Duct Moving Unit for Image Forming Device Airflow Management
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Solution Overview
Problem
In electrophotographic image-forming devices, the ventilation system design leads to either damage from rubbing parts or significant air leakage when the process cartridge is mounted or removed, affecting the efficiency of air circulation around the charger.
Innovation Solution
An image-forming device with a duct moving unit that adjusts the position of the duct outlet relative to the casing inlet, allowing for both secure mounting and minimal air leakage by switching between adjacent and separated positions during the mounting and removal processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the duct outlet is in close contact with the casing inlet, then air circulation efficiency is improved, but the duct outlet and casing inlet may rub against each other causing damage during mounting and removal
Solution Approach 1:
The duct outlet is made movable relative to the casing inlet through a duct moving unit, allowing the system to dynamically adjust the position between the duct outlet and casing inlet. During operation, the duct outlet is positioned adjacent to the casing inlet for efficient air circulation, while during mounting and removal, the duct outlet is moved to a separated position to prevent rubbing damage.
2Object-affected harmful factors
If a gap is formed between the casing inlet and duct outlet to prevent rubbing damage, then reliability is improved, but air blown by the fan leaks through the gap reducing ventilation efficiency
Solution Approach 1:
The system dynamically adjusts the gap between the duct outlet and casing inlet based on operational state. During ventilation operation, the duct outlet is positioned adjacent to the casing inlet to minimize air leakage and maintain high ventilation efficiency. During cartridge mounting and removal, the duct outlet is moved away to create a gap that prevents rubbing damage while the system accepts temporary ventilation interruption.
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
Prevents damage to the duct outlet and casing inlet while maintaining effective air circulation around the charger, ensuring efficient operation and reducing maintenance issues.
Implementation Method 1
a fan (100) that blows air on the charger (72) through the duct outlet (111) of the first duct member (112) and the casing inlet (75a)
Data Source
AI summary
An image-forming device includes a main casing, a process casing, a photosensitive member, a charger, a first duct member, a fan, and a duct moving unit. The process casing is accommodated in the main casing and removably mounted thereon. The process casing has a casing inlet formed therein. The photosensitive member is disposed in the process casing. The charger is disposed in the process casing for charging a photosensitive member. The first duct member has a duct outlet. The fan blows air on the charger through the duct outlet of the first duct member and the casing inlet. The duct moving unit moves the first duct member between a first position in which the duct outlet of the first duct member is adjacent to the casing inlet formed in the process casing, and a second position in which the duct outlet is separated farther from the casing inlet than in the first position.