Image Position Correction for Front-to-Back Misregistration
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately correcting front-to-back misregistration between the first and second sides of a recording medium, particularly due to deviations in detecting the image position.
Innovation Solution
The apparatus includes a conveyance device, a printing device, an image reading device, and circuitry that detects changes in the print position relative to a target position, corrects the image position based on these changes, and determines the image position on the second side by accounting for deviations on the first side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image reading device reads the print position based on the formed image, then the position information can be obtained, but deviations occur due to detection errors and post-printing changes
Solution Approach 1:
The system performs preliminary actions by detecting the print position immediately after image formation while the recording medium is still in a stable state. The circuitry captures position information before post-printing deviations can occur, allowing for corrective measures to be taken in advance for subsequent printing operations.
Solution Approach 2:
The system implements feedback by using the detected print position information to correct deviations in subsequent image formations. The circuitry processes the detected position data and adjusts the image position for the second side based on the detected deviations, creating a closed-loop system that continuously improves registration accuracy.
2Manufacturing precision
If the circuitry corrects the image position based on detected changes, then registration accuracy improves, but the complexity of the control system increases
Solution Approach 1:
The system performs self-service by automatically detecting and correcting position deviations without requiring external intervention. The circuitry autonomously processes the detected print position information, calculates necessary corrections, and adjusts subsequent image formations, eliminating the need for manual calibration or external adjustment mechanisms.
Solution Approach 2:
The system replaces complex mechanical adjustment mechanisms with an electronic control approach. Instead of using physical mechanisms to compensate for deviations, the circuitry uses software-based correction algorithms that process detected position data and automatically adjust image formation parameters, simplifying the overall system architecture.
3Manufacturing precision
If the apparatus determines image position on the second side based on deviations from the first side, then front-to-back misregistration is reduced, but the difficulty of detecting and measuring increases
Solution Approach 1:
The circuitry acts as an intermediary that processes the raw detected position information and converts it into meaningful deviation data. It mediates between the detected print position and the target position, calculating the deviations and translating them into correction values for subsequent image formations, thereby simplifying the measurement and control process.
Solution Approach 2:
The system changes parameters by transforming the detected position data into deviation values that can be directly used for correction. The circuitry processes the raw measurement data and converts it into meaningful correction parameters, making the deviation measurement and subsequent correction operations more straightforward and accurate.
Data Source
AI summary
An image forming apparatus includes a conveyance device, a printing device, an image reading device, and circuitry. The image reading device reads a print position based on an image formed by the printing device. The circuitry detects an amount of change in the print position that is read relative to a target print position. The circuitry corrects an image position based on the detected amount of change. The image position is a position of an image to be formed on the recording medium in subsequent image formations. The circuitry determines the image position on the second side of the recording medium based on deviations of the print position on the first side of the recording medium from the target print position. The deviations include a deviation at a time of printing the first side, and a post-printing deviation after printing and are the detected amount of change.