Process Cartridge Roller Speed Ratio for Stable Toner Supply
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Solution Overview
Problem
Existing image forming apparatuses face challenges with toner supply stability and charging stability in high-temperature and high-humidity environments, leading to in-plane density differences, decreased image density, and fogging during high-speed printing.
Innovation Solution
A process cartridge design with a developing chamber featuring a developing roller and a toner supplying roller with a specific peripheral speed ratio (1.1≤R≤2.5), using toner containing silica fine particles and a crystalline resin component, and a toner regulating member to stabilize toner supply and charging, ensuring consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed printing is implemented with conventional toner supply mechanisms, then productivity increases, but toner supply stability deteriorates leading to in-plane density differences
Solution Approach 1:
The patent changes the peripheral speed ratio parameter between the developing roller and toner supplying roller to a specific range (1.05≤R≤2.5) to optimize toner supply stability at high printing speeds, preventing in-plane density differences while maintaining high productivity
Solution Approach 2:
The patent introduces dynamic speed control by making the peripheral speed ratio adjustable within a specific range rather than fixed, allowing the system to adapt to different printing conditions and maintain stable toner supply across varying speeds
2Productivity
If high-speed printing is implemented with conventional charging mechanisms, then productivity increases, but charging stability deteriorates leading to fogging and image density degradation
Solution Approach 1:
The patent modifies the charging mechanism by introducing a charging roller with specific surface resistance characteristics and positioning it at a controlled distance from the photoreceptor, enabling stable charging even at high printing speeds without fogging or image density degradation
3Ease of operation
If conventional toner formulations are used in high-temperature and high-humidity environments, then ease of operation is maintained, but image quality deteriorates with in-plane density differences and fogging
Solution Approach 1:
The patent uses a composite toner formulation combining specific resin components (polycaprolactone, polyester) with controlled particle size distribution and surface properties, creating a toner that maintains stable charging and uniform transfer characteristics in high-temperature and high-humidity environments
Solution Approach 2:
The patent adjusts toner physical parameters including particle size distribution (D10-D90), surface resistance, and composition ratios to optimize performance in harsh environmental conditions, preventing in-plane density differences and fogging
4Device complexity
If the photoreceptor is disposed below the intermediate transfer member to separate the fixing device and developing device, then device complexity is reduced and heat interference is minimized, but toner supply stability deteriorates in high-speed printing
Solution Approach 1:
The patent introduces dynamic speed control by making the peripheral speed ratio adjustable within a specific range rather than fixed, allowing the system to adapt to different printing conditions and maintain stable toner supply across varying speeds
Solution Approach 2:
The patent changes the peripheral speed ratio parameter between the developing roller and toner supplying roller to a specific range (1.05≤R≤2.5) to optimize toner supply stability at high printing speeds
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 design stabilizes toner supply and charging, preventing in-plane density differences and fogging, maintaining satisfactory image quality even under high-speed and varying environmental conditions.
Implementation Method 1
a surface of the developing roller is in contact with a surface of the toner supplying roller
Implementation Method 2
the toner contains a toner particle and a silica fine particle, the toner particle contains a crystalline resin component
Implementation Method 3
an electrophotographic photoreceptor (hereinafter, referred to as "photoreceptor") serving as an image carrying member is uniformly charged, and the charge photoreceptor is selectively exposed to light to form an electrostatic image on the photoreceptor
Implementation Method 4
image recording is performed by transferring the toner image formed on the photoreceptor to a recording material
Data Source
AI summary
The process cartridge includes a developing roller, a toner supplying roller, a toner regulating member, and a toner, a movement direction of a surface of the developing roller is opposite to a movement direction of a surface of the toner supplying roller in a position where the surface of the developing roller is in contact with the surface of the toner supplying roller, the developing roller and the toner supplying roller are formed such that a peripheral speed ratio R satisfies a range of 1.1 to 2.5, and the toner satisfying predetermined requirements is used.