CN114808244A

CN114808244A - Weft insertion device of air jet loom

Info

Publication number: CN114808244A
Application number: CN202210054006.1A
Authority: CN
Inventors: 垣内夏树; 牧野洋一; 森田光飞; 横山铁夫; 滨口真崇
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2021-01-29
Filing date: 2022-01-18
Publication date: 2022-07-29
Anticipated expiration: 2042-01-18
Also published as: JP2022116513A; CN114808244B; EP4036292A1; EP4036292B1

Abstract

The pressure drop of the compressed air at the time of starting and the pressure fluctuation of the compressed air at the time of operation are suppressed to be smaller than those of the conventional cases. A weft insertion device (100) is provided with: a1 st main tank (144M) that stores compressed air; an electro-pneumatic regulator (143) that adjusts the pressure of compressed air supplied from the air compressor (10) and supplies the adjusted compressed air to the 1 st main tank (144M); a nozzle (142) that injects compressed air; a main valve (146) that is connected to the 1 st main tank (144M) via the 1 st connection section (P144) and that supplies compressed air stored in the 1 st main tank (144M) to the nozzle; and a2 nd main tank (144S) connected to the 1 st main tank (144M) via a2 nd connection (P143S) different from the 1 st connection (P144).

Description

Weft insertion device of air jet loom

Technical Field

The present invention relates to a weft insertion device for an air jet loom using compressed air for weft yarn running, and more particularly to a weft insertion device for an air jet loom capable of suppressing a decrease in pressure of compressed air at the time of starting and a variation in pressure of compressed air at the time of operation.

Background

An air jet loom performs weaving by running a weft yarn in a direction orthogonal to a warp yarn by jetting compressed air. Here, in terms of a woven fabric having good knitting quality, it is important to constantly maintain the pressure of the compressed air and to make the weft reach a predetermined weft insertion position at a predetermined time point.

Patent document 1: japanese patent laid-open publication No. 2015-86476

Patent document 1 describes: a method of controlling the pressure of compressed air in a tank using an electro-pneumatic regulator in order to control the pressure of compressed air ejected from a nozzle in an air jet loom. The method described in patent document 1 aims to suppress pressure fluctuations of compressed air in a tank by appropriately setting a lower limit pressure that determines an operating time point of an air supply solenoid valve of an electro-pneumatic regulator.

However, there are problems as follows: in the case where the pressure of the compressed air in the tank is controlled using the electro-pneumatic regulator, if the flow rate of the compressed air injected from the nozzle is increased, the pressure drop at the time of starting in the tank is increased.

Fig. 5 shows the characteristic of the pressure change when the flow rate of the compressed air injected from the nozzle is set to the standard state, and fig. 6 shows the characteristic of the pressure change when the flow rate of the compressed air injected from the same nozzle is set to the maximum.

Comparing the characteristics of fig. 5 with those of fig. 6, it is understood that a significant pressure drop at startup, which does not occur in fig. 5, occurs in the characteristics of fig. 6. Such a pressure reduction at startup is considered to be due to: since a large flow rate of compressed air is used at the time of starting, it is not time to supplement compressed air in the tank from a compressed air supply source such as an air compressor via an electro-pneumatic regulator.

On the other hand, it is conceivable to reduce the volume of the tank in order to suppress a decrease in the pressure in the tank at the time of startup. Fig. 7 shows the pressure change characteristics when the volume of the tank is 1/2 before being changed and the flow rate of the compressed air injected from the nozzle is set to be maximum. The pressure decrease amount at startup in fig. 7 improves to β smaller than α shown in fig. 6.

However, while the pressure fluctuation during operation is γ in fig. 6, the pressure fluctuation during operation is deteriorated to δ larger than γ in fig. 7. That is, the pressure drop at the time of startup is suppressed by reducing the volume of the tank, but the pressure fluctuation at the time of operation is worsened. Further, the electro-pneumatic regulator hardly operates immediately after the start-up in fig. 6 and thereafter, whereas the operation of supplying and exhausting air is frequently performed in the operation in fig. 7. Frequent operations of the electro-pneumatic actuator shown in fig. 7 may shorten the life of the electro-pneumatic actuator.

Therefore, in a weft insertion device for running a weft by compressed air ejected from a nozzle, there are problems as follows: it is extremely difficult to suppress both the pressure drop at the start of the compressed air in the tank and the pressure fluctuation of the compressed air at the operation.

Disclosure of Invention

The invention aims to provide a weft insertion device of an air jet loom, which can reduce the pressure reduction of compressed air during starting and the pressure variation of the compressed air during operation to be smaller than the conventional weft insertion device.

