EP 4303008 A1 20240110 - ELECTRIC CIRCUIT FOR PARALLEL EJECTION ELEMENT FAILURE DETECTION
Title (en)
ELECTRIC CIRCUIT FOR PARALLEL EJECTION ELEMENT FAILURE DETECTION
Title (de)
ELEKTRISCHE SCHALTUNG ZUR DETEKTION DES AUSFALLS EINES PARALLELEN AUSWURFELEMENTS
Title (fr)
CIRCUIT ÉLECTRIQUE DE DÉTECTION DE DÉFAILLANCE D'ÉLÉMENT D'ÉJECTION PARALLÈLE
Publication
Application
Priority
EP 22183845 A 20220708
Abstract (en)
An electric circuit for monitoring a condition of an ink ejection unit in an array of ink ejection units (111, 112, 113, 114) is described. Each ejection unit comprises an ink channel connected to a piezo-electric element. The monitoring is done by a measurement of a residual pressure wave in the ink channel. The circuit comprises a controllable switch (4) for making contact with the piezo-electric element, a comparator (8) for comparing an electric signal from the piezo-electric element with a reference signal, a digital memory (6) for saving a digital reference signal and a digital-analog converter. In this circuit each piezo-electric element or group of elements is associated with a specific part of the digital memory, comprising a corresponding reference signal. This enables a parallel monitoring of several ejection units during printing.
IPC 8 full level
B41J 2/045 (2006.01)
CPC (source: EP)
B41J 2/0451 (2013.01)
Citation (search report)
- [XI] US 2011285773 A1 20111124 - SHINKAWA OSAMU [JP]
- [A] US 2015367633 A1 20151224 - MURATE HIROHITO [JP]
- [A] US 2012293577 A1 20121122 - KYOSO TADASHI [JP], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DOCDB simple family (application)
EP 22183845 A 20220708