Patent ID: 6070529
Filing Date: 2000-06-06
Classification: B41F,B41P

Abstract:
A printing press comprising:an impression cylinder rotatable about a first axis;a plate cylinder defining a nip with said impression cylinder, said plate cylinder being rotatable about a second axis spaced from said first axis, said plate cylinder printing an image on material traveling through said nip;a drive shaft drivingly connected to said impression cylinder to rotate said impression cylinder about said first axis in response to rotation of said drive shaft, a first gear mounted on said drive shaft and drivingly connected to said drive shaft to rotate with said drive shaft;a differential mechanism driven by said first gear;a second gear mounted on said drive shaft for rotation relative to said drive shaft, said second gear being rotatably driven by said differential mechanism;a third gear in mesh with said second gear, said third gear drivingly connected with said plate cylinder to rotate said plate cylinder about said second axis; anda correction drive motor drivingly connected with said differential mechanism for, when energized, varying the speed at which said differential mechanism drives said second gear to vary the speed of rotation of said plate cylinder relative to said impression cylinder.