Abstract: A printing system for printing on recording media first by a first printer and then by a second printer provides that print data is supplied in a page by page manner to the first and second printers from a print data source. Page information is sent to the printers using the print data and corresponding page information is sent to a buffer storage by the first printer. The page information in the buffer storage and the page information sent to the second printer are verified in a page by page manner by determining adherence to a predetermined rule. A synchronization mark is generated on the recording media by the first printer and is read by the second printer, which is used to control the printing process.

Abstract: A method and device to control a paper drive mechanism of an electrographic printer or copier by friction feed. Optical markings are provided on the recording medium, and a sensor scans an area of the recording medium for the optical marking during transport of the recording medium. An evaluation device evaluates the signals from the sensor for two successive markings corresponding to page length. High speed conveyance of the recording medium is controlled according to page length identified by the evaluation device.

Abstract: A printer or copier has a transfer printing station for electrostatic transfer of toner from a photoconductor to the recording medium. A pressure contact element is provided on the recording medium guide elements to ensure contact of the recording medium with the photoconductor during transfer. Supporting rollers of a slightly greater diameter than the pressure contact element are provided at each end thereof bearing on the photoconductor as spacer elements to define a minimum spacing between the pressure contact element and the intermediate carrier. The contact pressure element(s) may also be mounted on pivotable levers movable by an eccentric.

Abstract: A transfer station for an electrographic printer that can be operated in tandem mode for both-sided printing of an elongate recording medium contains a pressure element in the transfer region, the pressure element resiliently pressing the recording medium against the photoconductive drum over its width at least during the transfer process and thereby compensating irregularities of the recording medium. It is constructed multilayer of a plastic foil having a metal foil arranged thereon, this serving the purpose of picking up and eliminating electrostatic charges that occur in the contact region with the recording medium. The caries effect in transfer printing is thereby prevented. The pressure element is replaceably arranged in a holder as a wear part.

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: A device for controlling evaporation of a liquid has a container and a heating element for heating and evaporating liquid in the container. The container is disposed on a base plate which is supported by a leaf spring which allows the base plate to move between two microswitches depending upon the amount of liquid in the container. The microswitches are connected to a control circuit for activating the heating element and interrupt the flow of power to the heating element when little or no liquid is present in the container, or when a maximum amount of liquid is present in the container.