I do, IBM ones, although I think the ones I saw had a line of holes in the tape column and sensed the tape loop position by looking at which (or perhaps how many) holes saw vacuum. The real advantage of this 'dancer' system is its effectively zero weight.
Paul M wrote in news: snipped-for-privacy@4ax.com:
Actually there can be considerable stretch, even intermittent growth or shrink due to heat/cool cylcing as the material gets printed, dried and printed again going through the press. Even in the paper industry, there many printers, etc that run plastic as well as paper, on the same machines and many plastics stretch like heck. You can't have a loose web while printing, it will walk all over the place. You can't re-roll a loose web either....well....not on a 3000 lb roll anyway. It's done with a dancer and servo system. Check out the Bobst Registron systems.
-- Anthony You can\'t \'idiot proof\' anything....every time you try, they just make better idiots. Remove sp to reply via email
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