Method and apparatus for operating high speed ink jet printers

(19)

(11)

EP 0 639 459 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	16.10.1996 Bulletin 1996/42

(43)	Date of publication A2:
	22.02.1995 Bulletin 1995/08

(21)	Application number: 94305480.9

(22)	Date of filing: 25.07.1994

(51)	International Patent Classification (IPC)⁶: B41J 2/075

(84)	Designated Contracting States:
	DE FR GB

(30)

Priority:

17.08.1993 US 107934

(71)	Applicant: SCITEX DIGITAL PRINTING, Inc.
	Dayton, Ohio 45420-4099 (US)

(72)	Inventor:
	Bitticker, William R. Centerville, Ohio 45458 (US)

(74)	Representative: Hillier, Peter et al
	Reginald W. Barker & Co., Chancery House, 53-64, Chancery Lane London, WC2A 1QU London, WC2A 1QU (GB)

(54)	Method and apparatus for operating high speed ink jet printers

(57) A continuous multi-jet ink jet printer improves print quality in a high speed printer. The continuous multi-jet ink jet printer includes means for producing a rectangular array of ink drops, the array having columns corresponding to the consecutive drops in a single jet, and rows corresponding to drops simultaneously produced from all of the jets, where print drops and partially charged drops are printed on a print media and fully charged drops are deflected from the print media. Print quality is improved by selecting one or more print drops for printing and subjecting each of the one or more print drops to an equal amount of partial charging.

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