Eastman-kodak Company

Nexpress Solutions, Inc.

Karlheinz Walter Peter

Patrick Metzler

Ingo Klaus Dreher

Christopher B Liston

Heiko Hunold

Rolf Spilz

Gary Alan Kneezel

Matthias Hermann Regelsberger

Stefan Schrader

Jan Dirk Boness

Ralph Petersen

John R Thompson

Robert Michael Peffer

Donald Calvin Buch

Wolfgang Eberhard Luxem

Frank Pierel

Dirk Kahl

Dieter Karl-Heinz Dobberstein

Michael Thomas Dobbertin

Thomas Allen Henderson

Thomas Jacobsen

Matthias Wecker

Volker Otto

Stefan Theden

Matthias Prinz

Norbert Freyer

J&uuml;rgen Sahlmann

Walter Dworschak

Ulrich Schmidt

Sönke Schmidt

Hans-Guenter Staack

Michael Mordhorst

Stephan Walter Pareigis

G&uuml;nther Voss

Rolf Spitz

Michael Kowalczyk

Lutz Michael Wagner

Hans-G&uuml;nter Werner Staack

Gerhard Rudolf Sing

Joachim Heinrich Haupt

Christian Friedrich Engeln

Bernhard G Steuernagel

Nikolai Neefe

Stefan Schlünss

Rolf Johannes Spilz

V Jörg Leyser

An electrophotographic printing system for printing with a set of toners including a white toner. A plurality of printing modules are configured to print respective toner patterns, each including a toner image printed onto a receiver medium being transported on a transparent transport web and a corresponding registration mark positioned outside a border of the receiver medium. A first registration mark sensing system is positioned to detect the registration marks printed with a first subset of the toners that doesn't include the white toner. A second registration mark sensing system is positioned to detect the registration marks printed with a second subset of the toners that includes the white toner. The registration mark sensing systems each include a reflector plate positioned behind the transport web. The reflector plate for the first registration mark sensing system is white, and the reflector plate for the second registration mark sensing system is black.

Registration of white toner in an electrophotographic printer

A printing system including a plurality of printheads for printing on a web of media traveling along a web transport path, at least one of the printheads being configured to print at first and second print lines. A plurality of web transport rollers guide the web of media along the web transport path. At least some of the plurality of web transport rollers are constrained to have a roller circumference that is substantially equal to an integer fraction of a span of the web of media along the web transport path between two successive print locations in successive print heads. A span extension member provides an increased span of the web of media between the first and second print lines in a particular printhead such that the increased span is an integer multiple of the roller circumferences of the constrained web transport rollers.

Printing system with span extension member

A printing system for printing on a web of media traveling along a web transport path, including a plurality of printheads for printing on the web of media, each of the printheads being configured to print at one or more corresponding print locations along the web transport path. A plurality of web transport rollers guide the web of media along the web transport path. Each of the plurality of web transport rollers has a roller circumference that is substantially equal to an integer fraction of a span of the web of media along the web transport path between two successive print locations.

Precision registration in a digital printing system

A printing system for printing on a web of media traveling along a web transport path, including a plurality of printheads for printing on the web of media, each of the printheads being configured to print at one or more corresponding print locations along the web transport path. A plurality of web transport rollers guide the web of media along the web transport path. A drive roller causes the web of media to move along the web transport path. The drive roller has an affixed driven gear driven by a motor using a gear train including one or more drive gears which transfer torque from the motor to the driven gear. The driven gear and the drive gears are constrained to rotate substantially an integer number of times as the web of media is advanced along the web transport path between two successive print locations.

Drive gears providing improved registration in digital printing systems

A method for automatically adapting a write cycle to a movement of a web-shaped medium in a digital printing machine, as a function of the thickness of the web-shaped medium guided around first and second transport or guide rollers, includes providing the first and second transport or guide rollers having a known diameters, the diameter of the second being different from the diameter of the first. A rotational speed ratio N(T) between the first and second transport or guide rollers () is determined while the printing material () is guided around the transport or guide rollers (). The write cycle is determined at least with the use of the previously determined rotational speed ratio N(T).

