JPH09250054A - Picking controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out control of reaching timing of weft having good responsiveness while making the conveying force of a picking nozzle as object of control. SOLUTION: This picking device 1 is constituted so that solenoid valves (18 and 19) of pressure air source (16 and 17) with picking nozzles (10 and 11) are driven in picking and pressure airs (12 and 13) are jetted from picking nozzles (10 and 11) and weft 3 is picked into an opening 15. In this case, picking controller 2 is composed of a driving controlling part for opening and closing solenoid valves (18 and 19) every pulse by a driving signal of pulse row in picking, a detector 20 for picking reaching timing and a driving order part for changing pulse width and pulse interval of a driving signal to the direction solving deviation of weft reaching timing and a standard value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the arrival timing of weft threads by adjusting the carrying force of weft insertion nozzles.

[0002]

2. Description of the Related Art The control of the arrival timing of a weft thread is usually performed by changing the pressure of pressurized air to a main nozzle by using a pressure control valve. According to such a control operation by the pressure control valve, the response of the pressure change is poor due to the operation delay of the pressure control valve, and the wed insertion is likely to be unstable in the process of changing the control.

Further, Japanese Patent Laid-Open No. 2-41441 discloses that an electromagnetic on-off valve is intermittently opened and closed by a pulsed drive signal in the process of supplying pressurized air of a predetermined pressure.
It is disclosed that a pressure control valve is not used and an operation delay when using the pressure control valve is eliminated.

Further, in Japanese Patent Laid-Open No. 3-206149, a solenoid valve provided between a source pressure air source and a tank is driven by a pulsed drive signal and driven at a constant arrival timing. The tank pressure is adjusted by changing the pulse characteristics of the signal.

[0005]

2. Description of the Related Art The invention of the above-mentioned Japanese Patent Laid-Open No. 2-41441 discloses that in order to obtain pressurized air having a necessary pressure value,
The electromagnetic valve is digitally controlled, and there is no mention of applying a pulsed drive signal to control the arrival timing of the weft thread. Also, Japanese Patent Laid-Open No. 3-2061
In the invention of Japanese Patent No. 49, since the tank pressure is adjusted, it takes time until the supply pressure of the weft insertion nozzle actually changes, the control response is poor, and the arrival timing matches the target value. By the time you do, the unstable state continues.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to control the arrival timing of a weft yarn with good responsiveness while controlling the conveying force of the weft insertion nozzle.

[0007]

To achieve the above object, the present invention drives a solenoid valve provided between a pressure air source and a weft insertion nozzle to drive the pressure air from the pressure air source into the weft insertion nozzle. In the weft insertion device that injects the weft yarn into the opening of the warp yarn by injecting from, when the weft insertion, by outputting the drive signal of the pulse train from the drive control unit to the solenoid valve, the solenoid valve is operated for each pulse. In the control process of opening and closing, the arrival timing of the weft thread is detected by the detector, the drive control unit obtains the deviation between the arrival timing of the weft thread and the reference value, and the pulse train characteristic of the drive signal of the pulse train in the direction of eliminating this deviation. That is, by changing at least one of the pulse width and the pulse interval, the pressure of the pressure air supplied to the wetting nozzle is changed to Adjust the conveying force of the nozzle, and realizes the control of the arrival timing of the good response weft.

The weft insertion nozzle to be controlled is mainly a main nozzle, but it may be a sub nozzle or a main nozzle and a sub nozzle. Further, the solenoid valve is usually a spring return type, which is opened when energized or de-energized, but may be of a type that is driven bidirectionally by an electromagnetic coil at a high speed. Further, the arrival timing of the weft thread is usually the timing of detecting the tip of the weft thread at the weave end portion on the side opposite to the weft insertion side, but it may be the timing of detecting the tip of the weft thread at a predetermined position in the weaving width, or the predetermined timing. It may be the unwinding timing when the length weft is unwound from the length measuring and storage device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, FIG. 1 shows the relationship between a weft insertion device 1 and a weft insertion control device 2. In the weft insertion device 1, the weft yarn 3 is supplied from a yarn feeder 4, and is guided inside a rotary yarn guide 8 of a drum type length measuring and storing device 5, for example. When the rotating yarn guide 8 is rotated, the weft thread 3 locked by the locking pin 7 is wound around the drum 6 on the outer peripheral surface of the drum 6, and the length is measured for a length required for one pick weft insertion. , It will be stored until the time of putting katsuko. At the start of weft insertion, the solenoid 9
By retracting the locking pin 7 from the outer peripheral surface of the drum 6, the weft thread 3 in the length measurement storage state is unwound on the outer peripheral surface of the drum 6.

