Patent ID: 6427590
Filing Date: 2002-08-06
Classification: B41F

Abstract:
A printing press comprising:a gear train; a plurality of printing units mechanically interconnected by said gear train; a plurality of electric drive motors connected to said gear train for supplying power to said gear train in a preset torque ratio, each one of said plurality of electric drive motors connected to drive a respective one of said plurality of printing units; an electronic control device; and means for supplying to said electronic control device information regarding printing-specific variables; said control device having a computing device for individually determining load-torque changes in said plurality of said printing units from said information regarding said printing-specific variables; said control device including a current generation unit for generating currents in response to said determined load-torque changes and for supplying said currents to the plurality of electric drive motors so that power flow in said gear train is constant when averaged over time; and said gear train deriving power solely from said plurality of said electric drive motors.