Abstract: A printing press has a conveying path for a paper web formed by rollers and has at least one high performance printing unit arranged at the conveying path, a plurality of ink jets or multi-color printing units being arranged along the conveying path at intervals in a row and a paper web intermediate store is located in the conveying path preceding each of the ink jet or multi-color printing units, as viewed in the paper conveying direction.

Abstract: A printing device, in particular a printer or a copier, and method for its operation which includes a first electrographic printing unit for printing an image pattern on a sheet-type material in a first transfer printing transport path as well as a second electrographic printing unit for printing an image pattern on a sheet-type material in a second transfer printing transport path, and further including an input section via which the sheet-type material can be supplied individually one after the other to both the first and second electrographic printing units, and further having an output section via which the printed sheet-type material from either the first or second electrographic printing units is ejected individually one after the other. The first and second printing units are in first and second transfer printing transport paths that are connected by connecting paths that form first and second rings.

Abstract: A printing press has a conveying path for a paper web formed by rollers and has at least one high performance printing unit arranged at the conveying path, a plurality of ink jets or multi-color printing units being arranged along the conveying path at intervals in a row and a paper web intermediate store is located in the conveying path preceding each of the ink jet or multi-color printing units, as viewed in the paper conveying direction.

Abstract: The invention relates to a sheet-fed printing press which includes at least one high performance printing unit, especially a laser printing unit, and several ink jet printing units which are each situated on one of several parallel sheet conveying channels. The sheet conveying channels being connected to a shared input channel on the input side via sheet guides and to several sheet temporary storage devices on the output side. The sheet temporary storage devices are connected in turn to a shared sheet output channel on the output side. The at least one high-performance printing unit is connected to the shared sheet input channel of the ink jet printing units or to the shared sheet output channel of the sheet temporary storage device. The inventive sheet-fed printing press enable quick, problem-free and economical multicolor printing and is simple and economical to produce.

Abstract: A printer or copier has a paper feeder provided with a plurality of compartments which hold paper for feeding the paper to the printer and a circuit to control conveying of the paper to the printer. The paper feeder includes a drive to move the paper from the paper compartments to a conveying path where it is carried to the printer. A branching portion is provided in the conveying path. Further paper feeders may be connected in series to the first paper feeder, each paper feeder having a plurality of paper compartments and feeding the paper out of a lower paper feed path to the next paper feeder device.

Abstract: A printing device, in particular a printer or a copier, which includes a first electrographic printing unit for printing an image pattern on a sheet-type material in a first transfer printing transport path as well as a second electrographic printing unit for printing an image pattern on a sheet-type material in a second transfer printing transport path, and further including an input section via which the sheet-type material can be supplied individually one after the other to both the first and second electrographic printing units, and further having an output section via which the printed sheet-type material from either the first or second electrographic printing units is ejected individually one after the other.

Abstract: An active switching mechanism is used for diverting paper sheets from a first area (A) to either possible paths (ab or ac). The sheets along the first path (ab) can be directly conveyed to a second area (B), and the sheets along the second path (ac) can be directed through a passive switching mechanism (4) to a third area (C), the direction of the moving sheets being reversed through a reversing mechanism, thereby enabling said sheets to be conveyed in the reverse direction from the third area (C) along a third path (cb) to the second area (B), using a passive switching device (4).

Abstract: A method for operating a printer or copier is disclosed.

Abstract: A print head for a printer is constructed as an optical character generator and comprises a plurality of switch cells arranged in a two-dimensional field. The energy output by radiation source is transmitted in parallel onto the matrix dots arranged in a grid and these matrix dots lie in the plane of an ink layer on a band-shaped continuous carrier. Each of the switch cells comprises an optical switch element composed of a transparent ferro-electric ceramic substrate composed of lead, zirconate titanate doped with lanthanum and having transparent electrodes for applying a pulse-shaped controlled voltage. In response to a corresponding control voltage, the radiant energy is transmitted frm the switch element into the allocated matrix dot, for example, for a local melting of the ink layer on the carrier, which was coated with a thermo plastic printing ink having a low melting point. The printing arrangement is suitable for line printers having single colors or multiple color printing.

