Dynamic Threshold Adjustment for Jam Detection in Image Forming Systems
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Solution Overview
Problem
Existing image forming systems face issues with detecting jams when papers are conveyed overlapping each other during automatic purging, leading to erroneous jam detection and increased load on users due to timing lags in communication between devices.
Innovation Solution
The system includes a detector that adjusts the jam detection threshold based on the size of the recording material and cycle time, allowing for proper automatic purging by changing the threshold value when re-conveyance occurs, ensuring accurate detection and preventing false jam alarms during overlapping paper conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the first threshold value is used for jam detection during automatic purging, then jam detection sensitivity is improved, but false jam detection occurs when papers are conveyed overlapping each other
Solution Approach 1:
The threshold value is dynamically changed based on the conveyance state. During automatic purging, when papers may be conveyed overlapping, the threshold is temporarily increased to the second threshold value. When normal conveyance occurs, the first threshold value is used. This dynamic adjustment allows the system to maintain high detection sensitivity during normal operation while avoiding false detections during automatic purging.
Solution Approach 2:
The detection parameter (threshold value) is changed from the first threshold value to the second threshold value based on the operational phase. The controller identifies when automatic purging is occurring and adjusts the threshold parameter accordingly, changing the detection characteristics to match the current conveyance mode and prevent erroneous jam detection.
2Stability of the object's composition
If communication timing is synchronized between devices, then system coordination is improved, but time lag in jam notification causes papers to overlap during stopping
Solution Approach 1:
The controller performs preliminary action by temporarily stopping the conveyance mechanism before the actual jam detection and notification process completes. This preemptive stopping prevents downstream papers from overlapping with upstream papers during the communication time lag, ensuring that when the stop command is finally executed, papers are already positioned without overlap.
3Ease of operation
If automatic purging is performed continuously, then user workload is reduced, but papers may overlap and cause erroneous jam detection
Solution Approach 1:
The detection threshold is dynamically adjusted based on the operational mode. During automatic purging operations, the system switches to the second threshold value that accounts for overlapping paper conveyance. This allows automatic purging to continue providing user convenience while the adapted threshold prevents false jam detection during this specific operation.
Data Source
AI summary
An image forming system detects a first conveyance abnormality of a recording material when a time taken for the recording material conveyed along a conveyance path in the image forming system to pass a predetermined position exceeds a first threshold value, temporarily stops the conveyance of the recording material when the first conveyance abnormality is detected and changes the first threshold value to a second threshold value larger than the first threshold value when the conveyance of the recording material is temporarily stopped, and detects a second conveyance abnormality based on the second threshold when a re-conveyance is made to eject the recording material remaining in the conveyance path.