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    • 3. 发明专利
    • Sheet-fed printing press and process for printing of a multicolor print image
    • CZ292278B6
    • 2003-08-13
    • CZ23099
    • 1997-07-23
    • ROLAND MAN DRUCKMASCH
    • SIMETH CLAUS
    • B41F21/00B41F7/02B41F7/06B41F11/00B41F21/05B41F31/18
    • The present invention relates to a sheet-fed printing machine having a sheet-feeding unit and a control device assigned thereto for sheet feeding and operating synchronously with the machine cycle. When collecting printing images on a rubber roller (21, 26) or on a gripped printing sheet, said sheet-feeding unit feeds a printing sheet or waste sheet, only. The sheet-fed printing machine further has sheet-guiding printing cylinders (5, 22) or drums (4, 6, 7, 8, 13, and 14) for transportation of at least one printing sheet. At the same time, the printing sheet is gripped by means of the printing cylinder (5, 22), optionally the sheet-guiding drum (6) for printing with one or several colors and for at least one passage through a printing zone. Printing process is characterized in that two partial images of a two-color printing image are transferred from a plate cylinder (10) to a rubber cylinder (21, 26) so that the two-colored printing images are collected overlapping each other on the rubber cylinder (21, 26) for printing on the gripped printing sheet. Printing images are then transferred together onto printing sheet to be printed. At the beginning of printing, first both the partial images are applied to the rubber cylinder (21, 26), whereupon both the partial images are applied in position-correct overprint to the first printing sheet. The subsequent and next printing sheets are synchronously fed only when a complete new printing image on the rubber cylinder (21, 26) is prepared.