JP2020143393A - Weft insertion device for air jet loom - Google Patents

Abstract

To provide a weft insertion device for an air jet loom capable of suppressing the occurrence of end-crimping when a weft is inserted along a weft insertion passage of a modified reed.SOLUTION: A weft insertion device for an air jet loom comprises a modified reed 1 which has a weft insertion passage S formed by arranging a plurality of dents 5 each having a recessed part 15, and is disposed in such a manner as to swingably operate so as to alternately repeat forward and backward movement. The plurality of dents 5 comprises a first dent row 21 whose depth wall surface 18 is inclined at a first tilt angle θ1 to an axis J of the weft insertion passage S, and a second dent row 22 whose depth wall surface 18 is inclined at a second tilt angle θ2 larger than the first tilt angle. When a passing position of a weft tip end at a timing at which a swinging motion of the modified reed is switched from the backward movement to the forward movement is defined as a first position E1, a boundary position P between the first dent row 21 and the second dent row 22 is set as the first position E1.SELECTED DRAWING: Figure 4

Description

The present invention relates to a wefting device for an air jet loom.

The air jet loom is equipped with a wefting device that causes the weft to fly and weft by injecting air from a nozzle. The wefting device is provided with a deformed reed. The deformed reed is configured by arranging a large number of reed wings having recesses for forming a wefting passage in the wefting direction. The weft passage is a passage for causing the weft to fly on the flow of air blown from the nozzle to the weft passage.

Further, the wefting device of the air jet loom is provided with a main nozzle and a plurality of sub nozzles. The plurality of sub-nozzles inject air by a relay method in order to assist the weft threads to fly by injecting air from the main nozzle. Each sub-nozzle blows air diagonally to the weft passage. At that time, a part of the air blown from the sub-nozzle to the wefting passage leaks to the back side of the deformed reed through the gap between the reeds. Such air leakage leads to a decrease in the amount of air that contributes to the flight of the weft, which causes a decrease in the flight speed of the weft.

Therefore, in the conventional deformed reed, a technique of inclining the inner wall surface of the recess is adopted in each reed. Specifically, the inner wall surface of the recess is inclined in the direction of entering the wefting passage side toward the wefting direction. When the back wall surface of the recess is tilted in this way, the amount of air that hits the back wall surface of the recess and is reflected toward the weft passage side increases when air is blown from the sub-nozzle toward the weft passage. Therefore, the amount of air leaking between the reeds can be reduced.

As a modified reed of this type, Patent Document 1 describes the inclination angle of the back wall surface of the reeds belonging to the reed row arranged in the section near the main nozzle among the plurality of reeds arranged in the wefting direction. , A deformed reed that is set smaller than the inclination angle of the back wall surface of the reed feathers belonging to the reed feather row arranged in the section opposite to the main nozzle is described. When this deformed reed is adopted, the amount of air reflected from the back wall surface of the reed blade to the weft passage side is reduced in the section near the main nozzle, which is greatly affected by the air blown from the main nozzle. Therefore, it is possible to suppress the occurrence of troubles such as the tip of the weft thread jumping out of the wefting passage due to the air reflected from the back wall surface of the reed feather.

Japanese Unexamined Patent Publication No. 5-86544

One of the troubles that occurs in air jet looms is "end tiny". End fluttering is a phenomenon in which the tip of the weft enters between the reeds and comes into contact with the reed while flying through the weft passage, which makes the flying state of the weft unstable and the tip of the weft flutters. .. End flicker is more likely to occur when the tip of the weft is affected by the swinging motion of the deformed reed and approaches the inner wall surface of the reed (details will be described later). However, since the technique described in Patent Document 1 is not configured in consideration of the influence of the swinging motion of the deformed reed, it is not possible to suppress the occurrence of end shrinkage.

The present invention has been made to solve the above problems, and an object of the present invention is an air jet loom capable of suppressing the occurrence of end flicker when wefting weft threads along the wefting passage of a deformed reed. Is to provide a weaving device.

