CN102409469B - Weft insertion apparatus in jet loom - Google Patents

Abstract

The invention provides a weft insertion device in a jet loom, wherein the weft insertion device comprises an auxiliary nozzle (21) for weft insertion with a spray hole (23) from which an air jet is injected to convey the weft thread guide channel ( 14) in the weft (Y). The injection hole (23) is tapered so that the cross-sectional area of the hole (23) decreases toward the air injection direction of the auxiliary nozzle (21). The ratio (A) of the taper angle (γ) of the injection hole (23) to the machining deflection angle (β) of the injection hole (23), γ/β=A, has a relationship expressed by the inequality (1): A≥A0 ...(1), where A0 is the variation range (△δmax ) becomes the value of γ/β when 0.

Description

Weft insertion device in jet loom

technical field

The present invention relates to a weft insertion device in a jet loom, wherein the weft insertion device includes an auxiliary nozzle for weft insertion having a spray hole from which air is sprayed to convey weft yarn in a weft yarn guide passage. the

Background technique

The injection hole 111 of the auxiliary nozzle 11 for weft insertion of the type shown in Figure 9 (a), Figure 9 (b) and Figure 9 (c) is directed to the weft guide channel 14, and the weft guide channel 14 is formed by the reed formed on the deformed reed 12. An array of weft guide holes 131 in the teeth 13 is formed. The injection timing at the auxiliary nozzle 11 is matched to the passage timing of the weft thread Y passing in the weft thread guide channel 14 . The weft yarn Y in the weft yarn guide passage 14 is delivered to the weft insertion end by the air jet action from the jet hole 111 . Reference sign T is a warp thread. the

The internal pressure of the air to be injected from the injection hole 111 in the nozzle (ie, the air pressure inside the auxiliary nozzle 11 ) changes as shown by the waveform Np in the graph of FIG. 3 . the

In the auxiliary nozzle for weft insertion disclosed in Japanese Laid-Open Patent Publication No. 3-97939, as shown in the spray hole 111 of Fig. 9(c), the nozzle hole (spray hole) is tapered so that the hole The cross-sectional area decreases toward the direction of the air jet. the

The inventors of the present application conducted an experiment so that the relationship between the apex angle θ and the machining deflection angle ψ in the tapered injection hole 111 disclosed in Japanese Laid-Open Patent Publication No. 3-97939 is expressed as θ/ In the case of 2=1.3×ψ, observe the change of the jet deflection angle δ when changing the internal pressure of the nozzle. As shown in Fig. 9(c), the machining deflection angle ψ is the angle between the weft insertion direction Lo and the axis of the spray hole 111 when viewed along the extension direction of the deformed reed 12, and the spray deflection angle δ is the angle between The angle between the weft insertion direction Lo and the air jet direction line C viewed in the extending direction of the reed 12. The air injection direction line C is a line indicating the direction in which the injection pressure is the largest in the air injection. The air injection direction line C does not coincide with the axis 112 of the injection hole 111 . As described below, the direction C of the air injection or the injection deflection angle δ varies according to the internal pressure of the nozzle. the

To measure the air jet direction line C, for example, a measuring device for measuring the air jet direction disclosed in Japanese Laid-Open Patent Publication No. 9-176937 is used. the

Fig. 10 is a graph showing experimental results. The abscissa in FIG. 10 represents the internal pressure of the nozzle, and the ordinate represents the change Δδ of the injection deflection angle δ. The axis 112 of the frustoconical-shaped injection hole 111 is the axis of a cone having an apex angle θ formed by extending the generatrix (side line) of the truncated cone. In the graph of FIG. 10 , the jet deflection angle δ when the internal pressure of the nozzle is Pmax is expressed as 0° on the ordinate. The curve Δδ represents the variation of the injection deflection angle δ with respect to the variation of the nozzle internal pressure, that is, how the injection deflection angle δ varies based on Pmax when the nozzle internal pressure decreases from Pmax. As apparent from the curve Δδ, when the nozzle internal pressure is the minimum pressure Pmin for weft insertion, the jet deflection angle δ varies in the negative direction (ie, the direction in which the air jet moves away from the reed). the

The minimum pressure Pmin for weft insertion refers to the minimum pressure required for the air jet from the auxiliary nozzle 11 to reach the weft guide channel 14 in such a manner that the air jet direction line C in the air jet can be defined. At pressures lower than the minimum pressure Pmin, the air jet from the auxiliary nozzle 11 spreads out before reaching the weft thread guide channel 14, so that effective traction on the weft thread Y cannot be provided. the

