Dummy proofing roll feed direction

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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...