a required angular position it is necessary to provide a sensor operative to generate signals or from which signals can be derived indicative of the position of the print element one form of such a sensor is described in the specification of british pat no 2034991 the sensor comprises a pattern of conductive tracks in the form of concentric part circular segments so arranged and interconnected that as they are swept by rotatable contacts a 2 34 out of 5 34 code signal is derived which represents the angular position of the rotatable contacts a sensor of this type is provided in the present embodiment by electrical contacts 29 carried on a face of the intermediate pinion 18 adjacent the surface of the printed circuit board and concentric part circular conductive segments 35 formed by conductive tracks on the face of the substrate concentric with the axis of the stub shaft 19 thus the intermediate pinion 18 serves not only to transmit mechanical torque from the motor to the slidable carriage but also carries the rotatable part of the angular position sensor as mentioned above franking machines commonly are required to print franking values having up to four digits each printing element is formed to print a single digit and therefore four printing elements are provided each individually settable to a selected value thus although for clarity in the drawing only a single printing element and associated print setting elements and drive motor are shown it is to be understood that a motor gear train sensor carriage and selector bar are provided for each print element which it is desired to set.