Electronic Sheet Dispenser Antistatic Rollers Without Grounding
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Solution Overview
Problem
Conventional electronic sheet material dispensers face challenges in dissipating static electricity, particularly in battery-powered units without access to a readily accessible ground connection, which can lead to user discomfort and damage to electronic components.
Innovation Solution
Incorporating a passive, self-discharging static charge dissipating material within components prone to static charge buildup, such as the drive roller, pressure roller, and tear bar, directly formed with antistatic additives in molded polymer components, to effectively dissipate static electricity without the need for an external ground connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grounding methods are used to dissipate static charge, then static electricity can be dissipated effectively, but the dispenser requires access to an external ground connection which is not available in battery-powered units
Solution Approach 1:
The patent introduces an intermediary conductive pathway consisting of a conductive member extending from the static charge generating component to the exterior surface of the housing, and a conductive adhesive layer providing electrical connection between components. This intermediary pathway enables static charge dissipation without requiring external ground access, allowing the solution to work in battery-powered dispensers mounted on non-conductive surfaces.
Solution Approach 2:
The conductive adhesive layer serves a dual function: it provides structural attachment between components while simultaneously establishing the electrical connection pathway for static charge dissipation. This self-service approach eliminates the need for separate grounding wires or external ground connections, making the system self-sufficient and adaptable to battery-powered applications.
2Reliability
If wire connections are used to create a low impedance pathway for static charge dissipation, then static charge can be dissipated, but the device complexity increases
Solution Approach 1:
The patent merges the structural attachment function and the electrical connection function into a single conductive adhesive layer. This eliminates the need for separate wires, connectors, and grounding components that would otherwise be required to establish a low impedance pathway for static charge dissipation, thereby reducing device complexity while maintaining reliability.
Solution Approach 2:
The conductive adhesive layer performs multiple functions simultaneously: it provides mechanical bonding between the conductive member and the housing, establishes electrical continuity for static charge dissipation, and creates a low impedance pathway without requiring external ground access. This multi-functionality reduces the overall component count and simplifies the device design.
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 neutralizes static charges, preventing user shocks and protecting electronic components, while being applicable to various types of sheet material dispensers, including battery-powered units in locations without accessible grounds.
Implementation Method 1
Incorporating a passive, self-discharging static charge dissipating material within components prone to static charge buildup
Implementation Method 2
a conductive pathway (i.e., a wire) is used to connect internal components of the dispenser that are subject to static charge buildup to a mechanical contact on the back of the dispenser housing
Data Source
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AI summary
An electronic dispenser for dispensing a measured sheet from a roll of web material includes a passive, self-discharging static charge dissipating material configured with at least one component of the dispenser that stores static charge generated by operation of the dispenser.