Toner Transportation Device Overload Retry Control
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Solution Overview
Problem
In electrophotographic image forming apparatuses, toner cases often enter an overload state due to clumping, causing excessive load torque on driving units, which can lead to damage and require user intervention to clear, disrupting operation and convenience.
Innovation Solution
A toner transportation device with a control unit that detects overload states and performs retry control by repeatedly rotating the agitating unit forward and backward to break up clumped toner, reducing the need for user intervention and preventing driving unit damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving unit continuously drives the agitating unit without retry control, then the toner supply operation is maintained, but the driving unit may be damaged due to excessive load torque from clumped toner
Solution Approach 1:
The control unit performs preliminary detection of the driving state before damage occurs. When an abnormal state is detected (indicating toner clumping), the control unit proactively stops the driving unit and initiates retry control to rotate the agitating unit in reverse and forward directions to disperse the clumped toner, preventing driving unit damage before it happens.
2Reliability
If a warning notice is displayed to prompt user intervention, then the driving unit damage is prevented, but the user workload increases
Solution Approach 1:
The system performs self-diagnosis and self-correction. When toner clumping is detected through abnormal driving state monitoring, the control unit automatically executes retry control by rotating the agitating unit in reverse and forward directions to disperse the clumped toner, eliminating the need for user intervention and maintaining ease of operation while protecting the driving unit.
3Reliability
If the agitating unit is rotated repeatedly forward and backward to clear overload, then the toner clumping is resolved, but the operation time increases
Solution Approach 1:
The retry control implements periodic rotation of the agitating unit, alternating between reverse rotation (to separate clumped toner) and forward rotation (to restore normal toner supply). This periodic action efficiently clears overload states by leveraging the mechanical effect of bidirectional rotation while minimizing the total time required compared to continuous operation or manual intervention.
Data Source
AI summary
A toner transportation device includes a toner case and a drive section. The toner case includes a main body containing toner, and an agitating unit rotatably mounted in the main body that agitates the toner. The drive section includes a driving unit driving the agitating unit, a detection unit detecting a driving unit driving state, and a control unit able to transmit a drive instruction signal to the driving unit and receive a detection signal regarding the driving unit driving state from the detection unit. The control unit determines whether the toner case is in an overload state in accordance with a detection signal reception state. The control unit performs a retry control, causing the driving unit to repeatedly rotate the agitating unit forward and backward when the control unit determines that the toner case is in an overload state.