Original Reader Sizing via Preliminary Detection and Retransmission
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Solution Overview
Problem
Existing original readers with automatic sheet selection and magnification functions require detection of each original's size, necessitating a longer conveying path or an inversion path, increasing the device's size and manufacturing costs, especially when handling mixed sizes of originals.
Innovation Solution
An original reader with a conveying unit, detection unit, reading unit, storage unit, and communication unit that decides the original's size based on detection results, allowing for provisional size transmission and retransmission if necessary, and enables one-pass double-sided simultaneous reading without a large-capacity image memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conveying path is lengthened to detect original size before reading, then automatic sheet selection and magnification functions can be executed, but the size of the original reader increases
Solution Approach 1:
The patent applies preliminary action by detecting the original size before the reading process starts. The detection unit measures the original size in advance, and the decision unit decides on the sheet size and magnification based on this preliminary detection, enabling automatic sheet selection and magnification functions without requiring a long conveying path.
2Adaptability or versatility
If an inversion path is added to detect original size, then automatic magnification selection can be achieved, but the device complexity and manufacturing costs increase
Solution Approach 1:
The patent extracts the size detection function from the conventional inversion path approach. Instead of requiring an inversion path to detect original size, the invention uses a detection unit that can measure size directly in the conveying path, simplifying the device structure while maintaining automatic magnification selection capability.
3Productivity
If a large-capacity image memory is provided to store two pages of original images, then parallel reading and scaling processing can be performed, but the manufacturing costs increase
Solution Approach 1:
The patent applies preliminary action by deciding the original size before reading starts. This allows the system to perform reading and scaling processing in parallel without requiring a large-capacity image memory to store two pages of original images, as the size information is already determined in advance.
4Adaptability or versatility
If the conveying path is lengthened to detect each original size in mixed bundles, then automatic sheet selection can be executed, but the reading productivity decreases
Solution Approach 1:
The patent applies preliminary action by detecting original size before the reading process. The detection unit measures size in advance, and the decision unit immediately determines sheet size and magnification, enabling automatic sheet selection for mixed bundles without lengthening the conveying path, thus maintaining high reading productivity.
Data Source
AI summary
An original reader capable of being downsized without requiring a large-capacity image memory. A conveying path conveys an original. Sensors are arranged on the conveying path, for detecting the conveyed original. CCD line sensors read the conveyed original. A CPU of the image reader decides the size of the conveyed original based on the results of detection by the sensors. An image memory stores image data output from the line sensors. The CPU transmits the decided original size and the stored image data to a controller. When the CPU cannot decide the original size at a predetermined timing, it transmits one of original size candidates to the controller, as a provisional original size. When the size of the original decided afterwards is different from the provisional original size, the CPU retransmits the decided size of the original.