JP2000290859A - Control device for weft insertion in water jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for weft insertion for a water jet loom capable of preventing the generation of peak pressure in start of weft inserting jet, keeping a constant jet pressure for a constant time to insert weft. SOLUTION: This control device for weft insertion for a water jet loom, inserting weft by a high pressure water jet, characteristically has a high pressure supplying pump 1 independently driven from the drive of a loom, a regulator 1a always keeping the pressure of the pump constant, a switch cam 4 having top of the same diameter of >=90 deg. from the center of rotation fixed on an axis 5 synchronously operated with the rotation of the loom, and an actuating lever 3 driven following the cam face of the switch cam 4 to control the switch valve switching the supply of the high pressure water.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion control device in a water jet loom.
The present invention relates to a weft insertion control device capable of stabilizing weft flight during weft insertion and achieving energy saving.

2. Description of the Related Art A plunger type pump has been frequently used as a weft insertion pump for a water jet loom. Hereinafter, a conventional weft insertion device using a plunger pump will be described with reference to FIG. In the figure, 20 is a drive cam, 21 is the top of the drive cam, 22 is a cam floor,
23 is a spring, 24 is a gentle descending part of the drive cam 20, 2
Numeral 5 denotes a sudden descending portion of the drive cam 20, 26 denotes a plunger, and θ denotes a water injection section. In the above-mentioned conventional apparatus, the drive cam 20 has a gentle descent portion 24 having a small descent rate at which the cam floor 22 can follow the cam surface by the spring 23 from the vertex 21 to a predetermined range, and thereafter the cam floor 22 and the cam surface are separated. The configuration is provided with a rapid descent section 25 with a large descent rate. However, in the conventional apparatus described above, the amount of deflection of the spring 23 is adjusted to adjust the fluid pressure and the flow rate, and the peak pressure and the injection time are adjusted, or the injection time is adjusted by adjusting the stroke length of the piston. Further, the peak pressure and the injection time are adjusted by adjusting the throttle of the nozzle. Further, in the above-described weft insertion control by the conventional plunger type pump, in the process where the drive cam 20 rotates clockwise from the minimum radius position, the plunger 26 is pulled out to suck water, and at the same time, the spring 23 Is compressed, the suction ends when the cam follower 22 reaches the maximum radius of the driving cam 20, and the pressurization of water by the restoring force of the compressed spring 23 starts. When the crankshaft is released, a pressure peak occurs at the initial stage of water injection as shown in FIG. 2, and the pressure attenuates as the crank angle advances. Therefore, yarn breakage occurs due to the peak pressure at the beginning of weft insertion, or peak pressure occurs at the beginning of weft insertion, and the pressure decreases toward the end of weft insertion, so that the flight speed of the weft is slow at the end of weft insertion. This causes troubles such as show topics and missed feelers. Also, in wide weaving, it is required to maintain a constant injection pressure for a certain period of time. However, in the conventional apparatus, if the injection time is lengthened, the initial peak pressure also increases, and a large amount of high-pressure water is inevitably consumed. Is done.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional apparatus. In a weft insertion control in a jet loom weft insertion apparatus, the injection pressure is kept constant and the injection time is controlled. To provide a weft insertion device that prevents the occurrence of peak pressure in the initial stage of weft insertion and performs weft insertion with the required amount of injection pressure, thereby stabilizing weft flight and saving energy. It is.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a high-pressure water supply pump driven independently of a loom in a water jet loom in which weft insertion is performed by jetting high-pressure water. A regulator that keeps the pump pressure constant at all times, an opening / closing cam portion fixed to a shaft that operates in synchronization with the rotation of the loom and having a top portion having the same radius of 90 ° or more from the center of rotation, and a cam surface of the opening / closing cam portion A weft insertion control device for a water jet loom, comprising an operating lever that drives an open / close valve that switches the supply of high-pressure water by driving the water jet room. In the present invention, since the pump pressure is always kept constant by the regulator and the opening / closing cam has a top portion having the same radius of 90 ° or more from the center of rotation, the injection time of the high-pressure water supplied at a constant pressure is lengthened. Can prevent peak pressure from occurring at the beginning of high-pressure water injection, and can perform high-pressure water injection at a constant pressure for a required time. The weft insertion can be performed by changing the water pressure and the injection time according to the yarn type and the weaving width, and the weft insertion can be always performed in a stable state without yarn breakage.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention
Is a water jet that performs weft insertion by jetting high-pressure water
In the room, the height is driven independently of the driving of the loom.
Pressurized water supply pump and regulation to keep pump pressure constant
And a shaft that operates in synchronization with the rotation of the loom.
With a top of the same radius at least 90 ° from the center of rotation
Drives following the opening / closing cam section and the cam surface of the opening / closing cam section,
An operating lever that controls an on-off valve that switches the supply of high-pressure water
In the water jet loom characterized by having
A weft insertion control device.
Keep the pump pressure constant at all times and rotate the open / close cam.
A configuration having a top with the same radius of 90 ° or more from the center of rotation;
Therefore, the injection time of high-pressure water supplied at a constant pressure
