3D Printer Head Assembly with Dual Nozzle Rocker Mechanism
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Solution Overview
Problem
Existing extrusion-based 3D printing technologies face a trade-off between resolution and operating speed, requiring a printer head that offers improved flexibility without excessive weight, size, or structural complexity to achieve higher resolution and faster speeds.
Innovation Solution
A printer head assembly with a fluid-dispensing head featuring two nozzles of different sizes, controlled by a rocker mechanism that allows for easy switching between nozzle positions and actuation, enabling optimal selection of nozzles for speed and resolution based on the printing task, along with a compact and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple extrusion nozzles are provided on the printer head, then flexibility is improved, but weight and structural complexity increase
Solution Approach 1:
The printer head is designed with multiple nozzles (first and second nozzles) that can be selectively positioned into an operating position. This allows the single printer head to perform multiple functions by switching between different nozzles, improving flexibility without requiring separate printer heads for each nozzle configuration.
Solution Approach 2:
The printer head incorporates a movable mechanism that allows dynamic repositioning of nozzles between different operating positions. This dynamic capability enables the system to adapt to different printing requirements while maintaining a compact, integrated structure that avoids the weight penalty of multiple static printer heads.
2Adaptability or versatility
If multiple extrusion nozzles are provided on the printer head, then flexibility is improved, but device complexity increases
Solution Approach 1:
A single printer head structure integrates multiple nozzles and a positioning mechanism, allowing one component to serve multiple functions. This universal design improves flexibility while avoiding the need for multiple separate printer head assemblies, thereby limiting the increase in structural complexity.
Solution Approach 2:
The invention combines multiple nozzles and the positioning mechanism into a single integrated printer head assembly. By merging these components into one unit rather than using separate assemblies, the design achieves improved flexibility while keeping structural complexity manageable through consolidation.
3Volume of moving object
If a compact printer head design is used, then the size of producible objects is maximized, but nozzle switching capability is limited
Solution Approach 1:
The compact printer head incorporates a dynamic nozzle positioning mechanism that allows nozzles to be moved between operating positions within the compact structure. This dynamic capability enables nozzle switching functionality while maintaining the compact size needed to maximize the volume of producible objects.
Solution Approach 2:
The nozzle positioning mechanism utilizes spatial arrangement in multiple dimensions within the compact printer head volume. By organizing nozzles and movement paths in three-dimensional space efficiently, the design achieves nozzle switching capability without increasing the overall envelope size of the printer head.
4Speed
If a lightweight printer head is used, then rapid movement and accurate positioning are enabled, but structural complexity increases
Solution Approach 1:
The printer head is designed as a segmented structure with discrete components (nozzles, positioning mechanism, support elements) that can be optimized individually for weight. This segmentation allows the use of lightweight materials and optimized component designs while maintaining the necessary structural functions, enabling rapid movement without excessive complexity.
Solution Approach 2:
Different portions of the printer head are designed with locally optimized properties - critical structural areas use sufficient material for strength, while non-critical areas use minimal material for weight reduction. This local quality approach enables rapid acceleration and positioning while keeping overall structural complexity manageable through targeted design optimizations.
Data Source
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AI summary
A head assembly for an extrusion-based 3D printer includes : a fluid-dispensing head having a manifold and at least two fluid-dispensing nozzles, as of different sizes, which are mounted in communication with a melt chamber in a manifold. Outlets of the nozzles are each closed by a respective valve member. A rocker serves both to pivot the nozzles to their lowermost nozzle-operating position and to actuate the valve members, allowing ready switching between the valves, such that the small nozzle can be used for high resolution work, and the large nozzle for bulk infill.