EP 0771655 B1 20020925 - Short detection circuit for ink jet printer
Title (en)
Short detection circuit for ink jet printer
Title (de)
Kurzschlussnachweisschaltung für Tintenstrahldrucker
Title (fr)
Circuit de détection de court-circuits pour imprimante à jet d'encre
Publication
Application
Priority
US 55095895 A 19951031
Abstract (en)
[origin: EP0771655A2] A detection technique comprises a plurality of closely spaced, continuous detection electrodes placed immediately below and along the length of a charge plate in an ink jet printing system. The detection electrodes typically comprise parallel conductors. A circuit is provided for monitoring the conductivity between the electrodes. The electrodes are electrically isolated from one another when properly placed on the catcher surface. If the conductivity, as measured by the circuit, rises above a predetermined threshold level it is an indication that some amount of unwanted ink is present at the location of the conductors. This signals improper print head operation requiring a print head shut-down and/or clean cycle. <IMAGE>
IPC 1-7
IPC 8 full level
B41J 2/07 (2006.01); B41J 2/075 (2006.01); B41J 2/125 (2006.01); B41J 2/185 (2006.01)
CPC (source: EP)
B41J 2/07 (2013.01); B41J 2/125 (2013.01); B41J 2/185 (2013.01); B41J 2002/1853 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0771655 A2 19970507; EP 0771655 A3 19980916; EP 0771655 B1 20020925; CA 2189284 A1 19970501; DE 69623907 D1 20021031; DE 69623907 T2 20030807; JP 3946800 B2 20070718; JP H09201974 A 19970805
DOCDB simple family (application)
EP 96307865 A 19961030; CA 2189284 A 19961031; DE 69623907 T 19961030; JP 28996296 A 19961031