Incremental printing of symbolic information – Ink jet – Controller
Patent
1992-04-07
1995-10-03
Royer, William J.
Incremental printing of symbolic information
Ink jet
Controller
347 89, B41J 2175
Patent
active
054556066
ABSTRACT:
An ink jet printer automatically adjusts the amplitude of the modulation signal applied to a transducer (159) to break the ink jet into droplets. Correct modulation amplitude is determined from changes in jet break-up length, as determined by changes in jet break-up length, as determined by changes in jet break-up phase relative to the modulation signal.
The printer has interchangeable print heads (3), which may have different nozzle sizes. A calibration code, specifying the particular values of ink pressure, jet velocity and charge correction required for optimum performance of a particular print head (3), may be entered into control logic (93), which operates the printer accordingly.
Most print head components are mounted on a mounting subtract (111), with all connections being made to the underside of the mounting subtract (111) and sealed with a potting compound, to avoid damage.
Ink viscosity is controlled in response to ink pressure, which is in turn controlled in response to ink jet velocity. Thus all three parameters are maintained without the need for a viscosity meter. Ink jet velocity is sensed from signals induced by charged drops on spaced apart sensors (89, 91), the outputs from which are wired together and fed to a common comparator (105), which simplifies construction.
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M. R. Keeling, Ink Jet Printing, Phys. Technol., vol. 12, 1981, pp. 196-202 (esp. 200).
Keeling Michael R.
Weinberg Hillar
Linx Printing Technologies PLC
Royer William J.
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