The weft insertion device of an air jet loom of the present invention comprises: a1 st tank storing compressed air; an electro-pneumatic regulator that adjusts the pressure of compressed air supplied from the air compressor and supplies the compressed air to the 1 st tank; a nozzle that injects compressed air; a valve connected to the 1 st tank via the 1 st connection part and supplying the compressed air stored in the 1 st tank to the nozzle; and a2 nd tank connected to the 1 st tank via a2 nd connection part different from the 1 st connection part.

The 2 nd connecting portion may be connected to a supply portion for supplying compressed air from the electro-pneumatic regulator to the 1 st tank.

Alternatively, the 2 nd connecting part may be directly connected to the 1 st tank.

When the volume of the 1 st tank is V1 and the volume of the 2 nd tank is V2, V1 < V2 may be satisfied.

When the flow path resistance of the supply portion for supplying compressed air from the electro-pneumatic regulator to the 1 st tank is R1 and the flow path resistance of the 2 nd connecting portion is R2, R1 < R2 may be satisfied.

According to the weft insertion device of the air jet loom of the present invention, the pressure drop of the compressed air at the time of starting and the pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than the conventional ones.

Drawings

Fig. 1 is a configuration diagram showing a configuration of a weft insertion device according to an embodiment.

Fig. 2 is a configuration diagram showing a configuration of a main regulator of the weft insertion device according to the embodiment.

Fig. 3 is a configuration diagram showing the configurations of the 1 st main tank and the 2 nd main tank of the weft insertion device according to the embodiment.

Fig. 4 is an explanatory diagram showing the flow of compressed air in the tank of the weft insertion device according to the embodiment.

Fig. 5 is a characteristic diagram showing pressure characteristics of compressed air of a comparative example.

Fig. 6 is a characteristic diagram showing the pressure characteristics of the compressed air of the comparative example.

Fig. 7 is a characteristic diagram showing the pressure characteristics of the compressed air of the comparative example.

Fig. 8 is a characteristic diagram showing pressure characteristics of compressed air according to the embodiment.

Fig. 9 is a configuration diagram showing a1 st modification of the tank of the weft insertion device according to the embodiment.

Fig. 10 is a configuration diagram showing a2 nd modification of the tank of the weft insertion device according to the embodiment.

Fig. 11 is a configuration diagram showing a3 rd modification of the tank of the weft insertion device according to the embodiment.

Description of the reference numerals

An air compressor; a weft insertion device; a control portion; a CPU; a functional panel; a yarn feeding portion; a weft length measuring and storing part; storing the drum; a weft yarn unwinding pin; a balloon sensor; a weft insertion nozzle; a tandem nozzle; a primary nozzle; a master regulator (electro-pneumatic regulator); 144m.. 1 st main tank (1 st tank); 144s.. 2 nd main tank (2 nd tank); a pressure sensor; a series valve; a main valve; a brake; reed; a weft yarn path; 160. 160A-160F. A sub-regulator; a sub-tank; a 164x. 165. 165A-165 f. 166. 166A-166 f.. tubing sets; an end sensor; 1431.. air spring pressure adjusting part; 1431a.. primary side space; 1431b.. secondary side space; a septum; 1432.. pilot operated on-off valves; 1432out. 1433.. an exhaust valve; 1433out.. exhaust port; 1434. an electromagnetic valve for gas supply; 1435. an electromagnetic valve for exhaust; 1435out.. exhaust port; TL.. weave width; p10.. tubing; piping (supply site); pipes (2 nd connection part) P143S, P143Sa, P143sb; piping (1 st connection part); piping, P145, P146; piping; piping; a primary system; a subsystem; weft yarns.

Detailed Description

Hereinafter, an embodiment of a weft insertion device for an air jet loom will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals.

First, the structure of weft insertion device 100 of the air jet loom according to the embodiment will be described with reference to fig. 1. Fig. 1 is a configuration diagram showing a weft insertion device 100 of an air jet loom according to an embodiment.

In this specification, a weft yarn is inserted into a warp opening, and the opposite side to the weft insertion direction is referred to as an upstream side and the weft insertion direction side is referred to as a downstream side with respect to the weft insertion direction in which the weft yarn is conveyed. In the direction of the flow of the compressed air, the source flow side is set as upstream and the opposite side to the source flow is set as downstream.

[ Structure of weft insertion device 100 ]

The weft insertion device 100 shown in fig. 1 mainly includes a control unit 110, a main system M, a sub-system S, a reed 150, and an end sensor 170. Although the weft insertion device 100 shown in fig. 1 has one main system M as a specific example, it may have two or more main systems M.

The control unit 110 is provided with a CPU111 and a function panel 112. The CPU111 executes various controls for the weft insertion operation of the weft insertion device 100 based on the installed control program. The function panel 112 is a report unit that reports various information, has a display function and an input function, displays various information based on the content instructed from the CPU111, and transmits the input information to the CPU 111.

