Document Conveyance Control for Precise Scanner Stop Positions
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Solution Overview
Problem
Existing image reading devices struggle with accurately stopping documents at appropriate positions during conveyance, leading to increased user effort and time when cancellation or preview instructions are given, especially when multiple documents are being processed.
Innovation Solution
The device incorporates a control unit that detects the presence of subsequent documents using detection units and adjusts motor operation based on user instructions, ensuring documents are stopped at precise positions, and includes a posture detection unit to manage discharge paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single drive motor is used to convey all rollers, then device complexity is reduced, but document stopping precision deteriorates
Solution Approach 1:
The single drive motor is segmented into multiple independent drive motors, each controlling specific rollers (feed roller, first conveyance roller, second conveyance roller). This segmentation allows independent control of each roller's rotation, enabling precise stopping positions for documents while maintaining manageable system complexity through modular motor control.
2Speed
If document conveyance is stopped immediately upon cancellation instruction, then response time is improved, but document position control deteriorates
Solution Approach 1:
The system dynamically adjusts motor operation based on real-time conditions. When a cancellation instruction is received, the control unit determines whether to stop the motor immediately or continue conveying the document based on the presence of subsequent documents and their positions. This dynamic control enables fast response when appropriate while maintaining precise position control when needed.
Solution Approach 2:
Detection units provide feedback on the presence and position of documents on the conveyance path. The control unit uses this feedback to make intelligent decisions about motor stopping timing, balancing rapid response to cancellation instructions with precise document positioning to prevent upstream documents from stopping at inconvenient locations.
3Reliability
If the motor continues driving after cancellation to discharge the current document, then document handling completeness is improved, but user time and effort increase
Solution Approach 1:
The system performs preliminary actions by detecting the presence of subsequent documents before fully stopping the conveyance process. When a cancellation instruction is received, the detection unit checks for upstream documents, and the control unit proactively stops the motor at the optimal moment to prevent these documents from reaching inconvenient stopping positions, thereby reducing user intervention time while ensuring complete document discharge.
Data Source
AI summary
An image reading device includes a con driven by a motor, determines whether or not a second document subsequent to a first document is placed in a placement unit after start of driving of the motor and after the first document reaches a reading end position where reading by a reading unit ends, and when the second document is present, stops driving of the motor if a stop instruction for sopping the document at a specific position is received, and continues driving of the motor if the stop instruction is not received, and when the second document is absent, stops driving of the motor after the first document is discharged to a downstream of the conveyance roller.