In the wefting device of the air jet loom according to the present invention, a plurality of reed wings having recesses formed by the upper wall surface, the lower wall surface and the back wall surface are arranged in the wefting direction to form a wefting passage, and the reeds are formed. It is a wefting device for an air-jet loom equipped with a deformable reed that can swing so as to alternately repeat forward movement in the striking direction and backward movement in the anti-reed striking direction. , The first reed row that is inclined in the direction of entering the wefting passage side as the back wall surface is inclined toward the wefting direction at the first inclination angle with respect to the axis of the wefting passage, and the first in the wefting direction. A second reed that is arranged on the downstream side of the reed row and is inclined in the direction of entering the wefting passage side as the back wall surface is inclined toward the wefting direction at a second inclination angle larger than the first inclination angle. When the position where the tip of the weft passes at the timing when the swinging motion of the deformed reed is switched from the backward movement to the forward movement, including the wing row, is set as the first position, the first reed wing row and the second The boundary position with the reed feather row is set to the first position or the downstream side in the wefting direction.

In the wefting device of the air jet loom according to the present invention, when the position where the tip of the weft passes at the timing when the brake is started to be applied to the weft flying in the weft passage is set as the second position, the second position. Is located downstream of the first position in the wefting direction, and the boundary position between the first reed row and the second reed row is the second position or the upstream side in the wefting direction. It may be set to.

In the wefting device of the air jet loom according to the present invention, the plurality of reed feathers include a third reed feather row arranged upstream of the first reed feather row in the wefting direction, and the third reed feathers. The back wall surface of the reed feathers belonging to the row may have an inclination angle smaller than the first inclination angle.

According to the present invention, when the weft thread is wefted along the wefting passage of the deformed reed, the occurrence of end flicker can be suppressed.

It is a side sectional view which shows the wefting apparatus of the air jet loom which concerns on embodiment of this invention. It is a schematic front view which shows the weft insertion apparatus of the air jet loom which concerns on embodiment of this invention. It is a main part perspective view which shows the weft insertion apparatus of the air jet loom which concerns on embodiment of this invention. FIG. 5 is a cross-sectional view of the deformed reed according to the first embodiment of the invention at the DD position of FIG. It is a figure which shows the relationship between the angular velocity of a reed and the machine base angle in the swinging motion of a deformed reed. It is a figure which shows the change of the position of the weft tip in 1st Embodiment of this invention. It is a figure which shows the measurement result of the wind pressure value in the weft passage when the deformed reed according to 1st Embodiment of this invention is used. It is a figure which shows the air which flows between the reeds when the deformed reed moves backward. It is a figure which shows the air which flows between the reeds when the deformed reed moves forward. It is a figure which shows how the tip of a weft is pulled in between reeds. FIG. 5 is a cross-sectional view of the deformed reed according to the second embodiment of the invention at the DD position of FIG. It is a figure which shows the change of the position of the weft tip in the 2nd Embodiment of this invention. It is a figure which shows the measurement result of the wind pressure value in the weft passage when the deformed reed according to the 2nd Embodiment of this invention is used. FIG. 5 is a cross-sectional view of a modified reed according to a third embodiment of the present invention at the DD position of FIG. It is a figure which shows the measurement result of the wind pressure value in the weft passage when the deformed reed according to the 3rd Embodiment of this invention is used.

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

(First Embodiment)
FIG. 2 is a side sectional view showing a wefting 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 wefting device of the air jet loom includes a deformable reed 1. The deformed reed 1 is attached to the sley 2. The deformed reed 1 includes a pair of upper and lower reinforcing members 3 and 4, and a plurality of reed wings 5 held by the reinforcing members 3 and 4. The deformed reed 1 is a long member having a weaving width direction as a longitudinal direction. The plurality of reed wings 5 are arranged at predetermined intervals in the longitudinal direction X of the deformed reed 1. A gap for passing the warp T is provided between the reeds 5 adjacent to each other in the longitudinal direction X of the deformed reed 1. Of the pair of reinforcing members 3 and 4, the upper reinforcing member 3 sandwiches the upper edge portions of the plurality of reed wings 5, and the lower reinforcing member 4 sandwiches the lower edge portions of the plurality of reed wings 5. .. Further, the lower reinforcing member 4 is fixed to the sley 2 by the fixing member 6.

