Patent ID: 6851360

Claim:
A satellite-type printing press for selective two side printing of a sheet of material comprising: a common pressure cylinder on which a sheet of material can be advanced from an upstream supply station to a downstream delivery station, first and second printing means angularly spaced around said common pressure cylinder for effecting color printing on said sheet of material while being advanced on said common pressure cylinder, and sheet perfecting apparatus disposed between said first and second printing means for inverting said sheet of material so that the first printing means prints on one side of said sheet of material and the second printing means prints on an opposite side of said sheet of material, said sheet perfecting apparatus being selectively separable from said common pressure cylinder whereby to enable said printing press to selectively effect one or two sided printing of said sheet of material, wherein said sheet perfecting apparatus comprises first and second sheet transfer cylinders and a sheet perfecting cylinder between said first and second sheet transfer cylinders, wherein after the first printing means has printed on a top surface of the sheet of material, a gripper on the first transfer cylinder grips a front end of the sheet of material to transfer the sheet of material thereon until a rear end of the sheet of material is adjacent to said perfecting cylinder whereupon a gripper on said perfecting cylinder grips the rear end of the sheet of material and advances the sheet of material, rear end first, in inverted condition to the second transfer cylinder which returns the sheet of material to the common pressure cylinder with a bottom surface of the sheet of material facing upwards for being printed by said second printing means.