According to the graph of FIG. 10, when the nozzle internal pressure drops from the maximum pressure Pmax to the minimum pressure Pmin, the injection deflection angle δ changes in the negative direction. Therefore, the air jet direction line C is more likely to deviate upward from the weft guide passage 14 . When the maximum pressure Pmax of the nozzle internal pressure (or the pressure of the air tank supplying air to the auxiliary nozzle 11 ) is set low to reduce air consumption, the pulling force of the auxiliary nozzle 11 is reduced. Therefore, when the air injection from the auxiliary nozzle 11 is completed after the end of the weft yarn Y passes through the auxiliary nozzle 11, the negative influence of the change Δδ of the injection deflection angle δ on the passing position of the weft yarn Y becomes significant. the

Contents of the invention

The object of the present invention is to provide an auxiliary nozzle for weft insertion that ensures that the direction of the air injection is maintained at in the weft guide channel. the

According to one aspect of the present invention, a weft insertion device in a jet loom is provided. The weft insertion device includes an auxiliary nozzle 21 for weft insertion having an injection hole 23 from which air is injected to convey the weft yarn Y in the weft yarn guide passage 14 . The injection hole 23 is tapered so that the cross-sectional area of the hole 23 decreases toward the air injection direction of the auxiliary nozzle 21 . The ratio A of the taper angle γ of the injection hole 23 to the processing deflection angle β of the injection hole 23, γ/β=A, has a relationship expressed by the inequality (1):

A≥A0 ... (1)

where A0 is γ when the range of change (Δδmax) of the jet deflection angle (δ) becomes 0 when the jet pressure of the auxiliary nozzle 21 changes from the maximum pressure for weft insertion (Pmax) to the minimum pressure for weft insertion (Pmin). /β value.

In one embodiment, ratio A is 2.5 or greater. the

In another embodiment, ratio A is 3 or greater. the

In yet another embodiment, Ratio A is 4.5 or less. the

In yet another embodiment, the injection holes are frusto-conical in shape. the

As used herein, the maximum pressure for weft insertion refers to the maximum value of the internal pressure of the nozzle. the

The minimum pressure for weft insertion is the minimum pressure required for the air jet from the auxiliary nozzle to reach the weft guide channel in such a way that the direction of the air jet in the air jet can be defined. the

The taper angle γ is defined as the angle between the generatrix of the injection hole and the axis of the injection hole. the

Description of drawings

Figure 1 (a) is a front view showing a part of the auxiliary nozzle for weft insertion and a part of the deformed reed according to an embodiment of the present invention;

Fig. 1(b) is a sectional view of Fig. 1(a) taken along line 1b-1b;

Figure 2(a) is a partial side view of the auxiliary nozzle;

Figure 2(b) is a cross-sectional view of Figure 2(a) taken along line 2b-2b;

Figure 2(c) is a cross-sectional view of Figure 2(b) taken along line 2c-2c;

Fig. 3 is a graph showing changes in pressure inside a nozzle;

Fig. 4 is a graph showing the relationship between nozzle internal pressure and changes in jet elevation angle;

Fig. 5 is a graph showing the relationship between the nozzle internal pressure and the variation of the jet deflection angle;

Fig. 6 is a graph showing the relationship between the ratio A and the variation range of the jet elevation angle;

Fig. 7 is a graph showing the relationship between the ratio A and the variation range of the injection deflection angle;

Fig. 8(a) is a partial sectional view showing a part of the auxiliary nozzle for weft insertion and a part of the deformed reed;

Figure 8(b) is a graph of intersection points on an imaginary plane;

Figure 9(a) is a side view of the weft insertion device;

Figure 9(b) is a partial side view of Figure 9(a);

Figure 9(c) is a cross-sectional view of Figure 9(b) taken along line 9c-9c; and

Fig. 10 is a graph showing changes in the injection deflection angle when the ratio A is 1.3.

