Cross printing method for CIJ ink-jet printer

[0019] The cross printing method of CIJ inkjet printer disclosed in the present invention includes the following steps:

[0020] S1: Generate control data according to the graphic data to be printed, and send the control data to the print head. The control data includes the number of charged ink drops and the charge amount of each ink drop;

[0021] S2: The nozzle of the print head ejects ink droplets at a high speed, and the charging electrode selects ink droplets for charging. Each character matrix is ​​composed of several columns of ink droplets. In each column of the ink droplet constituting the character matrix, there is a band between two ink droplets that are sequentially charged. The power difference is n Δq, n≥2, where one Δq is the power difference between the two nearest ink dots on the printed matter;

[0022] S3: Since the electric power carried by the two ink droplets passing by in the deflection electric field differs by n (n≥2) Δq, there is at least one ink dot between the ink dots successively printed on the printed matter in a row of ink droplets, In the end, each column of ink droplets is cross-printed on the printed matter after passing the deflection electric field to form a column of ink dots.

[0023] See figure 1 Take a row of 7 ink dots as an example. Ink droplets 1-7 are ejected from nozzle 10 in turn, passing through the charging electrode 20 to wash up the corresponding amount of electricity. There is a difference of 3 Δq between ink drop 1 and ink drop 2, and ink drop 2 There is a difference of 3 Δq between ink and 3, a difference of 5 Δq between ink droplets 3 and 4, a difference of 3 Δq between ink droplets 4 and 5, and a difference of 2 Δq between ink droplets 5 and 6, ink droplets 6 and 7 There is a difference of 3 Δq between them. When the ink droplets 1, 2, 3, 4, 5, 6, and 7 pass through the deflection electric field 30 in turn, the deflection angles differ greatly, and the distances are also far apart. The repulsion between adjacent ink droplets 1 The force is small, and the final printing will form a column of ink dots 1-7 on the printed matter 40. There are ink droplets 4 and 6 between ink droplets 1 and 2, and 5 and 7 between ink droplets 2 and 3. Due to the reduced repulsive force, the ink dots 1-7 can be printed on the printing material 40 more accurately, and the final graphic characters are of course corrected, and the clarity of the writing is effectively improved; figure 2 Shown is a row of 9 ink droplets, with multiple ink droplets spaced between two consecutive ink droplets to achieve the same printing effect. Of course, a column of ink drops is not limited to 7 or 9 ink dots. For large-size characters, the number of ink drops in a column is quite large. The advantages of cross printing are also more obvious when large characters are printed at high speed.

[0024] By changing the charge control of the ink droplets, the present invention increases the power difference between adjacent ink droplets, and at the same time increases the displacement of two adjacent ink dots, thereby reducing the size and action time of the Coulomb force (mutual repulsion) between them. Reduce its impact on the original deflection trajectory, thereby improving the accuracy of ink drop deflection, making the position of each column of ink dots printed on the printed matter more accurate, realizing the improvement of printing accuracy and quality, and avoiding blurred images and texts during high-speed printing. The problem of character confusion.

[0025] The above are only specific embodiments of the present invention and do not limit the protection scope of the present invention. All equivalent changes made according to the design ideas of this case fall into the scope of protection of this case.