JPS6032732B2 - Air injection loom weft insertion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an air injection system which has a reed yarn injection nozzle (main nozzle) and a plurality of auxiliary nozzles, and transports the twill yarn mainly by air jetted from the auxiliary nozzles. This invention relates to a striping device for a type loom.

There are two typical silk inserting methods in conventional air-jet looms.

The first is that the jetted air from the main nozzle first pulls and sends out the yarn from the yarn feeding source, and then guides the jetted air to relatively thick walls that are relatively densely lined up along the village road. Of child-
The striped yarn is conveyed by placing the striped yarn on the airflow by guiding it to the opposite side of the twilling side while concentrating it toward the center using the tapered guide hole.
In this case, if necessary, an auxiliary nozzle may be arranged between the guides on the side opposite to twilling to boost the airflow. The second method is to arrange relatively thin thread guides with recesses (this thread guide may also use zenuba) in such a way that the recesses surround the village road on three sides, and to arrange them relatively roughly. By jetting air obliquely toward the recess from a large number of auxiliary nozzles arranged at appropriate intervals in the Azusaido direction, the jetted air from the main nozzle is limited to the extent that it can pull the weft and send it out. The conveyance of the sent out striped yarn is entrusted to air ejected from the auxiliary nozzle.

That is, in this second method, when the total yarn tip reaches the auxiliary nozzle closest to the main nozzle, air is ejected from the auxiliary nozzle to blow the twill yarn tip toward the side opposite to the twill insertion side. By escaping behind the gap between the yarn guides, the striped yarn is conveyed for a predetermined distance along the bottom of the recess, and this action is successively applied to the next auxiliary nozzle to perform grooving. It is. As is clear from the above explanation, in the first method, a series of guide passages closed in the circumferential direction are formed by the guide holes of the guide element, so that the air jetted from the main nozzle is conveyed to the opposite side of the twilling side. On the other hand, as mentioned above, this injected air is subjected to the east-centering action one after another, that is, in the process of being changed in direction from the center to the center, the flow resistance due to this is accumulated, and it is also guided slightly. The flow velocity gradually decreases due to the unavoidable leakage from the gaps, etc., and therefore problems still remain for wide and medium weaving.

In addition, the second method is effective for wide medium weaving because it can reduce the amount of air injected by the main nozzle and divides the conveyance of the striped yarn into small sections and sequentially distributes the conveyance to a plurality of auxiliary nozzles. An air flow for transporting the yarn is formed along the bottom of the recess, and this air flow encounters wall resistance due to flowing near the wall surface, causing the flow velocity to attenuate quickly and slow down. The path was not stable, and weft insertion problems could occur due to snags, etc.

In addition, the air ejected from the auxiliary nozzle is not allowed to escape as described above while still retaining sufficient velocity energy.
Not only is it unavoidable, but the air reflected from the bottom of the recess is also diffused and cannot be used for conveying the weft yarn, which increases the number of auxiliary nozzles and reduces compressed air consumption. There was a problem. Therefore, based on the idea that the striped yarn is conveyed mainly by the air ejected from the auxiliary nozzle as in the second method, instead of the conventional yarn guide, the array of guide elements of the first method, That is, the inventors of the present invention attempted to solve the problems of the second method by using guide elements having tapered guide holes arranged relatively densely, and this method was has already been proposed (Tokugan Sho 54-134242).

Next, based on the method described above, the present inventors conducted an experiment in which the cross-sectional area of the guide passage, that is, the diameter of the guide hole, was reduced in order to further reduce the amount of ejected air.

That is, in FIG. 4, as a result of repeated experiments by successively reducing the equal temperament D' of the guide hole A with a taper T to 18 ribs, 16 ribs, and 14 ribs, a good stripe was obtained while achieving the desired purpose. I was able to insert it, but when I made the same diameter 〇 12 threads, there was some jump in the weft tip and it seemed to get caught in the weft escape slit B, and I also cut the same diameter D' to 1 cape. It has been confirmed that when the weft is reduced, the tip of the weft jumps out of the slit B, making it impossible to insert the weft. The other conditions in the above experiment were as follows. Bhupa T angle 7o
(One side) Thickness of guide 2.9 Gap between guides 0.8 Rib auxiliary nozzle diameter 1. Arrangement pitch of the pillow: 10 Arc jetting direction: 12 degrees with respect to the axis of the guide passage.Furthermore, the broken line C shown in FIG. 4 is the locus of the tip of the striped yarn sketched by observing it from the side opposite to the weft insertion side when the jump occurs.

