Abstract: Printing unit for rotary printing presses having at least one printing unit and at least one ink-conduction cylinder comprising an engageable and disengageable ink-reducing unit assigned to one of the ink-conducting cylinders and having at least one roller, a doctor blade engageable with the one roller and an ink-collection trough, the one roller, while printing is stopped but while ink is being supplied, being in engagement with the ink-conducting cylinder for removing from the ink-conducting cylinder substantially a like portion of ink film which would otherwise be removed by paper being printed in the printing unit.

Abstract: A sheet transfer device for a printing machine for taking over sheets which have been aligned at front lays and for transferring the sheets to a sheet-guiding drum includes a pregripper device swivellable between a sheet takeover and a sheet transfer position. Gripper pads are carried by the pregripper device, and a gripper shaft is swivel-mounted in the pregripper device and carries gripper fingers which are associated with the gripper pads. Also provided are a device for connecting the gripper shaft and the gripper fingers so that swivelling movements of the gripper shaft are transmitted to the gripper fingers, and a swivel device for swivelling the gripper shaft about a longitudinal axis thereof.

Abstract: A cam mechanism for periodically swiveling a swivel device includes a rotatable first cam disk carrying a first cam serving as a main cam, a rotatable second cam disk carrying a second cam serving as an auxiliary cam, a first roller engaging the first cam under spring force and rollable on the first cam during rotation of the first cam disk, a second roller engaging the second cam under spring force and rollable on the second cam during rotation of the second cam disk, and a lever arrangement swivelable by the two rollers and having at least one spring for providing the spring force, including a swivel lever swivelable about a swivel axis and carrying the first roller, a swiveling movement corresponding to the first cam being impresable by the swivel lever upon the swivel device, the swivel axis and the two rollers having axes of rotation extending parallel to one another, and normals to the axes of rotation of the two rollers intersecting one another on the axis of rotation of the swivel axis and forming and

Abstract: Transmission system for forming cyclical motion from rotational motion including a device having a rotating part and at least one control lever set into cyclical motion by rotational motion of the rotating part, the one control lever and the rotating part being in cooperative engagement whereby a varying force is applied to the control lever producing a torque fluctuation in the rotational motion, includes another device for producing cyclical motion, the other device being in operative engagement with the rotating part, and spring means for applying a force to the rotating part so as to compensate for the torque fluctuation.

Abstract: Camless drive of an oscillating pregripper feeder for a sheet-fed rotary printing machine having a feed table, an impression cylinder and an oscillating pregripper feeder disposed between the feed table and the impression cylinder, the camless drive including a seven-bar linkage transmission system, the bars of which are articulatingly connected to one another solely by pivot joints, two cranks connected to the transmission system and revolvable at the same angular velocity for driving the transmission system, one of the linkages forming at least part of a pregripper of the oscillating pregripper feeder, the one linkage being disposed directly behind one of the cranks, the oscillating pregripper feeder having means for gripping a sheet to be printed which lies on the feed table, and the seven-bar linkage transmission system being actuatable by the cranks for transporting the gripped sheet along a given path directly to the impression cylinder.

Abstract: Continuously rotatable advance gripper drum assembly for sheet-fed rotary printing machines having an advance gripper drum and a gripper bridge movable relative to the drum includes a crank-driven linkage transmission device disposed on and rotatable with the drum and operatively connected to the gripper bridge for moving the gripper bridge.