Method and apparatus for controlling satellites in an ink...

Details Method and apparatus for controlling satellites in an ink... Method and apparatus for controlling satellites in an ink...

B - Operations, Transporting

41

J

222/1, 101/96.02

B41J 2/12 (2006.01)

Patent

CA 1056439

METHOD AND APPARATUS FOR CONTROLLING SATELLITES IN AN INK JET PRINTING SYSTEM ABSTRACT OF THE DISCLOSURE A continuous jet stream of a ferrofluid ink is broken into individual drops by an asymmetrical perturbation force applied to the stream. The ink, as it exits from an orifice under pressure, is excited by an electro- magnetic transducer energized with an asymmetrical excitation signal having a fundamental and higher harmonics. An asymmetrical excitation signal, such as a sawtooth, having a substantial second and/or third harmonics content which produce an excitation signal with different rise and fall times can form a stream of drops free of satellites. Asymmetry of magnetic field forces can be produced with single stage or multi-stage transducers located at spaced positions along the stream. Asymmetry can also be produced using an electromagnetic transducer having a non-uniform gap.

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