Because it can be lengthened, it occurs early in the injection of high-pressure water
Prevents peak pressure and sprays high-pressure water at constant pressure for required time
Injection can also be performed, and the pump by regulator
By adjusting the pressure and changing the top shape of the cam, the thread
Possible to insert weft by water pressure and injection time according to seed and weaving width
Weft insertion in a stable state without thread breakage
Has an action that can be performed. Invention according to claim 2
Is a water jet that performs weft insertion by jetting high-pressure water
In the room, the height is driven independently of the driving of the loom.
Pressurized water supply pump and solenoid valve for switching high pressure water supply
And a controller that controls the electromagnetic valve and the rotation of the loom
And rotates the loom angle information to the controller.
Characterized by having an encoder for communicating
2. A weft insertion control device in an jet room.
Has the same function as the invention described in (1), and has
The above function is achieved by simple means using a magnetic valve.
It becomes possible. Hereinafter, embodiments of the present invention.
This will be described with reference to the drawings. (Embodiment 1) FIG. 1A shows Embodiment 1 of the present invention.
1 is a schematic diagram showing a weft insertion control device in FIG. Figure smell
1 is a high-pressure water supply pump that supplies high-pressure water, 1a is a pump
A regulator that keeps pump 1 at a constant pressure and a pump 2
Valve for switching high-pressure water supplied from the tank, 3 is a lever
An operating lever pivotally supported at the fulcrum 3a to switch the open / close valve;
3b is a cam follower attached to the end of the operating lever 3.
-4 is fixed to a rotating shaft that rotates in synchronization with the main shaft of the loom.
And the top of the same radius (θ) of 90 ° or more from the center of rotation
Opening / closing cam (θ is the water injection section), 5 is the main shaft of the loom
The rotating shaft that rotates in synchronization with
Valve, 8 for controller, 9 and 10 for multi-color yarn main
Nozzle, Y₁, Y_TwoMeans weft insertion from main nozzles 9 and 10
It is the weft to be done. Next, weft insertion in the present embodiment
The operation of the control device will be described. Weft Y₁, Y_TwoIs
Supplied from a yarn feeder not shown, the weft insertion length is measured
It is stored in the weft storage device. During weft insertion, storage device
From the high-pressure water supply pump 1
Is injected from nozzles 9 and 10 together with high-pressure water
It is done. High pressure water supply pump 1 is controlled by regulator 1a.
Is always maintained at a constant pressure.
The occurrence of peak pressure in the air is prevented. Furthermore, high pressure water
The supply is made at the same radius of 90 ° or more from the center of rotation of the cam.
Is opened via the operating lever 3 by the opening / closing cam 4 having a portion.
Since the control is performed by controlling the valve closing 2, the conventional device is used.
The injection time of the high-pressure water can be made longer than in the case of. Next
The timing of the weft insertion operation by the device of the present invention
A description will be given based on FIG. Figure 2 shows the timing of weft insertion
FIG. In the figure, the solid line indicates the method of the present invention.
, And the dotted line is a conventional waveform. injection
Start rotation angle θ₁At the start of high-pressure water injection
You. In the present invention, the pump pressure is applied to the regulator 1a.
The pressure of high pressure water during injection
The force is kept almost constant and θ_TwoInjection ends at
You. In the present invention, the pressure according to the conventional method shown in FIG.
Compared to the waveform, peak pressure does not occur in the early stage of injection, and
In addition, the injection time can be extended by t compared to the conventional method.
And weft insertion can be performed at a stable speed. this
As described above, according to the present invention, the pump pressure is controlled by the regulator 1a.
Always keep constant and open / close cam 4 at 90 ° from center of rotation
Since the above configuration has the tops of the same radius,
The injection time of high pressure water supplied at constant pressure can be extended.
Pressure does not occur in the early stage of injection
High-pressure water injection for the required time
Adjust the pump pressure by the taper 1a to change the top shape of the cam 4.
The water pressure and injection time according to the yarn type and weaving width.
Allows for weft insertion at intervals, no thread breakage,
Weft insertion can be performed in a fixed state. This implementation
In the embodiment, the main nozzle has two nozzles for the multicolor yarn.
The nozzles 9 and 10 are provided, and a switching electromagnetic valve is also provided.
Two valves 6 and 7 are provided for weft insertion of multicolor yarn
Is possible. (Embodiment 2) FIGS. 1B and 1C show an embodiment of the present invention.
It is a schematic diagram showing a weft insertion control device in mode 2. Figure
, 11 and 12 are electromagnetic valves, 13 is an electromagnetic valve
The controller 14 is a rotary encoder. Next
Next, the operation of the weft insertion control device according to the present embodiment will be described.
Will be explained. The electromagnetic valve controller 13 has an embodiment
Rotation angle θ at the start of injection as in state 1 ₁From the end of injection
Roll angle θ_TwoOpen electromagnetic valves 11 and 12 at intervals up to
And pressurized to a constant pressure from the main nozzles 9 and 10.
Weft insertion is performed by injecting high-pressure water. Thus, the rotation angle
θ₁From the rotation angle θ_TwoUntil the weft is pressed to a constant pressure
Weft inserted by high pressure water, θ_TwoFrom θ_ThreeUntil the high pressure water
Pressure is reduced. In addition, FIG. 1 (b)
Replacement is performed by the electromagnetic valve 11 and the nozzles 9 and 10 are
It has a configuration in which color yarn switching electromagnetic valves 6 and 7 are provided.
FIG. 1 (c) shows a multi-color thread switching electromagnetic valve with high-pressure water.
Electromagnetic valves 11 and 12 having a switching function enable
It is configured to perform switching and switching of high-pressure water.

