Toner Cartridge Sensor for Uneven Distribution Control
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Solution Overview
Problem
The existing image forming apparatuses face challenges in determining the state of a toner cartridge, particularly when the toner distribution becomes uneven, leading to abnormal operation and reduced toner supply to the developing device, due to the inability to detect changes in the transporting member's rotation and density distribution.
Innovation Solution
An inductance-variable sensor is used to monitor the transporting member's rotation and density changes, generating output signals that indicate the toner cartridge's state. Based on these signals, the apparatus determines if the cartridge is in a normal or abnormal state and executes a recovery mode by increasing the driving force to redistribute the toner, ensuring consistent supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the toner cartridge operates without monitoring, then the device complexity is reduced, but the reliability of toner supply deteriorates due to uneven toner distribution
Solution Approach 1:
The patent replaces complex mechanical monitoring systems with a magnetic field-based detection system. A sensor detects changes in magnetic field strength caused by variations in toner distribution around the transporting member, enabling non-contact monitoring of toner cartridge state without adding mechanical complexity.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary to indirectly measure toner distribution. Instead of directly monitoring toner position, the system uses magnetic field strength variations as a mediator to infer toner distribution state, simplifying the monitoring mechanism while improving reliability.
2Measurement precision
If the transporting member rotation is monitored continuously, then the measurement precision of toner distribution is improved, but the use of energy increases
Solution Approach 1:
The patent implements periodic monitoring of the transporting member's magnetic field characteristics at specific intervals during rotation, rather than continuous monitoring. This approach maintains sufficient measurement precision for detecting toner distribution issues while significantly reducing the energy consumption of the sensor system.
3Productivity
If the toner distribution is corrected by increasing driving force, then the productivity of toner supply is improved, but the force applied to transporting member increases
Solution Approach 1:
The patent implements a feedback control system where the sensor continuously monitors magnetic field strength variations indicating toner distribution. When uneven distribution is detected, the system provides feedback to adjust the transporting member's rotation speed or driving force, correcting toner supply consistency while minimizing unnecessary force application through precise, demand-based control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for real-time monitoring and correction of toner distribution, preventing abnormal supply issues and maintaining consistent image forming operations by identifying and addressing uneven toner distribution within the toner cartridge.
Implementation Method 1
An inductance-variable sensor is used to monitor the transporting member's rotation and density changes, generating output signals that indicate the toner cartridge's state
Data Source
AI summary
An example operation method of an image forming apparatus includes obtaining, from a sensor, an output signal corresponding to a degree of shrinkage of a transporting member that transports a developing agent in a toner cartridge, as the transporting member rotates, determining a state of the toner cartridge based on a characteristic of the output signal, and executing a recovery mode that increases a driving force delivered to the transporting member when determining that the state of the toner cartridge is an abnormal state in which toner is not normally supplied to a developing device.