Abstract: A printing machine comprising a plurality of printing units (3) arranged in line one behind the other and an endless transport belt (4) for substrates to be printed, said transport belt running around, at least, two spaced-apart rollers (5, 6) and past said printing units. At least, two rollers (5, 6) are mounted on a coherent belt-carrying unit (9) from which, when being in a slack condition, said transport belt (4) may be stripped off. Furthermore, the printing machine features a drawer (24) which may be pulled out laterally and which is provided below said belt-carrying unit (9) as well as a holding device (11, 12, 13, 15, 16) holding said belt-carrying unit (9) and being switchable between, at least, two different conditions, in a first condition said holding device holding said belt-carrying unit in an operating position, and in a second condition said belt-carrying unit (9) resting loosely on said drawer (24). This permits a simple and quick belt changing.

Abstract: Apparatus for sheet singling and alignment on a top side of a sheet pile of a rotary printing press includes a suction device extending transversely to sheet transport direction in the vicinity of the leading edge of the sheet pile, the suction device being intermittently activatable with suction air, a scanning device for controlling a lifting motion of the sheet pile, the scanning device extending across the entire width of the pile and having a member movable towards and away from the top side of the pile for scanning the height thereof, swivelable levers adjacent the pile-height scanning member, an element for laterally aligning single sheets of the sheet pile axially displaceably mounted on the swivelable levers, and a device for directing an air stream onto the leading edge of the sheet pile so as to lift off a leading-edge region of the respective single sheets from the pile.

Abstract: A sheet-fed printing press includes a plurality of printing units disposed along a sheet-transport path. A transport apparatus (3, 33, 40, 50, 66, 78) is disposed along the sheet-transport path. The sheets are transported through the printing units along the sheet-transport path and, after recto-printing, they are returned along a return-transport path which extends essentially in an opposite direction to the sheet-transport path. The printing press is thus enabled to print recto-and-verso while having a very short structural length.

Abstract: Paper transport system for printing presses includes a drive roller, a deflection drum disposed in spaced relationship with the drive roller, and a conveyor belt extending around the drive roller and the deflection drum, the conveyor belt having first regions formed with engagement elements, as well as second and substantially smooth-surfaced regions, the drive roller and the deflection drum, respectively, being subdivided into axially separate, respective roller and drum segments rotatable independently of one another and surrounded by the first and the second regions of the conveyor belt, the conveyor belt being of such construction between the first regions and the second regions thereof that small relative movements are possible therebetween in a longitudinal direction of the conveyor belt.

Abstract: Method for supplying a printing unit of a printing press with ink which is solid at normal temperature includes supplying the printing unit with ink in the form of solid bodies, and melting the solid ink bodies in the printing unit and applying the ink in a molten state to a cylinder of the printing unit.

Abstract: A method for creating contact pressure forces between printing substrates conveyed on an endless conveyor belt and multiple ink transfer devices arranged at a distance from one another in tandem along the conveyor belt, the ink transfer devices having respective cylindrically curved surfaces located opposite the conveyor belt. The method includes creating the contact pressure forces through the use of a prestress applied to the conveyor belt, and partially looping the substrates on the curved surfaces of the ink transfer devices with said conveyor belt.

Abstract: A printing press has a plurality of in-line printing units in which substrates are transported along a rectilinear transport path. The printing units include several recto printing units and several verso printing units disposed along the transport path. A transport system, which transports the substrates through the printing units along the straight transport path, includes a first transport apparatus through the recto printing units, and a second transport apparatus through the verso printing units. A feeder assembly feeds the substrates to be printed from a feeder pile to the transport system. The feed by the feeder also follows a straight path which is coplanar with the path through the printing units. It is thus possible to print not only bendable substrates, but also rigid and stiff substrates such as carton, plastic, sheet metal, glass, and the like. The system further includes a turning apparatus for turning the substrates between the recto printing units and the verso printing units.

Abstract: A device for holding substrates on a printing-press transport belt successively transporting the substrates closely past an impression cylinder includes at least one stripping device disposed in an exit part of a nip between the impression cylinder and the transport belt, the at least one stripping device being movable in synchronism with a printing-press cycle towards and away from the impression cylinder; and a method of operating the device.

Abstract: Transfer cylinder with an electromotive drive unit includes a common bearing for a rotor of the electromotive drive unit and for the transfer cylinder, the bearing being disposed in a unit of a printing press supporting the drive unit and the transfer cylinder.

Abstract: A sheet guide in a feeder of a sheet-fed printing press has lateral guide plates for upper sheets of a sheet pile for laterally aligning the upper sheets with one sheet edge, and at least one deformable leaf spring located at a side of the sheet pile opposite to the side thereof at which the aligned sheet edge is disposed and acting by spring force against the upper sheets transversely to a sheet-feeding direction of the upper sheets of the sheet pile, the leaf spring being re-deformable counter to the spring force to behind a surface of the guide plate.

