JP2566677B

In a sheet processing printing machine with gripper carriages guided sinuously through the printing units on endless chains, in order to improve the mechanical forced synchronisation of said gripper carriages with the respective back pressure cylinder, the back pressure cylinders (1) have a diameter which is twice that of the plate and blanket cylinders (2, 3). Attached to the ends of the double-diameter back pressure cylinders (1) are chain wheels (34) which are likewise of double diameter and on which there are arranged two diametrically opposite fixing devices (24-32) which are adjustable both in the radial and in the tangential direction and which can also be used to fit the different printing plates together on the printed sheet (38).