JP2001099785A - Method and device for automatic inspection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically inspect the web of woven cloth precisely in response to various weave styles. SOLUTION: Light reflecting a finish condition of nondefective normal woven cloth is detected, and an electric output signal corresponding to a received amount of the light is produced as a reference signal pattern. The reference signal pattern is stored in relation to the weave style of the normal woven cloth. When inspecting the woven cloth to be inspected, the reference signal pattern corresponding to the weave style of the woven cloth to be inspected is read out and light reflecting a finish condition of the woven cloth to be inspected is detected. A measured output signal pattern corresponding to the received amount of the light is detected and the read out reference signal pattern and the measured output signal pattern are compared to determine whether the inspected woven cloth has a defect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection method and apparatus for automatically detecting a weaving defect of a woven fabric after weaving.

[0002]

2. Description of the Related Art During weaving, even if the loom is automatically stopped due to a trouble such as warp breakage or poor weft insertion, or automatically stopped by an operator, the cause of the stop is eliminated, and the loom is restarted. However, when the loom is restarted, weaving steps such as stop steps (thick and thin steps) are likely to occur due to lack of beating force. These are left as weaving scratches.

[0003] For this reason, for the woven fabric,
In order to confirm the presence or absence of these weaving defects, inspection is generally performed visually by an operator. In this inspection, workers must usually monitor the woven fabric surface with caution over the entire woven width and length of the woven fabric, because the location of the weaving steps or scratches is not known in advance. Must.

However, at the time of inspection, the woven fabric surface is constantly monitored carefully because the woven fabric is traveling at a considerably high speed and a bright light is applied to the woven fabric surface. This will cause the eyes of the worker to be quite tired. Such work is not only unfavorable in terms of occupational health, but also the inspection work itself may be inaccurate.

[0005] In addition, while there are many multi-product small-quantity productions, inspection work must cope with various weaving styles. In this case, since the criterion for determining the presence or absence of a weaving defect differs for each weaving style, such inspection work is extremely difficult. The weaving style refers to a weaving style determined by weaving data such as the yarn type, the density of the weft and the warp, the weaving structure, and the width of the woven fabric.

On the other hand, the automatic detector detects a woven defect by irradiating a woven cloth to be inspected with tungsten light or laser light from a large change in the amount of transmitted light or reflected light. Even with this automatic detector, when the weaving style changes,
Since the amount of light changes, it is difficult to accurately detect a weaving defect in a state suitable for the weaving style.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to accurately perform automatic inspection of a woven fabric corresponding to various weaving styles.

[0008]

According to the above object, an automatic inspection method according to the present invention detects light reflecting a normal weaving state of a woven fabric having no defect, and detects an electric current corresponding to the amount of received light. The reference signal pattern is created as a reference signal pattern, and the reference signal pattern is stored in association with the normal weaving style of the woven fabric. The reference signal pattern corresponding to the style is read out, light that reflects the weaving state of the woven fabric to be inspected is detected, an actually measured output signal pattern corresponding to the amount of received light is detected, and the read reference signal is detected. By comparing the pattern with the actually measured output signal pattern, it is determined whether or not there is a defect in the woven fabric to be inspected.

Further, the automatic inspection apparatus of the present invention, based on the automatic inspection method described above, generates an electrical output signal corresponding to the amount of light received which reflects a normal weaving state of a woven cloth having no defect. A storage device for storing a reference signal pattern in association with a normal woven fabric weaving style, and a reference signal pattern corresponding to the woven style of the woven fabric to be inspected is read from the storage device to generate a reference signal pattern And a photoelectric sensor that detects light reflecting the weaving state of the woven fabric to be inspected and generates an electrical measurement output signal pattern corresponding to the amount of received light, and a photoelectric sensor from the photoelectric sensor. A comparison / determination unit that compares an actually measured output signal pattern with a reference signal pattern read from the storage device by the reference signal generator to determine whether there is a defect in the woven fabric to be inspected. , In it is configured.

In the above comparison, (1) the difference between the read reference signal pattern and the actually measured output signal pattern is obtained,
(2) Size comparison between the average value of the read reference signal pattern and the average value of the actually measured output signal pattern in the full width or the specific width; (3) Size comparison of the read reference signal pattern The comparison is performed by comparing the differential waveform with the differential waveform of the actually measured output signal pattern, and (4) comparing the number of peaks (number of peaks and valleys) of the read reference signal pattern with the number of peaks of the actually measured output signal pattern. .

