CN111663232A - Weft insertion device for air-jet looms - Google Patents

Abstract

The weft insertion device of the air jet loom of the present invention is provided with a deformable reed (1), and the deformable reed (1) is swingably arranged to form a weft insertion passage by arranging a plurality of reed teeth (5) each having a concave portion (15). (S), and alternately repeat the forward movement and the backward movement. The plurality of reed teeth (5) include: a first row of reed teeth (21), the inner wall surface (18) of which is inclined at a first inclination angle (θ1) with respect to the axis (J) of the weft insertion passage (S); and a second The reed dentition (22), the inner wall surface (18) of which is inclined at a second inclination angle (θ2) larger than the first inclination angle, supplies the leading end of the weft yarn at the timing when the swing operation of the deformed reed is switched from the backward movement to the forward movement When the passing position is set to the first position (E1), the boundary position (P) between the first reed tooth row (21) and the second reed tooth row (22) is set to the first position (E1).

Description

Weft insertion device for air-jet looms

technical field

The present invention relates to a weft insertion device of an air jet loom.

Background technique

The air jet loom is provided with a weft insertion device for performing weft insertion by blowing air from a nozzle to fly the weft yarn. A deformation reed is arranged in the weft insertion device. The deformed reed is formed by arranging a plurality of reed teeth having concave portions for forming weft insertion passages in the weft insertion direction. The weft insertion passage is a passage for flying the weft yarn by the flow of the air injected from the nozzle to the weft insertion passage.

In addition, the weft insertion device of the air jet loom includes a main nozzle and a plurality of sub-nozzles. The plurality of sub-nozzles inject air in a relay manner in order to assist the flying of the weft yarn by the injection of the air from the main nozzle. Each sub-nozzle sprays air obliquely with respect to the weft insertion passage. At this time, a part of the air injected from the sub-nozzle to the weft insertion passage leaks to the rear side of the deformed reed through the gap between the reed teeth. Such air leakage reduces the amount of air that contributes to the flying of the weft yarn, and thus causes a decrease in the flying speed of the weft yarn.

Therefore, in the conventional deformable reed, the technique of inclining the inner wall surface of the recessed portion in each of the reed teeth is employed. Specifically, the back wall surface of the recessed portion is inclined in the direction entering the weft insertion passage side as it goes toward the weft insertion direction. When the back wall surface of the recessed portion is inclined in this way, when air is ejected from the sub-nozzle toward the weft insertion passage, the amount of air that contacts the back wall surface of the recessed portion and is reflected toward the weft insertion passage side increases. Therefore, the amount of air leaking through between the reed teeth can be reduced.

As such a deformed reed, Patent Document 1 describes that among a plurality of reed teeth arranged in the weft insertion direction, the inclination angle of the back wall surface of the reed tooth to which the row of reed teeth arranged in the region close to the main nozzle belongs is set. The deformed reed is smaller than the inclination angle of the back wall surface of the reed teeth to which the row of reed teeth arranged in the region opposite to the main nozzle belongs. When this deformed reed is used, the amount of air reflected from the back wall of the reed teeth toward the weft insertion passage side is reduced in a region close to the main nozzle that is greatly affected by the air ejected from the main nozzle. Therefore, it is possible to suppress the occurrence of a malfunction in which the leading end of the weft thread flies out of the weft insertion passage due to the air reflected from the back wall surface of the reed teeth.

Patent Document 1: Japanese Patent Application Laid-Open No. 5-86544

One of the failures that occurs in air-jet looms is "end curl". The end crimping is a phenomenon in which the leading end of the weft yarn enters between the reed teeth and contacts the reed teeth during the flying in the weft insertion path, so that the flying state of the weft yarn becomes unstable and the leading end side of the weft yarn is curled. Because the leading end of the weft yarn is affected by the swinging motion of the deformed reed and approaches the inner wall surface of the reed teeth, end crimping is likely to occur (details will be described later). However, since the technique described in Patent Document 1 does not take into account the influence of the swinging motion of the deformation reed, it is impossible to suppress the occurrence of curling of the end portion.

SUMMARY OF THE INVENTION

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a weft insertion device for an air jet loom capable of suppressing the occurrence of end crimps when weft insertion is performed along the weft insertion path of the deformed reed.

The weft insertion device of the air jet loom according to the present invention includes a deformable reed that is oscillatingly provided so that a plurality of reed teeth each having a concave portion formed by an upper wall surface, a lower wall surface, and a back wall surface are arranged in a weft insertion direction The weft insertion passage is formed, and the forward movement in the beating-up direction and the backward movement in the reverse beating-up direction are alternately repeated. The first inclination angle is inclined toward the direction entering the weft insertion passage side as it goes toward the weft insertion direction; The second inclination angle with a large first inclination angle is inclined in the direction entering the weft insertion passage side as it goes toward the weft insertion direction, and is used for the leading end of the weft yarn to pass at the timing when the swing operation of the deformed reed is switched from the backward movement to the forward movement. When the position is set to the first position, the boundary position of the first reed tooth row and the second reed tooth row is set to the first position or the downstream side in the weft insertion direction from the first position.

