Ink jet printing apparatus

Details Ink jet printing apparatus Ink jet printing apparatus

1980-07-24

1982-11-09

Hartary, Joseph W.

Recorders

Record receiver deforming

G01D 1518, G01D 1800

Patent

active

043587755

ABSTRACT:
An ink jet is ejected from an ink jet head (1.sub.1) at a constant frequency of pressure oscillation and separates into ink droplets at a certain position. A pulsating electric field is applied to the droplets at the separation position to charge the same where it is desired to print a dot on a sheet (PR), the charged droplets being electrostatically deflected onto the sheet (PR), whereas uncharged droplets are trapped by a gutter (GA). The phase of the pressure oscillation is initially progressively shifted until a charge detector (21) detects a charged condition of the droplets and then latched at that phase. A single charging electrode (41) and a single charge detecting electrode (21) may be used for several ink jet heads (1.sub.1, 1.sub.2, 1.sub.3) if a separate phase of charging voltage is provided for each respective ink jet head (1.sub.1, 1.sub.2, 1.sub.3) and the phases are alternatingly applied. A plurality of the latter described units may be provided in a row with ink jet heads in corresponding positions all being operated with the same charging voltage phase.

REFERENCES:
patent: 3750191 (1973-07-01), Naylor
patent: 3769630 (1973-10-01), Hill
patent: 3969733 (1976-07-01), DeMoss

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