Cam operated apparatus

Cam operated apparatus comprising a cam track and cam follower means, wherein the cam track and cam follower means are engaged with one another, and the apparatus further comprises at least one head element operatively connected to one of the at least one cam track and the at least one cam follower means, and at least one rotational drive means operatively connected to the other of the at least one cam track and the at least one cam follower means, such that rotational drive causes reciprocal action of the head element along a first axis and wherein the cam track has a width measured along the first axis and the cam follower means has a width measured along the first axis and characterised in that:

• the maximum width of the cam follower means is configured to be in the region of 91% to 99%, of the minimum width of the cam track to provide the cam follower means with two degrees of motion, a first degree of motion defined by the cam track, and a second degree of motion defined by ricochet between opposing walls of the cam track, the first degree of motion causing a substantially longitudinally throw of the head element providing a pitch of the apparatus and the second degree of motion creating a harmonic effect on the head element, and the harmonic effect having a sweet spot at a value between the 91% to 99% dependent upon the pitch and the rotational drive speed.