WO2000061846A1

WO2000061846A1 - Reed for air injection loom and air injection loom

Info

Publication number: WO2000061846A1
Application number: PCT/JP2000/002240
Authority: WO
Inventors: Takatsugu Kato; Chitoshi Miyamukai; Daisaku Goya; Dai Kimura
Original assignee: Takayama Reed Co., Ltd.
Priority date: 1999-04-07
Filing date: 2000-04-06
Publication date: 2000-10-19

Abstract

A reed for air injection loom, comprising a tapered groove portion formed of a divergent part and a convergent part positioned at the center of a guide groove which guides wefts or at a position on an anti-main nozzle side, wherein the divergent portion is a portion where a flow path cross-section disposed on the anti-main nozzle side of a straight groove portion is diversified downward and the convergent portion is a portion where it is disposed on the anti-main nozzle side of the divergent part and air flow from an auxiliary nozzle is converged by gradually narrowing the lower edge of the groove so as to lead the hair flow to the straight groove portion on a downstream side, the auxiliary nozzle is disposed closely to the divergent part, preferably opposedly to the divergent part, whereby the weft transporting force of the auxiliary nozzle is increased so as to remarkably reduce an energy consumption at the time of weaving of the air injection loom.

Description

Description Prop for air jet loom and air jet loom Technical field

The present invention relates to an air jet loom for weft insertion by an air jet and an air jet loom used for an air jet loom, and in particular, a guide groove for guiding the weft insertion air jet by a recess formed in the front edge of the pruner. The present invention relates to an air jet loom provided with an air jet loom and an auxiliary nozzle for urging the air flow in the guide groove, and a air jet loom used in such an air jet loom. Background art

Most air jet looms are equipped with a prize with a guide groove on the front and an auxiliary nozzle. The guide groove is a groove that opens toward the front of the cloth (the cloth fell side), and the air jet that makes the weft fly is blown into the guide groove from one end of the guide groove by the main nozzle. The guide grooves are formed by recesses formed at the leading edges of a number of juxtaposed Prawns.A gap is provided between the Prawns for the warp to pass. Since the front surface is open, the airflow blown into the guide groove is diffused, attenuated, and the weft conveying force decreases as it moves away from the nozzle. Therefore, an auxiliary nozzle is provided for injecting the auxiliary jet flow into the guide groove to recover the weft conveying force of the air flow in the guide groove. Depending on the weaving width, ordinary looms require multiple auxiliary nozzles.

Auxiliary nozzles are provided fixedly on the slabs that support Pro! The tip of the auxiliary nozzle is located slightly below the center of the guide groove so that the tip of the auxiliary nozzle does not interfere with the cloth fell at the time of the provling. When the warp opens, the tip of the auxiliary nozzle separates the warp and is inserted into the warp opening. The tip of the nozzle has a flattened cross-sectional shape so as not to damage the warp as much as possible, and has an auxiliary nozzle hole on the side surface of the tip. Even if the cross section is flattened, the thickness of the tip of the auxiliary nozzle is usually much thicker than the spacing between the yarns, so the yarn where the auxiliary nozzle is inserted is Bend between If the amount of bending is large, nozzle marks (vertical streaks) are formed on the woven fabric, so it is necessary to provide an interval between the tip of the auxiliary nozzle and the front edge of the Proba. Furthermore, the weft in the guide groove may dance and fly out of the front opening, so that it is necessary to avoid such interference between the weft and the auxiliary nozzle.

Due to these various restrictions, the tip of the auxiliary nozzle cannot be very close to the guide groove, and is usually located at a position about 3 mm away from the front edge of the lower jaw that forms the lower surface of the guide groove. The auxiliary nozzle is mounted so that the tip of the auxiliary nozzle is positioned, and the air flow is injected obliquely from that position into the guide groove. Therefore, the air of the auxiliary nozzle is jetted toward the upper rear side of the guide groove, and the weft yarn is mainly conveyed along the upper rear side portion of the guide groove.

The cross-sectional shape of the guide groove is usually constant over the entire width of the Prov., But in a double weaving loom with the main nozzles arranged vertically, the air flow injected from the upper and lower nozzles is guided to one guide groove. For this reason, Prov has been proposed in which the shape of the guide groove at the end of the main nozzle is port-shaped.

In addition, when weaving using a yarn that is easily damaged by bending, it is possible to arrange a Prura that does not have a lower jaw or has an extremely low lower jaw as the Pruriwa at the part facing the auxiliary nozzle. Is being done. This is to reduce the bending angle of the warp yarn at the part where the auxiliary nozzle is inserted by widening the distance between the auxiliary nozzle and the auxiliary nozzle by retreating the leading edge of the auxiliary nozzle at the part facing the auxiliary nozzle. It was intended.

In air jet looms, 50% or more of the energy consumed during weaving is It is consumed to generate compressed air for weft insertion. Approximately 70% of the obtained compressed air is consumed by the auxiliary nozzle, depending on the weaving width of the loom. Air-blowing looms are characterized by high weaving speeds and the ability to weave a wide range of fabrics, including natural fibers such as wool, but the biggest drawback is the large power consumption during weaving. The ratio of the power consumed by the auxiliary nozzle is very large.

