The transmission function psi (phi) and its derivation psi' are given,
and the cam profile r(phi) is to be found. Solutions of the different
ial equation are derived analytically for some special transmission fu
nctions. Practically usable solutions are obtained by numerical method
s. The inverted problem consists in giving the cam profile and in adap
ting the resulting transmission function to practical criteria, e.g. a
voiding concavity of the profile lines and cusps. The profile can be l
ocated within or outside the pitch circle of the output tooth wheel. T
he mechanisms obtainable are analysed and compared, numerical examples
are given.