Rail-Guided Carrier Track Layout for Dual Mark Recognition
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Solution Overview
Problem
Conventional tracked cart systems face challenges in disposing two types of marks on rails without increasing the cart's size, as they typically have only one surface for mark disposition, limiting sensor placement and functionality.
Innovation Solution
The system employs a track design with first and second surfaces on each rail, allowing two types of marks to be disposed on the same location, with the second surface inclined towards the cart, and incorporates sensors to detect these marks without protruding, maintaining cart size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If two types of marks are disposed on the same location of the rail, then the information detection capability is improved, but the sensor size and cart dimensions increase
Solution Approach 1:
The patent applies dimensionality change by utilizing the vertical dimension (rail surface orientation) to accommodate multiple marks at the same horizontal location. The rail is designed with a first surface and a second surface inclined relative to each other, allowing different marks to be placed on different surfaces while being detected by sensors of different sizes. This resolves the contradiction by enabling multi-information detection without proportionally increasing cart volume.
Solution Approach 2:
The patent applies local quality by making the second surface of the rail inclined specifically at locations where multiple types of marks need to be disposed. This localized inclination allows the second sensor to detect the second mark without requiring a large protruding structure, while the first sensor continues to detect the first mark on the first surface. This resolves the contradiction by providing local geometric variation that enables compact sensor arrangement.
2Adaptability or versatility
If the second surface is disposed outside the first surface and inclined towards the cart, then two types of marks can be disposed on the same location, but the rail structure complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the rail surface into distinct first and second surfaces with different orientations. The first surface faces the first sensor and the second surface (inclined relative to the first) faces the second sensor. This segmentation allows independent optimization of each surface for its specific mark type, enabling versatile mark disposition while maintaining manageable structural complexity through clear functional separation.
3Measurement precision
If the sensor is configured to face the mark on an inclined surface, then accurate position recognition is achieved, but the sensor mounting structure becomes more complex
Solution Approach 1:
The patent applies dimensionality change by utilizing the inclined second surface of the rail to provide the necessary detection angle for the second sensor. Instead of making the sensor protrude horizontally to face an inclined mark, the sensor is mounted on the cart body facing the inclined surface, leveraging the vertical/angular dimension. This achieves accurate position recognition while keeping the sensor mounting structure compact and integrated into the cart body.
Data Source
AI summary
The overhead traveling vehicle system includes a track having a plurality of first rails extending in an X direction and a plurality of second rails extending in a Y direction arranged in a grid, and a traveling vehicle traveling on a pair of the first rails adjacent to each other in the Y direction and traveling on a pair of the second rails adjacent to each other in the X direction, in which each of the first rail and the second rail has a first surface on which a cell recognition mark is disposed and a second surface on which a position recognition mark is disposed, the second surface, when viewed from a center of a cell in plan view, being disposed outside the first surface and being inclined toward the traveling vehicle side with respect to the first surface.