JPH0583648B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a fluid switching device for a fluid jet loom.

BACKGROUND OF THE INVENTION In recent years, with the trend toward higher speed weaving machines, fluid jet looms have been increasingly used. In such a loom, it is important to control the fluid jet in the main weft insertion nozzle or in the auxiliary nozzle for assisting the flight of the weft ejected from the nozzle into the warp opening. This control is performed by controlling the opening and closing operations of a valve that opens and closes a fluid passage from a fluid supply source to the main nozzle. Conventionally, the opening and closing operations of valves have been performed by obtaining power from the drive source of the loom via mechanical means (gear mechanism, cam mechanism, etc.). However, when using this control method, it becomes extremely troublesome to change the start and stop of fluid jetting in response to changes in weaving conditions, such as changes in weaving width.

Therefore, a method using an electromagnetic valve mechanism that uses an electromagnetic solenoid to open and close the valve may be considered. According to this control method, the start and stop times of fluid injection are changed by changing the start and stop times of energization to the electromagnetic solenoid, so fluid injection can be controlled very easily. The use of electromagnetic valve mechanisms also means that automation of the loom can be accommodated.

Conventionally, as an electromagnetic valve mechanism, those shown in FIGS. 1 and 2 have been used. When the solenoid 2 in the container 1 is energized and the plunger 3 is attracted to the core 4, the plunger pin 3 is moved as shown in FIG.
a pushes down the valve 7 against the spring 6 in the housing 5, and the fluid passage is opened. Then, the fluid flows from the input port 5a to the output port 5b along the arrow shown in the figure. When the solenoid 2 is demagnetized, the valve 7 is pushed upward by the spring 6, closing the fluid passage.

In this mechanism, as the solenoid 2 is excited and demagnetized, the plunger 3 collides with the core 4 and slides on the inner peripheral surface of the guide cylinder 8, and the plunger pin 3a slides inside the core 4, etc. The structure is complex and prone to damage and wear. Therefore, when the conventional electromagnetic valve mechanism is used to control the fluid injection in a fluid injection loom (it is necessary to open and close the valve approximately 500 to 1000 times per minute), the solenoid side may be damaged or deteriorated in a short period of time. However, the electromagnetic valve mechanism becomes unusable in a short period of time.

Further, as the solenoid 2 is demagnetized, the valve 7 returns to the state of closing the fluid passage, but since this return operation is performed by the spring 6, the response is poor and there is a risk that it will not be able to follow the high-speed operation of the fluid injection type loom. be.

Purpose The present invention has been made in consideration of the above-mentioned problems, and its purpose is to have excellent durability and responsiveness,
Another object of the present invention is to provide a fluid switching device for a fluid jet loom having a simple structure.

Composition: This is a solenoid valve interposed between the fluid source and the injection part of a fluid jet loom, and is a single valve consisting of a valve for opening and closing the fluid passage formed in the solenoid valve, and a magnet directly connected to the valve. A movable member, and a pair of solenoids that are arranged opposite to each other in the moving direction of the movable member and generate a magnetic field for opening and a magnetic field for closing the valve, and both solenoids are electrically connected by the same winding. In addition to connecting to
A configuration is adopted in which the winding directions of the windings in the coil are set to be opposite to each other.

Embodiment Examples 3 to 6 below are examples embodying the present invention.
To explain based on the figure, weft supply section (not shown)
The weft Y supplied from the gripper 30 which is opened and closed in synchronization with the weft insertion timing is ejected by riding on the jet fluid from the weft insertion main nozzle 31. The weft yarn Y ejected from the same nozzle 31 is transferred to a large number of weft yarn guides 33 and 34 arranged in parallel on the slay 32.
The auxiliary nozzle 35 is inserted into the weft guide path S formed by the weft guide 34 and is erected facing the weft guide 34.
The flight is assisted by a jet of fluid from the

The fluid injected from the main nozzle 31 is supplied from the first air tank 36 via the fluid switching device 37, and the fluid injected from the auxiliary nozzle 35 is supplied from the second air tank 38 to the fluid switching device 39 (in FIG. (Only one is shown and the others are omitted). The fluid switching device 37 opens and closes the fluid passage in synchronization with the weft insertion timing.
The fluid switching device 39 is configured to sequentially open and close the fluid passage from the weft insertion side to the opposite weft insertion side in synchronization with the flying timing of the weft yarn Y.

Since each of the fluid switching devices 37 and 39 has the same structure, the fluid switching device 37 for the main nozzle 31 will be described next.

A pair of solenoids 10 and 11 are arranged facing each other in series in the container 9, and both solenoids 1
Between 0 and 11, a magnet 12 as a movable member is fixed to a shaft 15 that is supported by bearings 13 and 14 so as to be slidable in the vertical direction. Both solenoids 10 and 11 are electrically connected by the same winding, but each solenoid 10,
Since the winding directions of the coils 11 are set to be opposite to each other, when both solenoids 10 and 11 are energized, the same magnetic pole is generated on the opposing sides of both solenoids 10 and 11.

A housing 16 is fixed to the lower end of the container 9, and the shaft 1 is placed inside the housing 16.
The valve 17 connected and fixed to the shaft 15
It is housed so as to be slidable in the same direction as the housing 16, so that the fluid passage within the housing 16 can be opened and closed. The valve 17 is restricted from moving downward by a stopper portion 18a of the cover 18.

