DROP PLACEMENT ERROR REDUCTION IN ELECTROSTATIC PRINTER

• Main Authors: MARCUS MICHAEL A, PANCHAWAGH HRISHIKESH V, ADIGA SHASHISHEKAR P
• Format: Patent
• Language: English
• Published: 26.09.2013
• Subjects: CORRECTION OF TYPOGRAPHICAL ERRORS; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; PERFORMING OPERATIONS; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

Drop formation devices are provided with drop formation waveforms to modulate liquid jets to cause portions of the liquid jets to form print drops having a jet breakoff length Lp in a print drop breakoff length range Rp and non-print drops having a jet breakoff length Lnp in a non-print drop breakoff length range Rnp. A timing delay device shifts the timing of the waveforms supplied to drop formation devices of first and second nozzle groups so that print drops formed from first and second nozzle groups are not aligned relative to each other. A charging device includes a charge electrode that is positioned relative to the breakoff length Lp and breakoff length Lnp such that there is a difference in electric field strength at the two breakoff lengths to produce a print drop charge state on print drops and a non-print drop charge state on non-print drops.