Dual Developer Storage System for Continuous Image Formation
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in maintaining stable developer delivery to the developing apparatus, leading to frequent cartridge replacements and potential toner density fluctuations, especially with increased operational speed and usage, which results in downtime and reduced efficiency.
Innovation Solution
The apparatus incorporates a dual developer storage system with a first and second developer accommodating portion, each with detection mechanisms and supplying devices, controlled by a controller to maintain predetermined developer levels, allowing continuous operation until the second storage is depleted, thus reducing cartridge replacement frequency and maintaining stable toner delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a single developer cartridge is used with conventional storage capacity, then the device complexity is low and ease of operation is good, but the continuous operation time is limited and cartridge replacement frequency is high
Solution Approach 1:
The developer storage system is segmented into multiple independent accommodating portions (first and second developer accommodating portions), each capable of storing developer separately. This segmentation allows the system to extend continuous operation time by utilizing multiple storage units while maintaining manageable complexity through modular design, where each portion can be independently controlled and monitored.
Solution Approach 2:
The patent implements a nested storage structure where the first and second developer accommodating portions are integrated within the developer dispensing apparatus. The second accommodating portion is positioned to receive developer from the first portion, creating a nested supply chain that extends operational duration without requiring completely separate systems.
2Duration of action of moving object
If developer is delivered directly from cartridge to developing apparatus, then the delivery amount is stable, but the continuous operation time is limited due to frequent cartridge replacements
Solution Approach 1:
The patent introduces intermediate storage portions (first and second developer accommodating portions) as mediators between the developer cartridge and the developing apparatus. These intermediaries receive developer from the cartridge and supply it to the developing apparatus, thereby extending continuous operation time while maintaining stable toner density through controlled delivery mechanisms that regulate the intermediary storage and release processes.
3Duration of action of moving object
If the developer storage capacity is increased to extend operation time, then the continuous operation time increases, but the ease of operation decreases due to larger cartridge size and replacement difficulty
Solution Approach 1:
Instead of using a single large developer cartridge, the system segments the storage into multiple smaller accommodating portions within the apparatus. This segmentation maintains ease of operation by using standard-sized cartridges that are easy to replace, while extending continuous operation time through the combined capacity of multiple storage portions and the second portion's reserve supply.
Solution Approach 2:
The system performs preliminary action by pre-loading the first and second developer accommodating portions with developer before the cartridge is fully depleted. This allows the apparatus to continue operating smoothly without sudden interruptions or requiring large cartridge replacements, maintaining ease of operation while extending continuous operation time through advance preparation of developer supply.
Data Source
AI summary
An image forming apparatus includes a controller for controlling, when a developer is accommodated in a developing container, a discharging device such that an amount of developer in a first accommodating portion is not less than a first amount, in accordance with a detection result of a first detecting device and such that an amount of developer in a second accommodating portion is not less than a second amount, in accordance with a detection result of a second detecting device, and for permitting, when the developing container is substantially empty, and the amount in the first accommodating portion is less than the first amount, an image forming operation to continue until the amount in the second developer portion becomes less than the second amount.