The main system M includes a yarn feeding unit 120, a weft length measuring and accumulating unit 130, and a weft insertion nozzle 140. The yarn supplying portion 120 is provided upstream of the weft length measuring and accumulating portion 130, and holds the weft yarn Y. The weft yarn Y of the yarn supplying portion 120 is drawn out by the weft length measuring and accumulating portion 130.

The weft measuring and accumulating unit 130 is provided with an accumulating drum 131, a weft unwinding pin 132, and a balloon sensor 133. The accumulating drum 131 draws out the weft yarn Y of the yarn supplying portion 120 and accumulates the weft yarn Y in a wound state. The weft unwinding pin 132 and the air coil sensor 133 are disposed around the accumulating drum 131. The balloon sensor 133 is arranged in parallel with the weft unwinding pin 132 on the unwinding direction side of the weft Y.

The weft unwinding pin 132 unwinds the weft Y accumulated in the accumulation drum 131 at a loom rotation angle preset in the control unit 110. The balloon sensor 133 detects the weft yarn Y unwound from the accumulating drum 131 during weft insertion, and transmits a weft unwinding signal to the control section 110. The control unit 110, upon receiving a weft unwinding signal of a preset number of turns, causes the weft unwinding pin 132 to be in a locked state. Thus, the weft unwinding pin 132 locks the weft Y unwound from the storage drum 131, and the weft insertion of the weft Y is completed. The operating time point for the weft yarn unwinding pin 132 to lock the weft yarn Y is set according to the number of winding turns required to store the weft yarn Y having a length corresponding to the knitting width TL in the storage drum 131.

When the length of the weft yarn Y wound around the accumulating drum 131 by N turns corresponds to the knitting width TL, the control unit 110 receives the weft unwinding signal from the balloon sensor 133N times, and transmits an operation signal for locking the weft yarn Y to the weft unwinding pin 132. The weft unwinding signal of the balloon sensor 133 is an unwinding signal of the weft Y from the accumulating drum 131, and the control unit 110 recognizes the weft unwinding signal of the balloon sensor 133 as a weft unwinding time point based on a loom rotation angle signal obtained from an encoder.

As the weft insertion nozzle 140, a tandem nozzle 141 and a main nozzle 142 are provided. The tandem nozzle 141 draws out the weft yarn Y from the accumulating drum 131 by the jet of the compressed air. A brake 147 for braking the weft Y that has passed before the end of weft insertion is provided upstream of the tandem nozzle 141.

The main nozzle 142 picks up the weft yarn Y to the weft yarn passage 153 of the reed 150 by the jet of compressed air. The main nozzle 142 is connected to a main valve 146 via a pipe P146. The main valve 146 is connected to the 1 st main tank 144M as the 1 st tank via a pipe P144 as the 1 st connection portion.

The tandem nozzle 141 is connected to a tandem valve 145 through a pipe P145. The series valve 145 is connected to a1 st main tank 144M shared with a main valve 146 via a pipe P144. The tandem valve 145 and the main valve 146 may be directly connected to the 1 st main tank 144M without passing through the pipe P144. In this case, the "1 st connection portion" of the present invention is a connection portion between the series valve 145, the main valve 146, and the 1 st main tank 144M.

The compressed air supplied from the air compressor 10 installed in the textile factory is pressure-regulated by the main regulator 143, supplied to and stored in the 1 st main tank 144M through the pipe P143M. The pipe P143M functions as a supply point for supplying compressed air from the main regulator 143 to the 1 st main tank 144M. The main regulator 143 is constituted by an electro-pneumatic regulator. The pressure sensor 144x detects the pressure of the compressed air stored in the 1 st main tank 144M, and transmits the detection result to the control unit 110. It should be noted that the pressure sensor 144x may be built into the main regulator 143. In this case, the pressure of the 1 st main tank 144M can be estimated from the pressure on the downstream side of the main regulator 143.

The 1 st main tank 144M as the 1 st tank is connected to the 2 nd main tank 144S as the 2 nd tank via a pipe P143S. The pipe P143S is provided with flow path resistance and functions as the 2 nd connection part for passing compressed air between the 1 st main tank 144M and the 2 nd main tank 144S. That is, the 2 nd main tank 144S is connected to the 1 st main tank 144M via a pipe P143S, which is a2 nd connection part different from the pipe P144 as the 1 st connection part. Here, the pipe P143S as the 2 nd connection part is connected to a pipe P143M as a supply part for supplying compressed air from the main regulator 143 as an electro-pneumatic regulator to the 1 st main tank 144M. The pipe P143S as the 2 nd connection part may be directly connected to the 1 st main tank 144M.

