Airflow Channels for Sheet Cooling in Image Forming Apparatus
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Solution Overview
Problem
Current image forming apparatuses face challenges in efficiently cooling sheets post-fixing and managing heat diffusion, which can lead to unstable image formation and increased temperatures of toner cartridges, affecting print quality and longevity.
Innovation Solution
The apparatus incorporates a sheet transport unit with a first channel for airflow from downstream to upstream, an air blowing device to cool sheets, and an air exhaust device to manage heat, using channels to direct airflow and exhaust heated air, thereby cooling sheets and suppressing heat transmission to toner cartridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sheets are transported horizontally above the image forming section, then sheet transport efficiency is improved, but heat accumulates and diffuses to toner cartridges affecting print quality
Solution Approach 1:
The transport path is segmented into multiple sections with different airflow characteristics. The first transport path allows horizontal movement above the image forming section for efficiency, while the second transport path provides a separate route where sheets receive cooling airflow from the air blowing device, preventing heat accumulation and protecting toner cartridges
2Manufacturing precision
If the fixing device heats sheets to fix toner images, then image formation is achieved, but sheet temperature increases causing heat diffusion to surrounding components
Solution Approach 1:
Cooling airflow is applied to sheets in advance during transport through the second transport path, before sheets reach the toner cartridge area. This preliminary cooling action prevents heat diffusion to surrounding components and maintains stable operating temperatures
Solution Approach 2:
The air blowing device acts as an intermediary between the hot sheets from the fixing device and the toner cartridges. It introduces cooling airflow that mediates heat transfer, preventing direct thermal contact between hot sheets and sensitive components
3Temperature
If air is blown to cool sheets, then sheet temperature is reduced, but heat management becomes complex requiring additional devices
Solution Approach 1:
The air blowing device serves multiple functions: it cools sheets during transport, prevents heat diffusion to toner cartridges, and manages overall thermal environment in the transport section. The single device performs what would otherwise require multiple separate cooling and ventilation systems
Solution Approach 2:
The cooling function and heat management functions are merged into a single airflow system. The air blowing device creates a unified cooling flow that simultaneously addresses sheet cooling and heat prevention for multiple components, simplifying the overall system architecture
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 effectively cools sheets and reduces toner cartridge temperatures, ensuring stable and continuous image formation by minimizing heat diffusion and maintaining optimal operating conditions.
Implementation Method 1
an air blowing device that applies airflow to the sheet by using the first channel
Implementation Method 2
an air exhaust device that exhausts air by using the second channel
Data Source
AI summary
An image forming apparatus includes an image forming section, an output section, a sheet transport unit, an air blowing device, and an air exhaust device. The image forming section forms a toner image. The sheet transport unit transports in a region above the image forming section a sheet onto which the toner image has been fixed. A first channel causes air to pass from a downstream side to an upstream side in a sheet transport direction, the air blowing device applies an airflow by using the first channel, a second channel causes the air to pass from the downstream side to the upstream side in the sheet transport direction, and the air exhaust device exhausts the air by using the second channel.