Abstract: In the cleaning station of an electrophotographic printer, the stripper element is driven with the assistance of a cable roller arranged outside of a stripping chamber. The cable roller arranged in alignment with the through openings for the traction cable comprises guide grooves for the traction cable on its generated surface, these guide grooves proceeding left-hand or right-hand in a plurality of spirals or turns. Via a thread, the cable roller is arranged on a stationary rotational axis which has the same characteristic as the guide grooves in terms of direction and pitch or slope. As a result thereof, the traction cable is conducted on a straight line through the seals of the stripping chamber at a constant angle given movement of the cable roller.

Abstract: A laser printing system for multi-color and verso printing is formed of a plurality of units arranged in series which are simultaneously operated. A recording medium emerging from a paper exit region of a preceding unit is supplied to a paper entry region of the following unit. A switchable deflection means for the paper web is disposed in at least one of or between the units. The individual units can thus be constructed of individual fixing modules and printer modules which can be combined with one another. At least one fixing module follows a plurality of printer modules.

Abstract: A stacking device for pre-folded endless paper web in a paper stacker is provided with a stationary stack support or deposit surface and a piler means disposed for movement over the deposit surface for receiving and folding the paper web along its crease lines in zig-zag layers on the paper stack. The invention offers the advantage that the movable elements of the paper stacker have significantly lighter and constant masses, so that the inventive structure may be made less expensively than conventional, known paper stacker arrangements. Between the feed roll means delivering the paper web into the stacker and the relatively movable piler, there is provided a guidance means for conducting the paper web in non-collapsing fashion downwardly within the stacker to the piler. The guidance means is constructed so as to automatically vary in length in accordance with the changing working height of the piler during stacking operation.

Abstract: A central drive system for a nonmechanical printing or copying device such as a photocopier has a central drive system with one motor which is subdivided into a main drive system with high precision for driving elements requiring a high degree of synchronization and a subsystem with less precision for driving elements requiring a lesser degree of synchronization. The main drive system drives the photoconductor drum, the slide scanning roller and a feed crawler in the paper transport unit. The subsystem drives a cleaning brush, the developer roller and mixing screws in the developer station.

Abstract: A pressure device for applying pressure to a web-like image-receiving material, such as a continuous paper web in the transfer station of a non-mechanical printer or copier, has a C-shaped pressure bar which extends over the width of the image-receiving material and is open on a side adjacent to the image-receiving material and which is pivotable about a point disposed above the pressure bar, and a solenoid having a movable plunger which is connected via a linkage to a pin carried on the rear of the pressure plate such that when the solenoid is in a normal rest condition the pressure bar is forced against the image-receiving material such that the image-receiving material presses against the surface of a rotating intermediate image carrier having an electrostatically held toner image thereon for transferring the image to the image-receiving material.

Abstract: For the development of charge images on photoelectric carriers, a developer mixture is used which is comprised of carrier particles and toner particles. In order to prevent excessive aging of this developer mixture, the developer station is constantly supplied with fresh developer and used developer is constantly removed in the same quantity. The quantity of the developer which is supplied to or removed from the developer station is determined with the help of dosing devices. These can include a rotary element with a bore hole. The bore hole is filled with developer and, after rotation of the element by 180.degree., it is again emptied. The rotational speed of the rotary element and the size of the bore hole determine the quantity of developer which is supplied to the developer station or, respectively, is removed therefrom.

Abstract: A fixing device in a printing or copying means which fixes a toner applied to a data-carrier, i.e., a paper web, via a solvent comprising an azeotropic mixture, such as one consisting of 50.5 weight % of C.sub.2 Cl.sub.3 F.sub.3 and 49.5 weight % of CH.sub.2 Cl.sub.2.

Abstract: A printing device in which solvent dissolved toner is applied to a recording carrier to produce a symbol or image wherein a printing head is received interior of a housing with toner particles circulated in the housing in a gas stream. Solvent ejectors within the print head are positioned adjacent a slot opening of the housing and direct a toner-solvent stream against a recording carrier exterior of the housing.