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These drives are mechanical friction drives which convert the constant rotation of a plain shaft in a singledirection into two-way reciprocating motion.They operate on the principle of pivotable ball bearingbased Rolling Rings, the specially crowned running surfaces of which are pressed against a shaft. By addressing them to the shaft at an offset angle (pitch)they operate like nuts on a threaded bar, however, because oftheir ability to swivel, they have alternating left-handand right-hand pitch (providing reciprocating motion).By varying the pitch angle, the speed of travel can beset at finely stepped increments (with different speedsin the two directions of travelif required) or can be set atzero (standstill).Reversal is effected via a reversal mechanism, which isconnected to the Rolling Rings and which makescontact with adjustable endstops.
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