Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1999-07-07
2001-07-10
Le, N. (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S015000, C347S043000
Reexamination Certificate
active
06257698
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to ink jet printing and, more particularly, to printing in different density masking printing modes.
2. Prior Art
U.S. Pat. No. 5,600,353 discloses an apparatus and method of transitioning between ink jet printing modes. Two different sheet advancement distances are disclosed. Shingling using reduced percentage print densities is also disclosed.
SUMMARY OF THE INVENTION
In accordance with one method of the present invention, a method of printing on a print medium with an ink jet printing mechanism having a print head with at least two nozzle arrays is provided. The method comprising steps of printing with the nozzle arrays in a first printing mode, the first printing mode comprising the at least two nozzle arrays printing during a pass of the print head relative to the print medium, a second one of the nozzle arrays printing with a first density masking such that a portion of nozzles of the second nozzle array are prevented from printing during the pass; and switching to printing in a second printing mode when a subsequent pass of the print head relative to the print medium does not require printing from the first nozzle array, the second printing mode comprising the second nozzle array printing without the first density masking during the subsequent pass.
In accordance with another method of the present invention, method for accelerating printing by an ink jet printing mechanism onto a print medium is provided. The ink jet printing mechanism has a print head with at least two nozzle arrays. The method comprising steps of printing with the at least two nozzle arrays during a pass of the print head relative to the print medium; advancing the print medium a first advancement distance after the pass; switching a print density filter to one of the nozzle arrays from a first percentage density filtering state to a second different percentage density filtering state for a subsequent pass of the print head relative to the print medium; and advancing the print medium a second different advance distance after the subsequent pass, the second different advancement distance being longer than the first advancement distance.
In accordance with one embodiment of the present invention, an ink jet printing apparatus is provided comprising a controller having a print density filter; a print medium advancer connected to the controller; a movable print head connected to the controller and having arrays of ink jet nozzles for printing black ink and color ink print data. The controller is programmed to scan the print data for a print head pass to be printed; if the print data includes color ink print data, apply a first setting for the print density filter to at least some of the ink jet nozzles which will print black ink data for the pass; and when the print data for the print head pass and the print data of at least one previous print head pass match a predetermined pattern, changing the setting of the print density filter for the print head pass to a second different setting.
REFERENCES:
patent: 4833491 (1989-05-01), Rezanka
patent: 5428377 (1995-06-01), Stoffel et al.
patent: 5600353 (1997-02-01), Hickman et al.
patent: 5714990 (1998-02-01), Courtney
patent: 5821957 (1998-10-01), Berge et al.
patent: 5923349 (1999-07-01), Meyer
Bloomberg Steven Jay
Xie Yonglin
Le N.
Nguyen Lamson D.
Perman & Green LLP
Xerox Corporation
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