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These drives are mechanical friction drives which convert the constant rotation of a plain shaft in a single
direction into two-way reciprocating motion.
They operate on the principle of pivotable ball bearing
based 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 of
their ability to swivel, they have alternating left-hand
and right-hand pitch (providing reciprocating motion).
By varying the pitch angle, the speed of travel can be
set at finely stepped increments (with different speeds
in the two directions of travelif required) or can be set at
zero (standstill).
Reversal is effected via a reversal mechanism, which is
connected to the Rolling Rings and which makes
contact with adjustable endstops.
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