JP2838219B2 - Air supply device for air jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an air supply device configured to supply air from an air supply source to an air injection loom.

<Prior Art> In an air injection loom, when weft is inserted by injecting compressed air from a weft insertion nozzle (main nozzle and auxiliary nozzle) for a predetermined injection time, the weft insertion state, for example, the weft insertion By detecting the arrival timing or the weft insertion speed to the weft insertion side and controlling the air pressure supplied to the weft insertion nozzle so that this will be a constant target value, it is always optimal regardless of changes in yarn quality variation etc. (See Japanese Patent Application Laid-Open No. 59-71459, etc.).

By the way, as shown in Japanese Utility Model Publication No. 63-24145, etc., an air supply device that supplies compressed air from a single compressed air supply source to each of a plurality of air injection looms provided in a factory or the like is disclosed. Conventionally, the air pressure used in each air-jet loom, for example, the control pressure of the air supplied to the weft insertion nozzle described above, and other factors, such as pressure reduction due to air pipe resistance, supply pressure, etc. The air pressure, that is, the base pressure is optimally set, and based on this set pressure, the drive of the compressor as the air supply source is turned on / off so that the base pressure does not fall below the set pressure.

<Problems to be Solved by the Invention> However, the air pressure used in each air injection loom is automatically adjusted based on the weft insertion state due to, for example, maintenance or a change in the thread type, and as a result, the base pressure is reduced. On the other hand, the base pressure may be significantly smaller, in other words, the base pressure may be higher than necessary.

Also, in the case where the air pressure supplied to the weft insertion nozzle is artificially adjusted depending on the yarn type, the air pressure may be adjusted every time the machine is changed due to the recent tendency of production of many kinds and small quantities. In some cases, the base pressure may become higher than necessary.

If the base pressure becomes unnecessarily high, the driving power of the compressor is wastefully consumed, which is not preferable from the viewpoint of energy saving.

In order to solve such inconveniences, it is conceivable to frequently check the air pressure used in the air jet loom and adjust the base pressure.However, this method requires complicated manual adjustment work and is troublesome. There is a problem that it takes.

Therefore, the present invention has been made in view of the above conventional problems,
It is an object of the present invention to solve the above-mentioned conventional problems, to save power, and to eliminate human labor by a configuration in which a base pressure is automatically adjusted based on an air pressure used in an air jet loom. .

<Means for Solving the Problems> For this reason, the air supply device for an air injection loom of the present invention is an air supply device configured to supply air from an air supply source to a plurality of air injection looms, A configuration provided with a control device that controls a set base pressure of the air supply source so as to variably control an air pressure supplied from the air supply source based on a maximum value of an air pressure used in the plurality of air injection looms. I do.

<Operation> In such a configuration, the air pressure used in the air jet loom is automatically or artificially adjusted based on the weft insertion state due to, for example, maintenance or a change in the thread type.
By variably controlling the air pressure supplied from the air supply source based on the used air pressure, the base pressure supplied from the air supply source does not become unnecessarily high.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

In the figure, for example, a plurality of air injection looms 1 are provided in a factory or the like.
An air supply device is provided which supplies compressed air from a single compressed air supply source to each weft insertion nozzle or the like.

That is, the compressor 2 as the compressed air supply source is connected to the tank 4 via the pipe 3, and a plurality of branch pipes 6 are connected to the main pipe 5 connected to the tank 4.
An air supply path 7 to a weft insertion nozzle provided in each air jet loom 1 is connected to these branch pipes 6 in a mutually parallel relationship.

In each air jet loom 1, for example, a command value of the air pressure to be supplied to the weft insertion nozzle is set so that the arrival timing of the weft to the opposite weft insertion side is constant, and based on this, the air supply A regulator (pressure regulator) 8 interposed in the passage 7 is controlled to control the air pressure.

Here, a control device is provided for controlling the base pressure so as to variably control the air pressure supplied from the compressor 2 in accordance with the maximum value of the air pressure used in the plurality of air-jet looms 1.

This control device is configured as follows in the present embodiment.

That is, the above-described regulator 8 uses the control pressure value of the supply air to the weft insertion nozzle, which is the highest pressure among the pressures used in the air jet loom 1, for example, as an electric signal, and determines the highest pressure judgment unit of the controller 9. It is configured to enter 10.

