JP2000073260A - Operation of solenoid valve in loom and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To equalize action of a solenoid valve in restart of operation after stopping long-term loom operation to stationary action during weaving. SOLUTION: A pressure controller 32 changes over pressure control state of an electric type pressure control valve 31 from a set pressure state in weaving to a base bottom pressure state based on input of weaving stop signal from a loom control computer C to reduce pressure in a pressure air feed tank 26 to level of atmospheric pressure. When a start switch 10 is turned on, the loom control computer C outputs preparing magnetization and demagnetization signal to a magnetization and demagnetization controller 35. The magnetization and demagnetization controller 35 demagnetizes electromagnetic opening and closing valves 20-25 once in loom operation stop state based on input of preparing magnetization and demagnetization signal. Then, the pressure controller 32 returns pressure in the pressure air feed tank 26 to set pressure and the magnetization and demagnetization controller 35 starts magnetization and demagnetization for weft inserting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for operating a solenoid valve in a loom using a solenoid valve.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open No. 9-59851, an electromagnetic on-off valve is used in a jet loom in which weft insertion is performed by the injection action of a weft insertion main nozzle and a weft insertion auxiliary nozzle. The electromagnetic on-off valve is used for switching between supplying and stopping air supply to the weft insertion main nozzle and the weft insertion auxiliary nozzle. The quick operation of the solenoid on-off valve is important for obtaining proper injection timing of air in the weft insertion main nozzle and the weft insertion auxiliary nozzle.

[0003] However, as disclosed in Japanese Patent Application Laid-Open No. 9-59851, when the operation stop period of the loom becomes longer,
The initial movement of the solenoid on-off valve immediately after the restart of the operation of the loom becomes dull. Such slow initial movement of the electromagnetic on-off valve hinders obtaining proper injection timing of air from the weft insertion main nozzle and the weft insertion auxiliary nozzle immediately after the restart of the operation of the loom. If the air injection by the weft insertion main nozzle and the weft insertion auxiliary nozzle is not performed at an appropriate timing, a weft insertion error is likely to occur. Therefore, Japanese Patent Application Laid-Open No. 9-59
In the device disclosed in Japanese Patent No. 851, when the operation of the loom is restarted after the operation stop period is lengthened, an over-excitation voltage higher than the over-excitation voltage steadily applied to the solenoid on-off valve during weaving is applied to the predetermined loom. The over-excitation voltage is applied to the electromagnetic on-off valve only during the number of rotations, or the over-excitation voltage is applied to the electromagnetic on-off valve during weaving for a time longer than the application time of the over-excitation voltage steadily applied to the predetermined number of rotations of the loom. A supplementary countermeasure for applying the over-excitation voltage such that the voltage is applied only during the period is taken.
The dull initial movement of the solenoid on-off valve immediately after the restart of the operation of the loom is eliminated by the above-described countermeasures for applying the over-excitation voltage.

[0004]

The operation state of the solenoid on-off valve due to the above-described countermeasure for applying the auxiliary over-excitation voltage during the weaving is different from the operation state of the electromagnetic on-off valve by the steady over-excitation voltage application timing. Is different. The application timing of the steady overexcitation voltage is set so as to obtain the proper injection timing of the air in the weft insertion main nozzle and the weft insertion auxiliary nozzle. Therefore, the air injection timing of the weft insertion main nozzle and the weft insertion auxiliary nozzle obtained by the application of the auxiliary over-excitation voltage during weaving is different from the appropriate injection timing. Such a deviation of the air injection timing during weaving may cause a weft insertion error.

Further, in a configuration in which an overexcitation voltage higher than an overexcitation voltage steadily applied to the electromagnetic on-off valve during weaving is applied, a power supply for generating an overexcitation voltage steadily applied is provided. A separate power supply is required. Such a configuration requiring a separate power supply leads to an increase in the cost of the loom.

An object of the present invention is to make it possible to make the operation of the solenoid valve at the time of restarting the operation after the operation of the loom has been stopped for a long period of time equal to the steady operation during weaving.

