Image-Forming Apparatus Evaluation Patterns for Print Misalignment Diagnosis
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Solution Overview
Problem
Print position misalignment in image forming apparatuses leads to prolonged downtime due to the need for trial and error in identifying the faulty component, as customer engineers check multiple parts to determine the cause.
Innovation Solution
An image forming apparatus equipped with processing circuitry and a sensor that forms an evaluation pattern, measures its image, and presents a determination result based on a comparison between a reference and measured value, allowing for quick identification of the cause of misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If customer engineers manually check multiple components through trial and error to identify print position misalignment causes, then they can determine the faulty part, but the repair time increases significantly
Solution Approach 1:
The system performs preliminary diagnostic actions by automatically forming evaluation patterns and measuring their positions before repair decisions are made. The processing circuitry forms evaluation patterns at predetermined positions and the measurement unit measures their actual positions, allowing the system to proactively identify misalignment causes rather than waiting for manual trial-and-error detection
Solution Approach 2:
The patent replaces the mechanical manual inspection process with an automated optical measurement system. Instead of customer engineers physically checking components, the system uses a measurement unit to detect evaluation patterns and processing circuitry to analyze position data, substituting human mechanical inspection with automated optical-electrical measurement and analysis
2Ease of repair
If customer engineers replace components based on trial and error methodology, then they can resolve the misalignment issue, but the functional downtime for users increases
Solution Approach 1:
The system performs self-diagnosis by automatically forming evaluation patterns, measuring their positions, and determining the cause of misalignment without requiring external expert intervention. The processing circuitry analyzes the measured positions and identifies whether the issue lies in the paper feed unit, conveyance path, or other components, enabling the system to self-identify problems that would otherwise require customer engineer expertise
Solution Approach 2:
The system establishes a feedback loop where evaluation patterns are formed, measured, and analyzed to generate diagnostic information about misalignment causes. This feedback mechanism provides immediate information about system status and fault locations, replacing the iterative trial-and-error feedback process with direct diagnostic feedback
Data Source
AI summary
An image forming apparatus includes processing circuitry and a sensor. The processing circuitry controls formation of an image of an evaluation pattern on a transfer object. The sensor measures the image of the evaluation pattern formed on the transfer object. The processing circuitry presents a determination result of a cause of a failure based on a comparison between a reference value serving as a reference of the evaluation pattern and a measured value of the image of the evaluation pattern by the sensor.