JPS5953376B2 - Air injection loom weft insertion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air injection type loom having a weft injection nozzle (main nozzle) and a plurality of auxiliary nozzles so that the weft is conveyed mainly by air ejected from the auxiliary nozzles. This invention relates to a weft insertion device.

Conventionally, as this type of weft inserting device, the following device has been proposed by the present applicant (Japanese Patent Application No. 14239/1989).
6).

That is, a recess is formed by the bent part to surround the shed on three sides, and a straight part is provided to close the open side of this recess, and the straight part and the bent part form a substantially trapezoidal shape. Yarn guides with guide holes are lined up in the direction of the shed, and a plurality of auxiliary nozzles arranged between the rows of these yarn guides blow air into the recess (the short side of the trapezoid) diagonally to the shed. By ejecting air from the main nozzle, the air ejected from the main nozzle is limited to the extent that it pulls the weft yarn and sends it out into the warp opening, and the conveyance of the ejected weft yarn is left to the air ejected from the auxiliary nozzle. be.

More specifically, when the weft tip reaches the auxiliary nozzle closest to the main nozzle, the auxiliary nozzle blows out air to blow the tip toward the side opposite to the weft insertion side, and it also sprays an appropriate amount of air between the yarn guides. By escaping from the gap to the rear, the weft is pushed to the vicinity of the bottom of the recess, the thread path is stabilized, and the weft is conveyed over a predetermined section, and this action is carried on one after another to the next auxiliary nozzle to perform weft insertion. In addition, the air reflected from the recess is reflected by the inner surface of the guide hole (the long side of the trapezoid), which is almost closed in the circumferential direction, and this is repeated appropriately to reach the next place. By guiding the air to the vicinity of the auxiliary nozzle, the escaping air is kept to a level that is used for stabilizing the yarn path, and the reflected air increases the conveyance effect at the next auxiliary nozzle, thereby reducing the amount of air ejected from the auxiliary nozzle. It is also possible to save on costs.

However, the thread guide used here has a guide hole formed in an almost geometric shape and has corners, so a vortex is generated there, and the energy of the air flow is reduced by this vortex. As a result, there remains the problem that the weft conveying ability is reduced accordingly.

Therefore, in order to eliminate the corners, the present inventors made the guide hole into parallel parts of the same length, corresponding to the conventional short and long sides, and connected these parallel parts with an arc (hereinafter referred to as We investigated a model with a slot-shaped guide hole, but if the auxiliary nozzle blows air into the center of the slot-shaped guide hole, when the weft swings in the longitudinal direction of the slot, the weft escapes from the weft escape gap. There was a problem in that the weft threads flew out due to the leaking airflow, resulting in poor weft insertion.

The present invention has been made in view of the above circumstances, and the guide hole for the thread guide is formed into a long hole in the vertical direction with the upper circular arc portion facing the weft exit gap. Air is ejected from the auxiliary nozzle above the center of the guide hole to generate a high-speed airflow above the guide hole, and this airflow transports the weft yarn, which acts as an air curtain and pushes the weft yarn to the side of the weft escape gap. The above problem is solved by preventing this from happening.

In addition, in the past, there are devices that generate two airflows above and below the guide hole using a pair of auxiliary nozzles, but in order to do this, the guide hole must be made very large to prevent the two airflows from interfering with each other. Since the weft yarns become tangled, it is difficult to make the guide hole as small as possible to improve air utilization efficiency.

The present invention will be described in detail below according to an embodiment shown in FIGS. 1 to 5.

In the figure, 1 is a reed, 2 is a thread guide device, and 3 is a thread guide that constitutes the thread guide device.

The thread guide 3 has a straight part 3a and a curved part 3b, and a guide hole 4 is formed in the thread guide 3.
and a weft escape gap 5 connected thereto are formed, and furthermore, this guide hole 4 has an inner surface on the straight portion 3a side as one parallel portion 4a, and an intermediate portion inner surface on the curved portion 3b side as the other parallel portion 4b. It is formed into a substantially long hole (elongated hole) with circular arc parts 4C and 4d at the top and bottom, and the weft exit gap 5 is formed between the upper circular arc part 4C and the parallel part 4a.

The yarn guides 3 thus formed are arranged with a predetermined gap, and their bases are inserted into the grooves of the guide holder 6 and fixed with adhesive. A guide passage 4A is formed.

The guide hole 4 is formed straight without any particular taper, and has an appropriate width (thickness of the thread guide 3) so that it can reflect the ejected air, which will be described later.

The guide holder 6, together with the lower frame of the reed 1, is inserted into a groove of a reed holder 8 fixed to the upper end of a sleigh sword 7 that swings back and forth, and is fixed with a bolt 9.

10 is a weft injection nozzle (main nozzle); 11 is a weft; 1
2 is a warp, 13 is a woven fabric, and 14 is a woven fabric.

Further, the guide holder 6 is divided into a plurality of parts, and an auxiliary nozzle holder 16 is fixed between the end faces thereof.

In the auxiliary nozzle holder 16, an auxiliary nozzle 17 having a pipe-shaped main body is erected between the straight portions 3d of the adjacent thread guides 3 so as to be substantially parallel to them.

The auxiliary nozzle 17 is provided through a through hole (
(not shown) with an introduction pipe 18 separately fixed to the holder 16, and this pipe 18 extends forward and downward along the lead holder 8.

A flexible pipe 19 is connected to the introduction pipe 18 and is connected to a pressure air supply source via an on-off valve (both not shown).

The upper end of the auxiliary nozzle 17 is closed and formed into a conical shape with a radius at the top.
A has been opened.

