JPH0423017B2 - - Google Patents

Description

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

Guide elements each having a substantially annular arm forming a guide hole for weft conveying air and a weft escape gap connected thereto are arranged in parallel in the weft insertion direction to guide the air ejected from the main nozzle while suppressing diffusion. , when weft insertion is performed by merging the air ejected from multiple air outlets formed around the guide hole on the non-weft insertion side of the nozzle-equipped guide arranged in the row of guides midway through the weft insertion. , it is necessary to eject air evenly from each air ejection port of the nozzle-equipped guide.

A conventional nozzle-equipped guide which supplies air evenly to each air outlet is disclosed in Japanese Utility Model Application Publication No. 11279/1983. Referring to FIG. 1, this is the base 51 of the guide with nozzle.
A branch wall 56 is provided in order to evenly divide air from the air passage 52 on the side to air passages 55a and 55b formed along the annular arm 53 and communicating with the air jet ports 54a and 54b.

However, in cases where branch walls are provided in this way, it is not possible to form an air outlet in that part, so the weft threads fly in uneven places and easily come into contact with the inner wall of the guide hole. There was a problem in that it caused a frequent occurrence of defective inserts.

In addition, the nozzle-equipped guide had problems in terms of strength. In other words, a guide with a nozzle generally forms an air passage inside by joining a pair of half-split members at their edges, but like other guides, the thickness is limited in order to allow the threads to enter and exit between the warp threads. Since the maximum height is about 3 mm, the wall thickness of each half member must be made as thin as possible in order to secure an internal air passage. On the other hand, since it is necessary to give the air ejected from the air outlet a certain degree of velocity, the air supply pressure needs to be 2 to 3 kg/ ^cm2 , and if the wall thickness is made thinner as described above, in rare cases However, there were times when a flat tire occurred.

In view of these circumstances, the present invention has been devised to effectively divide air without placing any restrictions on the arrangement of the air jet ports, and to improve the strength of the nozzle-equipped guide. It is intended to.

Therefore, in the present invention, in the air passage of the nozzle-equipped guide, a connecting part between a passage part that guides air from an external air supply source and a passage part that is formed in a substantially annular shape and communicates with the air jet port. A stay is provided that is located approximately in the center and connects a pair of side wall members such as half-split members, and this stay has a flow dividing function and a reinforcing function.

Examples of the present invention will be described below.

Referring to Figures 2 and 3, the loom frame 1
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
, there is a weft conveying air guide hole 10 with a tapered end.
and a weft escape gap 11 connected to the guide elements 12 are arranged at predetermined intervals in the weft insertion direction,
It is fixed with adhesive 13.

An appropriate 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 the rollers 20a and 20b come into contact with each other and the valve stem 21 is pushed up, and is closed when the lower portion 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
Like the normal guide 12, it has a base 29 and a substantially annular arm 30, and the arm 30 forms a tapered guide hole 10 and a weft escape gap 11. It has a bulging portion 31 at. and,
The nozzle-equipped guide 14 is made by welding a pair of half-split members 32 and 33 as side wall members at their edges, thereby making the inside hollow and forming an air passage 34.

Also, the guide hole 1 of the half member 32 on the side opposite to weft insertion.
0 is made thicker, and the inner peripheral portion of the guide hole 10 is integrally formed on the side of this half-split member 32, and a plurality of air jet ports 35 are provided around the thickened portion. The guide holes 10 are arranged at equal intervals in the direction and are oriented at one point on the axis of the guide hole 10. Here, the portion surrounding the guide hole 10 on the surface opposite to the weft insertion side where these air jet ports 35 open is a tapered surface 3 that is substantially orthogonal to the axis of the air jet ports 35.
It is set as 6.

In addition, the bulge 3 of the half member 32 on the side opposite to the weft insertion side
Attach the joint pipe 37 to the tip of 1 in a direction perpendicular to this.
The pipe 1 is welded to this joint pipe 37.
7 is connected.

A stay 38 is provided in the air passage 34 at approximately the center of the connecting portion between the passage part 34a formed in the bulging part 31 and the passage parts 34b and 34c formed in the substantially annular arm 30, The stay 38 connects the pair of half-split members 32 and 33.

Next, the effect will be explained.

During weft insertion, the weft yarn 24 is sent into the guide hole 10 of the guide element 12 by the air ejected 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 joint pipe 37 to the air passage 34, but first the bulge 3
1, and then the passage 34 formed in the substantially annular arm 30.
b, flows to 34c. At this time, air from the passage 34a is equally divided into the left and right passages 34b, 34c by the stay 38 provided approximately at the center of the connection between the passage 34a and the passages 34b, 34c. The air flowing into the passages 34b and 34c in the substantially annular arm 30 is evenly ejected from the plurality of air ejection ports 35 surrounding the guide hole 10 by the above-mentioned diversion effect. Here, air goes around the stay 38 and is supplied to the air outlet 35 provided on the rear side of the stay 38 with respect to the air flow in the passage portion 34a, and this portion is close to the supply side. There is no problem.

The air ejected from the air outlet 35 of the guide element 14 with a nozzle joins the air flow from the main nozzle 23 in the guide hole 10 of the next guide element 12 and boosts it, thereby counteracting the weft conveying air flow. The weft yarn 24 is further conveyed while being pulled at its tip end while suppressing a decrease in flow velocity on the weft insertion side.

The stay 38 of the nozzle-equipped guide 14 not only has the above-mentioned flow dividing function, but also functions as a pair of half-split members 32, 32.
Of course, the strength can be improved by connecting the two through the hollow part.

In addition, when there is no bulging part 31 and air is supplied from the base 29 side, a stay 38 is installed at the connecting part between the passage part in the base part 29 and the passage part in the substantially annular arm 30.
All you have to do is set it up.

Further, the shape of the stay 38 is appropriately set so as to divide the air evenly.

As explained above, according to the present invention, the simple structure of providing a stay in the air passage of a nozzle-equipped guide allows air to be distributed evenly within the air passage without placing any restrictions on the arrangement of the air outlet. In addition to being able to separate the flow, the strength of the nozzle-equipped guide can be greatly improved.

[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, 29...
...Base, 30...Substantially annular arm, 31...Bulging part,
32, 33... Half member, 34... Air path, 3
4a, 34b, 34c...passage portion, 35...air outlet, 38...stay.

Claims (1)

[Claims] 1. Guide elements 12 each having a substantially annular arm 30 forming a guide hole 10 for weft conveying air and a continuous weft escape gap 11 are arranged in parallel at a predetermined interval in the weft insertion direction, and the guide elements 12 are During the row, the side wall member 3
A nozzle-equipped guide 14 in which an air passage 34 is formed between 2 and 33, and a plurality of air outlets 35 are formed in a portion surrounding the guide hole 10 of the side wall member 32 on the side opposite to weft insertion.
In the air injection type loom, the air passage 34 includes a passage portion 34a for guiding air from an external air supply source 15, and the air jet port formed along the substantially annular arm 30. A nozzle-equipped guide for an air-injection type loom, characterized in that a stay 38 is provided to connect the side wall members 32 and 33, and is located approximately in the center of the connecting portion with the passage portions 34b and 34c communicating with the air injection loom.