Rotary Separation Aid Prevents Hot Offset in Fixing Rotator
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Solution Overview
Problem
Existing image forming apparatuses face challenges in effectively separating recording media from fixing rotators without causing overheating or damage to the toner image, leading to issues like hot offset and decreased gloss.
Innovation Solution
A separator is introduced with a separation body and rotary separation aid that projects beyond the conveyance path side face, rotating to direct the recording medium away from the fixing rotator, preventing excessive heat transfer and ensuring precise separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the separator is positioned close to the fixing rotator to ensure effective separation, then the separation precision is improved, but the recording medium may be overheated by the fixing rotator causing hot offset and decreased gloss
Solution Approach 1:
A non-heating separation roller is introduced as an intermediary component between the heated fixing rotator and the recording medium. This roller performs the separation function without transferring heat to the recording medium, thus resolving the contradiction between achieving close separation and preventing overheating.
Solution Approach 2:
The separation function is segmented from the fixing function. The fixing rotator remains dedicated to heating and fixing, while a separate non-heating separation roller handles the separation task, allowing each component to optimize its specific function without compromising the other.
2Device complexity
If a stationary separation structure is used to separate the recording medium, then the device complexity is reduced, but the separation effectiveness decreases due to inability to adapt to varying conveyance conditions
Solution Approach 1:
The separation roller is designed to rotate rather than remain stationary, allowing it to adapt dynamically to varying recording medium conveyance conditions. This rotational movement enables the separator to maintain effective contact and separation performance across different operating scenarios without increasing overall device complexity.
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 solution effectively prevents overheating and maintains image quality by ensuring the recording medium is separated from the fixing rotator without excessive heat conduction, thereby reducing hot offset and maintaining high gloss and quality of the toner image.
Implementation Method 1
The rotary separation aid is rotated by the recording medium as the recording medium comes into contact with the rotary separation aid
Implementation Method 2
A heater heats the fixing rotator
Implementation Method 3
the fixing rotator and the opposed rotator apply heat and pressure to the recording medium, melting and fixing the toner image on the recording medium
Data Source
AI summary
A separator for separating a recording medium from a fixing rotator includes a separation body including a front end and a conveyance path side face. The front end is disposed in proximity to an outer circumferential surface of the fixing rotator. The conveyance path side face faces a conveyance path where the recording medium is conveyed. At least one rotary separation aid projects beyond the conveyance path side face of the separation body toward the conveyance path. The rotary separation aid is rotated by the recording medium as the recording medium comes into contact with the rotary separation aid.