In the wefting direction X1, the main nozzle 7 is arranged on the upstream side of the deformed reed 1. The wefting direction X1 is the direction in which the weft yarn Y advances when the weft yarn Y is wefted by the air injected from the main nozzle 7. The main nozzle 7 is a nozzle for wefting the weft Y into the opening portion of the warp 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 deformed reed 1. When the weft Y is caused to fly by injecting air from the main nozzle 7, these sub-nozzles 8 inject air in a relay system to assist the weft Y in flying. Each sub-nozzle 8 is attached to the sley 2 via a nozzle support member 9. The nozzle support member 9 is fixed to the sley 2 by using bolts 11 and nuts 12.

Recesses 15 are formed on the front surfaces of the plurality of reed wings 5, respectively. The recess 15 is formed by an upper wall surface 16, a lower wall surface 17, and a back wall surface 18. The side of the recess 15 facing the back wall surface 18 is open. The back wall surface 18 is a surface including at least the wall surface located on the innermost side when the recess 15 of the reed feather 5 is viewed from the opening side (front side). In the deformed reed 1, a weft passage S is formed by recesses 15 formed in each reed wing 5. The wefting passage S is a passage formed by a row of recesses 15 of each reed wing 5 by arranging a plurality of reed wings 5 in the wefting direction X1. The axis J passing through the center of the wefting passage 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 sub-nozzle 8 blows air As diagonally with respect to the axis J of the wefting passage S.

The deformable reed 1 is provided so as to be able to swing by a swing mechanism (not shown). The swinging motion of the deformed reed 1 is an motion performed for striking the reed. The deformed reed 1 swings so as to alternately repeat forward movement in the reed strike direction F and backward movement in the anti-reed strike direction R. Then, the reed beating by the deformed reed 1 is performed when the deformed reed 1 moves forward.

FIG. 4 is a cross-sectional view of the deformed reed according to the first embodiment of the present invention at the DD position of FIG.
As shown in FIG. 4, the plurality of reed wings 5 are divided into two reed wings rows 21 and 22 in the longitudinal direction X of the deformed reed 1. The reed row 21 corresponds to the first reed row, and the reed row 22 corresponds to the second reed row. The reed row 21 is composed of a plurality of reed wings 5a arranged in the longitudinal direction X of the deformed reed 1, and the reed row 22 is composed of a plurality of reed wings 5b arranged in the longitudinal direction X of the deformed reed 1. Has been done. The reed row 22 is arranged on the downstream side of the reed row 21 in the wefting direction X1. Further, the reed feather 5a arranged on the most downstream side in the reed feather row 21 and the reed feather 5b arranged on the most upstream side in the reed feather row 22 are arranged next to each other in the wefting direction X1. There is.

The back wall surface 18 of the reed feather 5a belonging to the reed feather row 21 is inclined in the direction of entering the wefting passage S side toward the wefting direction X1, and the back wall surface 18 of the reed feather 5b belonging to the reed feather row 22 is also wefted. It is inclined in the direction of entering the wefting passage S side toward the insertion direction X1. Further, the back wall surface 18 of the reed feather 5a belonging to the reed feather row 21 is inclined at a first inclination angle θ1 with respect to the axis J of the wefting passage S. On the other hand, the back wall surface 18 of the reed feathers 5b belonging to the reed feather row 22 is inclined at a second inclination angle θ2 larger than the first inclination angle θ1 with respect to the axis J of the weft passage S. Further, in the reed feather row 21, the back wall surface 18 of each reed feather 5a is inclined at a common inclination angle θ1, and in the reed feather row 22, the back wall surface 18 of each reed feather 5b is inclined at a common inclination angle θ2. Is tilted at.

Further, the boundary position P between the reed row 21 and the reed row 22 is set as follows.
First, when air is injected from the main nozzle 7 and the plurality of sub-nozzles 8 at predetermined timings to make the weft Y fly, the weft Y moves in the weft direction X1 along with the air flow. At this time, assuming that the position where the tip of the weft Y is passed 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 rows 21 and 22 is set. It is set to the first position E1. The first position E1 is a position specified based on the design of the wefting device, experimental data when the wefting device is operated, simulation results of the wefting device, and the like. Hereinafter, the setting of the boundary position P of the reed row 21 and 22 will be described in more detail.

