Abstract: A clock generator for generating a clock signal for an imaging device serving for transferring image-setting information to a rotatable printing form which includes an input to which an actual value signal dependent upon an angular position of the printing form is applicable, and an output for outputting the clock signal. It further includes a first comparator having a first input whereto the actual value signal is applicable as an analog signal, a second input to which an analog nominal value signal, respectively, representing a nominal value for the angular position of the printing form, is applicable, and an output for outputting the clock signal formed as a function of a result of a comparison between the analog actual value signal and the analog nominal value signal; an imaging device and a printing machine including the clock generator; and a method of generating a clock signal for an imaging operation.