[0007]

For this purpose, in the invention of claim 1, a preparatory operation for exciting and deenergizing the solenoid valve at least once is performed before the operation is resumed after the operation is continuously stopped for a predetermined period or more. I made it.

The preparatory operation for the solenoid valve eliminates the dull initial movement of the solenoid valve in this operation. The preparation operation is performed before the main operation of the solenoid valve, and the preparation operation is not performed as a part of the main operation. Therefore, the supply timing of the fluid supplied via the solenoid valve during weaving does not differ from the steady fluid supply timing during weaving.

According to the invention of claim 2, in claim 1,
The preparatory operation was demagnetization with no fluid flowing. Objects affected by the supply of fluid supplied via the solenoid valve are not affected during the preparatory operation.

According to a third aspect of the present invention, in any one of the first and second aspects, the solenoid valve that is operated every rotation of the loom is preliminarily operated at the operation timing during weaving before the operation of the loom starts. I made it.

[0011] Control of the steady operation timing during weaving can be used for the preparation operation. According to a fourth aspect of the present invention, there is provided an electromagnetic valve operating device comprising: a preparatory operation command signal output unit that outputs a preparatory operation command signal for preparatory operation of the electromagnetic valve; and an operation control unit that excites the electromagnetic valve. Make up,
The operation control means performs a preparatory operation of demagnetizing the solenoid valve at least once in response to the output of the preparatory operation command signal from the preparatory operation command signal output means.

When the preparatory operation command signal output means outputs the preparatory operation command signal, the operation control means performs the preparatory operation of the solenoid valve and then fully operates the solenoid valve. According to a fifth aspect of the present invention, in the fourth aspect, an electromagnetic valve actuating device comprising an automatic pressure adjusting means for automatically adjusting the pressure of the fluid sent to the electromagnetic valve, wherein the automatic pressure adjusting means is provided with the preparatory operation command The pressure of the fluid is reduced based on the output of the preparation operation command signal from the signal output means, and the operation control means performs the preparation operation after the pressure of the fluid is reduced by the automatic pressure adjusting means.

If the pressure of the fluid is reduced,
Inconvenience caused by the supply of the fluid accompanying the preparatory operation of the solenoid valve is avoided. According to a sixth aspect of the present invention, in the fourth aspect, a notifying unit for notifying the execution of the preparatory operation of the solenoid valve based on the output of the preparatory operation command signal of the preparatory operation command signal output unit, and the preparatory operation of the operation control unit An electromagnetic valve actuating device comprising a manually operated preparatory operation instructing means for instructing control is constituted.

The preparatory operation of the solenoid valve is notified in advance by a notifying means. The operator operates the manually operated preparatory operation instructing means according to this notification to preparatoryly operate the solenoid valve.

According to a seventh aspect of the present invention, in any one of the fourth to sixth aspects, the loom is a jet loom in which the weft is inserted by the jetting action of the weft insertion main nozzle and the weft insertion auxiliary nozzle. The electromagnetic valve is an electromagnetic on-off valve that switches between supplying and stopping air supply to the weft insertion main nozzle and the weft insertion auxiliary nozzle.

The present invention is suitable for application to a jet loom.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in a jet loom will be described below with reference to FIGS.

M shown in FIG. 1 is a loom drive motor, which is controlled by a loom control computer C. The loom control computer C is turned on by the start switch 10
The operation of the loom drive motor M is commanded based on the operation. 1
Reference numeral 1 denotes a winding type weft length storage device. The winding of the weft onto the yarn winding surface 111 of the weft measuring and storing device 11 and the unwinding of the weft from the yarn winding surface 111 are performed by the electromagnetic solenoid 12.
Is controlled by the movement of the locking pin 121. Excitation and demagnetization of the electromagnetic solenoid 12 are performed under command control of the loom control computer C via the drive circuit 13. The loom control computer C controls the excitation and demagnetization of the electromagnetic solenoid 12 based on the weft unwinding detection information from the weft unwinding detector 14.

