Developing Apparatus Counter Blade Discharge Path Control
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Solution Overview
Problem
Developing apparatuses face the challenge of excessive developer discharge due to increased internal pressure, leading to unintentional discharge of developer through the developer discharge hole.
Innovation Solution
The developing apparatus incorporates a design with a first and second case part, a developing roller, and carrying members with a counter blade and a discharge path that narrows stepwise or continuously towards the discharge hole, along with a magnet to retain the developer, ensuring controlled discharge and minimizing air flow towards the discharge hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a developer discharge hole is provided in the developer accommodation chamber, then old developer can be discharged, but excessive developer discharge occurs due to increased internal pressure causing unintentional discharge through the discharge hole
Solution Approach 1:
The discharge path cross-sectional area is locally varied along the discharge direction, creating a gradient from larger area near the carrying member to smaller area near the discharge hole. This localized geometric modification controls developer flow characteristics and prevents unintentional discharge while maintaining reliable old developer discharge functionality.
Solution Approach 2:
The invention introduces a dimensional variation in the discharge path by changing the cross-sectional area along the discharge direction. This spatial dimensionality change creates a controlled flow path that restricts developer discharge under high pressure conditions while allowing normal discharge operations.
2Loss of substance
If the discharge path cross-sectional area is decreased towards the discharge hole, then unintentional developer discharge is suppressed, but the discharge path becomes more complex
Solution Approach 1:
Rather than making the entire discharge path complex, only the cross-sectional area varies along the discharge direction while maintaining a simple overall structure. The carrying member geometry is locally adjusted to create the area gradient, keeping the design simple yet effective for suppressing unintentional developer discharge.
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 design effectively suppresses excessive developer discharge by altering the discharge path's cross-sectional area and utilizing magnetic forces to retain the developer, thereby reducing unintentional discharge and maintaining efficient operation.
Implementation Method 1
a magnet to retain the developer, ensuring controlled discharge and minimizing air flow towards the discharge hole
Data Source
AI summary
A developing apparatus capable of suppressing an excessive discharge of developer from a developer discharge hole is disclosed. A first opening part through which developer is carried from a first case part to a second case part, and a developer discharge hole through which the developer is discharged are provided to the first case part. A first carrying member includes a counter blade between the first opening part and the developer discharge hole. The counter blade carries the developer in an opposite direction to a carrying direction of a first carrying blade of the first carrying member. A gap is prepared between an upper part of the counter blade and the first case part. A cross-sectional area of a discharge path for the developer from the counter blade to the developer discharge hole changes according to a progress of the developer along the discharge path.