JPH10273853A - Weft inserting apparatus in jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weft inserting apparatus capable of avoiding problems of air backflow and durability. SOLUTION: Compressed air is supplied from a pair of air tanks 19 and 20 to auxiliary nozzle groups 13-16 for weft inserting. The auxiliary nozzle groups 13-16 for weft inserting are connected through a common line 25 to the air tank 19 of higher pressure and a pair of solenoid valves 26 and 27 are laid in the common line 25. The air tank 20 of lower pressure is connected through an exclusive line 28 to the common line 25 between a pair of the solenoid valves 26 and 27 and a check valve 26 is laid in the exclusive valve 28. When a weft Y1 is inserted, the solenoid valves 17 and 26 are excited and when weft Y2 is inserted, the solenoid valves 18 and 27 are excited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion device in a jet loom for weft insertion by air injection.

[0002]

2. Description of the Related Art In the case of inserting a plurality of kinds of wefts in a jet loom, Japanese Utility Model Laid-Open No. 59-109786 discloses
JP-A-59-125942, JP-A-5-2307
As disclosed in Japanese Patent Publication No. 39, measures are taken to set the pressure of air injection from the weft insertion nozzle for each type of weft.

In the weft insertion device disclosed in Japanese Utility Model Laid-Open Publication No. 59-109786 and Japanese Patent Laid-Open Publication No. 59-125942, a switching valve is interposed on a supply pipe between a pair of air tanks having different internal pressures and a sub-nozzle. The pressure of the air jet from the weft insertion nozzle is controlled by switching the valve.

[0004] In the device disclosed in Japanese Patent Application Laid-Open No. Hei 5-230739, a pair of electromagnetic switching valves connected in parallel to the sub-nozzle are each connected to an air tank via a movable throttle valve.
The pressure of the air injection from the weft insertion nozzle can be controlled by switching the use of the pair of electromagnetic switching valves.

[0005]

Problems to be Solved by the Invention
In the mechanical switching valve disclosed in FIG. 7 of the drawing of Japanese Patent Publication No. 42, a configuration in which a pair of small-diameter portions formed in a rod-shaped valve body simultaneously communicates with each connecting pipe at the moment of switching movement of the valve body. It has become. In such a configuration, the air in the high-pressure side air tank flows back to the low-pressure side air tank, and the pressure in the low-pressure side air tank fluctuates. Such pressure fluctuations have an adverse effect on weft insertion.

The switching valve disclosed in Japanese Utility Model Laid-Open Publication No. 59-109786 is an electromagnetic switching valve. However, in both the mechanical switching valve and the electromagnetic switching valve, the reverse flow of air during the switching movement of the valve body is prevented. Complete prevention is difficult due to the structure of the switching valve. Further, the sliding portion must be sealed in order to prevent air leakage from the sliding portion of the valve body. However, such a seal portion is easily worn due to frequent reciprocating operation of the valve body.

In the device disclosed in Japanese Patent Application Laid-Open No. 5-23039, the pressure change repeatedly acts on the valve element of the movable throttle valve at high speed due to frequent opening and closing of the electromagnetic switching valve. Due to the structure of the throttle valve, the high-speed repetitive action of pressure fluctuation causes the valve body and its valve seat to repeatedly contact and separate at high speed. High-speed repetitive contact between the valve body and its valve seat causes breakage of the valve body or valve seat, and there is a problem in durability of the weft insertion device.

[0008] An object of the present invention is to provide a weft insertion device capable of avoiding the problems of air backflow and durability.

[0009]

According to the present invention, there is provided:
A plurality of tanks having different pressures for storing air supplied to an air injection nozzle for applying air injection to the weft yarn, and a common tank interposed on a common conduit for supplying air to the air injection nozzle from the plurality of tanks An on-off valve, a dedicated pipe line connected to each tank so as to exclusively supply air of the plurality of tanks to the common on-off valve side, and a tank having a lowest pressure among the plurality of tanks. The weft insertion device is provided with a backflow prevention means interposed on a dedicated pipeline and an on-off valve for selecting pressure interposed on each dedicated pipeline of a tank other than the tank having the lowest pressure.