In the weft insertion device for an air-jet loom according to the present invention, the position at which the leading end of the weft yarn passes at the timing when the brake is started to be applied to the weft yarn running in the weft insertion passage may be set as the second position. In this case, the second position is located on the downstream side of the weft insertion direction from the first position, and the boundary position between the first reed tooth row and the second reed tooth row is set at the second position or upstream from the second position in the weft insertion direction. side.

In the weft insertion device of the air jet loom according to the present invention, the plurality of reed teeth may include a third reed tooth row arranged on the upstream side of the first reed tooth row in the weft insertion direction, and the third reed tooth row may be configured such that The inner wall surface of the reed tooth to which the dentition belongs has an inclination angle smaller than the first inclination angle.

According to the present invention, when the weft is inserted along the weft insertion path of the deformed reed, it is possible to suppress the occurrence of end crimping.

Description of drawings

FIG. 1 is a side sectional view showing a weft insertion device of an air jet loom according to an embodiment of the present invention.

2 is a schematic front view showing the weft insertion device of the air jet loom according to the embodiment of the present invention.

3 is a perspective view of a main part showing the weft insertion device of the air jet loom according to the embodiment of the present invention.

Fig. 4 is a view of the deformed reed according to the first embodiment of the invention, taken at the position D-D in Fig. 1 .

FIG. 5 is a diagram showing the relationship between the angular velocity of the reed and the machine angle in the swinging motion of the deformed reed.

6 is a diagram showing a change in the position of the leading end of the weft yarn in the first embodiment of the present invention.

FIG. 7 is a diagram showing the measurement result of the wind pressure value in the weft insertion passage when the deformed reed according to the first embodiment of the present invention is used.

8 is a view showing air flowing between the reed teeth when the deformed reed moves backward.

9 is a view showing air flowing between the reed teeth when the deformed reed moves forward.

Fig. 10 is a view showing a state in which the leading end of the weft yarn is drawn between the reed teeth.

FIG. 11 is a cross-section of the deformed reed according to the second embodiment of the invention at the D-D position in FIG. 1 .

Fig. 12 is a diagram showing a change in the position of the leading end of the weft yarn in the second embodiment of the present invention.

13 is a diagram showing a measurement result of the wind pressure value in the weft insertion passage when the deformed reed according to the second embodiment of the present invention is used.

FIG. 14 is a cross-section of the deformed reed according to the third embodiment of the invention at the D-D position in FIG. 1 .

15 is a diagram showing the measurement result of the wind pressure value in the weft insertion passage when the deformed reed according to the third embodiment of the present invention is used.

Explanation of reference numerals

1...deformation reed; 5, 5a, 5b, 5c...reed teeth; 15...concave portion; 16...upper wall surface; 17...lower wall surface; 18...inner wall surface; 20...reed tooth row (third row of reed teeth); 21... Reed dentition row (first reed dentition row); 22…reed dentition row (second reed dentition row); E1…first position; E2…second position; F…beating direction; P…boundary position; R…reverse Beat-up direction; X1...weft insertion direction; S...weft insertion path; θ1...first inclination angle; θ2...second inclination angle.

Detailed ways

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(first embodiment)

1 is a side cross-sectional view showing a weft insertion device of an air jet loom according to an embodiment of the present invention, FIG. 2 is a schematic front view thereof, and FIG. 3 is a perspective view of a main part thereof.

As shown in FIGS. 1 to 3 , the weft insertion device of the air jet loom includes a deformable reed 1 . The deformed reed 1 is installed on the reed base 2 . This deformable reed 1 includes a pair of upper and lower reinforcement members 3 and 4 and a plurality of reed teeth 5 held by these reinforcement members 3 and 4 . The deformation reed 1 is an elongated member whose weaving width direction is the longitudinal direction. The plurality of reed teeth 5 are arranged at predetermined intervals along the longitudinal direction X of the deformed reed 1 . A gap for allowing the warp yarn T to pass is provided between the reed teeth 5 adjacent to each other in the longitudinal direction X of the deformed reed 1 . Among the pair of reinforcing members 3 and 4 , the upper reinforcing member 3 sandwiches the upper edge portions of the plurality of reed teeth 5 , and the lower reinforcing member 4 sandwiches the lower edge portions of the plurality of reed teeth 5 . Moreover, the reinforcement member 4 on the lower side is fixed to the reed 2 by the member 6 for fixing.

