Image quality control method and apparatus for multiple marking engine systems
AssigneeXerox Corporation
InventorMichael Mongeon
Life of this patent
Estimating the term…
Abstract
A full width array CCD sensor is incorporated in the media path to monitor fused pages by calculating area coverage from multiple engines in a Tightly Integrated Parallel Process (TIPP) architecture. With knowledge of the area coverage differences between print engines for a given pixel count to the ROS, a relative density difference of each engine is determined. Based on the determined relative density difference, an adjustment is calculated and applied to the engine with the largest error to match the area coverage(s) of the other engine(s).
Claims21
An automatic method for controlling image consistency in an image rendering system that includes marking engines, the method comprising:
- printing a first sheet of a print job on a first print media with a first marking engine;
- printing a second sheet of the print job on a second print media with a second marking engine;
- concurrently with the printing of the first and second sheets of the print job, determining a density inconsistency at least between the first and second sheets of the print job;
- and
- based on the inconsistency determination, adjusting at least one parameter of at least one of the first and the second marking engine to improve image consistency between at least the first and second marking engines.
A document processing system comprising:
- two or more xerographic print engines for printing sheets of a print job, each xerographic print engine having at least one xerographic actuator;
- a sensor for measuring light reflected from each sheet of the print job printed with the print engines;
- an analyzer for analyzing light measurements associated with the sheets printed with different engines and determining an amount of adjustment of at least one parameter of the document processing system for the at least one of xerographic actuators;
- and
- a xerographic actuator adjuster for adjusting the at least one xerographic actuator according to the adjustment amount determined by the analyzer to substantially match the xerography of the engines.
An automatic method for controlling image consistency in a printing system that includes a plurality of print engines, the method comprising:
- printing sheets of paper of a print job with the plurality of print engines;
- comparing the sheets to one another;
- determining which engine of the plurality of print engines has the largest error compared to other engines;
- based on the comparison and the determination, calculating an amount of adjustment of a parameter of the printing system for the engine with the largest error;
- and
- adjusting the parameter of at least the engine with the largest error to improve the image consistency in the print job.
Dependencies are inferred from the claim text.