JPH0551692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electromagnetic actuator operation timing measuring device for operating a loom component mechanism at a predetermined rotation angle of a loom main shaft using an electromagnetic actuator in a loom.

<Prior art and its problems> In recent looms, various loom constituent mechanisms are often operated using electromagnetic actuators.

For example, in the weft length measuring and storage device described in Japanese Patent Application Laid-Open No. 57-29640, the weft is wound around the circumference of a drum,
At a predetermined timing, the locking body is moved out of a hole formed on the circumferential surface of the drum to control the start of weft insertion, and is moved back in to regulate the weft length for one weft insertion. The body is actuated by an electromagnetic actuator.

Here, since the timing of entry and exit of the locking body has a great influence on the success or failure of weft insertion, the operation timing of the electromagnetic actuator must be precisely adjusted.

However, since there is a time delay between supplying or stopping the drive current to the electromagnetic actuator until the locking body operates, the electromagnetic It is necessary to adjust the timing of supplying or stopping the drive current to the actuator.

However, although this time delay can be predicted to a certain extent, there are variations for each electromagnetic actuator, for example in the range of about 5 to 10 ms.Even if the timing of supplying or stopping the drive current to the electromagnetic actuator is constant, It was not possible to accurately determine the actuation timing of the actuator.

In addition, in looms, especially in recent air-injection looms, the rotation speed of the main shaft is as high as 600 revolutions per minute.
The time required for one spindle rotation is 100ms. And since the weft insertion time is about 1/3 of that,
Must be done within 30ms. Therefore,
If there is a variation of 5 ms as described above with respect to this 30 ms, appropriate adjustment cannot be made.

For this reason, currently, after changing the supply or stop timing of drive current to the electromagnetic actuator,
Adjusting the operation of electromagnetic actuators is an extremely complicated task, as the actual operating timing is measured using a stroboscope or the like and adjustments are made repeatedly.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an operation timing measuring device that can easily measure the operation timing of an electromagnetic actuator in a loom.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a current detection circuit that detects a current supplied to an electromagnetic actuator via a switching circuit, and a current detection circuit that receives a signal from the current detection circuit. A bottom detection circuit that detects a temporary drop in current value when the signal rises and outputs a bottom detection signal, or a top detection circuit that detects a temporary rise in current value when the signal falls and outputs a top detection signal. at least one of the circuits; and an angle sensor that detects the rotation angle of the loom main shaft;
An operation timing measuring device is constituted by an arithmetic circuit that outputs the detected angle of the angle sensor when a detection signal is issued from the bottom or top detection circuit.

<Function> In other words, after the current is started to be supplied or stopped to the electromagnetic actuator, a temporary current change occurs when the actuator operates. Specifically, the current value temporarily decreases when the actuator starts up, and temporarily decreases when it falls. This causes an increase in the current value, so this change is detected by the bottom or top detection circuit via the current detection circuit, and the rotation angle of the main shaft at which this change occurs is output from the calculation circuit, thereby determining the operation timing of the electromagnetic actuator. It is designed to measure.

<Example> Examples of the present invention will be described below based on the drawings.

FIG. 1 shows the configuration of a device for measuring the operation timing of an electromagnetic actuator when the locking body of the weft length measuring and storage device is actuated by the electromagnetic actuator.

In FIG. 1, the weft length measuring and storage device 1 includes a drum 2 held stationary, a winding guide 3 that rotates around the drum 2 and winds the weft W around the circumferential surface of the drum 2, and a drum 2. A locking body 5 that enters into and exits a hole 4 provided in 2 is provided. Here, the rotation of the winding guide 3 is controlled so that one pick or more of the weft yarn W is always stored in the drum 2. Locking body 5
is actuated by an electromagnetic actuator 6 at a predetermined timing. The weft W from the weft length measuring and storage device 1 is passed through a guide 7 to a main nozzle 8 for inserting the weft. Reference numeral 9 denotes an on-off valve provided in the supply path of pressurized air to the main nozzle 8.

