On-line automatic controlsystem for printing quality

Abstract

The on-line automatic printing quality control system includes image acquiring unit, image processing unit, ink conveying unit and paper transferring unit. The image acquiring unit includes area array CCD camera set below the paper transferring unit and linear array CCD camera set beside the printing cylinder; and the ink conveying unit has CPC local ink color regulating mechanism and ink roller regulating mechanism. The image information the image acquiring unit acquires is compared in the image processing unit with the stored standard sheet image, and the comparison result is used as control signal fed to the ink conveying unit for ink regulation. The present invention realizes the on-line automatic printing quality control via the combination of integral ink conveyance and local ink conveyance.

Description

technical field [0001] The invention relates to an on-line automatic control system of printing quality applied to a printing machine. Background technique [0002] At present, the color mark inspection method is generally used for the detection of the printing quality of the printing machine, that is, the color mark is printed on one side of the printed matter, and the purpose of checking the printing quality of the entire printed matter is achieved by checking the quality of the color mark. Since the color code is relied on to reflect the printing quality within the entire width of the printed product, this method is only applicable to the overall ink supply of the printing cylinder. When the ink transfer device supplies ink to the printing cylinder in the form of regional ink transfer, it cannot Use this method to check the printing quality of printed matter. In addition, the above-mentioned printing quality inspection method is an after-the-fact inspection, that is, onl...

AI Technical Summary

Problems solved by technology

Since the color code is relied on to reflect the printing quality within the entire width of the printed product, this method is only applicable to the overall ink supply of the printing cylinder. When the ink transfer device supplies ink to the printing cylinder in the form of regional ink transfer, it cannot Use this method to check the printing quality of printed matter

In addition, the above-mentioned printing quality inspection method is an after-the-fact inspection, that is, only the printed products after printing can be inspected. Therefore, once a printing quality problem occurs, it means that a batch of printed products will be scrapped.

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