Reducing power consumption during weaving is an extremely important issue not only in terms of reducing weaving costs but also in terms of environmental preservation.In an air jet loom, air jets from auxiliary nozzles can be more efficiently used. By using it to transport weft yarns, the amount of energy consumed can be significantly reduced.

In order to efficiently use the air jet from the auxiliary nozzle for conveying the weft, it is desirable to make the jet direction of the auxiliary air flow as close as possible to the flight direction of the weft, but in such a case, after the air is jetted However, the distance before reaching the guide groove becomes longer, and the efficiency is reduced due to the diffusion of air. On the other hand, trying to guide the air jet into the guide groove as short as possible creates a large angle difference between the air jet direction and the weft flight direction. The greater the amount, the lower the transport efficiency.

In order to solve these conflicting problems, it is better to bring the air nozzle of the auxiliary nozzle closer to the center of the guide groove. However, due to the various restrictions described above, the tip of the nozzle must be protruded beyond the conventional positional relationship. It is impossible to get close to the wings. It is not possible to approach the tip of the auxiliary nozzle by increasing the vertical width of the guide groove, reducing the front-rear depth, or removing the lower jaw to form a guide groove that is open downward. This is possible, but this will increase the diffusion of the blast air, and the weft will be conveyed while dancing over a wider area, so the nozzle tip must be separated to avoid interference with the weft. This also has the adverse effect of making it impossible to increase the transfer efficiency of the auxiliary air flow. Disclosure of the invention

The present invention has made it possible to significantly reduce the energy consumption during weaving of an air jet loom by obtaining technical means for further increasing the weft conveying force of the auxiliary air flow under the above-described restrictions. Things.

According to the present invention, a guide groove 5 for guiding a weft yarn and air for conveying the same is provided on the front surface of the prize by providing a recess of a predetermined shape at the front edge of the prize feather constituting the prize of the loom. The guide groove 5 of the prize for an air jet loom of the present invention is intended for an air jet and a prize provided with an auxiliary nozzle for urging the weft conveying air flowing in the guide groove at a predetermined position facing the A tapered groove 8 is provided at the center or on the side opposite to the main nozzle. This tapered groove portion is a flat-shaped or V-shaped groove portion formed in a front view formed by expanding the lower edge of the guide groove downward and then gradually narrowing it upward toward the main nozzle side. Therefore, the tapered groove portion 8 includes an enlarging portion 10 on the main nozzle side where the groove cross section is widened, and a converging portion 11 on the opposite side of the main nozzle side where the groove cross section is gradually reduced.

Figure 1, Figure 8, Figure 9, Figure 9

This is shown in Figures 14 and 19, etc. When the guide groove is sharply engraved and the taper groove & is made to have a typical flat shape as shown in (c), (d) and (e) of Fig. & The effect of increasing the flow velocity of air is great, but the leading end of the weft flying at the part where the groove width increases rapidly is turned downward by negative pressure and contacts the lower edge of the groove, preventing smooth flight. A phenomenon occurs. To avoid this phenomenon, see Figure 8

As shown in Fig. 9 (a) and Fig. 9, the main nozzle side of the taper groove is also inclined in the expanding direction to reduce the pressure change generated at the main nozzle side end of the tapered groove 8. It is valid.

— Insert the tip 14 of the auxiliary nozzle 13 into the groove of the widened part 10 by approaching the tip 14 In such a case, the air flow from the auxiliary nozzle compensates for the negative pressure generated in the expanded portion, so that the tapered groove 8 is formed as shown in FIGS. 8 (c), (d), and (e). It is preferable to adopt a flat shape.

Usually, a plurality of tapered groove portions 8 need to be provided at intervals corresponding to the arrangement intervals of the weft insertion auxiliary nozzles 13 provided on the loom side, depending on the weaving width of the weaving machine. Straight groove portions 9 are provided between adjacent tapered groove portions. The intervals at which the tapered groove portions 8 are provided are equal intervals, intervals that gradually increase or decrease toward the opposite main nozzle side, intervals according to the arrangement of the yarns, and the like. Decide.

It is preferable that the tapered groove portion 8 is formed by arranging the protruding wings, which are formed by individually forming the groove width of the concave portion 4 forming the guide groove by using a large number of dies or by slightly machining, or by machining. A plurality of the prura 3a having a recess 4a having a width H wider than that of the prawn 3b forming the straight groove portion 9 are alternately shifted in the vertical direction, and the deviation amount is reduced by a narrow groove width. Forming by gradually increasing the size in a certain direction is advantageous in terms of cost.

