Developer Supply Control for Uniform Toner Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming apparatuses face challenges in maintaining uniform developer density in the developing area, leading to inconsistent image quality due to inadequate developer supply and mixing, resulting in scatter and poor electrification.
Innovation Solution
An image forming apparatus with a developing cartridge, sensor, and control system that monitors and adjusts the developer supply to maintain a predetermined space occupancy of 55-65% within the cartridge, ensuring optimal developer distribution and electrification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the developer supply amount is increased to ensure sufficient developer in the developing area, then the developer quantity is improved, but the developer density uniformity deteriorates due to excessive supply
Solution Approach 1:
The patent employs a sensor to detect the actual amount of developer in the developing cartridge and feeds this information back to a control unit. The control unit adjusts the developer supply amount based on the detected value, maintaining the developer amount within a predetermined range. This closed-loop feedback mechanism ensures sufficient developer quantity while preventing over-supply that would cause density non-uniformity.
2Manufacturing precision
If the developer supply amount is decreased to maintain uniform developer density, then the developer density uniformity is improved, but the developer quantity becomes insufficient leading to scatter
Solution Approach 1:
The sensor continuously monitors the developer amount and provides feedback to the control unit. When the developer amount approaches the lower limit of the predetermined range, the control unit increases or maintains the supply amount to prevent insufficiency. This ensures adequate developer quantity is maintained while avoiding excessive supply that would compromise density uniformity.
3Productivity
If the developer supply is increased for fast printing, then the productivity is improved, but the electrification quality deteriorates due to insufficient mixing time
Solution Approach 1:
The patent dynamically adjusts the developer supply amount based on actual consumption rates and printing conditions. The control unit modifies the supply rate in real-time to match consumption, ensuring that developer is supplied at an optimal rate that maintains both high productivity and proper electrification quality through adequate mixing time.
4Device complexity
If a fixed default value for developer supply is used, then the device complexity is reduced, but the adaptability to different printing conditions deteriorates
Solution Approach 1:
Instead of using a fixed default supply value, the patent implements a feedback-based control system that automatically adjusts the developer supply amount according to actual consumption and printing conditions. This adaptive approach maintains low user-side complexity while achieving high adaptability through automated sensor-based regulation.
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 ensures uniform developer density and improved agitating and electrifying efficiency, resulting in enhanced image quality by maintaining the optimal space occupancy range of 55-65% in the developing cartridge.
Implementation Method 1
a sensor for detecting an amount of the developer in the developing cartridge
Implementation Method 2
The magnetic bar 19 is disposed at upper and lower outsides of the opening 11a to adsorb the developer scattered in the developing area A
Implementation Method 3
The fixing magnet 15 is mounted within the developing sleeve 14 and has a tubular form divided into a plurality of sections. The fixing magnet 15 has a magnetic pole N1 opposite to the developing area A
Implementation Method 4
The two-property developer is a mixture of toner and carrier in a predetermined ratio. The carrier is attached on a surface of a developing sleeve by a magnetic force of the developing sleeve, and the toner is attached by surrounding static electricity
Data Source
AI summary
An image forming apparatus and method including a developing cartridge mounted in a main body of the image forming apparatus to receive a developer with a certain space occupancy of the developer with respect to an inner capacity thereof; a developer supply part connected to the developing cartridge to supply the developer; a sensor for detecting an amount of the developer in the developing cartridge; and a control part for controlling the developer supply part to restrict an amount of the developer for supply to the developing cartridge according to the amount of the developer detected by the sensor, thereby maintaining the space occupancy of the developer in the developing cartridge. Accordingly, the developer supplied to the developing cartridge can be in a certain range of space occupancy during printing, and as a result, density of the developer in a developing area can be uniform.