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IBM Journal of Research and Development  
Volume 21, Number 1, Page 52 (1977)
Ink-jet Printing
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Controlling Print Height in an Ink Jet Printer

by J. M. Carmichael
This paper describes a control system for maintaining constant print height in an ink jet printer. Following power on and during a periodic off-line correction operation a specially designed sensor detects the position of a test group of electrostatically charged ink drops to obtain print height correction data. Information provided by the same sensor is used to synchronize the application of a unique charge to each drop to be printed.
Related Subjects: Electrostatics; Printing, ink jet; Quality control