METHOD AND APPARATUS FOR CONTINUOUS INK JET PRINTING

摘要

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.