Synchronous Selective Soldering for Continuous PCB Conveyors
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Solution Overview
Problem
Traditional multiple station selective soldering machines require workpieces to stop at each station, leading to reduced throughput capacity, increased complexity and cost, and limited workpiece length due to the need for additional components like stop pins and conveyor breaks.
Innovation Solution
A method and system for applying solder to a workpiece while it is continuously moving, using a conveyor and selective soldering nozzles that track the movement of the workpiece, allowing for synchronized application of flux, heat, and solder without stopping the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If workpieces are stopped at each station for soldering, then soldering precision can be maintained, but throughput capacity is reduced
Solution Approach 1:
The patent implements a dynamic soldering system where the nozzle moves synchronously with the workpiece on the conveyor belt. The nozzle position is continuously adjusted based on the workpiece position and soldering requirements, allowing precise soldering application while maintaining continuous conveyor motion. This dynamic coordination enables both high precision and high productivity.
Solution Approach 2:
The system maintains continuous conveyor motion throughout the soldering process, eliminating stop-start operations. The useful action of soldering is performed continuously as the nozzle selectively applies solder to required positions while the workpiece moves past, ensuring uninterrupted production flow and maximum throughput capacity.
2Ease of manufacture
If multiple components are added to stop workpieces at each station, then soldering can be performed, but device complexity increases
Solution Approach 1:
The patent removes the complex stopping mechanism (stop pins, conveyor breaks, multiple motors) traditionally required at each soldering station. Instead, it extracts only the essential function of position control, implementing a simplified system where a single conveyor continues running and a controlled nozzle performs selective soldering based on workpiece position detection.
Solution Approach 2:
The continuous conveyor system serves multiple functions simultaneously: it transports workpieces through the machine, positions them for soldering, and enables synchronous movement with the nozzle. The single conveyor replaces multiple specialized components (stop mechanisms, positioning devices, multiple motors), reducing overall system complexity while maintaining soldering capability.
3Ease of manufacture
If workpieces are stopped at each station, then soldering can be completed, but processing time is increased
Solution Approach 1:
The system eliminates idle time by maintaining continuous conveyor motion and continuous nozzle operation. The useful action of soldering is performed without interruption as the nozzle follows the workpiece movement, applying solder selectively as positions are passed. This eliminates the time loss associated with stopping and starting at each station.
Solution Approach 2:
The system detects workpiece positions in advance and prepositions the nozzle for upcoming soldering operations. By anticipating required soldering positions based on continuous position monitoring, the nozzle is ready to apply solder immediately when the correct position passes, eliminating waiting time and ensuring complete soldering without delays.
4Ease of operation
If stations are spaced apart to accommodate stopping components, then work can be performed, but machine footprint increases
Solution Approach 1:
The patent merges multiple previously separate functions (transport, positioning, soldering) into a single integrated continuous process. The conveyor and nozzle operate as a coordinated system where positioning and soldering occur simultaneously during continuous motion, eliminating the need for spaced-apart stations and reducing the overall machine footprint.
Solution Approach 2:
The system transitions from a stationary multi-station approach (requiring space for each station) to a dynamic single-station approach where the nozzle moves in synchronization with the conveyor. This dimensional change from static to dynamic operation allows compact machine design while maintaining full soldering capability.
Data Source
AI summary
Methods and apparatus for applying molten solder are disclosed. A system for applying solder to a workpiece includes a conveyor for moving a first workpiece along a machine direction, and a first selective soldering nozzle to apply solder to the first workpiece while the first workpiece is moving along the machine direction. The system can also include a flux application area to apply flux to bottoms of workpieces, a heating area to heat the bottoms of the workpieces, and a conveyor to convey the workpieces. The workpiece can constantly move through multiple areas, such as a flux application area, a heating area, and a selective soldering area. As such, two or more areas can operate on the workpiece simultaneously and while the workpiece is moving. The method includes applying solder from the first selective soldering nozzle to the first workpiece while the first workpiece is moving along the machine direction.