Fixing Temperature Control for Overlapping Toner Layers
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Solution Overview
Problem
Existing image forming apparatuses struggle to set an appropriate fixing temperature for overlapping toner layers on a recording material, as the usage histories of multiple developing devices vary, leading to inconsistent fixing performance and potential defects.
Innovation Solution
An image forming apparatus with a storage medium to record usage histories of developing devices and a control mechanism to adjust the fixing temperature based on these histories, ensuring optimal temperature settings for each toner layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single fixing temperature is used for all developing devices, then the fixing process is simple to control, but fixing defects occur when usage histories of multiple developing devices vary
Solution Approach 1:
The patent applies parameter changes by adjusting the fixing temperature based on the usage history of each developing device. The control unit determines different fixing temperatures corresponding to different usage histories, thereby adapting the fixing parameters to match the actual state of each developing device and preventing fixing defects.
2Reliability
If the fixing temperature is adjusted based on usage history of each developing device, then fixing quality improves, but the control system becomes more complex
Solution Approach 1:
The patent implements feedback by having the control unit acquire usage history information from each developing device and use this feedback to determine appropriate fixing temperatures. This closed-loop control ensures that the fixing temperature adapts to the actual state of the developing devices, improving fixing quality while maintaining manageable system complexity through automated feedback processing.
3Device complexity
If conventional fixing temperature setting is used, then the device complexity remains low, but fixing defects occur due to varying usage histories
Solution Approach 1:
The patent applies preliminary action by having the control unit acquire usage history information from each developing device before the fixing process and determine the appropriate fixing temperature in advance. This preliminary determination of fixing parameters based on usage history prevents fixing defects from occurring in the first place, rather than attempting to correct them afterward.
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 approach reduces fixing defects by accurately determining the fixing temperature based on the usage history of each developing device, improving the fixing process for overlapping toner images.
Implementation Method 1
fixing means configured to press and heat the recording material on which the toner images are transferred and to fix the toner images on the recording material
Data Source
AI summary
An image forming apparatus includes a plurality of developing member to form toner images, respectively, a transfer member to sequentially transfer the toner images onto a recording material and to overlappingly form toner on the recording material. A fixing member presses and heats the recording material on which the toner images are transferred and fixes the toner images on the recording material. A storage medium stores a usage history of the developing member. A controller controls a fixing temperature of the fixing member. The controller determines the fixing temperature based on a difference between the usage history of one of the developing member stored in the storage medium and the usage history of another of the developing member.