Elastic Protrusion Toner Dispersing Mechanism for Image Quality
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Solution Overview
Problem
Existing developing devices face challenges in downsizing due to toner depletion issues, leading to image failures such as density unevenness and fogging, as they require frequent toner replenishment, which can disrupt the mixing properties of toner and developer, causing disturbances in the developer thin layer on the developing roller.
Innovation Solution
A toner dispersing mechanism with a rotary shaft and elastic material protrusions is introduced between the toner storage container and the developing device, effectively dispersing toner replenished from the container, ensuring it enters a dispersed state and is supplied into the developing device, thereby preventing image failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If toner is replenished from a toner storage container into a developing device, then the toner capacity is maintained for continued image formation, but the mixing property of toner and developer is deteriorated causing image failures
Solution Approach 1:
The dispersing member performs preliminary dispersion action on the replenished toner before it enters the developing device. The rotary shaft with dispersing protrusions breaks up toner clumps and distributes toner particles uniformly, ensuring proper mixing with the developer before the toner is supplied to the developing roller, thereby preventing image failures.
Solution Approach 2:
The dispersing member acts as an intermediary between the toner storage container and the developing device. It receives toner from the storage container, performs dispersion treatment, and then supplies the dispersed toner to the developing device, mediating the potential harmful effect of poor mixing.
2Reliability
If a complex mixing mechanism is added to ensure proper toner dispersion, then image quality is improved, but the device complexity increases
Solution Approach 1:
The dispersing function is localized to a specific region where toner is replenished. The dispersing member with its protrusions creates localized high-shear zones only at the toner replenishment point, providing effective dispersion without requiring a complex mixing system throughout the entire developing device.
Solution Approach 2:
The invention changes the physical parameters of the toner replenishment process by introducing a rotary dispersing member that creates mechanical agitation. The rotation speed and protrusion geometry are optimized to achieve proper dispersion, transforming the replenishment from a simple gravity-fed process to a controlled dispersion process.
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 mechanism ensures efficient toner dispersion, reducing the risk of image failures like density unevenness and fogging by ensuring proper mixing of toner and developer, allowing for effective toner replenishment and improved image formation.
Implementation Method 1
a dispersing member consisting of a rotary shaft rotatably supported in the housing and a large number of dispersing protrusions formed of an elastic material on an outer peripheral surface of the rotary shaft
Data Source
AI summary
Provided is a toner dispersing mechanism, including: a housing arranged between a toner storage container and a developing device and provided with a toner filling port communicating to the toner storage container and a toner discharge port communicating to the developing device; and a dispersing member constituted by a large number of dispersing protrusions formed of an elastic material on a rotary shaft rotatably supported in the housing and on an outer peripheral surface of the rotary shaft, in which toner replenished from the toner storage container is dispersed and discharged into the developing device.