When considering the causes of the above-mentioned phenomenon, the first thing to consider is the influence of the taper T attached to the guide hole.

In other words, the taper T was originally provided to concentrate the airflow passing through the row of guide holes A one after another, so the airflow inside the guide passage repeatedly contracts and expands as it passes through. It is naturally assumed that Therefore, when the guide hole diameter 〇 is vertically decreased, the cross-sectional area of the guide passage decreases rapidly due to its square relationship. Therefore, at a certain guide hole diameter, for example, under the above experimental conditions, at 12 legs, the influence of predetermined contraction and expansion covers almost the entire area of the guide passage. As a result, the free end, ie, the tip, of the silk thread would have a bounce. Next, when the taper of the guide hole was abolished and a straight hole was used under the above conditions, the jump was reduced in the middle, and it was quite good with the guide hole diameter of 12 ribs, but with the same diameter of 10 ribs, the tip of the striped thread Even though the stripes tended to protrude from the slit B, it was possible to make stripes.Furthermore, when the same diameter was made of 7 willow, it was impossible to insert twills due to the protrusion. The results of further consideration of this pop-out phenomenon are as follows. In other words, although the guide peacock can be arbitrarily reduced in size as long as it does not obstruct the airflow path, the slit B cannot be reduced in size because the weft passes through it, and therefore the cross-sectional area ratio between the slit B and the guide path is As a result, the ratio of airflow components escaping from this slit also increases, and the tip of the twill yarn is likely to be drawn by this escaping airflow and fly out. and,
It is estimated that the above-mentioned relative increase in the escape airflow exceeds the relative increase in the airflow leaking from the gap between the guide elements due to the elimination of the taper of the guide hole. Nara-sama, based on the idea that the leakage airflow from the gap between the guides should be further increased by an appropriate amount in order to offset the harmful escape airflow component, the results of an experiment in which the question gap was widened are as described above. The results are shown in Table 1 together with the results of the previous experiment. Table 1 Guide thickness 2. Comprehending the above results, the guide hole diameter has a lower limit around 12 skin in the total entry system in which the tapered guide hole and the main and auxiliary nozzles are roughly matched. If you are trying to set the height below that, you can achieve a good striping function by eliminating the taper of the guide hole and setting the gap size so that the airflow will leak out from the gap between the guides appropriately. In this case, the lower limit of the guide hole diameter is around 6 skins.

The present invention has been made through the process described above, and the air ejected from the main nozzle is guided as far as possible by a series of guide passages closed in the circumferential direction by the guide hole of the guide element.
Based on the first method of adding an auxiliary nozzle to boost the airflow, the object of the present invention is to further reduce the amount of air consumed. Therefore, the present invention aims to sufficiently reduce the amount of air consumption by reducing the guide hole diameter to a range where conventional tapered guide holes cannot form stripes. Although some air leakage is allowed by setting the inter-element gap appropriately, in the end it is possible to achieve striping with the help of the leakage airflow, while saving a large amount of money as a result. This is what I did.

The present invention will be explained below according to an embodiment shown in FIGS. 1 to 3.

In the figure, 1 is a coin, 2 is a guide device, and 3 is a guide element constituting the guide device 2. Each guide element 3 has a substantially circular shape formed by a straight part 3a and a curved part 3b branched from the straight part 3a. A guide hole 4 and a weft exit slit 5 are provided.

Here, the guide hole 4 is formed straight without any particular taper in its axial direction. Then, the guide elements 3 are arranged in parallel with a predetermined gap, and their straight portions 3a
The lower end of the guide holder 6 is inserted into the groove of the guide holder 6 and fixed with an adhesive, and the row of guide holes 4 forms a guide passage 4A for silk thread conveying air. Then, the diameter of the guide hole 4, the gap between the guide elements 3, etc. are set within the range in which it is recognized that striping is possible in Table 1. That is, the diameter of the guide hole 4 is set to 6 to 1
The gap between the second side and the guide element 3 is set to 0.8 to 1.6 side, and the product of the diameter and the gap is set to be 7 or more. The guide holder 6 is attached to the lower frame of the coin 1 as well as the rotating shaft 7.
It is fixed to the upper end of a sled sword 8 which is fixed to the blade and swings back and forth, and is inserted into a groove of a sword holder 9 and fixed from a bolt holder. 11 is a weft injection nozzle (
12 is a twill thread, 13 is a warp thread, 14 is a gate thereof, 15 is a loom, 16 is a woven fabric, and 17 is a loom frame.

