System and method for detecting front and back face qualities of imprinted Renminbi (RMB) large-page product

Abstract

The invention relates to a system and method for detecting front and back face qualities of an imprinted Renminbi (RMB) large-page product. The method comprises the following steps of: arranging a front face detecting unit and a back face detecting unit on a paper collecting part of an imprinter respectively; and transmitting a pulse signal by using an encoder which is synchronous to a system detection drum to trigger a colored linear array CCD (Charge Coupled Device) camera to acquire an image, wherein the reduction in the detection capability of the system, caused by paper fluctuation, can be reduced to the maximum extent by using a flattening device. By adopting the system and method, products with severe quality problems caused by an imprinting procedure per se and a series of products with continuous remarkable quality problems (such as paper holes, break angles, oil stains, number strike-through and the like) can be intercepted, and products with remarkable and severe quality problems in an offset printing procedure and a gravure procedure can be controlled according to a detection result, better technical supplements are provided for the conventional running computer retrieval process, and the front and back face qualities of the important imprinted RMB product can be checked, scraps can be positioned accurately, and the delivery quality safety of the product is ensured.

Description

technical field [0001] The invention relates to a RMB printing quality detection system and detection method. technical background [0002] The printing quality of the front and back of the existing RMB large-sheet products needs to be inspected after printing, but the existing code printing process only uses local area quality inspection, which cannot realize the quality inspection of the full face, and at the same time, it cannot be single-issued for the detected quality defects. position. If the single-opening and number-based positioning is realized on the existing basis, it is necessary to separately install a large-sheet coding device after the printing machine and perform number conversion to locate defective products, otherwise the work of accurately locating the small openings of waste products cannot be completed. . However, the recognition speed of the large-sheet inkjet coding device cannot meet the speed requirements of the printer, and its recognition accurac...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems that the existing RMB large-sheet products cannot accurately locate the small openings of waste products, and the machine inspection capability of small-denomination products is insufficient, the present invention proposes a quality detection system and detection method for the front and back face of RMB large-sheet products after coding

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