All needles have a reciprocating action either en masse or serially (except on now obsolete bearded needle sinkerwheel and loopwheel frames, where the circle of fixed bearded needles merely revolves). Cams are the devices which convert the rotary machine drive into a suitable reciprocating action for the needles and other elements. The cams are carefully profiled to produce precisely-timed movement and dwell periods and are of two types, engineering cams and knitting cams. The movements may be represented in the form of a time-displacement graph.

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