The main nozzle 7 is arranged on the upstream side of the deformed reed 1 in the weft insertion direction X1. The weft insertion direction X1 is the direction in which the weft yarn Y advances when the weft yarn Y is wefted by the air jetted from the main nozzle 7 . The main nozzle 7 is a nozzle for weft insertion of the weft yarn Y at the opening of the warp yarn T divided into upper and lower parts. On the other hand, a plurality of sub-nozzles 8 are arranged in the longitudinal direction X of the deformable reed 1 . When the weft yarn Y is caused to fly by the jet of air from the main nozzle 7 , these sub-nozzles 8 spray the air in a relay manner in order to assist the flying of the weft yarn Y. Each sub-nozzle 8 is attached to the reed 2 via a nozzle support member 9 . The nozzle support member 9 is fixed to the sled 2 with bolts 11 and nuts 12 .

Recesses 15 are formed on the front surfaces of the plurality of reed teeth 5, respectively. The recessed portion 15 is formed by the upper wall surface 16 , the lower wall surface 17 , and the inner wall surface 18 . The side of the recessed portion 15 facing the inner wall surface 18 is opened. The inner wall surface 18 is a surface including at least a wall surface located on the innermost side when the concave portion 15 of the reed teeth 5 is viewed from the opening side (front surface side). A weft insertion passage S is formed in the deformed reed 1 by the recesses 15 formed in each of the reed teeth 5 . The weft insertion passage S is a passage formed by a row of the recessed portions 15 included in each of the reed teeth 5 by arranging the plurality of reed teeth 5 in the weft insertion direction X1. The axis J passing through the center of the weft insertion path S is an axis parallel to the longitudinal direction X of the deformed reed 1 . On the other hand, as shown in FIG. 3 , each of the sub-nozzles 8 ejects the air As obliquely with respect to the axis J of the weft insertion passage S. As shown in FIG.

The deformation reed 1 is provided so as to be capable of swinging operation by a swinging mechanism (not shown). The swinging motion of the deformed reed 1 is for beating-up. The deformation reed 1 performs a swinging operation so as to alternately repeat the forward movement in the beating-up direction F and the backward movement in the reverse beating-up direction R. Furthermore, the beating-up by the deformed reed 1 is performed when the deformed reed 1 moves forward.

4 : is a figure which cut|disconnected the deformation|transformation reed which concerns on the 1st Embodiment of this invention at the D-D position of FIG. 1. FIG.

As shown in FIG. 4 , the plurality of reed teeth 5 are divided into two rows of reed teeth 21 and 22 in the longitudinal direction X of the deformed reed 1 . The row of reed teeth 21 corresponds to the row of first reed teeth, and the row of reed teeth 22 corresponds to the second row of reed teeth. The reed tooth row 21 is composed of a plurality of reed teeth 5 a arranged in the longitudinal direction X of the deformed reed 1 , and the reed tooth row 22 is composed of a plurality of reed teeth 5 b arranged in the longitudinal direction X of the deformed reed 1 . The row of reed teeth 22 is arranged on the downstream side of the row of reed teeth 21 in the weft insertion direction X1. In addition, the reed teeth 5a arranged on the most downstream side in the reed tooth row 21 and the reed teeth 5b arranged on the most upstream side in the reed tooth row 22 are arranged adjacent to each other in the weft insertion direction X1.

The back wall surfaces 18 of the reed teeth 5a belonging to the reed tooth row 21 are inclined in the direction entering the weft insertion passage S toward the weft insertion direction X1, and the back wall surfaces 18 of the reed teeth 5b belonging to the reed tooth row 22 are also inclined towards the weft insertion direction. The direction X1 is inclined to the direction entering the weft insertion path S side. In addition, the inner wall surface 18 of the reed teeth 5a belonging to the reed tooth row 21 is inclined with respect to the axis J of the weft insertion passage S at a first inclination angle θ1. On the other hand, the inner wall surface 18 of the reed teeth 5b belonging to the reed tooth row 22 is inclined with respect to the axis J of the weft insertion passage S at a second inclination angle θ2 larger than the first inclination angle θ1. In the reed tooth row 21, the back wall surfaces 18 of the reed teeth 5a are inclined at the same inclination angle θ1, and in the reed tooth row 22, the back wall surfaces 18 of the reed teeth 5b are inclined at the same inclination angle θ2.

In addition, the boundary position P of the reed tooth row 21 and the reed tooth row 22 is set as follows.

First, when air is injected from the main nozzle 7 and the plurality of sub-nozzles 8 to fly the weft yarn Y at a predetermined timing, the weft yarn Y moves in the weft insertion direction X1 with the flow of the air. At this time, if the position through which the leading end of the weft yarn Y passes at the timing when the swinging motion of the deformed reed 1 is switched from the backward movement to the forward movement is set as the first position E1, the boundary position P of the reed tooth rows 21 and 22 is set at the first position E1. The first position E1. The first position E1 is a position specified based on the design of the weft insertion device, experimental data when the weft insertion device is operated, or a simulation result of the weft insertion device. Hereinafter, the setting of the boundary position P of the reed tooth rows 21 and 22 will be described in further detail.