The above-mentioned reference signal pattern and output signal pattern are created as a woven fabric width on the horizontal axis and an output signal of the photoelectric sensor on the vertical axis.

Whether the weaving style of the woven fabric to be inspected is determined by a style determiner based on the weaving data,
Or, it is artificially specified by the style designator. Of course, as described above, the weaving style is determined by set values such as the yarn type, the density of the weft and the warp, the weave structure, and the width of the woven fabric.

[0013]

FIG. 1 shows an automatic inspection apparatus 1 based on the automatic inspection method of the present invention. The automatic inspection apparatus 1 is attached to, for example, a loom and is woven cloth 2
Has a reflective photoelectric sensor 3 at a position opposed to the position, and is provided by a feeding means 4 such as a screw / nut / feed motor.
The woven fabric 2 is provided so as to be movable in the weaving width direction. The output of the photoelectric sensor 3 is sent to the amplifier 5 and amplified,
The internal memory 9 of the storage device 7 is operated by the changeover switch 6.
Alternatively, it is sent to the comparison / determination unit 8.

The storage device 7 stores the weave style set by the style designator 22 or the style determiner 10.
A reference signal pattern corresponding to a normal woven fabric 2 having no weaving defect is read out from the memory 9 and sent to the reference signal generator 11 in accordance with the weaving style automatically set. Here, the reference signal generator 11 generates a reference signal pattern corresponding to a normal woven fabric 2 having no weaving defect, and sends it to the comparison / determination unit 8.

The style judging device 10 takes in the weaving data such as the yarn type, the weaving structure and the woven fabric width from the controller 13 inside the weaving machine control device 12, and sends the weft and warp yarns from the weaving density setting device 14. The weaving data of the density is taken in, and the weaving style is determined from the weaving data.

Incidentally, the controller 13 controls the main shaft 20 of the loom at the time of weaving in accordance with the density of the weft and the warp from the weaving density setting device 14 and the opening / wefting pattern from the shedding / wefting pattern setting device 15. The weft insertion device 16, the opening device 17, the feeding device 18, and the winding device 19 of the loom are driven in accordance with the angle signal from the connected encoder 21.

Prior to the inspection of the woven cloth 2 to be inspected, the operator switches the changeover switch 6 to the memory 9 in order to create a reference signal pattern. In this state, the photoelectric sensor 3 scans the normal woven portion of the normal woven fabric 2 having no woven defects from one woven end to the other woven end, and outputs an output signal corresponding to the normal woven fabric 2. This is generated and stored in the memory 9 as a reference signal pattern in association with the weaving style of the woven fabric 2 at that time.
This is done for many weave styles. Thereafter, the changeover switch 6 is switched to the input side of the comparison / determination unit 8 by the operator.

FIG. 2 shows an example of the reference signal pattern. The reference signal pattern is expressed as a woven cloth width on the horizontal axis and an output (output voltage or output current) of the photoelectric sensor 3 on the vertical axis. According to the weaving style, a substantially constant level sinusoidal waveform is shown as a solid line. It appears as.

Before the inspection, the worker sets the style designator 22
Is operated to designate the weaving style during weaving, or in place of this designation, the style judging device 10 is operated. As described above, the style determiner 10 automatically determines the weaving style from the weaving data, sends it to the memory 9 of the storage device 7, and specifies the content to be read. Therefore, the storage device 7 reads the reference signal pattern corresponding to the specified weaving style from the memory 9 and outputs this to the reference signal generator 11.

Here, the reference signal generator 11 sends a reference signal pattern corresponding to a normal woven fabric 2 to the other input end of the comparison / determination unit 8. In the weaving process, the photoelectric sensor 3 irradiates the surface of the woven fabric 2 with light, detects the reflected light, and generates an electrical output signal corresponding to the amount of received light. The signal is sent as an actually measured output signal pattern to one input terminal of the comparison / determination unit 8 via the amplifier 5 and the changeover switch 6. The comparison / determination unit 8 compares the read reference signal pattern with the actually measured output signal pattern to determine the presence or absence of a weaving defect in the woven fabric 2, and determines the presence or absence of a defect according to the determination result. Generate an output signal.