FIG. 5 is a diagram showing the relationship between the angular velocity of the reed and the platform angle in the swinging motion of the deformed reed.
The angular velocity of the reed may take a negative value or a positive value depending on the moving direction when the deformed reed 1 swings. 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 “backward movement period”). The reverse movement period is a period in which the machine base angle is 0 ° to 180 °. On the other hand, the period during which the angular velocity of the reed takes a positive value is the period during which the deformed reed 1 moves forward (hereinafter, also referred to as “forward movement period”). The forward movement period is a period in which the machine base angle is 180 ° to 360 °. In this case, the timing at which the deformed reed 1 switches from the backward movement to the forward movement is when the machine base angle is 180 °. The timing at which the deformed reed 1 switches from the backward movement to the forward movement may be shifted before or after the time when the machine base angle is 180 ° due to the design of the wefting device.

On the other hand, the period in which the weft Y is inserted (hereinafter referred to as "wefting period") Ta is a period in which the machine base angle is 80 ° to 240 °. Therefore, the intermediate time point of the wefting period Ta is the time point when the machine base angle is 160 °, that is, the time point when the deformation reed 1 is moving backward. Therefore, when the tip of the weft Y is moved in the longitudinal direction X of the deformed reed 1 during the weft period Ta, the position where the tip of the weft Y passes at the midpoint of the weft period Ta is the intermediate position C in FIG. Then, the boundary position P between the reed row 21 and the reed row 22 is set downstream of the intermediate position C in the wefting direction X1. The start time and end time of the wefting period Ta may be set out of the range of the above-mentioned machine base angle due to the design of the wefting device.

FIG. 6 is a diagram showing a change in the position of the weft tip 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 base angle. The longitudinal position of the deformed reed has 0 at the start of wefting. The starting end of the wefting refers to the end of the deformed reed on the side where the main nozzle is arranged in the longitudinal direction of the deformed reed.

As shown in FIG. 6, the tip of the weft is from the time of the machine base angle = 80 ° at the start of the wefting period Ta to the time of the machine base angle = 240 ° at the end of the wefting period Ta. Move in the longitudinal direction of the deformed reed. Further, the tip of the weft thread passes through the first position E1 in the longitudinal direction of the deformed reed when the machine base angle = 180 °. The boundary position P between the reed row 21 and the reed row 22 is set in accordance with the first position E1 (see FIG. 4).

When the boundary position P between the reed row 21 and the reed row 22 is set to the first position E1 in this way, the measurement result of the wind pressure value (cmAq) in the weft passage S is as shown in FIG. The wind pressure value is measured while the deformed reed 1 is stopped without swinging. As a measurement procedure, first, a sub-nozzle for wind pressure measurement is arranged at a distance of 50 mm from the wind pressure measurement point on the upstream side of the weft insertion direction X1 with respect to the wind pressure measurement point in the weft insertion passage S of the deformed reed 1. .. Next, while blowing a certain amount of air from the sub-nozzle for wind pressure measurement toward the wefting passage S, the position of the sub-nozzle for wind pressure measurement is moved in the longitudinal direction X of the deformation reed 1, and the wefting passage is moved during this movement. The wind pressure value at the wind pressure measurement point in S is measured by the sensor. At that time, the position of the wind pressure measurement point moves according to the movement of the sub-nozzle for wind pressure measurement. Looking at the measurement results, the wind pressure value in the wefting passage S is a constant value L1 from the start of wefting to the first position E1, but increases by ΔL after passing the first position E1. , From there to the end of wefting, there is a constant value L2.

The reason why the wind pressure value in the weft passage S changes in this way is as follows.
First, in the longitudinal direction X of the deformed reed 1, the reed row 21 is located closer to the start end side of the wefting than the first position E1, and the reed row 22 is located at the end of the wefting than the first position E1. Located on the side. Further, the back wall surface 18 of the reed feather 5a belonging to the reed feather row 21 is inclined at the first inclination angle θ1, and the back wall surface 18 of the reed feather 5b belonging to the reed feather row 22 is larger than the first inclination angle θ1. It is tilted at an inclination angle θ2 of 2. When air is blown from the sub-nozzle for measuring the wind pressure toward the weft passage S, the wind pressure value in the weft passage S increases as the inclination angle of the back wall surface 18 of the reed blade 5 increases. This is because when air is blown from the sub-nozzle for wind pressure measurement toward the wefting passage S, the amount of air that hits the back wall surface 18 of the reed feather 5 and is reflected toward the wefting passage S is the inclination angle of the back wall surface 18. This is because the wind pressure value in the weft passage S increases due to the increase in the amount of air. Therefore, the wind pressure value in the wefting passage S becomes larger by ΔL at the end side of the wefting than the first position E1 in the longitudinal direction X of the deformed reed 1. As shown in FIG.

