Sheet Dispenser Resistance Mechanism for Consistent Pull Force
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Solution Overview
Problem
Conventional sheet product dispensers either provide insufficient resistance, leading to excessive rotation and waste, or inconsistent resistance that varies over the life of the roll, resulting in an undesirable user experience and increased costs due to unnecessary sheet product usage.
Innovation Solution
A sheet product dispenser with a roll support mechanism and a resistance mechanism that provides a consistent pull force resistance between 36 grams-force and 96 grams-force throughout the majority of the roll's life, ensuring controlled unwinding and reducing waste by maintaining a constant user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional dispensers provide insignificant resistance, then the roll can rotate freely and unwind sheet product easily, but the roll continues to rotate beyond necessary point due to inertia causing over-dispensing and waste
Solution Approach 1:
The dispenser applies preliminary resistance force to the roll during rotation to counteract the inertia-driven over-rotation. The resistance mechanism engages the roll and provides continuous opposing force throughout the dispensing operation, preventing the roll from coasting beyond the intended dispensing point and thereby reducing sheet product waste.
2Loss of substance
If conventional dispensers provide significant resistance, then free-wheeling and over-rotation are reduced, but the resistance varies significantly as the roll rotates and over its life, causing inconsistent user experience
Solution Approach 1:
The resistance mechanism is designed with dynamic elements including a cam follower that tracks a cam profile, allowing the resistance force to adapt throughout the roll's rotation and dispensing life. This dynamic adjustment maintains substantially constant resistance despite changes in roll diameter and position, providing consistent user experience while preventing waste.
Solution Approach 2:
The cam profile is specifically designed to modulate the resistance force parameters throughout the dispensing cycle. By varying the cam geometry, the system maintains optimal resistance levels that compensate for roll diameter reduction and rotational position changes, ensuring consistent operational characteristics.
3Reliability
If conventional dispensers provide intermittent and varying resistance, then some control over rotation is achieved, but the resistance varies significantly over the roll's life causing inconsistent user feel and perception
Solution Approach 1:
The resistance mechanism incorporates dynamic adjustment through cam-follower geometry that automatically adapts the resistance force throughout the roll's dispensing life. This ensures substantially constant resistance force is applied to the roll regardless of its rotational position or remaining diameter, providing consistent user feel and perception.
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 dispenser effectively reduces sheet product usage by up to 30% and provides a consistent user experience by maintaining a stable resistance level, thereby decreasing overall costs and minimizing waste.
Implementation Method 1
providing, via the sheet product dispenser, a pull force resistance opposing the rotation of the roll of sheet product
Data Source
AI summary
A resistance mechanism for a sheet product dispenser for dispensing a length of sheet product from a roll of sheet product rotatably supported by the sheet product dispenser is provided. The resistance mechanism includes an arm configured to frictionally engage a surface of the roll of sheet product, and a spring attached to the arm and configured to bias the arm into engagement with the surface of the roll of sheet product, such that the resistance mechanism provides a pull force resistance opposing a pull force applied to a tail portion of the roll of sheet product.