On the other hand, the main nozzle 10 as a weft insertion nozzle is near the weft end on the weft insertion side, and injects the pressure air 12 toward the opening 15 of the warp yarn 14 over the injection period from the start to the end of the weft insertion. As a result, the weft thread 3 guided into the main nozzle 10 is inserted into the opening 15. At the same time, the plurality of groups of sub-nozzles 11 as weft insertion nozzles relay the pressure air 13 continuously or in a state synchronized with the flight speed of the weft thread 3 over the flight period of the weft thread 3. By this, the flight of the weft thread 3 is accelerated.

Pressure air 12, 13 for this weft insertion
Are supplied from the pressure air sources 16 and 17, respectively, and are supplied by the open state of the solenoid valves 18 and 19 provided between the pressure air sources 16 and 17 and the main nozzle 10 and the sub nozzle 11, respectively. There is. These solenoid valves 18 and 19 are controlled by the weft insertion control device 2.

The tip of the weft thread 3 that has been wefted is detected by the detector 20 in association with the rotation angle θ of the weaving machine at, for example, the position of the weft edge on the anti-weft insertion side, and is sent to the weft insertion control device 2 as a weft arrival signal. Sent in. After that, the weft thread 3 is struck by the reed 42 before weaving.

Next, FIG. 2 shows the construction of the weft insertion control device 2. The weft insertion control device 2 outputs the pulse train drive signals Dm and Ds to the solenoid valves 18 and 19 at the time of weft insertion, and the drive control unit 21 that opens and closes the solenoid valves 18 and 19 for each pulse, and the weft thread arrival timing θa and the reference. A deviation Δθ from the value θo is obtained, and at least one of the pulse width t1 and the pulse interval t2 of the pulse train drive signals Dm and Ds is changed in a direction to eliminate the deviation Δθ, thereby changing the pulse train characteristic. 22.

The drive control unit 21 receives an encoder 23 connected to the main shaft 28 of the loom and a signal of the rotation angle θ of the encoder 23 as an input, and unwind timing required for controlling the locking pin 7 and the solenoid valves 18, 19. Timing controller 2 for generating signal Tp, injection timing signals Tvm, Tvs
4, the injection timing signals Tvm and Tvs, and the pressure command P signal as input, and the driver 2 for the solenoid valves 18 and 19
It is assembled by a chopping controller 25 that drives 6, 27.

The drive command unit 22 receives the weft yarn arrival signal from the detector 20, and detects the weft yarn arrival timing θa on the rotation angle θ. The arrival detector 29, the weft yarn arrival timing θa and the target setting device 31. The deviation calculator 30 that generates a deviation Δθ by comparing the target value set by the above, that is, the reference value θo, and the deviation Δθ from the manipulated variable ΔP.
Variable calculator 32 which calculates the variable ΔP and the setting device 34
The pressure commander 33 compares the initial pressure value Po set by the pressure command generator and generates a signal of the pressure command P.

During the weft insertion, the deviation calculator 30 compares the signal of the weft thread arrival timing θa from the arrival detector 29 with a preset reference value θa, and the rotation angle θ of the main shaft 28.
The deviation Δθ is obtained above and output to the manipulated variable calculator 32. Here, the manipulated variable calculator 32 calculates the deviation Δθ as the pressure manipulated variable ΔP
And outputs it to the pressure command device 33. Here, the pressure command device 33 outputs a signal of the pressure command P with the pressure operation amount ΔP and the preset initial pressure value Po as inputs. The signal of the pressure command P is changed to eliminate the deviation Δθ. Specifically, when the actual weft arrives late and a deviation Δθ occurs, the pressure command P is changed so that the pressure becomes higher, and when the weft arrives early and the deviation Δθ occurs, The pressure command P is changed so that the pressure becomes lower. Then, in accordance with the changed pressure command P, at least one of the pulse width t1 and the pulse interval t2 of the pulse train drive signals Dm and Ds, that is, the characteristic of the pulse train is changed.

