Patent ID: 6796239
Filing Date: 2004-09-28
Classification: B41F

Abstract:
A sheet-fed printing press operable in printing mode and imaging mode, the printing press comprising:a control device; a gear train including toothed gearwheels having teeth; at least one printing unit having a plurality of cylinders including a sheet conveying impression cylinder, a transfer cylinder, and a printing form cylinder; each of said plurality of cylinders having a respective one of said gearwheels and, in the printing mode, said cylinders being coupled with one another by said gear train and said teeth of said gearwheels of said printing form cylinder and said transfer cylinder making single-sided contact; an imaging device associated with said printing form cylinder for producing a printing form within the printing press; at least one first motor connected to said control device for driving said cylinders in the printing mode and in the imaging mode; a second motor connected to said control device for driving the printing form cylinder in the imaging mode; a first rotary position transducer connected to said control device and configured for determining an angular position of said cylinders in the printing mode; a second rotary position transducer connected to said control device and configured for determining the angular position of the printing form cylinder in the imaging mode, and, in the imaging mode, said second motor driving said printing form cylinder for preventing contact between said respective teeth of said gearwheels of said printing form cylinder and of said transfer cylinder.