The reed 150 is arranged on the downstream side of the weft insertion nozzle 140 of the main system M and is constituted by a plurality of dents. The warp yarn is configured to pass between each of the plurality of dents. The weft passage 153, in which the weft can be fed, is formed by a recess provided near the center of the plurality of dents in the vertical direction. In the reed 150, a plurality of nozzles constituting the sub-nozzles 160 (hereinafter, a plurality of sub-nozzle groups 160) and an end sensor 170 are arranged along the weft passage 153.

In the sub-system S, the plurality of sub-nozzle groups 160 are arranged along the weft passage 153 of the reed 150 so that the weft yarn Y is passed through the weft passage 153 by the injection of compressed air (hereinafter, referred to as "air injection"). For example, the plurality of sub-nozzle groups 160 are divided into 6 groups, and each of the sub-nozzle groups 160A to 160F is composed of 4 sub-nozzles.

Each of the sub-nozzle groups 160A to 160F is connected to a plurality of sub-valves 165 via a plurality of piping groups 166. The plurality of piping groups 166 are divided into 6 groups corresponding to the plurality of sub-nozzle groups 160, and each of the piping groups 166A to 166F is composed of 4 pipes. The sub-valves 165 are constituted by sub-valves 165A to 165F in accordance with the respective piping groups 166A to 166F, and are connected to the common sub-tank 164.

The sub tank 164 is connected to the sub regulator 162 via a pipe P163. The sub-regulator 162 is connected to the air compressor 10 in parallel with the main regulator 143 via a pipe P161. Therefore, the sub-tank 164 stores compressed air whose pressure is adjusted by the sub-regulator 162. The pressure sensor 164x detects the pressure of the compressed air stored in the subtank 164, and transmits the detection result to the control unit 110. It should be noted that the pressure sensor 164x may also be internally disposed within the sub-regulator 162. In this case, the pressure of the sub-tank 164 can be estimated from the pressure on the downstream side of the sub-regulator 162.

The end sensor 170 is disposed at the weaving end on the downstream side of the weft passage 153 and on the downstream side of the weaving width TL, and optically detects the weft yarn Y that has reached the detection range. The end sensor 170 may include a light emitting portion, a light receiving portion, and a light guiding portion in order to detect the weft yarn Y that has reached the detection range. The end sensor 170 transmits a weft detection signal generated by detecting the weft Y to the control unit 110. The weft detection signal from the end sensor 170 is a weft end arrival signal of the weft Y, and is recognized as an end arrival time point by the control section 110.

[ Structure and operation of Main regulator 143 ]

Next, the structure and operation of the main regulator 143 will be described in detail with reference to fig. 2. Fig. 2 is a configuration diagram showing the configuration of the main adjuster 143 of the weft insertion device 100 according to the embodiment.

The main regulator 143 is an electro-pneumatic regulator, and is mainly configured to include an air spring pressure adjustment portion 1431, a pilot type opening/closing valve 1432, an exhaust valve 1433, an air supply solenoid valve 1434, and an exhaust solenoid valve 1435.

A diaphragm 1431d is disposed in the air spring pressure adjustment portion 1431 so as to divide the case into two parts. As a result, the air spring pressure adjustment part 1431 has a primary side space 1431a on one side of the diaphragm 1431d and a secondary side space 1431b on the other side. The diaphragm 1431d is displaced to one side by a difference between the pressure in the primary side space 1431a and the pressure in the secondary side space 1431b. The primary side space 1431a is connected to an air supply solenoid valve 1434 and an air discharge solenoid valve 1435 via a pipe P143 a.

The pilot-operated on-off valve 1432 includes an inlet 1432in connected to the pipe P10 on the air compressor 10 side and an outlet 1432out connected to the pipe P143M on the 1 st main tank 144M side. The pilot type opening/closing valve 1432 is connected to a diaphragm 1431d of the air spring pressure adjustment unit 1431, and performs an opening/closing operation in accordance with displacement of the diaphragm 1431d.

For example, the pilot-operated on-off valve 1432 is opened when the primary side space 1431a is at a higher pressure than the secondary side space 1431b, and the pilot-operated on-off valve 1432 is closed when the primary side space 1431a is at a pressure equal to the secondary side space 1431b or at a lower pressure than the secondary side space 1431b. When the pilot type opening/closing valve 1432 is opened, the inlet 1432in and the outlet 1432out are communicated, and the high-pressure compressed air on the air compressor 10 side is supplied to the 1 st main tank 144M side. The pipe P143M connected to the outlet 1432out of the pilot type opening/closing valve 1432 communicates with the secondary side space 1431b through the pipe P143 b.

The exhaust valve 1433 includes a pipe line P143c communicating with the secondary side space 1431b and an exhaust port 1433out communicating with the atmosphere side, and is opened and closed by displacement of a diaphragm 1431d, similarly to the pilot type opening and closing valve 1432.

