Toner Supply Control Using Drive Time Counter and Sensor Data
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Solution Overview
Problem
In electrophotographic image forming apparatuses, the existing toner remaining amount sensors cause unnecessary forcible toner supply when the toner cartridge is empty, leading to reduced photoreceptor life and user inconvenience, especially during power-on and wake-up from sleep mode.
Innovation Solution
The implementation of a control system that combines toner remaining amount sensor data with a drive time counter to accurately determine toner levels, preventing erroneous forcible toner supply operations and optimizing toner usage by integrating memory systems on both the image forming unit and toner cartridge sides to manage thresholds and display messages for user notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If forcible toner supply is performed when toner empty becomes definite, then toner supply reliability is improved, but photoreceptor life is reduced due to unnecessary supply operations
Solution Approach 1:
The system performs preliminary toner supply operations before the toner cartridge is completely empty, based on drive time counter data. By predicting when toner will be depleted and supplying toner in advance, the system ensures continuous operation while avoiding unnecessary supply operations after the cartridge is actually empty, thus preserving photoreceptor life.
Solution Approach 2:
The control system uses feedback from both the toner remaining amount sensor and the drive time counter to dynamically adjust toner supply timing. The drive time counter provides predictive feedback about future toner depletion, while the sensor provides actual status feedback, allowing the system to optimize supply operations and avoid unnecessary photoreceptor exposure.
2Reliability
If forcible toner supply is performed at power-on and wake-up from sleep mode, then toner availability is ensured, but user wait time increases due to unnecessary supply operations
Solution Approach 1:
The system performs toner supply operations in advance during normal operation based on drive time accumulation, so that when power is turned on or the system wakes from sleep mode, the toner cartridge is already replenished and ready for immediate use, eliminating user wait time while ensuring toner availability.
Solution Approach 2:
The toner supply timing is made dynamic rather than fixed. Instead of always performing supply operations at power-on or wake-up events, the system adapts the supply timing based on actual drive time counter data and predicted toner depletion patterns, allowing supply operations to occur at optimal moments that minimize user impact while ensuring readiness.
3Device complexity
If toner remaining amount sensor is used alone to determine toner levels, then detection simplicity is maintained, but measurement precision is reduced leading to erroneous supply operations
Solution Approach 1:
The system merges the toner remaining amount sensor data with drive time counter data to create a more accurate picture of toner levels. The sensor provides real-time actual toner status while the drive time counter provides predictive information about consumption patterns, and the control system integrates both data sources to make precise supply decisions, eliminating erroneous operations.
Data Source
AI summary
An image forming apparatus includes an image forming unit including a developing device, a toner cartridge to supply toner to the developing device, a toner remaining amount sensor to detect a toner remaining amount in the developing device, a toner use amount detection mechanism to detect a parameter value for obtaining a use amount of toner, a first memory which is provided in the toner cartridge and to which a threshold of the parameter indicating a near empty state is previously inputted, and a control mechanism which determines necessity of a forcible toner supply operation based on a comparison between the detected parameter value and the threshold, and the toner remaining amount detected by the toner remaining amount sensor, and controls the image forming unit.