3D Drawing Pen Finger Detection for Stable Filament Control
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Solution Overview
Problem
Conventional 3D drawing pens suffer from shaking due to inconsistent finger pressure on mechanical actuators, require complex assembly, lack nozzle versatility, and have compromised waterproofing and design flexibility.
Innovation Solution
A 3D drawing arrangement with a finger detector-controlled filament moving system, a detachable sleeve, and a smooth outer surface, allowing for precise control without actuators, easy assembly, and enhanced waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical actuators (buttons) are provided on the outer surface of the housing for controlling the motor, then the device can be operated to feed the feed stock, but the device shakes due to inconsistent finger pressure and the actuators are prone to damage after frequent use
Solution Approach 1:
The patent replaces the mechanical button actuators with a sensor-based control system. A pressure-sensitive sensor or touch sensor is integrated into the housing surface, detecting finger pressure or touch to activate the motor. This substitution eliminates mechanical wear from frequent button pressing while maintaining ease of operation through intuitive touch control.
Solution Approach 2:
The patent introduces an intermediary sensing mechanism between the user's finger and the motor control. Instead of direct mechanical contact through buttons, the sensor acts as an intermediary that converts finger pressure into electrical signals to control the motor, reducing mechanical stress on the actuation system.
2Ease of operation
If gaps are formed between the housing and buttons to allow button movement, then the buttons can be pressed, but water may enter through the gaps and cause short circuits
Solution Approach 1:
The patent eliminates the need for mechanical button gaps by replacing buttons with a flush-mounted sensor system. The sensor is integrated into the housing surface without requiring movement gaps, maintaining waterproof integrity while enabling touch-based operation control.
Solution Approach 2:
The patent may employ a flexible or transparent film overlay on the housing surface that detects finger pressure or touch. This film allows sensor integration without creating gaps in the housing, maintaining waterproof protection while enabling actuation through the film surface.
3Stability of the object's composition
If the housing is designed as a fixed component that cannot be detached, then the internal components are securely supported, but the housing cannot be replaced with different designs or sizes
Solution Approach 1:
The patent divides the housing into separable components: a fixed internal support structure that houses the motor, gear train, and heating element, and a detachable external housing shell. The support structure remains fixed to maintain stability, while the external shell can be detached and replaced with different designs, sizes, or patterns to accommodate various user needs.
Solution Approach 2:
The patent introduces dynamic configurability to the housing system. The housing transitions from a completely fixed structure to a system with fixed functional components and replaceable aesthetic/ergonomic shells, allowing the device to adapt to different users and preferences while maintaining structural integrity.
4Device complexity
If the nozzle assembly is fixed to the housing, then the structure is simple, but the shape and size of the exit nozzle cannot be changed
Solution Approach 1:
The patent segments the nozzle assembly from the main housing, creating a detachable nozzle component. The nozzle can be removed and replaced with different configurations (different shapes, sizes, or types) while the main housing and internal components remain fixed. This allows users to switch between different nozzle types for different drawing requirements.
Solution Approach 2:
The patent makes the nozzle assembly dynamically configurable rather than permanently fixed. The nozzle connection allows for quick attachment and detachment, enabling the system to adapt to different nozzle configurations based on the drawing task requirements while maintaining a simple overall structure.
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
Enables stable drawing, easy assembly, aesthetic design, and improved waterproofing, facilitating precise control and versatile nozzle options.
Implementation Method 1
the heating element 6 is able to melt the feed stock 8 to provide a melted material
Implementation Method 2
when the finger detector 32 detects a presence of a finger of a user which is aligned with the finger detector 32
Data Source
AI summary
A 3D drawing arrangement includes a feeding passage, a heater, a filament moving system, and a controller which includes a control circuit and a finger detector electrically connected to the control circuit, wherein when the finger detector detects a presence of a finger of a user which is aligned with the finger detector, the control circuit starts operation of the filament moving system to feed a filament to the heater along the feeding passage, so that the filament is heated and melted by the heater to produce the melted material flow.