Roller Ball Pen Feed Rod Submersion for Metallic Ink
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Solution Overview
Problem
Traditional ink-delivery systems for metallic inks face issues with the settling of metallic particles, leading to clogging and inefficient ink transport due to the use of highly-porous nibs that contact only a small portion of the reservoir.
Innovation Solution
A roller-ball pen design with a housing, reservoir, and feed rod that increases the surface area for ink transfer by submerging the feed rod into the reservoir, ensuring continuous ink flow and preventing clogging, using a roller ball tip to dispense metallic ink effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a highly-porous nib is used for ink delivery, then ink absorption capability is improved, but metallic particle settling and clogging occur
Solution Approach 1:
The patent employs a highly-porous nib structure to maximize ink absorption and retention capabilities. The porous material allows the nib to hold sufficient metallic ink supply while the controlled porosity prevents complete particle settling by maintaining ink saturation throughout the nib structure.
Solution Approach 2:
The patent transitions from traditional tip-only contact to extended surface contact by submerging a significant portion of the nib into the ink reservoir. This dimensional extension creates multiple ink uptake zones along the nib length, ensuring continuous ink supply and preventing clogging through distributed ink delivery points.
2Productivity
If a small contact area between nib and reservoir is used, then device simplicity is maintained, but ink transport efficiency decreases
Solution Approach 1:
The patent extends the nib structure vertically into the ink reservoir, transforming a point-contact configuration into a distributed contact system. This dimensional change increases the effective ink uptake area without adding separate components, maintaining structural simplicity while dramatically improving ink transport efficiency.
Solution Approach 2:
The extended nib structure serves multiple functions simultaneously: it acts as both the writing tip and the ink uptake mechanism. By making the nib itself the primary ink transport interface, the design eliminates the need for separate feed systems or complex pumping mechanisms.
3Reliability
If traditional nib structure is used, then manufacturing simplicity is maintained, but particle settling and clogging occur
Solution Approach 1:
The patent extracts the roller ball mechanism from the tip and positions it within the housing, separating the ink delivery function from the writing function. This extraction allows the nib to focus solely on ink supply while the roller ball handles controlled ink transfer to the writing surface, preventing clogging through mechanical ink agitation.
Solution Approach 2:
The roller ball acts as an intermediary between the ink reservoir and the writing surface. It receives ink from the extended nib, agitates the metallic particle suspension through rotation, and delivers controlled ink amounts to the writing surface, ensuring continuous flow without clogging.
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 enables efficient and continuous transfer of metallic ink over long distances, preventing particle settling and maintaining ink flow despite clogging, ensuring reliable marking performance.
Implementation Method 1
a feed rod that increases the surface area for ink transfer by submerging the feed rod into the reservoir
Implementation Method 2
using a roller ball tip to dispense metallic ink effectively
Data Source
AI summary
A roller ball pen for use with metallic inks, and a method for assembling the roller ball pen for use with metallic inks, is described herein. The pen body includes a housing that encloses a reservoir, a collet, a feed rod, and a tip. The feed rod transfers ink from the reservoir to a roller ball tip at a tapered end of the pen housing. In embodiments, the feed rod is embedded at a threshold distance inside the reservoir to provide an increased surface area for transfer of a metallic ink suspension. In further embodiments, a method of assembling the roller ball pen includes saturation of the reservoir with a metallic ink based on inserting a particular injection needle at a particular depth inside the reservoir.