JPH02133636A - Weft-inserting method in jet room and air piping structure - Google Patents

Abstract

PURPOSE:To prevent falling-out of yarn and yarn breakage and carry out prevention of weft inserting miss in retained good posture of yarn by jetting high- pressure light air for controlling yarn posture from light air for preventing falling-out of yarn blowing out from a main nozzle for weft inserting directly before jet of weft insertion of the main nozzle. CONSTITUTION:Light air path for preventing falling-out of yarn and high- pressure light air path for controlling posture of yarn are parallel coupled between electromagnetic valve on air pipe path for weft insertion connected to a main nozzle for weft insertion and the main nozzle and simultaneously a change-over electromagnetic valve is inserted and mounted in the high-pressure light air path. An air piping structure is constituted so that the above-mentioned light air for controlling posture of yarn is jetted by operation of the above- mentioned change-over electromagnetic valve directly before when the above- mentioned main nozzle starts injection of weft insertion under conditions where light air for preventing falling-out of yarn is always blown out from the above- mentioned main nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Industry-1-] The present invention relates to a weft insertion method in a jet loom and an air piping structure therefor.

[Prior Art] In a jet loom that performs weft insertion by ejecting a weft yarn from a main nozzle for weft insertion, it is necessary to apply a low-pressure jet action to the weft yarn waiting to be inserted to adjust the attitude of the leading end.

The setting of the injection pressure level of this low-pressure injection action (hereinafter referred to as ?A wind) has a great influence on achieving a good yarn posture, and if the breeze is too strong, it will return all at once and cause the yarn to break. easy.

On the other hand, if the wind is too weak, the thread may hang down and the tip of the weft may come into contact with the warp or the weft insertion guide during weft insertion, or the weft may fall into the main weft insertion position due to the swing of the reed. The nozzle makes it easier to handle. Furthermore, in a multi-color jet loom where a plurality of weft yarns are inserted by a plurality of main nozzles for weft insertion, if the breeze is too strong, the vibrations of the weft tips become intense and the weft tips tend to get entangled with each other.

This breeze is constantly generated, but in addition to this, there are other measures to prevent weft insertion errors as follows. Jitsuko 59
In the conventional device disclosed in Publication No. 22130, the breeze air is sent to the main nozzle for weft insertion after weft insertion only before and after the time when the inserted weft is cut and separated from the two main nozzles for weft insertion. This prevents the weft from coming out of the weft insertion main nozzle due to weft cutting shock. In the conventional device disclosed in Japanese Utility Model Publication No. 61-4543, a shielding plate is installed in front of the main nozzle for weft insertion, which is switched between the weft insertion position and the retracted (i7) position, and the weft insertion is carried out on this shielding plate. A weft hole and a protrusion are provided so that the leading end of the weft yarn, which is exposed to a breeze and is waiting to be inserted, is deflected by the protrusion in a direction in which it does not get entangled with other weft yarns. In Japanese Patent No. 216950, the leading end of the weft that is waiting for weft insertion is appropriately pulled back by a pulling R mechanism consisting of a cam mechanism so that it is hidden inside the main nozzle for weft insertion, and the weft that is being inserted continuously is The weft yarns are also pulled back appropriately, thereby preventing adjacent weft yarns from becoming entangled with each other.

[Problems to be Solved by the Invention] However, the conventional device disclosed in Publication of Utility Model Publication No. 5!122130 is only able to prevent yarn coming out due to weft cutting shock, but cannot prevent yarn coming out due to swinging of the reed. The effect is insufficient. The conventional device disclosed in Japanese Utility Model Publication No. 61-4543, which targets multicolor jet looms, is only effective for switching movable configurations of the main nozzle for weft insertion.
However, with the movable configuration of the main nozzle for weft insertion, there is a high possibility that the tip of the weft yarn that has started weft insertion will hit the shielding plate. Therefore, the configuration of this conventional device hinders the speeding up of the loom, and furthermore, the changing orientation of the weft tip during standby tends to cause weft insertion errors.

Also, JP-A-59-21, which features a multicolored jet loom.
The conventional device disclosed in Publication No. 6950 is extremely effective in removing threads and preventing thread entanglement, but what about the pull-back mechanism? However, there is also the problem of space required for installation near the weft insertion device.

It is an object of the present invention to provide a method and apparatus for achieving stable weft insertion while solving the problems inherent in each of these conventional devices.

[Problems to be Solved by the Invention] For this purpose, in the present invention, the breeze for adjusting the yarn posture is blown out from the main nozzle for weft insertion at a higher pressure than the breeze for preventing thread removal that is constantly blown out from the main nozzle for weft insertion. Make sure to do this just before starting injection.1. For this purpose, the weft insertion air pipe between the weft insertion valve of the weft insertion air pipe line -1- connected to the weft insertion main nozzle and the weft insertion main nozzle is connected to the weft insertion air pipe connected to the weft insertion main nozzle. In order to prevent thread pulling out, an air pipe line for preventing the thread and an air pipe line for adjusting the thread position are connected in parallel, and a switching valve is interposed on the pipe line for adjusting the thread position.

