JPH0444636Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is a multi-colored water weft system that selectively supplies pressure water to multiple weft insertion nozzles to insert multiple weft yarns according to a predetermined pattern. This invention relates to a weft insertion device for a jet loom.

<Prior Art> As a conventional weft inserting device for a multicolor water jet loom, there is one shown in FIGS. 6 and 7, for example.

Referring to FIG. 6, the two weft insertion nozzles 1a, 1
b is connected to the switching valve 3 via pipes 2a and 2b. As shown in FIG. 7, the switching valve 3 consists of a body 4 and a valve body 5 rotatably fitted therein, and the body 4 is formed with an inlet 6 and outlets 7a, 7b. Further, the valve body 5 has passages 8a, 8
A Y-shaped flow path is formed by b and 8c.
The inlet 6 of the body 4 is connected via a pipe 11 to the outlet of a pump 10 that sucks water from a constant water level tank 9 and discharges it. The pipes 2a and 2b are connected to the outlets 7a and 7b.

A lever 13 is fixed to a shaft 12 protruding from the valve body 5 of the switching valve 3, and the lever 13 is connected to a link 14.
The lever 16 is connected to one end of a lever 16 which is pivotally connected to the fixed shaft 15 via the lever 16. And lever 16
A cam follower 18 attached to the other end is urged by a spring 17 and brought into contact with a cam 19.

This cam 19 rotates at a rotation ratio of, for example, 1/4 with respect to the main shaft of the loom, and during two revolutions of the main shaft, the high portion faces the cam follower 18 and passes through the inlet 6 through the passages 8a, 8c.
for the next two revolutions.
The lower portion faces the cam follower 18 and communicates the inlet 6 with the outlet 7b via passages 8b, 8c.

Therefore, when water is pumped from the pump 10 to the switching valve 3 at a predetermined timing every rotation of the loom main shaft, pressure water is alternately fed twice to the weft inserting nozzles 1a and 1b, and the weft Wa , Wb are inserted alternately twice.

The pump 10 is constructed as shown in FIG. 8, for example.

A weft insertion water passage 22 is formed through the pump body 21, and one-way valves 23 and 24 are provided on the suction side and the discharge side, respectively. A pump passage 25 is located perpendicular to the weft insertion water passage 22.
is formed. An end portion of a hollow cylinder 26 is connected to this pump passage 25 by screwing. A hollow plunger 27 with one end closed is slidably fitted on the outer periphery of the cylinder 26. A flange 28 is formed at the open end of the plunger 27, and a flange 28 is formed at the open end of the plunger 27.
A compression spring 32 is interposed between the spring receiver 31 and the spring receiver 31 screwed into the spring 9 and fixed with a lock nut 30. Therefore, the plunger 27 is biased by the spring 32 in the direction of the compression stroke (to the left in the figure).

Further, a crank-shaped lever 34 is rotatably attached to the fixed shaft 33. One end of this lever 34 is connected to the closed end of the plunger 27 via a link 35. And lever 3
A cam follower 36 is attached to the other end of 4, and faces a cam 37 that rotates in synchronization with the main shaft of the loom.

Reference numeral 38 designates a bolt as a stopper located in the rotation path of the locking portion 39 of the lever 34. This stopper bolt 38 is screwed into a bracket 40 and fixed with a lock nut 41.

In this case, since the cam 37 rotates in the direction of the arrow in the figure, the lever 34 is gradually rotated counterclockwise by the cam 37 from the illustrated state.
As a result, the plunger 27 is moved to the right in the figure via the link 35, and the plunger 27 is moved from the fixed water level tank side to the pump passage 2 through the one-way valve 23 and the weft insertion water passage 22.
5. Inhale water. Thereafter, when the plunger 27 passes through the cam top CT of the cam 37, the plunger 27 is rapidly moved to the left in the figure by the elastic force of the spring 32, and while compressing the sucked water, the plunger 27
The water is discharged from the weft inserting water passage 22 and the one-way valve 24 to the weft inserting nozzle side. When the locking portion 39 of the lever 34 that moves together with the plunger 27 comes into contact with the head of the stopper bolt 38, the discharge stroke ends.

