Floating Winding Drum for Banknote Roll Storage
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Solution Overview
Problem
Roll storage devices for sheet media, such as banknotes, are prone to slipping on the winding drum due to lateral impacts, causing issues with dispensing banknotes or releasing media from the drum.
Innovation Solution
A roll storage system with a winding drum mounted axially floating on a central drive axle, coupled via spring elements and equipped with a damping device or hysteresis clutch, absorbs shocks and prevents slipping by converting impact energy into frictional heat or generating tensile force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the winding drum is rigidly mounted on the drive axle, then the mounting is stable and secure, but lateral impacts cause the roll to slip on the winding drum
Solution Approach 1:
The winding drum is mounted in a floating manner on the drive axle, allowing it to move axially in response to lateral impacts. This dynamic mounting absorbs shock forces and prevents the roll from slipping on the drum surface, resolving the contradiction between rigid stability and impact resistance
Solution Approach 2:
A spring element is arranged on the drive axle to provide pre-compression and cushioning against lateral impacts. The spring absorbs impact energy before it can cause the roll to slip, maintaining reliable operation under lateral shock conditions
2Object-affected harmful factors
If the winding drum is mounted in a floating manner to absorb shocks, then slipping is prevented, but additional mounting complexity is introduced
Solution Approach 1:
The floating mounting allows the winding drum to move axially on the drive axle without requiring complex suspension mechanisms. The simplicity of the floating design minimizes additional complexity while effectively preventing slipping through controlled axial movement
Solution Approach 2:
The spring element provides cushioning with a simple axial arrangement on the drive axle. This straightforward spring mounting absorbs impact forces without introducing complex shock absorption mechanisms, maintaining design simplicity while preventing slips
3Object-affected harmful factors
If a damping device is added to counteract axial movement, then impact energy is dissipated, but device complexity increases
Solution Approach 1:
The spring element serves dual functions as both the floating mounting mechanism and the damping device. By pre-compressing the spring, impact energy is automatically dissipated through spring compression and friction, eliminating the need for separate complex damping mechanisms
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 solution effectively prevents slipping of banknotes during lateral impacts, ensuring reliable payout and media release by securely mounting the winding drum and reducing kinetic energy conversion from impacts.
Implementation Method 1
the winding drum is coupled to the drive axle via at least one spring element arranged on the drive axle. As a result, lateral impacts can be absorbed by the spring element
Implementation Method 2
the energy introduced by the lateral impacts is converted into frictional heat and is thus no longer available for conversion into kinetic energy
Implementation Method 3
the motor of the film drum and/or the motor of the winding drum is connected to the drive axle of the winding drum or a drive axle of the film drum via a hysteresis clutch. Such a hysteresis coupling generates a tensile force in the film
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
A roll storage system (1) for sheet-shaped media comprises at least one foil drum (6) that can be driven by a motor and has at least one band-shaped foil (5), and at least one winding drum (4) having a central drive shaft (8) that can be driven by a motor. The band-shaped foil (5) can be wound onto the winding drum (4) and the winding drum (4) is floatingly mounted on the drive shaft (8).