Apparatus and methods for improved printing in a tandem LED...

Details Apparatus and methods for improved printing in a tandem LED... Apparatus and methods for improved printing in a tandem LED...

2011-04-05

2011-04-05

Thompson, James A (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Detail of medium positioning

C358S003230, C358S514000, C347S007000, C347S019000, C347S116000, C399S027000, C399S045000

Reexamination Certificate

active

07920279

ABSTRACT:
Apparatus and methods for adjusting a skew angle of an LED array in the second of dual/tandem print engine systems to compensate for shrinkage of the printable medium exiting the first print engine. Features and aspects hereof provide for manually and/or automatically measuring the shrinkage of the printable medium as it exits the first print engine and for automatically and/or manually adjusting the skew angle of the mounting of the LED array in the second print engine. The image data applied through the LED to the corresponding photoconductor of the second print engine is similarly skewed to match the skew angle of the LED array. Thus a substantially normal bitmap image is applied through the skewed LED to the photoconductor of the second print engine shrunk in the width dimension. Visual artifacts and anomalies from the mathematical approximations and rounding are visually imperceptible at sufficiently high resolutions.

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