Paper Roll Support Geometry for Dispenser Overspin Control
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Solution Overview
Problem
Existing dispenser apparatus for paper toweling or tissue sheet materials face issues with overspin, leading to slack in the dispensed material, which can interfere with subsequent dispensing operations, and current solutions are complex and expensive.
Innovation Solution
A dispenser apparatus with centrally disposed roll support openings that include a first roll support capable of rotating the roll and exerting frictional drag forces to reduce overspin, featuring a hub projection with canted contact points to hold the roll off-center and reduce overspin, and a second roll support arm to accommodate the roll end, allowing for controlled dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional roll supports are used to allow free rotation of the roll, then the roll can rotate smoothly during dispensing, but overspin occurs causing slack in the dispensed material
Solution Approach 1:
The hub projection is positioned off-center relative to the roll support opening, creating an asymmetric weight distribution. When the roll rotates, the offset hub projection generates a counterbalancing moment that opposes the inertial overshoot, thereby reducing overspin and slack creation while maintaining smooth dispensing operation
Solution Approach 2:
The roll support structure employs asymmetric geometry with the hub projection deliberately positioned away from the center of the roll support opening. This asymmetric configuration creates a mechanical advantage that provides frictional drag during rotation to control overspin, while still allowing the roll to rotate freely during normal dispensing operations
2Object-generated harmful factors
If frictional drag forces are applied to reduce overspin, then slack creation is reduced, but the roll may experience excessive pressure or difficulty rotating
Solution Approach 1:
The hub projection applies only partial frictional drag force during roll rotation, sufficient to reduce overspin and slack creation but not so excessive as to prevent normal rotation during dispensing. The asymmetric positioning ensures the frictional force is applied selectively during the overspin phase rather than continuously
Solution Approach 2:
The frictional drag force applied by the offset hub projection is dynamic rather than static - it automatically adjusts during roll rotation based on the rotational speed and position. During normal dispensing, the friction is minimal allowing smooth rotation; during overspin events, the frictional drag increases to counteract the excessive rotation
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 reduces overspin and slack in the dispensed material, ensuring proper operation of the dispenser and accommodating various roll sizes and tolerances without excessive pressure, while maintaining the roll in place during use.
Implementation Method 1
The first roll support is configured to exert frictional drag forces on the roll to reduce overspin of the roll when the pulling force is terminated
Data Source
AI summary
Dispenser apparatus for holding a roll of paper toweling or tissue sheet material and dispensing the sheet material, the apparatus including structure exerting drag forces on the roll to reduce overspin when pulling forces on the sheet material causing dispensing have been terminated.