(19)
(11) EP 0 067 515 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.11.1983 Bulletin 1983/45

(43) Date of publication A2:
22.12.1982 Bulletin 1982/51

(21) Application number: 82302272

(22) Date of filing: 04.05.1982
(84) Designated Contracting States:
DE GB IT

(30) Priority: 04.05.1981 US 260474

(71) Applicant: XEROX CORPORATION
 ()

(72) Inventors:
  • Rezanka, Ivan
     ()
  • Kords, Donald N.
     ()
  • Wojciechowski, Matthew P.
     ()

   


(54) Method and apparatus for controlling of an ink jet printer


(57) An ink jet printing machine and method of printing in which a print head (10) is switched from the energized condition to the de-energized condition without emitting undesired writing fluid therefrom. Means (10, 30) is provided for projecting a flow of writing fluid in the energised condition and for preventing the flow of fluid being projected in the de-energised condition. Switching means (34, 36) switches the projecting means from the energised to the de-energised condition with no undesired writing fluid by emitted and ingestion of air, preferably by controlling the pressure of the writing fluid in the head (10) so that it is reduced in two steps.






Search report