Abstract: A method of operating a sheet-processing machine having a sheet-pile station, a sheet conveyor for feeding sheets to the sheet-pile station and for releasing the sheets thereat during operation, the sheet conveyor defining therebeneath a clearance space extending downwardly with a magnitude depending upon the operating condition of the machine, and a drive operatively connected to the sheet conveyor, which comprises detecting extents of the clearance space in a vertical direction which exceed predeterminable values, and, after the drive has been stopped, forcibly keeping the drive stopped for as long as the vertical extent of the clearance exceeds a predetermined value. In another aspect of the invention, instead of the foregoing last step of the method, there is substituted a step of forcibly reducing to a predetermined value an extent of the clearance that exceeds a predetermined value.

Abstract: A device for manipulating stacks formed of sheets for a rotary printing press by which the sheets are processable in a processing direction in a so-called nonstop operation, the device including an auxiliary stack support having a cantilevered end and being disposed in an operating position thereof so as to catch the sheets from below, and a carrier carrying the auxiliary stack support so that it is displaceable in and counter to the processing direction, includes a bearing carried by the carrier for supporting at an operating level the cantilevered end of the auxiliary stack support disposed in the operating position thereof, the bearing being adjustable between a functional position into which it has been lowered below the operating level and a functional position wherein it supports the cantilevered end at the operating level.

Abstract: Sheet delivery for a sheet-fed printing press having gripper systems arranged on conveyor chains or toothed belts revolvingly guided and driven by guide wheels, the gripper systems being activatable by a locally fixed control member for gripping sheets individually at respective leading edges thereof and for releasing the sheets in vicinity of a sheet pile, and including guideways for slidingly guiding the conveyor chains, includes rollers with roller bearings fastened to the conveyor chains or toothed belts, the rollers, in regions of increased load, being movable into separate roller guides arranged on a frame of the printing press, for transmitting to the printing-press frame forces which act upon the conveyor chains or toothed belts.

Abstract: Device for conveying a stream of sheets to a sheet-processing machine having a conveyor table with endless transport tapes formed with through-holes and drivable around the conveyor table, and a suction box arranged below the conveyor table and connected with an underside of the transport tapes via suction openings formed in the feed table includes three suction chambers formed in the suction box and extending in succession in a sheet transport direction, the suction chambers including a first suction chamber subjectible to underpressure by a first vacuum source, a third suction chamber facing towards the sheet-processing machine, and a second and middle suction chamber subjectible in common with the third suction chamber to underpressure by a second vacuum source.

Abstract: Sheet delivery for a printing press includes a removable sheet stop, and sheet catchers movable into the sheet delivery for catching sheets to be deposited on a sheet pile while the sheets are yet above the sheet pile, for purposes of both removing a sample sheet and inserting an auxiliary pile holder, the sheet catchers being disposed at an outer end of the sheet pile and being introducible with a close spacing from delivery grippers transporting the sheets to be deposited, the sheet stop being removable from the sheet pile for enabling a sample sheet to be taken, and the sheet catchers being bringable into a position therein at least by respective front ends thereof they have a slight spacing from the sheet pile enabling the auxiliary pile holder to be inserted, the surface of the sheet pile being lowerable so that the auxiliary pile holder is insertable between a lower end of the sheet stop and a top surface of the sheet pile.

Abstract: Device for aligning sheets in a sheet-processing machine having a rotatingly driven suction plate disposed in a transport surface and being formed with suction openings collectively forming hole patterns shaped as circular-ring sectors, the suction openings communicating intermittently, at each revolution of the suction plate, with a suction-chamber arrangement situated below the suction plate, the suction-chamber arrangement having two suction-chamber openings disposed on respective diametrics of the suction plate and offset from one another by a defined diametric angle, each of the suction-chamber openings having a radial extent matching a radial extent of the hole pattern respectively associated therewith.

