Handheld Printer Guide Roller Displacement for Sensor Distance Control
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Solution Overview
Problem
Existing handheld printing apparatuses face image quality deterioration due to varying distances between the position detection sensor and the print medium, especially when there are voids between protrusions and the print paper, leading to inconsistent image formation.
Innovation Solution
A handheld printing apparatus with a guide unit and detection unit configuration that allows the guide unit to displace relative to the detection unit in a direction orthogonal to the print surface, maintaining a consistent working distance and using position detection sensors to accurately measure the relative movement between the printing apparatus and the print medium, ensuring precise ink ejection and image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the position detection sensor is fixed at a constant height from the rollers, then the structure is simple and easy to manufacture, but the distance between the sensor and print medium varies when voids are present, deteriorating image quality
Solution Approach 1:
The guide unit is designed to be movable relative to the detection unit in the vertical direction, allowing the system to dynamically adjust to variations in print medium thickness and voids. This dynamic configuration maintains a substantially constant distance between the detection unit and the print medium surface, resolving the contradiction between simple fixed mounting and consistent distance measurement.
Solution Approach 2:
The system changes the vertical position parameter of the guide unit relative to the detection unit to compensate for voids and thickness variations. By adjusting this parameter, the distance between the detection unit and print medium surface is maintained within a substantially constant range, ensuring accurate position detection despite variations in print medium characteristics.
2Stability of the object's composition
If the guide unit is fixed relative to the detection unit, then the structure is stable and simple, but it cannot accommodate voids between protrusion and print paper, leading to image quality deterioration
Solution Approach 1:
The guide unit is configured to move vertically relative to the detection unit while maintaining horizontal alignment. This dynamic capability allows the system to accommodate voids and thickness variations in the print medium without compromising structural stability, thereby maintaining reliable image quality across different printing conditions.
Solution Approach 2:
The printing apparatus is divided into independently movable components: the detection unit remains relatively fixed while the guide unit can move vertically. This segmentation allows each component to perform its specific function optimally - the detection unit provides stable reference while the guide unit adapts to print medium variations, resolving the contradiction between structural stability and reliability.
3Adaptability or versatility
If the distance between detection sensor and print medium varies, then the apparatus can accommodate different print medium thicknesses, but image quality deteriorates due to inconsistent detection accuracy
Solution Approach 1:
The movable guide unit dynamically adjusts its vertical position to maintain a substantially constant distance from the print medium surface regardless of print medium thickness or voids. This dynamic adjustment ensures that the detection unit maintains accurate measurement capability while the system adapts to different print medium characteristics.
Solution Approach 2:
The guide unit acts as an intermediary between the fixed detection unit and the variable print medium surface. By moving vertically to compensate for thickness variations and voids, the guide unit mediates the interaction between the sensor and print medium, maintaining consistent detection accuracy while accommodating different print medium characteristics.
Data Source
AI summary
Provided is a manually scanned printing apparatus capable of suppressing deterioration in image quality. To provide this, a support portion of a guide roller and a support portion of a downstream position detection sensor are configured to be displaceable relative to each other in a direction substantially orthogonal to the printing surface of a print medium to be printed.