Intelligent Cash Drawer Open-Drawer Weight Measurement
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Solution Overview
Problem
Conventional intelligent cash drawer units inaccurately measure cash when items are poorly placed, leading to incorrect readings and reduced accuracy during large cash transactions or float operations, as they require the drawer to be closed for accurate weighing, which can result in inefficiencies and errors.
Innovation Solution
The intelligent cash drawer unit processes signals from transducers while the drawer is open to detect poorly placed cash and allows for stepwise addition or removal of cash, enabling accurate measurements and reducing the need for frequent drawer closures, using a signal processor to differentiate between stable and unstable readings and store them for later validation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the drawer is closed for weighing to ensure accurate measurements, then measurement precision is improved, but productivity deteriorates due to frequent drawer closures during cash transactions
Solution Approach 1:
The patent inverts the conventional approach by enabling weight measurements to be taken when the drawer is open rather than closed. The signal processor is configured to process transducer signals and determine cash weight even during open drawer operations, allowing transactions to proceed without repeated drawer closures while maintaining measurement accuracy through advanced signal processing techniques that filter out instability transients.
2Productivity
If the drawer remains open during cash operations, then productivity is improved by reducing closure frequency, but measurement precision deteriorates due to unstable readings from mechanical shocks
Solution Approach 1:
The patent implements feedback mechanisms where the signal processor continuously monitors weight readings and identifies unstable periods caused by mechanical shocks. The system uses feedback loops to detect transient instabilities and excludes these readings from the final weight calculation, ensuring accurate measurements are taken only when the drawer is in a stable state, thus maintaining precision while allowing the drawer to remain open during transactions.
Solution Approach 2:
The system performs preliminary assessment of reading stability before finalizing weight measurements. The signal processor evaluates consecutive readings to determine if they fall within acceptable stability margins, and only then proceeds to use these readings for weight determination. This preliminary validation ensures that measurements are taken from stable conditions while minimizing the need for drawer closures.
3Measurement precision
If conventional weighing methods are used with closed drawer requirement, then measurement precision is maintained, but loss of time increases due to repeated opening and closing operations
Solution Approach 1:
The patent enables continuous weight monitoring and measurement throughout the drawer operation cycle. The transducers continuously provide weight signals to the signal processor, which processes these signals in real-time regardless of drawer position. This continuous measurement capability eliminates the need to stop transactions for repeated drawer closures, maintaining measurement precision while ensuring uninterrupted cash handling operations.
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 approach enhances the accuracy and speed of cash transactions by allowing for open drawer operations, reducing errors, and improving the reliability of cash management, especially during busy periods or when handling large quantities of cash.
Implementation Method 1
A transducer underneath each cup reads out a continuous analogue signal that represents the weight of the cup and its contents. This analogue signal is digitized and passed to a signal processor which can compute the weight of the cash contained in the cup.
Data Source
AI summary
An intelligent cash drawer unit or cash register is operable to process signals from load cells beneath note/coin cups when the drawer is open. It then determines the weight/value of cash in the cups, in order to either (a) detect an accurate weight in a cup comprising a poorly placed note, or (b) allow a float to be added, or a lift to be made, stepwise, whilst the drawer remains open. An intelligent cash drawer unit or cash register is also described which can detect a poorly placed note, by either (a) comparing signals from the load cells when the drawer is open, and when the drawer is closed or (b) monitoring stable readings, over a predetermined period when the drawer is closed and comparing the monitored values and where the apparent weight determined by the transducer appears to reduce by more than a predetermined amount, determining that a note is poorly placed.