Elektrische Schaltung zur Detektion des Ausfalls eines Parallelen Auswurfelements

Details

Veröffentlichungs-Nr.

EP4303008

Aktenzeichen

EP22183845

Anmeldetag

8. Juli 2022

Veröffentlichung

10. September 2025

Erteilung

10. September 2025

Rechtsraum

EP

IPC

B41J2/045

Abstract

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.

Anmelder

Firma

Canon Production Printing Holding B.V.

Land

🇳🇱 Niederlande

Fachgebiete