ATM Cash Capture Detection Using Dual Infrared Sensors
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Solution Overview
Problem
Automated teller machines (ATMs) face increasing fraud through cash capture devices, which intercept and retain cash, as existing detection methods are often circumvented by new designs of these devices, leading to a need for improved detection and prevention mechanisms.
Innovation Solution
A cash capture operation defeating assembly is implemented, featuring infrared sensors mounted outside the paper currency dispense plane and in the same vertical plane as presenter belts, with control circuitry to differentiate between normal paper currency dispense and potential cash capture device insertion by analyzing detection signals from these sensors, initiating an alarm state when a cash capture device is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are mounted inside the paper currency dispense plane to detect cash capture devices, then detection capability is improved, but the sensors interfere with normal paper currency dispense operation
Solution Approach 1:
The patent positions sensors in a vertical plane different from the paper currency dispense plane, detecting objects from above or below the dispense path rather than within the dispense plane itself. This dimensional shift allows sensor placement that does not interfere with currency flow while maintaining detection capability through the vertical arrangement of sensors and presenter belts.
2Reliability
If multiple sensors are added to improve detection accuracy, then fraud detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the detection function into separate sensor components positioned at different locations (first sensor in the same vertical plane as presenter belts, second sensor outside the dispense plane). Each sensor performs a specific detection function, and the control circuitry integrates their signals to determine whether a cash capture device is present, achieving improved accuracy through modular segmentation of detection tasks.
3Reliability
If the detection system is highly sensitive to detect all potential fraud, then security is improved, but false alarms during normal operation increase
Solution Approach 1:
The patent employs feedback through the control circuitry that continuously monitors signals from both sensors and compares them against expected patterns during normal operation. The system uses the timing and presence of signals to determine whether a detected object is legitimate currency or a cash capture device, adjusting its response based on the feedback from sensor signal analysis to reduce false alarms while maintaining security.
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 detects and prevents cash capture device insertion by accurately distinguishing between legitimate currency dispense and fraudulent activities, reducing ATM fraud and enhancing security without impeding normal operations.
Implementation Method 1
The first sensor is operable for detecting a first object inserted between presenter belts of a pair of presenter belts
Implementation Method 2
a first sensor mounted outside a plane of paper currency dispense and between a currency dispenser shutter and presenter belts
Implementation Method 3
a second sensor mounted outside the plane of paper currency dispense in the presenter area and not mounted in the same vertical plane as the pair of presenter belts, the second sensor being operable for detecting paper currency as the paper currency passes in a paper currency dispense operation
Implementation Method 4
the second sensor being operable for detecting paper currency as the paper currency passes
Data Source
AI summary
A cash capture operation defeating assembly for an automated teller machine and a method for detecting insertion of a cash capture device into the automated teller machine. The assembly includes a first sensor, a second sensor, and control circuitry for receiving object detection signals from the first and second sensors. When the first sensor detects a first object: (i) if the second sensor previously detected a second object within a predetermined time period before the first object was detected, then the control circuitry determines that a normal paper currency dispense has occurred and that the first and second objects each comprise the paper currency; (ii) if the second sensor has not previously detected the second object within the predetermined time period before the first object was detected, then the control circuitry determines that the first object is potentially a cash capture device.