Rolled Sheet Dispenser Feed Roller for Quiet Consistent Perforation
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Solution Overview
Problem
Existing dispensers for flexible sheet materials often cause bunching, ripping, or inconsistent cutting, and generate noise, while also failing to reset properly due to insufficient user force, particularly when handling different grades of paper.
Innovation Solution
A dispenser with a feed roller assembly and cutting mechanism that includes a biasing assembly, pressing rollers, and a cam follower system to ensure consistent cutting or perforation without tearing, noise reduction, and automatic resetting through a combination of manual or motor-driven operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical cutting mechanisms with blades are used to cut paper, then cutting function is provided, but bunching, ripping, or inconsistent cutting occurs particularly with different grades of paper
Solution Approach 1:
The patent replaces traditional blade-based mechanical cutting mechanisms with a perforation mechanism that creates tear lines in the paper. This substitution eliminates the problems of bunching and ripping associated with blades while maintaining the cutting function through a different physical mechanism (perforation rather than slicing).
Solution Approach 2:
The invention changes the cutting parameter from blade contact force to perforation hole pattern. By creating a series of holes along a tear line rather than using a continuous blade cut, the system achieves consistent cutting across different paper grades without the mechanical stress that causes bunching and ripping.
2Ease of manufacture
If mechanical cutting mechanisms operate to dispense paper, then cutting is achieved, but significant noise is generated which is undesirable in hospitals, offices, or other environments
Solution Approach 1:
The patent replaces high-noise blade cutting mechanisms with a low-noise perforation system. The perforation mechanism operates quietly by creating holes through friction and pressure rather than through high-velocity blade contact, significantly reducing acoustic emissions in sensitive environments.
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 provides reliable cutting or perforation of sheet materials without bunching or tearing, reduces noise during operation, and facilitates easy resetting of the cutting mechanism, addressing the issues of inconsistent cutting and noise in existing dispensers.
Implementation Method 1
The feed roller can include a biasing assembly with one or more biasing members coupled thereto (e.g., springs or other suitable biasing mechanism) that assist in rotation of the feed roller
Implementation Method 2
The pressing rollers also can be biased toward the body of the feed roller sufficient to engage the sheet material between the one or more pressing rollers and the feed roller so that the sheet material is pulled therebetween
Data Source
AI summary
In one aspect, the present disclosure is directed to a sheet material dispenser that includes a feed roller that is rotatable to facilitate dispensing of the sheet material from a discharge in a housing of the dispenser. The dispenser can have a cutting assembly that includes a cutting blade and at least one movable support coupled to cutting blade and that is actuated with rotation of the feed roller to cause movement of the cutting blade to at least partially cut, score, or perforate the sheet material during dispensing thereof. The dispenser also can have a biasing assembly coupled to the feed roller body to assist rotation of the feed roller body and/or movement of the cutting blade. Other aspects also are described.