When the pressure selection on-off valve and the common on-off valve are opened, air is supplied to the air injection nozzle from a tank corresponding to the open pressure selection on-off valve. If all of the plurality of pressure selecting on-off valves are closed and the common on-off valve is opened, air is supplied to the air injection nozzle from a tank corresponding to the backflow prevention means. Frequent switching of the common on-off valve does not damage the backflow prevention means.

According to the second aspect of the present invention, the backflow prevention means is interposed on a dedicated pipe downstream of the pressure selecting on / off valve installed corresponding to the tank other than the tank having the highest pressure.
These check valves prevent the air pressure in the tank on the upper pressure side from acting on the on-off valve for pressure selection corresponding to the tank on the lower pressure side.

According to the third aspect of the present invention, the higher pressure side pressure adjusting means for adjusting the pressure in the higher pressure side tank of the plurality of tanks, the higher pressure side pressure adjusting means and the higher pressure side pressure adjusting means. The weft insertion device is provided with a pressure lowering side pressure adjusting means interposed on the supply pipe between the tank and the pressure adjusting means on the next higher pressure level than the pressure adjusting means on the higher pressure side.

[0013] The pressure set by the pressure adjusting means on the lower pressure side is equal to or lower than the pressure set by the pressure adjusting means on the upper pressure side even if the pressure setting is incorrect. In the invention of claim 4, the weft insertion auxiliary nozzle for applying air to the weft flying in the opening of the warp is the air injection nozzle.

The present invention is suitable for application to an auxiliary nozzle for weft insertion.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, a pair of weft insertion main nozzles 11 and 12 inject wefts Y1 and Y2 into a not-shown warp opening according to a preset weft insertion pattern. The weft insertion auxiliary nozzle groups 13, 14, 15, 16 relay-inject from the weft insertion main nozzles 11, 12 side.
This relay injection is performed on the weft yarn Y1, which is injected into the opening of the warp yarn.
Tow Y2.

The weft insertion main nozzles 11 and 12 are connected to an air tank (not shown) via electromagnetic on-off valves 17 and 18, and the air tank receives a supply of pressurized air from a pressurized air supply source (not shown). The solenoid on-off valves 17 and 18 are controlled to excite and demagnetize according to the weft insertion pattern.

The weft insertion auxiliary nozzle groups 13 to 16 are supplied with pressurized air from a pair of air tanks 19 and 20. The air tank 19 is connected to the pressure air supply source via a supply line 21, and a pressure regulator 22 is provided on the supply line 21.
Is interposed. The pressure regulator 22 is a pressure regulator for setting the pressure in the air tank 19.

The air tank 20 is connected to a supply line 21 between the pressure regulator 22 and the air tank 19 via a supply line 23, and a pressure regulator 24 is interposed on the supply line 23. . The pressure regulator 24 is a pressure regulator for setting the pressure in the air tank 20.

In the present embodiment, the pressure in the air tank 19 is set to be higher than the pressure in the air tank 20.
0 is the lower pressure tank.

The auxiliary nozzle groups 13 to 16 for weft insertion are connected to the air tank 19 of higher pressure via a common line 25 and a dedicated line 38, and an electromagnetic on-off valve 26 is interposed on the common line 25. ing. The solenoid valve 27 is interposed on the dedicated conduit 38. The lower pressure air tank 20 is connected to the common line 25 via a dedicated line 28, and a check valve 29 is interposed on the dedicated line 28.

