JPS602745A - Weft yarn inducing 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 an open type weft guiding device for an air-jet loom.

An open type weft guiding device consists of a plate-shaped inductor having concave notches arranged in the weft insertion direction, a guide groove formed by the row of the notches, and a main weft oriented in the weft insertion direction in the guide groove. Air is ejected from the nozzle and air is ejected from a plurality of sub-nozzles arranged to be oriented in the diagonal weft insertion direction to generate an airflow along the bottom of the guide hole, and this airflow guides the weft yarn and inserts the weft. An example of this is shown in FIGS. 1 and 2.

In the drawing, 1 is a reed, 2 is a liquid that also serves as the inductor, and 3 is a horizontal U formed on the front side (fabric front side) of the liquid.
The letter-shaped notches 4 are guide grooves formed by the rows of liquid 2 in the reed 1 (thus, 30 rows of notches). 5 is a main nozzle which is fixed to the slay 6 for attaching the reed 1, and whose jetting direction line M is arranged near the groove bottom 4a of the guide groove and directed in the weft insertion direction (towards the right in Fig. 2); T
is a tubular sub-nozzle whose upper end is closed, and is located at a distance a from the groove bottom 4a.
These sub nozzles 7-1, 7 are fixed to the sled 6 at a distance of 100 mm, and arranged in the weft insertion direction at intervals of several to ten or more poles.
-2, 7-3, 7-4, . . . The ejection direction line S of the nozzle hole 7a formed in the upper end portion is directed toward the guide groove 4 from the oblique weft insertion direction with a direction angle θ.

The main nozzle 5 starts jetting air slightly prior to weft insertion,
The weft yarn is injected into the guide groove 4 while being pulled against the unwinding resistance of the yarn supply source and the yarn guide resistance. Therefore, in order to ensure sufficient traction force in the main nozzle, it is necessary to set both the velocity and flow rate of the airflow large, and normally a nozzle hole with a diameter of several millimeters is used to perform injection at or near the speed of sound. let

Secondary nozzle? -1,? -2, γ-3.7-4...etc.
Usually, these are divided into several sets, and before the jet airflow of the main nozzle (hereinafter referred to as "main 1") or the weft tip reaches the vicinity of the weft insertion side sub-nozzle (the sub-nozzle near the main nozzle 5) in each set, Air is ejected from the sub nozzle of the relevant group (
This ejected airflow is hereinafter referred to as secondary wave height. Therefore, for example, the substream (S) of the subnozzle 7-1 located at the furthest weft insertion side is the main stream (M
) is forced diagonally forward and merges with it, and at that time, a part of the combined airflow escapes from the gap in the inductor (liquid state 2) to the back of the reed 1, resulting in the groove bottom 4 a K G 5 airflow (hereinafter, this airflow is referred to as an "undercurrent") is generated, and the weft yarns are guided by this and fly.

In this way, the main stream (M) flows through the guide groove 4 without successively merging the substreams of the next subnozzle, but in the meantime, the flow rate and flow velocity decrease, and for example, the substream of the subnozzle 7-4 decreases. Thereafter, the undercurrent (Sl) is mainly generated by the substream (S), and the weft yarn is conveyed by the undercurrent.

In addition, in the sub nozzle 7, the diameter of the nozzle hole 7a is usually 1
Appropriately, it is around 500 mm, and by supplying pressurized air above the critical pressure to this point, the initial ejection velocity is kept constant (sound velocity) even if the pressure fluctuates to some extent.

By the way, one of the difficult problems in such a weft guiding device is the flow force of the side stream (flow rate '/Sec and flow rate m/>ec
The question is how to set the vector quantity expressed as a function of

That is, in the sub-nozzle 7-1 on the furthest weft insertion side, the sub-stream (S) enters the main stream (M) whose flow force is not weakened yet, so that the flow force of the sub-stream at the confluence point, especially For example, in the sub-nozzle γ-4 on the -1 anti-weft insertion side, the reflected component from the groove bottom 4a increases, making it impossible to obtain a stable bottom flow. Therefore, it is troublesome in terms of adjustment work to change the flow force of the substream for each subnozzle or for each set.

Therefore, in the past, the flow force of the side stream was set by taking these contradictory conditions into consideration.

In other words, since the initial velocity of the jet from the nozzle hole γa is almost constant as described above, by increasing the air pressure supplied to each sub-nozzle and increasing the jet flow rate, the flow that can enter the main stream (M) can be increased. They had secured their position.

As a result, more pressure air than necessary is ejected from the numerous sub nozzles arranged on the opposite side of the weft insertion, which is extremely undesirable in terms of saving compression power, and furthermore, a reflected flow from the groove bottom 4a occurs. Because of this, there was a problem in that if conditions changed, the undercurrent would be disturbed, causing weave flaws.

Based on the above background, the present invention has the following configuration for the purpose of obtaining an open type weft guiding device with low air consumption.