<Problems to be solved by the invention> By the way, even in this type of multicolor water injection loom, the operating speed of recent looms has reached 700 rpm, which causes problems such as frequent weft insertion errors. A problem has arisen in which

This is considered to be due to the following reasons. That is, even after the discharge stroke of the pump 10 is completed, the one-way valve 24 on the discharge side continues to be opened due to the advancing inertia of the weft insertion water, and water gradually spouts out from the weft insertion nozzle 1a or 1b. Then, the suction stroke of the pump 10 is started, and the one-way valve 2 on the discharge side
Even if the weft insertion nozzle 4 is closed, the weft insertion nozzle 1 is closed due to the inertia.
More water flows out from a or 1b and air flows into the nozzle instead. For this reason, during the next weft insertion, the weft insertion nozzle is filled with pressurized water and then the water jet starts, so a droplet of water containing air is jetted out at the beginning of the weft insertion, and the jetting state at the beginning of the weft insertion is e.g. If the injection direction is not stable and the loom speeds up, the weft insertion period will be limited and the rise will be rapid, which will further increase the speed of the weft.
This causes weft insertion errors.

In view of these conventional problems, the present invention minimizes the outflow of water from the weft inserting nozzle after the pump's discharge stroke to ensure stable weft inserting from that nozzle. The purpose is to ensure that it is carried out.

<Means for solving the problem> For this reason, the present invention selectively supplies pressurized water to a plurality of weft insertion nozzles via a switching valve from a pump that performs a discharge stroke for a predetermined period of time to perform weft insertion. In the switching valve, the switching valve includes a body having an inlet communicating with the pump and a plurality of outlets communicating with the plurality of weft inserting nozzles, and is rotatably fitted into the body, and the switching valve and a valve body having a passage that selectively communicates with any of the plurality of outlets, and the valve body includes:
The passageway includes the inlet and one of the plurality of outlets.
a first rotational position in which the passageway communicates with the inlet and another one of the plurality of outlets; and a second rotational position in which the passageway communicates with the inlet and another one of the plurality of outlets; The switching valve control device is provided to control the rotation of the pump to a third rotation position where the pump and the weft insertion nozzle are not connected at the same time.

<Operation> That is, almost at the same time as or immediately after the end of the discharge stroke of the pump, the switching valve is controlled to the neutral position to cut off the flow of water due to inertia from the pump to the selected weft inserting nozzle, thereby ending the discharge stroke. This suppresses the outflow of water from the weft insertion nozzle after the weft insertion and the inflow of air to replace it, thereby stabilizing the jetting condition from the beginning of the next weft insertion.

<Example> An example of the present invention will be described below based on FIG. 1. However, the basic configuration is the same as the conventional example, although the layout is different, and the only difference is that a cam 50 with a different profile is used in place of the conventional cam 7. Therefore, parts corresponding to the conventional example are designated by the same reference numerals. will be added and the explanation will be omitted.

The cam 50 as a switching valve control device has peaks T ₁ and T ₂ on the same radius T, troughs B ₁ and B ₂ on the same radius B, and the same ridge between the radii T and B. Intermediate portions M ₁ to _{M 4} located on radius M are formed. The formation order is T ₁ , M ₁ , T ₂ , M ₂ , B ₁ , M ₃ ,
The order is B ₂ and M ₄ .

When the peaks T ₁ and T ₂ come into contact with the cam follower 18, the inlet 6 and the outlet 7a communicate with each other through the passages 8a and 8c as shown in FIG. 2, thereby connecting the pump 10 and the weft insertion nozzle 1a. When the troughs B ₁ and B ₂ come into contact with the cam follower 18, the inlet 6 and the outlet 7b communicate with each other through the passages 8b and 8c, as shown in FIG. 3, thereby connecting the pump 10 and the weft insertion nozzle 1b. Further, when the intermediate portions M ₁ to _{M 4} and the cam follower 18 come into contact with each other, they are in a neutral position as shown in FIG. 4, and the communication between the inlet 6 and the outlets 7a and 7b is cut off.

The intermediate portions M ₁ to _{M 4} are designed to come into contact with the cam follower 18 at the same time as or immediately after the end of the discharge stroke of the pump 10, and to separate from the cam follower 18 by the start of the next discharge stroke.

Next, the operation will be explained with reference to FIG. 5. In addition, Figure 5 shows one revolution of the loom main shaft including the first weft insertion of the Futakoshi change weft Wb.
The weft insertion period is set between 110° and 250°. In addition, the pump 10 (plunger 27) performs a suction operation up to 80 degrees by the pump drive cam 37, stops at the cam top CT, performs a discharge operation from 100 degrees to 200 degrees, remains stationary for a while, and then reaches 240 degrees. The setting is such that the inhalation operation starts again from this point.