E action] In the main nozzle for weft insertion immediately before weft insertion, a breeze for adjusting the yarn posture is generated by the switching operation of the switching valve, which has a higher pressure than the breeze for preventing thread removal, and this breeze for adjusting the yarn posture is generated at the tip of the weft. As a result, the posture of the tip of the weft immediately before weft insertion is adjusted. If the attitude of the weft tip is adjusted immediately before weft insertion, it is sufficient to prevent weft insertion errors, and therefore, it is possible to suppress the pressure of the breeze to a relatively low pressure for thread removal. Therefore, it is possible to reduce the breeze pressure on the weft tip during the weft insertion standby period and prevent untwisting that can lead to yarn breakage. By reducing the amount of extension from the main nozzle, it is possible to prevent the weft tips from becoming entangled with each other.

[Example] Hereinafter, an example embodying the present invention will be described based on FIG. 1.2.

? Weft insertion solenoid valves 9.10° are installed on each of the weft insertion air pipes 5°6.7.8 of the weft insertion main nozzles 1, 2, and 3.4 (four in this embodiment) of the first weft insertion. 11.1.2 is interposed, a tank for weft insertion! 3,14. I5. The high-pressure air in I6 is applied to the weft insertion main nozzle 1 based on the opening/closing control of the weft insertion electromagnetic valves 9 to 12 according to the weft insertion pattern.
~4c will be provided. Weft insertion type + IL valve 9-12
i is opened and closed by the opening/closing command from the control computer C.
The control combiator C controls each of the weft insertion electromagnetic valves 9 to 12 based on the insertion pattern input and set by the weft insertion pattern setting device 39 and the input signal from the rotary encoder 40 for detecting the rotation angle of the machine. Command opening and closing.

Pressure controllers 18, 19, 20, 21 are interposed between the weft insertion tanks 13-16 and the air source 17, and the air pressure in the weft insertion tanks 13-16 is controlled by the pressure controllers 18-16.
It can be adjusted by 21.

Main nozzles 1 to 4 for weft insertion and solenoid valve 9 for weft insertion
Air pipes 22, 23, 24, 25 for preventing thread removal and air pipes 26, 27, 28, 29 for adjusting the thread posture are connected in parallel to the air pipes 5-8 for weft insertion between has been
Thread removal prevention air pipe line 2;
31.3233 to the air source 17 via 2. The air pipes 26 to 29 for adjusting the yarn posture are connected to the breeze tank 46 via switching solenoid valves 34, 35, 36, and 37. The opening/closing is controlled based on the opening/closing command of the breeze tank 46. A pressure controller 47 is interposed between the breeze tank 46 and the air source 17, and the air pressure inside the breeze tank 46 can be adjusted by the pressure controller 47. It is.

The injection pressure curve C for each weft insertion solenoid valve 9 to 12 is shown in Figure 2.
The opening and closing of the weft insertion electromagnetic valves 9 to 12 is controlled based on the weft insertion pattern as shown by I, C2, and C3, and the weft yarns Yl, Y2 .
Y3. Any one of Y4 is selectively inserted. Each switching solenoid valve 34.35°36.37 is the injection pressure curve D! , D2
．． As shown by D3, the opening and closing are similarly controlled based on the weft insertion pattern, and the injection pressure curves D1 to D3 represent the breeze pressure caused by the air sent from the air lines 26 to 29 for adjusting the yarn posture to the main nozzles 1 to 4 for weft insertion. represent. Straight 4mL+.

L2. L3. L4 is an air pipe line 22°23. for preventing thread removal.
24 and 25 represent the injection pressure of the breeze blown out from the main nozzles 1 to 4 for weft insertion, and the injection pressure of the breeze for adjusting the thread position is set to a higher pressure than the injection pressure for preventing thread removal.

Weft yarn Y waiting to be inserted at main nozzles 1 to 4 for weft insertion
A slight breeze is constantly acting on the tips of 1 to Y4 to prevent thread removal, and this is caused by the two movements (cutting, ripping and reeding) when cutting the Ti yarn from the main weft inserting nozzle immediately after reeding. It is possible to prevent the weft tip from being removed from the weft insertion main nozzle.

For example, just before the weft insertion jet is started at the main weft insertion nozzle 1 after a slight breeze is constantly generated to prevent thread removal, the switching electromagnetic valve ↑34 is opened, and the weft insertion is started immediately before the weft insertion starts. A breeze blows from the main nozzle 1 for weft insertion to adjust the yarn position. As a result, the ia wind for adjusting the yarn position acts on the tip of the weft Y1, which is higher than the injection pressure of the breeze for preventing yarn pulling.

Therefore, although it is not sufficient to adjust the posture of the weft tip,
Set the jet of gentle breeze Y for preventing thread 4 to a pressure low enough to prevent thread pulling out, and set the jet pressure of 1 to 1 for thread posture adjustment to a high enough pressure to adjust the thread posture. By setting these values, it is possible to prevent thread pulling out, prevent thread entanglement, thread breakage (i+li+), and maintain a good thread posture.

