Load Positioning Roller Mechanism for Cassette Deviation Correction
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Solution Overview
Problem
Conventional load positioning apparatuses for correcting positional deviations of heavy cassettes containing thin sheet-like substrates require a driving source, leading to high equipment costs and potential control system breakdowns, and are unsuitable for handling large, heavy cassettes due to the need for lateral movement on a supporting surface.
Innovation Solution
A load positioning apparatus with a movable table that can move horizontally, a load supporting portion allowing lateral movement, and a load positioning roller supported by a horizontal shaft, which corrects positional deviations without a driving source by using the weight of the load and urging force to push the cassette back to the fixed position, eliminating the need for lateral movement on the supporting surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a load positioning apparatus with a driving source is used to push the load toward the fixed position, then the positioning accuracy is improved, but the equipment cost increases and control system complexity increases
Solution Approach 1:
The invention extracts and removes the driving source from the load positioning apparatus, retaining only the essential mechanical components (pusher, guide rails, supporting board) needed for positioning. This eliminates the complex control system while maintaining positioning functionality through the weight-based mechanism.
Solution Approach 2:
The load itself provides the driving force for positioning through its weight. As the load is lowered vertically, its weight automatically activates the pusher mechanism to correct positional deviations, eliminating the need for an external driving source and control system.
2Device complexity
If the load positioning apparatus uses the weight of the load to drive the pusher, then the equipment cost is reduced, but the heavy load cannot be horizontally moved smoothly on the supporting surface
Solution Approach 1:
The invention changes the movement paradigm from horizontal sliding friction to vertical gravitational action. The load moves vertically along guide rails while the pusher applies horizontal correcting forces, separating the weight-bearing function from the positioning function and enabling smooth operation with heavy loads.
Solution Approach 2:
The positioning system is segmented into independent functional components: vertical guidance (guide rails), horizontal positioning (pusher), and support (supporting board). This segmentation allows each component to perform its specific function optimally without the limitations of integrated horizontal sliding mechanisms.
3Manufacturing precision
If multiple load positioning apparatuses are disposed around the supporting board to correct deviations in multiple directions, then the positioning accuracy in both X and Y directions is improved, but the device complexity and control system requirements increase
Solution Approach 1:
The load positioning apparatus is designed with universal functionality to correct positional deviations in any direction. The pusher mechanism can operate effectively regardless of the deviation direction, and multiple identical units can be deployed around the supporting board without increasing control system complexity, as each unit operates independently using the load's weight.
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 solution reduces production costs, prevents control system breakdowns, and allows for smooth handling of heavy cassettes by eliminating the need for lateral movement on the supporting surface, effectively correcting positional deviations in both X and Y directions.
Implementation Method 1
a movable-table urging means for urging and holding the movable table at a forward limit position
Implementation Method 2
an apparatus that does not need a driving source and that is of a type that drives a pusher (roller) that pushes a load toward a fixed position by use of the weight of the load vertically lowered by a transfer apparatus
Data Source
AI summary
A load positioning apparatus includes a movable table that is urged and held at a forward limit position by a movable-table urging element, a load-supporting roller that allows the load to laterally move on a horizontal surface, and a load-positioning roller that is supported on the movable table and adjoins the side face of the load supported in the fixed position on the load supporting roller. The urging element allows the table to recede together with the load-positioning roller when a load is vertically lowered at a position where the load-positioning roller is pushed outwardly with respect to the fixed position. The urging element has an urging force sufficient to return the movable table to the forward limit position so as to push back the load to the fixed position via the load positioning roller.