This nozzle opening 17a is formed at a predetermined angle (1
Therefore, the jetting direction line N of the nozzle orifice 17a is obliquely intersected with the direction of the guide passage 4A, and the jetting direction line N of the nozzle orifice 17a is arranged so as to be oriented in the direction of the guide passage 4A with an angle of about 2°). The inner surface of the guide hole 4 of the thread guide 3 on the side is oriented such that the upper side of the parallel portion 4b is perpendicular thereto.

Note that the air jetting from the nozzle opening 17a of the auxiliary nozzle 17 starts from when the tip of the weft 11 reaches the vicinity of the auxiliary nozzle 17 at the latest. It is until the beginning.

In addition, an appropriate number of thread guides 3 disposed next to the auxiliary nozzle 17 have arc-shaped notches 20 (first 4) may be formed as necessary.

This eliminates the need for the auxiliary nozzle 17 to protrude into the guide path 4A, and prevents the weft 11 from getting caught in the auxiliary nozzle 17 and resulting in poor weft insertion.

Next, the action will be explained.

When the reed 1 moves backward, the thread guide 3 of the thread guide device 2, which moves together with the reed, passes through the warp threads 12 and enters the opening thereof, and almost at the same time, the auxiliary nozzle 17 also moves the warp threads 12 at its top.
and enter the opening.

Then, from the time when the guide hole 4 of the yarn guide 3 no longer intersects with the warp 12, pressurized air is injected into the guide hole 4 from the main nozzle 10, and the weft 11 is carried on this air flow, and the injection and weft insertion begins. .

Immediately before the tip of this weft 11 reaches each auxiliary nozzle 17, pressurized air from the pressurized air supply source is supplied to the auxiliary nozzle 17 via the pipe 19.18 and the holder 16 by the opening operation of the on-off valve. The liquid is ejected from the nozzle opening 17a in a determined direction as described above.

As a result, the weft yarn 11 is connected to the nozzle opening 17a of the auxiliary nozzle 17.
The material is successively blown away by air currents from the air, and flies along with it, and is inserted into the weft.

When the weft insertion is completed, the blowing of air from the main nozzle 10 and the auxiliary nozzle 17 is stopped, and as the reed 1 continues to advance, the yarn guide 3 and the auxiliary nozzle 17 exit from the opening of the warp 12.

At this time, the weft yarn 11 escapes from the guide hole 4 through the weft escape gap 5 while being supported by the lower warp yarn 1 forming the opening, and is then reeded onto the fabric front 13 by the reed 1 to form the woven fabric 14. is woven.

To explain the above-mentioned weft insertion state with reference to FIGS. 3 and 4, the weft 11 is pulled toward the jetting direction line N in the vicinity of the auxiliary nozzle 17, as shown in FIG. It is pressed against the upper side of the parallel part 4b along it, and then flies in the direction of the theoretical reflection direction line N' in the parallel part 4b,
Furthermore, while following the direction of the theoretical reflection direction line N'' in the parallel portion 4a, it is attracted to and flies along the ejection direction line N of the next auxiliary nozzle 17, which is parallel to the theoretical reflection direction line N''.

However, this effect is performed only in the area on the weft insertion side where the air ejected from the main nozzle 10 has a weft conveying effect and can boost the air ejected from the auxiliary nozzle 17; An appropriate amount of air ejected from the yarn guides 3 escapes from the gap between the yarn guides 3, particularly behind the parallel portion 4b, so that the weft yarn 11 advances linearly along the parallel portion 4b as shown in FIG.

Also in this case, the reflected air out of the air ejected from the auxiliary nozzle 17 is effectively used in the next auxiliary nozzle 17, thereby enhancing the conveying effect of the weft yarn 11 and ultimately reducing the amount of pressurized air.

By the way, the air ejected from the auxiliary nozzle 17 is ejected above the elongated guide hole 4, and this airflow causes the weft 11
However, this airflow itself becomes a so-called air curtain for the weft yarn 11 introduced from the main nozzle 10 into the center of the elongated hole, and even if the weft yarn 11 swings, it will jump over this airflow and escape. It does not reach the air gap 5, and therefore does not fly out on the airflow leaking from this gap 5.

As explained above, according to the present invention, the guide hole is made into a long hole shape having two parallel parts, and the reflected air can be used effectively, so that the weft conveying effect is enhanced, and as a result, Can save pressure air.

In addition, since the pair of opposing parallel parts are connected by a circular arc to form a long hole, there are no corners and no vortices are generated.

Furthermore, since air is ejected from the auxiliary nozzle above the oblong guide hole, that is, closer to the weft escape gap than the center, this airflow can be used as an air curtain, allowing the weft to escape from the weft escape gap. It is extremely suitable because it does not fly out due to leaking air currents.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a side longitudinal cross-sectional view, Fig. 3 is a perspective view of the main part, Fig. 4 is a plan cross-sectional view of the main part, and Fig. 4 is a cross-sectional plan view of the main part. FIG. 5 is an enlarged side view of the thread guide. 3... Thread guide, 4... Guide hole, 4a,
4b...Parallel part, 4C, 4d...Circular part, 5...Gap for weft escape, 10...
Main nozzle, 11...Weft, 17...Auxiliary nozzle, 17a...Nozzle opening.

Claims (1)

[Claims] 1. A row of yarn guides arranged at predetermined intervals in the weft insertion direction and forming a guide path with their guide holes, and an auxiliary nozzle arranged between the yarn guides and jetting air obliquely toward the guide holes. In the weft inserting device of the air injection loom, which carries out the weft insertion by conveying the weft by air ejected from these auxiliary nozzles, the guide hole has an upper circular arc portion on the side of the weft exit gap, and this upper circular arc. A vertically long hole is formed by a pair of parallel parts that are connected to each other and a lower circular arc part that connects these parallel parts, and air is ejected from an auxiliary nozzle above the center of this guide hole. A weft inserting device for an air-injection loom, which is characterized by: