Abstract: A gap seal device includes a housing with a fluid-filled guiding chamber and a multi-part piston that is translationally and/or rotationally moveable in the guiding chamber. The piston separates a high-pressure region from a low-pressure region of the guiding chamber. The piston forms an annular gap having a nominal gap width with an inner wall delimiting the guiding chamber. The piston has a stepped rod, a sleeve, which is slipped over a stepped-down region of the rod and which has a blind hole, and a coupling. The stepped-down region of the rod or in a tube portion of the sleeve includes a stiffness change. A gap width of the annular gap that is reduced compared with the nominal gap width can be set in a region radial to the stiffness change by stress-caused expansion of an outside diameter of the tube portion of the sleeve in accordance with the set stressing force.

Abstract: A method is used for inspecting at least one copy of a printed product. At least one element, which is spatially constant with respect to a fixed reference point and at least one element which is spatially variant with respect to the same fixed reference point are reliably inspected by reference image data being used for a desired-actual value comparison of the at least one spatially variant element. The reference image data takes account of the variable position of the at least one element; i.e. the spatial variance thereof.

Abstract: A method is used for inspecting at least one copy of a printed product. At least one element, which is spatially constant with respect to a fixed reference point and at least one element which is spatially variant with respect to the same fixed reference point are reliably inspected by reference image data being used for a desired-actual value comparison of the at least one spatially variant element. The reference image data takes account of the variable position of the at least one element; i.e. the spatial variance thereof.

Abstract: The plausibility of at least one measured value, that is determined in a printing press, and that includes a density of an ink applied to a stock, is assessed. The stock is conveyed through the printing press and the ink is applied to the stock in several inking zones. A relation is formed between a measured ink density value, which is determined for a specific ink in a selected ink zone, and a measured ink density value determined for the same ink in at least one other inking zone. The measured ink density value for the specific ink in the selected ink zone is rejected as being implausible, and is not used for automatically regulating the ink in the printing press, if the relation between the measured value and the measured value for the same ink in the at least one other inking zone inadmissibly either exceeds or lies below at least one predefined threshold value.

Abstract: The ink in a printing press, in which a stock of material is being printed in an ongoing printing process, is registered. At least one ink is applied to the stock in several inking zones. A measured value, indicating an ink density, is determined for the at least one ink which is being applied to the stock in the printing process and within the printing press. A relation is formed between the measured ink density for a specific ink in a selected ink zone and a measured ink density value determined for the same ink in at least one other inking zone. The relation between the measured ink density values in different inking zones is formed only if the majority of the inking zones of a specific inking unit of the printing press supply one respective measured ink density value for an ink supplied by that inking unit, and when the measured ink density value reaches at least a predetermined fraction of a preset, desired value in the respective inking zone.

Abstract: The ink in a printing press, in which a stock of material is being printed in an ongoing printing process, is registered. At least one ink is applied to the stock in several inking zones. A measured value, indicating an ink density, is determined for the at least one ink which is being applied to the stock in the printing process and within the printing press. A relation is formed between the measured ink density for a specific ink in a selected ink zone and a measured ink density value determined for the same ink in at least one other inking zone. The relation between the measured ink density values in different inking zones is formed only if the majority of the inking zones of a specific inking unit of the printing press supply one respective measured ink density value for an ink supplied by that inking unit, and when the measured ink density value reaches at least a predetermined fraction of a preset, desired value in the respective inking zone.

Abstract: The plausibility of at least one measured value, that is determined in a printing press, and that includes a density of an ink applied to a stock, is assessed. The stock is conveyed through the printing press and the ink is applied to the stock in several inking zones. A relation is formed between a measured ink density value, which is determined for a specific ink in a selected ink zone, and a measured ink density value determined for the same ink in at least one other inking zone. The measured ink density value for the specific ink in the selected ink zone is rejected as being implausible, and is not used for automatically regulating the ink in the printing press, if the relation between the measured value and the measured value for the same ink in the at least one other inking zone inadmissibly either exceeds or lies below at least one predefined threshold value.