The guide holder 6 is divided into a plurality of parts, and an auxiliary nozzle holder 18 is fixed with screws 19 to the end face of each of the guide holders 6 on the side opposite to weft insertion, except for the one closest to the side opposite to twill insertion. An auxiliary nozzle 2 whose main body is pipe-shaped is attached to each holder 18.
0 is positioned between the straight portions 3a of adjacent guides 3 and erected in the direction in which they extend. Each auxiliary nozzle 20G communicates with an introduction pipe 21 separately fixed to the holder 18 through a through hole (not shown) formed inside the holder 18, and this pipe 21 extends forward along the lead holder 9. It also extends downward.

One end of a flexible pipe 22 is connected to the introduction pipe 21, and the other end of this pipe 22 is connected to the outlet side of an on-off valve 24 fixed to a stay 23 stretched between the frames 17. It has been done. The inlet side of the on-off valve 24 is connected to a common pressurized air supply source (not shown). Each on-off valve 24 biases a valve body 25 in the valve closing direction (downward in FIG. 2) by a built-in spring (not shown), and is rotatably attached to a fulcrum pin 26 by the outer end of the valve body 25. The pivoted opening/closing lever 27 is biased to move the cam follower 28 at the tip of the loom 1.
A cam 301 fixed to the rotating shaft 29 makes one revolution per rotation (one reciprocating movement of the mirror 1), and when the high part 30a of the cam 30 comes into contact with the cam follower 28, the opening/closing lever 27
The valve body 25 is pushed in to open the valve.

The high portion 30a of the cam 30 is formed so as to come into contact with the cam follower 28 when the tip of the striped thread 12 reaches the vicinity of the auxiliary nozzle 20. Furthermore, each auxiliary nozzle 2
The upper end of the nozzle 0 is closed and formed into a conical shape with a rounded top, and a nozzle opening 32 is opened in the side wall of the cone.

This nozzle port 32 is provided near the peripheral wall of the guide hole 4 so as to be at the same height as the koji line G of the guide passage 4A and to be oriented toward the axis G at an intersection angle of 8. Therefore, the ejection direction of the nozzle port 32 is N is obliquely intersecting with the axis G of the guide passage 4A and is directed toward the inner surface of the guide hole 4 of the guide element 3, which is on the opposite side of the nozzle opening 32. Incidentally, several guide pieces 3 disposed next to each auxiliary nozzle 20 are provided with arc-shaped notches 33 in the peripheral wall of the guide hole 4 along the ejection direction line N' of the auxiliary nozzle 20. It may be formed as necessary.

In this way, there is no need for the auxiliary nozzle 20 to protrude into the guide passage 4A, and the striped thread 12
This eliminates the possibility of striping defects caused by the wires getting caught. Muscle 1
When the auxiliary nozzles 20 move backward, each inner thread 3 of the guide device 2 that moves together with the warp threads 13 passes through the warp threads 13 and enters the warp closure opening 14. At the same time, each auxiliary nozzle 20 also passes through the warp threads 13 with its top and enters the warp thread opening 14. Enter Sekiguchi 14. Then, from the point at which the guide hole 4 of the guide element 3 no longer intersects with the warp yarn 13, pressurized air is injected into the guide hole 4 from the main nozzle 11, and the weft yarn 12 is placed on this air flow to start injection striping. . Then, just before the tip of the thread 12 reaches each auxiliary nozzle 20, the high portion 30a of the cam 30 comes into contact with the cam follower 28 and pushes the valve body 25 through the opening/closing lever 27.
The on-off valve 24 is opened, and pressurized air is supplied to two auxiliary nozzles through the pipes 22, 21 and the holder 18, and is ejected from the nozzle opening 32 in a determined direction as described above. As a result, the weft yarn 12 is connected to the nozzle opening 3 of each auxiliary nozzle 20.
While being successively blown away by the jet of air from 2, it flies along with it and becomes streaked. When the tip of the striped thread 12 is conveyed by the air ejected from the next auxiliary nozzle 20, each auxiliary nozzle 20 stops contacting the high portion 30a of the cam 30 with the cam follower 28 and closes the opening/closing valve. Since the valve 24 is closed, the ejection of pressurized air from the nozzle port 32 is stopped. When weft insertion is finished, the jetting of pressurized air from the main nozzle 11 and the auxiliary nozzle 20 on the farthest weft insertion side is also stopped, and as the weft 1 continues to move forward, the guide element 3 and the auxiliary nozzle 20
exits the warp opening row 4. At this time, the striped threads 12 are supported by the lower warp threads 13 forming the opening □14, and the guide holes 4
The weft escapes through the weft escape slit 5, and then the weft escapes through the weft escape slit 5.
The cloth 16 is woven by creasing the front 15 of the cloth. Here, the weft insertion state will be explained in detail with reference to FIG. 3.

