Copying Machine Reading Mechanism Sensorless Area Detection
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Solution Overview
Problem
Conventional image scanners require an additional original size detecting sensor to determine the target reading area, which is not necessary in the proposed copying machine configuration.
Innovation Solution
The copying machine uses a reading mechanism with a defined basic point on an original sheet placement table, where the reading position is adjusted in the auxiliary direction to determine the target reading area based on designated sheet sizes stored in memory, without the need for an additional sensor, by obtaining and analyzing one-line data from the reading mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an original size detecting sensor is added to determine the target reading area, then the accuracy of reading area determination is improved, but the device complexity increases
Solution Approach 1:
The patent merges the size detection function into the existing reading mechanism by utilizing the CCD elements to read one line of image data at a specific position. Instead of adding a separate original size detecting sensor, the system uses the reading mechanism itself to obtain line data that contains size information, thereby combining multiple functions into a single component and reducing device complexity while maintaining measurement accuracy
Solution Approach 2:
The reading mechanism is given a dual function: it serves both as the image reading device and as the size detection device. By configuring the reading mechanism to read one line of image data at a position corresponding to the longer side length of the designated sheet size, the system enables the same component to perform both reading and size measurement tasks, eliminating the need for dedicated size detecting sensors
2Measurement precision
If an original size detecting sensor is used to determine sheet size, then the sheet size detection capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the size detection capability with the existing reading mechanism, eliminating the need to manufacture and install separate size detecting sensors. By using the CCD elements to read line data that encodes size information, the system reduces component count and assembly complexity, thereby lowering manufacturing costs while maintaining sheet size detection capability
Solution Approach 2:
The reading mechanism performs self-service by using its own reading capability to detect sheet size. The system reads one line of image data from the original sheet at a specific position, and the controller determines the sheet size based on this line data, allowing the reading mechanism to serve both its primary reading function and the secondary size detection function without requiring additional specialized components
Data Source
AI summary
A copying machine changes a reading position to a first position corresponding to the designated sheet size without executing reading, obtains first line data corresponding to a length of a longer side of the designated sheet size by causing the reading mechanism to read one line of image along the main scanning direction when the reading position is the first position, determines the target reading area on the original sheet placement table with use of the main length of the original sheet and the designated sheet size when the main length of the original sheet is identifiable with use of the first line data, the target reading area having a rectangular shape, one of vertexes of the rectangular shape being the basic point, and generates read data representing a read image within the target reading area by causing the reading mechanism to read the target reading area.