Ink jet printers and methods

Details Ink jet printers and methods Ink jet printers and methods

2006-09-12

2006-09-12

Hsieh, Shih-Wen (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S019000

Reexamination Certificate

active

07104634

ABSTRACT:
A method and apparatus for printing a desired pattern on a substrate by discharging continuous streams of liquid ink drops from nozzles towards the substrate, and selectively charging the liquid ink drops with multi-level charges deflecting them different amounts. Some of the liquid ink drops are thus directed to different locations on the substrate for printing the desired pattern thereon, while other liquid ink drops not to be printed are intercepted by a gutter before reaching the substrate. At least some of the liquid ink drops to be printed being either uncharged or charged with a multi-level charge of one polarity, while all the liquid ink drops not to be printed are charged with a charge of the opposite polarity. Each stream of ink drops discharged from a nozzle is illuminated with stroboscopic light at the same frequency as the drop formation, and the illuminated stream is optically sensed on the fly for determining various conditions, including ink velocity, X-axis offset and Y-axis offset.

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Nguyen et al. “Determining Ink Drop Velocity in an Ink Jet Printer by Stroboscopic Method” IBM Technical Disclosure Bulletin 21 (11): 4593-4594, 1979. Abstract.

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