Capillary Felt-Tip Pen With Air Replacement For Consistent Line Width
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Solution Overview
Problem
Conventional writing instruments, such as ballpoint pens and felt-tip pens, face limitations in adjusting line width and maintaining consistent line width throughout their use, with ballpoint pens restricted by their structure and felt-tip pens experiencing variations in line width from start to end.
Innovation Solution
A writing instrument featuring an ink storage part, an air replacement mechanism, and a central core that utilizes capillary force to adjust line width, with design specifications including an elastic limit point of 7.0 N or more, buckling strength of 7.0 N or more, and a writing flow rate per unit area of 5 g/m2 or more to ensure consistent line width and prevent damage or patchiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a ballpoint pen structure is used, then the writing instrument can change line width, but the line thickness is limited and cannot draw relatively thick lines
Solution Approach 1:
The patent replaces the mechanical ballpoint mechanism with a capillary-based ink delivery system. The central core uses capillary forces to draw ink from the storage chamber to the tip, eliminating the mechanical constraints of ballpoint pens while enabling thicker line widths through the porous structure of the central core.
Solution Approach 2:
The central core is constructed as a porous body that utilizes capillary action to transport ink. The porous structure allows the core to absorb and deliver ink through capillary forces, enabling the writing instrument to produce thicker lines compared to conventional ballpoint pens while maintaining line width adjustability.
2Shape
If a felt-tip pen structure is used, then the writing instrument can draw thick lines, but the line width varies between start and end of use
Solution Approach 1:
The patent incorporates a cushioning mechanism that provides feedback control for the central core position. As ink is consumed and the storage chamber volume changes, the cushioning mechanism adjusts the central core's position to maintain consistent capillary pressure and ink flow rate, ensuring uniform line width throughout the writing instrument's使用寿命.
Solution Approach 2:
The central core is designed to be movable rather than fixed, allowing it to dynamically adjust its position relative to the ink storage chamber. This dynamic adjustment, controlled by the cushioning mechanism, maintains optimal capillary contact between the core and ink, ensuring consistent ink delivery and line width throughout use.
3Ease of operation
If the writing part is made flexible to allow line width adjustment, then the writing comfort is improved, but the writing part may be damaged under applied force
Solution Approach 1:
The patent incorporates a cushioning mechanism that preemptively protects the central core from excessive forces. The cushioning element absorbs and distributes applied pressure, preventing damage to the flexible central core while maintaining the writing comfort provided by its flexibility. This prior cushioning allows the writing part to remain flexible for line width adjustment without compromising durability.
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 writing instrument can freely adjust line width and maintain consistent width throughout its use, preventing damage from applied forces and ensuring continuous writing with minimal abrasion loss, thus providing a stable and effective writing experience.
Implementation Method 1
an air replacement mechanism which sends ink from the ink storage part by sending air into the ink storage part
Implementation Method 2
a central core which sucks the ink sent out by the air replacement mechanism with a capillary force
Implementation Method 3
sends the sucked ink from a tip, and makes the ink adhere to a paper surface
Data Source
AI summary
A writing implement is provided which is designed to draw lines using capillary action, wherein the width of the line can be freely adjusted while the line is being drawn and it is possible to draw lines of almost the same width at the beginning of the use of the writing implement as at the end of use. A felt-tip pen 1 is provided with an ink reservoir 11, a collector 17, and a core 29 for drawing by capillary action the ink that has been dispensed by the collector 17, dispensing the drawn ink from the tip, and adhering same to a paper surface. Even in repetitive writing, the rate of variability in the width of the lines drawn at the end of use with respect to the width of lines drawn at the beginning of use is 10% or less.