Writing Tip Assembly with Double-Ball Ink Flow Control
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Solution Overview
Problem
Conventional writing instruments with high-viscosity ink face leakage issues at extreme environmental conditions, while those with low-viscosity ink suffer from blow-out phenomena and inconsistent ink flow.
Innovation Solution
A writing tip assembly featuring a micro-spring and a double-ball system, where a second ball transfers ink to a writing ball, controlled by a micro-spring, which acts as an ink-guiding member, and a lamella regulates pressure to prevent leakage and ensure uniform ink flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-viscosity ink is used, then leakage is prevented, but ink flow control is poor and writing performance deteriorates
Solution Approach 1:
The patent changes the viscosity parameter of the ink to an optimal range (10-100 mPa-s) that balances leakage prevention and flow control. This parameter optimization allows the ink to maintain sufficient thickness to prevent leakage while remaining fluid enough for controlled flow through the feeder system, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent introduces a feeder system as an intermediary component between the ink reservoir and the tip. This feeder acts as a mediator that controls ink flow by regulating the interaction between the ink and the tip, enabling precise control over ink discharge while maintaining leakage prevention through the optimized viscosity formulation.
2Productivity
If low-viscosity ink is used, then ink flow is improved, but blow-out phenomenon occurs and leakage increases
Solution Approach 1:
The patent optimizes the viscosity parameter to a specific range (10-100 mPa-s) that prevents the blow-out phenomenon. This parameter change ensures the ink remains sufficiently viscous to maintain capillary action and controlled flow, while still being fluid enough for smooth writing, thereby eliminating harmful blow-out effects while maintaining good ink flow.
Solution Approach 2:
The patent employs a disposable feeder system that is replaced periodically. This feeder acts as a consumable component that maintains optimal ink flow characteristics over time, preventing blow-out phenomena through its controlled capillary structure while ensuring consistent writing performance throughout its service life.
3Device complexity
If conventional spring is used, then structure is simple, but ink transfer control is insufficient and leakage occurs at extreme conditions
Solution Approach 1:
The patent segments the spring structure into multiple functional zones with different coil diameters. The spring is divided into a first portion with a first coil diameter and a second portion with a second coil diameter, allowing each segment to perform specialized functions - one for structural support and the other for ink transfer control, thereby improving reliability while maintaining reasonable structural complexity.
Solution Approach 2:
The patent designs the spring to serve multiple functions simultaneously: it provides structural support, controls ink transfer, and prevents leakage at extreme conditions. This multi-functional spring integrates the roles of mechanical support and fluid control into a single component, improving reliability without proportionally increasing device complexity.
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 system provides controlled ink dispensing with reduced leakage and smooth writing performance across various environmental conditions, maintaining consistent ink flow and preventing feathering, skip writing, and other issues.
Implementation Method 1
a micro-spring, a writing ball configured to transfer ink to a substrate, and a second ball between the writing ball and the micro-spring. The second ball is configured to transfer ink to the writing ball
Implementation Method 2
a lamella regulates pressure to prevent leakage and ensure uniform ink flow
Implementation Method 3
a writing ball configured to transfer ink to a substrate
Data Source
AI summary
A writing tip assembly for dispensing a free-flowing low-viscosity ink from a writing instrument may include a micro-spring, a writing ball configured to transfer ink to a substrate, and a second ball between the writing ball and the micro-spring. The second ball is configured to transfer ink to the writing ball. A writing instrument for dispensing a free-flowing low-viscosity ink includes an ink reservoir, the writing tip assembly, and a feeder fluidically coupling the ink reservoir to the writing tip assembly.