Image Forming Apparatus Toner Path Switching After Conveyance Errors
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Solution Overview
Problem
Existing image forming apparatuses experience interruptions in toner replenishment due to conveyance errors in developing devices, which can disrupt continuous image formation.
Innovation Solution
The image forming apparatus is equipped with a developing device, a container, a toner replenishment device, and a control portion that includes multiple toner replenishment paths and detection mechanisms to detect conveyance errors, allowing the control portion to switch to an alternate path in case of an error, ensuring uninterrupted toner supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single toner replenishment path is used, then the device complexity is reduced, but the reliability of toner replenishment decreases due to conveyance errors
Solution Approach 1:
The toner replenishment device is divided into multiple independent toner replenishment paths (first path with first conveyance member, second path with second conveyance member). Each path can operate independently, so when one path encounters a conveyance error, the other path can continue to supply toner, thereby improving reliability without requiring a complete system redesign.
Solution Approach 2:
The system changes the operational state of different toner replenishment paths based on detected conveyance errors. When a conveyance error is detected in one path, the control portion switches to use the other path, dynamically adjusting which path is active to maintain reliable toner supply.
2Productivity
If multiple toner replenishment paths are provided, then the reliability of continuous image formation is improved, but the device complexity increases
Solution Approach 1:
The toner replenishment device is divided into multiple independent toner replenishment paths (first path with first conveyance member, second path with second conveyance member). Each path can operate independently, so when one path encounters a conveyance error, the other path can continue to supply toner, thereby improving reliability without requiring a complete system redesign.
Solution Approach 2:
The toner conveyance detection portion automatically detects conveyance errors in each path, and the control portion automatically switches between paths based on detection results. This self-monitoring and self-switching mechanism enables continuous operation without manual intervention, maintaining productivity while managing the complexity of multiple paths.
3Reliability
If toner conveyance error detection is implemented, then interruptions in toner replenishment are suppressed, but the device complexity and cost increase
Solution Approach 1:
The toner conveyance detection portion continuously monitors the conveyance status of toner in each path and provides feedback to the control portion. When a conveyance error is detected, the control portion receives this feedback and automatically switches to an alternative path, creating a closed-loop control system that suppresses interruptions while managing detection system complexity.
Solution Approach 2:
The system performs preliminary detection of conveyance errors before they cause complete toner replenishment failure. By detecting errors early and switching paths proactively, the system prevents interruptions in toner supply to the developing device, maintaining reliability while using a relatively simple detection mechanism.
Data Source
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AI summary
An image forming apparatus (1) includes a developing device (40), a container (50), a toner replenishment device (60), a toner conveyance detection portion (46, 71, 81), and a control portion (8). The toner replenishment device (60) includes a plurality of toner replenishment paths (R1, R2) through which toner in the container (50) is conveyed and replenished to the developing device (40). The toner conveyance detection portion (46, 71, 81) detects a toner conveyance error in toner conveyance performed by using the plurality of toner replenishment paths (R1, R2). In a case where the toner conveyance detection portion (46, 71, 81) has detected a toner conveyance error in one of the toner replenishment paths (R1, R2) that is in use, the control portion (8) switches to another one of the toner replenishment paths (R1, R2) to convey the toner.