Abstract: A method of authenticating a consumable or detachable element of a continuous inkjet printer, (CIJ), comprising: the controller of the printer generating and dispatching a 1st item of random information to an authentication circuit of the element; encrypting the 1st item of random information by the authentication circuit using a 1st encryption algorithm and a 1st secret key to form a 1st item of encrypted random information; dispatching the 1st item of encrypted random information to the controller; encrypting the 1st item of random information by the controller using a 2nd encryption algorithm and a 2nd secret key to form a 2nd item of encrypted random information; and comparing the 1st item of encrypted random information with the 2nd encrypted item of random information. If the consumable element is authenticated, a shared key part of a 3rd key is dispatched by the consumable or detachable element to the CIJ.

Abstract: A printing control method of a multi-nozzle binary continuous ink jet printer wherein drops of a first category and drops of a second category are formed by jet breaking. The flowpaths followed by the drops of the first and second categories are differentiated. For printing a black pixel followed by a white pixel, a drop of the first category and a drop of the second category are formed. The cumulative formation time drops of the first and second categories is equal to or higher than the running time of one pixel.

Abstract: The invention relates to a new control method for controlling the printing of a binary continuous inkjet printer provided with a printhead (20) with a set of deflection electrodes (8a, 8b; 9a, 9b) shared by all of the nozzles of the head, at least one pair of electrodes (8, 9) supplied in phase opposition relative to each other, and actuators (6) to which pulses are sent to form a distance Lbr from the plane of the nozzles (11), from the break of a jet discharged by a nozzle (3) in communication with a stimulation chamber (2) to which said actuator is mechanically coupled, drops not able to be electrically charged or jet segment subjected to the electrostatic influence of the deflection electrodes. According to the invention, the pulses are controlled so as to minimize the total electrical charge taken on by the ink jet segments inside a volume of influence of the electrodes.

Abstract: A printing control method of a multi-nozzle binary continuous ink jet printer wherein drops of a first category and drops of a second category are formed by jet breaking The flowpaths followed by the drops of the first and second categories are differentiated. For printing a black pixel followed by a white pixel, a drop of the first category and a drop of the second category are formed. The cumulative formation time drops of the first and second categories is equal to or higher than the running time of one pixel.