Oce Printing Systems Gmbh

Ralph Dorfner

Thomas Schwarz-Kock

In a method or device to control at least one property of a print image printed on a substrate, a first evaluation period is defined. A measurement value is determined with aid of an optical sensor which measures at least one determination point on the substrate within the first evaluation period, and also determining a position of the determination point within the first evaluation period. The determined measurement value is compared with a preset reference value. Depending on a result of the comparison, an inking of the substrate is controlled for the print image in at least one subsequent second evaluation period at a point within the second evaluation period which has a position within the second evaluation period that corresponds to said position of the determination point in said first evaluation period.

Method and apparatus for regulating a property of an image printed on a support material

In a method or system to set a dot size of toner images, at least one latent raster image is generated that is not to be inked with toner particles in at least one region to form a first toner image. At least one additional latent raster image is generated that is to be inked with toner particles over its entire surface, the additional latent raster image being inked with toner particles to form an additional toner image. With a sensor unit a first toner particle quantity is determined which is used to ink at least one toner image and a second toner particle quantity is determined which is used to ink the at least one additional toner image. A ratio of the first toner particle quantity and the second toner particle quantity is determined. The determined ratio is used as a measure representing a real value for an areal coverage of the first toner image and the real value is compared with a desired value. An electrical field is set, depending on a result of the comparison, to transfer toner particles to regions of the at least one latent raster image that are to be inked.

Method and arrangement for setting the dot size of printed images generated with the aid of an electrographic printing or copying system

In a method or system for processing a measurement signal for detecting a property of a toner mark, the toner mark is produced and detected. A measurement signal is output, a signal curve of the measurement signal being determined. A temporal measurement window is provided for detecting a property of the toner mark, the temporal measurement window having a beginning and an end. A plausibility check is carried out of the determined signal curve wherein a maximum value and a minimum value of the signal curve are determined, a first difference value between a maximum value and the minimum value is determined, a first temporal distance is determined between an occurrence of the maximum value and an occurrence of the minimum value, a second temporal distance is determined between at least one of the beginning and end of the measurement window and the occurrence of at least one of the maximum value and the minimum value, and a second difference value is determined between a first distance of the maximum value from a reference value and a second distance of the minimum value from the reference value, and the second determined difference value is compared to at least one of a defined minimum difference value and a defined maximum difference value.

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Oberding, Germany

Ralph Dorfner