Roller Assembly with Compliant Mechanisms to Reduce Component Count
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Solution Overview
Problem
Existing paper product dispensers require a large number of components, such as torsion springs and coil springs, which complicate sourcing and assembly.
Innovation Solution
A roller assembly with compliant mechanisms, including an elongated guide body, pressure roller supports, and flapper bar, formed from a single piece of material, such as plastic, that elastically deform to urge the pressure roller and flapper bar into position, eliminating the need for metallic springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pressure rollers with torsion springs and coil springs are used, then the paper dispensing function is achieved, but the number of components increases and assembly complexity increases
Solution Approach 1:
The patent combines multiple separate spring components (torsion springs and coil springs) into a single integrated compliant mechanism made from one piece of molded plastic. This merging eliminates the need for separate metallic springs while maintaining the pressure roller's dispensing function, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The patent changes the material parameter from metallic springs to molded plastic with elastic properties. The compliant mechanism is formed from plastic material that provides the necessary elasticity and spring-like behavior through its geometry and material properties rather than through separate metal spring components.
2Reliability
If traditional pressure rollers with multiple spring components are used, then the paper dispensing function is achieved, but the assembly time increases
Solution Approach 1:
By merging multiple spring components into a single integrated compliant mechanism, the patent reduces the number of assembly steps. The single-piece molded plastic structure requires no separate assembly of spring components, directly reducing assembly time while maintaining the paper dispensing function.
Solution Approach 2:
The compliant mechanism is designed as a self-contained unit where the elastic deformation of the plastic material itself provides the spring function. This self-service approach eliminates the need for separate spring components and their associated assembly operations.
3Force
If traditional pressure rollers with separate spring components are used, then the required mechanical function is achieved, but the sourcing complexity increases
Solution Approach 1:
The patent merges multiple sourced components (torsion springs, coil springs) into a single molded plastic part. This eliminates the need to source multiple different types of metallic springs from different suppliers, simplifying the sourcing process while maintaining the required pressure roller urging force through the elastic properties of the plastic compliant mechanism.
Solution Approach 2:
The patent uses plastic material with elastic properties to replace metallic spring materials. This material substitution simplifies sourcing by using a single material type (plastic) that can be molded into the complex compliant mechanism geometry, eliminating the need to source and manage multiple metallic spring components.
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 reduces the number of components, simplifying assembly and sourcing, while maintaining effective paper dispensing functionality.
Implementation Method 1
the compliant mechanisms may elastically deform to urge the pressure roller and the flapper bar in the desired direction
Data Source
AI summary
A roller assembly for a dispenser includes an elongated guide body and a pair of pressure roller supports. A plurality of compliant support arms couple the pair of pressure roller supports to the elongated guide body. A plurality of compliant support spring members are configured to couple a Rapper bar to the elongated guide body.