Abstract: A sheet feed rotary press having a main ink feed unit and a plate cylinder, at least one of a plurality of transfer and applicator rolls coupled between the main ink feed unit and the plate cylinder being moveable to an inoperative position for selectively isolating a relatively short length group of applicator and transfer rolls from the main ink feed unit, and an additional quick acting ink feed unit that is selectively moveable into engagement with the short length roll group for supplying lesser quantities of ink to the plate cylinder through a shortened path via the short length roll group.

Abstract: The invention relates to a back-edge stop in the form of a cross-member for sheet stackers of sheet-fed presses having a vertically positionable intermediate stacker which forms a relatively large stack, the cross-member being pivotally connected to the sheet brake by way of a link parallelogram support. A sheet brake has disposed on it fixed sheet stops and at least one further fixed sheet stop having a recess in which a brush is pivotally mounted, the bristles of the brush being inclined forwardly and downwardly and extending into the major surface of the stack a distance substantially equivalent to the difference in sheet size. As the intermediate stacker rises and falls, the brush is pivoted, by way of an inclined cam surface on the cross-member, this surface being connected non-positively to engage an actuating edge of the brush to make a controlled pivoting movement around a horizontal axis extending transversely to the direction of sheet movement.

Abstract: The invention relates to a sheet turning device for rotary presses of the in-line type with double-size impression cylinders associated with a single double-size transfer or turn-over drum. To enable the sheet end to be gripped by gripper devices, the impression cylinder preceding the turn-over drum is provided with an adjustable covering, preferably a roller blind with a foil covering thereabove, to give the impression cylinder its actual diameter.

Abstract: The invention relates to a process for the production of structured retaining areas on sheet grippers, sheet gripper supports or similar gripper facilities for machines for handling and processing sheets by the formation of a non-etchable dot structure on the base member and the subsequent etching out of intervening areas. To provide structured retaining areas having a smoothly shaped surface, the dot structure is produced by screen printing or pressure pad printing and after the etching-out of unprinted areas, a hard smoothing coating, preferably of chromium or ceramic, is applied to the structural retaining area.

Abstract: The invention relates to a method of preparing a varnish blanket. Instead of a proof being used for pre-location of required varnish-free zones on a blanket for blanked-out in-line varnishing in rotary presses, the zones required not to be varnished are transferred by means of a reference copy, and after physico-chemical pretreatment adapted to the surface properties of the blanket, to a blanket stuck to a support plate. In addition to polyvinyl alcohol copying layers or coatings sensitized by bichromate, wipe-on copying layers sensitized by diazo salts are suitable, a positive or negative original being copied by direct contact in known manner onto a blanket thus pretreated. The zones required not to be varnished can therefore be preformed by cutting out the top layer of the blanket.

Abstract: To apply a cover plate on a printing cylinder, particularly to prevent corrosion of the cylinder surface, a double-side coated adhesive foil (2) is applied to a cover plate (1, 36, 65) which is wrapped about the cylinder, so that the cover plate will be adhered to the cylinder by the double-side coated adhesive foil. To install the cover plate, the cover plate (1) with the adhesive foil applied on one side, and, upon removal of a protective strip (S), is first placed in a clamping groove (34, 47, 65) of the cylinder, temporarily secured therein to provide for the adhesive to retain maximum adhesion strength, then wrapped about the cylinder, for example by a resilient pressure roller (40) while stripping off the protective strip (S) from between the cover plate and the cylinder; the end portion of the cover plate, which is left free from adhesive foil, is then wrapped about the trailing edge (52) of the groove, angled against the groove wall, and there adhered by a liquid or contact adhesive.

Abstract: A safety guard rail (7) can be moved between a position adjacent a nip between two rotating cylinders (3, 4) and a remote position. The safety guard rail has flanges (8, 9) attached thereto, projecting essentially parallel to cover plates (5, 6) already present in the printing machine. The cover plates are formed with guide slits (12, 13) extending downwardly at an inclination, in which guide elements (10, 11) engage, secured to the projecting flanges which hold the safety guard rail (7). Limit switches are coupled to be engaged by the flanges and/or the guide elements to provide ON and OFF signals, in dependence on the position of the safety guard rail with respect to the nip, to inhibit printing machine operation when the guard rail is in a remote position, for example for changing of rubber blankets on the cylinders, and permitting printing machine operation only when the safety guard rail (7) is adjacent the nip to be able to carry out its safety guarding function.

