Dummy proofing roll feed direction

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Operators at laminating machines are incorrectly loading products in the wrong direction, causing operational issues. A request for a simple solution to prevent this mistake has been made, with a preference for mechanical methods over optical sensors. Suggestions include using clear directional arrows to indicate the correct loading orientation. The goal is to create a "dummy resistant" system rather than a foolproof one. Implementing visual cues could effectively reduce errors in product loading direction.
Argyles
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So here's the the problem. We have a number of laminating machines at my work and the machine operators occasionally put the product onto the unwind chuck in the wrong direction (i.e. clockwise rather then counter clockwise). We need a SIMPLE way to insure that this does not happen. I'm aware of the use of optical sensors to accomplish this however it would be nice if there was a simpler more mechanical solution to the problem. Any thoughts...?
 
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I'm not sure about "dummy proof," but you might be able to make it "dummy resistant" with a couple of arrows showing which direction the material should face...
 

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