Image Formation Position Adjustment for Sheet Feeder State Changes
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Solution Overview
Problem
In production printing machines, positional misalignment of images on the front and back surfaces of sheets occurs due to mechanical changes during sheet changes, leading to wasted sheets, as conventional techniques do not account for alignment between the two surfaces.
Innovation Solution
An image forming method and system that detects state changes in the sheet feeder and adjusts the image formation position on both surfaces using scanners and a processor to eliminate positional misalignment, ensuring accurate alignment during both side printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional printing techniques are used without sheet change detection, then the printing process is simple and fast, but positional misalignment occurs between front and back surface images when sheets are changed
Solution Approach 1:
The system performs preliminary detection of sheet changes through sensors (door sensors, tray sensors) before printing occurs. When a sheet change is detected, the system automatically executes formation position adjustment in advance to prevent misalignment, rather than correcting it after it occurs.
Solution Approach 2:
The system continuously monitors sheet feeder state through sensors and uses this feedback to trigger formation position adjustment when sheet changes are detected. The processor receives feedback from door sensors and tray sensors, then automatically adjusts the formation position to maintain image alignment between front and back surfaces.
2Manufacturing precision
If manual adjustment of image formation position is performed, then alignment precision can be maintained, but operation time increases and productivity decreases
Solution Approach 1:
The system performs self-adjustment of formation position automatically when sheet changes are detected. The processor controls the image former to adjust image formation position without requiring manual intervention, thereby maintaining alignment precision while preserving printing speed.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated control system that uses sensors and processors to detect sheet changes and automatically adjust formation position. This substitution eliminates manual operations while maintaining precision and improving productivity.
3Manufacturing precision
If deflection correction is applied only for mechanical misalignment, then sub-scanning direction alignment is improved, but positional misalignment between front and back surfaces is not addressed
Solution Approach 1:
The formation position adjustment mechanism is designed to handle multiple types of misalignment issues simultaneously. It corrects both sub-scanning direction mechanical misalignment and front-back surface positional misalignment that occur during sheet changes, making the system universally applicable to various alignment problems.
Solution Approach 2:
The system changes the formation position parameter dynamically based on detected sheet changes. When sheet changes are detected through sensor feedback, the processor adjusts the formation position parameter to compensate for both mechanical misalignment and sheet-related misalignment, thereby addressing multiple alignment issues through parameter modification.
Data Source
AI summary
An image forming method for an image forming system that includes an image former that performs both side printing for one sheet and a sheet feeding apparatus and a tray (sheet feeder) that stores a sheet to be fed to the image former, includes detecting a state change of the sheet feeder; and executing adjustment for a formation position of an image to be subjected to both side printing in a case where a state change of the sheet feeder has been detected.