Abstract: A device for controlling the opening of a plurality of sheet grippers in a sheet-fed rotary press wherein the grippers are arranged to form a row on a gripper shaft disposed on a rotating cylinder. The gripper shaft is centrally controlled between its ends by two cam control systems acting in parallel relationship on the ends of an actuating shaft, by turning of the latter, with a central adjusting means interconnecting the actuating shaft and the gripper shaft to provide a symmetrically divided torsional force adjustable to vary the opening width of the grippers according to the sheet thickness being processed.

Abstract: The guide tube (16) is formed with a longitudinal slit which can be bent about a bending drum (6) of standard construction. In order to additionally introduce a longitudinal or spiral twist, a twisting element can be clamped about the tube, to introduce a twist, manually (FIGS. 1, 2), or upon rotating of the bending drum or disk (FIGS. 7, 8) by a coupled gearing. To retain the slit of the tube in proper dimension and alignment, and prevent deformation of the tube, a counter element with a groove (5) therein matched to the circumference of the tube is provided, and an insert strip (18) is located within the tube, which insert strip preferably has externally projecting portions (18a) for guidance of the strip between the counter element and the bending tube or disk, and a recessed portion (18b) extending within the slit (17) to prevent deformation of the tube and of the slit during twisting and/or bending of the tube.

Abstract: To permit separating a flexograph ink trough, and flexograph ductor or trough roller into axial zones for respectively differently colored inks, a separating plate is located beneath the doctor blade which has a sealing element (7) attached thereto, resiliently engaging the underside of two doctor blades (2, 3), facing the ductor or trough roller (1) from different directions to permit operation of the ductor or trough roller (1) in either direction of rotation. A low-friction surface is applied to the edge which faces the ductor or trough roller, the sealing element spanning the space between the doctor blades and being matched to the circumference of the ductor or trough roller. The doctor blades extend axially beyond the sealing elements. The separating plates and sealing elements can be mounted on units which are axially positionable along an ink trough, and hence the ductor or trough roller, at selected positions, as required by the axial extent of differently colored inking zones.

Abstract: To provide, selectively, different outputs from a cutting and folding apparatus (FIGS.

Abstract: To simplify a transverse stretching apparatus and provide rollers which do not require a change in the respective axes of rotation, two rollers are located adjacent, parallel, and spaced from each other, in which each of the rollers have outer cylindrical sections of respectively different diameters, with an intermediate essentially conical section, merging smoothly with the outer cylindrical section. The rollers are so located that the smaller diameter circumferential section of one of the rollers (4) is opposite the larger circumferential section of the other roller (5), and, when in essentially axial alignment, define a neutral position in which the sums of the diameters of the rollers at any axial plane passing transversely through the axes of rotation, will be the same. Upon relatively axially shifting the rollers with respect to each other (compare FIGS.

Abstract: To compensate for expansion and width of printed substrates, for example paper webs, when subjected to damping liquid, printing plates are located on the printing cylinder in axially shiftable adjusted position, so that register can be maintained. The register adjustment arrangement includes coupling elements (10, 13; 11, 14) engageable with an adjustment device (7, 12, 18) and engagement plates or pins (5, 6; 21, 22), the coupling device conjointly being moved by an externally engageable adjustment knob or nut by threaded engagement between the knob and nut, in which the thread coupling between an engagement plate or pin at an outermost plate is at a pitch which is higher than the thread engagement with the engagement pins or plates of a more inwardly placed printing plate. Upon rotation of the adjustment knob or nut, thus, the outermost plate will be moved axially farther than the inwardly moved plate, although both plates moving together.

Abstract: Roll-off shocks of cylinders, typically rubber blanket cylinders with respect to each other, are ameliorated or avoided by inserting a filler element into the groove which is located in the median third of the cylinder, but does not extend over the entire length thereof. The filler element is supported on the bottom of the groove, preferably over a damping or resilient element, and has a dimension which is equal to the outer circumference (44) of the bearer ring or the theoretical pitch circle (45) of a drive gear of the cylinder, with tolerance of not more than about .+-.0.05 mm. In order to insert the filler elements into the respcective grooves, the cover layers or, if necessary, also the substrate supports of rubber blankets, are removed in the region of the axial length of the filler element. Preferably, the filler elements are made of metal.