Subsequently, the technical significance of setting the boundary position P between the reed row 21 and the reed row 22 to the first position E1 will be described.
First, when the deformed reed 1 is swung, the movement of the deformed reed 1 in this swinging motion causes an air flow between the reed wings 5. Specifically, as shown in FIG. 8, when the deformed reed 1 is moving in the anti-reeding direction R, air A flows between the reed wings 5 in the direction opposite to the moving direction R. .. Further, as shown in FIG. 9, when the deformed reed 1 is moving in the reed striking direction F, air A flows between the reed wings 5 in the direction opposite to the moving direction F.

On the other hand, when air is blown from each sub-nozzle 8 toward the weft passage S, a part of this air leaks to the rear side of the deformed reed 1 through the gap between the reed wings 5. At that time, the amount of air leaking through the reed wings 5 differs depending on whether the deformed reed 1 is moving in the anti-reed direction R or the deformed reed 1 is moving in the reed direction F. The reason is as follows.

First, when the deformed reed 1 is moving in the anti-reed direction R, the air A (see FIG. 8) flowing between the reed wings 5 is blown from each sub-nozzle 8 toward the weft passage S. It works to suppress the leakage of As. Therefore, the amount of air leaking to the rear side B of the deformed reed 1 is reduced. On the other hand, when the deformed reed 1 is moving in the reed direction F, the air A (see FIG. 9) flowing between the reed wings 5 is blown from each sub-nozzle 8 toward the weft passage S. It works to promote the leakage of air As. Therefore, the amount of air leaking to the rear side B of the deformed reed 1 increases.

Here, if only the reed wing row 21 is arranged in the entire longitudinal direction X of the deformed reed 1, the air A (see FIG. 9) flowing between the reeds 5 due to the forward movement of the deformed reed 1 causes FIG. As shown, the tip of the weft Y approaches the back wall surface 18 and is easily drawn between the reed wings 5. When the tip of the weft Y is pulled between the reed wings 5, the tip of the weft Y comes into contact with the reed feather 5 and the flying state becomes unstable, and the tip side of the weft Y is wavy, that is, the end is broken. It will occur.

In the first embodiment, the boundary position P between the reed row 21 and the reed row 22 is set to the first position E1. The first position E1 is a position where the tip of the weft thread Y passes at the timing when the swinging motion of the deformed reed 1 is switched from the backward movement to the forward movement. Therefore, the tip of the weft Y passes through the section of the reed row 21 when the deformed reed 1 is moving backward, and passes through the section of the reed row 22 when the deformed reed 1 is moving forward. .. Further, in the first embodiment, the back wall surface 18 of the reed feathers 5b belonging to the reed feather row 22 is tilted at a second tilt angle θ2 larger than the first tilt angle θ1. Therefore, on the terminal side of the wefting from the boundary position P between the reed row 21 and the reed row 22, the air blown from the sub-nozzle 8 hits the back wall surface 18 of the reed feather 5b and is on the wefting passage S side. The amount of reflected air increases. Therefore, when the tip of the weft thread Y passes through the end side of the wefting from the boundary position P, the weft thread Y becomes difficult to approach the back wall surface 18 due to the increase in the amount of air reflected from the back wall surface 18 of the reed feather 5b. As a result, even during the forward movement period of the deformed reed 1, the tip of the thread Y is less likely to be sucked between the reed wings 5b, so that the occurrence of end flicker can be suppressed. Further, since the amount of air leaking to the rear side of the deformed reed 1 through the gap between the reed blades 5b is reduced on the terminal side of the wefting from the boundary position P, it is possible to suppress the decrease in the flight speed due to the air leakage. it can.

