Lifted Scale Tray Control for Weight Sensor Overload Protection
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Solution Overview
Problem
Digital scales in transaction terminals are prone to damage from scale overload due to sudden weight drops or exceeding capacity, leading to costly replacement of multiple sensors when even a single sensor is damaged.
Innovation Solution
A digital scale with a lift apparatus that raises and lowers a top tray off or onto weight sensors based on transaction data and terminal state, protecting sensors from excessive weight and sudden drops by locking the tray in an elevated position when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tray is kept in contact with weight sensors for weighing items, then weighing function is enabled, but sensors are vulnerable to damage from overload and sudden drops
Solution Approach 1:
The lift apparatus is activated in advance to raise the tray before items are placed on the scale, preventing potential overload damage before it can occur. The system proactively positions the tray in a protected state based on predicted weighing needs, rather than reacting after damage occurs.
Solution Approach 2:
The lift apparatus acts as an intermediary mechanism between the tray and weight sensors, controlling their relative positioning. By introducing this intermediate device, the system can decouple the tray from direct contact with sensors when protection is needed, while maintaining contact when weighing is required.
2Measurement precision
If multiple weight sensors are used for weighing, then measurement accuracy is improved, but replacement cost increases when even one sensor is damaged
Solution Approach 1:
The lift apparatus provides beforehand cushioning by preventing overload conditions that would damage sensors. By raising the tray before excessive weight is applied, the system cushiones the sensors against potential damage, ensuring they maintain measurement precision without incurring replacement costs.
3Duration of action of stationary object
If the tray is raised to protect sensors from overload, then sensor lifespan is extended, but weighing capability is lost
Solution Approach 1:
The system dynamically adjusts the tray position based on real-time conditions. The lift apparatus continuously moves the tray between raised (protected) and lowered (weighing) positions according to whether items are being placed on the scale or weighed, making the protection mechanism adaptive rather than static.
Solution Approach 2:
The lift apparatus performs periodic actions of raising and lowering the tray in rhythm with the weighing process. It raises the tray during periods when items are being handled (protection phase) and lowers it during periods when weighing is needed (measurement phase), creating a periodic cycle that balances protection and functionality.
Data Source
AI summary
A digital scale includes a lift apparatus configured to lift a top tray of the scale off weight sensors of the scale in order to prevent any potential damage and/or malfunction of the weight sensors due to excessive weight on the tray and/or due to a sudden drop of a heavy item onto the top tray. During a transaction at a terminal, an expected weight of a scanned item and/or a current weight of existing items on the tray is used to determine whether the tray is to be lifted off the sensors by the lift apparatus before the item is placed on the tray. Once the tray is lifted off the sensors and the scanned item is placed onto the top tray, the lift apparatus may slowly lower the tray back onto the weight sensors to enable a weight measurement of the item to be recorded.