Abstract: An apparatus for the print throw-on and throw-off of the rubber blanket cylinder in the printing unit of a sheet-fed offset printing machine is described. For the throw-on and throw-off of the rubber blanket cylinder in relation to the impression cylinder and to the plate cylinder, the rubber blanket cylinder is mounted pivotably on both sides in eccentric bearings. The pivoting of the eccentric bearings takes place via two individually switchable actuating means, a print regulation mechanism being connected in series up from the actuating means. The two actuating means act on the eccentric bearings via a ternary member for the pivoting of the eccentric bearings, this arrangement selected in this way making it possible, in the case of larger thicknesses of printing material, to throw off the rubber blanket cylinder only from the plate cylinder. The print throw-off and throw-on thus causes lower torque jolts because of the smaller pivoting travel.

Abstract: A cleaning apparatus for the inking mechanism of an offset printing machine including an ink fountain roller, an ink lifter roller and ink take-off roller associated with an ink roller train wherein the ink lifter roller is journalled for rotation on one end of a lever arm pivotally supported intermediate the ends thereof by an eccentric coupling. A working cylinder and an articulated link rotate the eccentric coupling and move the lever arm and ink lifter roller between a cleaning position, wherein the ink lifter roller simultaneously contacts the ink fountain roller and the ink take-off roller, and a printing position, wherein the lever arm pivots about the eccentric coupling to oscillate the lifter roller between contact with the ink fountain roller and the ink take-off roller.

Abstract: An undershot inking unit and associated method are disclosed. The undershot inking unit includes an ink fountain roller that is controlled independently of the printing speed of the printing machine, and in which the rotational contact angle of the distributor roller on the ink fountain roller is varied according to the printing unit speed. The method comprises controlling the rotational speed of the ink fountain roller independently of the printing speed of the printing machine; and varying the rotational contact angle of the intermittent ductor roller on the ink fountain roller according to the printing speed of the printing machine. In a preferred embodiment, the apparatus includes two coaxial cams rotatably adjustable with respect to each other. Each cam includes a predominant circumferential contour and a subordinate circumferential contour.

Abstract: An undershot inking unit and associated method are disclosed. The undershot inking unit includes an ink fountain roller that is controlled independently of the printing speed of the printing machine, and in which the rotational contact angle of the distributor roller on the ink fountain roller is varied according to the printing unit speed. The method comprises controlling the rotational speed of the ink fountain roller independently of the printing speed of the printing machine; and varying the rotational contact angle of the intermittent ductor roller on the ink fountain roller according to the printing speed of the printing machine. In a preferred embodiment, the apparatus includes two coaxial cams rotatably adjustable with respect to each other. Each cam includes a predominant circumferential contour and a subordinate circumferential contour.

Abstract: A mounting device is provided for an ink duct of a printing press wherein the ink duct is supported primarily on the press frame so as to be pivotally movable with respect to a ductor roller. The ink duct carries a first guide roller which engages the ductor roller in substantially the same plane as the ink metering elements disposed in the ink duct and the ink duct carries a second guide roller which engages the ductor roller substantially vertically above its center line. A link pivoted to the ink duct carries a third guide roller which is normally biased into engagement with the ductor roller at a position disposed from the first guide roller by at least 180.degree. measured peripherally around the ductor roller through the second guide roller. An unlocking mechanism swings the third guide roller out of engagement with the ductor roller so as to permit pivotal movement of the ink duct and guide rollers away from the ductor roller.

Abstract: Adjustment means for engaging, disengaging and adjusting inking and damping rollers are provided in the inking and damping units of offset printing machines. The printing machine includes inking rollers supported on cam rollers which bear on cam discs situated axially parallel to the plate cylinder inside an arcuate housing. The cam discs are interconnected in such manner that they can be adjusted individually and they are also connected to the housing so as to be adjustable jointly. The housing is also pivotally connected to an adjustment drive by means of which it can be moved peripherally relative to the plate cylinder bearing to effectuate the engagement and disengagement position of the inking rollers.

