Sheet Transport Roller Deflection Correction
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately correcting positional deflection of sheets of paper with varying widths, as current solutions require multiple deflection detection sensors and rollers, increasing costs and complexity.
Innovation Solution
A transporting device with a pair of first roller members and detection units, along with a control unit that switches between two positional deflection correction controls based on the sheet's length, using either thrusting or rotational adjustments to correct deflection, allowing for high-accuracy correction regardless of paper width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sets of deflection detection sensors and conveyor rollers are disposed along the width direction to maintain detection accuracy for both large and small sized sheets, then the detection accuracy for sheets of varying widths is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies dynamics by making the roller configuration adjustable rather than fixed. The conveying rollers can be positioned at different locations along the width direction depending on the sheet size being processed. This dynamic repositioning allows a single set of sensors and rollers to effectively serve multiple sheet sizes, resolving the contradiction between maintaining detection accuracy and reducing device complexity
Solution Approach 2:
The patent implements universality by designing a single set of deflection detection sensors and conveyor rollers that can handle both large and small sized sheets through adjustable positioning. The same hardware components perform multiple functions by adapting their location, eliminating the need for separate sensor and roller sets for different sheet sizes
2Measurement precision
If the space between deflection detection sensors is set narrow for minimum width sheets, then the detection is sufficient for small sheets, but the detection accuracy deteriorates for large sized sheets
Solution Approach 1:
The sensor positioning is made dynamic rather than fixed. The deflection detection sensors can be repositioned along the width direction to optimize their spacing based on the sheet size being processed. This allows narrow spacing for small sheets and wider spacing for large sheets, maintaining detection accuracy across all sheet sizes
3Manufacturing precision
If the space between conveyor rollers is set wide for maximum width sheets, then the positional deflection correction is sufficient for large sheets, but the detection and correction capability deteriorates for minimum width sheets
Solution Approach 1:
The conveyor roller positioning is made adjustable rather than fixed. The rollers can be repositioned along the width direction to provide appropriate spacing for different sheet sizes. This dynamic adjustment ensures that small sheets receive adequate correction with narrower roller spacing, while large sheets benefit from wider spacing, maintaining correction effectiveness across all sizes
Data Source
AI summary
A transporting device includes steering rollers, a center roller which is disposed between the steering rollers and deflection-detecting sensors that are positioned downstream from the steering rollers. When a sheet of paper has a width which is narrower than a width of a reference sheet of paper, the positional deflection of the sheet of paper is corrected by transporting the sheet of paper to a shift roller with the sheet of paper being nipped by the center roller and thrusting a forward end of the sheet of paper against a shift roller. When a sheet of paper has a width which exceeds the width of the reference sheet of paper, the positional deflection of the sheet of paper is corrected by rotating the steering rollers separately based on a detected result of the sensors with the sheet of paper being nipped by the steering rollers.