To permit, selectively, multi-color prime printing or prime and verso printing on printing machines having plate blanket, and printing cylinders of the same diameter, the printing cylinders (8,9;51,52,53;77) have a rubber blanket thereon to receive printing information from the blanket cylinders (6,
To permit, selectively, multi-color prime printing or prime and verso printing on printing machines having plate blanket, and printing cylinders of the same diameter, the printing cylinders (8,9;51,52,53;77) have a rubber blanket thereon to receive printing information from the blanket cylinders (6,7;48,49,50;75,76) during one phase of operation and transferring this information to the sheet by engagement with the sheet supply or transport cylinders (12,60,78) which are formed with surfaces permitting them to operate as impression or printing cylinders, sheet supply being arranged to provide sheets in this mode of operation for every two revolutions of the cylinders only, to permit information transfer during the intervening idle, or non-printing phase or revolution. To prevent smearing, or transfer of unwanted ink, the blanket cylinders are supported in bearings which can rock about the center of rotation of the associated plate cylinders, under control of a control unit (C) to be placed in, or out of engagement with the printing or impression cylinders, in dependence on desired operation - multi-color prime printing or prime-and-verso printing under control of the control unit (C).
대표청구항▼
Method of selectively printing multi-color, or prime-and-verso printing in a rotary sheet of said printing machine having a sheet supply apparatus (3,44,72); at least one sheet supply cylinder (12,60,78); at least two rubber blanket cylinders (6,7;48,49,50;75,76) in continuous surface engagement wit
Method of selectively printing multi-color, or prime-and-verso printing in a rotary sheet of said printing machine having a sheet supply apparatus (3,44,72); at least one sheet supply cylinder (12,60,78); at least two rubber blanket cylinders (6,7;48,49,50;75,76) in continuous surface engagement with an associated respective plate cylinder; at least one printing or impression cylinder (8,9;55,52,53;77), said printing or impression cylinder having a rubber blanket thereon, comprising, in accordance with the invention, controlling the respective engagement positions of at least one of the rubber blanket cylinders (6,50,75) and the associated printing or impression cylinder (8,52,77) in intermittent operation by (a) positioning the at least one rubber blanket cylinder, carrying verso printing information, and the associated printing or impression cylinder to be separated from each other during essentially one revolution of the respective cylinders, to form a first operating phase; (a1) positioning the at least one rubber blanket cylinder and the associated printing cylinder in surface engagement with each other to effect transfer of printed subject matter and for verso printing during essentially a sequential revolution of the respective cylinder, and forming a second operating phase; (b) positioning the printing or impression cylinder (8,52,77) and the sheet supply cylinder (12,60,78) during said first phase to effect verso printing and (b1) positioning said printing or impression cylinder and the sheet supply cylinder to be separated or surface-disengaged from each other during said second operating phase; and (c) positioning selected ones of the rubber blanket cylinders (7;48,49;76) and the associated printing or impression cylinders (9;51,52;77) during said first operating phase to effect prime printing and (d) then positioning said selected ones of the rubber blanket cylinders and the associated printing or impression cylinders during a second operating phase at surface-separated positions.
Johne Albrecht (Dresden DT) Forster Karl-Heinz (Dresden DT) Schanze Klaus (Radebeul DT), Printing arrangement alternatively operated for one-side printing and two-side printing with control system therefor.
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