Screen Printing Head Counterforce Mechanism for Aperture Filling
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Solution Overview
Problem
Existing screen printing heads face challenges in achieving complete filling of printing apertures at increased printing speeds, particularly for deeper structures, due to reduced vertical force component and variability in print medium consistency, leading to incomplete deposits and reliability issues in applications like 'Pin-in-Paste' processes.
Innovation Solution
A screen printing head system with a rotatable unit in the print medium cavity, driven to counteract the horizontal force generated during head displacement, ensuring equal force application in both directions to optimize filling, combined with a pressure application unit and a feed mechanism for consistent medium supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If printing speed is increased, then productivity is improved, but manufacturing precision deteriorates due to incomplete aperture filling
Solution Approach 1:
The patent applies a counteracting force mechanism where a stationary plate or adjustable counterforce device generates a force opposite to the direction of screen printing head movement. This counterforce compensates for the horizontal component of force that prevents complete aperture filling at high speeds, effectively maintaining vertical force dominance and ensuring complete material deposition even during rapid printing operations.
Solution Approach 2:
The patent implements dynamic force balancing by making the counteracting force adjustable based on printing speed. As printing speed increases, the horizontal force component increases, and the system dynamically adjusts the counterforce magnitude to maintain optimal force balance, ensuring complete aperture filling across varying productivity levels.
2Productivity
If printing speed is increased, then productivity is improved, but reliability deteriorates due to force imbalance
Solution Approach 1:
The patent incorporates a feedback control system that monitors the force balance during printing operations. Sensors detect variations in horizontal force components generated during high-speed printing, and the control system adjusts the counteracting force in real-time to maintain stable force balance, ensuring reliable and consistent printing quality across varying speeds.
Solution Approach 2:
The patent changes the force balance parameters dynamically by adjusting the magnitude of the counteracting force based on printing speed. At higher printing speeds, the system increases the counterforce parameter to compensate for increased horizontal force components, maintaining stable and reliable force balance conditions throughout the printing process.
3Productivity
If printing speed is increased, then productivity is improved, but manufacturing precision deteriorates due to reduced contact time
Solution Approach 1:
The stationary plate or adjustable counterforce device generates a counteracting force that opposes the horizontal force component during high-speed printing. This maintains a more vertical resultant force direction, ensuring that material is pushed completely through apertures even during brief contact periods at high printing speeds.
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
This solution enables reliable and efficient filling of deeper structures and precise material deposition at higher speeds, improving the reliability of screen printing processes, especially in the electronics industry for applications like 'Pin-in-Paste' processes.
Implementation Method 1
the drive unit is operable to rotate the rotatable unit to apply a force to the print medium at the delivery aperture in the main body in a second direction which is opposite to the first direction of displacement of the screen printing head, whereby the force as applied in the second direction counteracts a force as generated by displacement of the screen printing head in the first direction
Implementation Method 2
a pressure application unit which is operative to apply a pressure to the print medium in the direction of the delivery aperture in the main body
Data Source
Figure 1~2
Figure 3~4(d)
Figure 5~6
AI summary
A screen printing head which, in a printing operation, is displaceable in a first direction over a surface of a workpiece to print deposits of a print medium on the workpiece, the screen printing head comprising: a print head assembly comprising a print unit comprising a main body including a print medium, cavity, which in use contains print medium, and a delivery aperture, which is in fluid communication with the print medium cavity and through which print medium is in use delivered from the print medium cavity to the surface of the workpiece, and a rotatable unit which is disposed in the print medium cavity of the main body and rotatable to displace print medium as contained in the print medium cavity; and a drive unit for rotating the rotatable unit such as to displace print medium as contained in the print medium cavity, wherein the drive unit is operative to rotate the rotatable unit to apply a force to the print medium at the delivery aperture in the main body in a second direction which is opposite to the first direction of displacement of the screen printing head.