FIG. 5 is a diagram showing the relationship between the angular velocity of the reed and the machine angle in the swinging motion of the deformed reed.

The angular velocity of the reed may take a negative value and a positive value depending on the moving direction when the deformed reed 1 performs a swinging motion. The period during which the angular velocity of the reed takes a negative value is the period during which the deformed reed 1 moves backward (hereinafter, also referred to as "reverse movement period"). The backward movement period is a period during which the machine bed angle is 0° to 180°. On the other hand, a period during which the angular velocity of the reed takes a positive value is a period during which the deformed reed 1 moves forward (hereinafter, also referred to as a "forward movement period"). The forward movement period is a period during which the machine bed angle is 180° to 360°. In this case, the timing at which the deformation reed 1 is switched from the backward movement to the forward movement is the timing when the machine bed angle is 180°. In addition, the timing of switching the deformation reed 1 from the backward movement to the forward movement may be shifted forward or backward from the timing when the machine angle is 180° due to the design of the weft insertion device.

On the other hand, the period during which weft insertion of the weft yarn Y is performed (hereinafter, referred to as "weft insertion period".) Ta is a period during which the machine angle is 80° to 240°. Therefore, the middle time of the weft insertion period Ta is the time when the machine angle is 160°, that is, the time when the deformed reed 1 moves backward. Therefore, when the leading end of the weft yarn Y is moved in the longitudinal direction X of the deformed reed 1 during the weft insertion period Ta, if the position through which the leading end of the weft yarn Y passes at the middle of the weft insertion period Ta is the intermediate position C in FIG. 4 , Then, the boundary position P between the reed tooth row 21 and the reed tooth row 22 is set on the downstream side of the intermediate position C in the weft insertion direction X1. In addition, the start time and the end time of the weft insertion period Ta may be set to deviate from the range of the above-mentioned machine angle due to the design of the weft insertion device.

Fig. 6 is a diagram showing a change in the position of the leading end of the weft yarn in the first embodiment of the present invention. In FIG. 6 , the vertical axis represents the longitudinal position of the deformed reed, and the horizontal axis represents the machine angle. The longitudinal position of the deformed reed sets the start end of weft insertion to 0. The start end of weft insertion refers to the end of the deformation reed on the side where the main nozzle is arranged in the longitudinal direction of the deformation reed.

As shown in FIG. 6 , the length of the deformation reed from the front end of the weft yarn from the time when the machine angle = 80°, which is the start time of the weft insertion period Ta, to the time when the machine angle = 240°, which is the end time of the weft insertion period Ta, is the length of the deformed reed. direction move. In addition, the leading end of the weft yarn passes through the first position E1 in the longitudinal direction of the deformed reed when the machine angle is 180°. The boundary position P between the row of reed teeth 21 and the row of reed teeth 22 is set to match the first position E1 (see FIG. 4 ).

In this way, when the boundary position P between the reed tooth row 21 and the reed tooth row 22 is set to the first position E1, the measurement result of the wind pressure value (cmAq) in the weft insertion passage S is as shown in FIG. 7 . The measurement of the wind pressure value was performed in a state where the deformation reed 1 was stopped without swinging. As a measurement procedure, first, with respect to the wind pressure measurement point in the weft insertion passage S of the deformed reed 1, a sub-piece for wind pressure measurement is arranged at a position 50 mm away from the wind pressure measurement point to the upstream side in the weft insertion direction X1. nozzle. Next, while ejecting a certain amount of air from the sub-nozzle for air pressure measurement toward the weft insertion passage S, the position of the sub-nozzle for air pressure measurement is moved in the longitudinal direction X of the deformation reed 1. The sensor measures the wind pressure value at the wind pressure measurement point in the weft insertion passage S. At this time, the position of the wind pressure measurement point moves according to the movement of the sub-nozzle for wind pressure measurement. If the measurement result is observed, the wind pressure value in the weft insertion path S is a constant value L1 from the beginning of the weft insertion to the first position E1, but if it exceeds the first position E1, ΔL is increased, and from there to the end of the weft insertion is A certain value L2.

The reason why the wind pressure value in the weft insertion path S changes in this way is as follows.

