Developing Cartridge Conveying Mechanism for Uniform Agent Mixing
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Solution Overview
Problem
In image forming apparatuses, the horizontal tandem-type system faces issues with the length and quality of images due to the accumulation of deteriorated developing agent in the developing chamber, leading to reduced fluidity and charging function, causing defects like background fogging and scattered printing.
Innovation Solution
A developing device with a partitioned developing chamber and storage chamber, equipped with conveying units that circulate the developing agent between ends, ensuring uniform mixing of fresh and non-fresh agent, preventing accumulation and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the developing agent storage chamber is located above the developing chamber to reduce device length, then the device dimension in the alignment direction is reduced, but the developing agent accumulates at longitudinal end portions causing image quality deterioration
Solution Approach 1:
The developing device is segmented into multiple functional regions: a developing agent storage chamber (first chamber) and a developing chamber (second chamber), with each having dedicated conveying mechanisms. The first conveying unit supplies fresh developing agent to the second chamber, while the second conveying unit removes deteriorated agent, enabling independent control of agent flow in each region to prevent end-portion accumulation.
Solution Approach 2:
Instead of allowing developing agent to flow only downward by gravity from storage to developing chamber, the invention introduces a reverse flow mechanism where the second conveying unit actively removes deteriorated agent from the developing chamber back toward the storage chamber or discharge path, creating a circular flow that prevents accumulation at end portions.
2Quantity of substance
If fresh developing agent is continuously supplied downwardly from the storage chamber, then the developing chamber maintains adequate agent supply, but deteriorated agent accumulates at longitudinal end portions of the developing roller
Solution Approach 1:
The invention establishes continuous dual-directional conveying action: the first conveying unit continuously supplies fresh developing agent to the developing chamber, while the second conveying unit simultaneously and continuously removes deteriorated agent. This continuous bidirectional flow ensures that agent supply is maintained while preventing accumulation, creating an ongoing useful action that addresses both requirements.
Solution Approach 2:
The second conveying unit functions to discard deteriorated developing agent from the developing chamber, removing it from the image-forming process. The system recycles or properly disposes of this deteriorated agent while continuously replenishing fresh agent through the first conveying unit, maintaining agent quality in the developing chamber.
3Reliability
If the developing agent is subjected to sliding friction during charging, then the developing agent can be charged to the photosensitive element, but the developing agent deteriorates causing reduced fluidity and charging function
Solution Approach 1:
The second conveying unit extracts and removes deteriorated developing agent from the developing chamber before it can further degrade or cause image defects. By taking out the deteriorated agent that has undergone excessive sliding friction and charging cycles, the system prevents further deterioration and maintains the reliability of the remaining agent.
Solution Approach 2:
The dual-conveying system creates a feedback mechanism where the state of developing agent (fresh vs. deteriorated) determines its flow direction and residence time. Fresh agent is fed into the chamber, undergoes controlled charging, and deteriorated agent is automatically removed, creating a self-regulating system that maintains agent quality and extends effective service life.
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
The solution effectively suppresses the accumulation of deteriorated agent, enhancing the quality of images formed on photosensitive elements and recording sheets by maintaining the developing agent's fluidity and charging function.
Implementation Method 1
a first conveying unit that is provided within the developing agent storage chamber and that is configured to convey a developing agent from one end of the developing agent storage chamber to the other end
Implementation Method 2
The developing device disclosed in JP-A-2001-166556 can use gravity to downwardly move the developing agent from the developing agent storage chamber to the developing chamber
Data Source
AI summary
A developing device includes: a first conveying unit provided within a developing agent storage chamber and that is configured to convey developing agent from one end of the developing agent storage chamber to another end of the developing agent storage chamber in a longitudinal direction of a developing agent carrier that is disposed with in a developing chamber and to supply the developing agent from the developing agent storage chamber to the developing chamber; a second conveying unit provided within the developing chamber and that is configured to convey the developing agent from the other end of the developing chamber to the one end of the developing chamber in the longitudinal direction and to supply the developing agent toward a developing agent carrier; and a third conveying unit provided between the one end of the developing agent storage chamber and the one end of the developing chamber.