For example, when the primary side space 1431a is in equilibrium with the secondary side space 1431b or is in a higher pressure state than the secondary side space 1431b, the exhaust valve 1433 is closed. When the secondary-side space 1431b becomes higher in pressure than the primary-side space 1431a, the exhaust valve 1433 is opened by displacement of the diaphragm 1431d. Therefore, the compressed air in the secondary side space 1431b, that is, the compressed air on the outlet 1432out side of the pilot type on-off valve 1432 is discharged from the exhaust port 1433out through the pipe line P143b, the secondary side space 1431b, and the pipe line P143 c.

The air supply solenoid valve 1434 and the air discharge solenoid valve 1435 are opened and closed by a command from the control unit 110. The supply solenoid valve 1434 is connected to a pipe P10 connected to the air compressor 10 via a pipe P143 b. Therefore, when the supply solenoid valve 1434 is opened, the compressed air at the original pressure is supplied to the primary side space 1431a of the air spring pressure adjustment portion 1431 through the pipe line P143 a. The exhaust solenoid valve 1435 includes an exhaust port 1435out opened to the outside. When the exhaust solenoid valve 1435 is opened, the compressed air in the primary side space 1431a of the air spring pressure adjustment portion 1431 is discharged to the outside from the exhaust port 1435out.

Therefore, when the pressure of the compressed air detected by the pressure sensor 144x is within a predetermined range, the main regulator 143 adjusts the pressure of the compressed air in the 1 st main tank 144M by the operation of the air spring pressure adjustment unit 1431, the pilot type opening/closing valve 1432, and the exhaust valve 1433. When the pressure of the compressed air detected by the pressure sensor 144x exceeds a predetermined range, the main regulator 143 largely displaces the diaphragm 1431d by the operation of either the air supply solenoid valve 1434 or the air discharge solenoid valve 1435, which receives a command from the control unit 110. Due to the large displacement of the diaphragm 1431d, the pilot type opening/closing valve 1432 and the exhaust valve 1433 rapidly operate, and the pressure of the compressed air in the 1 st main tank 144M is rapidly adjusted.

[ 1 st main tank 144M and 2 nd main tank 144S ]

Next, the 1 st main tank 144M as the 1 st tank and the 2 nd main tank 144S as the 2 nd tank will be described with reference to fig. 3. Fig. 3 is a configuration diagram showing the configuration of the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment.

As shown in fig. 3, the 2 nd main tank 144S is connected to a part of the pipe P143M, which is a supply point where the compressed air is supplied from the main regulator 143 to the 1 st main tank 144M, via a pipe P143S. The pipe P143S is a2 nd connection part to which flow resistance is applied for connecting the 2 nd main tank 144S to the 1 st main tank 144M.

The compressed air whose pressure has been adjusted by the main regulator 143 passes through the pipe P143M and is stored in the 1 st main tank 144M, and also passes through the pipe P143M and the pipe P143S and is stored in the 2 nd main tank 144S.

When the volume of the 1 st main tank 144M is V1 and the volume of the 2 nd main tank 144S is V2, the relationship of V1 < V2 is preferably satisfied. In the weft insertion device 100, when the volume of the conventional main tank is Vorg, it is preferable that Vorg be equal to V1+ V2.

The flow path resistance of the pipe P143S is determined by the pipe diameter, the change in pipe diameter, the pipe length, the friction in the pipe, the presence or absence of bending of the joint, and the like. Namely, there is a tendency as follows: the flow path resistance is increased by the length of the tube, the diameter of the tube being reduced, the friction in the tube being increased, the presence of a bend, and the like.

Here, when the flow resistance of the pipe P143M, which is a supply portion for supplying compressed air from the main regulator 143 to the 1 st main tank 144M, is R1, and the flow resistance of the pipe P143S, which is a2 nd connection portion to the 2 nd main tank 144S, is R2, it is preferable that the relationship of R1 < R2 be satisfied. That is, the "flow path resistance" given to the pipe P143S means that the pipe has a flow path resistance greater than that of the pipe P143M.

[ flow of compressed air at the 1 st and 2 nd

main tanks

144M and 144S ]

Next, referring to fig. 4, the flow of the compressed air in the 1 st main tank 144M and the 2 nd main tank 144S will be described in 3 steps of (a) to (c). Fig. 4 is an explanatory diagram showing flows of compressed air in the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment.

As a premise, the compressed air from the main regulator 143 is supplied to the 1 st main tank 144M through the pipe P143M, and is also supplied to the 2 nd main tank 144S through the pipe P143M and the pipe P143S. Thereby, the compressed air stored in the 1 st main tank 144M is kept at a predetermined pressure.

(a) At the time of air injection by the main nozzle 142:

as shown in fig. 4 (a), compressed air stored in the 1 st main tank 144M for weft insertion is injected from the main nozzle 142 via the main valve 146 (a 1).

