Sheet Registration Roller Layout for Stable High-Speed Skew Correction
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Solution Overview
Problem
Existing image processing apparatuses face issues with sheet skew correction, particularly when high-speed conveying leads to unstable sheet deflection, which can cause damage during skew correction.
Innovation Solution
The apparatus employs a registration roller mechanism with a first and second conveying roller, where the second roller operates at a higher speed than the first, distributing sheet deflection across two loop spaces to stabilize skew correction, and a mechanical registration mechanism adjusts the sheet's posture by allowing the leading end to abut on the registration roller in a stopped state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single loop space is used for sheet deflection during skew correction, then the structure is simple, but the sheet deflection becomes unstable at high conveying speeds causing damage
Solution Approach 1:
The patent divides the single loop space into two separate loop spaces (first loop space between second conveying roller and registration roller, second loop space between first conveying roller and second conveying roller). This segmentation allows the sheet deflection to be distributed across multiple zones, stabilizing the skew correction process even at high conveying speeds and preventing sheet damage.
2Productivity
If the conveying roller operates at high speed for efficient processing, then productivity increases, but sheet deflection becomes unstable during skew correction
Solution Approach 1:
By segmenting the conveying path into two loop spaces with two conveying rollers, the system can maintain high overall conveying speed while distributing the deflection control across multiple zones. The first conveying roller operates at first conveying speed and the second at second conveying speed, allowing optimized speed control for stable skew correction without sacrificing productivity.
Solution Approach 2:
The patent employs dynamic speed control where the first conveying roller and second conveying roller operate at different speeds (first conveying speed and second conveying speed respectively). This dynamic speed differentiation allows the system to maintain high productivity while ensuring stable sheet deflection and accurate skew correction by adjusting the relative speeds of the conveying rollers.
3Device complexity
If only one conveying roller is used upstream of the registration roller, then the device complexity is reduced, but the skew correction accuracy decreases due to unstable sheet deflection
Solution Approach 1:
The patent introduces a second conveying roller upstream of the first conveying roller, creating two distinct loop spaces. This segmentation provides additional control points for sheet deflection, significantly improving skew correction accuracy by stabilizing the sheet posture before it reaches the registration roller, despite the increased device complexity.
Data Source
AI summary
An image processing apparatus includes a registration roller, a first conveying roller, and a second conveying roller. The registration roller is disposed on a conveying path of a sheet to be subjected to image processing, and corrects the skew of the sheet by allowing the leading end of the sheet abut thereon in a stopped state. The first conveying roller is disposed upstream of the registration roller on the conveying path at a position where a first loop space for deflecting the sheet is interposed between the first conveying roller and the registration roller. The second conveying roller is disposed upstream of the first conveying roller at a position where a second loop space is interposed between the two conveying rollers. The second conveying roller conveys the sheet at a conveying speed that is equal to or higher than the conveying speed of the first conveying roller.