Abstract: A dampening system for planographic printing presses having a roller means for feeding dampening solution injected by a nozzle means onto the surface of a plate cylinder comprises a motor for moving the nozzle means, a nozzle position signal output means for outputting the present position of the nozzle means, a moving position setting means for setting moving position to which the nozzle means is to be moved, and a data select signal output means for outputting an access signal in accordance with the operating speed of the printing press, and controls the distance between the roller means and the nozzle means in accordance with the operating speed of the printing press.

Abstract: The invention relates to a method of generating proofs of print signatures composed of first and second flats printed on opposite sides of a sheet.

Abstract: A method and an apparatus for displacing at least one roller of an offset rotary printing press. An arrangement is provided for affording the displaceability of at least one roller in a highly versatile and adaptable manner. Displacement of the at least one roller in question can be undertaken in such a manner as to markedly facilitate the operation of a printing press.

Abstract: A method and an apparatus for controlling the sheet supply in a sheet-processing printing machine, in particular a sheet-fed offset printing machine. In order that, at the beginning of printing, before which a specific process for predamping and/or preinking the plate and/or blanket cylinders takes place, a first sheet always runs into the printing zone precisely on completion of the process, provision is made for a first sheet to be conveyed by means of the engagement and renewed disengagement of the feeder into a predetermined position from which the number of machine revolutions up to reaching the first printing zone is known. The feeder is disconnected and the separator and pull suckers remain pressurized, thereby continuing to hold a sheet gripped. The process for predamping and/or preinking is then started, whereupon the reengagement of the feeder takes place precisely at that moment after which a first sheet then runs into the first printing zone precisely on completion of the process sequence.

Abstract: An ink supplying and collecting device for an ink reservoir formed between a main roll for applying an ink to a plate cylinder and an auxiliary roll in contact with the main roll, the device being adapted to supply the ink to the ink reservoir by causing the ink to flow out from a nozzle extending downward as directed toward the ink reservoir while moving the nozzle in parallel to axia direction of the rolls, and to collect the ink by lowering the nozzle to a position close to the bottom of the ink reservoir and drawing up the ink with the nozzle while moving the nozzle in parallel to the axial direction of the rolls.

Abstract: The offset printing machine comprises at least one flexible ink blade (14) which, angled in the direction of an ink roller (12), borders an ink bath (40) and can be bent in zones to different degrees against the cylindrical surface of the ink roller (12), and adjustment means for bending the ink blade edge (36). The adjustment means has tappets (92) axially displaceable in a guide and an adjustment cam (62) allocated to each, with the cam axis (L) parallel to the ink roller axis (A). The tappets (92), preferably individually adjustable length-wise, are pressed by springs (100) against the peripheral surface (72) of the adjustment cam (62). The self-locking positionable adjustment cams (62) are arranged alternately in the modular principle with bearing jaws (64) for their non-rotatable coaxial bearing bolts (60) on a mounting rail (56), for interchargeable mounting as a control unit (58) directly or via an adapter on an offset printing machine.

Abstract: A system for supplying dampening fluid to a lithographic press dampening system. The system prevents dampening fluid starvation at a metering nip located between dampening system rollers, and minimizes contamination of the dampening fluid in the dampening system. A pre-determined distance is maintained between (1) the surface of a roller partially immersed in dampening fluid and (2) a fluid collection pan, so as to remove contaminants from the system. Sensors are used to determine the proper level of dampening fluid within the system to avoid nip starvation.

Abstract: Flexographic web printing apparatus constructed for continuous web feed and for change-over from printing one impression on the web to printing a succeeding impression on the fly without interrupting the web feed.

Abstract: An undershot inking unit for a printing machine and a method for regulating ink distribution in a printing machine are disclosed. The undershot inking unit comprises an ink fountain roller communicating with an ink fountain, an inking roller, and an intermittent ductor roller for transferring ink from the ink fountain roller to the inking roller. In accordance with the present invention, the ductor roller is thrown onto the ink fountain roller at a rate that is independent of the printing speed of the printing machine, preferably, at a rate that is constant for all printing speeds. The disclosed apparatus and method alleviate the problem of ink fall-off in printing machines.

Abstract: A dampening unit for an offset printing machine having an applicator roller including a central section and two oppositely disposed tapered end sections to prevent the transference of excessive amounts of dampening medium to the printing plate is disclosed. The boundaries between each of the end sections and the central section of the applicator roller are located adjacent predetermined regions defined on the plate cylinder to ensure a uniform dampening medium film is produced across the entire format width of the material to be printed.

