Abstract: Transfer drum for a sheet-fed rotary printing press includes a pair of spaced support discs mountable on a shaft of the printing press, a drum shell peripherally secured to the support discs and having an outer surface, a blanket reinforced with fabric plies and tautly covering the outer surface, the fabric plies being subjected to tensile force acting in a given direction, the blanket having two ends, and means for securing the ends of the blanket to the drum shell, the fabric plies being elastic in the given direction of action of the tensile force.

Abstract: Drive for sheet-fed rotary printing machines with at least two tandem-mounted printing units driven by a closed gear train and including a drive motor including a drive train driven by the motor and extending parallel to the closed gear train, at least two force input locations connecting the closed gear train to the drive train a first displaceably mounted transmission member connected forward of one of the force input locations, a second transmission member corresponding to the first member connected forward of the other of the force input locations, and transmission means connecting the first transmission member to the second transmission member.

Abstract: In a dampening unit for offset printing machines having a dampening-medium tank, a rotating screen cylinder formed of a perforated support member covered by a blanket for conveying dampening medium supplied thereto from the tank, and a blow tube located adjacent the blanket and formed with nozzle openings for spraying the dampening medium by means of blowing air from the blanket onto a dampening unit roller, the improvement therein which includes means for freely rotatingly guiding the screen cylinder, and a driven dampening-medium conveying roller immersed in the dampening medium received in the tank and being in frictional engagement with the screen cylinder so as to feed the dampening medium from the tank to the blanket.

Abstract: A rotary printing machine having a plurality of serially disposed printing units, each including two blanket cylinders in mutual contact and two plate cylinders respectively cooperating with one of the blanket cylinders, and a main drive system individually driving each of the plate cylinders, the main drive system of each of the printing units comprising two spur gears in mutually meshing engagement and in meshing engagement with the spur gears of the respective main drive system of the printing units immediately adjacent thereto, each of the plate cylinders having a drive gear in meshing engagement with one of the two spur gears and, in combination with the main drive system, a drive system serially associated therewith and comprising two additional spur gears coupling each of the plate cylinders to a respective blanket cylinder, the additional spur gears being disposed adjacent the main drive system in a gear line different from that of the main drive system.

Abstract: Device for adjusting circumferential and lateral register in a rotary printing machine having support frames at opposite drive and operating sides thereof and a plate cylinder drivable by a spur gear at the drive side, including first and second adjusting members on the operating side for turning the plate cylinder radially relative to the spur gear for driving the plate cylinder for circumferential register adjustment and for axially displacing the plate cylinder for lateral register adjustment. An adjusting spindle which extends axially through a bore formed in the plate cylinder is coupled at the operating side to the first adjusting member and is connected, at the drive side, to a threaded member. A thrust bearing is operatively associated with the threaded member and with the spur gear driving the plate cylinder.

Abstract: Drive for sheet-fed rotary printing machines with at least two tandem-mounted printing units driven by a closed gear train and including a drive motor including a drive train driven by the motor and extending parallel to the closed gear train, at least two force input locations connecting the closed gear train to the drive train a first displaceably mounted transmission member connected forward of one of the force input locations, a second transmission member corresponding to the first member connected forward of the other of the force input locations, and transmission means connecting the first transmission member to the second transmission member.

Abstract: Sheet turn-over device for a one-side printing and perfecting press with clamping grippers pivotable about a rotary axis and mounted in a sheet turn-over cylinder so as to be adjustable from single-side printing to one-side printing and perfecting includes a gripper shaft coextensive with the rotary axis about which the clamping grippers are pivotable, a gripper tube coaxially disposed on the gripper shaft and separate control means for respectively driving the gripper shaft and the gripper tube. The rotary axis of the gripper shaft as well as of the gripper tube have a location radially inward from a point on a tangent to the periphery of the sheet turn-over cylinder at the point of clamping contact of the grippers.