Further, when the boundary position P between the reed row 21 and the reed row 22 is set on the upstream side of the wefting direction X1 from the first position E1, the tip of the weft Y is moved backward while the deformed reed 1 is moving backward. It will reach the reed row 22. In that case, the momentum of the air reflected from the back wall surface 18 of the reed feathers 5b belonging to the reed feather row 22 toward the weft passage S side is the air A flowing between the reed feathers 5 due to the backward movement of the deformed reed 1 (see FIG. 8). Strengthened by. Therefore, the trouble that the tip of the weft thread Y pops out from the wefting passage S is likely to occur. On the other hand, when the boundary position P between the reed row 21 and the reed row 22 is set to the first position E1, the tip of the weft Y does not reach the reed row 22 during the backward movement of the deformed reed 1. Therefore, it is possible to suppress the occurrence of a trouble that the tip of the weft thread Y jumps out from the weft insertion passage S.

(Second Embodiment)
Next, the second embodiment of the present invention will be described.
First, the effect obtained by the first embodiment can be obtained even when the boundary position P between the reed row 21 and the reed row 22 is set downstream of the first position E1 in the wefting direction X1. .. However, in that case, it is necessary to set the boundary position P between the reed row 21 and the reed row 22 in consideration of the braking process performed after the tip of the weft Y has passed the first position E1. .. The details will be described below.

First, in the wefting device of the air jet loom, when air is injected from the main nozzle 7 and the plurality of sub nozzles 8 at predetermined timings to make the weft Y fly, the weft Y in flight is braked. In some cases. The timing at which the brake is started on the weft Y is later than the timing at which the swinging motion of the deformed reed 1 is switched from the backward movement to the forward movement. Therefore, assuming that the position where the tip of the weft thread Y passes at the timing when the brake is applied to the weft thread Y during flight is set to the second position E2, the second position E2 is in the wefting direction rather than the first position E1. The position is shifted to the downstream side of X1.

When the brake is applied to the weft thread Y during flight, the flight speed of the weft thread Y decreases and the straightness of the weft thread Y weakens, so that the tip of the weft thread Y is easily sucked between the reed wings 5. Therefore, in the second embodiment, as shown in FIG. 11, the reed is difficult to be sucked between the reed wings 5 even if the tip of the weft Y passes through the second position E2. The boundary position P between the wing row 21 and the reed wing row 22 is set to the second position E2. The second position E2 is a position specified based on the design of the wefting device, experimental data when the wefting device is operated, simulation results of the wefting device, and the like.

FIG. 12 is a diagram showing a change in the position of the weft tip in the second embodiment of the present invention.
As shown in FIG. 12, the tip of the weft is deformed from the time of the machine base angle = 80 ° at the start of the wefting period to the time of the machine base angle = 240 ° at the end of the wefting period. Move in the longitudinal direction of. Further, the tip of the weft passes through the first position E1 in the longitudinal direction of the deformed reed when the machine base angle = 180 °, and the second tip of the weft thread passes through the first position E1 in the longitudinal direction of the deformed reed when the machine base angle = 205 °. Passes through position E2. Then, after the tip of the weft passes through the second position E2, the rate of change in the position of the tip of the weft becomes small. This is because the brake is applied to the weft at the timing when the tip of the weft passes through the second position E2, which reduces the flying speed of the weft. The boundary position P between the reed row 21 and the reed row 22 is set in accordance with the second position E2.

When the boundary position P between the reed row 21 and the reed row 22 is set to the second position E2 in this way, the measurement result of the wind pressure value (cmAq) in the weft passage S is as shown in FIG. , The value L1 is constant from the start of wefting to the second position E2, increases by ΔL after passing the second position E2, and becomes a constant value L2 from there to the end of wefting. This measurement result shows that the amount of air reflected on the back wall surface 18 of the reed blade 5b of the reed row 22 on the end side of the wefting from the second position E2 is on the starting end side of the wefting than the second position E2. This means that the amount of air reflected on the back wall surface 18 of the reed feathers 5a of the reed feather row 21 is larger than the amount of air reflected.