Abstract: An adjusting device has a pneumatically operating piston-cylinder unit pressurizable in an operating function thereof for actuating adjusting elements in a printing press. The piston-cylinder unit includes a cylinder housing formed with a cylinder chamber, a piston displaceable in the cylinder chamber, and an electromagnet for applying an activated holding force to the piston, the piston being subjectible pneumatically to a prepressurizing force in the cylinder chamber opposite to and less than the activated holding force.

Abstract: A device for uniting a residue sheet pile and a main sheet pile into an aggregate sheet pile wherein a lowermost sheet of the residue sheet pile rests upon and uppermost sheet of the main sheet pile includes a displacement device having a drive; and a rake displaceable by the displacement device along a displacement path in a pile slide-in direction from a first to a second position and from the second to the first position in a direction opposite to the slide-in direction. The residue sheet pile is seated with its undermost sheet on the rake in the second position thereof, and the main sheet pile is in engagement with the rake from below with the uppermost sheet thereof, in one phase of the pile uniting process. The rake has traversed the displacement path in the direction from the second to the first position thereof, in a final phase of the pile uniting process.

Abstract: A sheet-jogging device in a delivery of a printing press with a press frame formed of side parts and having drives and a switching element therefor, a sheet-jogging device having at least one sheet-jogger reciprocatingly mounted in one of the side parts of the press frame so as to be adjustable to different sheet formats, and being tiltably supported, together with a bushing, in a lifting direction of a sheet pile so as to act on the switching element, includes a device for supporting the bushing in the one side part so that the supporting device is movable on all sides with respect to the direction of motion of the sheet-jogger, and a device for resiliently pretensioning the bushing into a given position of operation in which it counteracts deviating movements for moving the bushing out of the given position of operation, the switching element being provided for different drives and being actuatable by the deviating movements in different directions.

Abstract: A device for laterally aligning sheets in a printing machine can have a feeding table via which the sheets are stream-fed to front lays, and a corresponding side-pull device for laterally moving the sheets after having been aligned at the front lays. The side-pull device can operate by admitting a suction to the sheets, and when moving heavy sheets, e.g. cardboard, at high machine speeds, a pull roller can supplement the suction air by pressing the sheets onto the side-pull device.

Abstract: A device for uniting a residual and a main pile of sheets in a pile zone of a sheet feeder to form an aggregate pile wherein an uppermost sheet of the main pile has been brought into contact with a lowermost sheet of the residual pile, includes a rake for underpinning and carrying the residual pile during given phases of a process for uniting the piles, the rake having mutually parallel, horizontal lattice bars. Also included are a displacement device for carrying and displacing the rake, horizontally in longitudinal direction of the lattice bars between a first position outside the pile zone and a second position inside the pile zone, wherein the residual pile is underpinned by the rake, a device disposed in the pile zone for supporting respective ends of the lattice bars projecting beyond the residual pile, and a lifting device carrying the displacement device for lowering the rake into a lower position and for raising the rake into an upper position.

Abstract: A sheet feeder includes a first laterally adjustable guide for guiding a vertically displaceable pile table, a second laterally adjustable guide for guiding a vertically displaceable non-stop device, and a device for adjusting the first guide and the second guide in common and for adjusting the first and the second guides relative to one another in a given direction of movement for effecting a lateral alignment.

Abstract: In a delivery section of a sheet-fed printing press convertible between single-sided sheet printing and first-form and perfector printing, a sheet guide is provided formed with a sheet guide surface alterable between conditions wherein the surface is formed with throughholes and the surface is continuous and smooth, and a device for altering the sheet guide surface so that it is formed with throughholes when converting the press from first-form and perfector printing to single-sided sheet printing, and for altering the sheet guide surface so that it is continuous and smooth when converting the press from single-sided sheet printing to first-form and perfector printing.

Abstract: Sheet delivery apparatus at a printing machine. The sheet delivery apparatus comprises a chain conveying system for conveying printed sheets to a delivery pile and a suction roller for decelerating the sheets before being deposited on the pile. A suction chamber, positioned below the chain-conveying system, extends over the width of the sheets and up to the suction roller. In the region of the upper sheet layers of the delivery pile, suction boxes are disposed at four lateral pile surfaces.