First, in the longitudinal direction X of the deformed reed 1, the row of reed teeth 21 is located on the start end side of weft insertion from the first position E1, and the row of reed teeth 22 is located on the end side of the weft insertion from the first position E1. In addition, the back wall surface 18 of the reed teeth 5a belonging to the reed tooth row 21 is inclined at a first inclination angle θ1, and the back wall surface 18 of the reed teeth 5b belonging to the reed tooth row 22 is inclined at a second inclination angle θ2 larger than the first inclination angle θ1 tilt. When air is ejected toward the weft insertion passage S from the sub-nozzle for wind pressure measurement, the larger the inclination angle of the inner wall surface 18 of the reed 5 is, the larger the wind pressure value in the weft insertion passage S becomes. This is because when the air is ejected from the sub-nozzle for air pressure measurement toward the weft insertion passage S, when the inclination angle of the back wall surface 18 increases, the back wall surface 18 of the reed teeth 5 comes into contact with the weft insertion passage S side. The amount of reflected air increases, and the wind pressure value in the weft insertion passage S increases due to the increase in the amount of air. Therefore, in the longitudinal direction X of the deformed reed 1, the wind pressure value in the weft insertion passage S is larger than the first position E1 by ΔL on the end side of the weft insertion, as shown in FIG. 7 .

Next, the technical significance of setting the boundary position P between the reed tooth row 21 and the reed tooth row 22 at the first position E1 will be described.

First, when the deformable reed 1 is caused to perform a rocking motion, the movement of the deforming reed 1 during the rocking motion generates a flow of air between the reed teeth 5 . Specifically, as shown in FIG. 8 , when the deformed reed 1 moves in the reverse beating direction R, the air A flows between the reed teeth 5 in a direction opposite to the moving direction R. In addition, as shown in FIG. 9, when the deformed reed 1 moves in the beating direction F, the air A flows between the reed teeth 5 in the direction opposite to the moving direction F. As shown in FIG.

On the other hand, when air is ejected from each sub-nozzle 8 toward the weft insertion passage S, a part of the air leaks to the rear side of the deformed reed 1 through the gaps between the reed teeth 5 . At this time, the amount of air leaked between the reed teeth 5 is different when the deformed reed 1 moves in the reverse beating direction R and when the deformed reed 1 moves in the beating direction F. The reason for this is as follows.

First, when the deformed reed 1 moves in the reverse beating direction R, the air A (see FIG. 8 ) flowing between the reed teeth 5 suppresses the air As jetted from the sub-nozzles 8 toward the weft insertion passage S the role of leakage. Therefore, the amount of air leaking to the rear side B of the deformation reed 1 is reduced. On the other hand, when the deformed reed 1 moves in the beating direction F, the air A (see FIG. 9 ) flowing between the reed teeth 5 promotes the air ejected from the sub-nozzles 8 toward the weft insertion passage S. As the role of leakage. Therefore, the amount of air leaking to the rear side B of the deformation reed 1 increases.

Here, assuming that only the row of reed teeth 21 is arranged in the entire longitudinal direction X of the deformed reed 1, as shown in FIG. As shown, the leading end of the weft yarn Y is easily approached to the inner wall surface 18 and is introduced between the reed teeth 5 . When the leading end of the weft yarn Y is drawn between the reed teeth 5, the leading end of the weft yarn Y contacts the reed teeth 5 and the flying state becomes unstable, and a phenomenon in which the leading end side of the weft yarn Y curls into a wave shape, that is, end curling occurs.

In the first embodiment, the boundary position P between the row of reed teeth 21 and the row of reed teeth 22 is set at the first position E1. The first position E1 is a position at which the leading end of the weft yarn Y passes at the timing when the swinging operation of the deforming reed 1 is switched from the backward movement to the forward movement. Therefore, the leading end of the weft yarn Y passes through the section of the row of reed teeth 21 when the deformed reed 1 moves backward, and passes through the section of the row of reed teeth 22 when the deformed reed 1 moves forward. In addition, in this first embodiment, the back wall surface 18 of the reed teeth 5b belonging to the reed tooth row 22 is inclined at the second inclination angle θ2 larger than the first inclination angle θ1. Therefore, in the air ejected from the sub-nozzle 8, the back wall surface 18 of the reed teeth 5b is in contact with the back wall surface 18 of the reed teeth 5b on the side of the weft insertion passage S on the end side of the weft insertion relative to the boundary position P between the reed tooth row 21 and the reed tooth row 22. The amount of reflected air increases. Therefore, when the leading end of the weft yarn Y passes through the end side of the weft insertion from the boundary position P, the weft yarn Y is difficult to approach the back wall surface 18 due to an increase in the amount of air reflected from the back wall surface 18 of the reed teeth 5b. As a result, even during the advancing movement of the deformed reed 1, the leading end of the weft yarn Y is hardly drawn between the reed teeth 5b, so that the occurrence of end crimping can be suppressed. In addition, the amount of air leaking to the rear side of the deformed reed 1 through the gaps between the reed teeth 5b is reduced on the end side of the weft insertion from the boundary position P, so that the reduction in the flying speed due to air leakage can be suppressed.