The solenoid valves 17, 18, 26, 27 are controlled by a control computer C to excite and demagnetize. The control computer C controls the electromagnetic on-off valve 1 based on the loom rotation angle information obtained from the rotary encoder 39 for detecting the loom rotation angle.
7, 18, 26, and 27 are controlled to be excited and demagnetized. As shown in FIG. 2, when the weft Y1 is inserted into the weft, the solenoid on-off valve 17,
26 is excited. By the excitation of the electromagnetic on-off valve 26, the pressure air in the lower air tank 20 is supplied to the weft insertion auxiliary nozzle groups 13 to 16. As shown in FIG. 3, the weft Y2
When the weft is inserted, the electromagnetic on / off valves 18, 26, 27 are excited. When the electromagnetic on-off valve 27 is excited, the pressure air in the air tank 19, which is higher in pressure, is turned into auxiliary weft insertion nozzle groups 13-1.
6. The excitation period of the electromagnetic switching valve 27 is set to be longer than the excitation period of the electromagnetic switching valve 26 and to include the excitation period of the electromagnetic switching valve 26.

The valve element 271 in the solenoid on-off valve 27 opens a flow path in the solenoid on-off valve 27 by excitation of the solenoid 272. When the valve body 271 moves in the opening direction, the air flows from the input port 273 to the output port 274. The solenoid on-off valves 17, 18, and 26 have the same internal structure.

In the first embodiment, the following effects can be obtained. (1-1) When the weft is inserted into the weft, the solenoid on-off valve 26 is always controlled to be demagnetized. The electromagnetic on-off valve 26 is a common on-off valve for the air tank 19 having a higher pressure and the air tank 20 having a lower pressure. Electromagnetic on-off valve 2 interposed on dedicated conduit 28
7 is excited at the time of weft insertion, the pressure air of the higher pressure air tank 20 is selected for weft insertion, and if the electromagnetic on / off valve 27 is demagnetized at the time of weft insertion, the pressure air of the higher pressure air tank 19 is selected for weft insertion. Selected.

The check valve 29, which is a check valve, receives pressure fluctuations caused by frequent switching of the common on-off valve 26, but the check valve 29 is urged in the closing direction and remains closed. Therefore, the check valve 29 is not damaged by the pressure fluctuation, and there is no problem of reverse flow of air from the higher pressure air tank 19 to the lower pressure air tank 20 and durability. (1-2) When the pressure of the air tank 20 is higher than the pressure of the air tank 19, the solenoid on-off valve 2 for selecting pressure is used.
7, the pressure acting on the valve body in the solenoid on-off valve 27 from the output port 274 side exceeds the pressure acting on the valve body 271 from the input port 273 side of the solenoid on-off valve 27. The valve body 271 opens the electromagnetic on-off valve 27 against the pressure applied from the input port 273 side of the electromagnetic on-off valve 27. Therefore, when the pressure in the air tank 20 is higher than the pressure in the air tank 19, the differential pressure between the pressure on the output port 274 and the pressure on the input port 273 urges the valve 271 in the opening direction. Exciting and demagnetizing the solenoid on-off valve 27 in such a state impairs the durability of the solenoid on-off valve 27.

The pressure set by the pressure regulator 24 which is the pressure regulator on the lower side of the pressure is temporarily
Even if the pressure setting by mistake is made, the pressure becomes lower than the pressure set by the pressure regulator 22 which is the pressure adjusting means on the upper pressure side. Therefore, the pressure acting on the valve body 271 from the output port 274 side does not exceed the pressure acting on the valve body 271 from the input port 273 side.

Next, a second embodiment of FIG. 4 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, a weft insertion main nozzle 33 for injecting a third weft Y3 is connected to the pressure air supply source via an electromagnetic on-off valve 34. A third air tank 30 is connected to a supply line 23 between the pressure regulator 24 and the air tank 20 via a supply line 31, and a pressure regulator 32 is interposed on the supply line 31. . The pressure regulator 32 is a pressure regulator for setting the pressure in the air tank 30. In this embodiment, the pressure in the air tank 30 is set lower than the pressure in the air tank 20, the air tank 20 is higher in pressure than the air tank 30, and the air tank 19 is higher in pressure than the air tank 20. is there.

