JP2970074B2 - Pressure control method for jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically controlling an initial pressure in a weaving stage (initial pressure automatic control) of a jet loom.

[0002]

2. Description of the Related Art In a jet loom, after reaching a substantially steady operation state, the arrival time from a main nozzle is detected by a weft arrival timing detection sensor installed on a side opposite to the weft insertion side, and the weft arrival timing is determined based on the time. It is known that the pressure of the main nozzle is controlled so as to reach a target value (for example, Japanese Patent Publication No. 64-3969,
9-71459).

[0003]

However, in this method, the arrival time from the main nozzle to the arrival timing detection sensor is measured, and the pressure of the main nozzle is controlled based on the measurement result. If the weft does not arrive, the arrival timing cannot be measured, and therefore the pressure of the main nozzle cannot be controlled. In particular, in the weaving stage (in the initial stage of the automatic pressure control), if the initial pressure is not properly set, weft insertion errors frequently occur, and it is not possible to sufficiently sample data of the arrival timing of the weft. For this reason, it is necessary for the operator to manually reset the pressure of the weft insertion nozzle, and the pressure cannot be automatically controlled.

[0004] That is, in the weaving stage by changing the machine, if the initial set pressure is not appropriate, the weft does not reach the weft arrival timing detection sensor, and the weft is in short supply of the weft (show topic). Does not reach the weft arrival timing detection sensor. In such a case, the above-described timing setting device becomes completely useless. In addition, in the weaving stage, in addition to the shortage of the weft supply described above, a weft error may occur due to a weft error due to a weft supply over (long pick). In such a weaving stage, the weft insertion is performed by the timing mechanism described above. Automatically controlling the nozzle pressure makes the machine unstable. For this reason, each time the loom is stopped due to a horizontal error, it takes a long time to reach a stable state even if the operator resets the pressure manually.

[0005] In particular, the setting of the pressure at the initial stage of weaving is performed based on the fabric conditions, the number of rotations of the loom, other machine conditions (main nozzle shape, lead type, whether or not the weft insertion nozzle is a tandem nozzle, etc.), and variations of the machine. It is often difficult for a skilled person or a person skilled in the art to set an appropriate pressure in the initial stage of weaving because it differs depending on the conditions.

[0006]

The object of the present invention is that when the initial pressure setting as described above is not appropriate, it is necessary to reset the pressure manually, and the work is troublesome, and the air with a horizontal error automatic processing device is provided. It is an object of the present invention to solve the problem that work cannot be performed smoothly until a target weft arrival timing is achieved even in a jet loom.

[0007]

SUMMARY OF THE INVENTION In the present invention, the above object is achieved by inserting a weft with a fluid ejected from a weft insertion nozzle, and adjusting the injection pressure of the weft insertion nozzle based on the detected arrival timing of the weft leading end. In the controlling jet loom, the initial injection pressure of the weft insertion nozzle in the weaving stage is set, weft insertion is performed at the initial injection pressure, and when a weft insertion error occurs, the weft insertion error is determined based on the information of the weft insertion error.
When it is determined that the insertion mistake is a show topic, the injection pressure of the weft insertion nozzle is increased to a value increased by a predetermined pressure.
Was set and the weft insertion error was judged to be a long pick
Sometimes the injection pressure of the weft insertion nozzle is reduced by a specified pressure
This is achieved by a method for controlling the pressure in the weaving stage of a jet loom, characterized by resetting the value to a preset value .

[0008]

