JPH0815031A - Inspection device for color difference of continuous length - Google Patents

Abstract

PURPOSE:To selectively measure color difference such as uneven dying, listing etc., in a same continuous fabric as the color difference in a reference matter during inspecting color difference in the continuous fabric and the like. CONSTITUTION:To a device provided with a conveyor part for running a continuous length, an input part 1 for inputting inspection conditions, an output part 5 for outputting inspection conditions and inspection results, a CPU 3 for totally controlling them, a plurality of color sensors 9 connected to the CPU 3 and positioned above the continuous length and a calibration mechanism for the color sensor 9, a means 14 to select whether the color difference variation indicated in a graph exhibits a color difference in a same material or a color difference from that of a reference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a color difference of an object, and more particularly to an apparatus for inspecting a color difference of a fabric or the like mainly using a color sensor.

[0002]

2. Description of the Related Art Generally, in the process of dyeing industrial products such as cloth, film and board, for example, wool fabric or cotton fabric, color unevenness occurs due to non-uniform dispersion of dye, or partial coloring due to overheating or foreign matter mixing. Or stains that are colored brown by oil or the like. Such color unevenness, stains, etc. occur locally and suddenly, and are considered to be fatal defects in the appearance of industrial products. It is the current situation. For this reason, the labor required for the inspection is large, and the following inspection methods are conventionally known in order to rationalize the labor. (1) Scans the luminous flux of the laser beam at a high speed in a direction perpendicular to the transport direction of the product (measured object), and focuses on the point where the reflectance of the abnormal part changes from that of the normal part to detect scratches, etc. I do. (2) A television camera using an image sensor scans the surface of a product, extracts and processes an image signal, and obtains a color unevenness signal. (3) A photoelectric colorimeter (color sensor) or a spectrophotometer is arranged above or below the product conveyed at a required speed, and the color of the surface of the object is continuously measured.

[0003]

However, in the above-mentioned conventional inspection method, although it is possible to achieve a purpose for the condition corresponding to the principle, it is possible to inspect the color difference of the fabric online. Not efficient enough. That is, in the method using the luminous flux of the laser beam, since the laser beam is monochromatic light, it is possible to detect a flaw that scatters light and to attach a foreign substance, but cannot detect a color difference. In addition, the method using an image sensor uses an image analysis device and requires data processing by software, which increases the time required for detection, increases equipment costs, and causes television cameras to have insufficient color discrimination performance. Therefore, it is not possible to perform an inspection comparable to the human eye, and it is not possible to meet the required speed of the process. Furthermore, many methods and devices have been proposed for the method using a color sensor or a spectrophotometer, but if there is a color difference with the reference sample product and there is no color difference within the allowable range, then there is a color difference. Many are judged. However, for long objects such as textiles, the color difference within the same inspection object (so-called medium rare, uneven dyeing, etc. in the case of textiles) is an important inspection item as well as the color difference with reference products. There is. Simultaneously displaying both color difference variation graphs for online inspection is very efficient, but there is a drawback that the hardware required therefor is expensive and the software for realizing the same is complicated.

[0004]

In order to solve the above-mentioned problems, the present invention is an apparatus for inspecting online for color unevenness of a long object such as a fabric conveyed at a required speed. Conveying section for running a strip in a strip shape Keyboard for inputting inspection conditions, input section for inputting start / stop, display section for displaying inspection condition or result graph, output section for outputting results, and conveyance of these Section, an input section, a display section, an output section, and a plurality of color sensors located above or below the elongated object, and a long object surface between the color sensor and the elongated object. It is equipped with a calibration mechanism that automatically calibrates the color sensor with one or more calibration objects that move in parallel with the color difference variation graph displayed and output. Is it the color difference in the object? Those having a means that can selectively set.

In the color difference variation graph display, the color difference from the reference product,
Alternatively, since there is a means for setting to display either the color difference within the same inspection object, it is possible to display the color difference variation graph suitable for the object, and to obtain the information that one wants to know by the inspection instantly, and To output the color difference inspection device with improved inspection efficiency. An embodiment of the present invention will be described below with reference to FIGS.

[0006]

1 is a schematic diagram of a basic system configuration of a color difference inspection apparatus using a plurality of color sensors proposed in the present invention. The CPU, display unit, output unit, etc. of the system are, for example, a personal computer PC-9801 (N
Made by EC). As a peripheral device connected to the CPU, there is a carrying unit (driving unit), and a linear motor that moves a carrying motor for driving a long object and a driving motor for focusing a color sensor to a color measurement position to move a calibration plate. It also includes mechanical devices such as motors, anti-meander, wrinkle-rolling, tension control (neither shown).
A rotary encoder is installed on the transport roller or the transport motor shaft in order to control the color measurement timing of the plurality of color sensors. These are C
It is controlled by connecting an input / output interface board and an A / D conversion board to the input / output (I / O) terminal of the PU. The input unit is a device for inputting inspection conditions, such as a keyboard,
Bar code reader, voice input device, start / stop of transport system /
It is composed of a switch input device for instructing forward / backward movement and a switch input for selecting and inputting a color difference variation graph. A plurality of (three in FIG. 1) color sensors are installed perpendicular to the running direction of the long object. This is because, in the case of textiles and the like, the color difference between the left and right, that is, the medium rareness is accurately detected. The color sensor is connected to the CPU and controlled by a communication line such as RS-232C. The CPU is provided with a storage device of about 100 MB so that inspection conditions, data and the like can be recorded.

