Image Recording Device Orthogonal Edge Position Correction
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Solution Overview
Problem
Existing image recording devices face challenges in suppressing orthogonal misalignment of images, especially when recording long sheets, as skew correction at the leading end does not effectively address misalignment at the trailing end, leading to difficulties in maintaining image alignment.
Innovation Solution
An image recording device equipped with a conveyance mechanism, a head for recording images, a moving mechanism to adjust the head's position based on detected edge positions, and a controller to derive and apply correction amounts, ensuring accurate image alignment across the sheet by continuously monitoring and correcting the recording position in the orthogonal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If skew correction is performed only at the leading end portion of the sheet, then the correction process is simple, but the orthogonal misalignment becomes greater at the trailing end portion
Solution Approach 1:
The sheet is divided into multiple scanning areas (leading end, intermediate, trailing end), and skew correction is applied separately to each area based on detected edge positions. This segmentation allows different correction amounts to be applied to different portions of the sheet, resolving the contradiction by maintaining simple correction processes while achieving precision across the entire sheet length.
Solution Approach 2:
Different correction amounts are applied to different scanning areas based on their specific edge positions. The leading end area receives one correction amount, intermediate areas receive different correction amounts, and the trailing end area receives yet another correction amount. This local quality approach ensures that each area is corrected according to its specific needs, achieving overall precision without overly complicating the correction process.
2Length of moving object
If the sheet length is increased, then the recording capacity is improved, but the orthogonal misalignment becomes more difficult to control
Solution Approach 1:
The long sheet is divided into multiple scanning areas along the conveyance direction. Each scanning area is independently corrected based on its detected orthogonal edge position. This segmentation allows the system to maintain precision control across the entire length of the sheet by treating each segment separately, thus resolving the contradiction between increased sheet length and maintained alignment precision.
Solution Approach 2:
The orthogonal edge positions of all scanning areas are detected and correction amounts are calculated before the actual recording process. This preliminary action allows the system to pre-determine the appropriate corrections for each scanning area, ensuring that even long sheets can be accurately corrected without compromising precision during the recording process.
3Manufacturing precision
If correction amounts are adjusted for each scanning area, then image alignment precision is improved, but the control process becomes more complex
Solution Approach 1:
The system detects the actual orthogonal edge positions of the sheet and uses this feedback information to calculate appropriate correction amounts for each scanning area. This feedback mechanism allows the system to automatically adjust corrections based on actual sheet conditions, achieving high precision without requiring complex manual control processes. The feedback loop simplifies the control process by making it adaptive and automatic.
Solution Approach 2:
The correction amounts for each scanning area are dynamically adjusted based on the detected edge positions. By changing the correction parameters according to actual measurements, the system achieves high image alignment precision while keeping the control process relatively simple. The parameter changes are automatically calculated and applied, avoiding the need for complex manual adjustments.
Data Source
AI summary
An image recording device comprises a conveyance mechanism configured to convey a recording medium in a conveyance direction, a head configured to record an image, a moving mechanism configured to move the head with respect to the conveyance mechanism in an orthogonal direction orthogonal to the conveyance direction, a sensor configured to detect a position of an orthogonal edge that is an edge of the recording medium in a direction orthogonal to the conveyance direction, and a controller. The controller is configured to perform deriving a correction amount for a recording position of the head in the orthogonal direction based on the edge position detected by the sensor, correcting the recording position of the head by driving the moving mechanism to move the head based on the correction amount, and causing the head to record an image based on image data at the corrected recording position.