JPS6261696B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft guide in a fluid jet loom.

First, the outline of the fluid jet loom is shown in Figures 1 and 2.
This will be explained according to the diagram.

Reference numeral 1 denotes a slay fixed to a slace word 2 that rotates back and forth in the direction of the arrow by a drive mechanism (not shown). A reed 3 and a guide 4 are arranged on the sleigh 1. The thread of the cheese 5 fixedly provided on the side of the machine is let out by long side rollers 6 and 7, is temporarily stored in a storage device 8, passes through a braking device 9, and reaches the main nozzle 10. . At the same time as the fluid is injected from the main nozzle 10, the yarn is also flown as a weft, and the weft Y is guided by the guide 4 and inserted into the weft. When weft insertion is completed,
The sley 1 is continuously rotated in the direction of the arrow from the weft insertion state, the guide 4 is separated from the warp W as shown by the imaginary line in FIG. It is formed.

Conventionally, the weft Y guided by the guide 4
The flying force is maintained by the auxiliary airflow that is injected along the guide direction by the guide 4 during flight, and the flying force is maintained. The main air flow is directed far away along the flow (for example, the injection angle formed by the injection direction center line of the auxiliary air flow is about 5 to 6 degrees with respect to the injection direction center line of the main air flow). It was considered desirable to not disturb the environment.

However, in reality, as shown in FIG. 6, near the auxiliary air flow injection position, a significant flow velocity asymmetric region A occurs due to the merging of the main air flow and the auxiliary air flow. In this state, in addition to the central part A of the flow velocity asymmetric region A, a part B with a high flow velocity is generated around it, and the weft yarn Y is drawn into that part B, making the flying path unstable, and the weft yarn Y is moved to the guide 4. This may cause the weft Y to jump out, cause the weft Y to wave, or even result in a weft insertion error, which subtly affects the texture of the fabric. In order to prevent this phenomenon, it is necessary to form a flow velocity distribution in which the flow velocity is concentrated as much as possible in the center part A of the main air flow where the weft yarn Y is carried near the injection position of the auxiliary air flow, and It is most desirable that portions B other than A where the flow velocity is high are quickly concentrated in the central portion A to form a stable laminar flow region B. However, the flow velocity asymmetric region A is
If the injection angle of the auxiliary fluid is small (about 5 to 6 degrees as mentioned above), it will continue indefinitely, and it will take more distance and time than necessary to reach the laminar flow region, which will hinder the flight stability of the weft yarn Y. Ta.

This invention sets the injection angle of the auxiliary airflow to the main airflow in the range of 10 to 30 degrees (most preferably about 15 degrees), and sets the minimum inner diameter of the guide to the minimum inner diameter of the active guide that ejects the auxiliary airflow. By forming the inner circumferential surface of the guide substantially parallel to the outer circumferential surface of the auxiliary air bundle injected from the active guide, a stable laminar flow region is quickly formed (i.e., the flow velocity asymmetric region is reduced). We have succeeded in reducing this as much as possible.

An embodiment of the present invention will be described below with reference to the drawings, but since the loom to which this invention is applied is the same as that shown in FIGS. 1 and 2 above, only the configuration of the guide 4 will be described below. Add.

Now, as shown in FIGS. 4 and 5, the guide 4 consists of an arm portion 4a extending straight upward and an annular portion 4b formed at the upper end of the arm portion 4a. These guides 4 are of a tunnel type (closed type) in which an opening 12 is provided at the upper part of the annular portion 4b on the warp W advancing side. This opening 12 is connected to the weft Y and the annular portion 4 of the guide 4 during beating.
This is to escape from b. 4A is an air injection port 1 to be described later on one side of the numerous guides 4.
3, the plurality of active guides forming a
They are arranged in a straight line with ordinary guides 4 having no air injection ports 13 at predetermined intervals.

As shown in FIG. 3, an air passage 14 is formed in the annular part 4b and the inner peripheral edge of the active guide 4A having the air injection port 13, and in the arm part 4a. Weft Y
It opens on the inside of the traveling side. The air injection port 1 has a plurality of slit-like openings.
3, and each of the injection ports 13 has an arc shape, and the whole has an annular shape.

The active guide 4A having the air injection port 13 is formed by dividing it into two in the thickness direction. That is, this active guide 4A
The main body portion 15 constitutes a side wall opposite to the opening side of the air injection port 13, and the cover portion 16 constitutes a side wall on the side of the air injection port 13. and,
Concave portions 17 extending vertically are formed in corresponding positions of the body portion 15 and the cover portion 16, and the space between the two concave portions 17 serves as the air passage 14, and the seam 18 between the body portion 15 and the cover portion 16 serves as the air passage 14.
The plurality of air injection ports 13 are formed between the inner peripheral edges of the ring portions 15a and 16a of both of the ring portions 15 and 16.

