Reading Device Positioning Structural Member Vibration Control
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Solution Overview
Problem
Existing reading devices experience vibration issues between the reading unit and the retainer during movement, affecting the stability and accuracy of reading information on a transparent flat plate, especially when a positioning structural member is not provided.
Innovation Solution
Incorporating a positioning structural member at the ends of the reading unit and retainer, which includes a pair of fixed sections and contact sections, to maintain the reading unit in a displaceable position relative to the retainer in the direction closer to and away from the transparent flat plate, while preventing movement-related vibrations upstream and downstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positioning structural member is not provided, then the reading unit can move freely relative to the retainer, but vibration occurs during reading that affects stability and accuracy
Solution Approach 1:
The positioning structural member is divided into multiple contact sections (first contact section and second contact section) that separately engage with corresponding positioning sections on the retainer. This segmentation allows the reading unit to be positioned at multiple discrete locations along the movement direction, providing stability while maintaining a relatively simple overall structure.
Solution Approach 2:
The positioning structural member features asymmetric positioning sections with different engagement characteristics upstream and downstream of the reading unit. This asymmetric design prevents vibration by providing differential positioning constraints that stabilize the reading unit during movement while allowing necessary displacement freedom in other directions.
2Measurement precision
If the reading unit is constrained to prevent vibration, then reading accuracy improves, but the reading unit loses ability to adjust position relative to the transparent flat plate
Solution Approach 1:
The positioning system uses discrete contact sections rather than continuous constraint, allowing the reading unit to be positioned at specific locations while maintaining freedom to adjust its vertical position relative to the transparent flat plate. This segmentation enables selective constraint in the movement direction while preserving adaptability in the vertical direction.
Solution Approach 2:
The positioning structural member provides dynamic positioning that adapts to different reading scenarios. The contact sections engage to prevent vibration during active reading, while the overall structure allows the reading unit to maintain adjustable vertical positioning relative to the transparent flat plate, combining constraint and flexibility.
Data Source
AI summary
A reading device includes: a transparent flat plate with an upper surface on which an object to be read is placed; a reading unit reading information on the object while moving in contact with a transparent flat plate lower surface; a retainer retaining the reading unit by urging the reading unit to be pressed against the lower surface; a guide member supporting and guiding the retainer along a movement direction at a time of reading by the reading unit; and a positioning structural member in at least one end of the reading unit and the retainer in a direction crossing the movement direction to position the reading unit to be maintained being displaceable relative to the retainer in a direction to be closer to and in a direction to be away from the transparent flat plate and being non-displaceable upstream and downstream in the movement direction.