Image Forming Apparatus Center Position Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately adjusting the position of print target images in the width direction due to deviations in the center position detection, often requiring visual confirmation of overlapping test images which can be error-prone.
Innovation Solution
The method involves using a black reference member and an image sensor unit to detect edge positions and execute a center position calibration process, forming test images with black patch images and line segment images to correct the reference center position without visual confirmation, ensuring precise alignment and preventing ink ejection onto the reference surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual confirmation of overlapping test images is used to correct center position deviation, then the center position can be adjusted, but the process becomes error-prone and requires manual intervention
Solution Approach 1:
The patent replaces the manual visual confirmation process with an automated image processing system. The image processing device automatically detects the positions of multiple scale images, calculates their overlapping state, and determines the center position deviation without requiring human visual inspection. This substitutes the mechanical/manual operation with an automated optical-detection-and-processing system.
Solution Approach 2:
The system performs self-correction by automatically detecting its own center position deviation and calculating the necessary correction. The image processing device analyzes the overlapping state of scale images formed on the sheet, computes the deviation amount, and generates correction data that is fed back to adjust the edge detection portion's center position, enabling the system to self-correct without external intervention.
2Measurement precision
If test images are formed on both surfaces of the sheet to correct center position deviation, then accuracy is improved, but the process becomes more complex and time-consuming
Solution Approach 1:
The patent uses the same image forming apparatus and detection system to perform multiple functions: forming the test scale images on both sheet surfaces, detecting the edge positions, analyzing the overlapping state, and calculating the center position deviation. This multi-functional approach eliminates the need for separate correction devices or complex additional equipment, reducing overall system complexity while maintaining high measurement precision.
Solution Approach 2:
The system establishes a feedback loop where the image processing device continuously monitors the overlapping state of scale images formed on both sheet surfaces, calculates the center position deviation, and automatically adjusts the edge detection portion's center position based on this feedback. This closed-loop control simplifies the correction process by making it automatic and iterative rather than manual and sequential.
3Productivity
If the reference center position is not accurately calibrated, then image formation speed is maintained, but ink misalignment occurs and image quality deteriorates
Solution Approach 1:
The patent performs preliminary calibration of the reference center position by forming test scale images, detecting their positions, calculating the center position deviation, and adjusting the edge detection portion before actual image formation begins. This preliminary action ensures that the reference center position is accurately calibrated in advance, preventing ink misalignment during production while maintaining efficient image formation speed.
Solution Approach 2:
The system uses feedback from the detected overlapping state of scale images to automatically adjust the reference center position. The image processing device calculates the deviation based on the actual positions of scale images and feeds this information back to correct the reference center position, ensuring accurate image alignment without compromising production speed through manual trial-and-error adjustments.
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 allows for accurate setting of the center position in the width direction, correcting deviations in the image forming apparatus, and preventing ink misalignment, thereby ensuring high-quality image formation without the need for visual confirmation of test image overlaps.
Implementation Method 1
emits detection light toward the reference surface and detects an amount of reflected light of the detection light
Data Source
AI summary
A processor causes a sheet conveying device to execute a process of conveying a target sheet in a state in which a specific surface on which a first test image including a plurality of black patch images arranged in a stepwise manner is formed serves as a printing surface. The processor supplies data of a second test image including a plurality of line segment images corresponding to the plurality of black patch images to an image processing device as reference image data, and acquires information on a test interference position, which is a position where a second test image interferes with a mask area corresponding to the plurality of black patch images. The processor sets a reference center position according to the test interference position.