Screen Printing Barrier Member Magnetic Urging Mechanism
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Solution Overview
Problem
Existing screen printing apparatuses with barrier members urged by compression springs suffer from unstable paste containment and low maintenance workability due to paste leakage and contamination, leading to inconsistent pressing forces and complex maintenance requirements.
Innovation Solution
A screen printing apparatus with barrier members on the squeegee head that utilize a magnetic urging mechanism, including a first magnetic member on the squeegee head and a second magnetic member on the barrier member, to prevent paste from escaping beyond the printing width, using a guide shaft for alignment and an attracting magnetic force for stable pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compression springs are used to urge the barrier members, then the barrier members can press against the screen mask to prevent paste escape, but the paste leaks through gaps between the barrier members and squeegee, and the spring force is lowered or varied by paste contamination
Solution Approach 1:
The patent replaces the mechanical compression spring system with a magnetic field-based urging mechanism. Magnets are embedded in the barrier members and squeegee, creating magnetic attraction forces that urge the barrier members against the screen mask without mechanical contact. This substitution eliminates paste contamination of springs, maintains consistent pressing force, and simplifies maintenance by removing complex spring mechanisms.
2Reliability
If barrier members are disposed on the squeegee to prevent paste escape, then paste containment is improved, but the system complexity increases due to additional components like compression springs and adjustment mechanisms
Solution Approach 1:
The patent simplifies the system by replacing complex mechanical urging mechanisms (compression springs, adjustment devices) with a magnetic field-based system. Magnets embedded in the barrier members and squeegee create the necessary urging force through magnetic attraction, eliminating the need for mechanical springs and their associated adjustment mechanisms, thereby reducing overall system complexity.
Solution Approach 2:
The magnetic urging mechanism provides self-regulating pressing force. The magnetic attraction automatically maintains consistent pressure between the barrier members and screen mask without requiring external adjustment mechanisms or complex control systems, allowing the system to self-maintain optimal performance.
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 stabilizes paste containment within the printing width, enhances maintenance workability by eliminating complex spring mechanisms and reducing contamination risks, ensuring consistent pressing forces and easy cleaning.
Implementation Method 1
an urging mechanism which urges the barrier member in an axial direction of the guide shaft, and wherein the urging mechanism includes: a first magnetic member including a first pole surface having a first magnetic pole and held by the squeegee head such that the first pole surface is directed toward the barrier member; and a second magnetic member including a second pole surface having a second magnetic pole opposite to the first magnetic pole and held by the barrier member such that the second pole surface is directed toward the first magnetic member, whereby the urging mechanism urges the barrier member by an attracting magnetic force acting between the first pole surface and the second pole surface
Data Source
AI summary
A screen printing apparatus includes: a barrier member which butts against a screen mask and a squeegee to prevent paste on the screen mask from escaping to an outside of a printing width of the board; and an urging mechanism which urges the barrier member toward the screen mask. The urging mechanism includes: a first magnetic member held by the squeegee head such that a first pole surface having a first magnetic pole is directed toward the barrier member; and a second magnetic member held by the barrier member such that a second pole surface having a second magnetic pole opposite to the first magnetic pole is directed toward the first magnetic member, whereby the urging mechanism urges the barrier member by an attracting magnetic force acting between the first pole surface and the second pole surface.