Image Reading Apparatus Conveyance Control for Shading Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing image reading apparatuses face issues where originals are not read due to errors in shading processing, leading to reduced productivity, as they start feeding originals before shading processing is complete, and there is no effective mechanism to prevent originals from being conveyed before reading is completed.
Innovation Solution
An image reading apparatus with a controller that manages the conveyance of originals by switching the drive force transmission state, allowing the first original to be continuously conveyed while the second original stops at a specific position, and the third original to stop at a downstream position, ensuring that the first original is read before the second is conveyed, thus preventing incomplete reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the feeding of the original is started before the shading processing is completed to improve productivity, then the productivity is improved, but the original may reach the reading position before shading processing is completed and not be read properly
Solution Approach 1:
The system performs preliminary shading processing before the original reaches the reading position. The controller starts shading processing in advance and monitors its completion status, ensuring that shading is finished before the original arrives at the reading position, thus preventing reading errors while maintaining continuous operation
Solution Approach 2:
The controller continuously monitors the shading processing status and provides feedback to adjust the conveyance timing. When shading processing is not completed by a predetermined time, the controller stops the conveyance rollers to prevent the original from reaching the reading position prematurely, ensuring reliable reading
2Reliability
If the memory capacity is insufficient to store image data, then the system must stop conveyance to prevent data loss, but this stops productivity
Solution Approach 1:
The controller predicts future memory capacity requirements based on the number of originals remaining in the conveyance path and performs preliminary actions to stop conveyance before memory overflow occurs. This prevents data loss while minimizing interruptions to productivity
Solution Approach 2:
The system dynamically adjusts the conveyance speed and stopping timing based on real-time memory capacity and the number of originals in the conveyance path. The controller calculates the optimal stopping point to ensure memory sufficiency while maintaining continuous operation as much as possible
3Reliability
If the original is stopped at an upstream position to ensure reading completion, then reading reliability is improved, but the reading position is farther from the original position increasing conveyance time
Solution Approach 1:
The system performs preliminary shading processing and positioning operations before the original reaches the reading position. By completing preparatory actions in advance, the original can be stopped closer to the reading position without compromising reading reliability, thus reducing conveyance time
Data Source
AI summary
An image reading apparatus configured to read an image of an original, the image reading apparatus includes an original tray on which the original is to be placed; a pickup roller configured to feed the original placed on the original tray to a conveyance path; a first conveyance roller configured to convey the original which is fed to the conveyance path by the pickup roller; a second conveyance roller, which is located downstream of the first conveyance roller in a conveying direction in which the original is conveyed, configured to convey the original which is conveyed by the first conveyance roller; and a reading unit configured to read, at a reading position, an image of the original being conveyed by the first conveyance roller, the reading position being a position located downstream of the second conveyance roller in the conveying direction.