Electrical Resistance Moisture Detection for ATM Banknote Jam Prevention
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Solution Overview
Problem
Self-Service Terminals (SSTs) face issues with media item jams and fraudulent activities due to the deposition of wet banknotes, which lead to system failures and increased servicing costs.
Innovation Solution
A method and apparatus that determine the moisture content of media items by using electrical contact elements and a processor to measure electrical resistance, allowing for the detection and rejection of wet media items before they cause jams, incorporating a simple and cost-effective design for easy installation in existing SSTs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wet banknotes are deposited at the ATM, then the criminal can attempt to cause a jam within the ATM, but the ATM lacks the capability to detect and reject wet media items
Solution Approach 1:
The patent replaces complex mechanical or optical moisture detection systems with a simple electrical resistance measurement system. Two electrical contact elements measure the resistance of the banknote, which changes based on moisture content. This substitution achieves reliable wet banknote detection while maintaining device simplicity and ease of installation in existing ATMs.
2Measurement precision
If a complex detection system is installed to prevent wet banknote jams, then detection accuracy improves, but manufacturing and installation costs increase
Solution Approach 1:
The patent employs inexpensive electrical contact elements and basic electronic components (resistors, voltage sources, microcontroller) that are cheap to manufacture and replace. The system uses off-the-shelf components rather than specialized expensive sensors, making the apparatus easy to manufacture and install in existing ATMs without significant cost investment.
3Productivity
If the ATM accepts all deposited banknotes without verification, then processing speed is maintained, but fraudulent activities using wet banknotes cannot be prevented
Solution Approach 1:
The patent implements preliminary detection of banknote moisture content using electrical resistance measurement before the banknote enters the main processing pathway. The system measures resistance through contact elements positioned at the deposit slot, identifies wet banknotes in advance, and rejects them before they can cause jams or fraudulent transactions. This preliminary action maintains productivity by quickly rejecting problematic banknotes without disrupting the processing of valid ones.
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
Effectively prevents media item jams and fraudulent activities by accurately identifying wet media items, reducing SST servicing costs and enhancing the reliability and marketability of media item processing modules.
Implementation Method 1
at least one electrical characteristic associated with a pathway between the first and further electrical contact elements is indicative of at least one parameter of at least one media item in contact with and extending between the first and further electrical contact elements
Data Source
AI summary
The present invention provides a method and apparatus for determining at least one parameter associated with at least one media item, further comprising a first electrical contact element and a further electrical contact element supported in a spaced apart relationship via a contact support, wherein at least one electrical characteristic associated with a pathway between the first and further electrical contact elements is indicative of at least one parameter of at least one media item in contact with and extending between the first and further electrical contact elements.