Heidelberger Druckmaschinen Ag

Tobias Muller

Holger Leonhardt

Jurgen Deschner

Roland Pudimat

Eckhard Kobler

Klaus Bahr

Method of scanning register marks produced in multicolor printing which includes generating signals by means of at least one photoelectric receiver from register marks which are applied, respectively, in one color, in a register mark track on a print carrier transportable past the receiver, the register marks differing sharply in contrast with the ink on the ink carrier, determining in a circuit arrangement amplitudes of the signals from the register marks, and bringing a filter arrangement into a radiation path between a light source and the receiver for contrast matching, further includes automatically bringing one defined color filter of the filter arrangement into the radiation path and, after scanning at least one group of register marks wherein all of the colors present in the print are contained, determining a scattering of intensity maxima of the signals generated from the register marks of the one group of register marks, the defined color filter automatically brought into the radiation path having a capability of producing a minimal scattering of the intensity maxima of signals generated by scanning register marks of at least another group of register marks succeeding the one group of register marks.

Method of scanning register marks produced in multicolor printing

Generally, the present invention relates to a fluid container in a unit of a printing machine, comprising a device filling a fluid container with fluid, the device being mounted on a carriage so as to be movable to and fro in longitudinal direction of the fluid container, and comprising a device monitoring the fluid level in the fluid container by means of sensors being fastened to the carriage.

Printing press

Ink-jet printer includes a device for supplying ink, an ink-jet generating device connected thereto, the ink-jet generating device having at least one nozzle for selectively applying ink to a recording carrier or a print transferring material and being positionable relative to the recording carrier or the print transferring material, and a control device to which the ink-jet generating device is connected, the ink-supplying device having at least one mixing chamber for inks of different colors, the mixing chamber having ink inlet channels thereto formed with respective inlet openings, and respective metering devices for the inlet openings disposed in the ink inlet channels, the metering devices being connected to the control device and being actuatable thereby; and method of operation.

Ink-jet printing device and method

A color-matching apparatus for visual on-light evaluation of flexible copies includes a support for at least one copy having a supporting surface being concave as viewed by an observer. An areally radiating illumination configuration emits light of a defined type onto copies and generates a defined intensity of illumination in the supporting surface. The illumination configuration has a radiating surface being substantially convex, as viewed by the observer.

Color-matching apparatus for the visual on-light evaluation of flexible

A method for positioning a register mark sensor in a sheet printing machine, wherein a register mark sensor is moved in direction perpendicular to the direction of the movement of the sheet for detecting a register mark arrangement on the sheet, wherein the register mark sensor is moved until it is positioned in a defined scanning position relative to the register mark arrangement, the method of which includes the steps of: placing on the sheet a preliminary register mark, a given known distance A, perpendicular to the direction of the movement of the sheet, from a given register mark line, and after printing at least one sheet, positioning the preliminary mark sensor in relation to the preliminary mark.

Growing community of inventors

Hirschberg, Germany

Tobias Muller