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When rotated as indicated in the top illustration, the rollers and metal strip will move to the right.
A mechanism consisting of two or more hard cylindrical rollers with a flexible nonstretching band looped around them, so that the rollers move against each other with very little friction.
[rol(l) + -amite, of unknown origin.]
(Mechanical Engineering) engineering a frictionless bearing device using two rollers and a moving flexible band
a nearly frictionless device used as a bearing, consisting of a flexible band looped around two or more rollers.