Abstract: A combination of a printing press and a chainless delivery system therefor includes adjustable sheet stops disposed in a horizontal plane, the delivery system being subdivided into a part proximate to the press and a part distal to the press, one of the sheet stops being a rear sheet stop fixedly connected to the distal part of the press, the distal part being adjustable horizontally, together with the rear sheet stop, in a direction towards and away from the printing press.

Abstract: Device for facilitating sheet separation in an upper region of a feeder pile, whereat a separating device is disposed for removing a respective uppermost sheet from the pile and feeding it to a further processing unit, includes a turnable bushing having a guide, and a blower having a vertically adjustable blower body mounted with preloading on the turnable bushing.

Abstract: A synchronizing roller arrangement for transporting sheets into a sheet-processing machine, the synchronizing roller arrangement being mounted on a cyclically rotating shaft and pressable with adjustable contact pressure against a transport roller, and including a rotatably supported element, and a vertically-adjustable element whereon the rotatably supported element is secured.

Abstract: In a sheet-fed printing press, there is provided a device for receiving sheet piles thereon, including a pile table movable up and down, spacers disposed on the pile table, and pile supports of respective sizes corresponding to respective sizes or formats of the sheets disposable on the pile supports, the spacers being distributed over and locally fixed to the pile table so that the respective pile supports of varying sizes rests on a selected number of spacers sufficient for safely supporting the respective pile supports against tilting, the pile supports of respectively smaller size resting on a smaller number of the respective spacers than the pile supports of respectively larger size.

Abstract: Device for facilitating sheet separation or singling in an upper region of a feeder pile, wherein equipment for acting upon an edge of the feeder pile facing away from a processing machine is adjustably movable against lateral edges of the sheet pile, includes a supporting structure disposed above a feeder pile and extending beyond dimensions of a maximally processable format of a printing material and being swivellable out of a plane extending parallel to a top surface of the feeder pile, and elements for facilitating sheet separation carried by said supporting structure.

Abstract: Device for preventing removal of more sheets than a single sheet from the surface of a sheet pile includes fingers distributed on a front stop in vicinity of the surface of the sheet pile along a front side of the sheet pile for separating the sheets in a separating or singling process, at least one bearing member for carrying the fingers, and resilient supports for supporting the bearing member, the resilient supports being adjustable independently of one another with respect to the sheet pile.

Abstract: Sealing device for a dampening unit of an offset printing machine having a dampening-medium applicator roller and a metering roller rolling on one another so that a duct for receiving a supply of dampening medium therein is formed by an upper wedge located between the metering roller and the applicator roller, and having a sealing support bracket mountable on a lateral part of the dampening unit pre-stressed in a direction towards an end face of the rollers, and a sealing element held by the sealing support bracket and sealingly supported radially on the metering roller and sealingly engaging the end face of the dampening-medium applicator roller. A path is defined for swivelling the sealing element into a make-ready position wherein the sealing element is removable from the sealing device, the path being left free by the sealing support bracket so that the sealing element may be turned about the metering roller.

Abstract: A device for actuating lateral sheet guides in accordance with respective sheet format widths to be processed includes an actuator disposed on an operating side of a rotary printing press for displacing a side stop transversely to the longitudinal direction of a sheet, the actuator being disposed so as to be visible and freely accessible on an operating side of a sheet pile, adjustable lateral sheet guides disposed in a feed region and a delivery region of the printing press, mutually cooperating tensioning devices form-lockingly connected to the actuator and to the lateral sheet guides and being simultaneously adjustable by the actuator in the feed region and in the delivery region symmetrically to a center of a printing unit of the printing press.

Abstract: Sheet feeder of a printing press having suckers for seizing an uppermost sheet of a sheet pile at a leading end of the uppermost sheet, at least one sheet-pile stop having an upper edge over which the uppermost sheet is liftable, and a pair of transport rollers to which the uppermost sheet is feedable includes grooves formed in the sheet-pile stop and extending parallel to leading and trailing edges of the sheets on the sheet pile.

Abstract: A method of feeding, aligning and holding a sheet on a cylinder of a sheet-processing machine, which includes, prior to an occurrence of a gripping operation on a sheet at a cylinder of a sheet-processing machine, forcing a leading edge of the sheet into a contact position wherein the leading edge of the sheet is pressed against moving front lays which are guided over the cylinder, opening sheet grippers carried by the cylinder, inserting the leading edge of the sheet which is in the contact position into the sheet grippers, and maintaining the leading edge of the sheet in the contact position with the front lays until just before closing the sheet grippers; and a device for performing the method.