At this time, the compressed air from the main regulator 143 passes through the pipe P143M and is replenished to the 1 st main tank 144M (a 2). The compressed air stored in the 2 nd main tank 144S passes through the pipe P143S and the pipe P143M, and is replenished to the 1 st main tank 144M (a 3). As a result thereof, compressed air from the tank of the total volume of the 1 st main tank 144M and the 2 nd main tank 144S is injected from the main nozzle 142.

(b) After air injection by the main nozzle 142 (1):

when the air injection from the main nozzle 142 is completed, as shown in fig. 4 (b), the compressed air from the main regulator 143 is supplied only to the pipe P143M side having a smaller flow path resistance than the pipe P143S, and when the flow path resistance of the pipe P143M, which is the supply (b1) to the 1 st main tank 144M, is R1 and the flow path resistance of the pipe P143S is R2, R1 < R2 is satisfied.

At this time, the compressed air from the main regulator 143 is less likely to flow to the pipe P143S side having a flow resistance greater than that of the pipe P143M, and therefore the compressed air is not supplied to the 2 nd main tank 144S. As a result thereof, the pressure of the 1 st main tank 144M is rapidly restored after the air is injected from the main nozzle 142. Even when R1 is R2 or R1 > R2, the pressure drop at the start and at the operation can be suppressed as compared with the conventional technique in which the 2 nd main tank 144S is not provided.

Further, when the volume of the 1 st main tank 144M is V1 and the volume of the 2 nd main tank 144S is V2, V1 < V2 is satisfied, and the amount of pressure drop in the 1 st main tank 144M at startup can be suppressed to be smaller. Even when V1 is equal to V2 or V1 > V2, the pressure drop at the start and at the operation can be suppressed as compared with the conventional technique in which the 2 nd main tank 144S is not provided.

(c) After air injection by the main nozzle 142 (2):

as the pressure of the 1 st main tank 144M is restored based on the above (b), as shown in fig. 4 (c), the compressed air from the main regulator 143 passes through the pipe P143M to be supplied to the 1 st main tank 144M (c1), and also passes through the pipe P143M and the pipe P143S to be supplied to the 2 nd main tank 144S (c 2).

As described above, since the main tank is divided into the 1 st main tank 144M and the 2 nd main tank 144S, when air is injected from the main nozzle 142, the total volume of the compressed air of the 1 st main tank 144M and the 2 nd main tank 144S can be used, and the pressure of the 1 st main tank 144M can be quickly restored before the air is injected from the main nozzle 142. As a result, the pressure drop of the compressed air at the time of startup can be suppressed, and the pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than that of the conventional one.

[ pressure characteristics of compressed air ]

Next, the pressure characteristics of the compressed air will be described with reference to fig. 5 to 8. Fig. 5 to 7 are characteristic diagrams showing pressure characteristics of compressed air of comparative examples. Fig. 8 is a characteristic diagram showing pressure characteristics of compressed air according to the embodiment. In each figure, the vertical axis represents the pressure of the 1 st main tank 144M, and the horizontal axis represents the time from before operation to start-up to operation.

Fig. 5 shows the characteristic of the pressure change when the flow rate of the compressed air of the main nozzle 142 is set to the standard state in the weft insertion device of the comparative example having no 2 nd main tank but only the 1 st main tank. In this case, the pressure fluctuation during operation after the start-up is smaller than in any case described later. In this case, the main regulator 143 does not use the supply solenoid valve 1434 and the exhaust solenoid valve 1435.

Fig. 6 shows the pressure change characteristics when the flow rate of the compressed air of the main nozzle 142 is set to be the maximum in the weft insertion device of the comparative example having only the 1 st main tank without the 2 nd main tank. In the characteristic of fig. 6, at the time of startup, since air injection from main valve 146 is repeated as an initial operation, the pressure drop amount is α, and a significant pressure drop occurs. At this time, the main regulator 143 supplies compressed air to the tank based on a plurality of air supply signals from the control section 110 and based on the air supply solenoid valve 1434. Therefore, the load of the main regulator 143 also becomes large. In fig. 6, the pressure fluctuation amount during operation is reduced to γ smaller than α.

Fig. 7 shows the pressure change characteristics when the volume of the 1 st main tank is set to 1/2 in fig. 6 and the flow rate of the compressed air of the main nozzle 142 is set to the maximum in the weft insertion device of the comparative example having no 2 nd main tank but having only the 1 st main tank. In the characteristic of fig. 7, the volume of the 1 st main tank is set to 1/2 of fig. 6, whereby the compressed air at the time of startup can be supplemented into the 1 st main tank at an early stage, and the pressure drop amount α shown in fig. 6 is improved to a pressure drop amount β smaller than α.