An electromagnetic on-off valve 36 for selecting pressure is interposed on the dedicated conduit 28 connected to the air tank 20. The internal structure of the electromagnetic on-off valve 36 is the same as that of the electromagnetic on-off valve 27. A check valve 37 is interposed on the dedicated conduit 28 downstream of the electromagnetic on-off valve 36. The air tank 30 having the lowest pressure is connected to a dedicated pipe 28 between the electromagnetic on-off valve 36 and the common pipe 25 via a dedicated pipe 35, and a check valve 29 is interposed on the dedicated pipe 35. Have been. At the time of weft insertion of the weft Y3, the electromagnetic on-off valves 34 and 26 are excited, and the pressure air of the air tank 30 having the lowest pressure is supplied to the auxiliary nozzle groups 13 to 13 for weft insertion.
16.

In this embodiment, the same effects as in the first embodiment can be obtained. The check valve 37 is a solenoid on-off valve 2
6, the pressure of the air tank 19 is prevented from acting on the valve body in the solenoid on-off valve 34 from the output port side of the solenoid on-off valve 34, and the output port side and the input port side of the solenoid on-off valve 34 Does not urge the valve element in the solenoid on-off valve 34 in the opening direction.

The present invention can be applied to a case where four or more kinds of wefts are inserted. The present invention can also be applied to an apparatus that captures the leading end of a weft inserted weft by a jet airflow from a nozzle at the end of the weft and applies tension to the weft. Such a tensioning device is part of a weft insertion device. In this case, the nozzle for capturing the leading end of the weft receives air supply from a plurality of air tanks having different pressures according to the type of the weft as in the above-described embodiment.

[0031]

As described above in detail, according to the present invention, the backflow preventing means is interposed on the dedicated line of the tank having the lowest pressure among the plurality of tanks having different pressures, and is provided on the dedicated line of another tank. Since the on-off valve for pressure selection is interposed, an excellent effect of avoiding the problem of air backflow and durability can be obtained.

[Brief description of the drawings]

FIG. 1 is an air piping diagram showing a first embodiment of the present invention.

FIG. 2 is an air piping diagram showing a state in which one weft is injected.

FIG. 3 is an air piping diagram showing a state where the other weft is injected.

FIG. 4 is an air piping diagram showing a second embodiment.

[Explanation of symbols]

13-16: an auxiliary nozzle group for weft insertion, which is a weft insertion nozzle, 19: an air tank having a higher pressure, 20: an air tank having a lower pressure, 21, 23 ... a supply line, 22, 24 ... a pressure regulator, 25 ... Common conduit, 26 ... common solenoid on-off valve, 2
7: solenoid on-off valve for pressure selection, 28, 38: dedicated pipeline,
29: check valve as a backflow prevention means.

Claims (4)

[Claims] 1. A jet loom in which weft is inserted by an air injection action, wherein: a plurality of tanks having different pressures for storing air supplied to an air injection nozzle for applying an air injection to the weft; A common on-off valve interposed on a common conduit for supplying air to the air injection nozzle, and a dedicated on-off valve connected to each tank so as to exclusively supply air from the plurality of tanks to the common on-off valve side. A pipe; a backflow preventing means interposed on the dedicated pipe of the lowest pressure tank of the plurality of tanks; and a pressure selection interposed on each dedicated pipe of a tank other than the lowest pressure tank. Weft insertion device in a jet loom equipped with an on-off valve for use. 2. The jet loom as claimed in claim 1, wherein a backflow preventing means is provided on a dedicated pipe downstream of the pressure selecting on / off valve provided corresponding to a tank other than the tank having the highest pressure. Putting device. 3. A high-pressure side pressure adjusting means for adjusting a pressure in a high-pressure side tank of the plurality of tanks, and a pressure adjusting means between the high-pressure side pressure adjusting means and the high-pressure side tank. 3. The pressure lowering side pressure adjusting means interposed on the supply pipe and adjusting the pressure in the tank of the next higher pressure order than the pressure upper side pressure adjusting means. A weft insertion device for a jet loom according to claim 1. 4. The jet according to claim 1, wherein the air injection nozzle is a weft insertion auxiliary nozzle for applying air to a weft flying in an opening of a warp. Weft insertion device in the room.