Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1984-07-26
1985-12-31
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
346 75, G01D 1516
Patent
active
045624453
ABSTRACT:
A circuit and related method are provided for driving an ink jet printer to achieve a consistent velocity of ejected ink drop despite differences in the time elapsing between successive drops. Timing pulses timing the ejection of drops each trigger the production of a fundamental waveform. This waveform is then multiplied by a multiplying factor selected from a look-up table in response to the time elapsing between the timing pulse causing the generation of the waveform and the preceding timing pulse, and the modified waveform so produced is used to drive the printing head through a power amplifier. The multiplying factor is one chosen by experiment as that required to produce the desired ink jet velocity. In a preferred embodiment both the fundamental waveform and the multiplying factor may each be obtained through the use of an associated PROM so that the waveform shape and multiplying factor versus dot frequency characteristic may be readily changed to suit the particular printer head in question.
REFERENCES:
patent: 4072958 (1978-02-01), Hayami
patent: 4312007 (1982-01-01), Winfield
patent: 4499479 (1985-02-01), Lee
Hartary Joseph W.
Metromedia, Inc.
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