According to the present invention, the pump pressure is always kept constant by the regulator, and the opening / closing cam is set at 90 ° from the rotation center.
With the above-described configuration having the top portions having the same radius, it is possible to lengthen the injection time of the high-pressure water that is always supplied at a constant pressure, thereby preventing the occurrence of the peak pressure occurring at the initial stage of the injection of the high-pressure water. High-pressure water can be injected for the required time, and the pump pressure is adjusted by the regulator, and the top shape of the cam is changed to enable weft insertion according to the water pressure and injection time according to the thread type and weaving width. Thus, weft insertion can be always performed in a stable state without causing yarn breakage. Further, by using an electromagnetic valve instead of the valve and using a controller instead of the opening / closing cam, the same effects as those of the above-described device can be obtained.

[Brief description of the drawings]

FIG. 1A is a schematic diagram illustrating a weft insertion control device according to a first embodiment of the present invention. (B) and (c) are schematic diagrams showing a weft insertion control device according to Embodiment 2 of the present invention.

FIG. 2 is a waveform chart showing the timing of a weft insertion operation.

FIG. 3 is a sectional view showing a drive cam of a conventional weft insertion control device.

[Explanation of symbols]

1 high-pressure water supply pump 1a regulator 2 valve 3 operation lever 3a fulcrum 3b solenoid valve 8 controller cam follower 4 cams 5 rotary shaft 6 switching 9,10 main nozzles 11, 12 solenoid valves Y _1, Y ₂ weft 13 Controller 14 Encoder

Claims (2)

[Claims] 1. A high-pressure water supply pump driven independently of driving of a loom, a regulator for keeping pump pressure constant at all times, and a rotation of the loom in a water jet loom in which weft insertion is performed by injection of high-pressure water. An open / close cam fixed to a shaft that operates in synchronism with the center and having an apex of the same radius of 90 ° or more from the center of rotation, and an open / close valve that switches the supply of high-pressure water by driving following the cam surface of the open / close cam A weft insertion control device for a water jet loom, comprising: 2. In a water jet loom in which weft insertion is performed by injection of high-pressure water, a high-pressure water supply pump driven independently of driving of a loom, an electromagnetic valve for switching high-pressure water supply, and an electromagnetic valve are controlled. A controller to
A weft insertion control device for a water jet loom, comprising: an encoder that rotates in synchronization with rotation of a loom and transmits angle information of the loom to a controller.