Abstract: A printer for optionally printing the front side and back side of a band-shaped recording medium has a feed device to move the recording medium from the front side printing and fixing stations to a turn-overs station where it is turned over and returned to the printing and fixing station to print the back side. Pairs of driven rollers are provided in the paper channel to move the recording medium, wherein the frictional forces on the recording medium by the rollers can be set. The rollers are reversible and can also be swivelled out for certain printing modes and recording media sizes. Automatic threading of the recording medium is provided.

Abstract: A developer station is provided for electrophotographic printer and copier devices, including a developer conveyor means (3) and a developer deflection housing. The developer deflection housing, on whose outside surface developer material is conveyed, has a developer transfer area (2a), at which developer (7) conveyed in by the conveyor means (3) is applied onto the developer deflection housing, and a toner transfer area (2b), which transfers toner to a photoconductor, applied on its surface, the toner transfer area (2b) proceedings complementary to the surface of the photoconductor (4). Further, a magnet rotor (1) is arranged such in the deflection housing that the spacing thereof from the surface of the deflection housing decreases at least up to the toner transfer area (2b) proceeding from the developer transfer area (2a).

Abstract: Filing the documents prepared by a computer (HOST) without a detour via a computer printout, by virtue of the fact that, as in the case of driving a printer, the printing data (SPDS) which can be retrieved via a printer connection interface (CH) of the computer (HOST) is converted into a pixel data stream (PIX-DAT). In parallel therewith text information and bar codes are filtered out of the printing data stream and neutralized and converted into an index data stream (IND-DAT). The two data streams are then logically synchronized and fed to the filing data carrier (ARCHIV). Designing the apparatus as a self-contained apparatus (APALINK) or as a combined apparatus having a printer (PRINTER) and an ancillary device (PC), it also is possible for the ancillary device to be an integral component of the printer. Furthermore, it is possible for the filing to be performed in parallel with printing out or without simultaneous printing out.

Abstract: An electrographic printer has an intermediate medium for simultaneously printing a first web section of an endless medium and a second web section arranged next to and at a distance from the first web section. Both web sections are drawn along a path past the intermediate medium by a transport system. During the printing process, a tensioning device biases the first and second web sections against the intermediate medium. A web-tensioning unit located downstream relative to the direction of transport of the transport device, applies a traction force to the web sections in the direction of travel. In addition, a first compensation device and a second compensation device separated from the first compensation device are provided between the transport device and tensioning device. The compensation devices bias the first or second web sections as appropriate, against the direction of transport during the printing process.

Abstract: The invention relates to a developer station for electrophotographic printing apparatus operating in multicolor simplex and duplex mode and having continuous paper. The developer station contains a plurality of adjacent developer chambers with developer drums and transport drums arranged within. The adjacent developer chambers are separated by partition walls with openings though which the drums pass. The drums driven together are positively connected with each other by coupling elements arranged in the area of the openings and having associated toner-proof seals.

Abstract: The apparatus for conveying finely powdered material from a reservoir includes a suction/pressure unit that projects into the reservoir. A gas is introduced into the suction/pressure unit and is mixed with the finely powdered material that is sucked into suction/pressure unit from the reservoir to form a powder/gas mixture and this mixture is discharged. Compressed air blows into the reservoir in a finely dispersed manner to fluidized the finely powdered material so that the extraction of the finely powdered material from the reservoir is facilitated.

Abstract: A bit configuration stored in a matrix of a grid module is read out to a reproduction device. Wiring outlay is drastically reduced by combining a plurality of memory cells in a matrix cells with only one output and an internal data selection.

Abstract: A controller for an electrographic printer or copier for editing encoded image data by bundling the image data into work packets which are then processed independently of one another. A plurality of raster modules handle individual work packets independently of one another. The raster modules access a resources memory which contains information on fonts and images, for example. A central resources memory unit administers the process.

Abstract: For transporting finely powdered toner material from a reservoir to a delivery opening, a porous bed that forms a down grade is charged with compressed air proceeding from below, whereby the toner material mixes with air to form a liquid-like mixture. This mixture flows along the down grade from the reservoir to the delivery opening.

Abstract: A method for operation of a printing mechanism in an electrographic printer or copier, whereby a charge image is applied at a surface region of a toner image carrier. The surface region provided with the charge image is conveyed past at the transfer surface of a transfer element at a spacing of a developing gap. The actual width of the gap is controlled with a loop control circuit.

Abstract: An optical character generator for an electrographic printer has a plurality of monolithic circuits (11) which are arranged on a carrier (10) and have LEDs (12) which are integrated in the circuits and can be driven individually. The monolithic circuits (11) include a monolithically integrated photodiode drive combination, in the case of which both the associated LEDs (12) and the drive circuit (13), possibly including a BUS circuit (14) for the LEDs (12), are integrated in a monolithic circuit (11). The monolithic circuits are constructed using thin-film technology from III-V semiconductor material, preferably GaAs.

