Apparatus and method for flushing ink-jet recording heads withou

Details Apparatus and method for flushing ink-jet recording heads withou Apparatus and method for flushing ink-jet recording heads withou

1997-02-13

1999-05-11

Le, N.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 23, 347 35, B41J2/165

Patent

active

059032880

ABSTRACT:
An ink-jet recording device which carries out flushing of the nozzle holes of color-ink recording heads without suspending the printing operation. When flushing of the color-ink nozzle holes is required, the device determines, using bit-map data, whether or not black ink dots are to be printed in nearby locations that correspond to the nozzle holes requiring flushing. If so, flushing is effected by discharging color-ink drops in the locations where black-ink dots are to be formed. Subsequently, the black-ink dots that are larger than the color-ink dots are superposed over the color-ink dots, thereby concealing the color-ink dots. Alternatively, flushing of the nozzle holes of the color-ink recording heads is effected by discharging each of three colors at a location where a black-ink dot is to be formed, thereby forming a composite black dot and obviating the necessity to superpose a black-ink dot.

REFERENCES:
patent: 4785750 (1988-11-01), Best
patent: 5177505 (1993-01-01), Sugiura et al.

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