Detailed ways

An embodiment of the present invention will be described with reference to FIGS. 1 to 8 . The overall structure of the weft insertion device including the auxiliary nozzle for weft insertion is the same as that in FIG. 9 . the

FIG. 1( a ) is a front view of a part of the auxiliary nozzle 21 for weft insertion and a part of the deformed reed 12 . Fig. 1(b) is a sectional view of Fig. 1(a) taken along line 1b-1b. FIG. 2( a ) is a side view of the tip of the auxiliary nozzle 21 . The tip of the auxiliary nozzle 21 is rounded or arcuate when viewed along the weft insertion direction Lo. Fig. 2(b) is a cross-sectional view of Fig. 2(a) taken along line 2b-2b. Figure 2(c) is a cross-sectional view of Figure 2(b) taken along line 2c-2c. the

A single auxiliary nozzle 21 is provided in the figure. However, as the person skilled in the art realizes, each auxiliary nozzle 21 may be positioned for every certain number of reed teeth 13 in a weft thread arrangement. the

As shown in FIG. 2( b ), the auxiliary nozzle 21 for weft insertion is tubular and the tip of the auxiliary nozzle 21 is closed. The tip portion of the auxiliary nozzle 21 becomes smaller so that the width of the auxiliary nozzle 21 becomes smaller upward in the weft insertion direction Lo. A plate-shaped flat portion 22 is formed at the tip of the auxiliary nozzle 21 . The outer surface 221 of the flat portion 22 faces slightly upward to face the weft insertion direction Lo. The outer surface 221 is parallel to the direction in which each warp yarn T extends. the

As shown in FIGS. 2( b ) and 2 ( c ), the flat portion 22 includes spray holes 23 communicating with the air supply passage 211 in the auxiliary nozzle 21 . The injection opening 23 is conically shaped, wherein the cross-sectional area of the opening decreases in the direction of the air injection. That is, the injection hole 23 is a frustoconical hole. The cone is formed by extending the generatrix (side line) of the truncated cone of the injection hole 23, and the axis 231 of the cone (or the injection hole 23) is inclined with respect to the reference line L1 which is perpendicular to the axis 212 of the tubular auxiliary nozzle 21 . the

As shown in Fig. 2(b), the angle between the reference line L1 and the axis 231 is defined as the The processing elevation angle α. Axis 231 is directed slightly upwards. The injection direction of the air actually injected from the injection hole 23 does not coincide with the axis 231 . Therefore, the injection elevation angle ε does not coincide with the machining elevation angle α. the

As shown in FIG. 2( c ), the machining deflection angle β is defined as the angle between the weft insertion direction Lo (the direction from left to right in the drawing, such as along the weft insertion direction in FIG. 9 ) and the axis 231 . Similar to the relationship between the machining elevation angle α and the jet elevation angle ε, the jet deflection angle δ does not coincide with the machining deviation angle β. the

The taper angle of the cone formed by extending the generatrix (side line) of the truncated cone of the injection hole 23 is defined as the angle γ between the generatrix of the cone and the axis 231 . the

In this embodiment, the ratio A, ie, the value of γ/β is set to 3.6. A curve E0 in the graph of FIG. 4 represents a change Δε of the injection elevation angle ε with respect to a change in the pressure inside the nozzle when the ratio A is 3.6. As shown in Fig. 2(b), the jet elevation angle ε is the angle between the air jet direction line C and the reference line L1 when viewed along the weft insertion direction Lo. To measure the air jetting direction line C, for example, a measuring device for measuring the air jetting direction as disclosed in Japanese Laid-Open Patent Publication No. 9-176937 is used. the

Curve E1 represents the change Δε of the injection elevation angle ε with respect to the change in the pressure inside the nozzle when the ratio A is 1.3. The abscissa indicates the pressure inside the nozzle, and the ordinate indicates the change Δε of the jet elevation angle ε. In this graph, the injection elevation angle at the nozzle internal pressure Pmax is represented as 0° on the ordinate. A positive change of the injection elevation angle ε Δε>0 is a case where the injection elevation angle is directed more upward than the air injection direction line C when the nozzle internal pressure is the maximum pressure Pmax. the

As is apparent from the comparison between the curve E0 and the curve E1, the positive change Δε>0 of the injection elevation angle ε is smaller when the ratio A is 3.6 than when the ratio A is 1.3. That is, the range in which the air injection direction line C changes upward from the case where the nozzle internal pressure is the maximum pressure Pmax is smaller when the ratio A is 3.6 than when the ratio A is 1.3. This means that a ratio A of 3.6 is preferred over a ratio A of 1.3 in order to prevent the upward deviation of the air jet direction line C from the weft guide channel 14 . the

The curve Do in the graph of FIG. 5 is the change Δδ of the injection deflection angle δ of the air injection with respect to the change in the pressure inside the nozzle when the ratio A is 3.6. The jet deflection angle δ is the angle between the air jet direction line C shown in Fig. 2(c) and the weft insertion direction Lo when viewed along the extending direction of the deformed reed 12 (see Fig. 9(a)). Curve D1 is the change Δδ of the injection deflection angle δ with respect to the change of the pressure inside the nozzle when the ratio A is 1.3. The abscissa represents the internal pressure of the nozzle, and the ordinate represents the change Δδ of the jet deflection angle δ. the

