Toner Mixture Ratio Control for Copier Reliability
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Solution Overview
Problem
Color printers face issues with toner deterioration and reduced productivity due to low usage frequencies of cyan, magenta, and yellow toners, leading to damaged cleaning blades and accumulated deteriorated toner in the developing unit, which affects image quality and requires frequent forcible discharge, disrupting continuous printing.
Innovation Solution
An image forming apparatus with a data obtainer and image data converter that calculates and adjusts toner consumption and mixture ratios to prevent toner deterioration by mixing cyan, magenta, and yellow toners with black toner, increasing the K toner mixture ratio when toner insufficiency occurs, ensuring black is expressed through a combination of four colors, thereby reducing the need for forcible toner discharge and maintaining print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frequency of use of C, M, and Y toners is low, then the cleaning blades for C, M, and Y are damaged, but increasing the usage frequency requires mixing C, M, and Y toners with K toner which increases device complexity
Solution Approach 1:
The system dynamically changes the toner mixture ratio parameters by calculating the usage frequency of each color toner and adjusting the mixing proportions accordingly. When C, M, or Y toner usage is low, the system increases their mixing ratio with K toner to ensure sufficient toner supply and prevent cleaning blade damage, while maintaining the overall black tone quality.
Solution Approach 2:
The system implements a feedback mechanism by monitoring the usage frequency of each color toner during printing operations. Based on this feedback, the controller automatically adjusts the toner mixing ratios in real-time to prevent low-usage toners from being depleted too quickly, thereby protecting cleaning blades from damage caused by toner insufficiency.
2Reliability
If the developing unit stirs toner for extended periods to prevent deterioration, then toner is damaged, but reducing stirring time leads to deteriorated toner accumulation
Solution Approach 1:
Instead of continuous stirring, the system employs periodic stirring actions at optimized intervals. The developing unit stirs toner only when necessary based on printing conditions and toner consumption patterns, minimizing unnecessary stirring that causes toner damage while still preventing deteriorated toner accumulation through timely periodic mixing.
Solution Approach 2:
The stirring operation transitions from a static fixed-time approach to a dynamic adaptive approach. The system adjusts stirring duration and frequency based on real-time printing conditions, toner consumption rates, and developing unit state, optimizing the balance between preventing toner deterioration and avoiding excessive stirring damage.
3Reliability
If forcible discharge of deteriorated toner is executed, then toner accumulation is prevented, but continuous printing is intermitted reducing productivity
Solution Approach 1:
The system performs preliminary actions by proactively managing toner consumption and stirring patterns to prevent deteriorated toner accumulation in the first place. Through optimized toner mixing ratios and adaptive stirring control, the system maintains toner quality without requiring frequent forcible discharge operations, thus avoiding interruptions to continuous printing.
4Reliability
If the K toner mixture ratio is increased to prevent toner insufficiency, then toner supply stability is improved, but the hue of black may be affected
Solution Approach 1:
The system dynamically adjusts the K toner mixture ratio as a variable parameter based on actual printing conditions and toner consumption patterns. Rather than using a fixed high mixture ratio, the controller optimizes the K toner proportion to maintain stable toner supply while preserving accurate black tone reproduction, making minimal adjustments to the mixture ratio only when necessary.
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 approach reduces the accumulation of deteriorated toner, decreases the frequency of forcible toner discharge, and enhances printing productivity by effectively managing toner usage and mixture ratios, ensuring consistent image quality.
Implementation Method 1
a developing unit that stirs toners of C, M, Y and K to be supplied to the electrostatic latent image carrier
Implementation Method 2
an electrostatic latent image carrier where an electrostatic latent image corresponding to the image data of the CMYK system generated by the image data converter is formed
Data Source
AI summary
In a copier having an image data converter that sets the C density, the M density and the Y density to a density obtained by multiplying the density of black in the RGB system by a CMY mixture ratio and sets the K density to a density obtained by multiplying the density of black by a K mixture ratio when black in the RGB system is converted into the CMYK system, the image data converter sets the K mixture ratio to a K reference mixture ratio when TK<PHK, and sets the K mixture ratio to a K high mixture ratio that is higher than the K reference mixture ratio when TK≧PHK. Here, TK is a K toner amount of consumption insufficiency which is a K toner amount to be consumed to prevent toner deterioration at the driving amount of the developing unit, and PHK is a K high predetermined value.