Heating Unit Evacuation Mechanism for Image Forming Apparatus
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Solution Overview
Problem
The existing electrophotographic image forming apparatuses face challenges in accurately positioning and evacuating the heating unit relative to the fixing unit, which affects the heating efficiency and the ability to draw out the fixing unit from the main body, requiring a mechanism that balances proximity and evacuation functions without mechanical interference.
Innovation Solution
The apparatus incorporates a movement mechanism with an action member and unit bias members, allowing the heating unit to move between positions and engage with the fixing unit, enabling precise positioning and evacuation, ensuring accurate alignment and easy removal of the fixing unit from the main body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the heating unit is positioned close to the fixing unit for heating operation, then heating efficiency is improved, but the fixing unit cannot be drawn out from the main body
Solution Approach 1:
The heating unit is designed to be movable between a reference position (close to fixing unit for heating) and an evacuation position (far from fixing unit for removal). The action member enables dynamic repositioning of the heating unit, allowing the system to switch between heating mode and maintenance mode. This resolves the contradiction by making the heating unit's position dynamic rather than fixed.
2Ease of operation
If the heating unit is evacuated from the reference position, then the fixing unit can be drawn out from the main body, but heating efficiency decreases
Solution Approach 1:
The system dynamically repositions the heating unit based on operational requirements. During maintenance, the heating unit is evacuated to allow fixing unit removal. During operation, the heating unit returns to the reference position for efficient heating. This dynamic positioning resolves the contradiction between accessibility and heating efficiency.
3Manufacturing precision
If a mechanism is added to move the heating unit between positions, then positioning accuracy and evacuation capability are improved, but device complexity increases
Solution Approach 1:
The action member is designed to be self-driven through the interaction between the operation portion and the unit bias member. When the operation portion moves, it directly drives the action member to reposition the heating unit without requiring separate motors or complex control systems. The unit bias member provides automatic resetting force, eliminating the need for additional actuators to return the mechanism to its initial state.
Solution Approach 2:
The unit bias member acts as an intermediary elastic element that stores and releases mechanical energy. It mediates between the operation portion's movement and the heating unit's repositioning, providing controlled force while simplifying the overall mechanism. This intermediary component reduces complexity by consolidating multiple functions into a single elastic element.
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
This solution ensures high-accuracy positioning of the heating and fixing units, enhancing heating efficiency and allowing for the easy removal of the fixing unit, thereby improving the operational flexibility and maintenance of the image forming apparatus.
Implementation Method 1
The heater heats the fixing member
Implementation Method 2
The unit bias member is an elastic member disposed on a side opposite to a side of the fixing unit from the heating unit
Data Source
AI summary
An action member is movable between a first position at which a unit bias member is sandwiched between the action member and a heating unit and a second position. A movement mechanism operates in conjunction with a movement of an operation portion to cause the action member to move from one of the first position and the second position to another one of the first position and the second position. A contact portion of the heating unit comes into contact with a fixing unit by a bias force received from the unit bias member when the action member is at the first position. The action member includes an engagement portion which engages with a part of the heating unit when the action member moves from the first position to the second position. The heating unit engages with the engagement portion to move from a reference position to an evacuation position.