Global patent index - EP 1048470 A1

EP 1048470 A1 2000-11-02 - Ink jet printer and method for controlling the ink quality in such a printer

Title (en)

Ink jet printer and method for controlling the ink quality in such a printer

Title (de)

Tintenstrahldrucker und Verfahren zur Kontrolle der Tintenqualität in einem solchen Drucker

Title (fr)

Imprimante à jet d'encre et procédé de gestion de la qualité de l'encre d'une telle imprimante.

Publication

EP 1048470 A1 (FR)

Application

EP 00401140 A

Priority

FR 9905362 A

Abstract (en)

A pressure of the ink ejection is related in terms of a speed and temperature in expression P= a asterisk (rn(T) asterisk V<2> + b asterisk (m)T) asterisk V + (rn(T) asterisk g asterisk h. In the expression H is sensed pressure, (rn(T) and (mn(T) are ink jet characteristic curve; a and b characteristic value of ink jet circuit; g - is the acceleration of the mass. Varying the ejection speed the resulting pressure is measured using determined coefficients to achieve corrective actions. A reservoir (10) contains volume of ink (11), the remaining volume (12) is filled of air. A pipe (13) joins the reservoir ( with a printing head (14). Solvent addition devices (16,17) are controlled by valves (26,27) on signals from pressure, temperatu sensors (20-22) and an ejection speed sensor (25) at the exit of the head (14). A control element (18) electrically controls a pressure regulator (23) and electrically controlled condenser (24).

Abstract (fr)

La présente invention concerne une imprimante à jet d'encre et un procédé de gestion de la qualité de l'encre dans une telle imprimante, dans lequel on dispose des informations relatives à la pression d'encre P, la température T et la vitesse de jet V et des caractéristiques de l'encre nominale (n(T), µn(T)). Lors du premier démarrage de la machine, on fait varier la vitesse de jet autour de sa valeur nominale et on mesure la pression résultante de manière à déterminer les valeurs caractéristiques du circuit d'encre a et b, les caractéristiques de l'encre utilisée (T), µ(T) et le dénivelé entre la tête d'impression et le capteur de pression H. Ces valeurs permettent d'établir la pression de consigne et d'engager des actions correctives sur la qualité de l'encre. <IMAGE>

IPC 1-7 (main, further and additional classification)

B41J 2/195; B41J 2/17

IPC 8 full level (invention and additional information)

B41J 2/18 (2006.01); B41J 2/12 (2006.01); B41J 2/17 (2006.01); B41J 2/185 (2006.01); B41J 2/195 (2006.01)

CPC (invention and additional information)

B41J 2/17 (2013.01); B41J 2/195 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE ES GB IT

EPO simple patent family

EP 1048470 A1 20001102; CA 2306680 A1 20001028; CN 1188278 C 20050209; CN 1273912 A 20001122; FR 2792874 A1 20001103; FR 2792874 B1 20010622; JP 2000343710 A 20001212; US 6450601 B1 20020917

INPADOC legal status

2009-04-29 [18D] DEEMED TO BE WITHDRAWN

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- Effective date: 20081031

2001-07-18 [AKX] PAYMENT OF DESIGNATION FEES

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2001-06-13 [17P] REQUEST FOR EXAMINATION FILED

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- Effective date: 20010414

2000-11-02 [AK] DESIGNATED CONTRACTING STATES:

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- Designated State(s): DE ES GB IT

2000-11-02 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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