Eastman-kodak Company

Nexpress Solutions, Inc.

Heidelberger Druckmaschinen Ag

Wolfgang Eberhard Luxem

Karlheinz Walter Peter

Thomas Zelenka

Holger Runkowske

Eggert Joachim Jung

Andreas Henn

Thomas Wolf

Heiko Hunold

Holger Leonhardt

Ralph Petersen

Tobias M&uuml;ller

Markus Gerstenberger

Dirk Kahl

Sönke Schmidt

Johann Weigert

Rolf Spitz

Recognizing a substrate stock by light-sensitive sensors inside a printing unit, by a sensor that can recognize several ranges of light wavelengths. By separate recognition of various ranges of light wavelengths, a substrate stock is recognized whenever the total reflection capabilities of surface and substrate stock determined across all light wavelengths coincide.

Process and device for recognition of substrate stock by means of light-sensitive sensors

Controlling a sensor mechanism for a printing machine, in which the sensor mechanism in a printing machine detects, in an initial operational mode, at least one mark and the detection of the mark initiates a second operational mode in which the optical density and the color of the mark are detected by the sensor mechanism.

Sensor mechanism for a printing machine

Recognizing a print substrate in the vicinity of a sensor within a printing machine, whereby a change in the capacitance of the system formed by the sensor and a surface of an area in which a print substrate should be recognized, is recognized by the sensor. In this way, print substrates can already be identified on the basis of a dielectric constant that is different from that of air.

Method and device for recognizing an object on a surface

To regulate the gloss on a print material, and avoid excess release oil, the properties of the fusing medium are measured, and the gloss on the print material is determined on the basis of the measured properties of the fusing medium.

Procedure and device for adjusting gloss in print material

Controlling the position accuracy in color printing with an electrophotographic printing device in regard to the register, namely the position accuracy of a printed image on the print substrate, in particular on the printed sheet regarding an edge of the printed sheet and in regard to the gage-pin, namely the position accuracy of the color printouts of the color print in relation to each other. Register and gage-pin position accuracy are executed with one and the same sensor unit, having one light receiver (sensor), which receives light from at least one light emitter. In this way, both of the position accuracy can be checked economically while saving space and in extreme cases, be corrected, preferably using a control fitting.

Technique and device for controlling the position accuracy in color printing

A procedure and device for measuring the thickness of a liquid layer, in particular an oil layer, on the rollers of printing presses. The mass of the liquid layer in the printing press is measured by a measuring device and that the thickness of the liquid layer on the roller be determined on the basis of the measured mass of the liquid layer. The measuring device preferably contains a piezoelectric sensor in a quartz microbalance, which picks up the frequency changes on the basis of the mass applied to the surface or on the basis of changes in the mass and converts them into corresponding masses or mass changes on the basis of the liquid layer. Furthermore, a control device is provided which controls the application of fluid on the roller as a function of the masses or mass changes determined.

Procedure and device for measuring the thickness of a liquid layer on a roller of a printing press

Determining the position of a sheet pile ( ) having faces ( ) and edges ( ) is achieved by at least one defined illumination zone ( &Prime;) produced on the sheet pile ( ) by diverging beams ( ), and at least two boundaries ( &prime;&Prime;&Prime;) of at least one illumination zone ( &Prime;) are detected and used to determine the position of the sheet pile ( ). A device is correspondingly configured with at least one illumination system ( &prime;) and at least one receiver ( &prime;). A positioning system ( ) is additionally fitted with a controller ( ) in order to bring the sheet pile ( ) from the determined actual position ( ) into its desired position ( ).

Method and device for determining the position of an object having faces and edges, and a positioning system

Applying a toner print to a substrate, in particular to a substrate ( ). At least one print ( ) is applied to the substrate. Then, the amount of toner applied to the substrate is measured by a measuring device ( ). Finally, the difference between the actual amount of toner and a desired amount of toner in the print ( ) applied to the substrate is determined, the printing process being influenced on the basis of the deviation in such a way that the difference in the amounts of toner is reduced or at least remains the same during subsequent prints.

Applying and measuring toner in a print on a substrate by a printing machine

A method and device for detecting the position of a transparent conveyor belt including directing light beams ( ) onto the region of an edge ( ) of the conveyor belt, detecting a jump in intensity of the light beam ( ) as a consequence of the partial insertion of the conveyor belt into the beam path ( ) and evaluating the detected jump in intensity in order to determine the position of the conveyor belt, wherein the light beams ( ) are linear polarized light and the beam path ( ) is directed at an angle or irradiation (&agr;) between 40&deg; and 80&deg; of the light ( ) onto the bounding surface ( ) in such a way that a high degree of reflection is achieved and reflected light and non-reflected light is detected.

Method and device for detecting the position of a transparent moving conveyor belt

A device for separating or singling sheets, which have been piled up to form a stack, in a feeder of a sheet-processing machine, having a transport element with a guide edge, includes a device for matching the shape of the guide edge to the contour of the topmost sheet at a front side of the stack, as viewed in a sheet transport direction.

Device for separating sheets piled up so as to form a stack, in a feeder of a sheet-processing machine

A method of controlling a level of printing ink in an ink fountain, including, by the use of an ink metering device, topping off printing ink along an ink fountain roller that dips into the printing ink; by a level sensor, determining signals relating to the actual level along the ink fountain roller, feeding the signals relating to the actual level to a control device; in the control device, comparing the signals fed thereto with signals relating to a desired level; forming actuating signals from the derived comparative signals, for an actuating element in the ink metering device, so that printing ink is topped off along the ink fountain roller in accordance with ink acceptance from the ink fountain; from a container with a limited supply of printing ink, dispensing the printing ink for topping off and, if necessary or desirable, renewing the supply of ink in accordance with ink demand, which further includes, for each measurement location of the level sensor, determining the change in the actual level per unit time, continuously determining the residual amount of printing ink in the container and, whenever the residual amount of printing ink falls below a specific value, removing the residual amount of printing ink from the container and feeding it into the ink fountain in a manner proportional to the change in level per unit time at the respective discharge location.

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Kiel, Germany

Wolfgang Eberhard Luxem