According to the present invention, the auxiliary nozzle 13 and the taper groove 8 are arranged so that the air jet from the auxiliary nozzle flows into the guide groove at the converging portion 11 of the taper groove. In this case, the air jet diffused after being ejected from the nozzle hole of the auxiliary nozzle is guided to the downstream straight groove 9 according to the contraction of the groove cross section of the converging portion 11, thereby minimizing energy loss due to air diffusion. Can be limited. In addition, since the diffused air jet can be converged and guided to the guide groove, the air jet direction of the auxiliary nozzle can be made closer to the weft flight direction, and the weft flight stability can be improved. it can.

In order to guide the air jet diffused upward to the guide groove, it is desirable to increase the amount of protrusion of the upper jaw of the guide groove.However, there is a risk of interference with the tumble pulling the fabric right and left just before weaving. The upper jaw can be too large Absent. According to the present invention, by slightly shifting the direction of the air jet from the auxiliary nozzle downward, it is possible to reduce the proportion of the air jet which diffuses upward and hits the upper jaw, thereby reducing the proportion of air jets such as temples. It is possible to achieve the stability of the weft flight and the reduction of the running cost without causing interference with the members. When viewed as a whole, the guide groove 5 of the present invention includes a taper groove portion 8 and a straight groove portion 9. The straight groove portion 9 is a groove portion having the narrowest groove width with a constant cross-sectional shape. The tapered groove portion 8 is gradually narrowed in width from the expanded portion on the upstream side in the weft flight direction to the straight groove portion on the downstream side by inclining the expanded portion 10 and the lower edge of the groove. It is formed by a converging portion 11 that changes continuously in the direction.

The enlarged portion 11 is disposed downstream of the straight groove portion 9 in the weft flight direction. In other words, a straight groove portion 9 always exists on the main nozzle side of the widened portion 11. The converging portion 11 is disposed downstream of the widening portion 10 in the weft flight direction.

The enlarged portion 11 may be formed by forming a groove portion having the widest groove width by the wing 3a having a wide concave portion 4a on the front edge and having a wide concave portion at the front edge, or a flat feather having no concave portion. 3 f or an inverted L-shaped recess with no lower jaw 4 c with a claw blade having a c, or a groove with the same width as the straight groove and a lower jaw tip facing the auxiliary nozzle The part is formed by the cut-off Pr 3wa 3e.

The converging portion 11 can be formed by alternately arranging the Prova 3a having the recesses 4a having the same groove width by changing the amount of displacement in the vertical direction.

The air jet loom of the present invention includes the Pr 1 having the above configuration and the auxiliary nozzle 13, and the distal end 14 of the auxiliary nozzle faces the expanding portion 10.

The air injection auxiliary nozzle 13 of the present invention can be provided with its tip close to the front surface of the pro. That is, the tip of the auxiliary nozzle is located at a position that partially overlaps the lower jaw tip of the wing of the wing, which forms a straight groove part when viewed from the side of the pri, or at a distance of 1 mm or less from the lower jaw front end of the wing. Can position 1 4 Wear. The upstream end of the converging portion 11 in the weft flight direction has a groove cross section that does not block the nozzle hole of the auxiliary nozzle.

According to the above structure of the air jet loom and the air jet machine, the nozzle hole of the auxiliary nozzle can be made closer to the center of the guide groove. Most of the guide grooves are straight grooves that define the cross section strictly or narrowly, and the part where the groove cross section is loosely defined is the air from the auxiliary nozzle close to the part where the weft flies. Since the current flows, the air flow does not attenuate due to the weft guiding function and diffusion, and therefore, the efficiency of weft conveyance by the air flow can be greatly improved.

Furthermore, since the direction of the auxiliary air flow can be made closer to the flight direction of the weft, the turbulence of the air flow flowing through the guide groove is reduced, the weft dance can be reduced, and the rear of the prize from between the prawns. The amount of air flowing out also decreases. Further, since the angle of backward inclination of the flattened nozzle tip when the auxiliary nozzle is viewed from above is also reduced, the actual thickness of the nozzle tip when inserted between the warp yarns is also reduced. The amount of bending of the warp when approaching the Prov can also be reduced.