In addition, when the boundary position P between the reed tooth row 21 and the reed tooth row 22 is set on the upstream side of the weft insertion direction X1 from the first position E1, the leading end of the weft yarn Y reaches the front end of the weft yarn Y during the retreating movement of the deformed reed 1. Reed dentition 22. In this case, the force of the air reflected from the back wall surface 18 of the reed teeth 5b belonging to the reed tooth row 22 toward the weft insertion passage S is caused by the air A flowing between the reed teeth 5 by the backward movement of the deformed reed 1 (see FIG. 8) Enhancement. Therefore, it is easy to cause a problem that the leading end of the weft yarn Y flies out of the weft insertion path S. As shown in FIG. On the other hand, when the boundary position P between the reed tooth row 21 and the reed tooth row 22 is set at the first position E1, the leading end of the weft yarn Y does not reach the reed tooth row 22 during the backward movement of the deformed reed 1. Therefore, the occurrence of a malfunction in which the leading end of the weft yarn Y flies out of the weft insertion path S can be suppressed.

(Second Embodiment)

Next, a second embodiment of the present invention will be described.

First, the effect obtained by the above-described first embodiment can be obtained also when the boundary position P between the reed tooth row 21 and the reed tooth row 22 is set to the downstream side in the weft insertion direction X1 from the first position E1. However, in this case, it is necessary to set the boundary position P of the reed tooth row 21 and the reed tooth row 22 in consideration of the braking process performed after the leading end of the weft yarn Y has passed the first position E1. Hereinafter, a detailed description will be given.

First, in the weft insertion device of the air jet loom, when the weft yarn Y is galloped by jetting air from the main nozzle 7 and the plurality of sub-nozzles 8 at predetermined timings, the weft yarn Y during the galloping may be braked. The timing at which the application of the brake to the weft yarn Y is started is later than the timing at which the swing operation of the deforming reed 1 is switched from the backward movement to the forward movement. Therefore, if the position at which the leading end of the weft yarn Y passes at the timing when the weft yarn Y in the running is started to pass is the second position E2, the second position E2 is located downstream in the weft insertion direction X1 from the first position E1. side offset position.

When a brake is applied to the flying weft yarn Y, the flying speed of the weft yarn Y decreases and the linearity of the weft yarn Y is weakened. Therefore, in the second embodiment, as shown in FIG. 11 , the boundary position P between the row of reed teeth 21 and the row of reed teeth 22 is set at the second position E2 so that even if the leading end of the weft yarn Y passes through the second position E2, It is also difficult for the leading end of the weft yarn Y to be sucked between the reed teeth 5 . The second position E2 is a position specified based on the design of the weft insertion device, experimental data when the weft insertion device is operated, or a simulation result of the weft insertion device.

Fig. 12 is a diagram showing a change in the position of the leading end of the weft yarn in the second embodiment of the present invention.

As shown in FIG. 12 , the leading end of the weft yarn moves in the longitudinal direction of the deformed reed from the time when the machine angle = 80°, which is the start time of the weft insertion period, to the time when the machine angle = 240°, which is the end time of the weft insertion period. . The leading end of the weft yarn passes through the first position E1 in the longitudinal direction of the deforming reed when the machine angle is 180°, and passes through the second position E2 in the longitudinal direction of the deforming reed when the machine angle is 205°. Then, after the leading end of the weft yarn has passed the second position E2, the ratio of the positional change of the leading end of the weft yarn becomes small. This is because when the leading end of the weft yarn passes through the second position E2, the brake is started to be applied to the weft yarn, thereby reducing the flying speed of the weft yarn. The boundary position P between the row of reed teeth 21 and the row of reed teeth 22 is set so as to match the second position E2.

In this way, when the boundary position P between the reed tooth row 21 and the reed tooth row 22 is set to the second position E2, as shown in FIG. From the beginning of the weft insertion to the second position E2 is a certain value L1, if it exceeds the second position E2, ΔL is increased, and from there to the end of the weft insertion is a certain value L2. This measurement result refers to the difference between the amount of air reflected by contact with the back wall surface 18 of the reed teeth 5b of the reed tooth row 22 at the end of the weft insertion from the second position E2 and the amount of air reflected from the beginning of the weft insertion at the second position E2. The amount of air reflected by contact with the back wall surface 18 of the reed teeth 5a of the reed tooth row 21 is relatively large.

Next, the technical significance of setting the boundary position P of the reed tooth row 21 and the reed tooth row 22 to the second position E2 will be described.

