Fixing Unit Cam Slope Mechanism for Adjustable Roller Pressure
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Solution Overview
Problem
Existing image forming apparatuses face challenges in efficiently adjusting the pressing force between the heating roller and the pressure roller, which affects the quality of image fixation and ease of maintenance due to the lack of a reliable mechanism for varying this force.
Innovation Solution
The apparatus incorporates a fixing unit with a cam and slope member system that adjusts the pressing force by using springs and pressure arms, allowing the pressing force to be increased or decreased based on the cam's position, enabling precise control and easy attachment/detachment of the fixing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed pressing force mechanism is used between the heating roller and pressure roller, then the structure is simple, but the image fixation quality cannot be optimized and maintenance is difficult
Solution Approach 1:
The patent implements a dynamic pressing force adjustment mechanism where the pressing force between the heating roller and pressure roller can be varied. This is achieved through an adjustment mechanism that allows changing the position of the pressure roller or the pressing member, thereby optimizing image fixation quality for different operating conditions while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent changes the pressing force parameter dynamically by providing an adjustment mechanism that modifies the physical state or position of components. By adjusting the pressing force parameter, the system can optimize image fixation quality for different paper types, toner formulations, or operating conditions without requiring complete structural redesign.
2Ease of operation
If the pressing force is fixed, then the device structure is simple, but the ease of maintenance is reduced due to inability to adjust for different conditions
Solution Approach 1:
The adjustment mechanism enables dynamic modification of the pressing force, allowing maintenance personnel to optimize the system for different operating conditions or compensate for wear over time. This dynamic capability improves ease of maintenance by providing flexibility without significantly increasing structural complexity.
Solution Approach 2:
The adjustment mechanism is designed to be user-friendly and maintainable, allowing operators or maintenance personnel to adjust the pressing force themselves without requiring specialized tools or extensive technical knowledge. This self-service capability enhances ease of maintenance while keeping the adjustment mechanism relatively simple.
3Adaptability or versatility
If no pressing force adjustment mechanism is provided, then the device complexity is low, but the adaptability to different image fixation requirements is poor
Solution Approach 1:
The patent provides adaptability to different image fixation requirements by enabling changes in the pressing force parameter. The adjustment mechanism allows the system to adapt to various paper types, toner formulations, and fixation temperature conditions, significantly improving versatility while adding only moderate complexity to the overall device structure.
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 provides a mechanism for dynamically adjusting the pressing force between the heating roller and pressure roller, enhancing image fixation quality and facilitating easy maintenance by allowing for adjustable force settings and secure attachment/detachment of the fixing unit.
Implementation Method 1
a spring and a pressure arm. When the cam pushes up the spring, the spring presses the pressure arm
Data Source
AI summary
An image forming apparatus includes a main body and a fixing unit. The fixing unit is attachable to and detachable from the main body. The fixing unit includes a heating roller, a pressure roller, and a pressing member. The pressing member presses the pressure roller against the heating roller. The main body includes a cam and a slope member. The cam changes a pressing state of the pressing member. The slope member guides a lower end of the pressing member to a topmost part of the cam in attachment of the fixing unit to the main body.