A drive current is supplied to the electromagnetic actuator 6 from a power source 10 via a current detection circuit 11 and a switching circuit 12. The switching circuit 12 is turned ON from the control circuit 13,
It is turned on and off by the OFF signal, and a signal from the angle sensor 14 is input to the control circuit 13. The angle sensor 14 rotates in conjunction with the main shaft of the loom and is placed opposite a rotating body 15 having 360 protrusions around the periphery.The angle sensor 14 counts up by 1° each time a protrusion is detected, with the time of beating the reed being 0°. outputs an angle signal of 0° after 359°. A control circuit 13 that receives a signal from this angle sensor 14
outputs an ON signal to the switching circuit 12 at a preset angle, for example 100 degrees, and outputs an OFF signal to the switching circuit 12 at a preset angle of 230 degrees.

As the operation timing measuring device for the electromagnetic actuator 6, the switching circuit 12 is connected between the power source 10 and the switching circuit 12 as described above.
A current detection circuit 11 is provided to detect the current supplied to the electromagnetic actuator 6 via the electromagnetic actuator 6. and,
The output terminal of the current detection circuit 11 is connected to a bottom/top detection circuit 16. B of this bottom/top detection circuit 16 is an output terminal for a bottom detection signal, and T is an output terminal for a top detection signal. These output terminals B and T are connected to an arithmetic circuit 17. This arithmetic circuit 17 is also connected to the angle sensor 14, and outputs an angle signal from the angle sensor 14 when the bottom detection signal or top detection signal is input. The output terminal of the arithmetic circuit 17 is connected to the display device 18,
This display device 18 digitally displays the angle signal from the arithmetic circuit 17, and is capable of selectively displaying the bottom detection signal and the top detection signal.

Next, the operation will be explained with reference to FIG. 2.

During operation of the loom, the rotating body 15 rotates in synchronization with the rotation of the loom main shaft, and the angle sensor 14 successively outputs angle signals corresponding to the rotation angle of the loom main shaft. In response to this, the control circuit 13 turns on the switching circuit 12 when the angle reaches 100 degrees as described above. As a result, a current flows through the coil of the electromagnetic actuator 6, the armature is pulled downward in the figure, and the locking body 5 connected thereto is pulled out from the hole 4. Since the on-off valve 9 is opened and air is injected from the main nozzle 8 a little before the locking body 5 is pulled out, the weft W is pulled out while being rewound around the drum 2, and the weft is inserted. It will be done. When the angle reaches 230 degrees, the switching circuit 12 is turned off by the control circuit 13, the electromagnetic actuator 6 is de-energized, the armature is moved by the built-in spring, and the locking body 5 is pushed into the hole 4. As a result, the weft W being rewound from the drum 2 is locked by the locking body 5, and weft insertion is completed.
Therefore, while the locking body 5 is being pulled out from the hole 4, a predetermined number of turns of the weft W are unwound and the weft insertion length is determined.

Here, when the switching circuit 12 is turned on as described above, the current detection circuit 11 detects a current value as shown in FIG. The temporary current value drop A at the rising edge occurs when the armature starts moving, and the temporary current value rise B at the falling edge also occurs when the armature starts moving.

When the current detection circuit 11 detects a temporary decrease in the current value at the time of rising, a bottom detection signal is output from the B terminal of the bottom/top detection circuit 16. As a result, the arithmetic circuit 17 outputs the angle signal from the angle sensor 14 when receiving this bottom detection signal. In response to this angle signal, the display device 18 displays the angle.

Further, when the current detection circuit 11 detects a temporary rise in the current value at the time of falling, a top detection signal is output from the T terminal of the bottom/top detection circuit 16. As a result, the arithmetic circuit 17 outputs the angle signal from the angle sensor 14 when receiving this top detection signal. In response to this angle signal, the display device 18 displays the angle.

Therefore, based on these displays, the display
Control circuit 13 is turned ON and OFF so that the angle becomes 100° and 230°.
Adjust the signal transmission timing. That is, when the transmission timing of the ON and OFF signals of the control circuit 13 is set in advance to 100° and 230°, due to the delay time, the actuation timing of the electromagnetic actuator 6 and therefore the locking body 5 is delayed from the setting, and Since this will be displayed, advance the transmission timing so that the activation timing is 100° and 230°.

