Exchangeable Fixing Units with Zoned Heater Control for Small Paper
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Solution Overview
Problem
Image forming apparatuses experience non-paper-passing portion temperature rise when handling smaller recording materials, potentially damaging components due to uneven heating distribution.
Innovation Solution
The apparatus allows for interchangeable fixing units with different temperature detection elements and heaters, enabling independent control of heating blocks based on the mounted unit, ensuring optimal temperature management for various paper sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single heater is used for all paper sizes, then the device structure is simple, but non-paper-passing portions overheat when small paper is processed
Solution Approach 1:
The heater is divided into multiple independent heating blocks (first heating block, second heating block, third heating block) that can be independently controlled. This segmentation allows selective heating of only the regions where paper passes through, preventing overheating of non-paper-passing portions while maintaining simple overall device structure.
2Measurement precision
If multiple temperature detection elements are used, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
Temperature detection elements are strategically placed at specific locations (first temperature detection element for the first heating block, second temperature detection element for the second heating block) to monitor critical regions. This localized approach provides sufficient temperature control precision without requiring excessive detection elements throughout the entire heater.
Solution Approach 2:
The temperature detection elements serve multiple functions: they monitor heater temperature, detect paper presence, and provide feedback for controlling the heating blocks. This multi-functionality reduces the need for additional specialized sensors, maintaining measurement precision while limiting device complexity.
3Stability of the object's composition
If heating blocks are independently controllable, then temperature distribution uniformity is improved, but control system complexity increases
Solution Approach 1:
The control system dynamically adjusts the operation of each heating block based on real-time temperature feedback from the temperature detection elements and the detected paper size. This dynamic control enables uniform temperature distribution across different paper sizes without requiring an overly complex static control system.
Solution Approach 2:
The control system uses feedback from temperature detection elements to monitor and adjust the heating blocks independently. This feedback mechanism ensures uniform temperature distribution while keeping the control system relatively simple through straightforward closed-loop control of each heating block based on its corresponding temperature sensor.
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 prevents overheating by adjusting heating block temperatures according to paper size, maintaining consistent fixing performance and preventing component damage.
Implementation Method 1
a first fixing unit having a first heater and a second fixing unit having a second heater different from the first heater
Implementation Method 2
the first fixing unit has a first number of first temperature detection elements that detect the temperature of the first heater
Data Source
AI summary
An image forming system that includes an apparatus main body, equipped with an image forming portion, and a control portion that controls a fixing operation of fixing the image on a recording material is disclosed. A first fixing unit and a second fixing unit can be selectively mounted on the apparatus main body. The first fixing unit has a heater and a plurality of temperature detection elements that detect the temperature of the first heater. The second fixing unit has a second heater and a second plurality of temperature detection elements that detect the temperature of the second heater. The control portion controls the fixing operation based on first temperature information detected by the first temperature detection elements when the first fixing unit is mounted, and controls the fixing operation based on second temperature information detected by the second temperature detection elements when the second fixing unit is mounted.