Dispenser for rolled sheet material
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Solution Overview
Problem
Existing bathroom tissue dispensers face issues with peripheral unwinding leading to waste, roll collapse, and jamming due to central unwinding methods, which increase maintenance frequency and costs.
Innovation Solution
A centrally unwinding dispenser design featuring internal doors with nozzles that pivotally attach to the housing, providing roll support and reducing jamming risks by allowing access without extending sheet material, thus minimizing waste and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If peripheral unwinding is used to dispense toilet tissue, then the dispenser structure is simple, but users may withdraw a large amount of tissue contributing to waste
Solution Approach 1:
The dispenser is divided into multiple functional components: a housing structure, an internal door mechanism, a nozzle assembly, and a cover system. This segmentation allows the complex centrally-unwinding function to be achieved through coordinated simple components, resolving the contradiction between waste reduction and structural simplicity
Solution Approach 2:
An internal door with a nozzle serves as an intermediary mechanism between the roll and the user. The nozzle guides the tissue through a controlled path from the center of the roll, enabling sheet-by-sheet dispensing without requiring complex mechanisms. This intermediary structure achieves waste reduction while maintaining relative simplicity
2Loss of substance
If central unwinding is used to reduce waste, then tissue waste is reduced, but the roll can lose rigidity and collapse
Solution Approach 1:
The internal door and nozzle are positioned to provide support to the roll from the inside before collapse can occur. The door structure acts as a preliminary support mechanism that maintains roll integrity during the unwinding process, preventing the rigidity loss that would otherwise lead to collapse
Solution Approach 2:
The internal door serves as a mediating structure between the roll and the external environment. It provides internal support to maintain roll rigidity while still allowing central unwinding to occur, thus preventing collapse while achieving waste reduction
3Ease of operation
If the cover is opened frequently to replace rolls in centrally unwinding dispensers, then roll replacement is enabled, but the risk for roll collapse increases
Solution Approach 1:
The internal door provides continuous support to the roll even when the cover is opened, cushioning against the destabilizing effects of frequent access. This pre-established support structure prevents collapse during the roll replacement process
Solution Approach 2:
The separation of the cover function from the internal support function (internal door) allows the cover to be opened for replacement without compromising roll stability. The internal door continues to provide support independently of cover position, enabling easy operation without increasing collapse risk
4Ease of operation
If sheet material is stretched from the center of the roll to the front of the cover, then access is enabled, but jamming occurs when the cover is closed
Solution Approach 1:
The nozzle serves as an intermediary that guides the sheet material through a controlled path from the center of the roll to the exterior. This guided path prevents the material from becoming stretched and mispositioned, eliminating jamming while maintaining ease of access
Solution Approach 2:
The nozzle pre-positiones and guides the sheet material before it exits the dispenser. This preliminary guidance ensures the material is properly aligned and tensioned, preventing jamming when the cover is closed while still allowing easy user access
Data Source
AI summary
A dispenser for sheet materials is disclosed. The dispenser includes a housing and a front cover. The dispenser includes a first internal door configured to secure a first roll of sheet material in a dispensing position and a second internal door configured to secure a second roll of sheet material in a dispensing position. The first and second doors include first and second nozzles for dispensing sheet material. The dispenser is a centrally unwinding dispenser.