FIG. 3 shows an embodiment in which the ON/OFF timing of the electromagnetic actuator is automatically compensated based on the measurement results of the actuation timing.

The same parts as in the previous embodiment are given the same reference numerals, and the different parts will be explained as follows: arithmetic circuit 1
The output of 7 is input to a comparator circuit 20. This comparison circuit 20 compares the extraction timing (for example, 100 degrees) and entry timing (230 degrees) of the locking body 5 set in the presetter 21 with the output from the arithmetic circuit 17, which is the actual timing, and calculates the difference between them. Output. The output of this comparison circuit 20 is input to a compensation circuit 22. This compensation circuit 22
is an ON signal and an OFF signal from the control circuit 13 so that the difference is eliminated based on the output from the comparison circuit 20.
Adjust the signal transmission timing.

To explain the operation, for example, when a bottom detection signal is obtained at 105 degrees, the calculation circuit 17 detects that angle.
Since 105° is output as the actual extraction angle of the locking body 5, in the comparator circuit 20, the presetter 2
The extraction angle of 1 is compared with 100°, and the difference of +5° is output to the compensation circuit 22. This compensation circuit 22 outputs a control signal to the control circuit 13 so that the ON signal from it is outputted 5 degrees earlier, that is, outputted at 95 degrees. Therefore, during the next weft insertion, the bottom detection signal is generated at the point of 100°, the output of the comparison circuit 20 becomes 0°, and the control circuit 1
3 maintains the ON signal transmission timing at 95 degrees.
Conversely, when the output of the comparator circuit 20 is, for example, -5° and actual extraction is being performed at 95°, the timing at which the control circuit 13 outputs the ON signal is delayed by 5°.

The entry timing of the locking body 5 is similarly controlled.

Therefore, according to this embodiment, the entry and exit timings of the locking body 5 are automatically adjusted to the preset values.

In the above embodiments, control is performed based on the angle signal, but this may be replaced with a time signal so that the angle signal can be obtained indirectly. In other words, control is performed by replacing 1° with the time required. In this case, the angle sensor is
It is sufficient to transmit only the reference angle signal during rotation, and it is sufficient to measure the time from the reference angle signal to the bottom detection signal or the top detection signal.

In addition, in the above description, the drum type weft length measuring and storage device 1
Although the electromagnetic actuator 6 of the locking body 5 of the weft W in is described as an example, the electromagnetic actuator to which the present invention is applied is not limited to this.
For example, it can be applied to an electromagnetic on-off valve 9 interposed in the air supply path to the main nozzle 8, a rotary solenoid that performs various switching operations, and the like.

<Effects of the Invention> As described above, according to the present invention, the operation timing of the electromagnetic actuator can be determined accurately without using a stroboscope or the like, so that adjustment work can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, and FIG.
The figure is a timing chart showing its operation, and FIG. 3 is a schematic diagram showing another embodiment. 1... Weft length measuring storage device, 5... Locking body, 6...
...Electromagnetic actuator, 10...Power supply, 11...
Current detection circuit, 12...Switching circuit, 13
...Control circuit, 14...Angle sensor, 16...
...Bottom/top detection circuit, 17...Arithmetic circuit,
18... Display device, 20... Comparison circuit, 22...
Compensation circuit.

Claims (1)

[Claims] 1. In a loom in which an electromagnetic actuator 6 operates a loom component mechanism 5 at a predetermined rotation angle of a loom main shaft, a current detection circuit 11 detects a current supplied to the electromagnetic actuator 6 via a switching circuit 12; A bottom detection circuit receives a signal from the current detection circuit 11, detects a temporary drop in current value at the rising edge of the signal, and outputs a bottom detection signal, or detects a temporary increase in current value at the falling edge of the signal. at least one of the top detection circuits 16 that outputs a top detection signal from the top, and an angle sensor 14 that detects the rotation angle of the main shaft of the loom;
An operation timing measuring device for an electromagnetic actuator in a loom, comprising an arithmetic circuit 17 that outputs the angle detected by the angle sensor 14 when a detection signal is issued from the bottom or top detection circuit 16.