In other words, it is sufficient to prevent mistakes in weft insertion if the position of the tip of the weft thread to be inserted is adjusted just before weft insertion begins, and only just before the start of weft insertion, a relatively high-pressure breeze is blown to straighten the weft thread. All you have to do is adjust the posture of the tip. This jetting of breeze for adjusting the yarn position is limited to a short period just before the start of weft insertion, so even if the jetting pressure is relatively high, it can lead to yarn breakage.
There is no backlash and no thread breakage occurs. By increasing the pressure of the breeze for adjusting the yarn position, it is possible to reduce the injection pressure of the breeze for preventing yarn pull-out as low as possible. The amount of extension can be suppressed. Therefore, it is possible to avoid entanglement of the weft tips with each other, and it is possible to prevent weft insertion errors caused by yarn entanglement.

This kind of breeze for adjusting the yarn posture is generated through the air pipes 26 to 29.
The switching type is also obtained by the S1 block ↑ 34 to 37 circuit configuration, and the breeze generation evening and timing are controlled based on the wind pattern input and set to the control combinator C. Therefore, the mechanism This makes it possible to easily set the appropriate timing of breeze generation without causing any complications.

In addition, lowering the injection pressure of the breeze to prevent thread removal, which is constantly injected, also leads to a reduction in air consumption.

The present invention is, of course, not limited to the embodiments described above; for example, the embodiments shown in FIGS. 3 and 4 or the embodiment shown in FIG. 5 are also possible. In the embodiment shown in Figure 3.4, the third
As shown in the figure, a switching solenoid valve 38 is interposed on the upstream side of the confluence of the air pipes 26 to 29 for adjusting the yarn posture of the main nozzles 1 to 4 for weft insertion, and curve D4. D5. D
6. As shown by D7, a breeze for adjusting the yarn posture is blown out from all the weft insertion main nozzles 1 to 4 immediately before the start of weft insertion. However, since this occurs only for a very short period of time immediately before weft insertion, there is little possibility that the weft ends will become entangled.

According to this embodiment, only one switching solenoid valve is required, which simplifies the circuit configuration and provides cost advantages.

In the embodiment shown in FIG. 5, the air line 41.4 for preventing thread removal
2, 43. Flow control valve 45A, 45 interposed on 44
T3, 45C, and 45D also serve as switching valves that switch the valve body 45b between the solid line position and the chain line position by means of an electromagnetic solenoid 45a, and thread removal is carried out via the preventive air pipes 41 to 44 to the main weft insertion valve. The amount of air flow sent to nozzles 1 to 4 is changed over. When the valve body 45b is at the solid line position, a low-pressure breeze for preventing thread removal is generated, and when the valve body 45b is at the chain line position, a high-pressure breeze for adjusting the thread position is generated. That is,
The air conduits 41 to 44 for preventing thread removal also serve as conduits for adjusting the thread posture, thereby simplifying the circuit configuration.

Moreover, the present invention is also applicable to a single-colored shed room,
In this case as well, thread removal can be prevented, untwisting can be prevented, and a good thread posture can be achieved. Furthermore, in the present invention, in the case of mixing in which weft yarns of the same type are inserted alternately or in the case of a relatively simple weft insertion pattern, a cam-driven mechanical valve is adopted as a switching pulp,
As disclosed in the above publication, the present invention can also be applied to a movable multicolor shed room in which a main nozzle for weft insertion is selectively arranged at the weft insertion position.

[Effects of the Invention] As described in detail above, in the present invention, a high-pressure breeze for adjusting the yarn position is applied to the tip of the weft immediately before the start of weft insertion, rather than a breeze for preventing thread removal at a low pressure. It is possible to suppress the injection pressure of the breeze for preventing thread removal as much as possible, thereby achieving both prevention of thread removal, prevention of thread breakage, and good thread posture. This simple circuit configuration has the excellent effect of preventing weft insertion errors.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment embodying the present invention.
The figure is an air circuit diagram, Figure 2 is a graph showing the relationship between weft insertion injection timing and breeze timing, Figures 3 and 4 show other examples, Figure 3 is an air circuit diagram, and Figure 4 is a graph showing the weft insertion injection timing. FIG. 5 is an air circuit diagram showing another example. Weft inserting main nozzles 1, 2, 3, 4, weft inserting air pipe 5° path 22, 23° path 26.27° 36.37.3 45A, 45B.

Claims (1)

[Scope of Claims] 1. In a jet loom in which a breeze for adjusting the yarn position is ejected at a higher pressure than the breeze for preventing yarn slippage that is constantly blown out from the main nozzle for inserting the weft, just before the main nozzle for inserting the weft starts to insert the weft. Weft insertion method. 2. The weft insertion air pipe between the weft insertion valve on the weft insertion air pipe connected to the weft insertion main nozzle and the weft insertion main nozzle is equipped with a weft insertion air pipe to prevent yarn from coming off from the weft insertion main nozzle. An air piping structure in a jet loom in which an air pipe line for preventing thread pulling out and an air pipe line for adjusting the thread position are connected in parallel, and a switching valve is interposed on the pipe line for adjusting the thread position.