Roll Paper Conveyance Device Adherence Detection
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Solution Overview
Problem
Existing image forming apparatuses face issues with incomplete adherence of roll paper ends to the core pipe, leading to fragments being left in the conveyance path, which decreases device usability and requires significant manual effort for removal.
Innovation Solution
A rolled recording medium conveyance device with detection units and a control system that determines the adherence state of the roll paper end, conveying it in the forward or reverse direction based on detection signals to ensure proper discharge from the conveyance path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the roll paper end edge is weakly adhered to the core pipe, then the roll paper can be easily pulled out, but the end edge may come off during reverse conveyance leaving fragments in the conveyance path
Solution Approach 1:
The system performs preliminary detection of the roll end state before reverse conveyance occurs. By detecting whether the end edge is adhered or non-adhered in advance, the control unit can prepare appropriate conveyance control strategies to prevent fragment formation during the reverse conveyance process.
Solution Approach 2:
The system uses detection units to provide feedback about the roll paper end edge state (adhered or non-adhered) to the control unit. Based on this feedback, the control unit adjusts the reverse conveyance control to appropriately handle different adherence states, preventing fragment formation while maintaining ease of operation.
2Reliability
If manual removal of paper fragments is required, then complete adherence can be achieved, but device usability decreases and operational efficiency is reduced
Solution Approach 1:
The system performs self-service by automatically detecting the roll end state and controlling the reverse conveyance process to discharge end edges properly. This eliminates the need for manual intervention to remove fragments, maintaining adherence completeness while preserving operational efficiency.
Solution Approach 2:
The system replaces manual mechanical removal of fragments with an automated detection and control system. The detection units and control unit work together to automatically manage the reverse conveyance process, substituting human labor with automated mechanical and control systems.
3Reliability
If detection systems and control mechanisms are added, then proper discharge can be achieved, but device complexity increases
Solution Approach 1:
The detection units serve multiple functions: detecting the roll end state, determining adherence conditions, and providing feedback for control decisions. This multi-functionality reduces the need for separate dedicated components for each function, thereby managing device complexity while achieving reliable discharge.
Solution Approach 2:
The system merges the detection and control functions into an integrated system where the detection units and control unit work together as a unified mechanism. This integration allows for coordinated operation that achieves proper discharge accuracy while minimizing the overall system complexity.
Data Source
AI summary
In an image forming apparatus that the present invention is concerning to, rolled paper is conveyed in a forward conveyance direction for a predetermined period of time, when it is detected that an amount of the rolled paper rolled around a core pipe equals a predetermined amount or less. On the basis of the detection result, a CPU determines the rolled state of the rolled paper with respect to the core pipe and conveys the rolled paper in the forward conveyance direction or a reverse conveyance direction according to the rolled state.