Image Processing Apparatus Sheet Reuse Management
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Solution Overview
Problem
The use of erasable toner in printing is costly when images are not intended for reuse, as the erasable toner is more expensive than ordinary toner and is not necessary for non-reusable prints, leading to unnecessary expenditure.
Innovation Solution
An image processing apparatus that includes a reading unit to determine the number of reuse times of a sheet based on a mark, separating sheets that have been erased a predetermined number of times from those that have not, and using ordinary toner for the last print to reduce costs by identifying and managing reusable and non-reusable sheets effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If erasable toner is used for all printing operations, then sheets can be reused after erasing, but printing cost increases due to the higher cost of erasable toner
Solution Approach 1:
The system applies different toner types to different sheets based on their reuse status. Reusable sheets receive erasable toner for future erasing operations, while non-reusable sheets (those that have reached reuse limit N or are damaged) receive ordinary toner. This local differentiation of toner quality based on sheet condition resolves the contradiction by matching toner cost to actual reuse need.
Solution Approach 2:
The system changes the parameter of toner type (from always erasable to condition-dependent) based on the sheet's reuse history and condition. By monitoring the number of erasing operations and sheet state, the system dynamically adjusts toner selection, using erasable toner only when reuse is intended and ordinary toner when reuse is not possible, thereby reducing overall printing cost while maintaining sheet reuse capability where applicable.
2Productivity
If the number of reuse times is increased, then sheet utilization is improved, but the sheet reaches a practical limit and becomes non-reusable
Solution Approach 1:
The system performs preliminary assessment of sheet condition and reuse history before each printing operation. By tracking the number of erasing operations and evaluating sheet state (deformation, damage, stains) in advance, the system determines whether a sheet can withstand another erasing cycle. This preliminary action prevents exceeding the practical reuse limit N and maintains sheet quality by identifying non-reusable sheets before they are printed on.
Solution Approach 2:
The system implements feedback mechanisms to monitor sheet condition throughout its lifecycle. After each erasing operation, the sheet's state is evaluated and fed back to the control unit, which adjusts future printing decisions accordingly. This continuous feedback loop enables the system to maximize sheet utilization up to the practical limit while automatically detecting when quality degradation occurs, ensuring reliable operation within safe reuse boundaries.
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 printing costs by using ordinary toner for sheets that have reached their reuse limit, optimizing toner usage and minimizing waste by distinguishing between reusable and non-reusable sheets based on their reuse history.
Implementation Method 1
an erasable coloring agent on the sheet is decolorized by the heating
Implementation Method 2
the erasable coloring agent is decolorized when heated to a high temperature
Implementation Method 3
a press roller and a heat source are oppositely arranged with each other across a sheet conveyance path
Data Source
AI summary
An image processing apparatus includes a reading unit configured to read a mark formed on a sheet an erasing unit configured to erase an image formed on the sheet, and a control unit configured to determine the number of times an image on the sheet have been erased based on the mark, and cause a first sheet to be separated from a second sheet if an image on the first sheet has been erased a predetermined number of times and an image on the second sheet has been erased less than the predetermined number of times.