Abstract: A controller for a printing unit has a standard hardware board provided with a central processing unit, an I/O-unit and a central bus system connected to the central processing unit and the I/O-unit. The I/O-unit has a connector for connecting the central bus system to a memory board that comprises one or more memory chips for storing bitmap data or compressed bitmap data of a page to be printed. The memory board has a second bus system and a memory reader connected to the memory chips via the second bus system for reading the data and transmitting them to a printer. The second bus system unloads the data read process from the central bus system, freeing it to be available more of the time for use by the CPU.

Abstract: A method and device for controlling an image forming device in which image forming stations can form an image on a medium that is advanced past these stations. For each image under formation, the positions occupied by the leading and trailing edges are registered with respect to the image forming stations. Signals for controlling the image forming stations are generated depending upon the positions registered. In doing so, the positions of the leading and trailing edges are compared with predetermined positions belonging to a first and second group respectively. If two compared positions correspond to one another, a control signal will be generated that is associated with the specific predetemined position used for the comparison.

Abstract: Electrophotographic apparatus, provided with an endless photoconductive belt having a seam, said belt being taken past a number of processing stations, including a charging and a developing station, in order to form an image on said belt. An image formed is transferred onto receiving material in a transfer station. A check is made for each image to be formed to determine whether the seam is situated inside the belt section intended for forming that image. If the seam is situated inside that belt section no receiving material is fed to the transfer station and that belt section is discharged before that section reaches the developing station.