Printing System Image Defect Diagnosis During Normal Production
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Solution Overview
Problem
Conventional image diagnosis techniques for image forming apparatuses require printing a test chart to identify malfunctions, leading to prolonged downtime and decreased productivity due to the need to adjust paper feeding units and change print conditions.
Innovation Solution
A printing system that utilizes read image data of printed products with detected defects to identify malfunctions, reducing downtime by performing image diagnosis without suspending printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test chart is printed to identify malfunctions, then image diagnosis accuracy is improved, but downtime increases and productivity decreases
Solution Approach 1:
The patent uses read image data from actual printed products as a copy of the test chart function, eliminating the need to print separate test charts. The image reading device captures images of printed products during normal operation, and these images are used for malfunction identification, thereby maintaining diagnostic accuracy while avoiding production interruption.
Solution Approach 2:
The system performs image diagnosis continuously during normal printing operations by utilizing read image data from the image reading device. The printing process and diagnosis process run simultaneously without interruption, maintaining continuous productive action while performing necessary quality control and malfunction detection.
2Measurement precision
If printing is suspended for image diagnosis processing, then malfunction identification accuracy is improved, but downtime increases
Solution Approach 1:
The system performs malfunction identification using read image data during continuous printing operations. The image reading device captures images of printed products as they pass through, and the control device processes these images to identify malfunctions without suspending the printing process, thereby eliminating downtime while maintaining diagnostic accuracy.
Solution Approach 2:
The system uses the read image data that is already being captured by the image reading device for its primary function of monitoring printed products. This existing data stream is repurposed for malfunction identification, eliminating the need for separate diagnostic printing and allowing continuous operation without interruption.
3Measurement precision
If paper feeding unit designation and print condition changes are required, then image diagnosis accuracy is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The system uses read image data from actual printed products as a substitute for test charts, eliminating the need to manually designate paper feeding units or change print conditions. The image reading device automatically captures images during normal operation, and the control device processes these images for malfunction identification without requiring user intervention for setup.
Solution Approach 2:
The system automatically performs malfunction identification using read image data without requiring user intervention for paper feeding unit designation or print condition adjustment. The control device processes the captured images and identifies malfunctions autonomously, greatly simplifying operation while maintaining diagnostic accuracy.
Data Source
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AI summary
A printing system comprising an image forming apparatus and a diagnostic apparatus. The image forming apparatus creates a printed product corresponding to an input image, and the diagnostic apparatus detects an image defect included in the printed product based on a read image obtained by reading the printed product, and the diagnostic apparatus obtains features of the detected image defect in a case where the image defect is detected, and identifies a factor of the image defect based on the obtained features. In the obtaining the features, if a predetermined condition for the detected image defect is satisfied, the image forming apparatus stops creation of a printed product and causes the diagnostic apparatus obtains the features of the image defect based on the read image obtained by reading the printed product.