Method and device for automatically adapting a write cycle in a digital printing machine

A device for controlling substrate web tension includes first and second driving units with respective driving rollers around which the substrate web is partially guided and tensioned. The first and second driving units have different rotational moments of inertia. A measuring unit measures the tension of the substrate web. A control unit has first and a second filtering units with different filtering characteristics for filtering the measured value. The control unit includes a first control device for controlling the first driving unit based on the measured value filtered by the first filtering device, and a second control device for controlling the second driving unit based on the measured value filtered by the second filtering device.

Device and method for controlling the tension of a substrate web

The invention relates to a method and a device for controlling the circumferential register in a digital multi-color printing machine for printing sheets during a printing process, whereby, for each sheet, at least one register mark per color printing unit of the multi-color printing machine is produced, assigned to said sheet and defined with respect to its position, and whereby, based on the determination of the position of the register marks of a sheet, the circumferential register of at least one sheet, which follows the sheet associated with said determined register marks downstream of the printing process, is controlled. In duplex printing a sheet by recto and verso printing with the invention, register marks are applied for each side and, in order to control recto and verso printing of at least one subsequent sheet, said register marks are analyzed.

Method and apparatus for controlling the registration of sheets

The invention relates to a method of ensuring a correct lateral registration setting, in a digital multi-color electrographic sheet-printing machine, which the sheets adhere to a support, preferably a transport belt, are transported past printing units.

Method of ensuring a correct lateral registration setting and printing machine suitable therefor

A device and a method using a printing device and system for printing sheets whereby, for each sheet, at least one register mark per color printing unit of the multi-color printing machine is produced, assigned to said sheet and defined with respect to its position, so that in duplex printing register marks are applied to each side. The position of each mark is determined by analyzing the position of the mark assigned to the appropriate previous recto or verso sheet.

Method and device for controlling registration

A method and control device for determining a register error, whereby at least one register mark is printed and at least one sensor records the register mark, whereby the sheet edge of the sheet is recorded by the sensor, and the register error is determined from the sensor data and the target data.

Method and control device for determining a register error

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

The invention relates to a method and apparatus for minimizing the influence of register differences in multicolor printing, in particular in digital printing processes, register values () in the transport direction (), which are different transversely with respect to this direction being set to a value between the extremes ('). The invention is intended to carry out a development such that the influence of register differences on the image quality can be minimized reliably and to a great extent. This is achieved by a number of individual values of the register values () being measured and an average value (&#x2032;) being determined from these and brought into alignment with the average value (&#x2032;) from at least one further color printing unit (&#x2032;&#x2033;).

Method and apparatus for minimizing the influence of register differences

Device for detecting the location of an edge of a transparent material, web edge control and printing press

The invention relates to a process and a device for alignment of sheet material ( ) which is conveyed in one conveyor plane ( ). The sheet material is conveyed on bodies ( ) of revolution and aligned by means of triggerable alignment elements ( ) in the conveyor direction ( ) and perpendicular to the conveyor direction ( ). The alignment elements ( ) are assigned to an alignment unit ( ). The alignment motion necessary for alignment of the sheet material in the conveyor direction ( ) and perpendicular thereto takes placed by separate alignment elements ( ) which can be triggered independently of one another during conveyance of the sheet material ( ) with the process speed.

Process and device for alignment of sheet material during transport

Correcting register faults in a multicolor printing machine having a number of items of equipment for the digital production of color separations, wherein correction values are determined and assigned to angular positions of at least one image cylinder and, as a result, taken into account for the control of the production of the color separations on the image cylinder. Correction values are to be made available for the correction of register faults, which, with a fine graduation, make it possible to assign them to angular positions of machine elements in a repeatable way. This is achieved by determining circularity errors of machine elements which have an influence on the register, assigned to their angular positions and, from these, the correction values for the control of the production of the color separations on the at least one image cylinder being determined.

Method and apparatus for correcting register faults in a printing machine

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Kiel, Germany

Karlheinz Walter Peter