JPS5846151A - Wefting 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] The present invention relates to a weft insertion device for an air-jet loom.

As a weft insertion device of a conventional air injection loom, for example, the first
There is something like the one shown in the figure. That is, the guide elements 1 are arranged with a predetermined gap in the weft insertion direction, and the guide holes 2 form a guide passage for the weft conveying air, and guide the weft together with the air jetted from the main nozzle 3. Air is ejected diagonally into the guide passage from auxiliary nozzles 4 arranged at appropriate intervals on one side, thereby assisting the weft conveying airflow from the main nozzle 3 in the guide passage or transporting the weft from the main nozzle 3. After the conveyance of the material, weft insertion is performed.

However, since the ejection direction line of the auxiliary nozzle 4 is oblique to the axis of the guide passage, the weft conveying airflow winds in the guide passage, and the weft also meanders, so the guide hole of the guide element 1 In some cases, the weft ends would jump out from the weft escape volume II (not shown) that is connected to the second weft. Moreover, it is quite difficult to make the oblique lines accurately.
As it shifts, the weft transport airflow is further tightened,
This was a contributing factor to the frequent occurrence of infidelity.

Also, lf! i Kaisho 5! As shown in Japanese Patent No. S-84436, there is also one in which an auxiliary nozzle is inserted into the vicinity of the axis of the guide hole immediately after the tip of the weft has passed, so that air is ejected in the same direction as the weft insertion direction. However, the setting of the timing for moving the auxiliary nozzle was complicated, and there was also a concern that the weft yarn could get caught in the auxiliary nozzle due to variations in the passing time of the weft yarn.

SUMMARY OF THE INVENTION In view of these circumstances, the present invention aims to provide a weft inserting device that can prevent weft threads from getting caught in the auxiliary nozzle and allow the weft threads to fly stably without meandering. A part of the inner wall of the guide hole of the section guide is extended inward, and the overhangs are lined up in the weft insertion direction and gradually become larger, and an auxiliary nozzle is provided in the part that is in the shadow of the largest overhang. The air is ejected in substantially the same direction as the weft insertion direction.

Hereinafter, the present invention will be explained based on the drawings.

FIGS. 2 and 3 show an embodiment of the present invention.

Guide pieces 11-1 for each predetermined section arranged in the weft insertion direction.
11-2. ...11-N each guide hole 12 inner wall has an overhanging portion 13-1.13-2°...1 at the same location in the central direction.
3-N is formed, and these overhanging parts 13-1°13-
2, . . . 13-N are formed in each section so as to be lined up in the weft insertion direction and protrude gradually. Also,
Each overhang 13-1.13-2. . . . 13-N are also similarly tapered. 14 is a weft escape gap. .

Then, the guide element 1 having the largest overhang portion 13-N
An auxiliary nozzle 15 is provided between the guide element 1-N and the next guide element 11-1, so that the auxiliary nozzle 15 is hidden behind the overhanging portion 13-N when viewed from the weft insertion side. The auxiliary nozzle 15 has a spout 15m formed on the side wall opposite to the weft insertion side, and this spout 15a faces the guide hole 12 and is oriented in the weft insertion direction.

According to this configuration, air from the auxiliary nozzle 15 is ejected in the weft insertion direction parallel to the axis of the guide passage formed by the 120 rows of guide holes, thereby assisting or generating the weft conveying airflow. Therefore, meandering of the weft yarn conveying airflow is extremely rare, the meandering phenomenon of the weft yarn during flight is also drastically reduced, the weft yarn can fly stably, and weft insertion can be stabilized.

In addition, a large overhang 1 is provided on the weft insertion side of the auxiliary nozzle 15.
3-N, which hides the auxiliary nozzle 15, so that the flying weft yarn will not be caught by the auxiliary nozzle 15. Moreover, a series of overhangs 13-1 to 13
-N gradually increases with an appropriate inclination toward the weft insertion direction, so the weft conveying airflow and the weft are guided along the inclination, suppressing turbulence in the weft conveying airflow, and allowing the weft to pass through the overhanging portion 13- 1 to 13-N.

