Duplex Printing Image Offset Correction via Optical Sensing
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Solution Overview
Problem
Duplex printing devices face challenges in maintaining image alignment across different paper widths, leading to shifts or truncation of transfer print information due to the high manufacturing cost and vulnerability of the switching toggle lever linkage structure.
Innovation Solution
The duplex printing device employs an image offset correction method that calculates position deviation information from first side alignment and second side deviation images, adjusting the light sensing position of the image processing device to center the transfer print information on the second side of the paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a switching toggle lever linkage structure is used to adjust paper width, then image alignment on different paper widths is improved, but manufacturing cost increases and device vulnerability increases
Solution Approach 1:
The patent replaces the mechanical switching toggle lever linkage structure with an image processing approach. Instead of physically adjusting the paper input tray position mechanically, the system captures images of the paper, detects position deviation, and uses software algorithms to calculate and correct the offset. This substitutes a complex mechanical adjustment system with an optical sensing and computational correction system.
Solution Approach 2:
The patent uses image copying and comparison to detect paper position deviation. By capturing an image of the paper's first side during initial feeding and comparing it with the image of the second side during duplex printing, the system creates a digital reference copy to measure and correct positional offsets without physical mechanical adjustment.
2Manufacturing precision
If a switching toggle lever linkage structure is used to adjust paper width, then image alignment on different paper widths is improved, but maintenance difficulty increases
Solution Approach 1:
The patent eliminates the need for mechanical maintenance by replacing the switching toggle lever linkage structure with an image-based detection and correction system. The maintenance-free optical and software system continuously monitors and corrects paper position deviations without any moving mechanical parts that require adjustment, lubrication, or replacement.
3Device complexity
If the mechanical design is removed to reduce cost and complexity, then device simplicity is improved, but image alignment deteriorates causing transfer print information to shift or truncate
Solution Approach 1:
The patent implements a feedback control system where the image processing device continuously monitors paper position during duplex printing. The system detects position deviation of the second side relative to the first side, calculates the offset amount, and feeds this information back to adjust the printing position accordingly, ensuring accurate image alignment without mechanical adjustment mechanisms.
Solution Approach 2:
The patent substitutes mechanical position adjustment with optical detection and software-based position correction. Instead of using physical mechanisms to maintain alignment, the system uses image sensors to detect deviations and computational algorithms to correct the printing position, achieving precise alignment through information processing rather than mechanical means.
Data Source
AI summary
A duplex printing device and an image offset correction method thereof are provided. In the duplex printing device, a paper medium is induced to pass through an image processing device by a first path and a second path respectively, and a processor calculates, drives and performs image processing technologies. When the paper medium passes through the first path and the second path, the first side alignment image and the second side deviation image of the paper medium are respectively obtained, and position deviation information is calculated according to the first side alignment image and the second side deviation image, and the light sensing position of the image processing device is adjusted to change a transfer print starting point according to the position deviation information. Thus, during next printing, transfer print information may be located on the center position of the second side of the paper medium with any size.