Transmission system for forming cyclical motion from rotational motion printing press with counterbalance for torque fluctuation of gripper feed drum

Claim 1

Sheet-fed printing press having a register feed drum having sheet grippers thereon including a transmission system for forming cyclical motion from rotational motion so as to produce movement of said grippers located on the register feed drum including a device having a rotation part and at least one control lever set into cyclical motion by rotational motion of the rotating part, said one control lever being connected to said grippers, the one control lever and the rotating part being in cooperative engagement whereby a varying force resulting from nonuniformly acting forces and displaced masses of said grippers is applied to the control lever producing a torque fluctuation in the rotational motion, comprising another device for producing cyclical motion, said other device having a rotary cam in operative engagement with the rotating part, so as to rotate therewith, another control lever having a cam roller engaging with and rolling on said rotary cam and compressive spring means abutting a frame of the printing press and applying a force to and through said cam roller to the rotating part so as to counterbalance said acting forces and displaced masses of said grippers and compensate for the torque fluctuation, wherein the first-mentioned device further includes a cam disposed on the rotating part, and the one control lever has a roller in rolling contact with the cam of the first-mentioned device, and wherein said rotary cam is mounted on the rotating part, said cam roller being located on said other control lever, and wherein said compressive spring means applies a force to said roller of said other control lever so that a torque acting via said rotary cam on the rotating part is opposite in phase to a torque acting via the cam of the first-mentioned device disposed on the rotating part.