Nested Cap Mechanism for Ink Drying Prevention in Drawing Devices
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Solution Overview
Problem
Conventional drawing devices face challenges in maintaining the usability of pen tips due to ink drying, especially when small motors are used to minimize device size, resulting in a poor seal and limited anti-drying effect.
Innovation Solution
A cap mechanism comprising an inner and outer cap with an elastic member that applies a reaction force to secure the pen tip, enhancing the seal and preventing drying through a locking mechanism that applies a pressing force greater than the elastic member's force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small motor is used to minimize device size, then the overall device size is reduced, but the pressing force applied to the cap is insufficient resulting in poor seal and limited anti-drying effect
Solution Approach 1:
The patent employs a nested cap structure where an inner cap is placed inside an outer cap. The inner cap provides the primary sealing function against the pen tip, while the outer cap provides additional sealing and structural support. This nested arrangement allows the system to achieve sufficient sealing force without requiring a large motor, as the caps work together to create multiple sealing interfaces that distribute and amplify the pressing force.
Solution Approach 2:
The cap is divided into separate functional components: an inner cap with a sealing portion that directly contacts the pen tip, and an outer cap that provides additional sealing and structural support. This segmentation allows each component to perform its specific function efficiently, with the inner cap focusing on sealing and the outer cap providing reinforcement, thereby achieving effective sealing without requiring excessive pressing force from the motor.
2Ease of operation
If the pen tip is simply placed on the cap without locking mechanism, then the device operation is simple, but the seal strength is poor and anti-drying effect is limited
Solution Approach 1:
The locking mechanism is designed to be automatically engaged when the cap is placed on the pen. The elastic member automatically pushes the locking protrusion into the locking groove without requiring additional user action or complex mechanisms. This self-service approach maintains ease of operation while ensuring reliable sealing through the automatic engagement of the locking structure.
Solution Approach 2:
The elastic member acts as an intermediary between the cap and the pen, providing the necessary pressing force to ensure proper sealing. When the cap is placed on the pen, the elastic member automatically compresses and pushes the locking protrusion into the locking groove, mediating the interaction between the cap and pen to achieve both easy operation and reliable sealing.
3Device complexity
If conventional single cap structure is used, then the device structure is simple, but the anti-drying effect is insufficient for extended period usability
Solution Approach 1:
The nested cap structure with inner and outer caps creates multiple sealing interfaces that work together to prevent ink drying. The inner cap provides the primary seal against the pen tip, while the outer cap provides an additional sealing layer. This multi-layer nested structure significantly extends the anti-drying duration compared to a single cap structure, while the nesting arrangement keeps the overall structure compact and manageable.
Solution Approach 2:
The patent transitions from a single-dimensional sealing approach to a multi-dimensional sealing system by adding both inner and outer caps with different sealing functions. The inner cap seals at one dimension (direct contact with pen tip), while the outer cap seals at another dimension (external sealing), creating a multi-dimensional sealing barrier that extends anti-drying protection over longer periods.
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 cap mechanism effectively prevents pen tip drying for an extended period while maintaining a compact device size, ensuring reliable performance in drawing applications.
Implementation Method 1
an elastic member arranged between the outer cap and the inner cap, which applies reaction force to the inner cap towards the opening in the outer cap when another force is added to the inner cap
Data Source
AI summary
A drawing device includes a pen that applies a liquid material to a drawing surface and a cap that covers a tip side of the pen and is arranged at a standby position of the pen. The cap includes: an inner cap that has an opening and covers the tip side of the pen when a periphery of the opening is brought into contact with the outer peripheral surface of the tip side of the pen; an outer cap that has an opening, is arranged outside of the inner cap, and covers the tip side of the pen that is covered by the inner cap when the pen is locked into the outer cap; and an elastic member that is arranged between the outer cap and the inner cap and energizes the inner cap towards an opening side of the outer cap. The pen and the outer cap each have an interlockable locking mechanism.