On the other hand, during operation, the pressure fluctuation amount γ is shown in fig. 6, and the volume of the tank is 1/2, whereby the pressure fluctuation amount δ is larger than γ in fig. 7. That is, the pressure drop at the time of startup is suppressed by reducing the volume of the tank, but the pressure fluctuation at the time of operation is worsened.

Fig. 8 is a characteristic diagram showing the pressure characteristics of the compressed air in the 1 st main tank 144M according to the embodiment. Here, in the weft insertion device according to the embodiment including the 1 st main tank 144M and the 2 nd main tank 144S, the total volume V1+ V2 obtained by adding the volume V1 of the 1 st main tank 144M and the volume V2 of the 2 nd main tank 144S is set to be equal to the volume Vorg of the conventional 1 st main tank of the weft insertion device used in fig. 6 and 7.

The amount of pressure decrease at the time of startup in fig. 8 is improved to a pressure decrease amount β smaller than α, as in the case of fig. 7, by making the volume of the 1 st main tank 144M about 1/2 the volume Vorg of the conventional 1 st main tank, whereby the compressed air can be replenished into the tank at an early stage. Therefore, the main regulator 143 hardly uses the air supply solenoid valve 1434 and the air discharge solenoid valve 1435, and the load becomes small.

The pressure fluctuation amount during operation in fig. 8 is contracted to a pressure fluctuation amount γ in the same manner as in fig. 6 by setting the total volume V1+ V2 obtained by adding the volume V1 of the 1 st main tank 144M and the volume V2 of the 2 nd main tank 144S to the same volume Vorg of the conventional 1 st main tank. Therefore, the main regulator 143 hardly uses the air supply solenoid valve 1434 and the air discharge solenoid valve 1435, and the load becomes small.

In the pressure characteristic of fig. 8, the pressure drops rapidly as shown in (a) by the injection of compressed air from the main nozzle 142, then rises rapidly as shown in (b) by the supply of compressed air only to the 1 st main tank 144M, and then drops slowly as shown in (c) by the supply of compressed air to the 2 nd main tank 144S in addition to the 1 st main tank 144M.

[ modification of connection between the 1 st main tank 144M and the 2 nd main tank 144S ]

Next, a modification of the connection between the 1 st main tank 144M and the 2 nd main tank 144S will be described with reference to fig. 9 to 11.

Fig. 9 is a configuration diagram showing a1 st modification example of the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment. In fig. 9, the 2 nd main tank 144S is separated from the pipe P144 as the 1 st connection part, and is directly connected to the 1 st main tank 144M via the pipe P143Sb without via the pipe P143M, which is a supply part of the compressed air from the main regulator 143 to the 1 st main tank 144M. In this modification, the pipe P143Sb functions as the 2 nd connection part. The 2 nd main tank 144S can receive the supply of the compressed air through the 1 st main tank 144M and can supply the compressed air to the 1 st main tank 144M. In this case, the pipe P143Sb can be freely provided separately from the pipe P143M, and the arrangement of the 2 nd main tank 144S and the handling of the pipes are facilitated.

Fig. 10 is a configuration diagram showing a2 nd modification example of the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment. In fig. 10, the 2 nd main tank 144S is connected to a part of the pipe P143M, which is a supply point of the compressed air from the main regulator 143 to the 1 st main tank 144M, via the pipe P143Sa, and is directly connected to the 1 st main tank 144M via the pipe P143Sb separately provided to the 1 st main tank 144M from the pipe P143M. In this case, since the compressed air is supplied to the 2 nd main tank 144S through the pipe serving as the 2 nd connection portion of the two systems of the pipe P143Sa and the pipe P143Sb, the adjustment range of the flow resistance R2a of the pipe P143Sa and the flow resistance R2b of the pipe P143Sb is increased.

Fig. 11 is a configuration diagram showing a3 rd modification of the 1 st main tank 144M and the 2 nd main tank 144S of the weft insertion device 100 according to the embodiment. In fig. 11, the 1 st main tank 144M and the 2 nd main tank 144S are partitioned by a partition wall W and integrally configured. The 1 st main tank 144M and the 2 nd main tank 144S are directly connected to each other through a communication port H143MS provided in the partition wall W. Here, the communication port H143MS functions as the 2 nd connecting portion connected between the 1 st main tank 144M and the 2 nd main tank 144S. The diameter of the communication port H143MS was adjusted so that a flow resistance R2 larger than the flow resistance R1 of the pipe P143M could be obtained. The communication port H143MS may be a communication pipe using a pipe. In this case, the tank having the same volume as that of the conventional weft insertion device can be divided into the 1 st main tank 144M and the 2 nd main tank 144S by partitioning the tanks by the partition wall W, and the configuration and arrangement of the conventional weft insertion device can be utilized.