The weft yarn Y pulled out and ejected from the yarn winding surface 111 by the ejection action of the weft insertion main nozzle 15 is
It is inherited by the relay injection of the plurality of auxiliary nozzles 16 for weft insertion. When the weft insertion is performed satisfactorily, the presence or absence of the weft yarn Y reaching the weft insertion end is detected by a photoelectric sensor type weft insertion error detector 17 in a predetermined loom rotation angle range.
If the weft has not arrived, the weft insertion error detector 17 outputs an operation stop signal to the loom control computer C. The loom control computer C stops the operation of the loom based on the input of the operation stop signal.

At the weft insertion end, a stretch nozzle 18 and a gripping pipe 19 are opposed to each other. The facing gap between the stretch nozzle 18 and the gripping pipe 19 intersects the weft insertion path of the weft Y. When the weft Y is inserted normally, the leading end of the weft Y is blown into the gripping pipe 19 by the jetting action of the stretch nozzle 18. The leading end of the weft Y is gripped by the air jet force in the gripping pipe 19, and an appropriate tension is applied to the weft Y.

The weft insertion pressure air injection at the weft insertion main nozzle 15 is controlled by the demagnetization of the solenoid on-off valve 20. The weft insertion pressure air injection in the weft insertion auxiliary nozzle 16 is controlled by the demagnetization of the electromagnetic on-off valves 21, 22, 23, 24. The weft grasping pressure air injection in the stretch nozzle 18 is controlled by the demagnetization of the electromagnetic on-off valve 25. The solenoid on-off valve 20 is connected to a pressure air supply tank 26, and the solenoid on-off valves 21 to 24 are connected to a pressure air supply tank 27. The solenoid on-off valve 25 is connected to a pressure air supply tank 28. The pressurized air supply tanks 26 and 27 are connected to a source pressure tank 34 via electric pressure regulating valves 31 and 33. Electric pressure regulating valve 31,
33 is controlled by the pressure control device 32.

Excitation and demagnetization of each of the electromagnetic on-off valves 20 to 25 are controlled by an excitation and demagnetization control device 35 via a drive circuit 29.
During weaving, the excitation / demagnetization control device 35 receives the excitation / demagnetization command from the loom control computer C and the rotary encoder 3.
0 based on the loom rotation angle detection signal from 0
Excitation and demagnetization control for weft insertion is performed to control 0 to 25 excitation and demagnetization. The data of the excitation / demagnetization command is stored in the excitation / demagnetization control device 35.
The excitation / demagnetization control device 35 executes a weft insertion control command based on these data and the weft insertion control program input and set in the program memory.

Pressure sensors 36 and 37 are connected to the pressure air supply tanks 26 and 27, respectively.
7 is input to the pressure control device 32. The pressure control device 32 feedback-controls the electric pressure regulating valves 31 and 33 based on the pressure information from the pressure detectors 36 and 37. During weaving, the pressure control device 32
Is a weft insertion error detector 17 at a predetermined time.
Electric pressure regulating valves 31 and 3 to reach the installation position
The weft insertion pressure control of controlling the pressure adjustment state of No. 3 is performed. That is, the pressure air supply tank 2 during weaving
The pressure in the insides 6 and 27 is controlled so that the leading end of the weft Y reaches the installation position of the weft insertion error detector 17 at a predetermined time.

3 to 5 show the loom control computer C,
5 is a flowchart showing a solenoid valve operation control program by a pressure control device 32 and an excitation / demagnetization control device 35. Hereinafter, the solenoid valve operation control will be described with reference to the flowcharts of FIGS.

When the weft insertion error detector 17 detects that the weft has not arrived and outputs an operation stop signal to the loom control computer C, the loom control computer C outputs a weaving stop signal to the pressure control device 32 and the excitation / demagnetization control device 35. At the same time, the operation of the loom drive motor M and the demagnetization of the electromagnetic solenoid 12 are stopped. The pressure control device 32 switches the pressure adjustment state of the electric pressure regulating valve 31 from the set pressure state at the time of weaving to the base pressure state based on the input of the weaving stop signal. The set pressure state is a pressure adjustment state in which the pressure in the pressure air supply tank 26 is set at the time of weaving, and the base pressure state is a pressure adjustment state in which the pressure in the pressure air supply tank 26 is about atmospheric pressure. That is. The excitation / demagnetization control device 35
The excitation / demagnetization control of the electromagnetic on-off valves 20 to 25 is stopped based on the input of the weaving stop signal.

