Banknote Storage Drum Tension Control via Pivotable Drive
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Solution Overview
Problem
Conventional banknote storage units face challenges in maintaining consistent tape tension, leading to potential banknote displacement and tape warping due to dynamic changes in drum diameter and the need for complex differential motor control or additional motors.
Innovation Solution
A banknote storage unit with a single motor and a drive transmission system utilizing pivotable drive cogs and friction-based brake mechanisms to maintain tape tension, eliminating the need for mechanical interconnection and spring tensioning means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor with drive transmission is used to rotate both storage drums, then device complexity and cost are reduced, but it becomes difficult to maintain consistent tape tension due to dynamic changes in drum diameter
Solution Approach 1:
The patent employs friction-based brake mechanisms that can dynamically adjust their braking force based on the instantaneous diameter of the storage drums. As the drum diameter changes during operation, the brake mechanisms automatically modulate the friction force applied to the drive cogs, maintaining consistent tape tension without requiring complex differential motor control or multiple motors.
2Reliability
If friction-based brake mechanisms are used on drive cogs, then tape tension is maintained without additional motors, but complex differential motor control is avoided
Solution Approach 1:
The friction-based brake mechanisms are designed to automatically self-regulate based on the operational conditions. The braking force is applied through friction contact between brake pads and drive cogs, where the normal force on the brake pads is automatically adjusted according to the drum diameter changes, eliminating the need for external control systems or sensors.
3Reliability
If spring tensioning means are used inside drums, then tape tension is maintained, but tape warping may occur when spring tension is at minimum or springs fail to recoil
Solution Approach 1:
The patent replaces the spring-based mechanical tensioning system with a friction-based braking system applied externally to the drive cogs. This substitution eliminates the risks associated with spring failure, insufficient pre-tensioning, and tape warping, while providing more reliable and consistent tape tension control throughout the drum rotation cycle.
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
This solution ensures consistent tape tension and prevents tape warping, allowing for efficient banknote transfer and storage without the complexity and cost of multiple motors or spring tensioning systems.
Implementation Method 1
a first brake mechanism (13) operatively connected to a first storage device drive cog (12)... a second brake mechanism (15) operatively connected to a second storage device drive cog (14)
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A banknote storage unit comprising: a first tape reel banknote storage drum (6); a second tape reel banknote storage drum (7); and a drive transmission means (16, 17, 18) pivotable between engagement with said first tape reel banknote storage drum and engagement with said second tape reel banknote storage drum.