Abstract: Inking unit for a printing machine includes an ink duct, a ductor roller having a surface engageable with ink received in the ink duct, an ink transfer roller for transferring ink from the ductor roller to other rollers, a ductor knife engageable along the length thereof with the surface of the ductor roller and adjustable in position relative to the surface of the ductor roller in zones extending along the length of the ductor knife for controlling the amount of ink to be transferred, and means for adjusting the zones of the ductor knife pulse-like into engagement with and disengagement from the surface of the ductor roller with strokes of equal length and with a stepwise variable stroke time.

Abstract: Ink fountain assembly for a printing press including an ink fountain, a fountain roller engageable in the ink fountain for transferring ink therefrom to a printing unit of a printing press, an ink knife having a scraper edge on one side thereof engageable with the peripheral surface of the fountain roller for scraping ink therefrom, the ink knife being divided into individual zones on a part thereof located on the side opposite the said one side thereof on which the scraper edge is located; means for clamping the ink knife in a fixed position relative to the roller; and means for adjusting the relationship of the ink knife to the fountain roller zonewise.

Abstract: A sheet transfer device of a printing press includes a plurality of conveyor belts of relatively narrow cross section compared to the width of a sheet being transferred thereby, and an elongated suction chamber formed with an elongated orifice extending in the direction of sheet transfer. Sealing beads formed at each end of the orifice cooperate with the belts at each side of the orifice to form a sealing extension of the elongated orifice.

Abstract: Drive for multi-color sheet-fed rotary printing machines with tandem-mounted printing units driven by a closed gear train and including a drive motor is provided with a transmission or drive train driven by the motor and extending parallel to the closed gear train at least two force input locations connecting the closed gear train to the transmission train, n-1 torque limiters, wherein n is equal to the number of force input locations, being provided in the transmission train, one of the force input locations being disposed in a path of direct power flow between the motor and the gear train.

Abstract: Sheet transfer drum for a printing press includes a shaft, a drum body fixed to the shaft, the drum body including a tube segment having two longitudinal edges, and respective guide rings fixed to both ends of the tube segment, the longitudinal edges of the tube segment defining a gap therebetween a gripper assembly is received in the gap and includes a gripper shaft, a row of grippers fixed to the gripper shaft and a vertically adjustable gripper bearing bar cooperating with the row of grippers for gripping a sheet to be transferred by the sheet transfer drum. A bearing is received in the gap for securing the gripper assembly to the shaft. The guide rings are formed with respective slots extending in peripheral direction of the drum body, and threaded fasteners respectively extend through the slots and releasably secure the guide rings to the shaft within the range of the slots.

Abstract: Sheet guiding cylinder for printing machines formed with a cylinder channel and having a clamping device disposed in the channel for gripping a sheet that is to be imprinted, the cylinder having a rotary axis and being rotatable in a given rotary direction, and includes a cylinder casing whereon a sheet to be imprinted is supportable, a plurality of rows of nozzles connectible to pressurized air-producing means, the rows of nozzles being disposed in the cylinder casing and extending parallel to the cylinder axis, and a plurality of peripheral flow channels formed at the outer surface of the cylinder casing and being at least partly coverable by the sheet to be imprinted, the nozzles of the rows of nozzles communicating respectively with the flow channels, the flow channels being disposed substantially parallel to the cylinder axis and having a cross section increasing with increasing distance from the nozzles in a peripheral direction opposite to the given rotary direction of the cylinder.

Abstract: Sheet pile elevator in a sheet delivery system of a printing machine having a sheet pile table located within a framework of the sheet delivery system includes a short shaft stub mounted on the framework above each of the corners of the sheet pile table and carrying a rotary guide roller, a lifting chain articulatingly secured at each of the corners of the table and extending upwardly and over a respective guide roller, and a sprocket wheel for each of the lifting chains located at one side of the table and mounted in common on a single drive shaft having a rotary axis extending in a direction wherein sheets piled on the table are feedable therefrom for processing, the lifting chains having a free end, respectively, leading to a respective sprocket wheel.