Medium Conveyance Sensor Timing for Tilt Change Detection
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Solution Overview
Problem
In medium conveyance systems, such as scanners, changes in the tilt angle of conveyed media can lead to incomplete image capture or paper jams, as the media may strike the conveyance path walls.
Innovation Solution
A medium conveyance apparatus equipped with multiple sensors (first, second, and third sensors) and a processor to determine tilt angle changes based on detection times, ensuring accurate positioning and preventing jams by adjusting conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors are positioned along the conveyance path to detect tilt angle changes, then the reliability of medium conveyance is improved, but the device complexity increases
Solution Approach 1:
The detection system is segmented into multiple sensors positioned at different locations along the conveyance path. Each sensor detects the passage of the medium at its specific position, and the processor analyzes the temporal relationships between these segmented detection events to determine tilt angle changes, thereby improving reliability without requiring a single complex sensor system
Solution Approach 2:
The processor acts as an intermediary that receives detection signals from multiple sensors and performs temporal analysis to determine tilt angle changes. This intermediary approach allows the system to infer medium orientation state from simple presence/absence detection events at different positions, avoiding the need for complex direct tilt measurement sensors
2Reliability
If the system detects tilt angle changes using time-based sensor detection, then complete image capture is ensured, but the measurement precision requirements increase
Solution Approach 1:
The system performs preliminary detection of the medium's presence at multiple positions along the conveyance path before the medium reaches the imaging area. By detecting the medium's passage at upstream positions and calculating time differences, the system can determine tilt angle changes in advance, allowing for preventive correction actions that ensure complete image capture without requiring high-precision real-time tilt measurement during imaging
Solution Approach 2:
The system replaces direct mechanical or optical tilt measurement mechanisms with a temporal analysis approach. Instead of using sensors that directly measure tilt angle, the system uses simple presence detection sensors at multiple positions and processes the time differences between detections to infer tilt angle changes, thereby reducing measurement precision requirements while maintaining reliability
Data Source
AI summary
A medium conveyance apparatus includes a first sensor located at a center part in a direction perpendicular to a medium conveyance direction; a second sensor located at a downstream side from the first sensor in the medium conveyance direction and at the center part in the direction perpendicular to the medium conveyance direction, a third sensor located at a downstream side from the second sensor in the medium conveyance direction and at the one side in the direction perpendicular to the medium conveyance direction, and a processor to determine whether a tilt angle of the medium being conveyed has changed based on a time from when the first sensor detects the medium to when the second sensor detects the medium when the first sensor detects the medium first, the third sensor detects the medium second, and the second sensor detects the medium third.