the invention relates to a direct drive for a cylinder of a converting machine , in particular a printing press or coating machine that converts sheet - type printed materials . the aim of the invention is to develop a direct drive for a cylinder of the afore - mentioned type in such a way that the required lateral corrections are significantly reduced . to this end , the direct drive includes a rotor that is detachably mounted on the end of the cylinder and a stator that is concentric with the rotor and is detachably fixed to the side frame . a register motor , which is fixed to the frame , is coupled to gearing and this gearing is coupled to a helical gear or screw drive , which is in turn coupled to the cylinder by means of an axial / rotative coupling .