Heating Roller Cooling via Fan and Guide Airflow
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Solution Overview
Problem
The existing image forming apparatuses take an undesirably long time to cool the heating roller after switching from decolorizing mode to fixing mode, leading to potential downtime and user inconvenience.
Innovation Solution
The apparatus includes a fan and a guide unit that control the airflow to the heating roller, allowing it to be driven at a lower temperature, thereby accelerating the cooling process by directing wind generated by the fan to the roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the heating roller performs idle running for natural cooling, then the structure remains simple, but the cooling time becomes excessively long causing user downtime
Solution Approach 1:
The patent introduces a fan to generate airflow and guide it to the heating roller surface, using pneumatic principles to accelerate heat dissipation. The fan creates forced convection current that rapidly removes heat from the roller, reducing cooling time from minutes to seconds without adding complex mechanical cooling systems
2Productivity
If a fan is introduced to cool the heating roller, then the cooling time is reduced, but the device complexity increases
Solution Approach 1:
The fan is integrated into the existing fixing device structure, utilizing the device's own power supply and control systems. The cooling function is activated automatically through the existing control unit based on operational mode transitions, allowing the system to cool itself without external intervention or additional complex control mechanisms
Solution Approach 2:
The fan serves multiple functions: it provides forced cooling during mode transitions, assists in heat dissipation during high-temperature operations, and can be integrated with the existing ventilation system of the fixing device. This multi-functionality justifies the addition by providing benefits beyond单纯的冷却
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 shortens the cooling time of the fixing device, preventing user downtime and ensuring efficient operation by evenly cooling the entire fixing device.
Implementation Method 1
The fan generates wind. The guide guides the wind generated from the fan to the heating roller
Data Source
AI summary
An image forming apparatus according to an embodiment includes an image forming unit, a heating unit, a fan, a guide, and a control unit. The image forming unit forms an image on a recording medium. The heating unit is disposed on a downstream side of the image forming unit in a transport direction of the recording medium. The heating unit is driven with at least two temperatures, a first temperature and a second temperature lower than the first temperature. The fan generates wind. The guide guides the wind generated from the fan to the heating unit. The control unit controls the fan and the guide when the control unit controls the heating unit by switching between driving the heating unit at the first temperature and at the second temperature.