Abstract: In a continuous dampening system, an oscillating distributor roller distributes ink/dampening fluid emulsion preferably over the form roller. The drive for causing distributing motion, back and forth along its axis of rotation, of the distributor roller is derived by friction drive to the roller surface and the support shaft of the distributor roller is also rotatably driven through appropriate gearing, thus rotation of the distributor roller is varied along with the rotational speed of the other rollers of the dampener, but the rate of longitudinal oscillation remains relative, since the speed of relative motion between the shaft and distributor roller itself increases or decreases proportionately as the press and dampener speed up and slow down.

Abstract: A method and apparatus for inking a "waterless" planographic printing plate utilizes an ink application unit and a separating agent application unit. These two units supply conventional ink and a separating agent either directly or indirectly to the planographic printing plate.

Abstract: This invention describes a control mechanism for an electric main drive of a printing machine, whereby the electric main drive operates with a motor, a brake and a tachometer generator. The machine control of the control mechanism is connected to a multiplicity of signal transmitters (pushbuttons). The signal transmitters detect the machine state to ensure that the printing machine does not run at an excessively high speed. For this purpose, the invention outlines, in addition to the machine control, a monitoring device which detects the switching states of the signal transmitters, forms a highest possible permitted speed therefrom and compares this value with the actual speed value delivered by the tachometer generator. The electric main drive is shut down as soon as the actual speed value overshoots this upper limit.

Abstract: A chambered doctor blade device intended for a printing unit and adapted to coat a rotatable cylinder (2) with ink, lacquer, adhesive or the like, comprises an elongate frame (8) which is arranged parallel to and outside the cylinder (2) and on which are mounted two parallel, elongate and spaced-apart doctor blades (9,10) to be resiliently and scrapingly applied against the cylinder (2) in operative position. An elongate chamber (11) holding ink (12) or the like is defined by the doctor blades (9,10), the surface of the frame (8) facing the cylinder (2), and the circumferential surface of the cylinder (2). To achieve good flexural and torsional rigidity, the frame (8) comprises at least two elongate interconnected metal sections (13,14) which are made of bent thin sheet-metal, preferably of stainless steel, and by means of which the elongate portion of the frame (8) located between the mounting places for the doctor blades (9,10) forms an elongate stiffening or reinforcing portion.

Abstract: A metering roll for the application of ink or other liquids and a method of fabricating same wherein the metering roll has a core roll securable to journal bearings and rotatable about the journal bearings, the core roll having a non-porous cylindrical sleeve of heat resistant glass secured about it, the non-porous heat resistant glass sleeve having formed on the periphery thereof, ink capturing cells.

Abstract: An ink supply device for a printing apparatus, the ink supply device being positioned within a porous cylindrical drum and including: a frame body having side plates confronting each other; an ink supply roller supported between the side plates by the frame body, a lower portion of the ink supply roller coming in contact with an inner circumferential surface of the cylindrical drum, and the ink supply roller being rotatable about a central axis thereof and in synchronism with the rotation of the cylindrical drum; an ink amount control member supported between the plates by the frame body, and having a predetermined gap with respect to an outer circumferential surface of the ink supply roller while extending along one generatrix of the ink supply roller, wherein the ink amount control member, the ink supply roller and the side plates cooperate to form a space in which ink is pooled; a rodlike member supported between the side plates by the frame body and extending within the space where ink is pooled along the

Abstract: An ink separator (24) in a printing press system (10) having a reservoir (12) for containing dampener solution (14) with a surface (21) and a layer of ink (16) floating on the surface (21) having a pipe (34) within the reservoir (12) with an inlet opening (36) at the surface (21) to drain the dampener solution (14) from the reservoir (12), a member (44) for blocking the entry of ink (16) from the surface (21) into the inlet opening (36) and a passageway (50) extending from beneath the surface (21) to the inlet opening (36) for conveying the dampener solution (14) to the inlet (36).

Abstract: A coupling for a removable cylinder in a rotary printing machine facilitates the removal of the cylinder without disrupting the gear drive wheel for the cylinder. An axially shiftable control shaft is coupled to the cylinder through a switchable coupling. The control shaft drives the cylinder from a hollow shaft through an interlocking coupling. The gear drive wheel is carried by the hollow shaft.

Abstract: A short, multi-color, web-fed rotary printing press for job printing utilizes a vertical stack of bridge printing units which are supported by horizontally shiftable frame sections. The rubber blanket cylinder of each printing unit is at least twice as large as its associated printing cylinder but is always a whole number multiple in size. The printing cylinder in each printing unit rests on the upper half of its associated rubber blanket cylinder.

Abstract: A multi-color offset printing press for the printing and in-line coating of materials is disclosed. The printing press includes an in-line flexographic printing/lacquering unit for applying coating fluids to materials printed in the printing press. The flexographic printing/lacquering unit may be installed upstream of the first printing unit, downstream of the last printing unit or in between printing units.