JPH06129996A - Woven fabric inspection device - Google Patents

Abstract

PURPOSE:To prevent the erroneous recognition of a woven fabric by providing a destaticizer, air blower, woven fabric smoothing mechanism, re-wrinkling preventing mechanism, and fabric movement preventing mechanism. CONSTITUTION:A woven fabric 1 is carried on rolls 11, 12, and 13 and an AC corona discharge type destaticizer 14 destaticizes the surface of the fabric 1 and extraneous matters adhering to the surface of the fabric 1 are blown away with compressed air from an air blower 16. Another AC corona discharge type destaticizer 15 destaticizes the rear surface of the fabric 1 and extraneous matters adhering to the rear surface are blown away by means of another air blower 17. A smoothing roll 21 smoothes the fabric 1 and a heat roll 22 performs heat setting so as to prevent the regeneration of wrinkles. A movement preventing plate 33 is positioned on an image pickup system 40 side of tangents to intermediate rolls 31 and 32 and the fabric 1 is carried along the plate 33 while the fabric 1 is brought into contact with the plate 33. Then the fabric 1 is irradiated with light from a lamp 42 and the image of reflected light from the fabric 1 is picked up with a line sensor camera 41. Since wrinkles and extraneous matters adhering to the fabric 1, such as dust, waste thread, etc., are removed, the defect detecting performance of this woven fabric inspection device can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a woven fabric inspection device for inspecting the appearance of a woven fabric.

[0002]

2. Description of the Related Art Inspection of woven cloth is generally performed immediately before the shipment of the woven cloth. In this case, an inspector visually inspects the appearance of the woven fabric while transporting the woven fabric on the inspection table. In the visual inspection by humans, the judgment of pass / fail may differ depending on the inspector, and thus an automatic inspection device has been recently developed.

A typical example of an automatic inspection device is shown in FIG. In FIG. 4, the woven fabric 1 travels in the arrow direction by the two intermediate rolls 50 and 51. The image of the woven cloth obtained as the reflected light of the illumination 54 is captured by the line sensor camera 52. Based on this woven fabric image, the line sensor camera 5
A first image processing device (not shown) connected to No. 2 performs a rough inspection on the woven fabric. The rough inspection only determines the presence / absence of a defect. When the rough inspection determines that there is a defect, the conveyance speed of the woven fabric is switched to a low speed, and the ITV is restarted.
The reflected light of the illumination 55 is imaged by the camera 53. I
The second image processing apparatus performs a precision inspection for identifying a plurality of types of defect contents based on the image acquired by the TV camera 53. As a detailed inspection, the contents of defects are identified.

[0004]

However, the visual inspection of humans has a problem in that the inspection accuracy varies among individual inspectors. On the other hand, since the automatic inspection device has too good inspection accuracy, it may be erroneously recognized as having a defect by being affected by a slight change in the reflected light of the woven cloth.

Therefore, in view of the above points, an object of the present invention is to provide an inspecting device capable of preventing the false detection of the inspecting device.

[0006]

In order to achieve the above-mentioned object, the invention of claim 1 takes an image of the conveyed woven fabric with an image pickup device, and based on the image pickup result, the outer appearance of the woven fabric is obtained. A woven fabric inspection device for inspecting is characterized by comprising a static eliminator for eliminating static electricity on the woven fabric before the woven fabric passes through an imaging position of the imaging device.

According to a second aspect of the present invention, in a woven fabric inspection device that images a conveyed woven fabric by an image pickup device and performs an appearance inspection of the woven fabric based on the image pickup result, the woven fabric is the An air blowing device for blowing air to the woven cloth before passing through the image pickup position of the image pickup device is provided.

According to a third aspect of the present invention, in the woven fabric inspection device, the woven fabric to be conveyed is imaged by an image pickup device, and the appearance of the woven fabric is inspected based on the image pickup result. It is characterized in that a mechanism is provided for extending the wrinkles of the woven cloth before passing through the image pickup position of the image pickup device.

The invention of claim 4 is characterized in that, in addition to the invention of claim 3, a mechanism for preventing the re-creation of the wrinkles is provided until an image is taken by the imaging device.

According to a fifth aspect of the present invention, in the woven fabric inspection device, the woven fabric to be conveyed is imaged by an image pickup device, and the appearance of the woven fabric is inspected based on the image pickup result. It is characterized in that it has a fluctuation preventing mechanism that allows fluctuation of the woven fabric only in the conveying direction while passing through the image pickup position of the image pickup device.

[0011]

According to the first to fifth aspects of the present invention, external influences such as static electricity, adhering substances, and wrinkles of the woven fabric, which cause the false recognition, are eliminated.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a main structure of a woven fabric carrying section of a tester according to an embodiment of the present invention. In FIG. 1, the conveyance unit of the inspection device includes a charge removal / adhesion removal unit 10, a wrinkle extension / heat setting unit 20, a fluctuation prevention unit 30, and an imaging system 40.

The static eliminator / adhesion remover 10 comprises metal rolls 11, 12, 13 and AC corona discharge type static eliminators 14, 15
And air blowing devices 16 and 17.
The woven fabric 1 is conveyed along the rolls 11, 12, and 13. First, the AC corona discharge type static eliminator 14 performs static elimination on the surface between the rolls 11 and 12, and removes the deposits attached to the woven fabric 1 with an air blowing device 16 To blow off with air pressure. Then roll 1
Between the Nos. 2 and 13, the back surface of the woven fabric is destaticized by the AC corona discharge type static eliminator 15 and the attached matter is removed by the air blowing device 17.

