Banknote Transport Speed Control for Jam Prevention
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Solution Overview
Problem
Existing banknote transport systems often experience jams due to speed mismatches between the banknote validator and the transport device, leading to Z-folded banknotes in the transfer area, which can cause operational disruptions.
Innovation Solution
Implementing a method where the transport speed of the downstream device varies relative to the banknote validator, with a higher speed when accepting banknotes and a lower speed when issuing them, and using a control system to manage the conveyor belt speed differences to prevent Z-folding by ensuring the banknote is pulled under tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport device operates at a lower speed than the banknote validator, then the transport system can handle slower banknote flows, but banknotes become Z-folded and jam in the transfer area
Solution Approach 1:
The transport device employs variable speed operation with two distinct speed modes: a first speed during acceptance when the validator outputs banknotes, and a second speed during issuance when banknotes are returned. This dynamic speed adjustment ensures that the transport device never operates slower than the validator, preventing Z-folding while maintaining reliable transfer operations in both directions.
2Reliability
If the transport device operates at a higher speed than the banknote validator, then banknotes are pulled under tension and Z-folding is prevented, but the system cannot handle slower banknote flows from the validator
Solution Approach 1:
The system dynamically switches between two speed regimes based on operational mode. During acceptance, the transport device operates at a first speed that is higher than the validator's output speed, pulling banknotes under tension to prevent Z-folding. During issuance, it operates at a second speed that matches the validator's slower return speed. This dynamic adaptation resolves the contradiction by applying high speed only when necessary to prevent folding, while accommodating slower flows during issuance.
3Ease of operation
If the conveyor belt is stopped early in the winding store, then the belt becomes tension-free and banknotes can be removed without obstacles, but the transport system must coordinate complex speed variations
Solution Approach 1:
The control unit is programmed to stop the conveyor belt in the winding store before the banknote reaches the transfer point. This preliminary stopping action allows the belt to relax and become tension-free, enabling smooth banknote removal without Z-folding or obstacles. The control system automatically coordinates this timing based on the operational mode (acceptance vs. issuance), making the complexity manageable through automated timing rather than manual coordination.
Data Source
AI summary
Disclosed is a method for operating an apparatus conveying banknotes from a banknote verification and acceptance unit to a banknote storage device. Contrivances accepting banknotes are fitted with a downstream banknote placing and stacking device. The aim of the invention is to ensure that banknotes are transferred without trouble from one banknote conveying apparatus to another. Said aim is achieved by the fact that the speed at which a banknote advances in the conveying apparatus when the banknote is accepted is greater than the speed at which the banknote advances in the device that transfers the banknote to the conveying apparatus.