Abstract: A printing device may include two printers for printing to the front side and the back side of a recording medium. The physical page length of at least one print image applied onto the front side of the recording medium is determined. The required page length of at least one print image to be applied onto the back side of the recording medium is adapted to the determined page length. At least one print line of the print image for the back side is printed repeatedly if the required page length for application of the rear print page onto the back side of the recording medium is smaller than the determined page length.

Abstract: In the print data for a nozzle of a printer, white dots are replaced by pre-ejection pulses. One or more repetitions of the pre-ejection pulses may be inserted into the print data, depending on the actual print speed of the printer, to determine print speed-dependent print data with which the nozzle is activated to print a print image with high print quality.

Abstract: A controller for a print head of an inkjet printing device is described that is configured to generate a virtual timing signal during a printing pause of the printing device, and to use the virtual timing signal for the generation of pre-ejection pulses in order to produce a reliable regeneration of the nozzles of the print head during the printing pause.

Abstract: A printing device may include two printers for printing to the front side and the back side of a recording medium. The physical page length of at least one print image applied onto the front side of the recording medium is determined. The required page length of at least one print image to be applied onto the back side of the recording medium is adapted to the determined page length. At least one print line of the print image for the back side is printed repeatedly if the required page length for application of the rear print page onto the back side of the recording medium is smaller than the determined page length.

Abstract: In the print data for a nozzle of a printer, white dots are replaced by pre-ejection pulses. One or more repetitions of the pre-ejection pulses may be inserted into the print data, depending on the actual print speed of the printer, to determine print speed-dependent print data with which the nozzle is activated to print a print image with high print quality.

Abstract: In a method for printing recording media successively supplied to a printing unit, and wherein a sheet gap is provided from a preceding recording medium, document print data are subjected to a rastering process. A predetermined nominal number of lines is respectively provided for the document print data of a page. The raster print data are successively stored line by line in a print data memory region of an electronic memory. A blank line memory region for a blank line that is not to be filled with print data is provided in the memory. The raster print data are successively read out per line from the print data memory region of the memory and are supplied to the printing unit. After the read out of the nominal number of lines from the print data memory region, the blank line memory region is then read out a number of times, said number of times being a whole number greater than or equal to zero and being dependent on the sheet gap.

Abstract: In a printing system or method a first printing apparatus and a second printing apparatus are respectively selectively operable in simplex mode and duplex mode. Each of the printing apparatuses in simplex mode process print jobs independently of the respective other printing apparatus, and in duplex mode processing print jobs jointly by both of the printing apparatuses. The printing apparatuses are connected with one another for control at least in duplex mode. An activation operating unit is provided via which at least one of the two printing apparatuses is selectively activated for the simplex mode or both of the printing apparatuses are selectively activated for the duplex mode.

Abstract: In a method for printing recording media successively supplied to a printing unit, and wherein a sheet gap is provided from a preceding recording medium, document print data are subjected to a rastering process. A predetermined nominal number of lines is respectively provided for the document print data of a page. The raster print data are successively stored line by line in a print data memory region of an electronic memory. A blank line memory region for a blank line that is not to be filled with print data is provided in the memory. The raster print data are successively read out per line from the print data memory region of the memory and are supplied to the printing unit. After the read out of the nominal number of lines from the print data memory region, the blank line memory region is then read out a number of times, said number of times being a whole number greater than or equal to zero and being dependent on the sheet gap.

Abstract: In a printing system or method a first printing apparatus and a second printing apparatus are respectively selectively operable in simplex mode and duplex mode. Each of the printing apparatuses in simplex mode process print jobs independently of the respective other printing apparatus, and in duplex mode processing print jobs jointly by both of the printing apparatuses. The printing apparatuses are connected with one another for control at least in duplex mode. An activation operating unit is provided via which at least one of the two printing apparatuses is selectively activated for the simplex mode or both of the printing apparatuses are selectively activated for the duplex mode.