In this graph, the jet deflection angle δ when the nozzle internal pressure is Pmax is expressed as 0° at the ordinate. A positive change in the jet deflection angle δ, ie Δδ > 0, means that the air jet direction line C is closer to the deformed reed 12 than when the nozzle internal pressure is the maximum pressure Pmax. A negative variation of the jet deflection angle δ, ie Δδ<0, means that the air jet direction line C moves further away from the deformed reed 12 than when the nozzle internal pressure is at the maximum pressure Pmax. When the negative change Δδ<0 of the jet deflection angle δ is larger, the air jet direction line C is moved farther away from the weft guide channel 14 of the deformed reed 12 . the

As is apparent from the comparison between the curve D0 and the curve D1, the change Δδ of the injection deflection angle δ is always positive when the ratio A is 3.6, and the value of the change Δδ becomes larger as the nozzle internal pressure becomes smaller. When the ratio A is 1.3, the change Δδ of the injection deflection angle δ is positive on the high pressure side but negative on the low pressure side. Since the air jet direction line C is directed upwards, the change Δδ of the jet deflection angle δ is more likely to deviate upward from the weft guide channel 14 if the air jet direction line C moves away from the deformed reed 12 . the

The graph of FIG. 5 shows that when the nozzle internal pressure is on the low pressure side, the deviation of the air injection direction line C from the weft guide passage 14 is less likely to occur when the ratio A is 3.6 than when the ratio A is 1.3. the

The curve Z in the graph of FIG. 6 represents the variation range Δεmax of the variation of the injection elevation angle ε with respect to the ratio A between the maximum pressure Pmax and the minimum pressure Pmin. The change range Δεmax is the change of the spray elevation angle ε when the internal pressure of the nozzle drops from the maximum pressure Pmax for weft insertion to the minimum pressure Pmin for weft insertion. It is preferable to set the minimum pressure Pmin as much as possible within a range capable of measuring the air jetting direction line C using a measuring device for measuring the air jetting direction as disclosed in Japanese Laid-Open Patent Publication No. 9-176937. Possibly low pressure. The abscissa indicates the ratio A, and the ordinate indicates the variation range Δεmax of the injection elevation angle ε. According to the curve Z, the larger the ratio A is, the smaller the variation range Δεmax of the injection elevation angle ε becomes. This means that a larger value of the ratio A is more preferred in order to prevent the air jet direction line C from deviating upwards from the weft guide channel 14 . the

Curve H in the graph of FIG. 7 represents the variation range Δδmax of the variation of the injection deflection angle δ with respect to the ratio A. In FIG. The change range Δδmax is the change of the jet deflection angle δ when the internal pressure of the nozzle drops from the maximum pressure Pmax for weft insertion to the minimum pressure Pmin for weft insertion. The abscissa indicates the ratio A, and the ordinate indicates the variation range Δδmax of the injection deflection angle δ. A positive change range of the jet deflection angle δ, ie, Δδmax>0, means that the air jet direction line C is closer to the deformed reed 12 than when the nozzle internal pressure is the maximum pressure Pmax. A negative variation range of the jet deflection angle δ, ie, Δδmax<0, means that the air jet direction line C moves farther away from the deformed reed 12 than when the nozzle internal pressure is the maximum pressure Pmax. the

As is apparent from the curve H, when the ratio A is 2 or less, the variation range Δδmax of the injection deflection angle δ is negative. In the case where the ratio A is 2 or less, the smaller the ratio A is, the larger the negative variation range (Δδmax<0) of the injection deflection angle δ becomes. As the negative variation range of the jet deflection angle δ (Δδmax<0) becomes larger, the air jet direction line C moves further away from the deformed reed 12 . Since the air jetting direction line C is facing upward, if the air jetting direction line C moves away from the deformed reed 12, the air jetting direction line C is more likely to deviate upward from the weft guide channel 14. the

