Abstract: A printing machine that has a plurality of form cylinders and in which an imaging device images at least two of the form cylinders. The imaging device is arranged in stationary fashion. Laser pulses are deflected onto the form cylinders by light diversion components.

Abstract: A method and an apparatus for cleaning a rotating cylinder of a rotary printing machine. The apparatus having a washing device, including a washing brush, roller, or cloth, which can be engaged and disengaged from the rotating cylinder to be cleaned. The washing brush roller or cloth can be sprayed with a cleaning fluid (detergent, water) as well as both water. The method and apparatus ensure a controlled guiding of the detergent onto the outer surface of the rotating cylinder, which guarantees an effective cleaning and, at the end of the washing operation, leaves a relatively dry outer surface of the rotating cylinder. The cleaning method is intended to be suitable, in particular, for detergents having a biological base, for example, esters of vegetable oil.

Abstract: A method and an apparatus for cleaning a rotating cylinder of a rotary printing machine. The apparatus having a washing device, including a washing brush, roller, or cloth, which can be engaged and disengaged from the rotating cylinder to be cleaned. The washing brush roller or cloth can be sprayed with a cleaning fluid (detergent, water) as well as both water. The method and apparatus ensure a controlled guiding of the detergent onto the outer surface of the rotating cylinder, which guarantees an effective cleaning and, at the end of the washing operation, leaves a relatively dry outer surface of the rotating cylinder. The cleaning method is intended to be suitable, in particular, for detergents having a biological base, for example, esters of vegetable oil.

Abstract: A sheet-conveying drum for use between units in a printing machine is provided with a plurality of gripper bridges arranged substantially circumferentially symmetrically on the drum surface. The gripper bridges hold the paper to the drum and include gripper impact strips that are adjustable radially relative to the drum in order to accommodate printing materials of different thickness. Each gripper impact strip is adjusted by means of a positioning device that is arranged on the drum radially inward of the gripper impact strip and mounted so that it can move axially relative to the drum and cam the gripper impact strip radially. The axial movement of each positioning device is brought about by an actuating device which is preferably a pneumatic cylinder and is disposed on the body of the drum at the free end of each positioning device. An energy supply sequentially actuates each actuating device resulting in the piston of each cylinder either extending or retracting.

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: A throw-on and throw-off device for a blanket cylinder in the printing unit of an offset press is provided wherein two parallel double-acting fluid pressure cylinders connected to the blanket cylinder via a toggle-like linkage can be individually supplied with compressed air either consecutively or simultaneously so that, in the first case, precise sequential throw-on of the blanket cylinder on the plate cylinder and subsequently on the impression cylinder can be achieved and, in the latter case, there can be a very rapid throw-off of the blanket cylinder from both the impression cylinder and the plate cylinder. Compressed air energization of the two pressure cylinders is triggered by a control unit in accordance with the position of grip edge zones of the blanket, plate and impression cylinders being in registration.

Abstract: A sheet-conveying drum for skew register correction in multicolor printing that does not affect the drive in sheet-fed rotary presses. The sheet-conveying drum comprises gripper bars and support or carrying webs that are disposed on a drum shaft. The web disposed nearest the drive input has on its flange an arcuate bearing surface around which the drum body can be skewed relatively to the drum shaft. The web disposed opposite the drive input is coupled to an adjusting eccentric bushing by way of a flange to cause the drum to skew. The movements of drum skewing do not adversely affect the drive and, therefore, the transmission ratios of the sheet-guiding cylinders relative to one another.

Abstract: A throw-on and throw-off device for a blanket cylinder in the printing unit of an offset press is provided wherein the blanket cylinder is mounted at both its ends in eccentric bushings and the pivoting throw-on/throw-off movement of the bushings is produced by a toggle-like linkage. Two parallel double-acting fluid pressure cylinders are connected by way of their piston rods to a cross link which is pivoted to one of the links of the toggle linkage. The two pressure cylinders can be individually supplied with compressed air either consecutively or simultaneously so that, in the first case, precise sequential throw-on of the blanket cylinder on the plate cylinder and subsequently on the impression cylinder can be achieved and, in the latter case, there can be a very rapid throw-off of the blanket cylinder from both the impression cylinder and the plate cylinder.

Abstract: A radially adjustable gearwheel for driving a cylinder of an offset press. The gear rim has three axially disposed tapered bores into which axially tapered bolts can be pressed to act radially on the gear rim. Additional axial bores are provided between the tapered bores to form expansion webs in the gear rim. The tapered bolts, in conjunction with the expansion webs, subject the gear rim to varying radial deformation in a gently rising parabolic curve depending on the tension applied to the tapered bolts so that the deformed gearwheel rolls with minimal impact and shock forces.

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: An arrangement for the accurately positioned quick-action clamping and tensioning of printing plates on a plate cylinder (1). Clamping tools (14) are disposed in frame walls (2) and, after appropriate positioning of the plate cylinder, are engageable in coupling sleeves (12) on camshafts (4.3, 5.3) of front and rear tensioning bars (4, 5) by the application of pressure medium (15, 16, 17, 18). Clamping and unclamping is then effected by turning the clamping tools (14) via levers (20) and compressed air cylinders (23). A compressed air motor (25) is disposed in the cylinder gap (3) for tensioning purposes.

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: A device for cleaning the working surfaces of a plurality of cylinders in a printing press is provided wherein a plurality of pressing elements are disposed each for selective engagement with the working surface of at least one of the cylinders and a web of cleaning cloth is disposed to move successively over the pressing elements and is selectively urged by the pressing elements into relative rubbing contact with the working surfaces of at least two of the cylinders. A drive for stepwise advancing and arresting the movement of the cleaning cloth with respect to the pressing elements and the working surfaces of the cylinders includes a clean cloth spindle disposed transverse to the stepwise movement for supplying said web of cleaning cloth and a stepwise drivable dirty cloth spindle disposed parallel to the clean cloth spindle and adapted to receive the used cleaning cloth.

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 sheet transfer drum for a recto and verso printing press having a two-piece section device, each piece being mounted on a diagonal slide, the slides being angled in opposite directions, so that the two pieces hold the two corners of the trailing edge of the sheet and stretch the corners in opposite axial directions as well as the circumferential direction of the sheet transfer drum. The stretching of the sheet is synchronized to the rotation of the transfer drum and effected by a control cam cooperating with a cam fixed to the printing press frame. The suction of the suction device is synchronized to rotation of the transfer drum by a commuting air connection between the suction device and a source of suction external to the press frame. The suction device is also adjustably mounted to the shaft of the transfer drum so that sheets of various length may be stretched.

Abstract: A device the for in-register transfer of sheets and for the conveyance thereof between the printing units of a multi-color press by means of gripper carriages that move on rails and which are driven by an endless chain and which are aligned on the delivery and feed cylinders by rotating drive forks and that cooperate with a cam roller carried by the carriage. For joint axial and radial alignment with quiet entry the drive fork has leading and trailing flanks of different thicknesses and the flanks are guided into engagement with the cam roller by hardened guide plates in the gripper carriage. The leading flank is undersized and the second flank has the dimension necessary for establishing proper registration of the carriage.

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.