JPS61194253A - 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 Field of Industrial Application The present invention relates to a weft inserting device for an air-injection type loom, and more specifically to a so-called closed weft inserting device that is equipped with a guide hole that is almost closed around the entire circumference, leaving a gap for weft escape. This invention relates to a weft insertion device using a type of weft guide.

BACKGROUND OF THE INVENTION Various types of weft insertion devices as described above have been proposed and put into practical use, but most of them have a guide hole 108 formed in the base end 107a, as shown in FIGS. 6-7, for example. A large number of weft guides 107 having widening portions 107c that gradually become wider toward the head 107b are arranged on the sled to form a guide passage, and air is introduced into this guide passage from the main nozzle and the auxiliary nozzle 116. It is designed to eject and send the weft threads flying in a meandering manner.

Problems to be Solved by the Invention According to the above-mentioned conventional technology, the weft guider is formed with a widening part from the base end toward the head, so that when the weft guider enters and retracts the weft threads, the weft threads move smoothly between the weft threads. This has the advantage of preventing accidents such as the weft thread guide getting caught between the weft thread guide and the weft thread. On the wall surface, an outflow airflow 132a escaping outward from the gap between the adjacent weft guides 107, 107 and a suction airflow 133a flowing in from the outside are generated. The outflow airflow 132a and the suction airflow 133a flow from the lower wall surface of the guide hole 108 because the length from the lower wall surface to the outer edge of the widened portion 107c is longer than the length from the upper wall surface to the outer edge of the head. In addition, it is difficult to generate suction airflow, and the high-velocity part of the airflow in the guide passage is biased upward, and the weft threads meander above the center, making it easier for them to come into contact with the upper wall surface of the guide hole.
This created resistance and was one of the factors that reduced the weft speed.

Means for Solving the Problems The present invention attempts to solve the problems while retaining the advantages of the above-mentioned conventional technology.The shape of the guide hole of the weft guide is made almost vertically symmetrical, and the widened part has the following features: It is characterized by having an air intake hole independent of the guide hole.

Effect According to the above configuration, the air flow from the main nozzle and the auxiliary nozzle flows out at the upper and lower wall portions of the guide hole.

When inflowing, the airflow can easily flow through the air intake holes in the lower wall. The outflow airflow is also made easy to flow out to the air intake hole, so that the airflow in the guide passage is almost uniform in the vertical direction, and the weft threads are allowed to fly without being biased vertically.

Embodiment FIGS. 1 and 2 show a weft inserting device for an air-injection type loom, in which 1 is a sleigh that is oscillated by a sled saw blade (not shown), 2 is a reed attached to the top surface of the sled 1, Reference numeral 3 designates a main nozzle for inserting the weft, which is also attached to the upper surface of one end of the sled 1, and is configured to spray the weft yarn 30 toward the other end of the sled 1, as is well known. Reference numeral 4 denotes a mounting bar in the shape of an oblong regular square prism that is integrally attached to the upper surface of the sleigh 1 on the cloth side of the acid 2, and a mounting groove 4a is formed in the longitudinal direction on the upper surface, and an air passage 5 is formed in the longitudinal direction. A plurality of passages 6 communicating with the air passage 5 are formed at required intervals on the upper surface. Reference numeral 7 denotes a thin plate-shaped weft guide whose base end 7a is inserted into the mounting groove 4a of the mounting bar 4 and fixed with adhesive, except for the location where the auxiliary nozzle (the location of the passage 6) described below is arranged. A large number of them are arranged closely at the same location. In addition.

A weft guide 7 may be provided with a part removed in a portion corresponding to the auxiliary nozzle.
It has a widened part 7c that gradually becomes wider as it goes from a to the head 7b where the guide hole 8 is formed, and its outer edge 7d
is formed so that it is substantially orthogonal to the weft Y. The guide hole 8 has a diameter of 1°.

