JPS6353304B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jet loom weft insertion device that performs weft insertion using fluid.

In a conventional jet room, the weft stored in a weft storage device having a suction type storage tube and a weft gripper, or a weft storage device having a weft winding drum and a weft locking member, etc., is opened by high-speed fluid sprayed from a main nozzle. Weft insertion is carried out inside the
After beating, the weft yarn is cut by a cutting device near the main nozzle. If the cut end of the weft yarn is left exposed to the high-speed fluid in the main nozzle, untwisting may occur, and as a result, yarn breakage may occur if the weft yarn is a spun yarn. For this reason, it is common practice to stop jetting the fluid after the weft is cut. However, if the fluid injection is completely stopped, the weft end will hang down from the main nozzle, and even when high-speed fluid is ejected for the next weft insertion, the weft end will not straighten, and as a result, the weft thread will be pulled against the weft insertion guide. This may cause weft insertion errors. In order to prevent this and to prevent the weft thread from being pulled out from the main nozzle, after weft insertion is complete, the cut weft end is kept straight in preparation for the next weft insertion. Japanese Patent Application Laid-Open No. 1983-1980 (1983) proposed that a weak flow be injected from the main nozzle.
This is proposed in Publication No. 59454.

However, during operation of the loom, if the weft yarn breaks on the weft storage device side due to various reasons and the loom stops, or the type of fabric is changed, the loom cannot be operated until it is re-loomed. In such cases, it may be necessary to pass the weft thread through the main nozzle. Generally, when the machine is stopped, the supply of fluid to the main nozzle is stopped in order to save power consumption and to remove the cause of the machine stoppage. Therefore, the machine is moved to the weft insertion position by inching operation etc. until the warp threads are open.
High-speed fluid for weft insertion was injected from the main nozzle, and the weft thread was threaded through the main nozzle using the ejector effect. However, at this time, the machine is in the weft insertion position, and the main nozzle's fluid switching valve is open and fluid is being sprayed, so after threading, the machine immediately rotates and stops. If the position is not moved to a position other than the weft insertion position, there is a serious problem in that the jetted fluid will cause the weft thread to break within the main nozzle. Therefore, the work of threading the weft through the main nozzle was very complicated and time consuming. Furthermore, even if the weak flow described above continues to be ejected from the main nozzle at the machine stop position, such a weak flow has been weakened to the extent that no untwisting of the weft occurs. This is insufficient to create an ejector effect for threading the weft through the main nozzle.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of conventional devices and to make it possible to easily thread the weft through the main nozzle.

The present invention provides fluid supply between the main nozzle and the first fluid passage via the first switching valve that operates synchronously in conjunction with the operation of the loom so that high-speed fluid is sent from the fluid supply source to the main nozzle only during weft insertion. In the weft inserting device disposed between the weft sources, the first
The downstream position of the switching valve and the fluid supply source are connected via a pressure control valve through a second fluid passage, so that when the first switching valve is closed, a weak flow is injected from the main nozzle via the second fluid passage, and 2nd fluid passage
A switching valve is installed, and a fluid passage for threading is formed by connecting the second switching valve and a fluid supply source through a third fluid passage, and the second fluid passage or the third fluid passage is formed by operating the second switching valve. The desired purpose is achieved by selecting communication with the main nozzle and making it possible to appropriately select either a weak flow or a fluid stronger than the weak threading flow.

The present invention will be described in detail below based on embodiments shown in the accompanying drawings.

FIG. 1 is a piping diagram in one embodiment of the weft insertion device of the present invention. As shown in Fig. 1, the weft 1 stored in the weft storage device (not shown) is moved into the weft opening by high-speed fluid jetted from the main nozzle 3 disposed on the slay 2 during weft insertion. The weft is inserted while being guided by the insertion guide 4, and then beaten with a reed 5.

According to the invention, the main nozzle 3 is connected to the air tank 6 via several pipes.

According to the embodiment shown in FIG. 1, the air tank 6 is connected to a fluid supply source (not shown) via a pipe 7, and compressed air is supplied into the air tank from the direction of arrow A. In order to generate a high-speed flow for weft insertion, the main nozzle 3 and the air tank 6 are connected via a solenoid valve 8, a pipe 9, a switching valve (rotary valve in the illustrated case) 11, and a pipe 12. A solenoid valve is a type of switching valve that is open during normal operation, but is operated to be closed when the loom is stopped or when the loom is running in reverse. This is to prevent high-speed flow from being ejected from the main nozzle even if the machine stops in the open state or opens during reverse rotation. A gear 1 is attached to one end of the rotary valve 11.
3 is attached, and this gear 13 is configured to rotate in conjunction with the operation of the loom, for example, in synchronization with the main shaft (not shown) of the loom. The rotary valve 11 opens only during weft insertion and is closed at other times. Therefore, during normal operation, the main nozzle 3 and the air tank 6 communicate with each other during weft insertion, and fluid is injected from the main nozzle at high speed.

