Sheet Deviation Compensation in Decolorizing Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing decolorizing apparatuses face issues with accurately printing marks on sheets due to sheet deviation during transport, leading to false detection and contamination, which affects the reusability of sheets.
Innovation Solution
The decolorizing apparatus includes a reading unit, a printing unit with adjustable nozzles, and a control unit that detects sheet deviation and adjusts nozzle positions to ensure precise mark placement, using non-decolorable ink to print marks indicating the number of uses, and determines sheet reusability based on the number of marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sheet transport is performed in the decolorizing apparatus, then the sheet can be processed through reading and mark printing, but sheet deviation occurs during transport causing marks to be printed outside defined positions or on transport paths
Solution Approach 1:
The system performs preliminary detection of sheet position deviation using a reading unit before the mark printing operation. By detecting the actual sheet position in advance and calculating the deviation from the transport path, the system can pre-determine which nozzle to activate, thereby preventing position errors before they occur during the marking process.
Solution Approach 2:
The system implements a feedback mechanism where the reading unit continuously monitors sheet position during transport, and this position information is fed back to the control unit. The control unit then adjusts which printing nozzle is activated based on the detected deviation, creating a closed-loop control system that automatically compensates for transport variations.
2Reliability
If marks are printed on sheets to indicate erasing次数, then sheet reusability can be tracked, but false detection of marks or contamination of subsequently transported sheets occurs due to position deviation
Solution Approach 1:
The reading unit detects the actual position of printed marks on the sheet, and this detection feedback is used to verify whether the mark was printed in the correct position. If deviation is detected, the system can identify false detections or contamination issues and adjust subsequent printing operations accordingly, ensuring reliable mark tracking.
Solution Approach 2:
The system replaces mechanical positioning methods with an optical detection and control system. Instead of relying solely on precise mechanical alignment of nozzles with the sheet, the invention uses optical reading units to detect sheet position and mark position, and uses control logic to select appropriate nozzles, thereby eliminating mechanical positioning errors.
3Device complexity
If the printing unit uses fixed nozzles, then the structure is simple, but accurate mark placement cannot be achieved when sheet deviation occurs
Solution Approach 1:
The printing unit transitions from a static, fixed-nozzle configuration to a dynamic system where the control unit can selectively activate different nozzles based on real-time sheet position feedback. This dynamic adaptation allows the system to maintain printing accuracy despite sheet deviation, as the appropriate nozzle is activated based on the detected sheet position rather than relying on fixed mechanical alignment.
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 ensures accurate mark placement, preventing erroneous printing and contamination, improving detection accuracy and enabling proper sheet reuse or disposal based on usage history.
Implementation Method 1
a reading unit that reads an image formed on a sheet
Implementation Method 2
a printing unit that includes a plurality of nozzles for outputting colorants and for printing any one of a mark
Implementation Method 3
there is a decolorizing apparatus which erases an image by heating a sheet having the image formed with a decolorable colorant at a decolorable temperature
Implementation Method 4
heating a sheet having the image formed with a decolorable colorant at a decolorable temperature
Data Source
AI summary
An erasing apparatus of an embodiment includes a reading unit, a printing unit, a transport unit, and a control unit. The reading unit reads an image formed on a sheet. The printing unit includes a plurality of nozzles that output colorants, and prints any one of a mark that is defined in advance or a code image of a machine-readable format on the sheet. The transport unit transports the sheet in order of the reading unit and the printing unit. The control unit detects an amount of deviation of the sheet generated on a transport path based on the image on the sheet which is read by the reading unit, selects which nozzle in the printing unit to output the colorant based on the amount of deviation, and controls the printing unit so as to perform printing from the selected nozzle.