Thin Strand Extrusion Head for Bare Leads in 3D Printing
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Solution Overview
Problem
Existing 3D printing technologies struggle to extrude thin wires or fibers without relying on the curing, drying, or solidifying of the printing medium, limiting their placement to within the layer and restricting the extrusion of bare wire sections.
Innovation Solution
A two-part system comprising a strand extruder and a strand injector, which grips and pushes strands through a low-friction tube to a dispensing tip, allowing extrusion of thin strands without relying on medium curing or solidification, enabling bare strand leads and extrusion between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional wire feeding mechanisms are used that rely on curing, drying, or solidifying of the printing medium, then the wire can be extruded with the printing medium, but bare wire sections cannot be extruded and wire placement is restricted to within the layer
Solution Approach 1:
The system is divided into two independent subsystems: a matrix extrusion system and a strand extrusion system. The strand extruder includes separate components (drive wheel, idler bearing, tension spring, guide tube) that independently feed strands without relying on matrix curing, while the matrix extruder handles the printing medium. This segmentation allows bare strand sections to be extruded independently from the matrix material.
Solution Approach 2:
The dual-chamber extruder head can extrude both matrix material and strands simultaneously or separately through the same nozzle assembly. The system provides multi-functionality by accommodating different extrusion modes (matrix only, strand only, or combined) without requiring separate printing systems, thereby achieving versatile wire placement flexibility.
2Productivity
If a motor-driven wheel with tension spring and idler bearing is used to grip and push thin strands, then strands can be extruded without medium curing, but the device complexity increases
Solution Approach 1:
The tension spring automatically maintains constant tension on the idler bearing against the strand, eliminating the need for external tension control mechanisms. The drive wheel's rotation directly drives the strand forward through friction grip, and the guide tube's close fit against the idler bearing and drive wheel automatically prevents strand buckling without additional support structures. This self-service design achieves reliable thin strand extrusion with minimal complexity.
3Reliability
If the guide tube fits closely against the idler bearing and drive wheel, then the strand is prevented from getting caught, but the device complexity increases
Solution Approach 1:
The guide tube is positioned in a specific three-dimensional configuration where it fits closely against both the idler bearing and drive wheel simultaneously. This spatial arrangement in multiple dimensions creates a constrained pathway that prevents strand deviation and catching, ensuring reliable strand feeding through geometric constraint rather than complex mechanical controls.
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 the extrusion of thin strands (0.003″-0.01″) with or without a printing medium, facilitating bare strand sections for connections and embedding strands between layers, enhancing structural reinforcement and functional integration.
Implementation Method 1
a tensioner spring in compression between the housing and the tensioner arm; the idler bearing pressing against the wheel and strand, due to the tension spring pressing against the tensioner arm and idler bearing toward the drive wheel
Implementation Method 2
a low-friction tube to constrain the strand to the dispensing tip/nozzle
Data Source
AI summary
An apparatus for the extrusion of a solid strand into a matrix material is disclosed. The apparatus consists of two main parts including an adapter for constraining the strand until mixing with the matrix (‘strand injector’), and a motor-driven gear system that feeds the strand into the injector (‘strand extruder’). With this system, a bare strand can be extruded allowing for the creation of lead-in/lead-out sections, or for use with a matrix without an inherent curing, drying, or solidifying mechanism. Additionally, this apparatus allows for the extrusion of small (30-40 AWG) strands, enabling unique applications such as the injection of a resistive strand where smaller diameter strands are advantageous for minimized electrical or thermal overhead.