Pressure Generating Unit for 3D Printing Drop Formation

The patent employs dynamic control of the pressure generating unit to precisely regulate the timing and magnitude of pressure application. The axial movement motor dynamically adjusts the plunger position to create controlled pressure pulses that overcome wall adhesion temporarily during drop formation, then release to allow clean separation. This dynamic approach enables precise drop formation despite the harmful wall adhesion effect.

The system changes pressure parameters dynamically during the drop formation process. High pressure is applied briefly to overcome wall adhesion and form the drop, then pressure is rapidly reduced to allow clean separation. The viscosity and temperature parameters of the material are also controlled within specific ranges to optimize drop formation while minimizing wall adhesion effects.

The patent positions the axial movement motor within or adjacent to the pressure generating unit housing, nesting the motor structure within the existing device framework. This nested arrangement allows the motor to be positioned close to the discharge unit for direct pressure control while utilizing the space efficiently and minimizing overall device complexity. The motor shaft is directly coupled to the plunger through a simple transmission mechanism.

The axial movement motor serves multiple functions: it generates the primary pressure for drop formation, controls the timing of pressure application, and regulates the rate of material discharge. This multi-functionality reduces the need for additional separate components, thereby maintaining device complexity at acceptable levels while achieving precise pressure control.

The patent employs periodic pressure pulses rather than continuous high pressure. The axial movement motor applies pressure in controlled cycles - high pressure briefly during drop formation, then lower pressure during separation and positioning phases. This periodic action significantly reduces average energy consumption while maintaining effective drop formation. The temperature is also maintained at optimal levels rather than continuously high, reducing thermal energy consumption.

The system dynamically adjusts pressure and temperature parameters to match the specific requirements of each drop formation event. Pressure is elevated only when needed for drop detachment, then reduced for energy efficiency. Temperature is maintained within an optimized range that provides sufficient material fluidity without excessive energy input. These parameter changes enable effective drop formation with minimized energy consumption.