If the ratio when the nozzle internal pressure is changed from the maximum pressure Pmax to the minimum pressure Pmin is defined as the ratio when the variation range Δδmax of the injection deflection angle δ becomes 0, then when the ratio A is A0 or greater, the injection deflection angle δ The variation range of △δmax is positive. In the case where the ratio A is a value of A0 or more, as the ratio A is larger, the range of positive variation (δmax>0) of the injection deflection angle Δδ becomes larger. The positive change range (δmax>0) of the jet deflection angle Δδ indicates that the air jet direction line C is closer to the deformed reed 12 than when the nozzle internal pressure is at the maximum pressure Pmax. Since the machining elevation angle α is facing upward, the air jet direction line C becomes lower as it approaches the deformed reed 12 . Therefore, as the air jet direction line C approaches the deformed reed 12 , the variation of the jet elevation angle ε in the upward direction is counteracted to facilitate the positioning of the air jet direction line C in the weft guide channel 14 . the

The value of A0 is greater than 2 but less than 2.5, in this embodiment, A0 is 2.2. As is apparent from FIG. 7, when the ratio A>A0, the variation range Δδmax of the injection deflection angle δ is always positive. Therefore, by determining the machining deflection angle β and the taper angle γ so that the ratio A is equal to or greater than the ratio A0, so that even when the nozzle internal pressure becomes the minimum pressure Pmin, the variation range Δδmax of the injection deflection angle δ does not become negative, The positioning of the air jet direction line C in the weft thread guide channel 14 is thereby facilitated. the

When the positive variation range (Δδmax>0) is larger, the air jetting direction line C is lowered, and the positioning of the air jetting direction line C in the weft guide channel 14 is facilitated. Therefore, when the ratio A is 3, the air injection direction line C is more easily positioned in the weft guide passage 14 than when the ratio A is 2.5. the

If the ratio A exceeds 3.6, the increment of the positive variation range (Δδmax>0) becomes smaller. When the ratio A is 4.5, the positive variation range Δδmax>0 is almost stable. When the processing deflection angle β is constant, the smaller the ratio A is, the smaller the taper angle γ is. When the taper angle γ is smaller, it is easier to process the injection hole 23 . Therefore, a ratio A of 4.5 or less is desirable. the

As shown in FIG. 8( a ), the intersection point between an imaginary plane 142 coplanar with the rear wall surface 141 of the weft guide passage 14 and the air injection direction line C of the air injected from the injection hole 111 is defined as Cn. the

Figure 8(b) shows that when the ratio A is 1.3, 2, 2.5, 3 and 3.6, when the internal pressure of the nozzle as shown in the waveform Np of Figure 3 changes from the maximum pressure Pmax for weft insertion to that for weft insertion The graph of the change of the intersection point Cn at the minimum pressure Pmin. The abscissa x indicates the weft insertion direction Lo, and the ordinate y indicates the upward direction. The x-y coordinate plane represents an imaginary plane 142 . the

When the nozzle internal pressure is the maximum pressure Pmax, the position of the intersection point Cn becomes almost the same in the cases where the ratio A is 1.3, 2, 2.5, 3, and 3.6. Therefore, this point of intersection is collectively denoted Co. the

The intersection points C0 and C1 are the changes of the intersection point when the ratio A is 1.3. The points of intersection C0 and C2 are the changes in the point of intersection when the ratio A is 2. The intersections C0 and C3 are the changes in the intersection when the ratio A is 2.5. The intersection points C0 and C4 are the changes of the intersection points when the ratio A is 3. The intersections C0 and C5 are the changes in the intersection when the ratio A is 3.6. the

The intersection point C0 is an intersection point when the pressure inside the nozzle is the maximum pressure Pmax. Intersection points C1, C2, C3, C4, and C5 are intersection points when the pressure inside the nozzle is the minimum pressure Pmin. the

When the ratio A is 1.3, the intersection point C1 deviates upward from the rear wall surface 141 . the

When the ratio A is 2, the intersection point C2 is near the upper edge 143 of the rear wall surface 141 . the

When the ratio A is 2.5, the intersection points C0 and C3 are within the rear wall surface 141 . the

When the ratio A is 3, the intersection points C0 and C4 are within the rear wall surface 141 . the

When the ratio A is 3.6, the intersection points C0 and C5 are within the rear wall surface 141 . the

In the case where the intersection point Cn deviates upward from the rear wall surface 141, a negative influence on the passing position of the weft yarn Y becomes significant, and a drop in the weft yarn passing speed and weft insertion failure may occur. When the ratio A is 2, the intersection C2 is near the upper edge 143 of the rear wall 141 , and when the ratio A is 2.5, the intersection C3 is inside the rear wall 141 . That is, when the ratio A is 2.5, the intersection point Cn is prevented from deviating upward from the rear wall surface 141 with high reliability. the

