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公开(公告)号：EP0968088B1
公开(公告)日：2002-07-10
申请号：EP97950282.0
申请日：1997-12-18
摘要： A method is disclosed for adjusting the amplitude of the pressure modulation waveform in a multi-nozzle continuous ink 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 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, 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 optimise the break-up length of the droplet streams.
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公开(公告)号：EP0964784B1
公开(公告)日：2002-07-03
申请号：EP97950277.0
申请日：1997-12-18
IPC分类号： B41J2/085
CPC分类号： B41J2/085
摘要： 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.
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