Further, the main nozzle 3 and the air tank 6 are connected via a control valve 14, a pipe 15, a switching valve 16, a pipe 17, and a pipe 12. The control valve 1
4 adjusts the flow rate so that a weak flow is ejected from the main nozzle 3. Note that this control valve 14 may be configured as a pressure regulating valve to adjust the pressure. The switching valve 16 is a three-port valve, with one port 16a connected to the pipe 15, another port 16b connected to a pipe 17, and the remaining port 16c connected to the air tank 6 via a control valve 19. The connected pipes 18 are connected. By configuring the control valve 19 so as to be able to adjust the flow rate or the pressure, it is possible to prevent yarn breakage when using weak or thin yarn. The switching valve 16 is operated manually. Note that the switching valve 16 may be configured with a solenoid valve or the like so that the switching can be performed electromagnetically. The switching valve 16 in FIG. 1 is a push button valve, and the flow is switched by pushing the push button 16d. When the push button 16d is not pressed, the ports 16a and 16b are in communication. Therefore, unless the push button 16d is pressed, the air sent out from the air tank 6 via the control valve 14 is supplied to the main nozzle, and a weak flow is always injected from the main nozzle. On the other hand, when the push button 16d is pressed, the ports 16c and 16b are in communication, and the main nozzle 3 and the air tank 6 are therefore in communication, and as a result, high-speed fluid is injected from the main nozzle 3.

Therefore, if you want to pass a weft yarn through the main nozzle 3, press the push button 16d while the machine is stopped, and high-speed fluid will be ejected from the main nozzle 3. Therefore, inserting a longer weft yarn into the main nozzle 3 will produce an ejector effect. It can be passed into the main nozzle 3 by this. Thereafter, a predetermined amount of weft is stored in the weft storage device, and the weft protruding from the tip of the main nozzle is cut in preparation for restarting the loom. Note that the procedure for passing the weft yarn through the main nozzle 3 may be such that after a predetermined amount of weft yarn is stored in the weft storage device, the excess weft yarn that has been pulled out may be passed through the main nozzle 3.

FIG. 2 shows an embodiment showing the installation location of the switching valve 16. In the case of a push button type switching valve, it is preferable to install it in a location where it is easy to operate, for example, the second
As shown in the figure, it is preferable to install it outside the woven fabric 10 near the front of the fabric or near the main nozzle.
When the switching valve 16 is a solenoid valve, the switching valve itself may be installed at any location, but it is preferable to install a switch for operating the solenoid at a location where it can be easily operated.

According to the present invention, since the second fluid passages 15, 17 and the third fluid passage 18 can be selectively communicated with the main nozzle by the second switching valve 16, when the high-speed flow for weft insertion is closed, the weak flow The cut end of the weft can be prevented from being pulled out from the main nozzle, and threading into the main nozzle can also be carried out at will when the loom is stopped. After that, it was maintained with a weak flow and there was no longer any risk of it being pulled out. In addition, since the pipe connected to the main nozzle is ultimately only the pipe of the first fluid passage, it is possible to minimize the adverse effects on the pipe due to the violent back and forth movement of the main nozzle and the sley, and the pipe 17 connected to the first fluid passage can be minimized. Since there is only one line, maintenance is simple and easy, and a decrease in the operating rate can be avoided from a structural standpoint, even though there are three fluid passages. Furthermore, energy consumption could be maintained appropriately by adjusting the control valve of the second fluid passage in accordance with the thread used.

[Brief explanation of the drawing]

FIG. 1 is a piping diagram showing an embodiment of the weft insertion device of the present invention, and FIG. 2 is a plan view showing the mounting position of a push button valve. 1...Weft, 2...Sley, 3...Main nozzle, 4...Weft guide, 6...Air tank, 8...
...Solenoid valve, 11...Switching valve, 13...
Gear, 14...Control valve, 16...Switching valve, 16d
...Push button, 7, 9, 12, 15, 17, 18
……pipe.

Claims (1)

[Scope of Claims] 1. In a jet room weft insertion device that is capable of injecting fluid at high speed from a main nozzle during weft insertion and injecting a weak flow from the main nozzle at least at times other than the weft insertion period, the fluid is injected during weft insertion. There are first fluid passages 9 and 12 for supplying fluid to the main nozzle 3, and the first fluid passages are operated in conjunction with the operation of the loom so as to communicate the main nozzle with the fluid supply source 6 only during weft insertion. The first switching valve 11
There are second fluid passages 15 and 17 that connect the first fluid passage from the first switching valve to the main nozzle and the fluid supply source 6, and the second fluid passage has a weak flow from the main nozzle. A control valve 14 is provided for the injection, and a second switching valve 16 that can be operated independently of the first switching valve is provided downstream of the control valve, and further, the second switching valve and the fluid supply source are connected to each other. A third fluid passage 18 is provided to connect the
The third fluid passage is provided with a control valve 19 so as to supply threading fluid, and the third fluid passage is communicated with the main nozzle via the second switching valve 16 which can be operated at any time. Characteristic weft inserting device. 2. The weft insertion device according to claim 1, wherein the second switching valve is a three-port valve, and the second fluid passage is connected to one port of the three-port valve.