Subsequently, the technical significance of setting the boundary position P between the reed row 21 and the reed row 22 at the second position E2 will be described.
First, when the deformed reed 1 is swung, as shown in FIGS. 8 and 9, a flow of air A is generated between the reed wings 5 according to the moving direction of the deformed reed 1. At that time, the air A (see FIG. 9) flowing between the reed wings 5 due to the movement of the deformed reed 1 in the reed striking direction F promotes the leakage of air blown from each sub-nozzle 8 toward the weft passage S. Work like. However, at the timing when the swinging motion of the deformed reed 1 is switched from the backward movement to the forward movement, the moving speed of the deformed reed 1 becomes substantially zero, and the deformed reed 1 starts the forward movement from that state. Therefore, during the period from the start of the forward movement of the deformed reed 1 until the moving speed of the deformed reed 1 is sufficiently increased, the influence of the forward movement of the deformed reed 1 on the flying state of the weft Y is small. Therefore, even if the boundary position P between the reed row 21 and the reed row 22 is set to be shifted to the end side of the wefting from the first position E1, there is a great difference in the effect of suppressing the occurrence of end flicker. Does not occur. However, when the tip of the weft Y passes through the second position E2, the brake is applied to the weft Y and the flying speed of the weft Y decreases, so that the tip of the weft Y is easily sucked between the reed wings 5. On the other hand, when the boundary position P between the reed feather row 21 and the reed feather row 22 is set to the second position E2, the back wall surface of the reed feather 5b is located on the terminal side of the wefting from the second position E2. At 18, the amount of air reflected on the weft passage S side increases. Therefore, even if the tip of the weft Y passes through the second position E2, the tip of the weft Y is less likely to be sucked between the reed wings 5b. Therefore, it is possible to suppress the occurrence of end shrinkage.

(Third Embodiment)
Subsequently, the third embodiment of the present invention will be described.
In the third embodiment of the present invention, as shown in FIG. 14, a plurality of reed wings 5 are divided into three reed feather rows 20, 21, 22 in the longitudinal direction X of the deformed reed 1. It is different from the first embodiment. The reed row 21 corresponds to the first reed row, the reed row 22 corresponds to the second reed row, and the reed row 20 corresponds to the third reed row. The reed feather row 20 is composed of a plurality of reed feathers 5c arranged in the longitudinal direction X of the deformed reed 1. The reed row 20 is arranged on the upstream side of the reed row 21 in the wefting direction X1. The boundary position P0 between the reed row 20 and the reed row 21 is set closer to the main nozzle 7 than the boundary position P between the reed row 21 and the reed row 22.

Of the three reed row rows 20, 21 and 22, the back wall surface 18 of the reed feather 5a belonging to the reed feather row 21 is inclined at the first inclination angle θ1, and the back wall surface 18 of the reed feather 5b belonging to the reed feather row 22. Is inclined at the second inclination angle θ2, and this point is the same as that of the first embodiment. On the other hand, the back wall surface 18 of the reed feathers 5c belonging to the reed feather row 20 has a third inclination angle smaller than the first inclination angle θ1 with respect to the axis J of the wefting passage S, specifically, the inclination angle is substantially the same. Is set to 0 °.

In this way, when the reed feather row 20 is arranged near the main nozzle 7 and the inclination angle of the back wall surface 18 of the reed feather 5c belonging to the reed feather row 20 is set small, the wind pressure value in the weft passage S is set to be small. The measurement result of (cmAq) is as shown in FIG. That is, the wind pressure value in the wefting passage S becomes a constant value L0 from the start of the wefting to the E0 position, increases by ΔL1 after the E0 position, and is a constant value L1 from there to the first position E1. It becomes. Further, the wind pressure value in the wefting passage S increases by ΔL after passing the first position E1, and becomes a constant value L2 from there to the end of the wefting. This measurement result shows that the amount of air reflected by the reed wing 5c of the reed wing row 20 on the start end side of the wefting from the E0 position and hitting the back wall surface 18 of the reed wing row 20 is on the reed wing row 21 on the ending side of the wefting from the E0 position. It means that the amount of air reflected on the back wall surface 18 of the reed feather 5a is smaller than the amount of air reflected. Further, in the above measurement result, the amount of air reflected by the reed wing 5b of the reed wing row 22 at the end side of the wefting from the first position E1 is more wefted than the first position E1. This means that the amount of air reflected on the back wall surface 18 of the reed feather 5a of the reed feather row 21 on the starting end side is larger than the amount of air reflected.