Abstract: A selective drive for a metering roller in a damping unit of an offset printing press which enables the metering roller to be driven by the damping fluid fountain roller without peripheral slip during the joint washing of the damping unit and inking unit. The gearwheel drive producing the peripheral slip can be selectively brought into and out of operation by the meshing of two intermediate gears being interrupted and restored by a lever which carries the metering roller and one intermediate gear being pivoted by an actuating cylinder around the axis of the damping unit fountain or ductor roller.

Abstract: To provide a drive mechanism for axially reciprocating the first roller or the first and second roller of an intermediate roller pair adapted to be selectively associated with the first ink spreader roller of an inking unit or with the final applicator roller of a damping unit of a combined damping and inking unit of an offset printing press, a stroke coupling for the spindle of the first intermediate roller with the first ink spreader roller is provided. This stroke coupling is transmitted to the spindle of the second intermediate roller only when both intermediate rollers are in engagement with the damping roller, whereas in the position in which the second intermediate roller interconnects the damping unit and the inking unit, the spindle of the latter roller is secured axially and separated from the stroke coupling.

Abstract: To enable two intermediate rollers to be selectively associated with a combined damping and inking unit as connecting rollers, or with the applicator roller of the damping unit as a first rider roller and a tandem second rider roller, the spindle of the second intermediate roller is removably received at both ends, a bearing lever pivotable around the axis of the first ink spreader roller. Also, swing levers are pivotally connected, one at each end, to the spindle of the first intermediate roller and each swing lever has guides for guiding the second intermediate roller between its first position as a connecting roller and its second position as a tandem roller laterally below the first intermediate roller and in engagement with the applicator roller of the damping unit.

Abstract: An attachment which can be fitted subsequently to the damping roller of an existing damping unit in order to obviate mottling includes a mounting frame in which tandem distributing rollers are mounted radially of a common damping roller for resilient movement and are driven thereby in the peripheral direction by friction. A coupling member on the frame is adapted to be coupled with or released from an existing bearing lever of the damping unit and a drive mechanism produces axial reciprocation of the frame.

Abstract: A vibrator control is arranged to produce a brief pause or interruption in the movement of a vibrator roller before the vibrator alternately engages with an ink ductor and with a distributing roller wherein the arms of a pair of rocking levers which journal the vibrator roller at both ends are each operatively connected to an oscillating forked lever on alternate sides by means of opposed adjusting screws which cause the rocking levers to bear against one of two resilient abutments disposed opposite one another on the press frame. The adjusting acrews are adjusted so that a gap is alternatiely created between each of them and the rocking lever as the forked lever moves to the center of its oscillating stroke.

Abstract: An intermediate transmission with a variable input-to-output phase relationship for converting rotary motion to reciprocal motion includes a drive shaft having a main portion and an eccentric crank pin, an externally toothed ring with a plurality of circular bores rotatably mounted on the main shaft portion, a control member for rotatably adjusting and locking the ring in selected positions, a disc having an axially extending collar rotatably mounted on the eccentric pin and carrying a plurality of rollers each disposed to roll on the inner surfaces of the respective circular bores, the distance between each roller axis and the respective bore center being equal to the distance between the main shaft axis and the eccentric pin axis, an externally toothed satellite gear mounted on the collar, and an internally toothed sunwheel engaged by the satellite and rotatably mounted in a frame whereby the sunwheel rotates at the reduced integral speed ratio of 1-.sup.Z 2/.sub.

Abstract: A mounting for changing or laterally reciprocatable inking, damping, or like applicator rolls of a printing press, which rolls are driven by a friction roll in engagement therewith. The changing applicator rolls each have their spindles mounted outside of the roll shell for rotational and axial movement in roller locks. Axial travel is limited by a shoulder ring in the roller lock, the ring cooperating with the outer race of a roller bearing which supports the roll spindle for relative rotational movement within the roller lock. Each roller lock also is mounted so as to be axially locatable in different positions for achieving desired axial movement of the applicator roll, or for preventing spreading movement of the applicator roll entirely.

Abstract: A sheet gripper for a rotary press is provided having a hooked gripper finger pivotably connected at its lower end to a clamping element, and a roller disposed upon the gripper finger is biased against the guiding surfaces of a finger support element to ensure smooth changes from open and closed gripper finger positions, substantially without any vibrational motion or displacement resulting in the plane of sheet motion. Preferably, a compression spring is mounted in the clamping element to bias the roller against the gripper support element, the element having a rectilinear guide surface disposed substantially perpendicularly to a retaining surface, and a cam surface which extends upwardly and inclined outwardly from the rectilinear guide surface. Upon oscillation of the gripper shaft, the roller is guided along the rectilinear guide surface and cam surface, thereby defining accurate gripper finger motion.

