Abstract: A printing machine includes a printing form, an optical imaging unit for directly imaging the printing form, and an inking unit for inking the printing form, the printing form having a surface formed of a material with wetting properties reversibly changeable between a state with a very small contact angle and a state with a relatively large contact angle, the state with a small contact angle being achievable by action of light having a wavelength shorter than a material-specific wavelength, and a cleaning device for cleaning the surface of the printing form; and a printing process performed with the printing machine.

Abstract: Device for conveying flexible printing forms away from a printing-form cylinder of a printing press includes a structure defining a conveying plane over which the printing forms are guidable, a conveying device leading away from the printing-form cylinder over a deflecting region adjacent to the conveying plane, and a feeding device cooperatively engaging the conveying device for feeding the printing forms to a repository.

Abstract: A plate cylinder for rotary printing presses, in which the printing plate inside the machine is manufactured digitally, e.g. by spark erosion, and in which the covering with printing foil and the changing of individual segments of the foil following printing is done simply, automatically and with maximum precision inside the machine, with the use of a replaceable cartridge for the printing foil.

Abstract: A sealing device for a dampening unit on an offset printing press having a channel for receiving a dampening-solution supply and defined by a dampening-solution applicator roller and a metering roller which roll on one another, and having a seal holder mountable on a side part of the dampening unit and being in contact engagement with a sealing element, closing off one end of the channel, the sealing element having formed with an overflow opening for excess dampening solution, comprising a drain passage located between the sealing element and the seal holder and formed by a cutout on a side of the sealing element facing away from the channel, the cutout being connected with the overflow opening.

Abstract: A device conveys and aligns sheets on a feed table of a printing machine having a single-sheet feeder, an aligning section, and a conveying device revolving on shafts for conveying the sheets in a direction across the aligning section to feed rollers for feeding the sheets to an impression cylinder. Bearings are secured to side frames of the feed table so as to be cyclically adjustable in elevation. The shafts are rotatably mounted in the bearings and are cyclically displaceable laterally to the sheet-conveying direction. A guide device is secured in the side frames. A feed plate is carried by the guide device above the feed table and is laterally adjustable with respect to the position thereof on the guide device. The conveying device includes a revolving conveyor device disposed below the feed plate. The feed plate is formed with aligning edges disposed laterally forward of and behind the revolving conveyor device and constitutes a lateral aligning limit.

Abstract: Dampening unit for an offset printing machine includes a metering roller, a dampening form roller for applying dampening medium to a plate cylinder of the printing machine, the metering roller and the form roller being in mutually pressing engagement at a contact zone along respective axially parallel lines on respective casings of the rollers, a drive for rotating the metering roller and the form rolelr with circumferential speeds which are substantially in a downward direction in vicinity of the contact zone, a storage space for dampening medium located above the contact zone and defined by surfaces of the casings of the metering roller and the form roller and sealing elements located at respective ends of the metering roller and the form roller, and a traversing distributor roller disposed in direct friction contact with the metering roller.

Abstract: A device for performing a circumferential-register adjustment in a sheet-fed rotary printing press with a printing unit including an impression cylinder, a blanket cylinder and at least one plate cylinder engageable with the blanket cylinder and drivable by the impression cylinder via an intermediate gearwheel, comprising a mounting movable with respect to the machine frame, the one plate cylinder being held in the mounting together with the intermediate gearwheel as well as with inking and dampening units assigned to the plate cylinder, the mounting being held in the machine frame so as to be swivellable about an axis disposed parallel to axes of the cylinders of the printing unit and lying at a point of intersection of a straight connecting line through the axes of the impression cylinder and the intermediate gearwheel.

Abstract: A dampening unit for an offset printing machine, includes a roller pair consisting of a metering roller, and a dampening form roller for applying dampening medium to a plate cylinder of the printing machine, the metering roller and the form roller being in mutually pressing engagement at a first contact zone along respective axially parallel lines on respective casings of the roller pair, a gear drive for driving the roller pair with circumferential speeds of the metering roller and the form roller substantially in a downward direction in vicinity of the contact zone, and means defining a storage space for dampening medium located above the contact zone and including surfaces of the casings of the roller pair and sealing elements located at respective ends of the roller pair, only the metering roller of the roller pair being driven by a gear meshing with a drive gear of the gear drive, the form roller being in driven engagement via friction contact at the first contact zone in a first position of the form rol

Abstract: A device for mounting film in register for producing printing plates for small offset printing presses includes a universally applicable template having a plurality of differently shaped pins each corresponding to conventionally used register-hole systems for suspending a superimposed register sheet serving as an original, and a mounting foil serving as a film mounting, the register sheet and the mounting foil having register holes of at least one of the conventionally used systems formed therein and matching the shape of one of the pins.

Abstract: A plate cylinder for rotary printing presses, in which the printing plate inside the machine is manufactured digitally, e.g. by spark erosion, and in which the covering with printing foil and the changing of individual segments of the foil following printing is done simply, automatically and with maximum precision inside the machine, with the use of a replaceable cartridge for the printing foil.