The pressure controller 32 grasps the pressure in the pressure air supply tank 26 based on the pressure detection information from the pressure detector 36. When the pressure in the pressurized air supply tank 26 is reduced to about the atmospheric pressure, the pressure control device 32 outputs a pressure reduction completion signal to the excitation / demagnetization control device 35. The excitation / demagnetization control device 35 waits for the input of the preparation excitation / demagnetization signal based on the input of the pressure reduction completion signal.

When the start switch 10 is turned on after performing the weft insertion error processing for removing the weft insertion error from the weave of the woven fabric, the loom control computer C sends the preparatory excitation demagnetization signal to the pressure control device 32 and the excitation demagnetization. Output to the control device 35. The exciter / demagnetizer controller 35 controls the electromagnetic on-off valves 20 to 25 in the loom operation stop state based on the input of the preparatory excitation / demagnetization signal
Is demagnetized once. Since the pressure in the pressurized air supply tanks 27 and 28 is the set pressure during weaving, the auxiliary nozzle 16 for weft insertion and the stretch nozzle 18 are de-energized by the electromagnetic on-off valves 21 to 25 during the stoppage of the operation of the loom. Perform air injection. However, since the pressure in the pressurized air supply tank 26 is about atmospheric pressure, the weft insertion main nozzle 15
Does not perform the air injection by the preparatory excitation and demagnetization of the solenoid on-off valve 20 during the stoppage of the operation of the loom. Therefore, the weft passing through the weft insertion main nozzle 15 is not inserted.

The excitation / demagnetization control device 35 outputs a preparatory excitation / demagnetization completion signal to the loom control computer C and the pressure control device 32 after the preparatory excitation / demagnetization. The pressure control device 32 switches the pressure adjustment state of the electric pressure adjustment valve 31 to the set pressure state at the time of weaving based on the input of the preparatory excitation / demagnetization completion signal. When the pressure in the pressurized air supply tank 26 returns to the set pressure, the pressure control device 32 outputs a pressure return completion signal to the loom control computer C. The loom control computer C sends a weaving start signal to the pressure control device 3 based on the input of the pressure return completion signal.
2 and the excitation / demagnetization control device 35. Pressure control device 3
2 starts the weft insertion pressure control at the time of weaving based on the input of the weaving start signal, and the excitation / demagnetization control device 35 starts the weft insertion excitation / demagnetization control based on the input of the weaving start signal.

In the first embodiment, the following effects can be obtained. (1-1) The loom control computer C constituting the preparatory operation command signal output means transmits the preparatory excitation demagnetization signal serving as the preparatory operation command signal in accordance with the ON operation of the start switch 10 to the excitation demagnetization control device 35 as the operation control means. Output to The excitation and demagnetization control device 35, which is an operation control means, controls the electromagnetic on-off valves 20 to 25 when the loom operation is stopped before the loom operation is started.
Is demagnetized once. Such preparatory demagnetization before entering the main operation of demagnetizing the electromagnetic on-off valves 20 to 25 during weaving is as follows.
Eliminates the dullness of the initial movement of the solenoid on-off valves 20 to 25 due to the long-term operation stop of the loom. Therefore, the solenoid on-off valves 20 to
25 is the same as the operability of the stationary solenoid on-off valves 20 to 25 during weaving.
~ 25 smooth opening and closing operations are ensured from the first movement. (1-2) The preparatory operation of the electromagnetic on / off valves 20 to 25 is performed before the main operation, and the preparatory operation of the electromagnetic on / off valves 20 to 25 is not performed as a part of the main operation. That is, the air injection timing of the weft insertion main nozzle 15 and the weft insertion auxiliary nozzle 16 immediately after the start of the loom operation does not differ from the desired steady air injection timing during weaving. Therefore, the weft insertion main nozzle 15, the weft insertion auxiliary nozzle 16, and the stretch nozzle 18 always jet at a predetermined timing, and stable weft insertion is guaranteed. (1-3) The weft Y is wound on the yarn winding surface 11 by the locking pin 121.
If the weft insertion main nozzle 15 injects air in a state in which the drawing from the main nozzle 1 is prevented from being pulled out, the weft yarn Y is liable to break on the upstream side of the weft insertion main nozzle 15. Such a yarn break is a weft insertion error.

