Developer Stirring Control via Real-Time Toner Density Feedback
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Solution Overview
Problem
Existing image forming devices face issues with image density defects and smoke generation due to changes in developer bulk density caused by transit and storage environments, which are not adequately addressed by fixed initial stirring operations.
Innovation Solution
An image forming device with a hardware processor that performs an initial stir operation of the developer, obtains a reference toner density value set at the factory shipment, and compares it with the current toner density to determine the stir condition, ensuring the developer is loosened to a condition equivalent to that at the factory shipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed initial stirring operation time is set in advance, then the setup process is simple, but the developer may not be loosened sufficiently when bulk density change is large
Solution Approach 1:
The system continuously monitors toner density during the stirring operation and uses this feedback to dynamically adjust the stirring time. The hardware processor compares real-time toner density measurements with reference values and extends the stirring operation until the developer reaches the desired loosening condition, ensuring reliable results while maintaining operational simplicity.
2Reliability
If a long initial stirring operation time is set to ensure developer loosening, then the developer is sufficiently loosened, but the setup time at the customer site increases
Solution Approach 1:
The system uses real-time toner density monitoring to determine when the developer has been sufficiently loosened. The hardware processor compares current toner density measurements with reference values and stops the stirring operation once the desired condition is achieved, avoiding unnecessary extended operation time and reducing setup time while ensuring reliable developer loosening.
Solution Approach 2:
The system dynamically adjusts the stirring operation parameters (time, speed) based on real-time toner density measurements. The hardware processor modifies the stirring parameters adaptively during the operation to achieve the desired developer condition with minimal time, optimizing the balance between loosening effectiveness and setup time.
3Device complexity
If the initial stirring operation is performed for a fixed time, then the process is easy to control, but the device cannot be used for a long time after setup
Solution Approach 1:
The system uses continuous toner density monitoring to determine when the developer has been sufficiently loosened. The hardware processor compares real-time measurements with reference values and automatically terminates the stirring operation once the desired condition is achieved, enabling the device to be put into service sooner while maintaining simple control through automated feedback-based decision making.
Data Source
AI summary
An image forming device to and from which a developing unit in which a developer containing toner is filled is detachable and removable, comprises a hardware processor that: enables the developing unit to perform a stir operation of the developer filled in the developing unit as an initial operation of the developing unit; obtains a reference value of a toner density set in advance in time of a factory shipment of the developing unit at time the stir operation is performed; and compares a toner density received from the developing unit during the stir operation with the reference value to determine a stir condition of the developer.