Heidelberger Druckmaschinen Ag

X-rite Switzerland Gmbh

Gretag-macbeth Ag

Christopher Riegel

Frank Schumann

Wolfgang Geissler

Peter Ehbets

Frank Muth

Loris De Vries

Manfred Schneider

Werner Huber

Michael Kaiser

Robert Lange

Peter Elter

Wolfgang Geißler

An apparatus in a machine for processing printing material has a register sensor for register measurement between at least two color separations of a printed image printed above one another on a printing material. The register sensor registers optically deviations between the two color separations and forwards the deviations onto a computer. The register sensor contains at least one photodiode having at least two quadrants. The largely rectangular evaluation areas of the photodiode are aligned obliquely in relation to the edges of the conveyed printing material. A register mark to be detected by the register sensor has a plurality of wedge-shaped colored areas pointing in a peripheral direction of the printing material, one of the wedge-shaped colored areas being a reference color used as a reference variable and others of the wedge-shaped colored areas being register colors to be controlled. An alternative register mark has a first field for length calibration; a second field having a wedge of a reference color selected as a reference variable; and a third field containing a register color to be controlled. The may also be provided a measuring field formed as a point-symmetrical field exhibiting a color of a color separation as a full tone.

Register mark to be detected by a register sensor

An apparatus in a machine for processing printing material has a register sensor for register measurement between at least two color separations of a printed image printed above one another on a printing material. The register sensor registers optically deviations between two color separations lying one above the other on the printing material and forwards the deviations onto a computer. The apparatus includes register marks to be measured by the apparatus. The apparatus is distinguished in that the register sensor contains at least one photodiode having at least two quadrants, and in that the largely rectangular evaluation areas of the photodiode are aligned obliquely in relation to the edges of the conveyed printing material.

Register sensor

Spectral, densitometric, or color measured values are detected on sheet printing materials during the printing process in a sheet-fed printing press. The measured values are determined on sheets as they are moving through the printing press and the measured values are used in real-time by a computer to control parameters for controlling the printing process in the sheet-fed printing press.

Inline measurement and closed loop control method in printing machines

A printing press for processing sheet printing materials includes at least one printing unit, a computer and a measuring device for monitoring printing quality during a printing process. The measuring device has a sensing device for measuring by color or spectrally to register the printing material. At least one sheet-guiding element leads the sheet printing material past the sensing device. A measuring device for monitoring printing quality during a printing process in a printing press for processing sheet printing materials, is also provided.

Printing press and device for the inline monitoring of printing quality in sheet-fed offset printing presses

Growing community of inventors

Bruchsal, Germany

Christopher Riegel