Dual Cooling Roller System for Uniform Temperature Distribution
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Solution Overview
Problem
Existing medium cooling systems in image forming apparatuses face challenges in maintaining uniform cooling performance across the width of the medium, leading to issues like uneven temperature distribution, image quality defects, and sticking of paper due to the asymmetrical heat dissipation and contact areas between cooling rollers and the medium.
Innovation Solution
A medium cooling apparatus comprising a first cooling unit and a second cooling unit, where the first unit has a higher cooling capacity and absorbs more heat, and the second unit has a lower capacity, with a dual-fan system that alternates airflow direction to ensure balanced cooling and adjustable winding angles to optimize contact areas, thereby enhancing cooling efficiency and preventing image quality defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cooling roller is used to cool the medium, then the structure is simple, but the temperature distribution across the medium becomes uneven
Solution Approach 1:
The single cooling roller is divided into two separate cooling rollers (first cooling roller and second cooling roller). Each roller independently cools a different region of the medium, allowing for better temperature control across the entire medium width. This segmentation resolves the contradiction by increasing temperature uniformity while maintaining reasonable structural complexity through modular design.
Solution Approach 2:
Each cooling roller is designed with specific characteristics optimized for its position: the first cooling roller has a larger diameter and higher cooling capacity for the upstream region, while the second cooling roller has a smaller diameter and lower cooling capacity for the downstream region. This local optimization ensures uniform temperature distribution across different zones of the medium.
2Power
If the first cooling roller has larger diameter for better cooling, then cooling capacity increases, but the contact area with medium becomes insufficient
Solution Approach 1:
The cooling function is segmented between two rollers with different diameters. The first cooling roller has a larger diameter to provide high cooling capacity, while the second cooling roller has a smaller diameter to ensure adequate contact area. This segmentation allows each roller to optimize for its specific function without compromise.
Solution Approach 2:
Different contact areas are assigned to different cooling rollers based on their positions and cooling requirements. The first cooling roller with larger diameter provides intense cooling where needed, while the second cooling roller with appropriate contact area ensures sufficient heat transfer. This local quality optimization resolves the contradiction between cooling capacity and contact area.
3Device complexity
If cooling is applied uniformly across the medium, then the cooling process is simple, but temperature unevenness occurs due to asymmetrical heat dissipation
Solution Approach 1:
Different cooling intensities are applied to different regions of the medium through the two cooling rollers. The first cooling roller provides stronger cooling with larger diameter and higher heat dissipation capacity, while the second cooling roller provides milder cooling with smaller diameter. This local quality differentiation achieves uniform temperature distribution across the medium while maintaining relatively simple cooling control mechanisms.
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 dual-cooling unit system effectively reduces temperature unevenness across the medium, improves cooling efficiency, and prevents image defects like image missing and sticking, by ensuring consistent heat dissipation and contact area management.
Implementation Method 1
a first cooling unit that cools a medium by absorbing heat from the medium when the medium is in contact with an outer surface of the first cooling unit
Implementation Method 2
a second cooling unit that is arranged on the downstream side from the first cooling unit in a medium conveyance direction, and cools the medium by absorbing heat from the medium when the medium is in contact with an outer surface of the second cooling unit
Data Source
AI summary
There is provided a medium cooling apparatus. A first cooling unit cools a medium by absorbing heat from the medium when the medium is in contact with an outer surface of the first cooling unit. A second cooling unit is arranged on the downstream side from the first cooling unit in a medium conveyance direction, and cools the medium by absorbing heat from the medium when the medium is in contact with an outer surface of the second cooling unit, and is set such that an amount of heat absorption is smaller than an amount of heat absorption of the first cooling unit.