Marker Applicator with Transparent Detection Tube for Ink Level Monitoring
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Solution Overview
Problem
Conventional reservoir-type markers face challenges in accurately indicating the end of ink, leading to reduced long-term use and convenience, and are prone to writing failures due to dew condensation, especially with alcohol-based ink, which increases costs when trying to prevent these issues.
Innovation Solution
An applicator design featuring a hollow rear barrel with a transparent detection tube and a joint core that allows for exact visual indication of ink end and prevents dew condensation through anti-dew-condensation holes and capillary action, integrating the detection tube, joint core, and pen core for efficient ink supply and reduced air bubble entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a transparent detection tube is added to indicate ink end exactly, then measurement precision of ink end is improved, but device complexity increases
Solution Approach 1:
The detection tube is nested within the front barrel, with the joint core and pen core positioned inside the detection tube. This nested arrangement allows the detection tube to serve dual purposes: indicating ink end status and housing the ink supply components, thereby improving measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The detection tube is designed to perform multiple functions: it serves as the ink end indication window, houses the joint core and pen core, and provides structural support for the front barrel assembly. This multi-functionality resolves the contradiction by achieving precise ink end indication while avoiding the need for separate components.
2Reliability
If felt or sponge is built into the cap to suppress evaporation, then reliability of writing is improved, but dew condensation occurs inside the cap causing writing failures
Solution Approach 1:
The cap is removed from the applicator structure entirely. Instead of trying to suppress evaporation within a closed cap system (which causes dew condensation), the invention exposes the pen core to air flow while using the detection tube to monitor ink levels, eliminating the harmful dew condensation effect while maintaining writing reliability.
Solution Approach 2:
The invention converts the potential harm of evaporation (which causes dew condensation) into a beneficial monitoring mechanism. By exposing the pen core to air flow and using the transparent detection tube to visualize ink consumption, the system turns what would be a harmful evaporative process into a useful indicator of ink remaining, eliminating dew condensation while maintaining writing reliability.
3Reliability
If resin is formed with a thick wall to reduce temperature variation, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The cap structure is completely removed from the design. Without a cap enclosing the ink reservoir, there is no need for thick-walled resin construction to reduce temperature variation. The ink occlusion element is directly exposed to air flow, eliminating the thermal insulation requirement and associated manufacturing costs while maintaining reliability through alternative means.
4Productivity
If alcohol-based ink is used to improve writing performance, then productivity is improved, but dew condensation causes writing failures
Solution Approach 1:
The invention accepts the use of alcohol-based ink for improved writing performance but converts the harmful dew condensation effect into a beneficial monitoring mechanism. By exposing the pen core to air flow and using the transparent detection tube to visualize ink consumption, the system turns the evaporative nature of alcohol-based ink into a useful indicator of ink remaining, eliminating dew condensation problems while maintaining writing consistency.
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 precise ink end indication, enhances long-term use and convenience, and prevents writing failures while minimizing costs by effectively managing dew condensation and maintaining ink flow consistency.
Implementation Method 1
an essentially transparent detection tube (40) inserted in the front barrel (30)
Implementation Method 2
prevents dew condensation through anti-dew-condensation holes and capillary action
Data Source
AI summary
An applicator which includes a rear barrel 1; an ink occlusion element 10 accommodated in rear barrel 1; an ink occlusion element receiver 20 opposing the front end part of ink occlusion element 10; a see-through front barrel 30 fitted to the opening of rear barrel 1, a detection tube 40 inserted in front barrel 30 for flowing ink from ink occlusion element 10; a joint core 50 supported by detection tube 40 and flowing out ink from ink occlusion element 10; and a pen core 60 supported by detection tube 40 and disposed on the opposite side of joint core 50 with a detection space 63 from joint core 50. Detection tube 40, joint core 50 and pen core 60 are formed into an integral structure. It is possible to exactly grasp the ink end state in a visual manner, based on the presence/absence of ink in detection space 63 of detection tube 40.