In this embodiment, the solenoid on-off valves 20 to 25
During the preparatory operation, the pressure control device 32, which is an automatic pressure adjusting means, performs control to reduce the pressure of the pressurized air supply tank 26 to atmospheric pressure. Will not be injected.
Therefore, the weft yarn Y inserted by the supply of the pressure air supplied through the electromagnetic on-off valve 20 is not affected by the pressure air during the preparatory operation, and a situation in which the yarn breaks does not occur. (1-4) The electromagnetic on-off valves 20 to 25 are demagnetized once at a predetermined timing every rotation of the loom. Even during the preparatory operation, the electromagnetic on / off valves 20 to 25 are excited and demagnetized at a steady excitation and demagnetization timing during weaving. The configuration in which the control of the steady excitation / demagnetization timing during the weaving is used for the preparation operation contributes to the simplification of the excitation / demagnetization control of the electromagnetic on-off valves 20 to 25. (1-5) The number of solenoid valves used in the jet loom is larger than that of other types of looms. The present invention is suitable for application to a jet loom using many solenoid valves.

Next, a second embodiment shown in FIGS. 6 to 8 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, the preparatory excitation / demagnetization command switch 38 and the notification device 39 are connected to the loom control computer C by signal. The loom control computer C and the excitation / demagnetization control device 40 execute the excitation / demagnetization control program shown in the flowcharts of FIGS.

When the operation stop signal is output, the loom control computer C and the demagnetization controller 40 operate the loom drive motor M and demagnetize the solenoid on-off valves 20 to 25 in the same manner as in the first embodiment. Stop control. When the start switch 10 is turned on after the operation of the loom is stopped, the loom control computer C instructs the notifying device 39 to remove the weft Y from the weft insertion main nozzle 15 and to notify the start of the preparatory excitation demagnetization. The notifying device 39, which is a notifying unit, performs the notification of the removal of the weft Y from the weft insertion main nozzle 15 and the start of the preparatory excitation demagnetization based on the notification command. The worker
Based on this notification, the weft yarn Y is removed from the weft insertion main nozzle 15 and the preparation excitation / demagnetization command switch 38 is turned off.
N operations will be performed. When the preparatory excitation / demagnetization command switch 38 serving as a manually operated preparatory operation command means is turned ON,
The loom control computer C outputs a preparation excitation / demagnetization signal to the excitation / demagnetization control device 40. The exciter / demagnetizer controller 40 controls the electromagnetic on-off valve 2 before starting the operation of the loom based on the input of the preparatory exciter signal.
Energize and demagnetize 0 to 25 once. Solenoid on-off valves 20 to 25 are 1
After being de-energized, the de-energization controller 40 outputs a preparatory de-energization completion signal to the loom control computer C. The loom control computer C outputs a weaving start signal to the excitation / demagnetization control device 40 based on the input of the preparatory excitation / demagnetization completion signal,
The loom drive motor M is operated. The excitation / demagnetization control device 40 starts the weft insertion / excitation demagnetization control of the electromagnetic on-off valves 20 to 25 based on the input of the weaving start signal.

In this embodiment, when the preparatory excitation / demagnetization command switch 38 is turned on, the electromagnetic on / off valves 20 to
25 preparation operations are performed. That is, the solenoid on-off valves 20 to 2
5, the weft insertion main nozzle 15, the weft insertion auxiliary nozzle 16, and the stretch nozzle 18 perform air injection. Before that, the weft Y is removed from the weft insertion main nozzle 15. Therefore, the solenoid on-off valves 20 to 2
5 during the preparation operation, the weft yarn Y is
, And the weft Y does not break.

