Decolorable Ink Protection in Image Fixing Apparatus
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Solution Overview
Problem
The challenge is to prevent the unintended erasure of critical documents or images on sheets using decolorable ink, which become colorless at 65 degrees Celsius, when they are processed in image forming apparatuses that use a fixing temperature of around 180 degrees Celsius, leading to the decolorization of unwanted content.
Innovation Solution
An image forming apparatus is designed with a reading section to identify whether an image on a sheet can be decolorized and a control section to manage the erasure process, using a fixing device that can switch between fixing and decoloring temperatures, and includes a check box indicator to prevent erasure of undesired content by releasing pressure and heat if the identifier is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixing device heats the sheet at fixing temperature (180°C) to fix toner images, then the toner image is properly fixed, but the decolorable ink (colorless at 65°C) is unintentionally erased
Solution Approach 1:
The reading section performs preliminary detection of the sheet to identify whether it contains decolorable ink before the fixing process. Based on this detection result, the control section预先 determines the appropriate temperature control strategy, preventing unintended erasure before it occurs
Solution Approach 2:
The fixing device dynamically adjusts its operating temperature based on the detection result. When decolorable ink is detected, the temperature is controlled to remain below the decoloring threshold (65°C) while still achieving adequate fixing. When no decolorable ink is present, the normal fixing temperature (180°C) is applied
2Reliability
If the reading section is added to detect decolorable ink, then unintended erasure is prevented, but the device complexity increases
Solution Approach 1:
The reading section serves multiple functions: it detects decolorable ink to prevent unintended erasure, and also reads images for normal copying operations. This multi-functionality reduces the need for separate dedicated detection devices
Solution Approach 2:
The control section integrates the processing of detection results with the existing fixing control logic. The temperature control system is modified to accommodate both normal fixing and protective temperature control modes, merging these functions into a unified control framework
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 effectively prevents the erasure of unwanted images by accurately determining the decolorability of the ink and controlling the processing temperature, ensuring that only intended content is erased, thus preserving critical documents and figures.
Implementation Method 1
a reading section (23) arranged at an upstream side of the fixing device (29) in a conveyance direction of a sheet (P) to read an identifier indicating whether or not color material of an image formed on the sheet (P) can be decolorized
Implementation Method 2
a fixing device (29) configured to include a pressure section and a heating section to heat the image receiving medium and to execute a fixing processing for fixing an image formed with decolorable color material on the image receiving medium at a fixing temperature or an erasure processing for erasing an image at a decoloring temperature
Implementation Method 3
a decolorable color material with which to form an image on a sheet and which is decolorized when a temperature rises
Data Source
AI summary
An image forming apparatus includes a fixing device configured to include a pressure section and a heating section for heating an image receiving medium and to execute a fixing processing for fixing an image formed on the image receiving medium with a decolorable color material at a fixing temperature or an erasure processing for erasing an image at a decoloring temperature, a reading section configured to be arranged at the upstream side of the fixing device in the conveyance direction of the image receiving medium to read an identifier indicating whether or not the color material of the image formed on the image receiving medium can be decolorized, and a control section configured to control the execution of the erasure processing of the image on the image receiving medium with the fixing device according to a result of reading of the identifier with the reading section.