Paper Conveyance Device Controller for Roller Life Extension
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Solution Overview
Problem
Existing paper conveyance devices face issues with paper feed roller idling due to erroneous detection, leading to decreased roller life and ineffective prevention of abrasion, as they rely on retry mechanisms that do not adequately address the root cause of idling caused by erroneous sensor detection.
Innovation Solution
A paper conveyance device with a controller that switches between normal and safe paper feed modes, adjusting the timing of paper drawing and conveying based on sensor detection outputs to minimize idling and extend roller life, by setting a delay time after detection switching and standby periods to ensure accurate paper presence detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retry mechanisms are used to handle paper feed detection failures, then paper feed reliability is improved, but paper feed roller idling increases and roller life decreases
Solution Approach 1:
The system dynamically switches between normal mode and safe paper feed mode based on detection results. In normal mode, standard paper feed timing is used for high productivity. When detection uncertainty is detected (standby time exceeds threshold), the system transitions to safe paper feed mode with delayed timing, dynamically adapting to maintain reliability while minimizing unnecessary idling and preserving roller life.
Solution Approach 2:
The invention changes the paper feed timing parameter based on detection outcomes. By adjusting the feed timing from normal timing to delayed timing (safe paper feed mode) when detection uncertainty occurs, and changing back to normal timing when confidence is restored, the system optimizes the balance between reliability and roller protection without permanent parameter changes.
2Measurement precision
If delayed paper feed timing is used to ensure accurate detection, then detection accuracy is improved, but paper feed productivity decreases
Solution Approach 1:
The system dynamically adjusts feed timing based on real-time detection confidence. Instead of using fixed delayed timing for all cases, the system operates in normal mode (high productivity) when detection is confident and only switches to safe paper feed mode (delayed timing, lower productivity) when detection uncertainty is detected, thus maintaining high overall productivity while ensuring accuracy when needed.
Solution Approach 2:
The invention applies delayed timing (excessive action) only partially - specifically when detection uncertainty is detected - rather than continuously. This partial application of delayed timing ensures detection accuracy is improved only when necessary, while maintaining normal productivity during confident detection periods.
Data Source
AI summary
A paper conveyance device includes a roller, paper feed sensor, registration sensor, and controller. At a first time point at which specified time from start of draw of paper by the roller to arrival of the paper at the registration sensor has passed, when a detection result by the registration sensor is absence of the paper and a detection result by the paper feed sensor is presence of the paper, and the detection result by the paper feed sensor is the absence at a second time point at which standby time has passed from the first time point, the controller sets a safe paper feed mode in which the draw of the paper by the roller is started at a delay time point at which delay time has passed since a switching time point at which the detection result by the registration roller is switched from the presence to absence.