FIG. 2 shows an operation flowchart of the color difference inspection apparatus according to the present invention, and the details of the function will be described. First, conditions such as the product name of the object to be measured, the inspection date, and the inspection speed are input. Then, a reference value for performing the color difference inspection, that is, a reference color value is set. By setting the reference color value, the detection of the color difference with the inspection object can be calculated. Next, in order to display and output the color difference variation graph according to the inspection object, the color difference graph display with the reference product or the color difference variation graph within the same object is selected and input. In the embodiment, FIG.
It can be set with the switch. When the measurement is started, it is checked whether it is the measurement inspection length. If it is not completed, whether the colorimetric point is reached or not is recognized by counting the pulses input from the rotary encoder to measure the traveling distance. If it is a color measurement point, color measurement is performed, data is collected and displayed on the CRT. At this time, in the embodiment of the present system, a method is adopted in which a plurality of data are combined into one block of data at regular intervals for color measurement. For example, data obtained by measuring 5 points at 1 m intervals is averaged, and the averaged colorimetric value is used as a representative point of 4-5 m after running. By doing this, in the case of a long object such as a woven fabric, data is actually taken in fine detail, and the necessary and sufficient number of data can be displayed, and the data can be compressed and recorded. There is also a merit to say.

FIG. 3 and FIG. 4 show two kinds of color difference variation graphs. FIG. 3 shows an output example of a color difference variation graph with respect to a reference product, which is called anti-color difference variation in the case of a fabric or the like. The horizontal axis shows the length (m) of the fabric to be inspected,
The vertical axis ΔE is the color difference value from the color value of the reference product. As in this embodiment, the colorimetric data of the three color sensors are recorded at regular intervals, and the color difference from the reference product can be discriminated at a glance at each measurement point. On the other hand, in the case of textiles,
Depending on the destination and application, for example, it is important that shirt cloth and the like have no color difference unevenness within the same piece of cloth, so it is desirable to display or output this color difference variation graph. FIG. 4 shows an example of the output, but in this embodiment, a method using the Lab color system will be described. The L axis of this color system represents the magnitude of lightness (shade), and the a and b axes represent the degree of hue. The data obtained as the colorimetric value of the color sensor is a pair of these three types, and the variation graph for each is shown. Therefore, it is possible to know at which point in the piece of cloth the change in brightness is large based on the data change of only the L axis of the three color sensors. Similarly for the a and b axes,
The hue change in the cloth can be read instantly.
As the color difference variation graph within the inspection object, for example, a color difference variation graph with each measurement point based on the colorimetric value at the beginning of the cloth is also conceivable. When the inspection length comes and the measurement ends, the conveyance power is turned off, the results are totaled, and the color difference variation graph is printed out.

[0009]

As described above, according to the present invention, when performing a color difference inspection of a long object such as a woven fabric, the color difference inspection of a long object such as a woven fabric is performed according to the inspection content of the object. Therefore, it is possible to selectively set the display of the color difference variation graph to the color difference from the reference product or the color difference within the same inspection object, and the color difference you want to obtain in real time (such as uneven dyeing or medium rare) ) It has become possible to use it as an efficient long object color difference inspection device that can obtain inspection results.

[Brief description of drawings]

FIG. 1 shows a schematic diagram of a basic system configuration of a color difference inspection apparatus according to the present invention.

FIG. 2 is an operation flowchart of an online color difference inspection device using a color sensor.

FIG. 3 is an output example of a color difference variation graph (color difference variation with a reference color value)

FIG. 4 is an output example of a color difference variation graph (color difference variation within the same inspection object).

[Explanation of symbols]

1: Input unit, 2: Keyboard, 3: CPU, 4: Display unit, 5: Output unit, 6: Linear motor, 7: Reference cloth calibration plate, 8: White calibration plate, 9: Color sensor, 10: Guide rail , 11: fabric, 12: X-axis stage, 13: graph selection input section, 14: rotary encoder

Claims (1)

[Claims] 1. A transport unit for running a long object in a strip shape, an input unit for inputting inspection conditions, a display unit for displaying inspection conditions and results, and an output unit for outputting the results, and a CPU for overall control of these, A plurality of color sensors connected to the CPU and positioned above or below the long object, and one or more calibration objects moving between the color sensor and the long object in parallel with the surface of the long object, A means for selecting a graph display of a color difference variation of an inspection long object with respect to a reference sample product or a color difference variation graph only within the same inspection long object, in a color difference inspection device including a calibration mechanism section for calibrating a color sensor. A long object color difference inspection device characterized by comprising.