The wrinkle extending / heat setting section 20 is shown in FIG.
There are spiral grooves with different directions from the center of the roll to the left and right, and the wrinkle roll 21 that stretches the woven fabric to the left and right as the roll rotates and the cylindrical metal as shown in FIG. The roll 23 includes a heat roll 22 for heat setting in the longitudinal direction, for example, a long halogen light source 24 as a heat source.
The wrinkles are extended with and heat set by the heat roll 22 so that the wrinkles are less likely to be generated again.

The fluctuation prevention unit 30 which allows fluctuations only in the conveying direction of the woven cloth 1 is composed of intermediate rolls 31 and 32 and a fluctuation prevention plate 33 installed between the rolls. Fluctuation prevention plate 3
The woven cloth 1 is installed so that the position 3 is closer to the imaging system 40 than the tangent line contacting the surfaces of the two intermediate rolls 31 and 32.
Are brought into contact with the fluctuation prevention plate 33 and conveyed along.

The woven cloth 1 on the fluctuation prevention plate 33 is illuminated 4
2. The reflected light is imaged by the combination of the line sensor camera 41. The material of the fluctuation prevention plate 33 may be resin, metal, or wood, but the color of the surface in contact with the woven cloth 1 facilitates the inspection of the woven cloth. Use a white board. In the case of woven fabric of colored objects, the line sensor camera 4
When 1 corresponds to color, the color of the variation prevention plate 33 may be a complementary color of woven cloth. When the line sensor camera 41 supports black and white, the color of the variation prevention plate 33 is selected to be white or black, which is easy to inspect. When imaging transmitted light, the fluctuation prevention plate 33 may be glass, transparent resin, or opalescent resin plate. The edge portion of the fluctuation prevention plate 33 is preferably chamfered so as not to damage the woven fabric 1.

In addition, in the static eliminator / adhesion remover 10, both front and back surfaces are processed. However, when only the front surface is required, the back surface processing may be omitted. It is also possible to form the wrinkle-rolling roll 21 in common with the roll 13 and use only the wrinkle-rolling roll 21. Similarly, the heat roll 22 and the intermediate roll 31 may be shared and the intermediate roll 31 may be eliminated.

The above-described operation control of the charge removal / adhesion removal unit 10, the AC corona discharge type charge removers 14, 15, the air blowing device, and the heat roll 22 may be executed by individual controllers, or by one controller. Centralized control may be performed by a sequence controller or the like. However, when performing visual inspection of multiple types of woven fabrics, the operating conditions of the above-described components are determined for each type of woven fabric, the operating conditions are stored in the sequence controller, and the type of woven fabric from the user is determined. If the sequence controller variably sets the operating conditions of the above-mentioned components in accordance with the instruction, a more suitable imaging environment can be obtained.

[0020]

As described above, according to the present invention, since wrinkles, dust, lint, and other woven fabric deposits that cause erroneous recognition are removed, the defect detection performance of the inspection device is improved. improves.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an inspection device according to an embodiment of the present invention.

FIG. 2 is a front view showing an example of a roll for extending wrinkles.

FIG. 3 is a perspective view showing an example of a heat roll.

FIG. 4 is a schematic cross-sectional view showing the structure of a conventional automatic inspection device.

[Explanation of symbols]

 1 Woven cloth 10 Static eliminator / adhesion remover 11, 12, 13 Metal roll 14, 15 AC corona discharge static eliminator 16, 17 Air blowing device 20 Wrinkle roll / heat set unit 21 Wrinkle roll 22 Heat roll 30 Fluctuation prevention unit 31, 32 Intermediate roll 33 Fluctuation prevention plate 40 Imaging system 41 Line sensor camera 42 Illumination

Claims (5)

[Claims] 1. In a woven cloth inspection device, wherein an image of a conveyed woven fabric is picked up by an image pickup device, and the appearance of the woven fabric is inspected based on the picked-up result, the woven cloth is at an image pickup position of the image pickup device. A fabric inspection device, comprising a static eliminator for eliminating static electricity from the woven fabric before passing through the fabric. 2. In a woven fabric inspection device that images a conveyed woven fabric by an image pickup device and inspects the appearance of the woven fabric based on the image pickup result, the woven fabric is at an image pickup position of the image pickup device. A fabric inspection device, comprising an air blowing device for blowing air to the woven fabric before passing through the fabric. 3. A woven fabric inspection device that images a conveyed woven fabric by an image pickup device and inspects the appearance of the woven fabric based on the image pickup result, wherein the woven fabric is at an image pickup position of the image pickup device. A woven fabric inspection device comprising a mechanism for unfolding the wrinkles of the woven fabric before passing through the fabric. 4. The woven fabric inspection device according to claim 3, further comprising a mechanism for preventing the re-creation of the wrinkles until an image is taken by the imaging device. 5. In a woven fabric inspection device, which picks up an image of a conveyed woven fabric by an image pickup device and inspects the appearance of the woven fabric based on the image pickup result, the woven fabric is at an image pickup position of the image pickup device. A woven fabric inspection device, which is provided with a variation preventing mechanism that allows variation of the woven fabric only in the conveying direction while passing through the fabric.