When the reed row 20 is arranged near the main nozzle 7, the air injected from the main nozzle 7 is in a flying state of the weft Y when the tip of the weft Y passes through the section of the reed row 20. Has a great influence on. Therefore, if the inclination angle of the back wall surface 18 of the reed feathers 5c belonging to the reed feather row 20 is set to be large, the air injected from the main nozzle 7 hits the back wall surface 18 of the reed feathers 5c and is on the weft passage S side. The amount of air reflected on the surface increases. Then, the trouble that the tip of the weft Y is popped out from the weft passage S is likely to occur.

Therefore, in the third embodiment, the inclination angle of the back wall surface 18 of the reed feathers 5c belonging to the reed feather row 20 is set small. Therefore, when the tip of the weft Y is passed through the section of the reed row 20 due to the injection of air from the main nozzle 7, the amount of air that hits the back wall surface 18 of the reed 5c and is reflected toward the weft passage S side is small. Become. Therefore, it is possible to suppress the occurrence of troubles such as the tip of the weft thread Y jumping out of the wefting passage S due to the air reflected from the back wall surface 18 of the reed feather 5c. On the other hand, since the boundary position P between the reed row 21 and the reed row 22 is set to the first position E1, it is possible to suppress the occurrence of end shrinkage as in the first embodiment.

The technical scope of the present invention is not limited to the above-described embodiment, but also includes a form in which various changes and improvements are made within a range in which a specific effect obtained by the constituent requirements of the invention or a combination thereof can be derived. ..

For example, in the first embodiment and the third embodiment, the boundary position P between the reed row 21 and the reed row 22 is set to the first position E1, and in the second embodiment, the reed row 21 and the boundary position P are set. The boundary position P with the reed 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 row 21 and the reed row 22 may be set downstream of the first position E1 in the wefting direction X1 and may be wefted more than the second position E2. It may be set on the upstream side of the direction X1. That is, the boundary position P between the reed row 21 and the reed row 22 may be set to any position as long as it is between the first position E1 and the second position E2.

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

Further, in the first embodiment, the second embodiment, and the third embodiment, the back wall surface 18 of the upper wall surface 16, the lower wall surface 17, and the back wall surface 18 forming the recess 15 of the reed feather 5 is inclined. However, as with the back wall surface 18, one or both of the upper wall surface 16 and the lower wall surface 17 may be inclined.

1 deformed reed, 5,5a, 5b, 5c reed, 15 recess, 16 upper wall, 17 lower wall, 18 back wall, 20 reed row (third reed row), 21 reed row (first reed row) Reed row), 22 Reed row (second reed row), E1 1st position, E2 2nd position, F reed direction, P boundary position, R anti-reed direction, X1 wefting direction, S Wefting passage, θ1 first inclination angle, θ2 second inclination angle.

Claims (3)

A plurality of reed wings having recesses formed by the upper wall surface, the lower wall surface, and the back wall surface are arranged in the wefting direction to form a wefting passage, and forward movement in the reeding direction and anti-reeding direction. It is a wefting device for an air-jet loom equipped with a deformable reed that can be swung so as to alternately repeat backward movement.
The plurality of reed feathers are the first reed feather row inclined in the direction of entering the wefting passage side as the back wall surface toward the wefting direction at the first inclination angle with respect to the axis of the wefting passage. , The weaving direction is arranged on the downstream side of the first reed row, and the wefting is carried out as the back wall surface has a second inclination angle larger than the first inclination angle toward the wefting direction. Includes a second row of reeds sloping in the direction of entry into the aisle
When the position where the tip of the weft passes at the timing when the swinging motion of the deformed reed is switched from the backward movement to the forward movement is set as the first position, the first reed row and the second reed An air jet loom weaving device in which the boundary position with the wing row is set at the first position or on the downstream side in the wefting direction. When the position where the tip of the weft passes at the timing when the brake is started to be applied to the weft flying in the weft passage is set as the second position, the second position is higher than the first position. It is located on the downstream side in the direction, and the boundary position between the first reed row and the second reed row is set to the second position or the upstream side in the wefting direction. , The wefting device for an air jet loom according to claim 1. The plurality of reed feathers include a third reed feather row arranged on the upstream side of the first reed feather row in the wefting direction.
The weaving device for an air jet loom according to claim 1 or 2, wherein the back wall surface of the reed blades belonging to the third reed blade row has an inclination angle smaller than that of the first inclination angle.

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