Systems and method for establishing positional accuracy in two d

Details Systems and method for establishing positional accuracy in two d Systems and method for establishing positional accuracy in two d

1996-03-25

1998-08-18

Wong, Peter S.

Incremental printing of symbolic information

Ink jet

Controller

347 37, B41J 29393

Patent

active

057964149

ABSTRACT:
The invention is a system for determining positional deviation of at least one automatic marking implement from a nominal position, and an apparatus and method for establishing positional accuracy of such an implement. Calibration patterns including diagonal indicia are formed along only one dimension of a printing medium by the implement, or implements. Preferably a sensor automatically scans the diagonal pattern along one dimension, ideally the same dimension--without operating in a second, orthogonal direction. Nevertheless scanning of the diagonal indicia enables development of composite information about deviations in both directions. There is no necessity of either forming or sensing any pattern that is extended (by more than one marking-implement swath) in two different directions. The composite information is combined with information about deviations along the same scanning direction exclusively, to extract in isolated form the deviation information for the second, orthogonal direction. The invention is particularly useful in determining deviations from nominal offsets between plural marking implements, such as thermal-inkjet pens holding ink of different colors in a computer-controlled printer.

REFERENCES:
patent: 4856903 (1989-08-01), Kipphan et al.
patent: 4878753 (1989-11-01), Nestmeier
patent: 5287162 (1994-02-01), de Jong et al.

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