Abstract: A sheet transfer system on a rotary printing press has an apparatus provided beneath the delivered sheets to slow down the sheets at their trailing end by means of conveyor belts which are guided by drive and deflector rollers, and between which, beneath the conveyor belt, there is a suction chamber, whereby even with a tight sheet sequence and high machine speed, a collison of the sheets during the deceleration process is prevented so that the sheets are slowed down and lowered onto the sheet delivery stack.

Abstract: A device for tensioning a flexible printing plate mounted on a plate cylinder of a rotary printing machine having a device for pivoting the printing plate on the plate cylinder so as to provide a register correction, the printing plate having ends which are clamped in tensioning rails, include respective pivot levers via which the tensioning rails are articulatingly connected at both ends thereof, respectively, the pivot levers being pivotally mounted on a cylinder body, and a cam device for tipping and displacing the tensioning rails relatively to one another so that the printing plate is pivotable about a precisely defined pivot point.

Abstract: In a washing device for an impression cylinder of a printing machine, there is provided a washing roller capable of being brought into contact with and liftable away from a cylindrical jacket surface of the impression cylinder in vicinity of a gripper bridge of the impression cylinder, and being sprayable with cleaning solution, the washing roller comprising a washing brush extending over substantially the entire length of the impression cylinder and being separately driven, the washing roller being rotatable in a direction opposite the direction of rotation of the impression cylinder and being rotatable at a higher speed than the rotating speed of the impression cylinder, the washing roller being movable automatically into its contact with the impression cylinder.

Abstract: A device for clamping and aligning a flexible printing plate on a plate cylinder of a printing machine, the device having two clamping rails disposed in a channel formed in and extending in a direction parallel to the axis of the plate cylinder for receiving therein a leading and trailing edge of a printing plate disposed on the periphery of the printing cylinder at which a beginning and an end of a sheet are printed, guides disposed in the channel wherein the clamping rails are guidably movable generally in peripheral direction of the plate and clamping bolts cooperatively engaging at least one of the clamping rails for clamping the printing plate in peripheral direction of the plate cylinder includes at least one clamping spring carried by one of the clamping rails for biasing the one clamping spring in a direction of action of the tensile force of the flexible printing plate so as to hold the printing plate under pretensioning in a predeterminable nominal position and free of play.

Abstract: A device for controlling, by a measuring technique, the dampening medium guidance zonewise in an inking unit of an offset printing machine includes a measuring roller engaging an ink applicator roller of the inking unit and having interfaced oleophilic and hydrophilic surface regions, and an optoelectronic measuring device disposed adjacent to the measuring roller and operating thereon over the entire width thereof at a spaced distance therefrom, and wherein at least the oleophilic surface regions of the measuring roller is formed as a screen.

Abstract: A device for securing flexible printing plates under tension on a plate cylinder of a rotary printing machine having tensioning rails operatively associated with both ends of the plate and being braceable against side walls of a transverse channel formed in the plate cylinder for tensioning the printing plate includes a device for selectively stretching and compressing at least one of the ends of a printing plate in axial direction of the plate cylinder, the tensioning rail operatively associated with the one plate end being of one-piece construction and having a clamping member disposed at a middle region thereof and respective tensioning segments disposed at end regions thereof and actuable for stretching and compressing the one plate end.

Abstract: A device for aligning sheets fed by a sheet feeder to a sheet-processing machine includes a suction pull bar located in an aligning region of the sheet feeder, drive device for reciprocatingly displacing the suction pull bar in the plane of a sheet transversely to sheet travel direction through the sheet feeder, air control device through which the drive device is connected to a vacuum generator, positioning device for controlling the drive device the suction pull bar being acuatable for applying suction to the underside of a sheet which has reached the aligning region and after the sheet has been aligned by the leading edge thereof, the suction bar being actuatable for moving the sheet into an in-register side position and having device for applying fresh air thereto for releasing the sheet exactly in the side position simultaneously with a take-over of the sheet-in register by the sheet conveying device and a method for operating the device.

