Stencil Printer Lift Tool Assembly Decoupling
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Solution Overview
Problem
Current stencil printing systems face challenges in efficiently supporting and clamping substrates during printing operations, particularly in achieving precise positioning and minimizing cycle time while maintaining quality, due to limitations in existing lift tool assemblies and conveyor systems.
Innovation Solution
The implementation of a lift tool assembly with a modular clamping subassembly and a conveyor system that includes a pair of rail members with lift tool assemblies, capable of engaging and supporting substrates at multiple heights, utilizing permanent magnets and pneumatic cylinders for precise clamping and movement, decoupling from transport rail members for improved precision and repeatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional lift tool assembly is used to support substrates during printing operations, then the substrate can be held in position, but the positioning precision and repeatability are insufficient for printing features with smaller dimensions and finer pitch
Solution Approach 1:
The lift tool assembly is segmented into multiple independent height-adjustable support points (feet) that can be individually positioned. Each foot can be independently adjusted in height to precisely match the substrate thickness, enabling accurate substrate positioning and flatness without requiring a completely complex rigid structure.
2Manufacturing precision
If the lift tool assembly remains coupled to transport rail members throughout the operation, then the structure is simpler, but the positioning precision and repeatability deteriorate due to transport vibrations and movements
Solution Approach 1:
The lift tool assembly is pre-positioned and decoupled from the transport rail members before the printing operation begins. This preliminary decoupling action isolates the positioning system from transport vibrations and movements, ensuring positioning repeatability without requiring additional time during the actual printing cycle.
Solution Approach 2:
The lift tool assembly transitions from a coupled state during transport to a decoupled state during printing operations. This dynamic reconfiguration allows the system to optimize for different operational phases: simplicity during transport and precision during printing, without permanently increasing device complexity.
3Manufacturing precision
If the lift tool assembly is designed for high precision positioning, then substrate positioning improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The feet of the lift tool assembly are designed to be manually adjustable by the operator to match substrate thickness. This self-adjusting mechanism eliminates the need for complex motorized positioning systems or precision-machined fixed supports, achieving high positioning precision through simple, easily manufactured components that serve themselves through operator input.
4Adaptability or versatility
If the conveyor system uses a fixed height design, then the structure is simpler, but it cannot accommodate substrates of varying thicknesses or enable precise positioning for different printing requirements
Solution Approach 1:
The conveyor system maintains a simple fixed-height overall structure, but incorporates localized height-adjustable feet at specific support points. This local adjustment capability allows the system to accommodate substrates of varying thicknesses and achieve precise positioning without requiring the entire conveyor system to be complex and adjustable throughout.
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 precise and repeatable positioning of substrates, reduces cycle time, and enhances the ability to print features with smaller dimensions and finer pitch, while minimizing waste and allowing for customization and modular design options.
Implementation Method 1
The foot of the lifter portion may contain permanent magnets to couple to the support of the lift table assembly
Data Source
AI summary
A conveyor system for a stencil printer includes a pair of rail members, with the pair of rail members extending through a frame and configured to transport the substrate through the stencil printer. The conveyor system further includes, for each rail member, a lift tool assembly coupled to the rail member. The lift tool assembly includes a lifter portion, a main plate secured to the lifter portion, and a clamping member coupled to the main plate. The clamping member is configured to move horizontally between a substrate engaged position and a substrate disengaged position. The lift tool assembly further includes a thin foil coupled to the main plate. The thin foil is configured to move vertically and horizontally, independent from the clamping member.