For these various reasons, the tip of the auxiliary nozzle is brought as close as possible to the guide groove without increasing the diffusion and attenuation of the air flow flowing in the guide groove, and the direction of the auxiliary air flow is changed by the weft flight. Since it is possible to approach the running direction, the efficiency of weft transfer by the auxiliary air flow is significantly improved, and the energy consumption of the air jet loom during weaving operation can be significantly reduced. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic front view of Prov showing the first embodiment. FIG. 2 is a side view showing two types of prawns used in the first embodiment. FIG. 3 is a front view showing a method of forming a tapered groove portion by vertically shifting a blade having a recess having a wide groove width. FIG. 4 is a sectional view taken along line AA of FIG. FIG. 5 is a side view showing the Proba and the auxiliary nozzle. FIG. 6 is a diagram showing the measured flow velocity of the guide groove. Figure 7 shows that the injection pressure is different. FIG. 6 is a diagram similar to FIG. FIG. 8 is a schematic front view showing another example of the shape of the tapered groove portion. FIG. 9 is a schematic front view showing an example of a flat V-shaped tapered groove portion. FIG. 10 is a side view showing the positional relationship between the concave portion of the Proba and the tip of the auxiliary nozzle of the second embodiment. FIG. 11 is a schematic front view showing the positional relationship between the nozzle and the nozzle according to the second embodiment. FIG. 12 is a side view showing the positional relationship between the guide groove and the tip of the auxiliary nozzle of the third embodiment. FIG. 13 is a side view of a third type of 'Protowa used in the third embodiment. FIG. 14 is a schematic front view of the third embodiment. FIG. 15 is a side view showing another example of the prawns used in place of the prawns of FIG. FIG. 16 is a side view showing the shape of yet another Prawn used in place of the Prawn shown in FIG. FIG. 17 is a schematic plan view showing the relationship between the flat portion of the nozzle tip provided close to the blade and the warp in comparison with the conventional structure. FIG. 18 is a side view showing the relationship between the auxiliary nozzle of the fourth embodiment and the prawns facing the auxiliary nozzle. FIG. 19 is a schematic front view of Prov of the fourth embodiment. FIG. 20 is a side view showing an example in which a gap is provided between the tip of the auxiliary nozzle and the front surface of the proof. FIG. 21 is a side view showing the relationship between the guide groove Pro of a trapezoidal cross section and the auxiliary nozzle approaching the guide groove.

Reference numerals 1 in the figure are 1 for Prov, 3 for Prov, 4 for the recess at the front edge of Prov, 5 for the guide groove, 7 for the lower jaw of the guide groove, 8 for the taper groove, 9 for the straight groove, 1 0 is the enlarging portion, 11 is the converging portion, 13 is the auxiliary nozzle, and 14 is the tip of the auxiliary nozzle. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a front view schematically showing a first embodiment of the present invention.笾 1 is formed by a number of vertical wings, whose upper and lower ends are fixed to the upper and lower channels 2, and the weft is carried by a recess 4 as shown in Fig. 2 provided on the front of each wing. Guide grooves 5 for guiding the air flow to be sent are formed. Normally, upper and lower jaws 6 and 7 are formed slightly above and below the concave part 4 of Protoba.

In the case of Proba shown in Fig. 1, a taper groove is formed between the middle of the guide groove 5 and the side opposite to the main nozzle. Minute 8 is formed. The other part of the guide groove is a straight groove part 9 whose upper edge and lower edge are parallel. The taper groove portion 8 has the same upper edge and groove depth as the straight groove portion, and has a sloped lower edge that becomes suddenly wider on the main nozzle side and gradually narrows toward the end of the main nozzle. The end of the inclined lower edge opposite to the main nozzle is connected to the lower edge of the straight groove portion 9 without any step. The maximum groove width of the taper groove portion 8 is about twice the groove width of the straight groove portion 9, and a step Y where the groove width sharply increases at the nozzle side end of the taper groove portion 8 Are formed.

The tapered groove portion 8 can be formed by alternately displacing and vertically displacing the Provula feathers having a recess having a width H corresponding to the maximum groove width at the front edge of the Proba feathers. In other words, the upper and lower edges of the guide grooves are fixed to the upper and lower channels 2 by displacing the upper and lower positions of the adjacent proviso such that the upper and lower edges of the guide groove are defined by every other proviso. The groove width of the guide groove formed by a pair of adjacent prize blades is smaller than the width H of the recess provided in each prize blade by the amount of vertical displacement of the adjacent prize blade. Accordingly, by gradually increasing the displacement amount of the adjacent prize blade toward the non-main nozzle side, the groove width of the guide groove 5 can be gradually narrowed toward the non-main nozzle side. it can. Of course, the taper groove portion 8 can also be formed by arranging the ridges provided with recesses having slightly different groove widths. However, according to the structure of FIG. 3 described above, the taper groove portion 8 can be formed at a lower cost. It is characterized in that it can be formed, and the length of the tapered groove portion 8 and the shape of the lower edge when the proof is viewed from the front can be freely changed.

FIGS. 1, 3 and 4 show the position of the main nozzle 12 and the position of the auxiliary nozzle 13 with respect to Prov 1. The auxiliary nozzle 13 is preferably provided slightly closer to the main nozzle than the nozzle-side end 10 of the taper groove ^^, as shown in the experimental results described later, in that the air jet can be effectively used. On the other hand, when the auxiliary nozzle 13 is provided inside the tapered groove portion 8 (the position indicated by C in FIGS. 1 and 4), the passage position of the prappa that restrains the warp of the warp from side to side is determined by the groove depth. Only separates from the auxiliary nozzle, so that the air jet can be used efficiently and the auxiliary nozzle can be smoothly inserted into and removed from the yarn. Become so.