Abstract: A resilient sheet gripper for a sheet-fed rotary printing press having a gripper shaft to which is secured a pivoting clamping member in resilient relationship with a pivoted gripper finger having adjustable biasing provided by compression spring means, is provided including an adjusting screw mounted in a stop strip, an abutment for contacting the screw mounted for movement around the gripper shaft, a guide pin fixed to the abutment and disposed in a biased conical sleeve in the gripper finger so that the finger can move perpendicular to a gripper support upon closure of the gripper finger.

Abstract: An inking roller for an offset printing machine, through the interior of which a temperature-control medium flows. The roller is formed of aluminum in a barrel shape with journals mounted at both ends. The cross-sections of the plurality of ducts formed in the wall of the barrel result in an optimally uniform surface temperature for the inking roller. On one side of the inking roller the ducts have openings so that the flow and return alternate inside the barrel. The opposite ends of the ducts communicate with openings which establish the counter flow of fluid through the barrel.

Abstract: An inking unit disposed in the ink duct of a printing press includes dispensing elements for regulating the quantity of ink dispensed on the duct roller of the press and includes a plurality of blades disposed on linear adjusters for movement in the plane passing through the longitudinal axis B of the quantity-regulating dispensing elements and the line of contact between the dispensing edge thereof and the duct roller. Each blade is secured to a retaining pin on the adjuster by way of a securing aperture disposed perpendicularly to its bearing surface, and only minimal clearance, which can be very reduced in the direction of movement, is left between the pin and the securing aperture, so that when the ink gap closes, the blade of a dispensing element can automatically be aligned parallel by the dispensing edge bearing on the surface of the duct roller.

Abstract: An ink metering device for the fountain roller of a printing press including a plurality of ink slides in the ink fountain wherein each slide has a metering element of duct width movable by an adjusting screw which is connected to an adjusting pin and biased by a spring toward the fountain roller to produce a metering gap wherein the spring element is supported between a fixed part of the ink fountain and the metering element and a length-equalizing element is provided permitting transmission of an adjusting movement to the adjusting pin such that the lenth-equalizing action is effective only by overcoming the force of the spring element. In the preferred embodiment, the adjusting pin is rigid with the metering element and the other end is screwed into a length-equalizing coupling connected to a selective drive mechanism with the intermediate portion of the pin being supported for axial movement in a guide block.

Abstract: The dampening unit of a rotary printing press is provided with additional transmission components and a swiveling stop mechanism so that the dampening unit can also apply a varnish having an arbitrary viscosity. For applying dampening solution to the plate cylinder (5) of the rotary press, the dampening unit has a fountain roller (13) feeding a transfer roller (15) and an applicator roller (16) which are driven by the press drive. When the dampening unit is used as a varnishing unit, clutches (28, 29) are enabled and disabled so that the transfer roller (15) is driven by a separate drive (17) which rotates the fountain roller (13). The applicator roller (16) is selectively thrown off by pneumatic actuators (32, 35) in such a way that all rollers (14-16) of the dampening unit are connected to each other and can be driven by the separate drive (17). A third position is also defined wherein the applicator roller (16) is also selectively thrown off 5/10 mm from the transfer roller (15).

Abstract: An ink dispensing system for a printing press having an ink trough of a fountain roller and comprising a plurality of radially oriented ink spreader assemblies arranged closely side-by-side to form a substantially continuous metering edge for zonal metering of a film of ink on the fountain roller as it rotates. Each printer assembly includes a bearing member and a dispensing member, the bearing member having a tip of narrow dimension and the dispensing member having a film-forming edge. Each bearing member is biased so that its tip rides in contact with the surface of the roller to establish a positional reference for adjustment of the dispensing member. An adjusting screw mounted on the bearing member and engaging the dispensing member is adapted to retract the dispensing member a small distance rearwardly of the tip of the bearing member to thereby determine the zonal thickness of the ink film formed on the surface of the roller by the dispensing member.