Heating Unit Ventilation Layout for Movable Fixing Unit Cooling
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Solution Overview
Problem
Efficient cooling of the heating unit in an image forming apparatus without obstructing the movement mechanism is challenging, as existing systems often hinder the withdrawal of the fixing unit.
Innovation Solution
A ventilation duct system with fans and a unit movement mechanism that allows the heating unit to move between positions, enabling efficient cooling while allowing the fixing unit to be drawn out, using a pair of fans to blow air through a hollow portion and discharge opening, and a link mechanism to transmit operation member movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ventilation duct system with fans is added to cool the heating unit, then cooling efficiency is improved, but device complexity increases and may obstruct the movement mechanism
Solution Approach 1:
The ventilation duct is merged with the unit movement mechanism structure, where the duct serves as both a cooling pathway and part of the mechanical framework. The fans are integrated into the existing housing structure rather than being separate components, reducing overall device complexity while maintaining cooling functionality.
Solution Approach 2:
The heating unit housing serves multiple functions: it contains the heater, provides structural support for the ventilation duct, and acts as part of the movement mechanism framework. This multi-functionality reduces the need for separate cooling components, thereby reducing device complexity while improving cooling efficiency.
2Ease of repair
If the heating unit is positioned to allow fixing unit withdrawal, then ease of maintenance is improved, but cooling efficiency may deteriorate due to restricted airflow
Solution Approach 1:
The heating unit is designed to move dynamically between a reference position during operation and an evacuation position for maintenance. The ventilation duct system is configured to maintain effective airflow paths in both positions, ensuring cooling efficiency is preserved during operation while allowing easy access during maintenance.
Solution Approach 2:
The ventilation system is segmented into multiple airflow paths with separate inflow and discharge openings positioned to maintain effective cooling airflow regardless of the heating unit's position. This segmentation ensures that cooling efficiency is maintained even when the unit is in the evacuation position for maintenance access.
3Ease of operation
If the unit movement mechanism is positioned to couple with the heating unit, then ease of operation is improved, but it may obstruct the airflow path for cooling
Solution Approach 1:
The ventilation duct is positioned in a spatial dimension that is independent of the unit movement mechanism's operation path. The airflow path is routed through areas not occupied by the movement mechanism components, allowing both the movement mechanism to function easily and the cooling airflow to move unobstructed.
Solution Approach 2:
The ventilation duct acts as an intermediary structure that bridges the heating unit and the external environment for airflow, while the unit movement mechanism operates in a separate spatial plane. This intermediary positioning allows the movement mechanism to couple with the heating unit for ease of operation without interfering with the cooling airflow path.
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 heating unit is efficiently cooled without obstructing the movement of the fixing unit, maintaining operational efficiency and ease of maintenance.
Implementation Method 1
The heating unit includes a heater which heats the fixing member
Implementation Method 2
a pair of fans which blow air toward the heating unit
Implementation Method 3
a pressure member which biases a sheet toward the fixing member
Data Source
AI summary
A unit movement mechanism causes a heating unit to move in conjunction with a movement of an operation member. A pair of fans are arranged with an interval provided therebetween in a first direction and blow air toward the heating unit. The heating unit includes a ventilation duct including a hollow portion formed along the first direction, a pair of inflow openings which are formed opposite to the pair of fans, and a discharge opening which is formed between the pair of inflow openings in the first direction. The unit movement mechanism includes a unit coupling member and a link mechanism. The unit coupling member is coupled to the heating unit while a gap is provided between the unit coupling member and the discharge opening.