| 主权项 |
1. A printing control method for a multi-nozzle binary continuous ink-jet printer or print head of such a printer for printing a pattern on a printing medium moving with respect to the head, the method comprising:
providing a head comprising
a multi-nozzle drop generator includinga body includingone or more pressurised chambers each able to receive ink under pressure,ejecting nozzles in hydraulic communication with a pressurised chamber and each able to eject an ink jet having a rate Vj along a longitudinal axis (A) thereof, the ejecting nozzles being aligned along an aligning axis and arranged on a same plane,a plurality of actuators configured to cause, on pulse order, breaking of a jet ejected from a nozzle to form a succession of drops, the medium having with respect to the head, a rate Vs, the distance between consecutive pixels in the direction of movement of the medium being Dii; forming drops of a first category and drops of a second category by jet breaking, the drops of the first category each having a first volume, all the first volumes being substantially equal, the drops of the second category having second volumes not necessarily equal but all the drops of the second category having a volume which is not equal to the volume of a drop of the first category; differentiating the flowpaths followed by the drops of the first and second categories by applying to at least one of the drop categories a deflection force able to differentiate the flowpaths of drops of the first category and drops of the second category, the flowpath of drops of the first category intersecting the printing medium and the flowpath of drops of the second category intersecting a gutter for recovering such drops; creating a piece of information relating to moments where consecutive pixels to be printed run in a position where they are likely to be printed; and for printing each black pixel of the pattern which is followed by a white pixel of the pattern, forming one single drop of the first category and one single drop of the second category, wherein a time for forming one of said drops is less than a running time of one pixel and a cumulative time for forming said single drops of the first and second categories is equal to or higher than a running time of one pixel. |
