Banknote Singling via Density-Adaptive Friction Control
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Solution Overview
Problem
Existing value-document processing systems face challenges in reliably singling bank notes from a stack, often resulting in multiple drawings, faulty drawings, and jams due to variations in document density and condition.
Innovation Solution
An apparatus and method that utilize sensors to capture the size and density of the stack, controlling a transport device and transport element to influence the drawing of bank notes based on these properties, adjusting frictional forces and drawing elements to optimize the singling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If friction wheels or friction rollers are used to draw value documents from a stack, then the singling operation can be performed automatically, but multiple drawings, faulty drawings, and jams occur due to variations in stack density and document condition
Solution Approach 1:
The friction coefficient between the transport device and value documents is dynamically adjusted based on real-time sensor feedback about stack density and document condition. The control device modifies operational parameters such as friction wheel pressure or air flow strength to adapt to varying stack properties, preventing both multiple drawings and jams while maintaining automatic operation.
Solution Approach 2:
A sensor captures the density of the value document stack and provides feedback to the control device, which then adjusts the transport device parameters accordingly. This closed-loop control system continuously monitors stack conditions and modifies friction forces or air injection to maintain reliable singling under varying conditions.
2Device complexity
If the transport device applies constant frictional force to draw value documents, then the apparatus structure remains simple, but faulty drawings occur when stack density varies
Solution Approach 1:
The control device changes operational parameters of the transport device based on sensor input about stack density. When density increases, the system adjusts friction forces or air flow parameters to maintain appropriate drawing conditions, preventing faulty drawings while keeping the basic apparatus structure relatively simple.
3Ease of operation
If air suction or air injection is used to draw value documents, then handling of delicate documents is improved, but multiple drawings may occur when stack density is high
Solution Approach 1:
The sensor detects stack density and provides feedback to the control device, which adjusts air flow parameters in real-time. When stack density is high, the system increases suction or injection force to maintain reliable singling; when density is low, it reduces force to prevent multiple drawings, ensuring consistent handling across varying conditions.
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
Ensures reliable singling of bank notes by adapting to the properties of the stack, preventing jams and faulty drawings, and maintaining a simple apparatus structure.
Implementation Method 1
at least one sensor which is devised to capture a size of the stack located in the input device, in particular a height of the stack, and/or a fill level of the input device, and a density of the stack
Implementation Method 2
Individual value documents of the stack are drawn by the transport device, for example by frictional forces between the respectively lowermost value document and the transport device
Data Source
AI summary
An apparatus and a corresponding method for singling value documents includes: an input device which is devised for receiving a stack of value documents, a transport device which is devised for drawing a value document from a stack of value documents located in the input device, and a transport element, which is devised to influence the drawing of the value document from the stack of value documents. At least one sensor is provided which is devised to capture a size of the stack located in the input device, in particular a height of the stack and/or a fill level of the input device, and a density of the stack. A control device is devised to control the transport device and/or the transport element based on the captured size of the stack and/or the captured density of the stack.