JPH0341576B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a guide with a nozzle for an air-jet loom.

Conventionally, guide elements each having a weft conveying air guide hole with a tapered tip and a weft escape gap connected to the weft escape gap have been arranged in parallel at a predetermined interval in the weft insertion direction, and the guide hole allows air to be ejected from the main nozzle. The weft insertion method (single nozzle method) in which air is guided while suppressing diffusion and weft insertion is carried out on the guided airflow is well known.

The advantage of this method is that the ejected air for pulling the weft yarn, that is, for pulling out the weft yarn by overcoming the pull-out resistance on the storage section side, can also be used as the weft conveying airflow, so that the amount of air ejected can be reduced.

However, even though the guide element guides the airflow and suppresses diffusion, when the airflow is a certain distance away from the main nozzle, the flow velocity decreases due to diffusion, and the flow velocity becomes lower than the weft velocity. . In such a state, the leading end of the weft yarn flies only by its own inertia and is not pulled by any air current, so the trailing portion catches up and causes tangles, causing weaving flaws. For this reason, the weaving width is limited.

In view of these issues, the intermediate nozzle method was developed, in which a guide with a nozzle is placed near the position where the airflow velocity becomes lower than the weft velocity.
By adding airflow, the weft width can be expanded while making maximum use of the airflow from the main nozzle, and weft insertion can be ensured.

By the way, this type of intermediate nozzle type requires a guide with a nozzle, but in order to form an air passage inside, this guide with a nozzle needs to be formed in half, which is different from the conventional nozzle. An example of a half-split structure of an attached guide is shown in Japanese Utility Model Application Publication No. 11281/1981, for example.

However, the nozzle-equipped guide described in the above publication has two half-split members 5 as shown in
1 and 52 are welded at two joining parts A and B, and air jet ports 53 are formed at appropriate intervals along one joining part B, so that The disadvantage is that the welding is discontinuous, which makes the welding work cumbersome.

The present invention has been made with the aim of solving these drawbacks, and the approximately annular arm of the guide with a nozzle is divided into halves into a weft insertion side part and a non-weft insertion side part. The inner peripheral part of the guide hole is integrally formed on the side of one of the half members forming the weft insertion side part,
These two halves are welded at the joining part on the outer circumferential side and the joining part on the weft insertion side, and an air passage is formed between these two halves, and the part on the opposite side to the weft insertion side is welded. An air outlet is provided in one of the half-split members.

Examples will be described below.

Referring to Figures 2 and 3, frame 1 of the loom
A plurality of sleighs 3 are attached to a sled sword shaft 2 supported by a sled, and a reed holder 4 is fixed to the upper end of the sleds 3. The lower frame of the reed 6 and the guide holder 7 are inserted into the groove 5 of the reed holder 4, and are pressed and fixed by bolts 8. Groove 9 of guide holder 7
In this method, guide elements 12 each having a weft conveying air guide hole 10 with a tapered tip and a weft escape gap 11 connected thereto are arranged at a predetermined interval in the weft insertion direction using substantially annular arms. Insert the base and apply adhesive 1
It is fixed at 3.

A suitable number of nozzle-equipped guides 14 are arranged at appropriate intervals in a portion of the row of guides 12 that is relatively opposite to the weft insertion side.

The guide element 14 with a nozzle is provided with an air supply source 1.
A flexible pipe 1 connected to 5 via an on-off valve 16
7 is connected. The on-off valve 16 is attached to a stay 18 supported by the frame 1, and includes a high portion 20a of a cam 20 fixed to a rotating shaft 19 that rotates in synchronization with the main shaft of the loom, and a roller 22 attached to a valve stem 21. The valve stem 21 is opened when they come into contact with each other and the valve stem 21 is pushed up, and is closed when the lower part 20b and the roller 22 are opposed to each other.

In addition, 23 is a main nozzle, 24 is a weft, 25 is a heddle, 26 is a warp, 27 is a woven fabric, and 28 is a woven fabric.

Next, the detailed structure of the nozzle-equipped guide 14 will be explained.

Referring to FIGS. 4 to 6, the nozzle-equipped guide 14
Similar to a normal guide 12, a tapered guide hole 10 and a weft exit gap 11 are formed by a substantially annular arm, but it is divided in half into a weft insertion side part and a non-weft insertion side part. is formed. Here, a guide hole 10 is formed on the side of one half member 31 forming the opposite side of weft insertion.
The inner peripheral portion is integrally formed. Therefore, this one half member 31 and the other half member 32
In addition to being welded at the joint part A on the outer peripheral side, it is also welded at the joint part B on the side of the weft insertion side. Thereby, an air passage 33 is formed between these two half members 31 and 32.

