Printing System Defect Detection and Discharge Control
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Solution Overview
Problem
Existing printing systems incorrectly identify normal printed sheets as defective, leading to unnecessary wastage due to issues like stains in the inspection device or incorrect reference image settings, resulting in sheets being erroneously discharged onto an escape tray.
Innovation Solution
A printing system that includes a printing unit, an inspection unit, and a discharge unit, where the inspection unit inspects printed sheets and the discharge unit directs subsequent sheets to a secondary discharge destination only after confirming the absence of defects, thereby reducing wastage by ensuring accurate defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the purge function discharges subsequent printed sheets without inspection after detecting a printing defect, then the discharge speed is improved, but the accuracy of defect detection deteriorates causing normal sheets to be erroneously discharged to escape tray
Solution Approach 1:
The system performs inspection on subsequent printed sheets in advance before discharge, rather than skipping inspection entirely. This preliminary inspection action ensures that normal sheets are not erroneously discharged to the escape tray while still maintaining efficient processing by using the previously established reference image for comparison.
2Measurement precision
If the inspection unit continuously inspects all printed sheets, then the defect detection accuracy is improved, but the processing time increases
Solution Approach 1:
The inspection is performed periodically at specific intervals rather than continuously on every single sheet. After detecting a printing defect on a sheet, the system inspects the subsequent printed sheets in a periodic manner to verify their normal status, rather than continuously inspecting every sheet without interruption. This periodic inspection approach balances detection accuracy with processing efficiency.
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 minimizes the number of wasted sheets by ensuring that only genuinely defective sheets are discharged onto the escape tray, reducing errors in normal sheet identification and wastage.
Implementation Method 1
an image (read-image) obtained by optically reading a printed sheet
Data Source
AI summary
In a case of inspecting the presence/absence of a printing defect in a printed sheet for which print processing has been performed in a printing unit, the printing system discharges a printed sheet in which no printing defect is detected to a first discharge destination and discharges a printed sheet in which a printing defect is detected to a second discharge destination. In a case where a printing detect is detected in a printed sheet, the printing system also discharges the subsequent printed sheet to the second discharge destination after inspecting the subsequent printed sheet by an inspection unit.