Importance

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Abstract

The method for synchronizing the plurality of piezoelectric crystals on a corresponding plurality of ink jet printheads comprises the steps of: (a) coupling the plurality of printheads together in a daisy-chain configuration, (b) embedding a first clock signal in data; (c) transmitting the data to the printheads on the daisy-chain; (d) each of the printheads receiving the data; (e) each of the printheads deriving a second clock signal from the data received, which is directly proportional to the first clock signal; and (f) each of the printheads driving its corresponding piezoelectric crystal with the second clock signal. Accordingly, all of the piezoelectric crystal clock sources will be synchronized in frequency with each other, eliminating beat frequency drift errors between the printheads. Preferably, the method also includes the steps of: (i) determining the time it will take for the data to propagate to each of the printheads; and (ii) adjusting the phase of the second clock signal to reflect the propagation measurement. Accordingly, all of the piezoelectric crystal clock sources will also be synchronized in phase as well as frequency to each other.

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First Claim