Fixing Device Non-Contact Heating Control
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Solution Overview
Problem
Existing fixing devices struggle to achieve optimal fixing characteristics across various recording media with different thicknesses, colors, and types, as they fail to adequately adjust heat and pressure settings based on these variables.
Innovation Solution
A fixing device comprising a non-contact heating unit that adjusts heat application based on the color and thickness of the recording medium, and a contact heating unit that controls pressure according to the medium's thickness, ensuring sufficient fixing characteristics regardless of the medium's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single heating method is used for all recording media, then the device structure is simple, but fixing characteristics are insufficient for media with different thicknesses and colors
Solution Approach 1:
The heating system is divided into two independent units: a non-contact heating unit (infrared heater) and a contact heating unit (heating roller). Each unit can be independently controlled and optimized for different recording media types, allowing the system to adapt to various media properties without requiring complete system redesign
Solution Approach 2:
The control unit dynamically adjusts heating parameters (temperature, exposure time, heating intensity) based on detected recording media properties such as thickness and color. This allows the same heating system to optimize its performance for different media types by changing operational parameters rather than physical structure
2Adaptability or versatility
If heat is applied uniformly to all recording media, then the control system is simple, but excessive heat absorption occurs for dark-colored media causing fixing defects
Solution Approach 1:
A detection unit measures properties of the recording media (such as color, thickness, or material characteristics) and provides feedback to the control unit. The control unit then adjusts the heating parameters based on this feedback, creating a closed-loop control system that prevents excessive heat absorption by dark-colored media while ensuring adequate heating for light-colored media
Solution Approach 2:
The system changes heating parameters dynamically based on media properties. For dark-colored media that absorb more heat, the system reduces heating intensity or exposure time. For light-colored media with lower heat absorption, the system increases heating parameters. This adaptive parameter adjustment ensures optimal fixing for all media types
3Adaptability or versatility
If pressure is applied uniformly to all recording media, then the mechanism is simple, but fixing quality varies for media with different thicknesses
Solution Approach 1:
The control unit adjusts pressure parameters based on detected recording media thickness. For thicker media, higher pressure is applied to ensure adequate contact between the heating roller and the recording medium surface. For thinner media, lower pressure prevents deformation or damage. This dynamic pressure adjustment ensures consistent fixing quality across different media thicknesses
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 allows for effective fixing of toner images on diverse media by optimizing heat and pressure settings, enhancing fixing quality and preventing issues like paper wrinkles and excessive heat absorption.
Implementation Method 1
a non-contact heating unit configured to heat a recording medium in a non-contact manner
Implementation Method 2
a contact heating unit configured to press and heat the recording medium on a downstream side of the non-contact heating unit
Data Source
AI summary
A fixing device includes: a non-contact heating unit configured to heat a recording medium in a non-contact manner; and a contact heating unit configured to press and heat the recording medium on a downstream side of the non-contact heating unit in a conveyance direction of the recording medium, in which the non-contact heating unit controls an amount of heat applied to the recording medium according to information on whether the recording medium is black or not, and a thickness of the recording medium, and the contact heating unit controls the pressure applied to the recording medium according to the thickness regardless of whether the recording medium is black or not.