In this embodiment, although the guide hole 120 has a circular basic shape, it is also applicable to a rectangular guide hole. Further, the inner surface of the guide hole 12 may be straight or tapered.

Moreover, as shown in FIG.
3-2, . . . 13-N without arranging them on the color surface.
) by protruding inward from the front edge of the slope of the overhang (13-2) (see d in the figure), the air for weft conveyance is transferred to the guide (for example, 1l-2). The weft conveying air may be guided more smoothly by preventing the hook from protruding into the peripheral edge of the guide hole in 2). In this case, it is more effective to round the front edge of the inclined surface.

FIG. 5 shows another embodiment.

In this embodiment, the guide element 11-1 before and after the auxiliary nozzle 150
~11-N group, their overhangs 13-1 to 13
-N formation positions are alternately shifted. Of course, the position of the ejection port 15m of the auxiliary nozzle 15 is also shifted. In this way, the air ejected from the auxiliary nozzle 15 is located on the side opposite to the weft insertion side of the overhanging portions 13-1 to 13-13 which gradually become larger.
-N is less likely to disperse due to the influence of the In reality, a small angle shift is sufficient.

In the above embodiments, a pipe-shaped auxiliary nozzle separate from the guide was used, but the invention is not limited to this. For example, the interior of the guide having the largest overhang is made hollow to form an air passage. However, if the jetting port is formed on the surface of the overhanging portion opposite to the cotton inserting side, the turbulence of the airflow can be further suppressed. 'In addition, air injection looms equipped with such auxiliary nozzles have a method in which the weft conveying airflow from the main nozzle is boosted by air ejected from the auxiliary nozzle, as well as a method for inserting the weft.
It is also applicable to a method in which the air ejected from the main nozzle is stopped once to the extent that the weft is pulled, and the air ejected from the auxiliary nozzle is used to transport the weft sequentially and insert the weft. It can also be applied to the case where the main nozzle is used to convey the material halfway and then the auxiliary nozzle is used to convey it from the middle, in which case K.

The present invention is applied to the auxiliary nozzle located in the transfer area from the main nozzle to the auxiliary nozzle, and air is ejected in the weft insertion direction as described above. Air may also be blown out.

As explained above, according to the present invention, a portion of the inner wall of the guide hole of the guide group on the weft insertion side of the auxiliary nozzle is formed with a protruding portion that gradually increases in size in line with the weft insertion direction, so that the auxiliary nozzle Since it is hidden behind the large overhang, air can be ejected from the auxiliary nozzle in the same direction as the weft insertion direction, which prevents the weft from meandering, greatly improving weft insertion performance. The weft yarn is no longer caught in the auxiliary nozzle. Furthermore, the weft conveyance efficiency is improved, air consumption can be reduced, and there is also an energy saving effect.

[Brief explanation of the drawing]

FIG. 1 is a plan cross-sectional view showing a conventional example of a weft insertion device for an air injection loom, FIG. 2 is a front longitudinal cross-sectional view showing an embodiment of the present invention (1-1 sectional view in FIG. 3), 3 is a left side view of each guide in FIG. 2, FIG. 4 is a front vertical sectional view showing a modification of the same embodiment, and FIG. 5 is a front vertical sectional view showing another embodiment. 11-1 to 11-N... Guide element 12... Guide hole 13-1 to 13-N... Overhang portion IS... Auxiliary nozzle patent applicant Nissan Motor Co., Ltd. agent Patent attorney Fujio Sasashima

Claims (1)

[Claims] A guide (11) having a guide hole (12) for air for weft conveyance.
) are arranged in parallel in the weft insertion direction for an air-injection loom.
A part of the inner wall of the guide hole (12) of group N) is formed to project inwardly, and the projecting portions (13-1 to 13-N) are arranged in the weft insertion direction and gradually become larger. 1! An auxiliary nozzle (15) that blows out air in the weft insertion direction is provided on the opposite side of the weft insertion side of the largest overhang (13-N). ! Weft inserting device for air injection loom with 1ilk.