Figures 6 and 7 show the measurement results of a change in the flow velocity of air in the guide groove due to the air jet of the auxiliary nozzle when the injection air pressure was 5 kgf / sq cm and 4 kgf / sq cm. FIG. The line in each graph indicates the increase in the air flow velocity when the auxiliary air flow is injected toward the straight groove portion, and the line port indicates the position of the auxiliary nozzle using the proof of the present invention at the position of the nozzle side end of the tapered groove portion ( The increase in the air flow velocity in the guide groove when it is arranged at the position (B in FIGS. 1 and 4) indicates that the auxiliary nozzle uses the Prova blade of the present invention to connect the auxiliary nozzle to the nozzle end 1 FIGS. 5A and 5B respectively show an increase in the air flow velocity in the guide groove when the air is injected at a position 5 to 15 mm upstream from 0 (position A in FIGS. 1 and 4).

As shown in the figure, the provision of the tapered groove portion 8 increases the airflow in the guide groove 5, and in particular, makes the auxiliary nozzle slightly more than the nozzle side end 10 of the tapered groove portion 8. When installed near the main nozzle, the effect of increasing the speed of the air jet is large.

As can be seen from the test results, by using the pro of the present invention, the air jet jetted from the auxiliary nozzle 13 can be used more efficiently for the weft flight, and the running cost of the air jet cotton machine can be improved. In addition to lowering the height of the weft yarn, it is possible to reduce the loss due to the diffusion of the air jet from the auxiliary nozzle, so that the direction of the jet air can be made closer to the flight direction of the weft to improve the flight stability of the weft. It has the effect of being able to do it.

8 and 9 are views showing another embodiment of the shape of the tapered groove portion 8. FIG. Fig. 8 (a) shows the shape of the main nozzle side with a portion where the groove width expands in an arc shape. Fig. 8 (b) shows the shape where the lower edge smoothly connects concave and convex curved surfaces. c) is the shape where the lower edge smoothly connects a straight line and a convex surface, (d) is the shape of the convex curved surface with the lower edge being an arc, and (e) is the step perpendicular to the main nozzle side end. It is a shape having. Fig. 9 is a diagram showing an example of a tapered groove portion having a flat V-shape in a front view.Fig. 9 (a) shows the length L1 of the main nozzle side portion and the length of the main nozzle side portion. Length L 2 Fig. (B) shows the length of the main nozzle side and the opposite side of the main nozzle side, and Fig. (C) shows the length of the main nozzle side. This is an example of an asymmetric V-shape in which the length L2 longer than L1 on the side opposite the main nozzle is longer.

The shape on the main nozzle side of the taper groove portion 8 is a typical flat shape where the groove width is expanded by a vertical step at the main nozzle side end as shown in Fig. _8_T (c) and (d). Various shapes are possible, from a square shape to a shape with a gentler skew than the part opposite to the main nozzle, as shown in Fig. 9 (c). Various shapes are possible, such as a linear shape, an arc-shaped shape, and a shape bent into irregularities. According to the results of tests conducted by the inventors of the present application on tapered groove portions of various shapes, the shape in which the groove width rapidly expands on the main nozzle side portion increases the flow velocity of the conveying air in the guide groove. The effect is great. On the other hand, if the groove width changes abruptly, a large turbulence will occur due to negative pressure in the area where the groove width is widened, and the leading end of the flying weft, especially when a thin or flexible weft is used. Is turned downward and contacts the lower edge of the groove, causing a phenomenon that hinders smooth flight. Therefore, although it differs practically depending on the weft used, as shown in Fig. 1, Fig. 8 (a) and Fig. 9 (a), the anti-main nozzle A shape having a steeper inclination in the expanding direction than the side portion is preferable.

In the first embodiment shown in FIGS. 1 to 5, the tip 14 of the auxiliary nozzle is arranged at a position farther from the tip of the lower jaw 7 of the wing, but the positional relationship between the proto and the auxiliary nozzle is changed. When the positional relationship shown in FIG. 1 by reference numeral 13 (c) or FIG. 11 is adopted, the tip 14 of the auxiliary nozzle can be located in the guide groove 5. FIGS. 10 and 11 are views showing a second embodiment of the present invention, and FIG. 11 is a front view schematically showing a proof 1, a main nozzle 12, and an auxiliary nozzle 13. FIG.

A guide groove 5 is formed on the front surface of the proof 1 so that the groove width at the portion facing the auxiliary nozzle 13 is widened downward. The straight groove portion 9 with a narrow groove width where the groove width does not change has a narrow U-shaped recess 4b with a narrow vertical width at the center of the front edge shown in Fig. 2 (b). It is formed by juxtaposing prawns. The enlarging portion 10 facing the auxiliary nozzle 13 has a concave portion 4a in which the width of the concave portion in FIG. 2 (b) is expanded downward, and a plurality of pruri feathers shown in FIG. 2 (a) are juxtaposed. It is formed by doing. The converging portion 11 whose shape is such that the groove width gradually narrows toward the downstream in the weft flight direction is arranged by alternately displacing the prawns shown in Fig. 2 (a) up and down, and the amount of the shift is reduced in the downstream direction in the weft flight direction. It is formed by increasing the size toward the side (see Fig. 3).

The auxiliary nozzle 13 is opposed to the widened portion 10, and its tip 14 has a straight groove portion 9, as shown in FIG. It is arranged close to the position where it overlaps with the lower jaw 7 of the recess 4b of the wing.

