| 摘要 |
<p>A printing apparatus adapted to eject ink droplets from ink ducts, comprising at least one ink duct (5) provided with an electromechanical transducer (2), a drive circuit (3) provided with a pulse generator (4) to energise the said transducer (2), and means for detecting breakdown of the ink duct without interrupting the operation of the printing apparatus ("on the fly"), comprising a measuring circuit (7) for measuring an electrical signal generated by the transducer (2) in response to energisation, and switching means (8) to break the circuits in such manner that the drive circuit (3) is open if the measuring circuit (7) is closed. <IMAGE></p> |
