Stencil Planarity Alignment With Rotatable Clamp Control
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Solution Overview
Problem
Industrial screen-printing machines lack the ability to automatically correct for planar alignment errors outside the initial machine build stage or during subsequent manual calibrations, limiting their capability to achieve multi-planar alignment with three degrees of freedom.
Innovation Solution
A planarity control mechanism that allows the stencil support to be selectively rotated about the X and Y axes, combined with a clamp assembly that permits rotation and translation during alignment and clamps the stencil support to prevent movement along the X, Y, and Z-axes when aligned, enabling precise multi-planar alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional alignment systems with fixed actuators are used, then the machine structure remains simple and stable, but the ability to correct planar alignment errors is lost after initial calibration
Solution Approach 1:
The stencil support is transformed from a static structure to a dynamic one capable of rotation about X and Y axes. This is achieved by replacing fixed actuators with a planarity control mechanism that includes rotatable actuators, allowing the stencil support to adjust its orientation and correct planar alignment errors dynamically
Solution Approach 2:
The alignment system transitions from two-degree-of-freedom alignment (X-Y plane only) to three-degree-of-freedom alignment by adding rotational capability about X and Y axes. This dimensional expansion enables correction of planar alignment errors in addition to positional alignment
2Manufacturing precision
If the stencil support is made movable for alignment adjustment, then alignment precision is improved, but stability during printing may be compromised
Solution Approach 1:
The clamp assembly transitions from a static clamping structure to a dynamic one that can rotate along with the stencil support during alignment. This is achieved by mounting clamps on rotatable actuators rather than fixed structures, allowing the clamping force to move with the stencil support while maintaining stable contact
Solution Approach 2:
Rotatable actuators serve as intermediaries between the fixed machine structure and the movable stencil support. These actuators transmit both the alignment movements and the clamping forces, enabling the clamps to follow the stencil support's motion while maintaining stable contact
3Stability of the object's composition
If fixed clamps are used to secure the stencil support, then stability during printing is maintained, but the ability to perform alignment adjustments is restricted
Solution Approach 1:
The clamp assembly is transformed from a fixed structure to a dynamic one capable of rotation. This is achieved by mounting clamps on actuators that can rotate, allowing the clamps to move with the stencil support during alignment adjustments while maintaining stable contact during printing
Solution Approach 2:
The clamp assembly is designed to perform multiple functions: it provides stable clamping during printing and simultaneously allows for alignment adjustments during the setup phase. This is achieved through the rotatable actuator mechanism that enables both modes of operation
Data Source
AI summary
An alignment system for a workpiece printing machine comprises a stencil support and a workpiece support, and a planarity control mechanism having at least two actuators arranged to effect relative rotation of the stencil support and workpiece support about both the horizontal axes.