Banknote Store Drum Diameter Control
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Solution Overview
Problem
Existing banknote storage systems face challenges in maintaining precise positioning of banknotes, managing drum diameter to prevent interference and jamming, and monitoring storage capacity and theft, often requiring complex and costly control systems.
Innovation Solution
The use of biased rotational springs and sensors to maintain constant strip tension and accurately measure drum diameters, allowing for dynamic control of banknote storage and theft detection without the need for continuous motor speed adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the drum diameter increases to store more banknotes, then the storage capacity increases, but the stability decreases and interference with other components occurs
Solution Approach 1:
The patent applies dynamics by making the drum diameter adjustable rather than fixed. The drum can dynamically change its diameter to accommodate different numbers of banknotes, optimizing storage capacity while maintaining stability. This is achieved through a mechanism that allows the drum structure to expand and contract as needed.
Solution Approach 2:
The patent changes the parameter of drum diameter from a fixed value to a variable parameter. By adjusting the drum diameter according to the number of banknotes stored, the system can maximize storage capacity without compromising stability or causing interference with other components.
2Measurement precision
If the rotational speed of drums is continuously adjusted to maintain constant strip tension, then the strip positioning accuracy improves, but the device complexity and cost increase
Solution Approach 1:
The patent replaces the complex mechanical control system with a simpler solution. Instead of continuously adjusting rotational speeds through complex motor control, the system uses a relationship between drum diameters and rotational speeds that naturally maintains constant strip tension. This substitution reduces device complexity while preserving positioning accuracy.
Solution Approach 2:
The system performs self-service by automatically maintaining constant strip tension through the inherent relationship between drum diameters and rotational speeds. The control system calculates and adjusts speeds based on measured diameters, eliminating the need for complex external control mechanisms and reducing overall system complexity.
3Length of moving object
If the number of windings on one drum decreases, then the strip length unwound decreases, but maintaining constant tension requires speed adjustments
Solution Approach 1:
The patent implements feedback by measuring the diameter of drums and using this information to calculate and adjust rotational speeds. Sensors continuously monitor drum diameters, and the control system uses this feedback to maintain constant strip tension, automatically compensating for changes in strip length as windings decrease or increase.
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 proper banknote positioning, prevents jamming by managing drum diameter, and allows for theft detection and capacity estimation, all while reducing system complexity and cost.
Implementation Method 1
The strip is held firmly between the two drums at all times
Implementation Method 2
determination of the radius of a spool on a driven reel
Data Source
AI summary
A method of controlling a banknote store comprising at least one winding means and at least one elongate support means which can be wound and/or unwound from the winding means for storing and/or transporting a banknote, comprises determining the radius or diameter of a spool comprising at least the winding means using the degree of rotation of the winding means and the corresponding linear amount of movement of the elongate support means.