Incidentally, FIG. 3 shows the results of observing the state of the striped yarn 12 for the one that obtained the most favorable results among the experiments conducted under various conditions as described above in the process leading to the present invention. , the experimental conditions are as follows. Inner cover of guide hole 4 of guide element 3: 7th side Thickness T of guide element 3: 2. Gap C between calf guide 3 and guide 3: 1.6 side auxiliary nozzle 2
Aperture d of the nozzle port 32 on the 0 side: Intersection angle a between the ejection direction line N of the 1 side nozzle port 32 and the axis G of the guide hole 4: 1y Gap between the auxiliary nozzles 20 P: 10 In other words, The weft yarn 12 is approximately aligned with the jet direction line N near the auxiliary nozzle 20.
After being drawn upward, it crosses the Koji line G along the Dan direction line and is further deflected in the direction of the theoretical reflection line R of the ejection direction line N, and when it crosses the axis G again, it immediately deflects to follow the Fuji line G. Become.

Since the light yarn is located at the farthest point of flow velocity (the center of the airflow), this form of the striped yarn 12 indicates the center of the airflow. By the way, the above-mentioned proposal using a tapered guide hole and an auxiliary nozzle (Tokubuta 54-134)
In the device according to No. 242), the theoretical reflection line R' of the jet direction line N is formed in a zigzag shape while gradually reducing its pitch, so it is effective to quickly bring the center of the airflow to the mari line G, but the guide path is It can be inferred from the shape of the reflection line R' that turbulence will occur in the airflow if the cross section of the plane is reduced.

In addition, since the present invention eliminates the taper of the guide hole, the theoretical reflection lines R are gently formed at equal pitches, so a predetermined airflow center can be generated even in a narrow guide passage. The fact that the airflow eventually coincides with the axis G indicates that the airflow is leaking out evenly from around the guide hole.As explained above, the present invention forms a series of guide passages closed in the circumferential direction. In a striping device that is advantageous in terms of air economy, in which striping is performed using the air jetted from the nozzle and the air jetted from the auxiliary nozzle, the guide hole that makes up the guide passage is made straight, which allows it to be used in areas that could not be used in the past. By being able to reduce the diameter of the guide hole, it is possible to achieve even greater air economy, and even if some air leaks out, this leakage will cause the entire yarn to be cut into the guide path as shown in Figure 3. Since it is possible to carry out stable conveyance while keeping the flying resistance at a low value, the number of auxiliary nozzles can be reduced and the amount of auxiliary air can be reduced compared to the conventional second method. Overall, the present invention can further enhance the economic efficiency of the weft insertion method using the closed method.

[Brief explanation of the drawing]

The figure shows an embodiment of the present invention, and FIG. 1 is a front view of a loom;
Fig. 2 is an enlarged cross-sectional view of the row 0 shown in Fig. 1, Fig. 3 is a cross-sectional plan view of the guide device to explain the weft insertion state, and Fig. 4 is a diagram to explain the results of an experiment in the process leading to the present invention. It is. 2... Guide device, 3... Guide element, 4... Guide hole, 4A... Guide passage, 11... Main nozzle, 20... Auxiliary nozzle, 32...Nozzle opening. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. Guide elements with guide holes that are closed except for the slits for weft escape are arranged in the weft insertion direction at predetermined intervals, and a guide passage is formed by the row of guide holes, so that the weft is exposed to the air jetted from the main nozzle. In the device for carrying the weft through the guide passage with air ejected from an auxiliary nozzle, the guide hole is formed into a straight hole, and the cross-sectional area of the guide hole is equivalent to a circle with a diameter of 6 to 12 mm, and the guide hole is Gap of 0
．． 8 to 1.6 mm, and the product of the diameter and the gap is 7 or more.