Rotating Sensor Switching Detection Position for Document Transport
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Solution Overview
Problem
Existing medium transporting apparatuses in image reading devices require multiple sensors to accurately detect document positions, leading to increased costs and complexity.
Innovation Solution
A medium transporting apparatus with a transport roller pair, dual medium transport paths, and a medium detection unit featuring a first and second rotating portion with contact portions that switch detection postures to detect the medium at multiple positions, reducing the need for multiple sensors and enhancing cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors (upstream sensor and downstream sensor) are provided to accurately detect document positions, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
A single sensor is designed to perform multiple detection functions by switching its detection position between upstream and downstream locations. The sensor can detect document positions at different locations along the transport path, effectively replacing what would traditionally require separate upstream and downstream sensors, thereby reducing component quantity while maintaining comprehensive detection capability
Solution Approach 2:
The sensor is made movable between different detection positions (upstream and downstream) rather than being fixed at a single location. This dynamic positioning allows one sensor to cover multiple detection zones, achieving the functionality of multiple sensors with a single movable component, thus reducing device complexity while preserving measurement precision
Data Source
AI summary
A medium transporting apparatus includes a first medium transport path in which a transport roller pair is provided, a second medium transport path for feeding a medium fed downstream in a medium transport direction from the transport roller pair to an upstream position of the transport roller pair in the first medium transport path, and a medium detection unit for detecting passage of a medium in the first medium transport path, in which a position at which the medium detection unit detects a medium is switched between a transport direction upstream position and a transport direction downstream position of the transport roller pair according to whether or not a medium is transported on the second medium transport path.