That is, the tip 14 of the auxiliary nozzle has a positional relationship of being inserted into the guide groove 5 in the expanded portion 10 where the guide groove has the widest groove width. An upstream portion of the guide groove into which the tip 14 of the auxiliary nozzle is inserted has a straight groove portion 9 having a narrow groove width, and the tip of the auxiliary nozzle cannot be seen from the airflow flowing therethrough. Therefore, the weft flowing in the straight groove portion and the air flow for transporting the same flow to the converging portion 11 without being disturbed by the tip of the auxiliary nozzle inserted in the guide groove.

The air flow ejected from the nozzle hole of the auxiliary nozzle is directed to the inlet of the straight groove portion 9 on the downstream side of the widening portion 10, and therefore, the space below the converging portion has a higher speed than the weft. The airflow from the auxiliary nozzle is flowing, and the airflow flowing from the upstream side is not diffused at the expansion section 10 but rather is accelerated by the auxiliary airflow below and converges while accelerating. The air is guided to the straight groove portion 9 that is continuous downstream of 11, and the airplane continues to travel on the carrier air urged by the airflow from the auxiliary nozzle.

A widening portion with a wider groove width, a converging portion connected to the downstream side thereof, and a straight rim portion further connected to the downstream side are provided for each auxiliary nozzle.

FIGS. 12 to 14 show the proofs of the third embodiment. In this example, the lower jaw is shown. The expanded portion 10 is formed by juxtaposing a plurality of Prova feathers 3C (FIG. 13) having L-shaped recesses 4c that do not have them. The straight groove portion 9 and the gathering portion 11 are formed by the same structure using the same wings as in the second embodiment.

In the third embodiment, since the front edge of the prawn at the portion facing the auxiliary nozzle 13 is cut down to the lower side, the guide is provided with the auxiliary nozzle 13 standing up from that of the second embodiment. It can be inserted into the groove 5 and the warp bend between the leading edge of the prawn and the auxiliary nozzle is reduced, so the tip 14 of the auxiliary nozzle must be inserted deeper into the guide groove 5. (See Figure 12).

In the case of the second embodiment, two types of prawns having a substantially U-shaped concave portion having different vertical widths in the center of the front edge are used. On the other hand, in the third embodiment, in addition to the above two types of Proba, a Proba provided with an inverted L-shaped recess 6c is used. As shown in Fig. 15, instead of the third Pr 箴 wa 3c, a Pr 箴 wa 3d with a lower jaw 7 below the concave part 6 with a wider top and bottom, and Fig. 16 Flat wings having no recesses as shown in (1) can also be used.

Since the groove length of the enclosing portion 10 is short, the reduction of the weft transfer efficiency due to the loosening of the groove cross-section is small, so from the viewpoint of the shape of the guide groove, the tip of the auxiliary nozzle It should be determined in consideration of the accessibility to the prize.

In this way, the airflow ejected from the tip of the auxiliary nozzle arranged close to the guide groove 5 has a small angle difference with the weft flight direction when the prize is viewed from above, and is efficient. Weft transfer is possible. Furthermore, since the flat portion at the tip of the auxiliary nozzle has an angle close to the direction of the warp, the thickness at the time when the tip of the auxiliary nozzle separates the yarn becomes smaller, and the bending angle of the warp at the portion where the auxiliary nozzle is inserted Can be reduced. FIG. 17 (a) shows the case of the present invention, and FIG. 17 (b) shows the conventional state.

In the illustrated embodiment, the convergence portion is alternately shifted up and down by the protruding wings having the recesses having a wide vertical width to form a guide groove portion in which the groove width changes continuously. Of course, it is also possible to form by arranging the wings of the dents with the top and bottom widths of the dents slightly changed, which is more preferable in terms of the function of guiding the air flow, but increases the manufacturing cost .

FIGS. 18 and 19 are views showing a fourth embodiment of the present invention. FIG. 18 is a side view showing the relationship between the protruding blade 3 e forming the enlarged portion 10 and the tip of the auxiliary nozzle 13. Fig. 19 is a schematic front view of (1).

In the fourth embodiment, as the shape of the protruding blade 3 e formed on the enlarging portion 10 opposed to the auxiliary nozzle 13, the shape of the protruding blade 3 b forming the straight groove portion 9 ((b in FIG. 2) )) By cutting off the front end of the lower jaw 7 so that the required gap S 1 (usually around 3 mm) between the front of the wing and the tip of the auxiliary nozzle 13 is separated. The tip of the auxiliary nozzle 13 is approaching the guide groove 5. The difference between the fourth embodiment and the second and third embodiments is that the vertical groove width of the guide groove at the portion facing the auxiliary nozzle 13 is the same as the groove width of the straight groove portion 9. There is a point.

The feature of the fourth embodiment is that the rigidity of the prawn at the portion facing the auxiliary nozzle 13 can be made larger than that of the third embodiment. Further, on the back side of the guide groove 5, the groove width is defined to be the same narrow as that of the straight groove portion, so that the diffusion of the airflow due to the increase in the groove width can be further reduced.