Abstract: A method of metering ink in offset printing machines having an ink cylinder with which a metering member adjustable into contact with the ink cylinder with a given pressure is associated, includes varying the contact pressure of the metering member against the ink cylinder as a function of at least one of the viscosity of the ink in a metering gap, the supply of dampening medium and the peripheral speed of the ink cylinder so that a constant specifiable thickness of ink film on the ink cylinder and a constant specifiable intensity of ink impression on the material to be printed is settable, and a device for carrying out the method.

Abstract: A measuring device which is equipped with a number of sensors determines the area coverage of a printing original or printing plate for printing presses. Each individual sensor of the measuring device is calibrated with the air of calibration strips. By means of an additional sensor of the measuring device, a printing-plate and/or printing-original-specific correction calibration and an adjustment to identical values of all sensors are provided. The correction calibration and adjustment are performed by way of a calibration field and a calibration area on the printing plate and/or printing original.

Abstract: Register system for in-register alignment of a flexible printing plate on a plate cylinder of a rotary printing machine includes means defining at least two register punch-holes formed in the printing plate and register markings corresponding thereto formed in the plate cylinder, the printing plate having a lower surface towards the plate cylinder and the plate cylinder having a rotary axis, the register markings being at a radial distance from the axis of the plate cylinder at most equal to the radial distance of the lower surface of the printing plate thereform, the register markings comprising respective surface areas slightly smaller than and geometrically similar to a cross-sectional area of the register punch-holes and having an appearance contrasting with the surroundings thereof, the register markings, in clamped condition of the printing plate on the printing cylinder, being disposable in contact-free coincidence with the register punch-holes.

Abstract: Sheet turning device for small offset printing machines, comprising a conveyor system with gripper bridges linking two adjacent small offset printing machines for transporting a sheet having at least one printing performed thereon from one of the small offset printing machines to the other, the conveyor system being formed of two endless conveyor strands extending parallel to one another and being twisted in the form of a Mobius band, one part of the conveyor system extending between pairs of sprockets and Mobius-band twist formed therein, while the other part of the conveyor system is located opposite the one part and extends rectilinearly, so that the sheet transported in the region of the one part of the conveyor system is turned around the longitudinal axis thereof as it is being transported.

Abstract: Sheet-guiding drum for sheet-fed rotary printing machines, having a drum body carrying at least two gripper bridges adjustable to different paper thicknesses, includes gripper supports carried by the drum, the gripper supports being adjustable in at least substantially radial direction of the drum; play-free adjusting elements carried by the drum body and adjustable independently of one another for adjusting the gripper supports; and a central adjusting device mounted readily accessibly on the drum body for actuating the adjusting elements in common.

Abstract: A printing unit of an offset rotary printing machine for printing a paper web with an endless impression, the printing unit having two plate cylinders with respective printing plates disposed on half the respective peripheries thereof for providing respective partial prints successively includes at least one blanket cylinder operatively associated with the two plate cylinders, an applicating roller equal in size to that of one of the plate cylinders disposed for simultaneous engagement with both of the plate cylinders, an inking unit and a dampening unit operatively connectible via an inking cylinder with both of the plate cylinders for delivering ink and dampening fluid thereto, a sum of distances starting from a contact location at which successive partial prints provided by the two plate cylinders become united and extending via the at least one blanket cylinder, one of the plate cylinders and the inking cylinder back to the contact location corresponds to a multiple of the periphery of one of the two plat

Abstract: A device for aligning sheets fed by a sheet feeder to a sheet-processing machine includes a suction pull bar located in an aligning region of the sheet feeder, drive device for reciprocatingly displacing the suction pull bar in the plane of a sheet transversely to sheet travel direction through the sheet feeder, air control device through which the drive device is connected to a vacuum generator, positioning device for controlling the drive device the suction pull bar being acuatable for applying suction to the underside of a sheet which has reached the aligning region and after the sheet has been aligned by the leading edge thereof, the suction bar being actuatable for moving the sheet into an in-register side position and having device for applying fresh air thereto for releasing the sheet exactly in the side position simultaneously with a take-over of the sheet-in register by the sheet conveying device and a method for operating the device.