Abstract: Some conventional printing cylinders include therein a damping system having springs which receive oscillation forces transmitted from the cylinder wall, for example by cross bars, disks, or the like, to dampen oscillations occurring upon roll-off of an axial clamping groove formed in the cylinder against an engagement cylinder. To reduce not only bending and torsional oscillations, but also the effect of the impact shock when the groove rolls off against the engagement cylinder, impact positions are defined within the cylinder against which either the damping springs or elements coupled to the damping springs can engage the cylinder upon deflection thereof due to the impact shock so that the resulting elastic shock or impact is likewise transferred to the damping springs of the damping system. The damping system includes oscillation transferring rods, bars, or the like which may be embedded or at least in part contacted by elastic materials, such as foam or the like.

Abstract: To prevent entirely, or at least largely, loss of contact of a pair of blanket cylinders as they roll off against each other upon passing the respective clamping grooves of the rubber blanket cylinders, the rubber blanket cylinders adjacent the edges of the clamping groove (13,14) are formed with transition zones (15,17; 16,18) which rise above a circle formed by the cylinders, in cross section. The rise (Y) is in accordance with a non-circular mathematical function, and, for a cylinder of, for example, about 20 cm diameter, can be in the order of 0.1 mm. At operating speeds of current rotary offset printing machines, the rubber blankets will hardly lose contact from each other and thus stripping formation, due to oscillations of the blanket cylinders as they roll off against each other, is effectively eliminated.

Abstract: A device for turning over sheets in rotary presses of in-line construction, in which the impression cylinders of consecutive printing units cooperate with a single double-size transfer drum with which a storage drum is associated and gripper transfer facilities are provided which consist of cooperating rows of clamping grippers including fixed-position first-printing grippers cooperating with clamping grippers of the storage drum for turning the sheet over at the transfer drum, second-printing grippers which are adjustable with respect to the sheet format, and smoothing devices adjustable with respect to the sheet end are disposed after the clamping grippers on the storage drum as viewed in the direction of rotation.

Abstract: A mounting assembly for bearing races is provided which enables split races for roller bearings to be fixed on a bearing member in a space-saving system wherein the bearing member includes at least one race groove parallel to two expanding grooves such that narrow webs are left on either side of the race groove. On assembly, for example, of the inner ring of a roller bearing in the race groove, these webs are flanged or crimped against the bearing end faces such that two ends of the axially split bearing race are securely held by appropriate profiling or beveling of the end faces of the race. Assembly may be carried out by inserting a crimping wheel into the expanding grooves and crimping the webs by means of a conically deforming surface. The mounting can be advantageously applied, for example, in connection with an eccentrically drilled bearing bushing for the plain bearings of blanket cylinders in offset printing machines.

Abstract: A series-produced sheet-fed offset rotary press having drum transfer systems in which sheet conveyance is carried out entirely through mechanical gripper transfers from a first impression cylinder to a transfer cylinder, then successively to a double-size transfer drum, then to a turning cylinder and then to a second impression cylinder and which are selectively engageable for multi-color printing on one side or alternately for perfecting printing and wherein, to change over sheet movement between these two operational modes the double-size transfer drum is selectively movable into one of two positions and is variable in its direction of rotation, the double-size transfer drum being engageable, in the first position and first direction of rotation and with the transfer cylinder disengaged, with two double-size impression cylinders for one-sided multi-color printing; while, in a second position and in the second direction of rotation, for perfecting, the double-size transfer drum can be lowered into engagement

Abstract: To minimize the number of components of the printing system and require only a single impression cylinder, a sheet transport chain is carried about a second one of three rubber cylinders (3, 5, 7) to receive a sheet from the impression cylinder (2) to which the sheet is first applied for a first prime printing by a first rubber cylinder (3), the sheet being led about the second rubber cylinder and between a third rubber cylinder (7) which applies verso printing thereon, with the second rubber cylinder acting as a counter or impression cylinder for the third rubber cylinder; each one of the rubber cylinders has a plate cylinder (4, 6, 8) associated therewith, the second rubber cylinder applying the second prime print being positioned above the chain drive, the first rubber cylinder and the first plate cylinder being positioned above the impression cylinder (2) and the third blanket cylinder and the third plate cylinder being positioned below the printing cylinder, thus providing for compact construction of the