Back to results
US 6,668,720 B2Granted
Apparatus for image formation on cylindrical surfaces in printing machines
AssigneeKoenig & Bauer Aktiengesellschaft
InventorArndt Jentzsch
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeKoenig & Bauer Aktiengesellschaft
InventorArndt Jentzsch
Estimating the term…
The invention relates to an apparatus for image formation on cylindrical surfaces of printing machines. The object of the invention is to provide a compact image formation unit with a broad application rage regarding its usage, the sequence in time and variation in time of the process steps. The invention accomplishes this by processing units mounted on slides movable separately on a common cross bar. Each slide carries at least one processing unit. The cross bar is located in a gusset area between a plate cylinder and a blanket cylinder.
An apparatus for image formation on cylindrical surfaces in printing machines, comprising:
An apparatus for image formation on cylindrical surfaces in printing machines, comprising:
An apparatus for image formation on cylindrical surfaces in printing machines, comprising:
An apparatus for image formation on cylindrical surfaces in printing machines comprising:
An apparatus for image formation on cylindrical surfaces in panting machines, comprising:
An apparatus for image formation on cylindrical surfaces in printing machines, comprising:
An apparatus for image formation on cylindrical surfaces in printing machines, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
For lithographic printing; Master sheets for transferring a lithographic image to the forme: mechanical aspects of on-press plate preparation
Mounting or handling printing plates; Forming printing surfaces in situ: forming the printing surface directly on the form cylinder
Processes for the manufacture or reproduction of printing surfaces
Indexing scheme relating to printing, lining machines, typewriters, and to stamps
Term ended 6 Sep 2021 (estimated)
The present invention relates to an apparatus for image formation on cylindrical surfaces in printing machines comprising multiple processing units arranged side by side and allocated to the plate cylinder of the printing machine. The processing units can be moved axially to the plate cylinder.
A printing machine with a printing unit having a gapless image cylinder,.which is coated with a dryable polymer by a direct image formation process, is known through DE 19612927 A1. The surface characteristic of this polymer layer on the image cylinder is changed completely or partially by a selective laser beam in order to change its affinity to printing ink. The image cylinder is used instead of a plate cylinder in a conventional offset press either in wet offset or dry offset printing. The image cylinder is cleaned from the image carrying layer after finishing printing. The layer must not be removed completely. The radiation source, the coating unit and the drying unit are arranged side by side on a spindle drive and moved by the spindle drive over the width of the cylindrical surface to be imaged. The cleaning unit is mounted separately.
The disadvantage of this solution is the lack of processing space caused by the number and fixed allocation of the processing units. The versatility of this apparatus is insufficient for many applications.
The present invention is described below in greater detail by exemplary embodiments of the invention and by reference to the drawings, wherein:
FIG. 1 is a schematic drawing illustrating the roller and cylinder scheme of a printing unit in a printing press with an embodiment of the apparatus of the present invention mounted on a cross bar;
FIG. 2 is a schematic drawing illustrating an embodiment of the apparatus of the present invention mounted on a fixed spindle;
FIG. 1 shows a printing unit of a multi-color sheet fed offset press. The printing unit contains an impression cylinder 3 carrying the sheet and, as the image transferring cylinders, a plate cylinder 1 and a blanket cylinder 2.
An inking unit 4 and a dampening unit 5 are allocated to the plate cylinder 1. The plate cylinder 1 can also carry a printing form, which is not shown in the drawings.
A cross bar 71 is located in a gusset area 12 between the place cylinder 1 and the blanket cylinder 2. The cross bar is located in such a manner that other elements in this area, for instance a cleaning unit 16, are not obstructed in their operational space. The cross bar 71 carries processing units 9, 10 and 11 for image formation on the surface of the plate cylinder 1 with respect to a printing form mounted on the plate cylinder 1.