Abstract: A sheet-guiding apparatus for a turning device in a rotary printing machine guides a sheet being printed to prevent smearing. The turning device includes a turning drum and at least one sheet-guiding cylinder. The turning drum and the sheet-guiding cylinder define a sheet transfer region and a sheet transfer path. The sheet-guiding apparatus comprises an air blower means, at least one blower/suction device, and a lower sheet-guiding device. The air blower means, which is arranged upstream of the sheet transfer region, includes a first set of air outlet openings for directing compressed air toward the sheet-guiding cylinder and at least a second air outlet opening for directing compressed air into the transfer region. The blower/suction device, which is disposed within the sheet-bearing surface of the turning drum, communicates with a plurality of openings disposed in the sheet-bearing surface and is coupled to a pneumatic device.

Abstract: A clamping mechanism for frictionally securing together two radially adjacent concentric components of a gear drive wherein an annular clamping disc having concentric inner and outer peripheral edges and a substantially conically shaped convex portion between the edges is partially disposed in an annular recess in one of the gear drive components. Force applying means, such as tensioning bolts, cooperate with circumferentially spaced apertures in the convex portion of the clamping disc and threaded bores in the component to urge the peripheral edges of the clamping disc into frictional engagement with wall portions of the annular recess and with a concentric surface of the radially adjacent gear drive component.

Abstract: A clutch mechanism for releasing a frictional connection in a double gearwheel drive of a sheet-fed rotary press wherein a gearwheel ring is mounted concentrically on and frictionally connected to a main gearwheel by a spring biased annular clamping element, the clutch including an annular actuator mounted on the press in alignment with but normally out of contact with the annular clamping element and the double gearwheel and means for selectively engaging the actuator with the clamping element and causing relative axial displacement thereof to overcome the spring bias and free the gearwheel ring from frictional engagement with the main gearwheel. The actuator may include an annular fluid pressure cylinder, a camming mechanism or an electromagnet for causing the relative axial displacement of the annular clamping element.

Abstract: The elements of an axially-aligning, eccentrically-adjustable, three-ring anti-friction roller bearing are arranged to compensate for inevitable small deformation and bore alignment errors for the journals of blanket cylinders of printing presses. Rows of rolling elements are disposed between the three bearing rings, the outer one of which has an arcuating curved swing surface. For the purposes of increasing the radial rigidity of the anti-friction mounting and for taking radial forces, the roller bearing rows include cylindrical roller bearings. In addition, there are provided, at least at one axial end, ball bearings or cross-roller axial bearings to resist axial forces. The three bearings rings are braced relative to one another axially and/or radially by a lock nut or the like threaded on the journal for urging the inner bearing ring against the bias of a spring engaging a shoulder on the journal on the other side of the bearing.

Abstract: A radially adjustable gearwheel for driving a cylinder of an offset press. The gear rim has a peripheral annular groove opening axially outward and dimensioned to receive a tensioning ring including inner and outer body parts engaging each other along an inclined tapered surface. A plurality of tensioning devices are mounted on the gear rim and act axially on the tensioning ring causing the inclined surfaces of the inner and outer body parts to slide against each other resulting in radial displacement of the outer body part which produces radial deformation of the gear rim.

Abstract: A suction transfer actuation system for a transfer drum of a multi-color sheet-fed rotary printing press for turning successive sheets, by rear-edge turning, during the sheet transfer from one printing unit to another to facilitate printing on the back side of the sheets. A plurality of suction arms are rigidly connected to a hollow suction rocker shaft connected to actuating levers carrying a pair of guide rollers engaging a curved outer guide cam surface on a guide bar mounted on the transfer drum. The suction actuation system is driven by way of a cam rigidly mounted on the press frame engaged by a cam follower roller to oscillate a drive lever coupled by a link to a drive arm on the rocker shaft to rock the suction arms toward and away from the one printing unit under the guiding influence of the guide cam and guide rollers.

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: Sheet pressing means for a multi-color sheet-fed press adapted for both first-side printing and perfecting printing wherein the press includes a press frame and first and second impression cylinders with a sheet-turning cylinder therebetween. The sheet pressing means includes a plurality of hollow air-blowing fingers disposed after the printing zone of the first impression cylinder for directing blown air to press a sheet onto the surface of the first impression cylinder, with the fingers being disposed in substantially equidistant relationship to one another on a support tube which is disposed above the first impression cylinder and substantially parallel to the axis thereof along substantially the entire length of the first impression cylinder.

