EP 0622209 A2 19941102 - Method for detecting and correcting an intrusion of air into a printhead substrate of an ink jet cartridge.
Title (en)
Method for detecting and correcting an intrusion of air into a printhead substrate of an ink jet cartridge.
Title (de)
Verfahren zur Erkennung und Korrektur eingedrungener Luft im Druckkopf-Substrat einer Tintenstrahldruckpatrone.
Title (fr)
Méthode de détection et de correction d'intrusion d'air dans un substrat de tête d'impression d'une cartouche à jet d'encre.
Publication
Application
Priority
US 5669893 A 19930430
Abstract (en)
An intrusion of air (22) into the ink chambers (24) of a printhead substrate (50) is a symptom of either a depleted ink supply (26) or a deprimed printhead substrate (50). When the printer (20) attempts to print with a depleted ink supply (30) or a deprimed printhead substrate (50), the printhead substrate (50) must absorb all of the energy dissipated in the ink chambers (24) to eject the drops. This causes the printhead substrate (50) to reach high temperatures. The present invention detects a depleted ink supply (26) and a deprimed printhead (50) by monitoring the temperature of the printhead substrate (50) and comparing this temperature with a threshold (84, 90, 96). When this temperature exceeds the threshold (84, 90, 96) for more than an allotted amount of time, then corrective action is taken. <IMAGE>
IPC 1-7
IPC 8 full level
B41J 2/175 (2006.01); B41J 2/19 (2006.01)
CPC (source: EP)
B41J 2/19 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0622209 A2 19941102; EP 0622209 A3 19950222; EP 0622209 B1 19990825; DE 69420173 D1 19990930; DE 69420173 T2 20000406; JP H071745 A 19950106
DOCDB simple family (application)
EP 94106002 A 19940418; DE 69420173 T 19940418; JP 11226094 A 19940427