That is, in the present invention, the pressure of the air fed to the sub nozzle is set to a value sufficient to generate a stable air flow at the bottom of the guide groove, and the flow force of the air flow (mainstream) injected from the main nozzle is set to a value sufficient to generate a stable air flow at the bottom of the guide groove. The sub-nozzle on the furthest weft-insertion side is disposed so as to be directed toward a portion where the flow force of the air flow (sub-flow) ejected from the nozzle is smaller.

FIG. 3 is an explanatory diagram of the operation of the present invention, where the horizontal axis is the distance from the injection port of the main nozzle, and the curve F is the mainstream flow curve F.
2 and F3 are the currents of the secondary streams in the conventional and the present invention, respectively, ll is the arrangement position of the most cotton inserting side secondary nozzle in the conventional technique, and lo is the intersection (merging point) of this secondary nozzle and the direction lines M and S. The distance in the width direction between A1, l, respectively indicates the placement position of the sub nozzle set in the present invention.

At the beginning of the jet flow, the flow force is abrupt due to collision with the atmosphere, and then the flow force is gradually attenuated due to friction with the atmosphere, etc., so each curve descends in a concave shape, and the degree of descent is determined by the flow force. In order of small jets, i.e. curve F,
, F, ,F, are steepest in the order.

Here, an example of the procedure for arranging the most weft-inserting side secondary nozzle as described above is as follows. That is, the target weft is arranged in the guide groove 4, and the weft is set at the direction angle θ. Sending air to appropriate sub-nozzles while adjusting the pressure and observing the behavior of the weft yarn,
When the stable underflow is generated, that is, when the behavior of the weft yarns is stable, that pressure is set as the feeding pressure to the sub nozzle, and then air is jetted out at a predetermined pressure from the main nozzle 5. When the substreams are merged and a stable airflow is generated, that is, until the behavior of the weft becomes stable, the confluence point of the substreams is moved away from the main nozzle 5 to set the confluence point 1o, that is, move to the subnozzle l. Position. Considering this, when the flow force of the sub-nozzle exceeds the flow force of the main nozzle, the jet flow from the sub-nozzle has a large influence on the flight of the weft yarn, which stabilizes the flight of the weft yarn. considered to be a thing.

As is clear from the above description, in the present invention, the flow force of the side stream near the groove bottom 4a is set to such an extent that the weft can be stably conveyed, and the flow force of the main stream is reduced to approximately the flow force of this side stream. Since the weft yarn is made to fly only by this main stream during the weft insertion process, the entry of the substream into the main stream is smoothed out on the most weft insertion side, and the flow rate of the substream is reduced, and the number of substream nozzles is also reduced. By reducing scales, it is possible to save pressurized air and achieve good weft insertion.

Next, an example of the present invention and its weaving test results are shown in the following table in comparison with a conventional one.

Using the inductor-cum-liquid type 2 of the test loom shown in Figure 1 Dimensions of the notch 30: Width 5.5 mm + depth 9 ru weaving width
: 150c1rL Reed density: Porosity 55% Main nozzle 5: Fiber guide tube outer diameter 1.5n Outer cylinder inner diameter 3, air pressure 3.0//cd Sub nozzle: Diameter of nozzle hole (7a) 1. 2 Distance from bottom of groove - 'J 12 Directional angle θ 5° Rotation speed: 510 RPM Test warp: Acetate 75 d, 19 f Test weft: Acetate 150 d, 40 f As is clear from this table, It can be seen that weft insertion can be carried out satisfactorily in the early stages using only the mainstream.

According to the present invention, air consumption can be reduced by greatly reducing the air pressure supplied to the sub-nozzle, and the flow rate of the sub-stream can be set relatively freely to prevent the occurrence of fabric flaws. It can be prevented.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the weft guiding device, Figure 2 is the ■- of Figure 1.
FIG. 3 is an enlarged cross-sectional view taken along line (2) and is an explanatory view of the operation of the present invention. 2... Liquid state that also serves as an inductor, 3... Notch, 4...
...Guiding groove, 4a...Groove bottom, 5...Main nozzle, γ・
... Sub nozzle, 7a... Nozzle hole of sub nozzle, FI.
...Flow reduction curve of the jet airflow of the main nozzle. F and F are curves for reducing the ejected airflow of the secondary nozzle closest to the main nozzle in the conventional and the present invention, respectively.Applicant: Akihiro Ohnishi, Patent Attorney, Agent of Nissan Motor Co., Ltd.

Claims (1)

[Claims] (1) Plate-shaped inductors having concave notches are arranged in the weft insertion direction, the entire guide groove is formed by the row of the notches, and air is pumped into the guide groove from the main nozzle oriented in the weft insertion direction. At the same time, air is ejected from a plurality of sub-nozzles arranged to be oriented in the diagonal weft insertion direction to generate an airflow along the bottom of the guide groove, and this airflow guides the weft while inserting the weft. In the guidance device, the pressure of the air sent to the sub-nozzle is set to a value sufficient to generate a stable airflow at the bottom of the guide groove, and the force of the airflow injected from the main nozzle is ejected from the sub-nozzle. A weft guiding device for an air jet loom in which a sub nozzle on the furthest weft insertion side is directed to a part where the air flow is smaller than the current.