Decoloring Device Sheet Classification Sensor
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Solution Overview
Problem
The existing decoloring process is hindered by the offset phenomenon that occurs when sheets printed with non-decolorable toner are mistakenly fed into a decoloring unit, causing the toner to melt and adhere to heating and pressuring members, leading to inefficiencies and potential damage.
Innovation Solution
A decoloring device equipped with a feeding unit, sensor units, and a control system that detects identification marks on sheets to determine if they are printed with decolorable toner, allowing for selective routing of sheets suitable for decoloring and preventing non-decolorable toner sheets from entering the decoloring process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the decoloring unit processes all fed sheets, then the decoloring capacity is maximized, but non-decolorable toner sheets cause offset phenomenon and equipment damage
Solution Approach 1:
The sensor unit performs preliminary detection of identification marks on sheets before they enter the decoloring unit. This advance identification allows the control unit to selectively route only decolorable sheets to the decoloring process, preventing non-decolorable sheets from causing offset phenomena while maintaining high decoloring capacity for eligible sheets
2Productivity
If the decoloring unit processes all fed sheets, then operational efficiency is maintained, but heating and pressuring members suffer potential damage
Solution Approach 1:
The system performs preliminary detection of identification marks on sheets before they reach the heating and pressuring members. This pre-screening mechanism ensures that only decolorable sheets with appropriate toner are subjected to the decoloring process, preventing equipment damage while maintaining continuous operational efficiency for valid sheets
3Measurement precision
If sensor units detect identification marks on all sheets, then sheet classification accuracy is improved, but device complexity increases
Solution Approach 1:
The sensor unit is strategically positioned to detect identification marks only in specific locations on sheets (such as corners or edges where marks are conventionally placed). This localized detection approach achieves accurate sheet classification without requiring complex full-sheet scanning systems, thereby maintaining measurement precision while controlling device complexity
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
The system effectively prevents the offset phenomenon by accurately identifying sheets with decolorable toner, ensuring safe and efficient decoloring processes while avoiding damage to equipment, thereby improving operational efficiency and reducing maintenance needs.
Implementation Method 1
a sensor unit downstream of the feeding unit in a sheet transport direction detects a front position of the sheet fed from the feeding unit, and detects a presence or absence of an identification mark
Implementation Method 2
The decoloring toner is melted at a fixing temperature, and is fixed onto a sheet so that a color is developed. In addition, when a decoloring temperature higher than the fixing temperature is applied, an image of the decoloring toner which is already fixed is decolored
Data Source
AI summary
An embodiment includes a method of determining whether or not to perform a decoloring process on a sheet. A front position of a sheet fed in a sheet transport direction is detected. A presence or absence of an identification mark on a front portion of the sheet outside of an image forming area of the sheet is detected, after detecting the front position of the sheet. A determination is made of whether an image formed with decolorable color material is printed on the sheet based on whether an identification mark is detected on the front portion of the sheet. When the image formed with decolorable color material is determined to be printed on the sheet, the image is decolored.