First, when the deformation reed 1 is oscillated, the flow of air A occurs between the reed teeth 5 according to the movement direction of the deformation reed 1 as shown in FIGS. 8 and 9 described above. At this time, the air A (refer to FIG. 9 ) flowing between the reed teeth 5 due to the movement of the deformed reed 1 in the beating direction F plays a role of promoting the leakage of the air ejected from each sub-nozzle 8 toward the weft insertion passage S . However, when the swing operation of the deformation reed 1 is switched from the backward movement to the forward movement, the movement speed of the deformation reed 1 is substantially zero, and the deformation reed 1 starts to move forward from this state. Therefore, after the forward movement of the deformation reed 1 is started until the moving speed of the deformation reed 1 is sufficiently increased, the influence of the forward movement of the deformation reed 1 on the flying state of the weft yarn Y becomes small. Therefore, even if the boundary position P between the reed tooth row 21 and the reed tooth row 22 is set to deviate from the first position E1 on the end of the weft insertion, the effect of suppressing the occurrence of end curling is not so large. difference. However, when the leading end of the weft yarn Y passes through the second position E2, the weft yarn Y is braked to reduce the flying speed of the weft yarn Y, so that the leading end of the weft yarn Y is easily drawn between the reed teeth 5. On the other hand, when the boundary position P between the reed tooth row 21 and the reed tooth row 22 is set to the second position E2, the rear wall surface 18 of the reed tooth 5b is located on the end side of the weft insertion from the second position E2. The amount of air reflected toward the weft insertion path S by the contact increases. Therefore, even if the leading end of the weft yarn Y passes through the second position E2, the leading end of the weft yarn Y is less likely to be sucked between the reed teeth 5b. Therefore, it is possible to suppress the occurrence of edge curling.

(third embodiment)

Next, a third embodiment of the present invention will be described.

The third embodiment of the present invention, as shown in FIG. 14 , is different from the above-described first embodiment in that the plurality of reed teeth 5 are divided into three reed tooth rows 20, 21, 22. The reed dentition 21 corresponds to the first reed dentition, the reed dentition 22 corresponds to the second reed dentition, and the reed dentition 20 corresponds to the third reed dentition. The row of reed teeth 20 is constituted by a plurality of reed teeth 5 c arranged in the longitudinal direction X of the deformed reed 1 . The row of reed teeth 20 is arranged on the upstream side of the row of reed teeth 21 in the weft insertion direction X1. The boundary position P0 of the reed tooth row 20 and the reed tooth row 21 is set to the side closer to the main nozzle 7 than the boundary position P of the reed tooth row 21 and the reed tooth row 22 .

Among the three reed tooth rows 20, 21, and 22, the inner wall surface 18 of the reed tooth 5a belonging to the reed tooth row 21 is inclined at the first inclination angle θ1, and the inner wall surface 18 of the reed tooth 5b belonging to the reed tooth row 22 is inclined at the second inclination angle θ1. The inclination angle θ2 is the same as in the above-described first embodiment. On the other hand, the inner wall surface 18 of the reed teeth 5c belonging to the reed tooth row 20 is set to a third inclination angle smaller than the first inclination angle θ1 with respect to the axis J of the weft insertion passage S, specifically, the inclination angle is substantially is 0°.

In this way, when the reed tooth row 20 is arranged near the main nozzle 7 and the inclination angle of the back wall surface 18 of the reed tooth 5c belonging to the reed tooth row 20 is set to be small, the wind pressure value in the weft insertion passage S is The measurement results of (cmAq) are shown in FIG. 15 . That is, the wind pressure value in the weft insertion path S is a constant value L0 from the start end of the weft insertion to the E0 position, increases by ΔL1 when it exceeds the E0 position, and becomes a constant value L1 from there to the first position E1. In addition, when it exceeds the 1st position E1, the wind pressure value in the weft insertion path S will increase by ΔL, and it will become a constant value L2 from there to the terminal of weft insertion. This measurement result refers to the amount of air reflected by contact with the back wall surface 18 of the reed teeth 5c of the reed tooth row 20 at the start end side of the weft insertion from the E0 position, and the amount of air reflected from the end side of the weft insertion at the E0 position and the reed tooth row. The amount of air reflected by contact with the inner wall surface 18 of the reed teeth 5a of 21 is relatively small. In addition, the above-mentioned measurement results refer to the difference between the amount of air reflected by contact with the back wall surface 18 of the reed teeth 5b of the reed tooth row 22 at the end of the weft insertion at the first position E1 and the weft insertion at the first position E1. The amount of air reflected by contact with the back wall surface 18 of the reed teeth 5a of the reed tooth row 21 at the start end side of the reed tooth row 21 is relatively large.