On the other hand, the timing controller 24 generates an unwinding timing signal Tp to drive the locking pin 7 over an unwinding period corresponding to the weft insertion period in synchronization with the rotation of the main shaft 28, Main nozzle 1
The injection timing signal Tvm over the injection period of 0,
Further, it outputs an injection timing signal Tvs over the injection period of the sub nozzle 11. Therefore, the chopping controller 25 causes the injection timing signal Tvm,
The pulse width t1 or the pulse interval t2 or the pulse width t1 of the drive signals Dm and Ds over the generation period of Tvs.
And by changing the pulse interval t2 in the increasing or decreasing direction based on the signal of the pressure command P, the drive signals Dm and Ds of an appropriate pulse train for eliminating the deviation Δθ are output to the respective drivers 26 and 27. There is.

As a result, as shown in FIG. 3, the solenoid valve 1
8 and 19 repeat opening and closing in synchronization with the pulse train drive signals Dm and Ds over the injection period. In this way, the supply pressure waveform of the pressurized air 12, 14 supplied to the main nozzle 10 and the sub nozzle 11 changes into a triangular waveform.

FIG. 4 shows, as an example, the state of changes in the pressure waveform supplied to the main nozzle 10 corresponding to the drive signal Dm of the pulse train for the main nozzle 10. The solenoid valve 18 is in the open state only during the time when the pulse is output (pulse width t1), and the pressure on the output side of the solenoid valve 18 rises to reach the input side pressure (initial pressure value Po) during this period. Also, the time during which no pulse is output (t2-
At t1), the solenoid valve 18 is closed, and during this time,
The pressure on the output side decreases. Here, if the pulse width t1 is increased and the pulse interval t2 is reduced or fixed in proportion to the pressure command P, the maximum value of the pressure air supplied to the main nozzle 10 gradually increases. In this way, the pressure value of the pressurized air 12 supplied to the main nozzle 10 changes in the direction in which the deviation Δθ of the arrival timing θa is eliminated. At the initial pressure value Po, the pulse width t1,
The pulse interval t2 is an initial value (t1 = t10, t
2 = t20).

The pulse width t1 may be fixed and the pulse interval t2 may be changed. For example, when decreasing the pressure, the pulse interval t2 may be increased, and when increasing the pressure, the pulse interval t2 may be decreased. Further, the control target may be only the main nozzle 10, and at this time, the sub nozzle 1
In No. 1, the solenoid valve 19 is continuously opened to keep the pressure constant as in the conventional case. Conversely, the control target may be only the sub nozzle 11.

Without calculating the pressure in the direction of eliminating the deviation Δθ,
The characteristics of the pulse train may be changed directly from the deviation Δθ. That is, when deviation Δθ occurs, pulse width t1 + Δt1 → pulse interval t2-Δt2, pulse width t
The pulse characteristics may be changed as 1−Δt1 → pulse interval t2 + Δt2. Also, the weft arrival timing θa
As described above, the detection may be performed in the course of the flight path of the weft thread 2, or the weft thread arrival timing θa can be indirectly measured from the unwinding length of the weft thread 2.

Next, in the example of FIG. 5, the pressure on the output side of the solenoid valve 18 is detected by the pressure sensor 35 between the solenoid valve 18 and the main nozzle 10, and the pressure value is measured by the waveform shaper 36.
After waveform shaping by, as a feedback signal,
Addition point 3 on the input side of the choping controller 25
7 is an example in which the pulse train characteristics are corrected by feedback control after being sent to No. 7.

In the example of FIG. 6, the pulse train characteristics (pulse width t1, pulse interval t2) corresponding to the pressure are stored in the storage device 3.
8 to store an address (AD) by the signal of the pressure command P corresponding to the pressure obtained by the pressure command device 33, and read out the pressure command P (DATA) of the pulse train characteristic corresponding to the address. And outputs the result to the chopping controller 25. The address and the data are previously input to the storage device by the data input device 40, the pattern calculator 41, and the like.

Further, the examples of FIGS. 7, 8 and 9 are provided with a weft insertion nozzle, for example, a main nozzle, in order to provide a finer intermittent supply of the compressed air, in other words, to make it possible to make the change range of the pressure smaller. Two solenoid valves 18a and 18b are installed in parallel between the valve 10 and the pressure air source 16, and a drive signal Dm as an output of the chopping controller 25 is provided.
In this example, a and a drive signal Dmb obtained by inverting the signal a by the inverting circuit 43 are output to the respective solenoid valves 18a and 18b.