It is formed into a substantially rectangular shape asymmetrically on the road with respect to the vertical center line CL in FIG. 3, and furthermore, a weft escape gap 9 is formed diagonally upward at the upper corner of the guide hole 8 on the reed 2 side. As shown in FIG. 3, on the wall surface 8a of the guide hole 8 on the side opposite to the weft exit (weaving front side), there is formed a diversion convex portion 10 extending toward the auxiliary nozzle side (weft exit side), which will be described later, at the upper and lower intermediate parts. Flow diversion concave portions 11 and 12 are provided on the upper and lower sides of the diversion convex portion 10, respectively.
is formed. The surface of the diversion convex portion 10 is the wall surface 8a
A convex curved surface 10a formed by projecting the upper and lower intermediate portions into a substantially arc shape.
The inner surfaces of the diversion recesses 11 and 12 are formed by the convex curved surface 10a and the upper and lower wall surfaces 8b and 8c of the guide hole 8, respectively.
concave curved surface 11 that is concave in a substantially arc shape so as to be continuous with each other;
It is composed of a and 12a. In addition, projecting portions 13.14 that are continuous with the concave curved surfaces 11a and 12a and slightly protrude inward are formed on the side portions of the upper and lower wall surfaces 8b and 8c on the side of the diversion recessed portions 11.12, respectively, As a result, the branching recesses 11, 12 are formed so as to extend above and below the projecting portions 13 and 14. The above-mentioned overhanging portion 13.
The surface of 14 is formed into gently convex curves 13a and 14a. The upper and lower wall surfaces 8b and 8c are formed such that the distance between them gradually increases toward the weft escape side. A triangular air intake hole 31 is formed in the widened portion 7c, and the shape and size of the air intake hole 31 are determined by the upper and lower walls 8b and 8 of the guide hole 8, as shown in FIG.
At C, the conditions of the outflow airflows 32a, 32b escaping outward from the gap between the adjacent weft guides 7, 7 and the suction airflows 33a, 33b flowing in from the outside are set to be approximately the same.

As shown in FIG. 4, the guide holes 8 of each weft guide 7 are arranged in a row to form a guide passage 15 for guiding the weft insertion air and the weft 3.

Next, reference numeral 16 denotes an auxiliary nozzle inserted into the passage 6 of the mounting bar 4, with a part near the upper end facing into the guide passage 15. The auxiliary nozzle 16 has an injection hole 17 formed at a height opposite to the approximate center of the guide passage 15 and oriented obliquely to the weft insertion direction (in the direction of the arrow in FIG. 4).

Although the injection hole 17 is composed of one circular hole, it may be composed of a plurality of holes.As shown in FIG. 4, a plurality of the auxiliary nozzles 16 are arranged at required intervals. There is. These auxiliary nozzles 16 are located downstream of the position where the main flow of the auxiliary air flow injected from the auxiliary nozzle 16 one upstream reaches the wall surface 8a of the guide hole 8 on the side opposite to the weft exit side. It should be noted that compressed air is supplied to each of the auxiliary nozzles 16 at a predetermined timing by an air supply device (not shown) every time compressed air is injected from the main nozzle 3, and is directed from the injection hole 17 toward the upper and lower intermediate portions of the wall surface 8a. auxiliary air is injected.

In the weft inserting device configured as described above, when the weft guide 7 enters the warp Y, it gradually divides the warp 7 into left and right (in the machine machine longitudinal direction) from its head 7b.

In addition, since the width in the beating direction increases, the warp threads Y do not become narrower on the way to the weft guide 7.
The weft guide 7 enters into the warp Y smoothly. Then, when compressed air is injected from the main nozzle 3, the weft yarn 30 in the main nozzle 3 is inserted into the guide passage 15 by the air flow from the main nozzle 3, and is conveyed in the weft insertion direction.

Furthermore, when compressed air is injected from the main nozzle 3,
Auxiliary air is injected from the injection hole 17 of each auxiliary nozzle 16 at a predetermined timing. The main flow of the auxiliary air flow from these injection holes 17 is injected obliquely to the weft insertion direction toward the upper and lower intermediate portions of the wall surface 8a on the opposite weft escape side of the guide hole 8, as shown in FIGS. 3 and 4m. Ru. The main stream (center) of the auxiliary air flow has a high flow velocity, and the flow velocity decreases toward the peripheral surface. The main stream of the auxiliary air flow contacts the wall surface 8a of the guide hole 8 on the side opposite to the weft exit, and is actively directed toward the upper and lower flow recesses 11 and 12 by the flow dividing convex portion 10 of this wall surface 8a, as shown in FIG. The main stream is divided and diffused into the upper and lower parts of the main stream, and by this upward and downward diffusion, the main stream is guided into the dividing recess 11.12 and rectified in the weft insertion direction.
As a result, the auxiliary air flow injected from the auxiliary nozzle 16 spreads over a wide range on the opposite weft exit side of the guide passage 15 to an effective flow velocity region where the flow velocity in the weft insertion direction is high. form. A part of the airflow swirled by the upper and lower flow dividing recesses 11 and 12 as described above tends to head toward the weft exit side, but these airflows are auxiliary airflow from the next auxiliary nozzle 16. The flow is rectified in the weft insertion direction, and the flow toward the weft exit side can be suppressed. In the above case, in this embodiment, the overhanging portions 13 are provided on the upper and lower wall surfaces 8b and 8C of the guide hole 8.
．． 14 is formed, and the airflow swirled by the one-way branch opening 11.12 is directed to the guide passage 15 by the overhanging parts 1 and 3.14.
Since the swirling airflow is further rectified in the weft insertion direction, these airflows are combined near the center of the guide passage 15 and rectified in the weft insertion direction. An effective flow velocity region is created over a wide range within the passage 15. Therefore, the main air flow injected into the guide passage 15 from the main nozzle 3 and the weft yarn 30 are stably run in a wide flow velocity region in the weft insertion direction within the guide passage 15. In addition, as described above, since the air flow toward the weft escape side is almost completely eliminated, accidents such as the flying weft 30 escaping from the weft escape gap 9 or being caught in the weft escape gap 9 are prevented. .

