Free wheels: intermittent feed
When used for intermittent feed applications, the intermittent feed will be performed by the external component, whilst transmission will be performed by the inner race. One freewheel is already a complete intermittent feed unit but, in this case, only an interrupted rotating movement from the transmission is possible, during which the feed periods are exactly the same as the stationary periods (idling during the return movement). By using two or more freewheels with alternating operation (i.e. by means of cams), a continuous rotation transmission movement will be achieved, although slightly uneven.