(19)
(11) EP 0 624 468 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.06.1995 Bulletin 1995/25

(43) Date of publication A2:
17.11.1994 Bulletin 1994/46

(21) Application number: 94303090.8

(22) Date of filing: 28.04.1994
(51) International Patent Classification (IPC)5: B41J 2/025, B41J 2/115
(84) Designated Contracting States:
DE FR GB

(30) Priority: 12.05.1993 US 61184

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

(72) Inventors:
  • Katerberg, James A.
    Kettering, Ohio 45429 (US)
  • Bowers, Mark C.
    Vandalia, Ohio 45377 (US)

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


(56) References cited: : 
   
       


    (54) Improved ink jet stimulation monitoring


    (57) An ink jet printing device has a drop generator for producing continuous streams of ink drops from at least one orifice and further has stimulation control electronics for maintaining desired stimulation conditions in response to a feedback from the drop generator. First and second feedback transducers measure the stimulation amplitude in the drop generator and generate feedback output signals in response to the stimulation. The feedback output signals are approximately equal in magnitude and opposite in sign to each other when the stimulation amplitude in the drop generator is a desired stimulation mode. An amplifier, whose inputs are the feedback output signals, provides an amplifier output signal to the stimulation control electronics which is the difference between the two feedback output signals.






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