Now, as shown in Figure 6a, negative voltage (-V1)
is applied to the solenoids 10 and 11, and the fourth
As shown in the figure, the magnet 12 connects to the solenoid 1.
It is suctioned and held on the 0 side, and the valve 17 closes the fluid passage. Negative voltage (-
When V1) is switched to a positive voltage (+V2), the magnetic poles on the opposing sides of each solenoid 10 and 11 are reversed, generating a magnetic field for opening the valve, repelling the magnet 12 from the solenoid 10 side, and It is attracted to the side. Therefore, magnet 1
2 moves toward the solenoid 11 as shown in FIG. 5, and the valve 17 opens the fluid passage while being in contact with the stopper portion 18a. As a result, the fluid supplied from the first air tank 36 flows from the input port 16a side to the output port 16b side with a slight delay from the rotation angle θ1 of the loom, as shown in FIG. 6b, and flows into the weft insertion main nozzle. It is injected from 31. The positive voltage (+V2) is switched to a positive voltage (+V1) for attracting and holding the magnet 12 at the rotation angle θ2 of the loom, and the application of this positive voltage (+V1) is continued until the rotation angle θ3 of the loom. During this time, the magnet 12 is attracted and held to the solenoid 11 side, and the fluid passage is kept open.

When the positive voltage (+V1) is switched to negative voltage (-V2) at the rotation angle θ3 of the loom, both solenoids 1
The magnetic poles on opposite sides of magnets 0 and 11 are reversed to generate a magnetic field for closing the valve, and magnet 12 closes solenoid 1.
While being repulsed from the 1 side, it is also attracted to the solenoid 10 side. Therefore, the magnet 12 moves toward the solenoid 10, and the valve 17 closes the fluid passage. As a result, the supply of fluid is stopped slightly later than the rotation angle θ3 of the loom, as shown in FIG. 5b, and the fluid injection from the weft insertion main nozzle 31 is stopped. The negative voltage (-V2) is switched to a negative voltage (-V1) for attracting and holding the magnet 12 at the rotation angle θ4 of the loom.
is suctioned and held on the solenoid 10 side, and the fluid passage is held in a closed state.

Subsequent fluid injection from the weft insertion main nozzle 31 is controlled in the same manner as described above.

This embodiment has a simpler structure on the solenoid side than the conventional structure, has fewer sliding parts, and does not have any collision parts. Therefore,
Damage and wear on the solenoid side are very effectively prevented, and the fluid switching device of the present invention can sufficiently withstand high-speed operation and long-term use in fluid jet looms.

Note that it is desirable that the housing 16 and the valve 17 be made of a material with excellent self-lubricating properties and wear resistance. For example, a combination in which the housing 16 is made of copper or stainless steel and the valve 17 is made of polyimide resin can be considered.

Furthermore, since the fluid passage opening/closing operations of the valve 17 are actively performed based on the magnetic pole reversal of the solenoids 10 and 11, the responsiveness is very good and it is possible to sufficiently follow the high-speed operation of the fluid injection type loom. .

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the cores may be inserted into the solenoids 10 and 11 without contacting the magnet 12. Further, in the above embodiment, a negative voltage (-V1) for attracting and holding the magnet was applied to the solenoids 10 and 11 even when the fluid passage was open.
Since the fluid passage can be held open by the pressure of the fluid, the voltage for attracting and holding the magnet can be omitted when the fluid passage is opened.

Furthermore, in the embodiment described above, the shaft 15 and the valve 17 may be connected with a spring or rubber, etc. to alleviate the collision between the housing and the valve 17, or the valve 17 may be connected with a bolt and a lock nut instead of the stopper portion 18a. The amount of movement may be adjustable, and in this way, the amount of movement of the valve can be adjusted to the minimum amount that can ensure the most appropriate flow rate of fluid, thereby extending the life of the valve.

Effects As detailed above, in the present invention, a pair of solenoids whose magnetism can be reversed is arranged facing each other in series, and a valve for opening and closing a fluid passage is connected to a magnet disposed between the pair of solenoids. Therefore, although it has a simple structure, it is highly durable, and has the effect of improving responsiveness by actively opening and closing the fluid passage of the valve, making it an industrial choice as a fluid switching device in fluid jet looms. This is an excellent invention for use.

[Brief explanation of the drawing]

Fig. 1 is a joint sectional view showing a conventional electromagnetic valve mechanism, Fig. 2 is a longitudinal sectional view showing the operating state of the same mechanism,
3 to 5 show an embodiment embodying the present invention, FIG. 3 is a perspective view of the main part showing the passage system of the jetted fluid, and FIG. 4 is a vertical cross-section showing the fluid passage closed state in the fluid switching device. 5 is a longitudinal cross-sectional view showing the fluid passage in the open state, FIG. 6a is a graph showing the applied voltage, and FIG. 6b is a graph showing the fluid ejection state. Solenoid...10, 11, magnet as a movable member...12, valve...17, fluid switching device...
37, 39.

Claims (1)

[Claims] 1 An electromagnetic valve interposed between the fluid source and the injection part of a fluid injection loom, which is a single valve consisting of a valve for opening and closing a fluid passage formed in the electromagnetic valve, and a magnet directly connected to the valve. It consists of a movable member and a pair of solenoids that are arranged opposite to each other in the direction of movement of the movable member and generate a magnetic field for opening and a magnetic field for closing the valve, and both solenoids are electrically connected by the same winding. Along with connecting,
1. A fluid switching device for a fluid jet loom, characterized in that the winding directions of the windings in the coil are set to be opposite to each other.