Continuous Paper Image Forming Apparatus Position Mark Defect Location
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Solution Overview
Problem
In image forming apparatuses using continuous paper, detecting defects requires stopping the output process, which lowers productivity, as operators must search the entire paper roll to find defective sections, making it difficult to effectively utilize defect information.
Innovation Solution
An image forming apparatus that includes an image forming unit and a controller capable of printing position marks on the continuous transfer medium and determining image quality, allowing for notification of defective image positions, enabling continuous output and easy identification of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous printing is performed without stopping after defect detection, then productivity is improved, but operators cannot easily locate defective portions
Solution Approach 1:
Position marks are printed on the continuous transfer medium in advance before defect detection. These marks serve as pre-established reference indicators that allow operators to quickly locate defective portions without searching from the beginning, thus maintaining continuous output while enabling easy defect location.
2Reliability
If the entire continuous paper roll is searched for defects, then all defective portions can be found, but time consumption increases and productivity decreases
Solution Approach 1:
Position marks are printed beforehand on the continuous transfer medium at known intervals or at specific locations. When defects are detected, operators can immediately refer to these pre-printed marks to locate the defective portions, eliminating the need to search from the beginning of the paper roll and significantly reducing inspection time while maintaining complete defect detection.
3Manufacturing precision
If output is stopped to remove defective portions, then image quality is maintained, but productivity is reduced
Solution Approach 1:
Position marks are printed on the continuous transfer medium before the printing process completes. When defects are detected during quality control, operators can use these pre-printed marks to immediately identify and locate defective portions, allowing for targeted removal without stopping the entire output process, thus maintaining both image quality and productivity.
Data Source
AI summary
An image forming apparatus includes: an image forming unit configured to form an image on a continuous transfer medium based on a job; a controller configured to control the image forming unit, the controller having a function to cause the image forming unit to print information indicating a position mark which represents a position at least in a longitudinal direction of the continuous transfer medium on the continuous transfer medium and a function to acquire a result of reading of an image on the continuous transfer medium and determine a quality of the image on the continuous transfer medium based on the result of reading, wherein when an image is determined to be defective on the transfer medium having the position mark printed thereon, information on the position mark of the image determined to be defective is notified.