One-Component Backup Block for Screen Printing Height Accuracy
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Solution Overview
Problem
Conventional backup blocks in screen-printing machines have a two-component structure, making it difficult to achieve high accuracy in height precision and parallelism, leading to printing defects due to deflection and increased processing costs.
Innovation Solution
A one-component backup block with a recessed section for the air chamber, where the mounting surface and installation surface are parallel, and multiple suction holes penetrate between them, allowing for accurate vacuum suction and improved flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-component backup block structure is used, then assembly flexibility is improved, but manufacturing precision and height accuracy deteriorate
Solution Approach 1:
The patent merges the backup block body and air chamber into a single integrated component. The backup block (100) includes a recessed section (103) that forms the air chamber directly within the block structure, eliminating the need for separate base plate assembly. This integration ensures that the mounting surface (108) maintains high height accuracy and parallelism without accumulation of dimensional tolerances from multiple parts.
2Area of stationary object
If the recessed section area is increased, then vacuum suction area is improved, but structural stability deteriorates due to deflection
Solution Approach 1:
The patent applies local quality by strategically positioning reinforcement ribs (102) within the backup block structure. These ribs are located specifically in regions where deflection is most likely to occur under vacuum pressure, providing localized structural support. This allows the recessed section (103) to maintain a large area for effective vacuum suction while the reinforcement ribs prevent excessive deflection and maintain structural stability.
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 configuration enhances the accuracy of the mounting surface's height dimensions and parallelism, resulting in higher printing quality and easier changeover without the need for assembly, reducing processing costs and deflection errors.
Implementation Method 1
vacuum pumping by a vacuum pump is performed through the connecting holes
Implementation Method 2
the inside of the recessed section of the base plate is vacuum pumped, the board is vacuum sucked through the suction holes
Data Source
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AI summary
There is provided a screen-printing machine including: a mask holding device configured to hold a mask; a board holding device configured to grip a board supported from below in a horizontal direction; a positioning device configured to relatively position the board and the mask; a squeegee device configured to spread cream solder over the mask; and a control device configured to perform drive control of each device, in which the board holding device includes a lifting and lowering table capable of being positioned in an up-down direction by a lifting and lowering mechanism, and a backup block including a mounting surface on which the board is placed, an installation surface disposed parallel to the mounting surface on an opposite side thereof, multiple suction holes configured to penetrate in a thickness direction between the mounting surface and the installation surface, and a chamber recessed section formed on an installation surface side so as to surround positions of the multiple suction holes, and in which an air chamber made by the chamber recessed section is configured when the backup block overlaps an upper face of the lifting and lowering table.