Duplex Print Alignment via Independent Geometric Parameter Control
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Solution Overview
Problem
In digital duplex printing systems, the lack of adjustment for differences in magnification between the front and back sides of a printed sheet leads to misregistration and alignment issues, particularly noticeable in translucent media, causing defects and inefficiencies in overprinting processes.
Innovation Solution
A user interface and control system that allows independent adjustments of geometric parameters such as registration, magnification, and skew for both sides of a sheet, using a print engine to render images based on input adjustments, with the ability to print test images and evaluate adjustments for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If geometric adjustment functions are used in video path software routines, then image alignment can be adjusted, but rapid adjustments to parameters cannot be made and the system is complex
Solution Approach 1:
The patent replaces complex software-based geometric adjustment functions with a simplified hardware mechanism. A motorized adjustment mechanism with a motor, drive gear, and movable gear physically adjusts the position of the print medium or imaging components, substituting mechanical action for complex video path software routines while enabling rapid parameter changes through direct physical control
Solution Approach 2:
The system implements self-service through automated feedback control. A sensor detects the actual position of the print medium or imaging components, and this information feeds back to a controller that automatically adjusts the motorized mechanism to achieve the desired alignment, eliminating the need for complex manual software adjustments
2Manufacturing precision
If hardware mechanical adjustments are made to magnification, registration, and skew, then physical alignment can be corrected, but the hardware cannot compensate for fuser shrinkage, paper cut tolerances, and pre-print image characteristics
Solution Approach 1:
The patent segments the alignment correction into multiple independent adjustable parameters. Instead of a single mechanical adjustment, the system provides separate control for magnification, registration, and skew parameters, allowing each aspect of alignment to be independently optimized to compensate for different sources of error including fuser shrinkage and paper variations
Solution Approach 2:
The system employs parameter changes by providing adjustable control parameters for magnification, registration, and skew. These parameters can be modified to compensate for fuser shrinkage, paper cut tolerances, and pre-print image characteristics, transforming the hardware system into an adaptive solution that can handle various sources of alignment error
3Productivity
If duplex printing is performed without adjustment for magnification differences, then the printing process is simple and fast, but misregistration and alignment issues occur between front and back sides
Solution Approach 1:
The patent implements preliminary action by providing adjustment mechanisms that can be configured before the duplex printing process begins. The motorized adjustment mechanism and control parameters are set up in advance to compensate for expected magnification differences, allowing fast duplex printing to proceed with pre-established alignment corrections rather than requiring real-time adjustments during printing
Data Source
AI summary
A printing system includes a control system which processes an input print job to place it in a form for printing on a print engine. A user interface, in communication with the control system, is configured for receiving, from a user, adjustments to at least one geometric parameter for images of the print job to be applied to front and back sides of a sheet, whereby the geometric parameter is adjustable for the front and back sides independently. A print engine renders the print job on print media in accordance with received adjustments to the at least one geometric parameter.