Ink droplet falling-point control method in ink jet printing

Abstract

The invention relates to a method for controlling and compensating an ink dropping point in an inkjet printer. The method at least comprises: a step 101, in which according to the moving speed of a word car, the jetting speed of a nozzle in the self-motion of ink drops and the distance between the nozzle and a printing medium, a graph 2 is referred and Newton's laws of kinematics is used as basis to list an equation set of horizontal projectile motion; the time ts needed for early injection is calculated; a step 102, in which according to ts, sampling time T of Kalman filtering wave is determined; according to the moving speed of a uniform speed section of the word car and the ts in the step 101, a speed curve of the word car is divided so that the sampling time of the Kalman filtering wave is more than the time of early injection; a step 103, in which according to the determined initial value of the Kalman filtering wave and the observed displacement value of the word car, one-step prediction is carried out to obtain the state variable of next time; and a step 104, in which the predicted speed value in the step 103 is utilized to carry out calculation of relevant controlled quantity; and the step returned to the step 103 for iterative prediction. The method can compensate for errors of the ink dropping point, has good precision of prediction, broadens the printing area and improves printing efficiency.

Description

technical field [0001] The invention belongs to the technical field of inkjet printing, in particular to a method for controlling and compensating the falling point of ink droplets in a wide-format inkjet printer, which is used to compensate the falling point error caused by the movement of the character carriage, so as to improve the printing speed and quality . Background technique [0002] Serial inkjet printing is widely used in inkjet printers and plotters, and it is realized by controlling the horizontal scanning printing and longitudinal paper feeding of the inkjet head. Specifically, the inkjet head prints one or more columns (hundreds to thousands) of dots each time, and at the same time, driven by the character carriage, the inkjet head performs a horizontal scanning movement to form a row of dots. At this time, the paper feeding motor drives the paper to perform a new line operation to print the next line of dots, forming an image again and again. [0003] With ...

AI Technical Summary

Problems solved by technology

However, the above method has great limitations. First, it adopts the method of point-by-point prediction of the speed of the spray point, which limits the movement speed of the character cart; second, it cannot continue to improve the printing resolution; third, the LMS algorithm predicts The accuracy of the speed is lacking; the fourth is that it can only print in the uniform speed area, but it is powerless in the acceleration and deceleration area

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