Method and apparatus for reducing influences of sleeving alignment errors

Abstract

The invention provides a method for reducing influences of sleeving alignment errors. The method comprises the following steps: 1), obtaining the theoretical period value of a theoretical coding pulse signal sequence corresponding to any one sub-nozzle among two sub-nozzles, acquiring an actual coding pulse signal sequence corresponding to the sub-nozzle, and obtaining each actual period value of the actual coding pulse signal sequence; 2), according to the theoretical period value of the theoretical coding pulse signal sequence corresponding to the sub-nozzle, generating a white noise sequence; 3), respectively superposing each white noise in the white noise sequence to each actual period value of the actual coding pulse signal sequence so as to generate a coding pulse signal sequence after adjustment; and 4), according to the adjusted coding pulse signal sequence, controlling the printing time of the sub-nozzle so as to reduce the influences of the sleeving alignment errors of the two sub-nozzles. The invention correspondingly provides an apparatus for reducing the influences of sleeving alignment errors. According to the invention, the influences exerted by sleeving alignment errors existing in a conventional ink-jet digital printing device to human eyes can be reduced.

Description

technical field [0001] The invention relates to the technical field of digital printing, in particular to a method and a device for reducing the influence of registration errors. Background technique [0002] Inkjet digital printing is a printing technology that has developed rapidly in recent years. It directly processes the original data and then performs inkjet to achieve the purpose of printing. For the single-pass printing method (the printing method that completes printing with one pass of paper), the position of the nozzle module is fixed, and the substrate (such as paper) is driven by the mechanical platform and moves relative to the nozzle module. When the substrate reaches the predetermined position, the nozzle module sprays mist ink droplets to the substrate under the control of the control system, thereby forming an image on the substrate. [0003] Such as figure 1 As shown, the existing single-pass printing inkjet digital printing equipment contains a total of...

AI Technical Summary

Problems solved by technology

However, in actual work, due to various factors such as the paper tension of the mechanical platform and the error of the paper movement distance collected by the encoder, there is an alignment error in the position of the pattern printed by the sub-nozzle 1011 and the sub-nozzle 1012 on the paper when the paper is moving, that is, When the paper is fed, the distance between the print patterns of the sub-nozzle 1011 and the sub-nozzle 1012 is not equal, such as image 3 As shown in b, the alignment error is: Δd i =D i -d, i take 1-6 in turn, d i is the actual spacing, d is the theoretical spacing, then the alignment error Δd i The value of fluctuates around 0 and changes in a certain way. The specific registration error curve is related to the characteristics of the mechanical platform, so that there are pattern defects on the printed proofs. Although the hollow dots printed by the sub-nozzle 1011 and the solid dots printed by the sub-nozzle 1012 They only occupy the width of one line, but the human eye is more sensitive to regularly changing pattern defects, so the visual effect of the printed pattern is poor

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