The maximum pressure determination unit 10 compares and determines the input control pressure values and outputs the highest pressure value among the control pressure values to the theoretical base pressure calculation unit 11 at the subsequent stage.

The theoretical base pressure calculation unit 11 calculates the theoretical base pressure by correcting the pressure value in consideration of the pressure drop due to the pipe resistance and the like.

Next, the calculated theoretical base pressure value is input to the first comparator 12 as the set base pressure, and is also input to the second comparator 12 via the correction unit 13.
Is input to the comparator 14. The correction unit 13 adds the α pressure value as a safety factor in consideration of the marginal pressure of the base pressure to the theoretical base pressure value, and uses this value as a set base pressure for the second comparator 14.
To enter.

The first comparator 12 and the second comparator 14 receive the pressure values output from the pressure sensor 15 for detecting the air pressure in the tank 4, respectively.

The first comparator 12 compares the pressure value in the tank 4 with the theoretical base pressure value, and turns on the drive control circuit 16 of the compressor 2 when the pressure value in the tank 4 falls below the theoretical base pressure value. Output a voltage signal.

Further, the second comparator 14 compares the pressure value in the tank 4 with a value obtained by adding the α pressure value to the theoretical base pressure value, and determines that the pressure value in the tank 4 is equal to the theoretical base pressure value. When the value exceeds the value obtained by adding the value, a voltage signal for turning off the drive control circuit 16 of the compressor 2 is output.

In this way, by comparing the theoretical base pressure value with the pressure value in the tank 4 and turning on / off the drive control circuit 16 of the compressor 2, the base supplied to each air-injection loom 1 by the compressor 2 is obtained. The pressure is controlled to an appropriate value based on the theoretical base pressure. In this case, two comparators 12 and 14 are provided, and a reference value to be input to the comparators 12 and 14 is a theoretical base pressure value and a value obtained by adding the α pressure value to the theoretical base pressure value. Since the on / off control of the drive control circuit 16 is performed, the lower limit of the base pressure supplied to each air-jet loom 1 is set by the output from the comparator 12 side, Sets the upper limit of the base pressure. Therefore, compared to the case where the compressor 2 is turned on / off only by the output of the single comparator, the compressor 2 is not turned on / off frequently, and the smooth drive control of the compressor 2 is executed. .

According to this configuration, the air pressure supplied from the compressor 2, that is, the base pressure, is variably controlled in accordance with the air pressure used in each air injection loom 1, so that the air pressure used in each air injection loom 1 However, when the base pressure is unnecessarily higher than the working pressure in the air-jet loom 1 when it is automatically or artificially adjusted based on a weft insertion state due to, for example, maintenance or a change in the thread type. There is no.

As a result, the driving power of the compressor 2 is not unnecessarily consumed, which is preferable from the viewpoint of energy saving.

In addition, since the base pressure is automatically adjusted, there is an advantage that complicated manual adjustment work is not required and time and labor are not required.

Note that the above embodiments do not show the structural limitations of the present invention, and the present invention provides air supplied from an air supply source such as the compressor 2 in accordance with the maximum value of the air pressure used in a plurality of air injection looms. Any configuration may be used as long as the set base pressure of the air supply source is controlled so as to variably control the pressure.

<Effect of the Invention> As described above, according to the air supply device for an air injection loom according to the present invention, the air is supplied from the air supply source based on the maximum value of the air pressure used in the plurality of air injection looms. Since the set base pressure of the air supply source is controlled so as to variably control the air pressure, even when the air pressure used in the air jet loom is adjusted, the air pressure supplied from the air supply source is reduced. The working pressure of the air jet loom does not become unnecessarily high, and the usefulness of energy saving of the air supply source and elimination of human work can be enhanced.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of an air supply device for an air jet loom according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Air injection loom, 2 ... Compressor 8 ... Regulator 9 ... Controller 10 ... Maximum pressure judgment part, 11 ... Theoretical base pressure calculation part 12 ... First comparator, 14 ... 2 comparators 13: correction unit, 15: pressure sensor 16: drive control circuit

Claims (1)

(57) [Claims] An air supply device adapted to supply air from an air supply source (2) to a plurality of air-jet looms (1), wherein the air pressure of the plurality of air-jet looms (1) is reduced. Control devices (8), (9), and (8) for controlling the set base pressure of the air supply source (2) to variably control the air pressure supplied from the air supply source (2) based on the maximum value.
(15) An air supply device for an air-jet loom, which is provided with (16).