Removable Paste Shield for Squeegee Drip Control in Stencil Printers
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Solution Overview
Problem
Solder paste tends to drip off squeegee blades during stencil printer operations, contaminating the workspace and leading to defective printing on electronic substrates.
Innovation Solution
A squeegee drip collection system with a paste shield that can be extended under the squeegee blades to collect excess solder paste, featuring a mechanism for easy replacement and installation, controlled by a controller to manage the movement and switching of clean and full shields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a paste shield is extended under the squeegee blade to collect dripping solder paste, then solder paste contamination is prevented, but the device complexity increases
Solution Approach 1:
The paste shield is designed as a separate, removable component that can be independently installed and removed from the stencil printer system. This segmentation allows the contamination prevention function to be added without permanently increasing the complexity of the core printing mechanism.
Solution Approach 2:
The paste shield is designed as a simple, inexpensive component that can be easily replaced when full or contaminated. This approach prevents the need for complex cleaning mechanisms or permanent maintenance systems, thereby avoiding long-term complexity increases.
2Device complexity
If the paste shield is manually removed and replaced, then the structure remains simple, but the loss of time increases due to manual intervention
Solution Approach 1:
The system incorporates a sensor that automatically detects when the paste shield is full and triggers an alert or automated response. This self-monitoring capability reduces the need for continuous manual checking and enables timely replacement without interrupting the printing workflow.
Solution Approach 2:
The sensor provides feedback about the paste shield's fill status to the control system, which can then automatically initiate replacement procedures or alert operators. This feedback loop minimizes manual intervention time by providing real-time information about when replacement is needed.
3Manufacturing precision
If the paste shield collection system is implemented, then print quality consistency is improved, but the device complexity increases
Solution Approach 1:
The paste shield acts as an intermediary component between the squeegee blade and the workspace/stencil. It intercepts and contains dripping solder paste before it can contaminate the printing area, thereby maintaining print quality without requiring modifications to the core printing mechanism.
Solution Approach 2:
The paste shield extracts and removes the harmful function (solder paste dripping) from the printing system. By isolating the contamination source in a separate collectable component, the main printing system remains simple while still achieving improved print quality consistency.
Data Source
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AI summary
A squeegee drip collection system is configured to receive assembly material from at least one squeegee blade of the print head assembly. The squeegee drip collection system includes a paste shield coupled to the print head gantry and configured to be moved between a retracted position in which the paste shield is spaced from the at least one squeegee blade and an extended position in which the paste shield is positioned under the at least one squeegee blade. The squeegee drip collection system further includes a paste shield removal assembly configured to uncouple the paste shield from the print head gantry and to remove the paste shield.