[ Effect obtained according to the embodiment ]

As described above, according to the embodiments of the present invention, the following effects can be obtained.

The weft insertion device 100 of the air jet loom of the present invention includes: a1 st main tank 144M as a1 st tank storing compressed air; a main regulator 143 that adjusts the pressure of the compressed air supplied from the air compressor 10 and supplies the adjusted compressed air to the 1 st main tank 144M; a main nozzle 142 for injecting compressed air stored in the 1 st main tank 144M; a main valve 146 connected to the 1 st main tank 144M via a pipe P144 serving as the 1 st connection part and configured to supply the compressed air stored in the 1 st main tank 144M to the main nozzle 142; and a2 nd main tank 144S connected to the 1 st main tank 144M via a pipe P143S that is a2 nd connection unit different from the 1 st connection unit.

Since the 1 st main tank 144M and the 2 nd main tank 144S are thus divided, when air is injected from the main nozzle 142, the total volume of the compressed air of the 1 st main tank 144M and the 2 nd main tank 144S can be used, and the pressure of the 1 st main tank 144M can be quickly restored before the air is injected from the main nozzle 142. As a result, the amount of pressure drop of the compressed air at the time of startup can be suppressed, and the amount of pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than in the conventional case.

The pipe P143S as the 2 nd connection part is connected to a pipe P143M as a supply part for supplying compressed air from the main regulator 143 to the 1 st main tank 144M. That is, the 2 nd main tank 144S is connected to a portion in the middle of the pipe P143M, which is a supply point where the compressed air is supplied from the main regulator 143 to the 1 st main tank 144M, via the pipe P143S, which is a2 nd connection portion. In this case, the 2 nd main tank 144S can perform both supply of compressed air received from the main regulator 143 and supply of compressed air to the 1 st main tank 144M. As a result, the amount of pressure drop of the compressed air at the time of startup can be suppressed, and the amount of pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than in the conventional case.

The pipe P143Sb as the 2 nd connection part is directly connected to the 1 st main tank 144M. That is, the 2 nd main tank 144S is directly connected to the 1 st main tank 144M via the pipe P143Sb as the 2 nd connecting part without passing through the pipe P143M for supplying compressed air from the main regulator 143 to the 1 st main tank 144M. In this case, the 2 nd main tank 144S can perform both supply of compressed air received via the 1 st main tank 144M and supply of compressed air to the 1 st main tank 144M. As a result, the amount of pressure drop of the compressed air at the time of startup can be suppressed, and the amount of pressure fluctuation of the compressed air at the time of operation can be suppressed to be smaller than in the conventional case.

When the volume of the 1 st main tank 144M is set to V1 and the volume of the 2 nd main tank 144S is set to V2, V1 < V2 are satisfied, and the amount of pressure drop in the 1 st main tank 144M at startup can be suppressed to be smaller.

When the flow resistance of the pipe P143M, which is the supply point of the compressed air from the main regulator 143 to the 1 st main tank 144M, is R1 and the flow resistance of the pipe P143S to the 2 nd main tank 144S is R2, R1 < R2 is satisfied, so that the pressure of the 1 st main tank 144M can be quickly restored before the air is injected from the main nozzle 142, and the pressure drop of the compressed air can be suppressed.

In the above embodiment, the main tank is configured by the 1 st main tank 144M and the 2 nd main tank 144S, but the sub tank 164 may be configured by the 1 st sub tank and the 2 nd sub tank in the same manner.

Claims

1. A weft insertion device for an air jet loom, comprising:

a1 st tank storing compressed air;

an electro-pneumatic regulator that adjusts the pressure of the compressed air supplied from the air compressor and supplies the compressed air to the 1 st tank;

a nozzle that ejects the compressed air; and

a valve connected to the 1 st tank via a1 st connection part and configured to supply the compressed air stored in the 1 st tank to the nozzle,

a weft insertion device of an air jet loom has a2 nd tank, and the 2 nd tank is connected to the 1 st tank via a2 nd connection section different from the 1 st connection section.

2. Weft insertion device for an air jet loom according to claim 1,

the 2 nd connecting portion is connected to a supply portion for supplying the compressed air from the electro-pneumatic regulator to the 1 st tank.

3. Weft insertion device for an air jet loom according to claim 1,

the 2 nd connection part is directly connected to the 1 st tank.

4. Weft insertion device for an air jet loom according to any one of claims 1 to 3,

when the volume of the 1 st tank is V1 and the volume of the 2 nd tank is V2, V1 < V2 is satisfied.

5. Weft insertion device for an air jet loom according to any one of claims 1 to 4,

when the flow path resistance of the supply portion for supplying the compressed air from the electro-pneumatic regulator to the 1 st tank is R1 and the flow path resistance of the 2 nd connecting portion is R2, R1 < R2 is satisfied.