Adjustable Pin Cover Sheet Feeding for Wrinkle-Free Thermoforming
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Solution Overview
Problem
Existing cover sheet supplying apparatuses for thermoforming machines face issues with sagging and non-uniform heating of cover sheets during the thermoforming process, leading to increased scrap rates, manufacturing costs, and reduced product quality due to fixed clamping systems that cannot adjust to the changing size and shape of heated cover sheets.
Innovation Solution
A cover sheet supplying apparatus with adjustable pins that can move in response to sagging or size changes of the cover sheet, ensuring a flat and uniformly heated surface, combined with a controller and sagging amount detection sensor to optimize pin positioning and heating, preventing component interference and improving apparatus stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a fixed device supporting the cover sheet at a lower part is used, then the apparatus configuration is simple, but the cover sheet lengthened by heating becomes useless and is discarded as scrap
Solution Approach 1:
The fixing pins are made adjustable in position along the lower mold, allowing them to dynamically adapt to the expanded cover sheet dimensions after heating. This dynamic adjustment capability enables the pins to maintain proper spacing and support the cover sheet uniformly, preventing waste while avoiding the need for completely reconfigurable apparatus
2Manufacturing precision
If a fixed device supporting the cover sheet is used, then the apparatus structure is simple, but the cover sheet sags downward and develops wrinkles during formation
Solution Approach 1:
The fixing pins can be adjusted to different positions along the lower mold to accommodate the sagging and expansion of the cover sheet during heating. This dynamic positioning capability allows the pins to maintain the cover sheet in a flat state, preventing wrinkles and ensuring uniform formation quality without requiring complex support structures
3Manufacturing precision
If clamps are used to stretch the cover sheet, then the edge portions can be tightened, but the entire surface cannot be uniformly stretched due to inability to adjust intervals between clamps
Solution Approach 1:
Instead of using a few large clamps that cannot adjust their spacing, the invention uses multiple small fixing pins distributed along the lower mold. Each pin can be independently adjusted to different positions, enabling fine-grained control over the stretching of the entire cover sheet surface. This segmentation approach achieves uniform stretching without requiring complex adjustment mechanisms for large clamps
4Manufacturing precision
If the fixing pins are made adjustable, then the cover sheet can be uniformly heated and stretched, but the apparatus configuration becomes more complex
Solution Approach 1:
The fixing pins are designed with adjustable positions along the lower mold, allowing them to adapt to the changing dimensions and shape of the cover sheet during heating. This dynamic adjustment capability ensures uniform heating and stretching of the cover sheet, improving molded product quality while maintaining relatively simple apparatus configuration through straightforward pin positioning mechanisms
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
The apparatus ensures uniform heating and stretching of cover sheets, reducing scrap rates and manufacturing costs, improving product quality, and enhancing the durability and efficiency of the thermoforming machine by preventing component interference and simplifying the apparatus configuration.
Implementation Method 1
when the cover sheet is heated and lengthened by the heating device, the size of the cover sheet is increased
Data Source
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AI summary
A cover sheet supplying apparatus for a thermoforming machine having an adjustable pin is proposed. Such a cover sheet supplying apparatus for a thermoforming machine having an adjustable pin according to the present invention has the technical feature in which in a process in which a cover sheet adhering to a material of a door trim is heated, fixing pins supporting a lower portion of an edge portion of the cover sheet are configured to have adjustable positions so as to be moved in response to the change of the size of the cover sheet caused by heating, so that the entire portion of the cover sheet is uniformly heated and is also uniformly stretched without wrinkling, whereby the quality of a molded product is improved, and fabric consumption is reduced.