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US 2003/0196564 A1Published application
Printing unit of a sheet-fed printing press
AssigneeRyobi Ltd.
InventorsAtsushi Sejima, Masahiro Hino
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AssigneeRyobi Ltd.
InventorsAtsushi Sejima, Masahiro Hino
Estimating the term…
A printing unit of a sheet-fed printing press for printing on sheets includes a plate cylinder having a circumference, on which a recess is formed; a feed reel mounted within the recess for feeding a printing film onto the circumference of the plate cylinder so as to introduce an image forming region for each printing operation; an image forming device for forming an image on the image forming region of the printing film fed on the circumference of the plate cylinder with the first edge of the image forming region positioned at an edge of the recess closer to the rewind reel; a rewind reel mounted within the recess for rewinding the printing film from the circumference of the plate cylinder; and a control unit for controlling the length of the printing film to be fed from the feed reel onto the circumference of the plate cylinder, based upon the length of sheets to be printed for each printing operation.
A printing unit of a sheet-fed printing press for printing on sheets comprising:
A printing unit of a sheet-fed printing press for printing on sheets comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
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 end not estimated
This application claims priority from Japanese Patent Application Nos. 2002-115028 and 2002-317441, which are incorporated herein by reference.
1. Field of the Invention
The present invention relates to a printing unit of a sheet-fed printing press.
The above, and other objects, features and advantages of the present invention will become apparent from the detailed description thereof in conjunction with the accompanying drawings wherein.
FIG. 1 is a schematic view of an essential part of the printing unit according to one embodiment of the present invention.
FIGS. 2A and 2B are schematic views illustrating the procedures for controlling the length of the printing film to be fed from the feed reel of the printing unit according to the one embodiment of the present invention. Specifically, FIG. 2A illustrates a state where an image for the first printing operation has been formed, and FIG. 2B illustrates a state where an image for the second printing operation has been formed.
An embodiment of the printing unit according to one embodiment of the present invention will be herein described with reference to the drawings attached hereto. FIG. 1 is a schematic view of the essential part of the printing unit according to this embodiment of the present invention, in which the same members or parts as those of the conventional printing unit of FIG. 6 are assigned the same reference numbers to omit the detailed description thereof.
The printing unit of this embodiment is for two-color printing, so that the plate cylinder 2 is structured to place two webs of the printing film 1 around the circumference. Specifically, two printing rolls 10 for feeding the respective webs of the printing film 1 are mounted at two places. For this, two sets of the feed reels 5 and the rewind reels 6 are arranged. Two sets of the ink feeding parts 3, each made up of several ink rollers, are also arranged so as to feed two colors of ink.
The plate cylinder 2 forms two recesses located on the circumference about 180 degrees opposite to one another. These recesses 4 extend in the axial direction of the plate cylinder 2, thereby each having an overall appearance of a recessed groove. By these recesses 4, the circumference of the plate cylinder 2 is divided into two sections, and the two webs of the printing film 1 are respectively placed around these sections.