Polymer Feed Cylinder and Pusher for Any-Angle 3D Printheads

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Solution Overview

Problem

Existing feeding devices for polymeric materials in additive manufacturing machines are unable to reliably feed material to print heads at any angular orientation, particularly for large and complex geometry products, and are dependent on gravity.

Innovation Solution

A feeding device with a feed cylinder and a movable pusher that directly feeds polymeric material into the print head, independent of gravity, using a pneumatic system with a filter to prevent contamination and ensure continuous feeding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If gravity-dependent feeding devices (hopper and duct with auger) are used to feed polymeric material to the print head, then the device complexity is reduced, but the reliability of feeding material at any angular orientation deteriorates

Engineering Contradiction:

Improvefeeding device structureVSAvoidmaterial feeding reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent replaces the traditional gravity-dependent mechanical feeding system (hopper and auger) with a pneumatic system consisting of a feed cylinder and movable pusher. This substitution eliminates reliance on gravity, enabling reliable material feeding at any angular orientation while maintaining manageable device complexity through the use of standard pneumatic components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention introduces a pneumatic feeding mechanism where compressed air acts on a movable pusher within a feed cylinder to advance polymeric material toward the print head. This pneumatic approach provides controlled, consistent material delivery independent of gravitational effects, resolving the contradiction between simplicity and reliability.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Ease of operation

If traditional hopper and duct feeding system is used, then the ease of operation is improved, but the adaptability to different print head orientations deteriorates

Engineering Contradiction:

Improvefeeding operation simplicityVSAvoidprint head orientation adaptability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The feed cylinder and movable pusher create a dynamic feeding system that can adapt to any print head orientation. The pneumatic pusher dynamically adjusts material delivery based on the print head's angular position, maintaining ease of operation while achieving full orientational adaptability that gravity-dependent systems cannot provide.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The pneumatic feeding system serves multiple functions: it feeds material vertically, horizontally, and at any intermediate angle; it compensates for varying gravitational effects; and it maintains consistent material flow regardless of print head position. This multi-functionality achieves both operational simplicity and universal adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If auger-based gravity feeding is used, then the device complexity is minimized, but the consistency of material flow deteriorates

Engineering Contradiction:

Improvefeeding mechanism structureVSAvoidmaterial flow consistency

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The pneumatic pusher system provides consistent, controlled material advancement by using compressed air pressure to uniformly push polymeric material through the feed cylinder. This eliminates the inconsistent material flow that occurs in auger systems due to gravity variations and material bridging, achieving high manufacturing precision with manageable device complexity.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

Replacing the mechanical auger system with a pneumatic pusher eliminates the inconsistencies inherent in gravity-dependent mechanical feeding. The pneumatic system provides smooth, controlled material delivery that ensures consistent flow rates and improves manufacturing precision while keeping the overall device complexity acceptable.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 reliable feeding of polymeric material to print heads in any position, allowing the production of complex and large objects without gravity dependency, ensuring consistent material flow and preventing contamination.

Implementation Method 1

Since air is present between the polymer particles, the compression exerted by the pusher also compresses the air, which is ejected through the suction port.

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

Thanks to the filter, any dust in the feed cylinder is retained during the air ejection step and does not contaminate the print area.

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentUS12384111B2Device and method for feeding polymeric material to a printhead of an additive manufacturing machine and additive manufacturing machine

Publication Date: 2025.08.12 CARACOL SRL

AI summary

A feeding device for feeding a polymeric material to a print head of an additive manufacturing machine has a feed cylinder that flows directly into the print head at a fitting to feed the polymeric material into the print head; and a movable pusher within the feed cylinder to advance the polymeric material towards the print head.