Dynamic Jam Detection Threshold for Transport Rollers
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Solution Overview
Problem
In sheet-feed image read apparatuses, the existing jam detection methods based on motor drive load thresholds can be inefficient, leading to delayed detection of medium jams, especially when a small number of transport roller pairs are engaged, which can result in prolonged exposure and potential damage to the medium and the transport mechanism.
Innovation Solution
A medium transport apparatus with a controller that dynamically adjusts the jam detection threshold based on the number of transport roller pairs engaged, using detection information from multiple detectors to set a higher threshold for more roller pairs and a lower threshold for fewer roller pairs, thereby reducing the likelihood of prolonged exposure to jam conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed threshold is set based on the maximum number of transport roller pairs, then the threshold is appropriate when maximum roller pairs are engaged, but the drive load excessively differs from the threshold when minimum roller pairs are engaged, causing delayed jam detection
Solution Approach 1:
The threshold is changed from a fixed value to a dynamic value that varies based on the number of engaged transport roller pairs. The controller adjusts the threshold in real-time according to the actual operating conditions, ensuring optimal jam detection sensitivity across different operational states.
Solution Approach 2:
The system uses feedback from detectors that monitor the number of engaged transport roller pairs to dynamically adjust the threshold. This closed-loop control ensures the threshold always matches the current operational state, preventing both false positives and delayed detection.
2Device complexity
If a single motor drives multiple transport roller pairs, then the system structure is simplified, but the drive load varies significantly depending on how many roller pairs are transporting the medium
Solution Approach 1:
The threshold parameter is changed to be adaptive rather than fixed. The controller modifies the threshold value based on the number of engaged roller pairs, allowing the system to maintain high detection accuracy across varying operational conditions without changing the physical motor configuration.
Data Source
AI summary
A medium transport apparatus includes a controller that determines how many transport roller pairs disposed on a medium transport route are transporting a medium, based on detection information from detectors disposed in relation to respective transport roller pairs. Then, the controller sets a threshold to a larger value as a larger number of transport roller pairs are transporting the medium and sets the threshold to a lower value as a smaller number of transport roller pairs are transporting the medium.