Abstract: A method of feeding sheets in register in a sheet-processing machine wherein the sheets are conveyed in a given direction in the machine, which includes, during conveyance of the sheets, initially displacing the sheets, respectively, by means of an aligning device, in a direction substantially perpendicularly to an edge thereof which is to be aligned, so that the edge of the sheet passes a measuring zone of a scanning device and clears the scanning device; generating a signal in response to clearance of the scanning device by the sheet edge and, in response to the generated signal, further displacing the sheet a given distance from the measuring zone of the scanning device to a position wherein the respective sheets are in register.

Abstract: A printing unit with a short inking unit, the printing unit having mutually engageable impression, blanket and plate cylinders and at least one applicator roller having a size comparable to that of the cylinders for feeding both dampening medium and ink includes an inking cylinder, the inking cylinder and the plate cylinder being disposed relative to one another and to the blanket cylinder in a manner that the blanket cylinder is selectively engageable alternatively with one of the inking cylinders and the plate cylinder, the blanket cylinder being coverable selectively by a blanket and a rubber block, the inking cylinder having a ductor blade engageable therewith, the applicator roller being separated from the inking cylinder in a condition of the printing unit wherein the blanket cylinder is covered by the rubber block and is in direct cooperative engagement with the inking cylinder.

Abstract: Method of evaluating faults on printed sheets by means of a reflectance meter and test fields which includes:detecting by a measuring technique reflectance values of four test fields one of which is a full tone field and the other three are line screen test fields having screen lines disposed at varying angles yet exhibiting equal screen width and equal screen tone values in the film,mathematically determining the screen tone value in a print, deducting any effect of slip and mackling from the measured four reflectance values or from the screen tone values in the three line screen test fields ascertainable therefrom; and selectively indicating these values.

Abstract: In a rotary printing machine, a register adjustment device for adjusting circumferential register and lateral register of a plate cylinder mounted for displacement in axial direction thereof and being connected to a device for displacing the plate cylinder in axial direction includes a double gear having first and second toothings thereon, one of the toothings having obliquely extending teeth and the other of the toothings having teeth extending in a direction differing from the direction in which the teeth of the one toothing extend, both the first and the second toothings being immovable relative to one another, the double gear being also mounted for displacement in axial direction thereof and being connected to a device for displacing the double gear; a drive gear meshing with the first toothing; and a further gear meshing with the second toothing, the further gear being connected with the plate cylinder and fixed thereto against relative rotation therewith and against relative displacement in axial direct

Abstract: A device for register-maintaining alignment of a flexible printing plate of a plate cylinder of a rotary printing machine, the plate cylinder being formed with a cylinder channel, tensioning rails being disposed in the channel and clamping rails for firmly clamping a respective end of the printing plate on the tensioning rails, the tensioning rails being adjustable in peripheral direction of the plate cylinder by tensioning screws includes a device for scanning the position of the printing plate in vicinity of a leading edge of the printing plate, and an electrical display device for indicating the scanned position of the printing plate, the scanning device including sensors respectively engageable in register holes formed in the printing plate in vicinity of the leading edge of the printing plate, when the printing plate is placed upon the plate cylinder, a holder carrying the sensors and extending parallel to the axis of the plate cylinder within the cylinder channel, the sensors being pivotable in peripher

Abstract: An apparatus for in-register feeding a sheet into a sheet-processing machine by conveying the sheet in a given feed direction over a feed table includes front lays engageably by a leading edge of the sheet for aligning the leading edge of the sheet, a pair of said pull-type lays located in the feed table respectively on mutually opposite operator and drive sides of the feed table at a slight spacing from the front lays, both the side lays being movable in the plane of the feed table transversely to the given feed direction of the sheet, a device for driving at least one of the side lays, a device for positioning the sheet having at least one sensor for controlling a displacement stroke of the driven side lay, an air control device connected to a vacuum generator and to both of the side lays for controlling suction air flow to the side lays, at least one of the side lays having a device for applying suction to the sheet until static friction is assured preparatory to aligning a respective lateral edge of the s