In the present invention, the setting of the initial pressure in the weaving stage is not the timing of arrival of the weft, but the set value of the pressure is changed depending on whether or not the weft has arrived. That is, the initial injection
Weft insertion is performed under pressure, and if a weft insertion error occurs,
Based on the information of the mistake, the weft insertion mistake is a show topic
If it is determined that the injection pressure of the weft insertion nozzle
Reset to a value increased by the specified pressure, and weft insertion errors
If it is determined to be a gpic, the weft insertion nozzle
The firing pressure is reset to a value reduced by a predetermined pressure . Therefore, even if the setting of the initial pressure is not appropriate initially, it can be set to a mechanically appropriate set pressure value. In addition, since the pressure setting of the weft insertion nozzle is changed depending on whether or not the weft has arrived, even on a machine with a weft error automatic processing device, the loom can be restarted fully automatically from the beginning of the machine installation,
Operation until the target weft arrival timing is stabilized can be performed smoothly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a winding type weft measuring and storing device, which is operated by a retracting operation of a locking pin 2a of an electromagnetic solenoid 2. The yarn winding on the yarn winding surface 1a of the weft length measuring and storing device 1 and the unwinding of the weft from the yarn winding surface 1a are controlled.
Excitation and demagnetization of the electromagnetic solenoid 2 are performed by command control of the control computer C1. That is, the control computer C1 controls the excitation and demagnetization of the electromagnetic solenoid 2 based on the weft unwinding detection information from the weft unwinding detector 3 and the machine rotation angle information from the rotary encoder 15. That is,
Excitation is performed at a predetermined rotation angle, and weft insertion starts. afterwards,
When a predetermined number of weft unwinding is detected, the degaussing is performed, and the weft is locked by the locking pin. If a predetermined number of unwinds is not detected, degaussing is performed at a predetermined rotation angle. In the drawing, the input weft arrival timing is input by the input device 18.

That is, the injection action of the weft insertion men's nozzle 4 causes the weft Y to be drawn from the yarn winding surface 1a of the weft storage device 1.
Is drawn out from the main nozzle 4 and the weft Y
Is transferred to the relay injection by a plurality of auxiliary nozzle groups for weft insertion 5, 6, 7, 8 and when the weft insertion is performed well, the weft yarn Y is detected by the weft detector 9 in a predetermined machine rotation angle range. To detect. The weft presence / absence detection signal from the weft detector 9 is input to the control computer C1. The control computer C1 selects one of continuous operation and stop of the loom based on the weft presence / absence detection signal.

The injection of the weft insertion pressure air by the weft insertion main nozzle 4 is controlled by opening and closing the electromagnetic valve V1, and the injection of the weft insertion pressure air by the weft insertion auxiliary nozzle groups 5 to 8 is performed by the electromagnetic valves V2 and V3. , V4 and V5. The electromagnetic valve V1 is connected to the pressure air supply tank 10, and the electromagnetic valves V1 to V5 are connected to the pressure air supply tank 11. Each pressure air supply tank 1
Reference numerals 0 and 11 are connected to a source pressure tank 14 via electric pressure control valves 12 and 13.

The opening and closing of each of the electromagnetic valves V1 to V5 is controlled by a command from a control computer C1, and the control computer C1 instructs the opening and closing of the electromagnetic valves V1 to V5 based on a machine rotation angle detection signal from a rotary encoder 15. I do. This command data is set in the data memory of the control computer C1.
1 executes a weft insertion control command based on these data and the weft insertion control program input and set in the program memory.

Pressure detectors 16 and 17 are connected to the pressure air supply tanks 10 and 11, respectively.
7 is input to the control computer C2. The control computer C2 performs feedback control of the pressure control valves 12, 13 based on the pressure information from the pressure detectors 16, 17.

The control computer C2 controls the drive of the electric pressure control valves 12 and 13 based on a predetermined pressure control program, that is, controls the injection pressure in the weft insertion main nozzles 4 and the weft insertion auxiliary nozzle groups 5 to 8. .

A weft unwinding detector (balloon sensor) 3 is provided in the vicinity of the weft length measuring drum 1 to detect a weft unwound around the weft length measuring and storing drum 1 and input it to the computers C1 and C2. The number of times of weft unwinding is counted.

In the above apparatus, first, the initial pressure is appropriately set, and the operation of the loom is started. At this time, the following operation is performed if a horizontal error occurs until the operation is performed in a stable state at the target weft arrival timing.

When a weft error occurs, the balloon sensor (weft unwinding detector) 3 determines whether weft supply is insufficient (show topic) or weft supply is over (long pick). In this case, as a criterion for the determination, for example, a case where the weft amount wound on the weft length measuring and storing drum 1 is three for one pick is explained. Since the yarn is not unwound, only two or less unwinding signals from the weft unwinding detector (balloon sensor) 3 are transmitted. On the other hand, if the pick is a long pick, four or more unwinding signals from the weft unwinding detector (balloon sensor) 3 are transmitted. These signals are input to the control device C1 to determine whether the weft error at the occurrence of the weft error is a shortage of the weft supply or an excess of the weft supply.

