	US 12,257,836 B2
	Method for printing a plurality of drops at high speed
Jean-Marie Rolland, Romans (FR); Bénédicte Bertolami, Saint Marcel les Valence (FR); and Gabriel Leopold, Malissard (FR)
Assigned to DOVER EUROPE SÀRL, Vernier (CH)
Filed by DOVER EUROPE SÀRL, Vernier (CH)
Filed on Oct. 6, 2021, as Appl. No. 17/495,129.
Claims priority of application No. 20306193 (EP), filed on Oct. 9, 2020.
Prior Publication US 2022/0111643 A1, Apr. 14, 2022
Int. Cl. B41J 2/12 (2006.01); B41J 2/08 (2006.01); B41J 3/407 (2006.01)

CPC B41J 2/12 (2013.01) [B41J 2/08 (2013.01); B41J 3/4073 (2013.01)]

16 Claims

1. A method for forming at least one plurality of printed dots on a surface, with help of at least one plurality of drops generated by a printhead of a continuous inkjet printer comprising a drop generator, said method comprising, for each plurality of printed dots:

a) deciding, whether all drops of said at least one plurality of drops are protected from perturbations or whether at least one drop of said at least one plurality of drops is not protected from said perturbations, said deciding being based on whether said at least one plurality of drops is preceded by at least another drop to be printed or by a preceding plurality of drops to be printed from the same drop generator; said step a) being followed by:

a1) for each drop of said at least one plurality of drops, selecting charge data from at least a first set of data (DB1) of charge data for drops protected from said perturbations by preceding drops originating from the same drop generator or from at least a second set of data (DB2) of charge data for drops not protected from said perturbations by an absence of preceding drops originating from the same drop generator, depending on the result of step a);

b) generating and charging each drop of said at least one plurality of drops according to whether it is protected from said perturbations or not protected from said perturbations;

said step b) comprising generating and charging each drop of said at least one plurality of drops according to the charges selected from first set of data (DB1) or from said second set of data (DB2);

c) printing said at least one plurality of drops on said surface.

11. A continuous inkjet printer comprising:

a drop generator for forming a plurality of ink drops from a continuous jet of ink;

a controller for deciding, for each drop of said plurality of drops, whether it is protected or not from perturbations, said deciding being based on whether said at least one plurality of drops is preceded by at least another drop to be printed from the same drop generator or by a preceding plurality of drops to be printed from the same drop generator;

at least one electrode for charging said drops according to whether it is protected from said perturbations or not protected from said perturbations; and

a memory memorizing a first set of data or database (DB1) of charge data for drops protected from perturbations by preceding drops originating from the same drop generator and a second set of data or database (DB2) of charge data for drops not protected from perturbations by an absence of preceding drops originating from the same drop generator;

said controller selecting, for each drop of said plurality of drops, charge data from said first set of data or database (DB1) and/or from said second set of data (DB2);

said at least one electrode charging said drops according to the charges selected from said first set of data (DB1) and/or from said second set of data (DB2) according to whether it is protected from said perturbations or not protected from said perturbations.