Next, a third embodiment shown in FIGS. 9 and 10 will be described. The same components as those in the second embodiment are denoted by the same reference numerals. In this embodiment, Japanese Patent Laid-Open No.
Weft processing device 41 as disclosed in Japanese Patent No. 56343
Is used. The weft processing device 41 removes a weft that has been erroneously inserted from the front of the woven fabric. The weft processing device 41 is controlled by the loom control computer C.
The loom control computer C executes the excitation / demagnetization control program shown in the flowchart of FIG.
Executes the excitation / demagnetization control program shown in the flowchart of FIG.

When the operation stop signal is output, the loom control computer C and the demagnetization control device 40 operate the loom drive motor M and demagnetize the solenoid on-off valves 20 to 25 as in the first embodiment. Stop control. When the start switch 10 is turned on after the operation of the loom is stopped, the loom control computer C outputs a preparatory excitation / demagnetization signal to the excitation / demagnetization control device 40 and excites the electromagnetic solenoid 12. The winding weft on the yarn winding surface 111 is released from the locking action of the locking pin 121 by the excitation of the electromagnetic solenoid 12. Next, the loom control computer C starts the operation of the weft processing device 41, and the electromagnetic on-off valve 411 constituting the weft processing device 41 is excited. When the electromagnetic on-off valve 411 is excited, the weft insertion preventing nozzle 412 constituting the weft processing device 41 jets.

The exciter / demagnetizer controller 40 controls the electromagnetic on-off valves 20 to 25 before starting the operation of the loom based on the input of the preparatory excitation / demagnetization signal.
Is demagnetized once. The preparatory excitation and demagnetization of the electromagnetic on-off valve 20 causes the weft insertion main nozzle 15 to perform air injection, and the weft is ejected from the weft insertion main nozzle 15. After the solenoid on-off valves 20 to 25 are de-energized once, the de-energization control device 40
Outputs a preparation excitation demagnetization completion signal to the loom control computer C. The loom control computer C demagnetizes the electromagnetic solenoid 12 based on the input of the preparatory excitation / demagnetization completion signal, and the locking pin 121 prevents the weft Y from being pulled out. The weft injected from the weft insertion main nozzle 15 is
12, the weft insertion is prevented, and the weft processing device 4
The weft take-up mechanism 413 that constitutes 1 takes out and removes the weft that has been prevented from being inserted.

Upon completion of the weft take-off and removal by the weft take-up mechanism 413, that is, the completion of the weft processing, the loom control computer C sends the weaving start signal to the excitation / demagnetization control device 40.
And the loom driving motor M is operated. The excitation / demagnetization control device 40 starts the weft insertion excitation / demagnetization control of the electromagnetic on-off valves 20 to 25 based on the input of the weaving start signal.

In this embodiment, the items (1-1), (1-2), (1-4) and (1-) in the first embodiment are described.
The same effect as in item 5) can be obtained. In the present invention, the following embodiments are also possible. (1) In the first and third embodiments, the loom operation stop period is measured, and when the measured period exceeds a predetermined period, the preparatory operation of the electromagnetic on-off valves 20 to 25 is performed. . When the loom operation is stopped for a short period of time that does not require the preparatory operation of the solenoid on-off valves 20 to 25, the solenoid on-off valves 2
Unnecessary preparation operations of 0 to 25 can be prevented from being performed. (2) In the second embodiment, the loom operation stop period is measured, and the measurement result can be reported by the reporting device 39. Whether or not it is necessary to perform the preparatory operation of the electromagnetic on-off valves 20 to 25 can be determined based on the notification of the measurement result during the loom operation stop period. (3) In the third embodiment, the stretch nozzle 1
8 and the electromagnetic on-off valve 25 are used in place of the weft processing device 41. That is, the weft is inserted by the preparatory operation of the electromagnetic on-off valves 20 to 25, and the inserted weft is discarded into the gripping pipe 19 by the injection action of the stretch nozzle 18. (4) Preliminary operation of the solenoid valve shall be demagnetized twice or more. (5) At the time of the preparatory operation, the electromagnetic on / off valves 20 to 25 are energized and demagnetized all at once, instead of being energized and demagnetized at the steady excitation and demagnetization timing during weaving.

