Videojet Technologies Inc.

Domino Printing Sciences Plc

Peter Kassner

Ammar Lecheheb

Matthew Brian Tomlin

Robert Smith

Michael Stamp

Philip John Blowfield

Steven Richard Harris

Michael Jeffrey Stamp

A method of driving an electromechanical converter of a print head of a continuous inkjet printer, wherein the electromechanical converter is arranged to break up a continuous stream of ink into a plurality of drops. The method includes determining a modulation voltage to drive the electromechanical converter, at least a property of the modulation voltage being controlled to take into account movement of a break up point of the continuous stream of ink, and to ensure that in a characteristic of modulation voltage versus a property at least indicative of a break up point of the continuous stream of ink, the characteristic has a predetermined gradient, or a gradient related to this predetermined gradient; and driving the electromechanical converter at the determined modulation voltage.

Electromechanical converter for ink jet printing

An ink jet printer comprising a printing fluid cartridge receiving portion arranged to receive a printing fluid cartridge () and to allow passage of printing fluid from a received printing fluid cartridge to printing fluid conduits of the ink jet printer; a data reader arranged to read data indicating a quantity of fluid within a received cartridge from an electronic data storage device associated with the received printing fluid cartridge; and a controller arranged to generate update data usable to modify data stored on said electronic data storage device and to modify data stored on said electronic storage device based upon said update data such that data stored on said electronic data storage device indicates an updated quantity of fluid in said printing fluid cartridge.

Ink jet printer

A method is disclosed for controlling a multi-nozzle CIJ printhead having a pressure modulator for causing streams of ink emitted from the nozzles to be broken up into individual droplets, and charge electrodes 6 and charge electrode controllers for controllably applying a charge to individual ones of the droplets in each stream. The method involves generating a modulation waveform to operate the pressure modulator to cause droplets to be generated in each stream and operating the charge controllers to supply a charge signal waveform to each charge electrode. The charges applied to the streams of droplets are compared to a reference or threshold value. The number of droplet streams in which the droplet charges exceed the reference or threshold value is determined plural times and an average value for the number is calculated. This step is repeated a number of times and if the average is less than the average previously calculated then the threshold or reference value is reduced.

Continuous inkjet printhead control

A method for adjusting the amplitude of the pressure modulation waveform in a multi-nozzle continuous jet printhead having a pressure modulator for causing streams of ink emitted from the nozzles to be broken up into individual droplets, and charge electrodes and change electrode controllers for controllably applying a charge to individual ones of the droplets in each stream. The method involves generating a modulation waveform to operate the pressure modulator to cause droplets to be generated in each stream, operating the charge controllers to supply a charge signal waveform to each charge electrode; and periodically determining the phase relationship between the charge signal waveforms applied by the charge controllers and the pressure modulation waveform to achieve satisfactory charging of the droplets, determining the spread of the phase relationships to achieve satisfactory charging of the droplets, and thereafter incrementally adjusting the amplitude of the pressure modulation waveform upwardly or downwardly to optimize the break-up length of the droplet streams.

Growing community of inventors

Algarve, Portugal

Peter Kassner