Print Head Assembly with Voice Coil Mechanism for FDM
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Solution Overview
Problem
Current fused deposition modeling systems face challenges in maintaining precise registration and preventing unintentional movement of print heads during build runs, especially when print heads need to be replaced, due to their secure installation on gantry carriages.
Innovation Solution
A print head assembly with a carriage frame and receptacles that securely retain and lock print heads, using voice coil mechanisms for controlled vertical movement and suspension mechanisms to restrict movement to a single axis, allowing for precise control and easy replacement of print heads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If print heads are securely installed on gantry carriages to prevent unintentional movement, then registration precision is improved, but print head replacement becomes difficult
Solution Approach 1:
The print head assembly incorporates a movable carriage that can transition between a first position (for print head installation/removal) and a second position (for stable operation). This dynamic positioning allows the system to switch between ease of operation and manufacturing precision as needed
Solution Approach 2:
The system separates the print head assembly from the gantry carriage, allowing the print head to be independently removable while the carriage remains on the gantry. This segmentation enables easy replacement of print heads while maintaining stable carriage positioning
2Ease of operation
If print heads are easily removable for replacement, then ease of operation is improved, but registration precision deteriorates
Solution Approach 1:
The movable carriage provides a stable reference frame that remains positioned on the gantry while the print head is replaced. After replacement, the carriage can be repositioned to ensure precise registration, thus maintaining manufacturing precision despite easy replaceability
Solution Approach 2:
The movable carriage acts as an intermediary between the gantry and the print head. It provides a stable mounting platform that ensures precise registration while allowing the print head to be easily removed and replaced from this intermediate position
3Reliability
If print heads are securely locked during operation, then reliability is improved, but device complexity increases
Solution Approach 1:
The system uses a simple movable carriage design that relies on gravity and friction to maintain print head stability during operation, rather than complex locking mechanisms. The carriage can be easily moved for replacement but remains stable during printing, achieving reliability without excessive complexity
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 building of 3D parts with high-resolution features while allowing for the easy replacement of print heads, maintaining precise registration and reducing the risk of deposition errors.
Implementation Method 1
a voice coil mechanism configured to move the receptacle in directions substantially along a z-axis relative to the carriage frame
Data Source
AI summary
A print head assembly that includes a print head carriage and multiple, replaceable print heads that are configured to be removably retained in receptacles of the print head carriage. The print heads each include a cartridge assembly and a liquefier pump assembly retained by the cartridge assembly.