Developer Supply Path Pressure Balancing in Image Forming Units
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Solution Overview
Problem
Existing image forming apparatuses face challenges in efficiently supplying and managing developers to ensure consistent toner image formation across multiple image forming units, particularly when different types of developers are used, leading to potential inconsistencies and inefficiencies.
Innovation Solution
The image forming apparatus employs a developing device with a unique developer supply system that includes a rotating body and transport members to manage developers, along with a separate developer storage container and supply mechanism that stabilizes developer flow and pressure management, ensuring consistent developer supply to each image forming unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a partition plate with opening portions is used to divide the developer storage portion, then developer supply to multiple image forming units is enabled, but pressure fluctuations and developer leakage occur
Solution Approach 1:
A pressurizing member (spring) is introduced as an intermediary element between the developer storage portions to maintain pressure equilibrium. This spring-loaded mechanism acts as a mediator that absorbs pressure fluctuations and prevents developer leakage while enabling supply to multiple image forming units through the partition plate openings.
Solution Approach 2:
The system changes the pressure parameter dynamically by incorporating a pressurizing member that can adjust and maintain optimal pressure levels. This allows the developer supply system to adapt pressure conditions to prevent leakage while ensuring consistent supply to multiple developing devices.
2Adaptability or versatility
If developer storage portion is divided into multiple sections, then different developer types can be stored, but supply consistency becomes difficult to maintain
Solution Approach 1:
The pressurizing member serves as a mediator that ensures consistent pressure distribution across all developer storage sections. This intermediary mechanism maintains uniform supply conditions to multiple image forming units even when different developer types are stored in separate compartments.
Solution Approach 2:
The partition plate structure with opening portions serves multiple functions: it divides the storage space for different developer types while simultaneously enabling controlled supply to multiple developing devices. The universal design allows the same structural element to achieve both separation and connection functions.
3Ease of manufacture
If multiple screws are used to secure the cover, then assembly is simplified, but developer leakage risk increases due to pressure buildup
Solution Approach 1:
The pressurizing member acts as an intermediary pressure management system that prevents harmful pressure buildup while maintaining secure assembly. This spring-loaded mechanism mediates between the mechanical fastening provided by multiple screws and the need to prevent developer leakage, allowing both assembly simplicity and leakage prevention.
Solution Approach 2:
The pressurizing member provides beforehand cushioning against pressure fluctuations that could cause leakage. By pre-establishing a pressure equilibrium mechanism, the system cushions against potential harmful effects of pressure buildup before leakage can occur, while maintaining the simplified multi-screw assembly structure.
Data Source
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AI summary
An image forming apparatus includes an image carrier; a developing device that applies a developer to the image carrier; and a supplying device that supplies a developer to the developing device, the supplying device having a developer flow path along which a developer that moves toward the developing device passes, the supplying device being configured such that a gas that has flowed from the developing device to the supplying device passes along the developer flow path toward an upstream side in a movement direction of a developer.