Dual-Source Tooling Vacuum for Non-Flat PCB Printing
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Solution Overview
Problem
Existing industrial printing machines lack flexibility in applying vacuum to tooling, with most using a single vacuum source that may not optimize for specific applications, particularly when dealing with non-flat workpieces or components that require precise alignment and support during printing operations.
Innovation Solution
A tooling vacuum unit that can be retrofitted or integrated into a printing machine, allowing selective use of multiple vacuum sources (venturi-pump for high vacuum and low flow, and turbine-pump for low vacuum and high flow) to optimize vacuum application based on the specific needs of the printing operation, and includes a suction nozzle for precise component alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single vacuum source is used in existing printing machines, then the device complexity is reduced, but the adaptability to different workpiece types and printing requirements deteriorates
Solution Approach 1:
The vacuum system is segmented into multiple independent vacuum sources (first vacuum source for high vacuum/low flow, second vacuum source for low vacuum/high flow) that can be selectively activated. Each vacuum source connects to the tooling table through separate vacuum ports, allowing independent control of vacuum levels for different workpiece types and printing requirements.
Solution Approach 2:
The system dynamically adapts vacuum levels by selectively activating different vacuum sources based on the specific printing task. The control system can switch between high vacuum mode (for delicate components requiring strong holding force) and low vacuum mode (for larger workpieces requiring higher airflow), providing dynamic adaptability without permanent structural changes.
2Reliability
If high vacuum is applied to clamp workpieces, then the workpiece holding stability is improved, but the risk of damaging delicate components on non-flat workpieces increases
Solution Approach 1:
The system applies different vacuum levels to different regions or situations by selecting appropriate vacuum sources. High vacuum is applied only when necessary for delicate components requiring strong holding force, while low vacuum is used for larger or less delicate workpieces, creating localized quality in vacuum application that prevents unnecessary component damage.
Solution Approach 2:
The system changes the vacuum parameter (pressure level) based on workpiece characteristics and printing requirements. By having access to both high vacuum and low vacuum modes, the system can adjust the vacuum parameter to match the specific needs of each workpiece, maintaining holding stability while minimizing damage risk through parameter optimization.
3Manufacturing precision
If a single vacuum source is used, then the ease of operation is maintained, but the printing quality for specific applications deteriorates
Solution Approach 1:
The system performs self-service by automatically selecting the appropriate vacuum source based on the specific printing application. The control system monitors workpiece type and printing requirements, then autonomously activates the suitable vacuum mode (high vacuum or low vacuum) without requiring manual intervention, thereby maintaining ease of operation while improving printing quality through optimized vacuum selection.
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
Enhances printing quality by providing flexible vacuum control, ensuring proper alignment and support of non-flat workpieces, reducing the risk of component damage, and improving contact between the printing screen and workpiece during operations.
Implementation Method 1
a first vacuum source for applying at least a partial vacuum to the assembly volume in use
Implementation Method 2
a second vacuum source for applying at least a partial vacuum to the interior of the chamber in use
Implementation Method 3
A suction nozzle for applying at least a partial vacuum to the underside of a component to exert a downward force to the component
Data Source
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AI summary
A tooling vacuum unit for a circuit board assembly machine, such as a printing machine, which enables two different vacuum sources to be connected to tooling. The tooling vacuum unit may be a retrofittable unit configured to sit on top of a standard tooling table in the machine, or an integrated part of the machine, and provides a tooling support surface for a workpiece being machined. Also described are suction nozzles for securing a printing screen relative to the workpiece.