Pressure Distribution Sensing Sheet for Foreign Body Detection
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Solution Overview
Problem
Conventional foreign body sensing mechanisms in automated teller machines are inadequate in reliably detecting foreign objects, particularly thin objects or those made of non-metallic materials, leading to feeding errors and transport jams.
Innovation Solution
A paper sheet handling apparatus equipped with pressure distribution sensing sheets on movable plates that sandwich and sense the pressure distribution of inserted banknotes, allowing for accurate detection of foreign bodies by determining pressure abnormalities across a wide range, including non-metallic items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional foreign body sensing mechanisms are used, then the device complexity is low, but the measurement precision of foreign body detection is insufficient, especially for thin or non-metallic objects
Solution Approach 1:
The patent replaces conventional mechanical sensing mechanisms with a pressure distribution sensing sheet that uses piezoelectric or capacitive sensing elements to detect pressure changes. This substitution enables detection of thin and non-metallic foreign bodies through pressure distribution analysis, significantly improving measurement precision while maintaining reasonable device complexity through integrated sensing architecture.
Solution Approach 2:
The patent changes the detection parameter from binary presence/absence to pressure distribution characteristics. By measuring the spatial and magnitude distribution of pressure changes across the sensing sheet, the system can identify foreign bodies based on their unique pressure signatures, enabling precise detection of various foreign body types including thin and non-metallic objects.
2Reliability
If pressure distribution sensing sheets are added to detect foreign bodies, then foreign body detection accuracy improves, but device complexity increases
Solution Approach 1:
The pressure distribution sensing sheet serves multiple functions: detecting foreign bodies, measuring pressure distribution, and providing spatial information about object placement. This multi-functionality improves detection reliability while minimizing the increase in device complexity by consolidating multiple sensing tasks into a single integrated component.
Solution Approach 2:
The sensing sheet acts as an intermediary between the mechanical pressure applied by foreign bodies and the electronic detection system. It converts physical pressure into measurable electrical signals, enabling reliable detection of various foreign body types while maintaining a relatively simple overall system architecture through this intermediate conversion layer.
3Reliability
If conventional sensing methods are used, then the device structure is simple, but feeding errors and transport jams occur due to inadequate foreign body detection
Solution Approach 1:
The pressure distribution sensing sheet performs preliminary detection of foreign bodies before the feeding operation begins. By identifying foreign objects and their pressure characteristics in advance, the system can prevent feeding errors and transport jams before they occur, improving reliability without requiring complex real-time intervention mechanisms during feeding.
Solution Approach 2:
The sensing sheet provides continuous feedback on pressure distribution during the feeding process. This feedback enables real-time detection and response to foreign bodies, allowing the system to adjust or stop feeding operations when foreign objects are detected, thereby improving feeding reliability through closed-loop control.
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
The solution enhances the accuracy of foreign body detection, preventing feeding errors and transport jams by identifying a variety of foreign objects, regardless of their thickness or material, and allows for reliable operation of automated teller machines.
Implementation Method 1
a pressure distribution sensing sheet provided to at least one of the first or second plate and that senses a pressure distribution on the plurality of paper sheets held by the first and second plates
Data Source
AI summary
A paper sheet handling apparatus includes: a paper sheet insertion unit into which a plurality of paper sheets are inserted; a first plate provided at the paper sheet insertion unit; a second plate provided at the paper sheet insertion unit and that holds the plurality of paper sheets in a sandwiching manner with the first plate; a pressure distribution sensing sheet provided to at least one of the first or second plate and that senses a pressure distribution on the plurality of paper sheets held by the first and second plates; and a controlling unit that determines the presence/absence of a foreign body according to the pressure distribution sensed by the pressure distribution sensing sheet.