Printing – Multicolor – Rotary machines
Patent
1997-12-30
2000-04-18
Fisher, J. Reed
Printing
Multicolor
Rotary machines
10135201, B41F 710, B41F 3106
Patent
active
06050188&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a sheet-fed offset rotary printing press.
DESCRIPTION OF THE PRIOR ART
A three-cylinder rotary rubber blanket printing press is known from DE-PS 435 592, wherein the plate and rubber blanket cylinders each have at least two print areas, and an impression cylinder has one more print area than the rubber blanket cylinder.
It is disadvantageous in connection with this prior printing press that registration problems can occur, since a sheet to be printed is already removed from the impression cylinder by a gripper system before this sheet has been completely printed.
DE 43 03 797 A1 and FR-A-564 212 disclose sheet-fed offset printing presses wherein a sheet is taken over by a sheet-delivering gripper system only at the termination of the printing process between a rubber blanket cylinder and printing cylinder.
WO 90/02044 describes a rotary printing press with a printing plate which is arranged on a printing cylinder and can be inscribed by a laser. An axially displaceable laser inscribing system is associated with the printing cylinder.
A sheet-fed rotary printing press for multi-color printing with a central impression cylinder is known from GB-A-10 154. A printing cylinder having two print areas is associated with this printing cylinder.
EP 0 359 957 A2 discloses a printing press with a short inking unit. The short inking unit essentially consists of a chamber doctor blade, a rotating roller and an in application roller.
DE-PS 521 874 describes a sheet-fed rotary printing press for direct multi-color printing, with a printing cylinder and an impression cylinder. In this case the printing cylinder has four print areas and the impression cylinder has five gripper systems.
U.S. Pat. No. 1,919,462 discloses a sheet-fed rotary printing press for direct multi-color printing, wherein five printing cylinders are associated with a central impression cylinder.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a sheet-fed rotary offset printing press.
In accordance with the present invention, this object is attained by a sheet-fed offset rotary printing press which includes a first printing cylinder, a first rubber blanket cylinder and a central impression cylinder that is provided with a plurality of controlled gripper systems. A second printing cylinder and a second blanket cylinder are also associated with the central impression cylinder. A stack of sheets to be printed and a stack of printed sheets are both positioned on the same side of the sheet-fed offset rotary printing press. The printing cylinders and the blanket cylinders have the same diameters and each have at least two print areas. The number of gripper systems of the impression cylinder is not equal to the number of print areas on each of the printing cylinders. A sheet delivery gripper system is associated with the impression cylinder in a manner such that a sheet of a maximum format length is taken over by this gripper system only upon completion of the printing process between the rubber blanket cylinder and the impression cylinder. A short inking unit may be associated with each print area of each of the printing cylinders. Ink application rollers of these short inking units can be moved into and out of engagement with their associated printing cylinders.
Multi-color printing with a registration of the greatest accuracy is achieved in an advantageous manner by means of the sheet-fed offset rotary printing press in accordance with the present invention, since during all printing steps the sheets to be printed are maintained in a single gripper system on an impression cylinder. Only after the sheet has been completely printed are each of the printed sheets taken over by a second gripper system and removed from the impression cylinder.
By the utilization of a sheet-feeding device that is synchronized with the impression cylinder, and which accelerates the sheets to be fed in from a state of rest to the circumferential speed of the impression cylinder, assured she
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Fisher J. Reed
Koenig & Bauer--Albert Aktiengesellschaft
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