The weft insertion control device 2 (the drive control unit 21, the drive command unit 22) simultaneously changes at least one of the pulse width t1 and the pulse interval t2 or both in accordance with the deviation Δθ of the arrival timing θa. . However, it is desirable to change the two solenoid valves 18a and 18b within a range in which they do not open simultaneously.

As a result, the air supply cycle to the main nozzle 10 is a combination of the two drive signals Dma and Dmb. Therefore, the main nozzle 10
The pressure air 12 supplied to the two drive signals Dma,
Corresponding to Dmb, they are supplied in a partially overlapped state as triangular wave shapes having different heights on the time axis.

Further, as shown in FIG. 10, one driving signal Dma has a pulse width t1a and a pulse interval t2a, and the other driving signal Dmb has a pulse width t2b and a pulse interval t2b.
, And the phases are different, the pressure air 12 supplied to the weft insertion nozzle (main nozzle 10) is of the same size and is alternately repeated, and is supplied in a partially overlapped state. .

Although the above-mentioned specific example is an example in which two solenoid valves 18 are provided in parallel, three or more solenoid valves are provided in parallel and drive signals of three pulse trains having mutually different phases are provided. Alternatively, they may be alternately driven.

[0029]

According to the present invention, the weft thread arrival timing control by changing the conveying force of the weft insertion nozzle, specifically, the arrival timing control by changing the average value of the pressure is realized with quick response. This enables stable and stable weft insertion. In particular, the pressure air is intermittently jetted in pulses, and the pulsed jet air effectively acts on the flying weft yarns, so that the carrying force decreases or becomes unstable during weft insertion. Stable weft insertion is possible without becoming worn.

[Brief description of drawings]

FIG. 1 is a block diagram of a weft insertion device.

FIG. 2 is a block diagram of a weft insertion control device.

FIG. 3 is a time chart showing the operation of an electromagnetic valve in response to a drive signal of a pulse train and a change in pressure air supplied to a weft insertion nozzle.

FIG. 4 is a time chart of a change in pressure of pressurized air supplied to a weft insertion nozzle with respect to a drive signal of a pulse train.

FIG. 5 is a block diagram of a part of the weft insertion control device.

FIG. 6 is a block diagram of a part of the weft insertion control device.

FIG. 7 is an explanatory diagram of an example in which solenoid valves are provided in parallel.

FIG. 8 is a block diagram of drive parts for two solenoid valves.

FIG. 9 is an explanatory diagram of a supply cycle of pressure air and a waveform of pressure air for a drive signal of two pulse trains.

FIG. 10 is an explanatory diagram of a supply cycle of the compressed air and a waveform of the compressed air with respect to a drive signal of two pulse trains.

[Explanation of symbols]

 1 Weft insertion device 2 Weft insertion control device 3 Weft insertion device 10 Main nozzle 11 Sub nozzle 12 Pressure air 13 Pressure air 14 Warp yarn 15 Opening 16 Pressure air source 17 Pressure air source 18 Solenoid valve 19 Solenoid valve 20 Detector 21 Drive control unit 22 Drive command Department

Claims (2)

[Claims] 1. A pressure air source (16, 1) at the time of weft insertion.
7) and the solenoid valve (18, 19) provided between the weft insertion nozzle (10, 11) are driven, and the pressure air source (1
6,17) Wefting device (6) for wetting the weft thread (3) into the opening (15) of the warp thread (14) by injecting pressurized air (12, 13) from the weft insertion nozzle (10, 11). In 1), the drive signal of the pulse train is added to the solenoid valve (18, 1
9), a drive control section (21) for opening and closing the solenoid valves (18, 19) for each pulse, a detector (20) for detecting the weft thread arrival timing, and a weft thread as an output of the detector (20). A drive command unit that obtains a deviation between the arrival timing and a preset reference value, and changes at least one of the pulse width (t1) and the pulse interval (t2) of the drive signal of the pulse train in the direction of eliminating the deviation. (22) A weft insertion control device (2) comprising: 2. Two or more solenoid valves (18, 1) between the pressurized air source (16, 17) and the weft-in nozzle (10, 11).
9) are provided in parallel, and two or more solenoid valves (18, 1) are provided by the drive signal of the pulse train as the output of the drive controller (21)
9. The weft-insertion control device (2) according to claim 1, wherein 9) are alternately opened and closed.