When the controller C1 determines that the horizontal mistake is a show topic, the pressure supplied from the main nozzle 4 and the auxiliary nozzle is changed by a predetermined pressure by changing the settings of the electric regulators 12 and 13. Reset to the increased value. On the other hand, when it is determined that the length error is a long pick, the weft insertion nozzle pressure supplied from the main tank and the sub tank is lowered by the electric regulators 12 and 13 by a predetermined value and reset. In addition, the width of the pressure changed when resetting the pressure at the time of the horizontal error may be sequentially reduced according to the number of occurrences of the horizontal error.

In the illustrated embodiment, the arrival of the weft yarn Y is detected by the weft detector 9, the arrival timing data is sampled, and the weft insertion pressure air of the main nozzle 4 is determined based on the average of a predetermined number of data. The pressure control of the weft insertion pressure air of the auxiliary nozzle groups 5 to 8 is performed.

That is, for example, when pressure control is performed based on an average value of N data, if a weft insertion error occurs at the nth (n <N) times, this weft insertion error information (show topic or long pick) Pressure control is performed based on the arrival timing information (n
-1) and sampling the arrival timing again.

In this case, the control method of the present invention may be applied when a predetermined number of show topics or long pick mistakes occur before the number of weft insertions reaches N.

In the case where the loom is equipped with a weft error automatic processing device, the error yarn is automatically processed in this state, and the machine is automatically restarted. On the other hand, in a loom without the automatic weft error yarn processing device, when the pressure is reset, the loom waits for activation by an operator.

In the above embodiment, a weft unwind detector (balloon sensor) 3 provided with insufficient weft supply (show topic) and excess weft supply (long pick) near the position of the drum type weft measuring device is used. However, as in the embodiment shown in FIG. 2, the detection is performed by the weft detector (RH feeler) 9 and the additional weft detector (W feeler) 20 provided on the side opposite to the weft insertion nozzle. Is also good. In this case, when the weft supply is insufficient, no signal is input to the weft detector (RH feeler) 9, and when the weft supply is excessive, the signal is input to both the weft detectors (RH feeler, W feeler) 9 and 20. You can judge by entering.

In the apparatus shown in FIG. 2, FIG.
In the same manner as in the embodiment shown in FIG. 5, the conventional weft arrival timing is measured to automatically control the pressure of the weft insertion nozzle. That is, the arrival time of the weft inserted from the main nozzle 4 is measured by the weft detector (RH feeler) 9, the timing of the weft insertion is measured, and the pressure of the weft insertion nozzle is adjusted by the regulators 12 and 13. It has become.

[0026]

According to the present invention, even if the setting of the initial pressure is not appropriate, when a weft error occurs, it is automatically determined whether or not the weft error has occurred due to an insufficient supply of the weft yarn or an oversupply of the weft yarn. Since the pressure can be reset by a machine, there is no need to reset manually. Therefore, the operation before the target weft arrival timing is stabilized can be smoothly performed.

In the present invention, since the machine automatically sets the initial pressure even when the machine is equipped with a weft error automatic processing device, the loom can be restarted fully automatically, thereby stabilizing at the target weft arrival timing. The previous driving becomes smoother.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drum type weft measuring and storing device 3 weft unwinding detector (balloon sensor) 4 main nozzle 9 weft detector (RH feeler) 12 electric regulator 13 electric regulator 20 W feeler C1 controller C2 controller

Claims (1)

(57) [Claims] 1. A weaving machine in which a weft is inserted by a fluid injected from a weft insertion nozzle and a jet pressure of the weft insertion nozzle is controlled based on a detected arrival timing of the weft leading end. The initial injection pressure is set, and weft insertion is performed at the initial injection pressure. If a weft insertion error occurs, it is determined that the weft insertion error is a show topic based on the information on the weft insertion error. And
In the meantime, the injection pressure of the weft insertion nozzle was increased by a predetermined pressure
Reset to the value and judge that the weft insertion error is a long pick
When the injection pressure of the weft insertion nozzle is
A pressure control method in a weaving stage of a jet loom, wherein the pressure is reset to a lowered value .