Eastman-kodak Company

Heidelberger Druckmaschinen Ag

Nexpress Solutions, Inc.

Rolf Spilz

Karlheinz Walter Peter

Patrick Metzler

Volker Otto

Dieter Karl-Heinz Dobberstein

Wolfgang Durr

Stefan Theden

Heiko Hunold

Frank Pierel

Thomas Jacobsen

Georg Rossler

Dimitrios Kostudis

Matthias Wecker

Dirk Kahl

J&uuml;rgen Sahlmann

Bernhard A Linke

Ulrich Schmidt

Joerg Von Malottki

Walter Dworschak

Joachim Heinrich Haupt

Gerhard Rudolf Sing

Hans-G&uuml;nter Werner Staack

Juergen Sahlmann

Lutz Michael Wagner

Christoph J Ochmann

Gerog Rossler

Christian Friedrich Engeln

Sheet inverters and methods for inverting sheets are provided that guide longer length receivers through a 180 degree turn while the receivers are being transported along a transport path while reducing the possibility of jams, the extent of sheet stress experienced during inversion and reducing the risk of creating print artifacts.

Sheet inverter and method for inverting a sheet

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

Provided is a device for the alignment of sheets in a printing machine, said device comprising two pairs of rollers for the alignment of the sheets in their advance direction, for the alignment transverse to their advance direction and with respect to skewing, whereby each pair of rollers consists of a driving roller and of a counter-pressure roller. One drive unit is provided for each of the two driving rollers, whereby each of the drive units consists of a motor and a drive shaft linked therewith, whereby the driving rollers are non-torsionally accommodated on respective drive shafts. The driving rollers can be slid in linear direction on their drive shaft, or the respective drive shafts, and thus the driving rollers accommodated thereon, can be linearly shifted with respect to their drive motors.

Method and device for the alignment of sheet-shaped substrates

Color register and/or register errors are detected in a printing machine by using triangles serving as register marks. A first triangle is printed onto a sheet near the leading edge and a second triangle is printed onto a sheet near its trailing edge. The first triangle and the second triangle are detected by a sensor and a displacement of the sheet at right angles to the travel direction of the sheet and/or an angular displacement of the sheet is/are determined.

Method of determining color register and/or register errors in a printing machine

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

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

A cutting-register feedback-control device of a cross-cutter of a rotary printing press for printing on a printing-carrier web, the cross-cutter including a driven cutting cylinder, and the rotary printing press having printing-unit cylinders, drawing devices for the printing-carrier web and positioning devices for adjusting the position of the printing-carrier web, the cutting-register feedback-control device including scanners for scanning markings on the printing-unit cylinders and for scanning the driven cutting cylinder, the scanners being connected to comparison and control circuits operatively connected with the positioning devices for the printing-carrier web so as to effect a correction in a position of the printing-carrier web if there should be an angular deviation between the printing-unit cylinders and the driven cutting cylinder, also being provided are rotary-position sensors, respectively, for the printing-unit cylinders, the drawing devices and the cutting cylinder, and a first control loop for a drive of the drawing devices, the rotary-position sensors for the printing-unit cylinders and for the drawing devices being connected in the first control loop, and a second control loop for a drive of the cutting cylinder formed independently of the first control loop, the rotary-position sensors for the printing-unit cylinders and for the cutting cylinder being connected in the second control loop.

Cutting-register feedback-control device on cross-cutters of rotary

Method for setting the cutting register on a cross-cutting device positioned downline of a web-fed printing press, the position of the cut edges being variable as a function of the position of the printed image on a moving web, includes scanning with a first scanning device located directly after a last printing unit of the web-fed printing press a printed image on a moving web, generating and feeding signals regarding the printed image to a control device, generating signals with an angle sensor connected to web-guiding cylinders of the web-fed printing press, and associating the angle-sensor signals with the printed-image signals in a region between two printed images and storing the signals in the control device, generating signals regarding the printed image with a second scanning device directly before a cross-cutting device in the region between the two printed images, directing the scanning device, as viewed in a transverse direction of the web, at the same line as the first scanning device, periodically generating signals by means of a sensor for the position of the cross-cutting device, feeding the periodically generated signals to the control device and associating them with the signals of the second scanning device, regulating with the aid of the control device the phase between the signals of the first scanning device and the signals of the second scanning device to a fixed value, and transmitting signals from the control device to actuators for setting the cutting register.

Method for setting the cutting register on a cross-cutting device

Growing community of inventors

Gettorf, Germany

Rolf Spilz