw part does not matter whether it is angled or not, and the operability of the loom at high speeds is still low.

[Problems to be solved by the invention] The conventionally known modified reed of the air jet loom combined with an auxiliary nozzle solves multiple problems such as providing excellent weft insertion stability even at high speeds and providing a function to reduce pressurized air consumption. Can not.

[Means to solve the problem]

As a result of extensive research into the above-mentioned modified reed, the present inventors found that a modified reed in which the airflow convergence angle of the upper and lower jaws is set within a certain range provides unprecedented weft insertion stability and reduces pressure air consumption. The present invention was based on this finding.

That is, the present invention provides a modified reed for an air jet loom combined with an auxiliary nozzle, in which an airflow convergence angle θ. , θ, are provided respectively, an airflow spreading angle θ, is provided in the inner part, and the airflow convergence angle θ. ．． θ． This is a reed for an air jet room, characterized in that it satisfies the following formulas (1) to (3).

0°≦θA (1) 5°≦θ. ≦30° (2) θ. <θ. (3) The present invention will be described in detail below with reference to figures showing an example of the air jet loom reed of the present invention. Fig. 4 shows an enlarged view of the groove G of an example of the reed blade for controlling the air jet loom reed of the present invention. The reed feather 1 has a groove part G surrounded by an upper jaw part A, a lower jaw part B, and a back part C. The airflow convergence angles θA and θB provided at the upper jaw portion and the lower jaw portion in the present invention are defined as the airflow convergence angles θA and θB provided at the upper jaw portion with respect to the weft flight direction when the I-1′ cross section of the reed blade 1 is viewed from the reed beating direction. A,
This is the angle of inclination of the full surface of the lower jaw part B, and as shown in FIG. 5(a), the groove part is narrowed with respect to the pressure air injection direction,
This angle has the effect of focusing the airflow g flowing inside the reed. In addition, the airflow diffusion angle θC provided at the inner part C in the present invention is the inclination angle of the full surface of the inner part C with respect to the weft flight direction when the nn' cross section of the reed blade 1 is viewed from the reed bottom surface. As shown in Figure 5 (b), the groove is widened in the direction of the pressure air injection, and this angle has the effect of diffusing the airflow g flowing inside the reed. However, the above θ. ．． θ1, θ is the sixth
As shown in the figure, it can be set even in the case of a rounded reed with a part of the taber j. The airflow convergence angles θA and θB of the upper and lower jaws of the air jet loom reed of the present invention are 0°≦θ. ,5゛≦θ,
≦30°, θ. It is necessary to satisfy θ8.

If θ4 is smaller than O゛, the air flow focusing effect cannot be obtained, so it is not preferable, and from the point of view of pressure reduction, it is preferable that 04 is 0°. θ． If the angle is less than 5°, a sufficient air velocity effect cannot be obtained, whereas if it exceeds 30°, the weft and warp threads will be damaged during weaving, causing fuzzing and cutting, which is not preferable.

Although the size of the airflow diffusion angle C provided in the inner part C is not particularly limited, it is preferably 2° to 30° from the viewpoint of the effect of flowing the airflow to the back surface of the reed.

In this way, the pressure air convergence angle θ of a predetermined size is set at the upper jaw portion and the lower jaw portion. , θ1, it is possible to increase the airflow flowing from the bottom to the top within the reed groove, and it is possible to reduce the amount of air pressure.

In addition, by giving a pressure diffusion angle θ to the deep part,
A pressurized air flow C is generated that escapes to the back side of the reed, and as a result, the high-speed flow part inside the reed groove moves toward the inner part C of the reed, and the G inside the reed groove moves.
This eliminates the problem of the weft yarn popping out from the weft and provides stable weft insertion.

In addition, as shown in Fig. 7, the proportion L of the straight part of the taber in the cross section of the reed blade is calculated by the following formula.The larger L is, the greater the effect of the present invention is. This increases the amount of straining of the warp threads, leading to problems such as glue falling off and warp thread breakage, so optimal conditions are required depending on the type of fabric.

L (%) = 1' / lxl00 l: Length of the tapered part of the reed feathers l': Length of the straight part of the tapered part of the reed feathers The preferred range of L is 50 to 90%. Note that the shapes of the plurality of reed blades that control the reed may all be the same, or the shape of the groove portion may be appropriately changed depending on the distance from the main nozzle or the auxiliary nozzle.

〔Example〕

Examples 1-7. Comparative Examples 1 to 7 Airflow convergence angle θ at the upper jaw. are O° and 6°, and for each θ, the airflow convergence angle θ. O゜～40
Examples 1 to 7 and Comparative Examples 1 to 7 were selected from the following ranges and subjected to weaving evaluation. Note that the airflow diffusion angle θ at the back was kept constant at 5°. The results are shown in Table 1. 1st
The table shows the average number of weft stoppages per day and the number of loom rotations when the loom was operated continuously for 3 days at a rotation speed of 800 rpm.
It shows the rate of increase in pressure air consumption when increasing from pm to 80 rpm.

Good weaving performance, average number of machine stops within 5, pressure increase 50%
Considering the above, weaving properties were good in all cases of weaving using the reed for air jet loom of the present invention.

Table 1 below (margin) [Effects of the Invention] Since the air jet loom reed of the present invention is constructed as described above, it can achieve the effects of reducing pressurized air consumption and stabilizing weft insertion at the same time. By using a reed with such functions, no matter the rotation speed,
It has the effect of reducing air pressure, provides a stable supply of weft yarn, and has excellent economical effects.

[Brief Description of the Drawings] Figure 1 is a diagram showing the names of the various parts that make up the modified reed and the auxiliary nozzles. FIG. 2 is a horizontal sectional view of a modified reed made of reed blades and a diagram showing the arrangement of auxiliary nozzles. FIG. 3 is a side view of the reed blade showing the dispersion of the airflow injected from the auxiliary nozzle. Figure 4 is an enlarged view of the groove of the reed feather that makes the reed of the present invention the most powerful. Figures 5(a)lm and 50) are cross-sectional views of the reed blades for explaining the width and narrowness of the grooves of the reed blades. Figure 6 shows the airflow convergence angle and airflow diffusion angle set in the round reed blades of a part of Taber. Figure 7 shows the straight part of the reed taper. l...
・Reed feather, 2... Auxiliary nozzle, A... Upper jaw part, B.
...Lower jaw part, C...back part, G...groove part, θ.・・・
・Airflow convergence angle at the upper jaw, θ8...Airflow convergence angle at the lower jaw, θゎ...Airflow diffusion angle at the back, θ...Airflow convergence angle or airflow diffusion angle, a...Reed Airflow flowing upward from between the rows of reed feathers 1, B... Airflow flowing downward from between the rows of reed feathers 1, C... Airflow flowing from between the rows of reed feathers 1 to the back of the reed, ...Airflow bouncing back to the front of reed feather 1, g...
・Airflow flowing inside the reed, h...Weft flight direction, j...
Pressure air injection direction, j... Part of the reed blade.

Claims (1)

[Claims] In a modified reed for air jet loom combined with an auxiliary nozzle, airflow convergence angles θ_A and θ_B are provided in the upper and lower jaw parts, respectively, which form the guide grooves of the reed blades, and the airflow is A diffusion angle θ_C is provided, and the airflow convergence angles θ_A, θ_
A reed for an air jet room, characterized in that B satisfies the following formulas (1) to (3). 0°≦θ_A (1) 5°≦θ_B≦30° (2) θ_A<θ_B (3)