From the viewpoint of making the direction of the auxiliary air flow as close as possible to the direction of the main air flow, the tip of the auxiliary nozzle 13 should be as close to the center of the guide groove 5 as possible. It is preferable that the tip of the auxiliary nozzle is brought close to the position where the lower jaw of the prawn and the tip of the auxiliary nozzle overlap.

However, in some cases, as shown in FIG. 20, there is a gap between the front end of the lower jaw of Proba and the tip of the auxiliary nozzle 13 that forms the straight groove portion 9 when viewed from the side of Prov. Auxiliary nozzles can be brought closer to this extent. In the conventional type of Prov, it was difficult to reduce the gap between the leading edge of the Prov feather and the auxiliary nozzle to 3 mm or less due to the large amount of warp bending, but in the loom of the present invention, Front and auxiliary The tip of the nozzle can be made closer, and if the gap S2 is made close to about 1 mm, the effect of the present invention will be exhibited.

Also, when the tip of the auxiliary nozzle 13 is viewed from the side of the pr and approached to the part that overlaps with the lower jaw 7 of the prura 3b that forms the straight groove portion 9, as shown in Fig. 21, The air flow in the guide groove 5 can be further reduced by using a prize having a guide groove 5 with a trapezoidal cross section in which the vertical width of the groove is smaller than the vertical width of the back side o

As shown in Fig. 21, Prov has a guide groove with a trapezoidal cross section with an expanded back side, which has been proposed for use with a small lead stroke. In the loom having the structure, there is a problem that the airflow of the auxiliary nozzle becomes difficult to flow into the guide groove 5, and the weft guiding function of the guide groove 5 is rather deteriorated. However, according to the structure in which the tip of the auxiliary nozzle 13 is brought close to the center of the guide groove 5 by utilizing the present invention, the air flow of the auxiliary nozzle is efficiently distributed in the guide groove having a trapezoidal cross section having a wide rear side. The weft can be guided well, and the weft can be guided more efficiently with a small amount of air. Industrial applicability

According to the present invention, the nozzle hole of the auxiliary nozzle can be brought close to the guide groove to a position that was impossible with conventional means. As a result, the direction of the auxiliary air flow can be made closer to the flight direction of the weft, so that the turbulence of the air flow flowing in the guide groove is reduced, the weft dance can be reduced, and the space between the Prov The amount of air flowing out behind the vehicle also decreases.

Most of the guide grooves are straight grooves, and the air flow from the auxiliary nozzle flows into the tapered groove where the groove cross section is loosely regulated, so that the weft guide function and attenuation of air flow due to diffusion Therefore, energy consumption during weaving of the air jet ■ can be greatly reduced. Further, since the angle of inclination of the flattened nozzle tip when the auxiliary nozzle is viewed from above is also reduced, the bending amount of the warp when inserted between the warps can be reduced.

Claims

The scope of the claims

1. In a raft for an air jet loom in which a guide groove (5) for guiding weft yarn and its conveying air is formed on the front surface of the prize by a set of recesses provided on the front edge of the prawn, ) Is provided with one or a plurality of tapered groove portions (8) in the center or in a region on the side opposite to the main nozzle, and the tapered groove portion has a lower edge extending downward and counterclockwise in the main nozzle side portion. Prototype for air jet loom, which is a flat-shaped or flat V-shaped groove in front view formed by gradually narrowing the lower edge upward at the main nozzle side.

2. The tapered groove portion (8) is formed by making the length of the main nozzle side portion shorter than the length of the non-main nozzle side portion. The air jet loom according to claim 1, characterized in that:

3. Equipped with a plurality of tapered groove portions (8), a straight groove portion (9) in which the groove width does not change between adjacent taper groove portions, and the plurality of taper groove portions of the bracket are on the loom side. 3. The air jet loom according to claim 1, wherein the weft insertion auxiliary nozzles are provided at intervals corresponding to an arrangement interval of the weft insertion auxiliary nozzles.

4. The taper groove portion (8) has a recess (4) with a groove width (H) wider than that of the prawn forming the straight groove portion (9). Claims 1, 2, or 3 characterized by being formed by disposing them alternately and displacing them, and gradually increasing the amount of displacement in the direction in which the groove width decreases. Proof for air jet loom according to item 3.

5. A pulver for an air jet loom in which a guide groove (5) for guiding a weft yarn and its conveying air is formed on the front surface of 笾 by a set of recesses provided on the front edge of Pruriha. Is a straight groove portion having the narrowest groove width with a constant cross-sectional shape (9), an enlarging portion (10) having the widest groove width with the groove width expanded downward, and a lower edge of the groove being inclined. The converging section (11) continuously changes in the direction in which the groove width gradually decreases from the enclosing section on the upstream side in the weft flight direction to the straight groove section on the downstream side, and the expanding section is straight. Provision for an air jet loom, which is located downstream of the groove in the weft flight direction and the converging section is located downstream of the enclosing section in the weft flight direction.

