Discharge recovery method for an ink jet recording head and device for carrying out the same

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EP 0 452 119 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	27.12.1991 Bulletin 1991/52

(43)	Date of publication A2:
	16.10.1991 Bulletin 1991/42

(21)	Application number: 91303184.5

(22)	Date of filing: 10.04.1991

(51)	International Patent Classification (IPC)⁵: B41J 2/165

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB GR IT LI LU NL SE

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Priority:

11.04.1990 JP 95406/90

(60)	Divisional application:
	95200807.6 / 0670223

(71)	Applicant: CANON KABUSHIKI KAISHA
	Tokyo (JP)

(72)	Inventors:
	Koitabashi, Norifumi, c/o CANON KABUSHIKI KAISHA Ohta-ku, Tokyo (JP) Sugimoto, Hitoshi, c/o CANON KABUSHIKI KAISHA Ohta-ku, Tokyo (JP) Tajika, Hiroshi, c/o CANON KABUSHIKI KAISHA Ohta-ku, Tokyo (JP) Matsubara, Miyuki, c/o CANON KABUSHIKI KAISHA Ohta-ku, Tokyo (JP) Arai, Atsushi, c/o CANON KABUSHIKI KAISHA Ohta-ku, Tokyo (JP)

(74)	Representative: Beresford, Keith Denis Lewis et al
	BERESFORD & Co. 2-5 Warwick Court High Holborn London WC1R 5DJ London WC1R 5DJ (GB)

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References cited: :

(54)	Discharge recovery method for an ink jet recording head and device for carrying out the same

(57) This invention provides a novel and effective recovery method and device for an ink jet recording head, which method or device has the step of or means for carrying out substantially at a time a condition for driving discharge energy generating elements to discharge ink from the discharge ports of the head and a condition for effecting the forced discharge of the ink by a suction or pressing pump. According to the present invention, the pump itself can be made compact and moreover, the recovery process of all the discharge ports can be carried out reliably within a short time.

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