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: 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 amount of travel and the phase of axial reciprocation for sets of distributing rollers provided on each of at least two inking units of a rotary printing unit are independently adjustable from a central location. For each of the inking units, one eccentric drive adjustable in reciprocating phase and in the stroke or amount of travel is connected to the end portion of an impression cylinder twice the size of associated plate cylinders so that the axial reciprocating movements of the distributing rollers are derived in synchronism with the rotation of the impression cylinder and in a ratio of 1:2 to the rotation of the associated plate cylinders. In one embodiment, a single bolt clamps the two eccentric drives one on top of the other to the end portion of the impression cylinder. In another embodiment, the two eccentrics drives are concentrically arranged in ring-fashion to permit separate clamping and unclamping of each of the four independent adjustments of the amount of travel and phase of reciprocation.

Abstract: A vertically adjustable gripper support mechanism for the grippers of turning drums of perfecting presses wherein the sheet is turned by two correlatively cooperating gripper systems disposed on cam-controlled pivot shafts biased by return springs. An adjusting shaft is disposed concentrically within the pivot shaft and is rotatable by an adjusting wheel, the adjusting shaft being formed with axially spaced recesses corresponding to the number of gripper supports and having a plurality of arcuate adjusting surfaces preferably offset at 60.degree. in the peripheral direction to one another to provide a multistep vertical adjustment to the gripper support.

Abstract: A cam drive is used to drive the auxiliary gripper on a sheet-fed printing machine having a control cam and an auxiliary cam and associated cam followers. In order to use a minimum amount of pages and eliminate any bending moments from the forces between the cams, the control cam and the auxiliary cam are disposed in a common plane on two parallel shafts and the control lever and associated followers are disposed in the same plane between the cams.

Abstract: Apparatus is provided for simple and reliable adjusting of the smoothing means on a storage cylinder of a sheet of set press to adjust the smoothing means relative to the sheet end when the press is selectively changed from first printing to perfecting printing operation. The storage cylinder is mounted on a hollow main shaft in which a hollow intermediate shaft and an adjusting shaft are concentrically mounted. Clamping cams are disposed on the intermediate shaft and act by way of cam followers and expanding finger sleeves to clamp or release the elements which carry the smoothing means on the main shaft. The position of the smoothing means relative to the main shaft is adjusted by way of epicyclic gearing interposed between one end of the adjusting shaft and the hollow main shaft.

Abstract: The turning cylinder and storage cylinder in a perfecting printing press is provided with changeover mechanisms having spring-loaded electromagnetically releasable latches and sensors for detecting latched adjustments. Moreover, a contactless sensor is provided for detecting clamping of the calendering suckers in the storage cylinder even when the cylinder is rotating. Contactless proximity switches determine the correct phase adjustments between the storage cylinder and the turning cylinder for both perfecting and first form printing. An access door and interlock guarantees that the cylinders are turned to a normal position and braked before the access door is opened, and the access door cannot be closed for subsequent printing until changeover has been completed. An indicator array indicates the sequence of adjustments to follow and abnormal conditions.

Abstract: A no-play drive for a printing press in which a main and auxiliary driving gear are both in mesh with a driven gear. The auxiliary driving gear is mounted upon a cylindrical hub formed on the main driving gear. A plurality of axially extending bores are formed in the main driving gear and a plurality of matching conical recesses are provided in the auxiliary driving gear. Balls fitted in the respective bores have associated coil springs for pressing the balls outwardly in the direction of the recesses so that the auxiliary driving gear tends to be forcibly rocked into a detented position with respect to the main driving gear in which the matching bores and recesses are all in respective alignment.

Abstract: A multi-color printing press including a first press unit and a second press unit with a conveyor interposed between them, the conveyor including a sprocket drum cooperating with a transfer drum on the second press unit. A pair of plenums having apertured faces alined with one another are arranged closely adjacent the feed side of the sprocket drum, the plenums being connected to a source of vacuum. The plenums are cammingly coupled to the press drive for axial spreading movement during passage of a sheet so that the faces of the plenums progressively wipe away any longitudinally extending as well as laterally extending wrinkles in the sheet as the sheet becomes progressively supported on the sprocket drum for sequential passage of the sheet in smooth condition and in accurate register via the sprocket and transfer drums, the action of the plenums being effective both in the recto and verso printing modes.