[0039]

As described above in detail, according to the present invention, a preparatory operation for exciting and deenergizing the solenoid valve at least once is performed before the operation is resumed after the stoppage for a predetermined period or more. In addition, there is an excellent effect that the operation of the solenoid valve at the time of restarting the operation after the operation of the loom has been stopped for a long period of time can be equivalent to the steady operation during weaving.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a weft insertion device.

FIG. 2 is a flowchart showing a solenoid valve operation control program.

FIG. 3 is a flowchart showing a solenoid valve operation control program.

FIG. 4 is a flowchart showing a solenoid valve operation control program.

FIG. 5 is a control block diagram showing a second embodiment.

FIG. 6 is a flowchart showing a solenoid valve operation control program.

FIG. 7 is a flowchart showing a solenoid valve operation control program.

FIG. 8 is a control block diagram showing a third embodiment.

FIG. 9 is a flowchart showing a solenoid valve operation control program.

[Explanation of symbols]

15 ... weft insertion main nozzle, 16 ... weft insertion auxiliary nozzle, 20 to 25 ... electromagnetic on-off valve, 31, 33 ... electric pressure adjustment valve constituting automatic pressure adjusting means, 32 ... automatic pressure adjusting means Pressure control devices, 35, 40 ... Electromagnetic valve operation control device serving as operation control means, 36 ... Pressure detectors constituting automatic pressure adjusting means, 38 ... Preparatory operation command switch serving as manual operation type preparatory operation command means, 39 ... An informing device serving as an informing means; C: a loom control computer constituting a preparatory operation command signal output means;

Claims (7)

[Claims] 1. A method of operating a solenoid valve in a loom using a solenoid valve, wherein the loom performs a preparatory operation of deenergizing the solenoid valve at least once before stopping operation for a predetermined period or more and restarting operation. . 2. The method according to claim 1, wherein the preparatory operation is demagnetization in a state in which no fluid flows. 3. The solenoid valve operation in a loom according to claim 1, wherein the solenoid valve operated every rotation of the loom is preliminarily operated at an operation timing during weaving before the operation of the loom. Method. 4. A loom using an electromagnetic valve, comprising: a preparatory operation command signal output unit that outputs a preparatory operation command signal for preparatory operation of the electromagnetic valve; and an operation control unit that excites and demagnetizes the electromagnetic valve. An operation device for an electromagnetic valve in a loom, wherein the operation control means performs a preparatory operation of exciting and demagnetizing the electromagnetic valve at least once in response to an output of a preparatory operation command signal from the preparatory operation command signal output means. 5. An automatic pressure adjusting means for automatically adjusting a pressure of a fluid sent to said solenoid valve, said automatic pressure adjusting means being adapted to output said fluid based on an output of a preparatory operation command signal from said preparatory operation command signal output means. 5. The electromagnetic valve operating device according to claim 4, wherein the pressure of the fluid is reduced, and the operation control means performs the preparation operation after the pressure of the fluid is reduced by the automatic pressure adjusting means. 6. A notifying means for notifying the execution of the preparatory operation of the solenoid valve based on the output of the preparatory operation command signal from the preparatory operation command signal output means, and a manual operation type commanding the preparatory operation control of the operation control means. The solenoid valve actuating device in the loom according to claim 4, further comprising a preparatory operation instructing means. 7. The loom is a jet loom for weft insertion by a jetting action of a weft insertion main nozzle and a weft insertion auxiliary nozzle, and the solenoid valve includes the weft insertion main nozzle and the weft insertion auxiliary nozzle. The electromagnetic valve actuation device for a loom according to any one of claims 4 to 6, wherein the electromagnetic valve is a solenoid on-off valve for switching between supply and stop of air supply to the loom.