Even before the first weft insertion of the weft yarn Wb is started, the trough _B1 of the cam 50 is in contact with the cam follower 18, and the inlet 6 and outlet 7b of the switching valve 3 are in communication.
When the weft insertion period begins in this state, the discharge stroke of the pump 10 is started from 100°, and pressurized water is supplied to the weft insertion nozzle 1b. As a result, pressure water is ejected from the weft insertion nozzle 1b, and the weft thread Wb is immediately after 110 degrees.
The restraint is released and weft insertion begins.

Then, the discharge stroke of the pump 10 ends at 200°.

Immediately after this, switching by the cam 50 is started from 210°, and the intermediate portion M ₃ contacts the cam follower 18 to switch the switching valve 3 to the neutral position shown in FIG. 4, and this state continues until 270°. As a result, the switching valve 3 becomes in a state where the inlet 6 and the outlets 7a, 7b are not communicated with each other,
The water channel between the pump 10 and the weft insertion nozzle 1b is blocked. For this reason, the constant water level tank 9 and the weft insertion nozzle 1
Even if an inertial water flow toward the weft insertion nozzle 1b attempts to occur in the waterway between the switching valve 3 and the weft insertion nozzle 1b, it is forcibly blocked at the switching valve 3, and as a result, the flow in the waterway between the switching valve 3 and the weft insertion nozzle 1b There is only an inertial flow, and the amount of water flowing out from the weft insertion nozzle 1b is small, and a small amount of air corresponding to the flow rate remains in the weft insertion nozzle 1b. During this time
Weft thread Wb is restrained at 250° and weft insertion is completed.

Next, the trough _B2 of the cam 50 contacts the cam follower 18 to reconnect the inlet 6 and outlet 7b of the switching valve 3, and prepares for the second weft insertion of the weft yarn Wb.

During the next weft insertion, the pressure water from the pump 10 first fills the weft insertion nozzle 1b and then jets out from the weft insertion nozzle 1b, but as mentioned above, only a small amount of water flows out from the weft insertion nozzle 1b. Therefore, by 110° when weft insertion starts, weft insertion nozzle 1b
The jet from is stable enough. Therefore, the weft yarn inserted by this jet stream is also stably inserted. After the discharge stroke of the pump 10 is completed, the switching valve 3 similarly enters the shut-off state.

It is preferable that the switching valve 3 is shut off as soon as possible after the discharge stroke ends.

Although the case of two-koshi exchange has been described above, it goes without saying that the present invention can also be applied to one-koshi exchange or multi-color free exchange.

<Effects of the invention> As explained above, according to the invention, it is possible to suppress the outflow of water from the weft inserting nozzle after the discharge stroke of the pump, and to reduce the amount of air flowing in instead. Disturbances such as the direction of water jetting from the nozzle during weft insertion can be quickly resolved, resulting in the effect that good weft insertion can be performed. In addition, since the switching valve is a rotary type, the switching valve control device can be connected directly to the valve body, making it possible to create a structure that does not cause any impact.As a result, it has excellent durability even at high speeds, and also has impact noise. The work environment also improves because it does not occur.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the switching valve portion showing an embodiment of the present invention, Figs. 2 to 4 are sectional views of the switching valve in different operating states, Fig. 5 is a diagram showing the operation timing, and Fig. 6
The figure is a perspective view showing a conventional example, FIG. 7 is a sectional view thereof,
FIG. 8 is a detailed view of the pump. 1a, 1b...Weft insertion nozzle, 3...Switching valve,
DESCRIPTION OF SYMBOLS 10...Pump, 50...Cam, _T1 , _T2 ...Mountain part, _B1 , _B2 ...Valley part, _M1 - _M4 ...Middle part.

Claims (1)

[Claims for Utility Model Registration] A plurality of weft insertion nozzles 1a, 1 are connected via a switching valve 3 from one pump 10 that performs a discharge stroke for a predetermined period of time.
In the weft inserting device for a multicolor water jet loom, which performs weft inserting by selectively supplying pressurized water to
and a plurality of outlets 7a, 7b communicating with the plurality of weft insertion nozzles 1a, 1b, respectively; a body 4 rotatably fitted into the body 4, the inlet 6 and the plurality of outlets 7a, 7b; a valve body 5 having passages 8a, 8b, 8c selectively communicating with any of the inlet 6 and the plurality of outlets 7a, 7b; one of them
a first rotational position communicating with the passageway 8;
a, 8b, 8c are the inlet 6 and the plurality of outlets 7
a, 7b, and the passages 8a, 8b, 8c connect the pump 10 and the weft insertion nozzles 1a, 1b at the end of the discharge stroke of the pump 10. A weft inserting device for a multicolor water jet loom, characterized in that it has a switching valve control device 50 that performs rotational control to a third rotational position where it is not connected.