Method and apparatus for continuous ink jet printing

B - Operations – Transporting – 41 – J

Patent

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B41J 2/025 (2006.01)

Patent

CA 2199725

An apparatus and method for producing a stream of ink drops in a continuous ink jet printer (20) having a maximum allowable number of fast satellite drops. An ink, which may be a hot-melt ink in its liquid phase, is pressurized for continuous flow to a nozzle (26) and a rectangular or triangular waveform is generated at a fixed frequency. The waveform is applied to a transducer (30) coupled to the nozzle (26) such that nozzle vibrates and the ink flow is perturbed and discharged from the nozzle as primary drops with satellite drops formed therewith. The harmonic content of the rectangular or triangular waveform is adjusted until the desired number of fast satellite drops suitable for desired image formation are formed in the stream of primary drops. In a preferred embodiment, the desired number of fast satellites is a maximum of three.

Dispositif et procédé permettant de produire un flux de gouttelettes d'encre dans une imprimante à jet d'encre continu (20) possédant un nombre tolérable maximum de gouttes satellites rapides. Une encre, éventuellement, une encre thermofusible dans sa phase liquide, est mise sous pression, de sorte qu'elle s'écoule en continu vers une buse (26) et une onde rectangulaire ou triangulaire est générée à une fréquence fixe. L'onde est appliquée sur un transducteur (30) couplé à la buse (26), de façon à faire vibrer la buse, à perturber l'écoulement d'encre et à l'évacuer par la buse sous forme de gouttes primaires comportant des gouttes satellites. La teneur en harmoniques de l'onde rectangulaire ou triangulaire est réglée jusqu'à l'obtention dans le flux de gouttes primaires, du nombre voulu de gouttes satellites rapides permettant de réaliser l'image souhaitée. Dans un mode de réalisation préféré, le nombre souhaité de satellites rapides est de trois maximum.

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