Two-Stage Sheet Skew Correction for Duplex Image Alignment
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Solution Overview
Problem
Existing medium transport devices in image forming apparatuses face inefficiencies in correcting medium inclination and positional misalignment, particularly when sequential correction methods are insufficient for large skew amounts or require temporary transport halts.
Innovation Solution
A medium transport device with a first inclination corrector and a second inclination corrector on the upstream side, combined with a positional corrector, to sequentially correct medium inclination and position, using adjustable roller speeds and abutment gates for comprehensive correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential correction methods are used for medium inclination and position, then device complexity is reduced, but manufacturing precision is insufficient for large skew amounts
Solution Approach 1:
The correction mechanism is segmented into two independent correctors: a first inclination corrector for correcting medium inclination, and a second inclination corrector for correcting position. Each corrector handles a specific correction task independently, allowing the system to achieve high manufacturing precision without requiring an overly complex integrated mechanism.
2Device complexity
If sequential correction is performed, then device complexity is reduced, but loss of time occurs due to temporary transport halts
Solution Approach 1:
The first inclination corrector performs preliminary inclination correction on the medium before it reaches the second inclination corrector. This preliminary action ensures that the medium is pre-aligned, reducing the burden on the second corrector and eliminating the need for temporary transport halts, thus maintaining continuous operation and reducing time loss.
3Device complexity
If single inclination corrector is used, then device complexity is reduced, but manufacturing precision is insufficient for comprehensive correction
Solution Approach 1:
The correction function is segmented between two specialized correctors: the first inclination corrector handles inclination correction, and the second inclination corrector handles positional correction. This segmentation allows each component to be optimized for its specific function, achieving comprehensive manufacturing precision without requiring a single overly complex corrector.
Data Source
AI summary
A medium transport device includes a positional corrector configured to transport a medium and correct a position of the medium in a width direction of the medium by moving the medium in the width direction, a first inclination corrector disposed on a transport path of the medium and configured to correct an inclination of the medium relative to a transport direction of the medium, and a second inclination corrector configured to correct the inclination of the medium on an upstream side of the first inclination corrector in the transport direction.