Further, the guide hole 10 of the one half member 31
The wall thickness of the surrounding area is increased, and a plurality of air jet ports 34 that open on the surface opposite to the weft insertion side are bored in this area at equal intervals in the circumferential direction. Here, these air jet ports 34 are provided so as to point at one point on an extension of the central axis of the guide hole 10. Further, a portion surrounding the guide hole 10 on the surface opposite to the weft insertion side where these air jet ports 34 open is formed as a tapered surface 35 that is substantially perpendicular to the axis of the air jet ports 34.
Note that this tapered surface 35 does not necessarily have to be provided over the entire circumference, but may be provided partially around each air outlet 34.

Further, the nozzle-equipped guide 14 has a bulge portion 3 on the side.
6, and the air passage 33 also extends into this bulge 36. Then, this bulge 36
A joint pipe 37 is welded to the tip of the pipe 17 in a direction perpendicular to this.
are now connected.

Further, inside the nozzle-equipped guide 14, a reinforcing stay (pin) 38 is provided between the two half-split members 31 and 32 at a predetermined position of the connecting portion between the substantially annular arm and the bulging portion 36. will be provided.

Next, the effect will be explained.

During weft insertion, the weft yarn 24 is blown into the guide hole 10 of the guide element 12 by air jet from the main nozzle 23, and flies on the airflow guided by the guide hole 10.

Immediately before the tip of the weft 24 reaches the nozzle guide 14, the high portion 20a of the cam 20 comes into contact with the roller 22 and pushes up the valve rod 21, thereby opening the on-off valve 16. , pipe 17
Pressurized air is supplied to the guide element 14 with a nozzle.

The air supplied to the nozzle guide 14 flows from the side of the bulge 36 to the air passage 33 inside the substantially annular arm. At this time, by arranging the reinforcing stays 38 at appropriate positions, good air distribution can be achieved. The air flowing into the air passage 33 inside the substantially annular arm is ejected from the air ejection port 34. This ejected air joins the airflow from the main nozzle 23 within the guide hole 10 of the next guide element 12 and boosts it, thereby increasing the flow velocity of the weft conveying airflow and further conveying the weft 24.

Here, if we look at the joint parts A and B of the two halves 31 and 32 of the nozzle-equipped guide 14, these joint parts A and B are both continuous and can be continuously welded all around. In manufacturing the nozzle-equipped guide 14, productivity is improved and manufacturing costs can be reduced.

As explained above, according to the present invention, the half-split structure of the nozzle-equipped guide is changed so that the mating parts can be continuously welded, thereby improving productivity and reducing manufacturing costs. .

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional view of a guide with a nozzle showing a conventional example, Fig. 2 is a front view of the essential parts of a loom showing an embodiment of the present invention, Fig. 3 is a cross-sectional view taken from - in Fig. 2;
The figure is a front view of the same nozzle-equipped guide as above, FIG. 5 is a cross-sectional view taken from FIG. 4, and FIG. 6 is a rear view of FIG. 4. 10... Guide hole, 11... Gap for weft escape, 1
2... Guide element, 14... Guide element with nozzle, 23...
...Main nozzle, 31, 32...Half member, 33...
...Air path, 34...Air injection outlet, A, B...Matching portion.

Claims (1)

[Claims] 1 Air guide hole 1 for weft conveyance by a substantially annular arm
0 and a continuous weft escape gap 11 are arranged in parallel in the weft insertion direction at a predetermined interval, and a nozzle-equipped guide 14 has an air outlet 34 between these guides 12. In an air injection loom, the substantially annular arm is divided into a weft-insertion side portion and a non-weft-insertion side portion, and one half portion forming the anti-weft-insertion side portion; The inner peripheral part of the guide hole 10 is integrally formed on the 31 side, and the two half members 31 and 32 are welded together at the joint part A on the outer peripheral side and the joint part B on the weft insertion side, These half members 31, 32
An air passage 33 is formed between them, and an air outlet 3 is formed in one half member 31 forming the opposite side of weft insertion.
4. A nozzle-equipped guide for an air injection loom, characterized in that a nozzle is provided.