Abstract: A device for uniting residual sheet pile and a main sheet pile into an aggregate pile, wherein a lowermost sheet of the residual sheet pile rests on an uppermost sheet of the main sheet pile, includes a pile-carrying plate having a horizontally oriented upper side whereon the residual sheet pile rests with its lowermost sheet prior to a performance of a pile uniting process, the pile-carrying plate having mutually parallel grooves formed on the upper side thereof, an auxiliary carrying device for temporarily carrying the residual sheet pile including an assembly of horizontally disposed and mutually parallel lattice bars fitting into respective cross sections of the grooves formed in said pile-carrying plate and combined into a rake, guide rails whereon said rake is mounted so as to be displaceable in the longitudinal direction of the lattice bars, a stop rail extending transversely to and being displaceable in the longitudinal direction of the lattice bars, the stop rail being formed with penetrations throug

Abstract: A process and an apparatus for prestacking in a sheet feeder of a rotary printing press provided with lateral stack stops, which can be adjusted to the format of the sheet to be printed, the printing press also having an automatic lateral stacking orientation and a stack raising apparatus, which are designed so that they make possible an easy manual prestacking in the sheet feeder by the operator.

Abstract: Device for correcting the register of a sheet-overprint and for compensating for a distorted sheet in a sheet-fed rotary printing machine by deforming the leading edge of the sheet on a travel path thereof before the leading edge enters a printing unit, including an adjustable bending device for bending, in rhythm with a printing cycle of the machine, a support beam extending transversely to the travel path of the sheet and carrying a plurality of mutually adjacent sheet grippers, includes a pregripper device for executing swinging movements about a stationary axis and an axis adjustable into a given position, respectively, the pregripper device including a gripper fly forming the support beam for the sheet grippers, and respective rigid levers supporting the gripper fly at least at both ends thereof on a gripper-fly shaft, the bending device being cooperatively engageable with the pergripper device and being formed of a single adjustable deforming stop disposed substantially midway between the respective end

Abstract: A sheet feeder having an auxiliary pile supporting device for non-stop operation includes a removable auxiliary pile support of given thickness on which an auxiliary pile of sheets are supported above a liftable main sheet pile with which it is joinable. The sheet feeder bar stops disposed in a sheet feeding path of the auxiliary sheet pile and engageable by a leading region of the auxiliary sheet pile as viewed in sheet feeding direction. The sheet feeder further includes a holding device disposed substantially in a plane extending over the width of the sheets and movable under the leading region of the auxiliary pile, when the auxiliary pile support is removed, for permitting leading edges of the sheets in the auxiliary pile to be lowered a distance equal to less than the thickness of the removed auxiliary pile.

Abstract: A swinging gripper apparatus for use in a sheet-processing machine, which includes a rocker arm member having a pivotally mounted first end and a second end which is selectively positionable adjacent the cylinder or adjacent the feed table, a cam segment member having two opposing arcuate camming surfaces provided thereon, apparatus for moving the cam segment member closer to or further away from the pivotally mounted first end of the rocker arm member, at least one gripper member pivotally mounted on the second end of the rocker arm member for pivotal movement with respect thereto, a lever arm extending from the at least one gripper member, and a cam follower member mounted on the lever arm, the cam follower member being positioned between the two opposing arcuate surfaces provided on the cam segment member.

Abstract: A device is provided for aligning leading edges of sheets at adjustable front lays of a feeder wherein the sheets are fed one after the other against the front lays in a conveying direction perpendicular to the leading edges, the front lays being connected to a front-lay shaft so as to be fixed against rotation relative thereto. The front-lay shaft is, in turn, mounted in a first and in a second bearing of the feeder. A swivelling device connected to the front-lay shaft reciprocatingly swivels the front lays about a longitudinal axis of the front-lay shaft. The aligning device includes a bending device for benging the front-lay axis by acting steadily on the front-lay shaft for selectively adjusting the longitudinal axis of the front-lay shaft so that the longitudinal axis has a shape which, respectively, is curved in the conveying direction, curved opposite the conveying direction and rectilinear.