Now, in this invention, the injection of the auxiliary nozzle 19 is formed by the center line C of the auxiliary air flow injection direction from the auxiliary nozzle 19 of the active guide 4A configured as described above and the main air flow injection center line D of the main nozzle 10. It is most desirable to set the angle θ to about 15 degrees, but 10
If the angle is within the range of ~30 degrees, flight stability of the weft Y, which is the object of the present invention, can be achieved.

That is, when the injection angle θ is reduced to about 5 to 6 degrees as in the conventional case, the main nozzle 10 Since the intersection point E of the main airflow injection direction center line D and the injection direction centerline D of the auxiliary nozzle 19 is further away from the injection position of the auxiliary nozzle 19, the flow velocity distribution formed by the main airflow of the main nozzle 10 is A portion B where the flow velocity is high due to the auxiliary air flow from the auxiliary nozzle 19 tends to remain around the center portion A for a long time, and the flow velocity asymmetric region A shown in FIG. 6 continues indefinitely. However, as shown in FIG. 7, in this invention, since the injection angle θ is large to some extent, the intersection point E is located closer than before, and the auxiliary nozzle 1
Even in the vicinity of the injection by 9, the central part A of the main air flow
The auxiliary air flow joins the main air flow more easily, and the flux distribution of the main air flow near this injection area is less turbulent compared to the conventional example. , and form a stable laminar flow region B.

However, if the injection angle θ is less than 10 degrees, there will be a lot of waving as in the conventional example, making the flight of the weft unstable and causing it to fly out, and if it exceeds 30 degrees, the component orthogonal to the flight path will be too large, causing the same problem in flying. The track becomes unstable. Therefore, it is necessary to set the injection angle θ of the auxiliary air flow from the auxiliary nozzle 19 with respect to the main air flow from the main nozzle 10 to 10 degrees or more and 30 degrees or less.

In addition, as shown in Fig. 3, the initial velocity of the jet from the auxiliary nozzle 19 is 200 m/sec, the diffusion angle α of the auxiliary air flow is generally confirmed to be about 20 degrees, and the outer circumference of the conical air bundle is approximately 20 degrees. The surface F and the tapered inner circumferential surface G of the guide 4 without the auxiliary nozzle 19 are set to be parallel to each other, and the minimum inner diameter point H of the inner circumferential surface of the guide 4A having the auxiliary nozzle 19 is A straight line J connecting an active guide 4A having an auxiliary nozzle 19 in the upstream side with the minimum inner diameter point I on the inner circumferential surface of a guide 4 without an auxiliary nozzle 19 located one downstream thereof is It is arranged to enter the opening 12 of the auxiliary nozzle 19 of the active guide 4A having the auxiliary nozzle 19 upstream. That is, the minimum inner diameter of the guide 4 is made larger than the minimum inner diameter of the active guide 4A. Therefore, active guide 4A
The auxiliary air flow ejected from the auxiliary nozzle 19 smoothly guides the diffused air flow toward the guide inner peripheral surface G side to the main air flow side without disturbing the air flow by the guide inner peripheral surface G, and the main air flow is Accelerates the concentration of flow to central area A.

As detailed above, according to the present invention, the auxiliary airflow that is injected from the active guide 4A at a predetermined angle to the center line in the injection direction of the main airflow is diffused, especially toward the inner circumferential surface G side of the guide. can be smoothly guided to the main air flow side by the guide inner circumferential surface G without disturbing the air flow, and the main air flow can be concentrated in the center part A more quickly, thereby maintaining the flight stability of the weft yarn. be effective.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing a loom embodying the present invention, Fig. 2 is a schematic plan view, Fig. 3 is a sectional view showing the arrangement of the guides, and Fig. 4 is a front view of the guide without auxiliary nozzles. Figure 5 is a front view of the active guide, Figure 6 is a flow velocity distribution diagram showing changes in the main air flow in the conventional weft guide, and Figure 7 is a flow velocity diagram showing changes in the main air flow in the weft guide of the present invention. It is a distribution map. Guide 4, active guide 4A, main nozzle 1
0, auxiliary nozzle 19, injection direction center lines C, D, injection angle θ.

Claims (1)

[Claims] 1. A guide for guiding the weft is formed by a large number of guides 4 and active guides 4A arranged between the guides 4 at predetermined intervals, and the main air flow injected from the main nozzle 10 and the active guide 4A are injected from the active guide 4A. In a fluid jet loom in which the weft is inserted while being guided in the guide by an auxiliary air flow, the minimum inner diameter of the guide 4 is formed larger than the minimum inner diameter of the active guide 4A, and the main air flow The injection angle formed by the injection direction center line of the active guide 4A and the injection direction center line of the auxiliary air flow is set in the range of 10 to 30 degrees, and the inner peripheral surface G of the guide 4 is connected to the auxiliary air injection direction from the active guide 4A. A weft guide for a fluid jet loom, characterized in that it is formed substantially parallel to an outer peripheral surface F of a bundle.