As described above, this comparison is performed by (1) taking the difference between the read reference signal pattern and the actually measured output signal pattern, and comparing the difference with the allowable value; Comparison of the average value of the read reference signal pattern with the average value of the actually measured output signal pattern,
(3) magnitude comparison between the differentiated waveform of the read reference signal pattern and the differential waveform of the actually measured output signal pattern; (4) the number of peaks (number of peaks / valleys) of the read reference signal pattern and the actually measured output signal pattern In addition to comparison with the number of peaks,
The comparison is performed by a combination of these.

The automatic inspection device 1 uses the storage function of the computer as the storage device 7 and the reference signal generator 11, and uses the operation function of the computer to perform the function of the comparison judgment device 8 and the style judgment device. The computer can be configured by performing the functions of the ten functions. Further, instead of the photoelectric sensor 3 which moves one object in the weaving width direction, a large number of photoelectric sensors 3 are arranged in the weaving width direction, and the signals of these many photoelectric sensors 3 are electrically scanned. Alternatively, the light can be obtained by scanning the light from one light source by a polygon mirror in the weaving width direction and sequentially detecting the light by a large number of photoelectric sensors 3 arranged in the weaving width direction. . Of course, the amount of light detected by the photoelectric sensor 3 is not limited to light reflected from the surface of the woven fabric 2 to be inspected, but may be transmitted light.

[0023]

According to the present invention, a reference signal pattern is stored for each weaving style of a woven fabric, and when a woven fabric to be inspected is inspected, a reference signal pattern corresponding to the weaving style and a woven fabric to be inspected are stored. Since the output signal pattern of the woven fabric is compared with the output signal pattern of the woven fabric, it is accurately determined whether or not there is a woven defect, and the accuracy of inspection is improved.

In the embodiment in which the weaving style is automatically judged by the style judging device from the weaving data such as the yarn type, the density of the weft and the warp, the weaving structure and the width of the woven fabric, the operation for specifying the weaving style can be omitted. This also reduces operation errors and the like.

[Brief description of the drawings]

FIG. 1 is a block diagram of an automatic inspection system based on the automatic inspection method of the present invention.

FIG. 2 is a graph of a reference signal pattern (solid line) and a measured output signal pattern (dashed line) corresponding to a normal woven fabric having no weaving defects.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic inspection apparatus 2 Woven cloth 3 Photoelectric sensor 4 Sending means 5 Amplifier 6 Changeover switch 7 Storage device 8 Comparison judgment device 9 Memory 10 Style judgment device 11 Reference signal generator 12 Loom control device 13 Controller 14 Weaving density setting device 15 Shedding / weft insertion pattern setting device 16 Weft insertion device 17 Shedding device 18 Feeding device 19 Winding device 20 Main axis of loom 21 Encoder 22 Style designator

Claims (3)

[Claims] An optical output signal corresponding to the amount of light received is detected as a reference signal pattern, and the reference signal pattern is generated. The reference signal pattern corresponding to the weaving style of the woven fabric to be inspected is read out and stored in association with the weaving style of the normal woven fabric. Detects light that reflects the weave state of the cloth, detects the measured output signal pattern corresponding to the amount of light received, and compares the read reference signal pattern with the measured output signal pattern to determine the inspection target. An automatic inspection method comprising determining whether there is a defect in the woven fabric. 2. A storage device for storing, as a reference signal pattern, an electrical output signal corresponding to an amount of received light that reflects a normal weaving state of a normal woven fabric having no defect, in association with a normal woven fabric weaving style. The reference signal pattern corresponding to the weaving style of the woven fabric to be inspected is read from the storage device, and a reference signal generator for generating the reference signal pattern and the light reflecting the weaving state of the woven fabric to be inspected are detected. A photoelectric sensor for generating an electrical measured output signal pattern corresponding to the amount of received light, and a measured output signal pattern from the photoelectric sensor and read from the storage device by the reference signal generator. And a comparison / determination unit for comparing the reference signal pattern with the reference signal pattern to determine whether or not there is a defect in the woven fabric to be inspected. 3. The storage device according to claim 1, further comprising a style determiner that determines a weaving style of the woven fabric to be inspected from the weaving data and specifies a weaving style to be read from a memory in the storage device. Item 6. The automatic inspection device according to Item 2.