Double-feed Detection in Document Conveyance Systems
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Solution Overview
Problem
Conventional reading devices often require users to wait unnecessarily due to double-feed errors, either halting the reading process or completing it before allowing users to address the issue, leading to inefficiencies in operation time.
Innovation Solution
A reading device equipped with a conveying portion, reader, user interface, timer, and controller that detects double-feeds, halts conveyance, notifies the user, and allows for resumed or continued operation based on user input or determination of conveyance feasibility within a prescribed time frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reading device halts conveyance when a double-feed is detected, then the original document is protected from damage, but the user must wait for the reading operation to complete or return to restart the operation, resulting in lengthy operating time
Solution Approach 1:
The system performs preliminary detection of double-feed conditions and notifies the user before the reading operation fully completes. The timer starts counting from the moment double-feed is detected, and the system waits for user response within this time window rather than completing the entire reading process first, thereby reducing unnecessary waiting time while still protecting the document.
Solution Approach 2:
The system provides real-time feedback to the user through notification upon detecting a double-feed condition. This feedback mechanism allows the user to be immediately informed of the issue and take corrective action during the reading process, rather than waiting for the operation to complete or receiving no notice at all, thus reducing operating time while maintaining document protection.
2Productivity
If the reading device completes reading even when double-feed occurs, then the reading operation finishes without interruption, but the user must wait until the entire reading operation is complete before addressing the double-feed issue
Solution Approach 1:
The system performs preliminary notification of the double-feed condition during the reading process rather than waiting for completion. The timer starts from the moment of detection, creating a time window for user intervention before the reading operation fully completes. This allows the user to address the double-feed issue sooner rather than waiting for the entire reading process to finish, reducing unnecessary waiting time while maintaining operational flow.
3Ease of operation
If the reading device waits for user response within a prescribed time interval, then user involvement is secured when possible, but the system must balance between resuming operation and continuing to halt based on user input
Solution Approach 1:
The system performs preliminary notification and starts a timer upon detecting double-feed, creating a predetermined time window for user response. This preliminary action allows the system to be ready to respond to user input without requiring complex continuous monitoring throughout the entire reading process. The timer-based approach simplifies the control logic by establishing a clear time boundary for user intervention rather than requiring ongoing complex decision-making.
Solution Approach 2:
The system changes the state parameter from halted to resuming based on user input within the timer window. By using a timer-based parameter change approach, the system can switch between different operational states (halting, waiting for input, resuming) in a controlled manner. This parameter-based state management simplifies the control logic compared to continuous complex decision-making, while still providing ease of operation through user-responsive control.
Data Source
AI summary
In a reading device, a controller performs: detecting occurrence of a double-feed; executing a double-feed process; detecting a state of double-fed sheets; executing a first process when a command is inputted; and executing a second process when the command is not inputted. The double feed process includes: halting conveyance of an original document; and making notification of the occurrence of the double-feed. The first process performs, in accordance with the command, one of: resuming the conveyance of the original document; and quitting the conveyance of the original document. The second process performs, in accordance with a determination result, one of: resuming the conveyance of the original document; and continuing the halting and the making. The resuming is performed when the determination result indicates that the conveyance of the original document is possible. The continuing is performed when the determination result indicates that the conveyance of the original document is impossible.