MFP Cutting Position Correction via Test Image Feedback
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Solution Overview
Problem
Existing multifunction peripherals fail to accurately cut recording media due to individual differences in apparatuses, such as bending of the recording medium on the conveying path, which affects the cutting position.
Innovation Solution
A multifunction peripheral system that includes a conveyor, a recording device, a cutter, and a reading device, controlled by a controller that performs test recording, reading, and correction processing to generate correction data for precise cutting based on the difference between the actual and ideal lengths of the recording medium, considering the bending and conveying path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a correction value inherent to each type of paper is added to the amount of rotation of a conveying roller, then the cutting position accuracy is improved for different paper types, but the device complexity increases due to the need to store and apply multiple correction values
Solution Approach 1:
The system performs self-calibration by automatically measuring the actual cutting position using the reading device and computing the correction value through image processing, eliminating the need for manual correction value input or extensive pre-programming of paper-type-specific parameters
Solution Approach 2:
The reading device captures the actual cutting position, and the controller compares it with the intended position to compute a correction value that is then applied to subsequent cutting operations, creating a closed-loop feedback system that continuously improves cutting accuracy
Solution Approach 3:
The system dynamically adjusts the cutting position parameter based on the computed correction value, which accounts for individual apparatus characteristics and paper type variations, allowing flexible adaptation without hardcoding multiple correction values
2Manufacturing precision
If the cutter is positioned to account for bending of the recording medium on the conveying path, then the cutting position accuracy is improved, but the device complexity increases due to additional measurement and calculation requirements
Solution Approach 1:
The reading device acts as an intermediary that objectively measures the actual cutting position and the positions of reference marks on the recording medium, providing data that the controller uses to compute the correction value without requiring complex mechanical sensors or additional hardware
Solution Approach 2:
The system replaces complex mechanical measurement devices with an optical reading device that captures images of the recording medium, using image processing algorithms to determine positions and compute corrections, thereby simplifying the physical hardware while maintaining measurement capability
3Manufacturing precision
If test recording and reading processing are performed to generate correction data, then the cutting position accuracy is improved, but the productivity decreases due to additional processing steps
Solution Approach 1:
The correction value computation is performed in advance during an initial calibration phase or when paper type changes, rather than for every single cutting operation. This preliminary action establishes correction data that can be reused for multiple subsequent operations, reducing the time penalty
Solution Approach 2:
The system performs correction value computation only when necessary (e.g., when paper type changes or initial calibration is needed), rather than continuously for every cutting operation. This partial application of the correction process maintains accuracy while minimizing productivity impact
Data Source
AI summary
A multifunction peripheral includes: a conveyor reeling out a recording medium from a roll medium and conveying the recording medium; a recording device; a cutter; a reading device; and a controller configured to: record a test image on the recording medium and cut the recording medium to form a rear end of the recording medium; generate read data of the test image; generate correction data relating to a cutting position of the recording medium based on a difference between a length obtained from the generated read data and an ideal value of the length; and record an image on the recording medium based on a recording command and cut the recording medium in a cutting position based on image data included in the recording command and the correction data to form the rear end of the recording medium.