Media Edge Detection During Transport Stops in Image Forming
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Solution Overview
Problem
The orientation of a medium transported by a transport member can vary easily, making it difficult to accurately detect the edge portion of the medium.
Innovation Solution
A detection device that stops the transportation of the medium, allowing the detection unit to accurately sense the edge portion while the medium is in a stopped state, using a transport unit that changes direction and includes support units to stabilize the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the medium is transported by the transport member, then the medium can be moved through the apparatus, but the orientation of the medium varies easily making edge portion detection inaccurate
Solution Approach 1:
The transport unit stops the medium before the detection unit performs measurement. This preliminary stopping action ensures the medium is stationary during edge portion detection, eliminating orientation variations that occur during transport and thereby improving detection accuracy.
Solution Approach 2:
The transport unit acts as an intermediary between the medium transport process and the detection process. It mediates by controlling the medium's motion state - stopping it during detection and resuming transport afterward - thus resolving the conflict between continuous transport and accurate stationary measurement.
2Measurement precision
If the transport unit stops the medium for detection, then edge portion detection accuracy improves, but transportation time increases
Solution Approach 1:
The transport unit stops the medium only partially - just long enough for the detection unit to capture the edge portion position, not for the entire processing cycle. This partial stopping minimizes time loss while achieving the necessary detection accuracy.
Solution Approach 2:
The system maintains continuous useful action by immediately resuming medium transport after detection. The stop is brief and targeted, allowing the overall transport process to remain largely continuous, thus minimizing time loss while ensuring accurate detection when needed.
Data Source
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AI summary
A detection device includes: a transport unit that stops transportation of a medium on which a first image is formed, the transport unit restarting the transportation of the medium toward an image forming unit after the medium has been in a stopped state, the image forming unit forming a second image on the medium; and a detection unit that detects an edge portion of the medium while the medium is in the stopped state.