6. A guide for an air jet loom in which a guide groove (5) for guiding a weft yarn and its conveying air is formed on the front surface of the prize by a set of recesses provided on a front edge of the prize feather. Has a straight groove portion (9) having the narrowest groove width with a constant cross-sectional shape, and a flat blade (3 f) having no recess or an inverted L-shaped recess (4 c) having no lower jaw. By inclining the groove (10) formed in 3c) and the lower edge of the groove, the groove width gradually narrows from the expanded part on the upstream side in the weft flight direction to the straight groove part on the downstream side. A converging portion (11) that changes continuously in the direction, the expanding portion is disposed downstream of the straight groove portion in the weft flight direction, and the converging portion is disposed downstream of the expanding portion in the weft flight direction. Has a proof for air jet loom.

7. An air-jet loom drum in which a guide groove (5) for guiding weft yarn and its conveying air is formed on the front surface of 葳 by a set of recesses provided on the front edge of Pr 羽 wa. The straight groove part (9), which has the narrowest groove width with a constant cross-sectional shape, and the part of the lower jaw tip that has the same groove width as the straight groove part and faces the auxiliary nozzle is cut off The widening part (10) formed by the Proba (3e) and the straight groove on the downstream side from the widening part on the upstream side in the weft flight direction by inclining the lower edge of the groove. A converging portion (Π) that continuously changes in the direction in which the groove width gradually narrows to the portion is provided. The expanding portion is disposed downstream of the straight groove portion in the weft flight direction, and the converging portion is expanded. The prize for the air jet loom, which is located downstream of the section in the weft flight direction.

8. The convergence portion (11) is characterized by being formed by alternately arranging Prova (3a) having recesses (4a) having the same groove width by changing the amount of vertical displacement. A proof for an air jet loom according to claim 5, claim 6, or claim 7.

9. A guide groove (5) for guiding the weft yarn and its conveying air is formed on the front surface of the prize by a set of recesses provided on the front edge of the prawn, and toward the guide groove. In the air jet having an auxiliary nozzle (13) for jetting an auxiliary air flow), the guide groove has a straight groove portion (9) having a narrowest groove width with a constant cross-sectional shape, and a groove width. The widening section (10), which has the widest groove width widened downward, and the lower green section of the groove is inclined to increase the groove width from the upstream widening section in the weft flight direction to the straight groove section downstream. A converging portion (11) that changes continuously in a gradually narrowing direction, the expanding portion is disposed downstream of the straight groove portion in the weft flight direction, and the converging portion is located downstream of the expanding portion in the weft flight direction. An air-jet loom, which is disposed on a side of the air-jet loom and has a widened portion (11) facing a tip (14) of an auxiliary nozzle.

10. A guide groove (5) for guiding the weft yarn and its conveying air is formed on the front face of the blade by a set of recesses provided on the front edge of the blade. In an air jet loom having an auxiliary nozzle (13) for jetting an auxiliary air flow, the guide groove has a straight groove portion (9) having a narrowest groove width having a constant cross-sectional shape, and a concave portion. Weft yarn by inclining the enclosing part (10) formed by flat feathers (3f) without the lower jaw (3f) or by protruding feathers (3c) without the lower jaw (4c) How to fly When the groove width gradually narrows from the enlarging part on the improvement flow side to the straight groove part on the downstream side And a converging portion (11) that continuously changes in the direction. The expanding portion is disposed downstream of the straight groove in the weft flight direction, and the converging portion is disposed downstream of the expanding portion in the weft flight direction. Air injection TO with the enlarging part (11) facing the tip (14) of the auxiliary nozzle.

1 1. A guide groove (5) for guiding the weft yarn and its conveying air is formed on the front of the prize by a set of recesses in the front edge of the prawn. An air nozzle having an auxiliary nozzle (13) for injecting an auxiliary air flow, wherein the guide groove has a straight groove portion (9) having a narrowest groove width having a constant cross-sectional shape; Increasing the lower part of the groove with the widening part (10) formed by the wing of the lower jaw (3e) with the same groove width as that of the groove part and the lower jaw tip facing the auxiliary nozzle cut off And a converging portion (11) that continuously changes in the direction in which the groove width gradually decreases from the upstream expanding portion on the weft flight direction to the straight groove portion on the downstream side, and the expanding portion is a straight groove portion. The convergence section is located downstream of the enclosing section in the weft flight direction. An air jet loom, wherein the widening portion (11) faces the tip (14) of the auxiliary nozzle.

1 2. The tip of the auxiliary nozzle (14) is located at a position that overlaps the lower jaw tip of the Protowa group, which forms a straight groove when viewed from the side of 葳, or that is separated by a gap of 1 mm or less from the lower jaw tip. The ninth or tenth aspect of the present invention, wherein the upstream end of the tapered groove portion (11) in the weft flight direction has a groove cross section that does not block the nozzle hole of the auxiliary nozzle. Item 11. The air jet loom according to item 11.