Spectral Characteristic Acquisition Apparatus Stable Sheet Positioning
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Solution Overview
Problem
Conventional spectral-characteristic acquisition apparatuses face challenges in maintaining a stable stop position for the recording medium during measurement, especially when the sheet type or thickness varies, leading to misalignment and reduced precision in color data acquisition.
Innovation Solution
The apparatus employs a conveyance system with multiple sheet conveyors and sensors that control the sheet's movement and tension, ensuring stable positioning by stopping the sheet conveyor as soon as the leading end is detected and applying pressure to smooth out wrinkles, while using a transformation matrix to calculate spectral characteristics based on color data from multiple spectral sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional sheet conveyance method is used, then the apparatus structure is simple, but the stop position of the measurable area shifts when sheet type or thickness varies
Solution Approach 1:
The patent implements a feedback control mechanism where the position of the measurable area is continuously monitored and the conveyance system automatically adjusts to maintain the correct position. When sheet type or thickness variations occur, the system detects the position shift and compensates by adjusting the conveyance speed or position of the measurable area, ensuring accurate spectral measurement despite material variations.
Solution Approach 2:
The patent employs dynamic adjustment capabilities in the conveyance system, allowing real-time modification of conveyance parameters based on detected sheet properties. The system can dynamically change the speed, position, or tension of the sheet during conveyance to maintain optimal measurement conditions, transforming a static conveyance system into an adaptive one that responds to varying sheet characteristics.
2Measurement precision
If the sheet conveyor continues rotating during measurement, then the measurement process is continuous, but the sheet cannot be in full contact with the reference plane
Solution Approach 1:
The patent implements periodic stopping and resuming of the sheet conveyor during the measurement process. The conveyor stops momentarily to allow the sheet to achieve full contact with the reference plane for accurate measurement, then resumes operation. This periodic action ensures high-quality contact during measurement while maintaining overall measurement continuity through rapid stop-start cycles that minimize interruption to the measurement workflow.
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 precise and stable acquisition of spectral characteristics across different sheet types and thicknesses, reducing misalignment and improving measurement accuracy without damaging the sheet.
Implementation Method 1
measures the colors of an image in a measurable area
Implementation Method 2
spectral sensor that receives the light and outputs color data
Implementation Method 3
The frictional force that acts on the sheet 100 varies depending on the sheet type or the thickness of the sheet 100
Implementation Method 4
applying pressure to smooth out wrinkles
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A spectral-characteristic acquisition apparatus (10) and a method of obtaining spectral characteristics. The spectral-characteristic acquisition apparatus (10) includes a conveyor (30, 31, 32) including a first conveyance roller pair disposed in a conveyance direction in which an object (100) is conveyed and a second conveyance roller pair disposed downstream from the first conveyance roller pair in the conveyance direction, a sensor (42) configured to detect that the object (100) has reached the second conveyance roller pair, a controller (300) configured to control the second conveyance roller pair to drive by a predetermined amount with a driving force greater than a driving force of the first conveyance roller pair upon detecting that the object (100) has reached the second conveyance roller pair by the sensor (42), and to stop driving, a color data obtainer (20) configured to obtain color data from the object (100) at a position where the object (100) stops moving, and a spectral-characteristic computing unit (113) configured to estimate a spectral characteristic of the object (100) based on the color data obtained by the color data obtainer (20).