Abstract: A document printing appliance with a paper feed device (E1, E2) processing strip-like recording media (A) of preselectable configuration and having a downstream electrographic printing device (DRU) which can print the strip-like recording media (A) on one side and on both sides, and with a paper post-processing device coupled to the electrographic printing device (DRU) on the output side. Said paper post-processing device has a print-page separating device (V), a buffer store (ZS) for the job-related reception of the separated print pages, and a job finishing device (JF) coupled to the buffer store, for the document-related compilation of print pages extracted from the buffer store (ZS).

Abstract: A turn-over apparatus for a printer for printing on both sides of a web-shaped recording medium has two acutely angled deflectors to turn the recording medium over. The angles of the deflectors are such that the converging ends of the deflectors are spaced apart. Automatic threading of the recording medium is provided.

Abstract: An electrophotographic printer has an electro-thermally operating fixing station (23) with a heated fixing roller (86) and a feed roller (87) which can be pivoted on and away. With the aid of an unheated, pivoting paper guide saddle (93), the reel paper is guided around the fixing roller (86) at a predeterminable wrapping angle (U) for the purpose of preheating before the actual fixing. In order to fix the printed image on the reel paper (12) in an offset-free and smudge-free manner during the starting and stopping process, the movements of the elements of the fixing station (23) and the transport of the paper are coordinated in such a way that there is no relative movement between the fixing roller (86) and toner image on the reel paper (12) when the reel paper is placed against the fixing roller (86) and when the reel paper (12) is stripped off the fixing roller (86).

Abstract: In a printing station, pins for engaging edge perforations of the paper are mounted on a toothed belt. The paper is lifted from a position fully engaged on the pins to a tapered head portion of the pins higher up on the pins to avoid stress on the paper from the pins. Lifting of the paper is provided by a paper guide element.

Abstract: An electrophotographic printing or copying machine contains as image source a laser diode array (10) having a multiplicity of individually excitable laser diodes (11) which are arranged thereon in a predetermined grid for forming an excitation pattern. Furthermore, a deflection unit (13) deflecting the light beams from the laser diode array (10) and imaging optics which are arranged between laser diode array (10) and photoconductor (17) and are configured in such a way that they image the excitation pattern of the image source optically and free of distortion on the photoconductor (17) as an image point pattern.

Abstract: A printing image is transferred onto a first fabric tape (1), which can be wetted with a liquid (19), at a printing image transfer point (3) as a result of the partial evaporation of the included liquid (19). At a subsequent transfer printing point (12), the first fabric tape (1) is located between a heating device (10) and a second fabric tape (4). Printing ink (11) is included in the second fabric tape (4). This printing ink (11) is expelled from the second fabric tape (4) by the liquid (19), which remained in the first fabric tape (1) and represents the printing image and which evaporates at the transfer printing point (12), and is transferred onto a recording medium (9).

Abstract: An electrophotographic process and arrangement for generates a macro-charge zone inkable by toner applicators and delimited by an inking limit (EG) having an adjustable contour on a photoconductor of a printing or copying machine, using at least one exposure-variable and position-variable controllable light source (LED), such as an LED comb or laser. By controlling the exposure of the light source and its radiation position on the photoconductor and by controlling a bias voltage (UB) which can be applied between photoconductor and toner applicator, an electrostatic potential relief (UR) made up of individual adjacent micro-charge zones (UM) of exposure-dependent size is generated on the photoconductor and the inking limit (EG) is defined, the contour of the inking limit being determined by the bias voltage level (UB) on the potential relief (UR).

Abstract: A printing drum (10) contains printing elements (30). These printing elements (30) are each designed as a depression in the surface of the printing drum (10). The printing elements (30) are arranged in the manner of matrix rows. A printing drum (10) has more than one matrix row (33) of printing elements (30). Each printing element (30) contains a selectively activatable heating device (31) which is capable of heating ink (13) contained in the printing element (30), in such a way that, utilizing a gas bubble formed at the same time, the ink is ejected out of the printing element (30) in the direction of a recording medium (14). The printing elements (30) are filled with ink (13) in an inking station (11).

Abstract: In a thermal fixing system for fixing toner images on the front side of a recording medium in an electrographic printer or copier device, wherein the back side of the recording medium can already have a fixed toner image. The thermal fixing means contains a heat transfer fixing station that fixes the toner images on the recording medium, and contains a pre-heating saddle that precedes the heat transfer fixing station in a running direction of the recording medium. A sliding surface that accepts the recording medium over its back side is allocated to the pre-heating saddle. The sliding surface is constructed of a toner-repellant material at least in a contact region with the recording medium. The preheating saddle is designed as a low temperature saddle with the largest possible constructional length, so that a temperature difference between recording substrate and saddle surface is as small as possible. The preheating saddle has, in the recording substrate running direction, a plurality of heating zones.