When the row of reed teeth 20 is arranged near the main nozzle 7, when the leading end of the weft yarn Y passes through the section of the row of reed teeth 20, the air jetted from the main nozzle 7 greatly affects the flying state of the weft yarn Y. Therefore, if the inclination angle of the back wall surface 18 of the reed teeth 5c belonging to the reed tooth row 20 is set to be large, the air ejected from the main nozzle 7 comes into contact with the back wall surface 18 of the reed teeth 5c and enters the weft insertion passage S The amount of side-reflected air is increased. In this case, a failure in which the leading end of the weft yarn Y flies out of the weft insertion path S is likely to occur.

Therefore, in the third embodiment, the inclination angle of the back wall surface 18 of the reed teeth 5c belonging to the reed tooth row 20 is set to be small. Therefore, when the leading end of the weft yarn Y passes through the section of the row of reed teeth 20 due to the jet of air from the main nozzle 7, the amount of air that is reflected toward the weft insertion passage S in contact with the back wall surface 18 of the reed teeth 5c decreases. Therefore, it is possible to suppress the occurrence of a malfunction in which the leading end of the weft yarn Y flies out of the weft insertion passage S due to the air reflected from the back wall surface 18 of the reed teeth 5c. On the other hand, since the boundary position P between the row of reed teeth 21 and the row of reed teeth 22 is set to the first position E1, it is possible to suppress the occurrence of end curling as in the above-described first embodiment.

In addition, the technical scope of the present invention is not limited to the above-described embodiments, and includes various modifications and improvements within the scope in which the constituent elements of the invention and specific effects obtained by combining them can be derived.

For example, in the first and third embodiments, the boundary position P between the row of reed teeth 21 and the row of reed teeth 22 is set as the first position E1, and in the second embodiment, the row of reed teeth 21 and the row of reed teeth are set as the first position E1. The boundary position P of the tooth row 22 is set to the second position E2, but the present invention is not limited to this. That is, the boundary position P between the reed tooth row 21 and the reed tooth row 22 may be set on the downstream side of the weft insertion direction X1 from the first position E1, and may be set on the weft insertion direction from the second position E2. The upstream side of X1. That is, as long as the boundary position P of the reed tooth row 21 and the reed tooth row 22 is between the first position E1 and the second position E2, it can be set at any position.

In addition, in the third embodiment, the inclination angle of the back wall surface 18 of the reed teeth 5c belonging to the reed tooth row 20 is set to substantially 0°, but the present invention is not limited to this. That is, as long as the inclination angle of the inner wall surface 18 of the reed teeth 5c satisfies the condition that it is smaller than the first inclination angle θ1, it may be set to an angle larger than 0°.

In addition, in the first embodiment, the second embodiment and the third embodiment, in the upper wall surface 16 , the lower wall surface 17 , and the inner wall surface 18 forming the concave portion 15 of the reed teeth 5 , the inner wall surface 18 is inclined, but the inner wall surface 18 is inclined. Similarly to the wall surface 18, one or both of the upper wall surface 16 and the lower wall surface 17 may be inclined.

Claims (3)

1. A weft insertion device of an air-jet loom, the weft-insertion device of the air-jet loom comprising a deforming reed, the deformable reed being oscillatingly arranged to have recesses formed by an upper wall surface, a lower wall surface, and an inner wall surface, respectively The plurality of reed teeth are arranged in the weft insertion direction to form a weft insertion passage, and alternately repeat the forward movement in the beating-up direction and the backward movement in the reverse beating-up direction, characterized in that: The plurality of reed teeth include: a first row of reed teeth, the inner wall surface of which is inclined at a first inclination angle with respect to the axis of the weft insertion passage toward a direction entering the weft insertion passage side toward the weft insertion direction ; and a second reed dentition arranged on the downstream side of the first reed dentition in the weft insertion direction, and the inner wall surface is directed toward a second inclination angle larger than the first inclination angle The weft insertion direction is inclined toward the direction entering the weft insertion passage side, When the position through which the leading end of the weft yarn passes at the timing when the swinging operation of the deforming reed is switched from the backward movement to the forward movement is set as the first position, the first reed tooth row and the second The boundary position of the row of reed teeth is set at the first position or on the downstream side of the weft insertion direction from the first position. 2. The weft insertion device of an air-jet loom according to claim 1, characterized in that, When the position at which the leading end of the weft yarn passes at the timing when the brake is started to be applied to the weft yarn flying in the weft insertion path is set as the second position, the second position is located closer to the first position than the first position. On the downstream side in the weft insertion direction, the boundary position between the first reed tooth row and the second reed tooth row is set at the second position or on the upstream side in the weft insertion direction from the second position. 3. The weft insertion device of an air-jet loom according to claim 1 or 2, characterized in that, The plurality of reed teeth include a third row of reed teeth arranged on the upstream side of the first row of reed teeth in the weft insertion direction, The inner wall surface of the reed teeth to which the third row of reed teeth belongs has a smaller inclination angle than the first inclination angle.

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