Now, looking at the air flow in the vertical direction of the guide passage 15 at this time, as shown in FIG.
On the upper wall surface 8b of the guide hole 8 between the holes 7 and 7, an outflow airflow 32a and an intake airflow 33a are generated as in the conventional case. On the other hand, on the lower wall surface 8c of the weft guide 7, the outflow airflow 32b flows out to the air intake hole 31, and on the lower wall surface 8c of the adjacent weft guider 7, the inflow airflow 33b flows in through the air intake hole 31. death,
Inflow and outflow air flows 32a and 33 at the upper wall surface 8b, respectively.
Inflow and outflow airflows 32b and 33b of the same degree as a are generated, and an airflow that is almost vertically symmetrical with respect to the axis CL is realized, and the high-velocity portion is not biased upward or downward. The weft threads 30 are flown in a meandering manner approximately at the center in the vertical direction, and are attached to the upper and lower wall surfaces 8 of the guide hole 8.
b, 8c is reduced.

In this embodiment, as described above, the auxiliary air flow injected from the auxiliary nozzle 16 is actively diffused and quickly rectified in the weft insertion direction, so that the auxiliary air flow is effectively used for weft flying. can be used.

As a result, the amount of air consumed for weft insertion can be significantly reduced. In addition, as mentioned above, the guide passage 15
Since it is possible to create an effective wide flow velocity and wax area on the side opposite to the weft escape side, the area of the guide hole 8 of the weft guide 7, that is, the cross-sectional area of the guide passage 15, can be significantly reduced. Air consumption for weft insertion can be reduced and the weft guide 7 can be downsized. Furthermore, as described above, a wide flow velocity region can be created by active diffusion of the high-speed flow component of the auxiliary air flow, so even if the injection hole 17 of the auxiliary nozzle 16 is made into one circular hole, a wide flow velocity region can be created. This makes it possible to easily process the injection holes 17.

Effects of the Invention As described above, in the present invention, since the weft guide has a widening part that gradually becomes wider from the attachment part toward the head, the weft guide can smoothly go in and out of the warp. be able to. Moreover.

A guide hole and another air intake hole are provided in this widened part, and the shape of the guide hole is almost vertically symmetrical, and the guide hole is directed toward the vertical center of the inner surface of the guide passage formed by the guide hole on the side opposite to the weft escape side. Since the air is injected from the auxiliary nozzle in the vertical direction of the guide passage, the airflow is not unevenly formed in the longitudinal direction of the guide passage, and the weft can be made to fly stably. Therefore, the weft can be prevented from meandering in the longitudinal direction. However, it flies almost in the center of the guide passage, reducing contact with the upper and lower wall surfaces of the guide hole, and as a result, the resistance applied to the weft yarns is reduced, and the amount of air consumed can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the device of the present application, Fig. 2 is a longitudinal sectional view, Fig. 3 is an enlarged view of the head of the weft guide, Fig. 4 is a sectional view taken along line I-1 in Fig. 1, and Fig. 5 is a longitudinal sectional view. FIG. 1 is a cross-sectional view taken along the line ■--■, FIG. 6 is a conventional weft guide, and FIG. 7 is a conventional cross-sectional view. ■... Slay, 7... Weft guide, 7a...
Base end portion, 7b...head portion, 7c...widened portion, 8
...Guidance hole, 15...Guidance passage, 16...
Auxiliary nozzle 30...weft, 31...air intake hole Patent applicant Howa Kogyo Co., Ltd. No. 1 ■ No. 2 ■ No. 3 WJ ssm

Claims (1)

[Claims] 1. A large number of weft guides having widening parts that gradually become wider from the base end toward the head are arranged on the sleet, and the rows of guide holes formed in these weft guides are used to control the weft insertion air. A guide passage is formed to guide the weft, and an auxiliary nozzle is appropriately arranged on the weft exit side of the guide passage, and auxiliary air is jetted from the auxiliary nozzle toward the vertical center of the opposite side of the weft exit inside the guide passage. In the weft insertion device of an air injection loom, the shape of the guide hole in the weft guide is approximately vertically symmetrical, and the widened part has an air intake hole independent of the guide hole. A weft inserting device for an air injection loom, characterized by the following: