Stencil Printer Squeegee Alignment for Non-Flat Substrates
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Solution Overview
Problem
Existing stencil printers struggle to accurately align and print viscous substances like solder paste on substrates with non-flat surfaces, particularly those with protrusions and recesses, due to the difficulty in matching the three-dimensional shape of the stencil with the substrate's printing surface.
Innovation Solution
A stencil printer with a squeegee blade assembly that includes a movable holder and a fixed holder, adjustable in the X-direction, allowing precise alignment of the squeegee blade with the support table and stencil, using a driving member and restoring member to adjust the position of the squeegee blade relative to the substrate, and a method for aligning the squeegee blade, stencil, and substrate to ensure accurate printing on both protrusions and recesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed squeegee blade position is used, then the device structure is simple, but the alignment precision with non-flat substrates deteriorates
Solution Approach 1:
The squeegee blade holder is designed to be movable in the X direction relative to the fixed holder, transforming the static blade position into a dynamically adjustable one. This allows the blade to be precisely aligned with non-flat substrates having protrusions and recesses, resolving the contradiction between simple structure and high alignment precision.
2Manufacturing precision
If a three-dimensional stencil is used for non-flat substrates, then the printing coverage is improved, but the alignment difficulty increases
Solution Approach 1:
The movable holder allows the squeegee blade to be adjusted in the X direction to match the three-dimensional profile of the substrate. This dynamic adjustment capability makes it easier to align the blade with complex substrate geometries, reducing alignment difficulty while maintaining comprehensive printing coverage on non-flat surfaces.
Data Source
AI summary
The present disclosure provides a stencil printer for printing a viscous substance onto a substrate. The stencil printer comprises a frame, a stencil, a support table, a squeegee blade mount, a squeegee blade and a squeegee blade holder. The stencil is connected to the frame. The support table is connected to the frame and configured to support the substrate in a printing position. The support table is provided below the stencil. The squeegee blade mount is connected to the frame and provided above the stencil. The squeegee blade extends in an X direction and performing a squeegeeing operation in a Y direction perpendicular to the X direction. The squeegee blade holder comprises a fixed holder and a movable holder. The fixed holder is fixedly mounted to the squeegee blade mount, and the squeegee blade is held on the movable holder. The movable holder is configured to be movably connected to the fixed holder in the X direction to enable the squeegee blade to move relative to the support table in the X direction, so that the squeegee blade is adjustable in the X direction to a position aligned with the support table and the stencil.