Banknote Sensor Deflector for Tolerance-Resistant Validation
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Solution Overview
Problem
Conventional banknote validation devices require precise assembly and components to ensure banknotes pass without damage, but this precision is difficult to maintain and can lead to functional failures due to assembly tolerances and foreign objects.
Innovation Solution
A validation device with an elastically deformable deflector element, such as a foil made of polyester, that deflects banknotes to ensure consistent contact with a sensor, overcoming assembly precision issues and accommodating foreign objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motorised roller is positioned at the bottom of the magnetic head with a small separation distance (0.3-0.4 mm) to drag banknotes against the magnetic head, then banknote validation function is achieved, but assembly precision requirements become extremely high and the system becomes sensitive to tolerances and foreign objects
Solution Approach 1:
The patent replaces the rigid motorised roller system with a flexible magnetic head that can adapt to variations in banknote thickness and presence of foreign objects. The magnetic head itself is designed to flex or accommodate different conditions, eliminating the need for precise spacing maintenance between a roller and the magnetic head.
Solution Approach 2:
The patent removes the motorised roller component entirely from the validation mechanism. By extracting this component, the system eliminates the separation distance requirement and the associated precision assembly issues, while maintaining validation functionality through direct magnetic head contact with banknotes.
2Ease of operation
If a motorised roller is used to drag banknotes against the magnetic head, then banknote movement is achieved, but the system complexity increases and maintenance difficulty increases
Solution Approach 1:
The motorised roller is completely removed from the system. Banknote movement is achieved through alternative means (such as gravity feed or simplified transport mechanisms) that do not require the complex roller-magnetic head spacing arrangement, thereby reducing device complexity while maintaining operational capability.
Solution Approach 2:
The magnetic head is designed to automatically accommodate variations in banknote conditions (thickness, foreign objects) without requiring precise mechanical adjustment or complex control systems. The system self-adjusts to maintain functional contact, reducing overall device complexity.
3Reliability
If precise assembly is required to maintain the cavity amplitude within a specific range between the roller and magnetic head, then banknote passage without damage is achieved, but installation and maintenance become difficult
Solution Approach 1:
The magnetic head or surrounding structure incorporates flexible elements that can adapt to assembly variations and wear over time. This flexibility compensates for imprecise assembly, maintaining reliable banknote passage while allowing easier installation and maintenance without requiring micrometer-level precision.
Solution Approach 2:
The system design allows for a broader range of acceptable cavity amplitudes or separation distances compared to the rigid 0.3-0.4 mm specification. By changing the tolerance parameters, the system maintains reliability while significantly easing assembly, installation, and maintenance requirements.
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 deflector element ensures reliable and durable operation by maintaining consistent contact with banknotes, improving signal quality and reducing assembly sensitivity, while being easy to install and maintain.
Implementation Method 1
the at least one deflector element is elastically deformable and is configured to deflect the dynamics of the flexible document along the handling direction by moving it away from the bottom to bring it into feedback against the at least one sensor
Data Source
AI summary
A device for validating flexible documents is described. The device has an input portion, an output portion and an intermediate portion interposed between the input portion and the output portion, through which each of the flexible documents is moved by means of movement members along a movement direction. The device also has at least one sensor, which is positioned at the intermediate portion, and a deflector element, conformed as a laminar element, which protrudes from a bottom of the intermediate portion and is configured to deflect the dynamics of the flexible document so as to bring it against the at least one sensor.