The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1998
Filed:
Sep. 26, 1996
Stephan Guenther, Berlin, DE;
Wolfgang Pekruhn, Berlin, DE;
Francotyp-Postalia AG & Co., Birkenwerder, DE;
Abstract
An arrangement for monitoring the functioning of an ink print head, an enhancement of the functional dependability by enhancing the monitoring precision given reduced outlay is obtained with a constant monitoring and evaluation of the print format, with the brightness of the recording medium having no influence on the monitoring precision. A sensor head with at least two wiper electrodes is placed on the recording medium following the ink print head and is connected to an evaluation circuit that in turn has an output side connected to the drive circuit for the ink print head. Changes in the electrical properties of the recording medium between the wiper electrodes are acquired in the evaluation circuit, these changes arising due to the presence of just-printed ink thereon. The arrangement is suitable for ink print heads operating according to the bubble jet principle as well as for ink print heads with piezo actuators.