Image Forming Apparatus Fixing Temperature Control
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately setting optimal printing conditions for various paper types, particularly in distinguishing between different grammages, which can lead to suboptimal image formation and potential issues like high-temperature or low-temperature offset, resulting in inefficiencies and paper quality issues.
Innovation Solution
The apparatus incorporates a media sensor to detect paper thickness further upstream than the fixing unit, a classification processing unit to sub-classify paper types into more precise sub-groups based on detected thickness, and a control unit that adjusts the fixing temperature within predetermined ranges for each sub-group, ensuring optimal image formation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a media sensor detects paper thickness further upstream than the fixing unit to enable precise paper type classification, then the precision of paper type discrimination is improved, but the device complexity increases due to additional sensors and classification processing units
Solution Approach 1:
The patent segments the paper type classification into multiple hierarchical levels: first dividing paper into broad groups (thin, medium, thick) based on grammage ranges, then further subdividing each group into sub-groups based on detected thickness values. This segmentation allows precise discrimination without requiring a single complex classification system, thereby managing device complexity while improving measurement precision.
Solution Approach 2:
The media sensor detects paper thickness further upstream in the conveying direction before the paper reaches the fixing unit. This preliminary detection allows the control unit to pre-classify the paper type and set appropriate fixing conditions in advance, improving classification precision while allowing the classification processing to be integrated into the existing control system rather than requiring separate complex hardware.
2Manufacturing precision
If the fixing temperature is adjusted within specific ranges for each paper sub-group based on detected thickness, then the image formation quality is improved, but the control system complexity increases
Solution Approach 1:
The patent applies different fixing temperature ranges tailored to each paper sub-group based on its specific thickness characteristics. Instead of using a single fixed temperature for all paper types, the control unit selects from multiple predefined temperature ranges (first through fourth ranges) corresponding to different paper sub-groups. This local optimization of fixing conditions improves image formation quality while maintaining relatively simple control logic through predefined temperature ranges.
Solution Approach 2:
The control unit changes the fixing temperature parameter based on the detected paper thickness and classified sub-group. By establishing predetermined temperature ranges for different paper types and selecting the appropriate range based on media sensor data, the system achieves precise temperature control for optimal image formation without requiring complex real-time temperature optimization algorithms.
3Adaptability or versatility
If plural paper type groups are held with different fixing temperature ranges to accommodate various grammages, then the adaptability to different paper types is improved, but the data management complexity increases
Solution Approach 1:
The patent segments paper types into multiple groups based on grammage ranges (thin, medium, thick paper groups), and further divides each group into sub-groups based on detected thickness. This hierarchical segmentation allows the system to manage diverse paper types in an organized manner, improving adaptability while keeping data management systematic through clear group-subgroup relationships rather than requiring unstructured data handling.
Solution Approach 2:
The control unit is designed to universally handle multiple paper type groups and sub-groups through a single integrated classification and control system. Rather than requiring separate control mechanisms for each paper type, the universal control unit can select from multiple predetermined temperature ranges based on the classified paper sub-group, achieving high adaptability through a unified multi-functional system that simplifies data management.
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 precise tuning of fixing temperatures based on paper thickness, enhancing the processing of multiple paper types by preventing offset issues and ensuring consistent image quality across different grammages, thereby increasing the apparatus's capability to handle a wider range of paper types efficiently.
Implementation Method 1
a media sensor that is provided further upstream in a conveying direction of the recording medium than this fixing unit and detects thickness of a recording medium
Data Source
AI summary
Using an operation panel a user selects group to which a recording medium to be subjected to image formation belongs out of plural groups of recording media classified according to grammages, a classification processing unit sub-classifies the group selected, to which the recording medium belongs, into plural sub-groups of recording media according to a detecting result of the media sensor provided further upstream in a conveying direction of a recording medium than a fixing unit, and a control unit sets, for the recording medium belonging to the group selected, the temperature of the fixing unit to a fixing temperature in a fixing temperature range and controls this fixing temperature according to any one of the sub-groups sub-classified. Consequently, it is possible to perform fixing processing at an optimum temperature according to a type of a recording medium.