When the ratio A is 3, both intersections C0 and C4 are located within the rear wall surface 141 . Therefore, when the ratio A is 3.0, the intersection point Cn is prevented from deviating upward from the rear wall surface 141 with higher reliability. the

When the ratio A is 3, the intersection point C4 is located inside the upper edge 143 of the rear wall surface 141 . When the ratio A is 3.6, the intersection point C5 is positioned on the inner side (or lower) than the intersection point C4. That is, when the ratio A is 3.6, the intersection point Cn is prevented from deviating upward from the rear wall surface 141 with even higher reliability. the

The above-described embodiment has the following advantages. the

(1) As shown in Figure 7, A0 is when the internal pressure of the nozzle changes from the maximum pressure Pmax to the minimum pressure Pmin when the air injection is performed at the auxiliary nozzle 21, when the variation range Δδmax of the injection deflection angle δ becomes 0 The value of γ/β. The value of A0 is greater than 2 but less than 2.5. When the ratio A is greater than the value of A0, the variation range Δδmax of the injection deflection angle δ is positive. In the case where the variation range Δδmax is positive, even when the pressure inside the nozzle changes from the maximum pressure Pmax to the minimum pressure Pmin at the air injection end, the air injection direction line C approaches the deformed reed 12, and since it is shown in FIG. 4 The effect caused by the increase of △ε due to the change of jet elevation angle ε is counteracted. The possibility that the air jet direction line C deviates upward from the weft guide channel 14 is thus reduced. the

Therefore, the inequality for the proportion A is satisfied:

γ/β= A ≥ A0

The auxiliary nozzle 21 for weft insertion reduces the possibility that the air injection direction line C of the air injected from the injection hole 23 deviates from the weft guide passage 14 due to the drop in nozzle internal pressure.

(2) The variation range Δδmax of the injection deflection angle δ when the ratio A is 2.5 is larger than the variation range Δδmax of the injection deflection angle δ when the ratio A is A0. The nozzle internal pressure at which the air injection at the auxiliary nozzle 21 is completed is lower than the minimum pressure Pmin for weft insertion at which the air injection direction line C is measurable. When the ratio is A0, the variation range Δδmax of the injection deflection angle δ may become negative when the nozzle internal pressure becomes lower than the minimum pressure Pmin. The configuration in which A is 2.5 or more facilitates the positioning of the air jetting direction line C in the weft guide passage 14 with high reliability. the

(3) The variation range Δδmax of the injection deflection angle δ when the ratio A is 3 is larger than the variation range Δδmax of the injection deflection angle δ when the ratio A is 2.5. Thus, the configuration in which A is 3 or more facilitates the positioning of the air jetting direction line C in the weft guide passage 14 with higher reliability. the

(4) Even when the ratio A is larger than 4.5, the positive variation range Δδmax remains almost stable. Usually, the injection hole 23 is formed by electrical discharge machining. When the processing deflection angle β is constant, the smaller the ratio A is, the smaller the taper angle γ is. The smaller the taper angle γ, the easier it is to process the injection hole 23 . Therefore, the configuration in which A is 4.5 or less is advantageous in facilitating the processing of the injection hole 23 . the

The present invention can also be practiced in the following examples. the

The injection hole may be a hole in the shape of a frusto-elliptical cone. the

Claims (5)

1. the weft inserting apparatus in a jet loom, wherein said weft inserting apparatus comprises the have spray-hole pilot jet for wefting insertion (21) of (23), from described spray-hole, spray air to carry the weft yarn (Y) in weft yarn guiding channel (14), wherein said spray-hole (23) is taper, so that the sectional area of described hole (23) reduces towards the air injection direction of pilot jet (21), it is characterized in that, the ratio A of the processing deviation angle β of the bevel angle γ of described spray-hole (23) and described spray-hole (23), γ/β=A, there is the relation being represented by inequality (1):

A≥A0 …（1）

Wherein A0 is when the expulsion pressure of described pilot jet (21) is changed to minimum pressure for wefting insertion (Pmin) from maximum pressure for wefting insertion (Pmax), and the excursion (△ δ max) of spraying the deviation angle (δ) becomes the value of the γ/β of 0 o'clock.

2. weft inserting apparatus according to claim 1, wherein said ratio A is 2.5 or larger.

3. weft inserting apparatus according to claim 1, wherein said ratio A is 3 or larger.

4. weft inserting apparatus according to claim 1, wherein said ratio A is 4.5 or less.

5. according to the weft inserting apparatus described in claim 1 to 4 any one, wherein said spray-hole is the shape of frustum of a cone.

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