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US 4,395,946 AGranted
Rotary printing presses with inplace laser impression of printing surface
AssigneeCrosfield Electronics Limited
InventorBenjamin W. J. Price
Life of this patent
Estimating the term…
Abstract
A rotary printing press includes a laser beam imaging device to enable a rotary printing member to be prepared while it is located in the printing press. This arrangement has particular advantages when it is used with a lithographic or a gravure printing press and especially when used as a proofing press for color lithography or color gravure.
Claims12
A rotary colour printing press, comprising:
- (a) a cylindrical printing cylinder capable of carrying at least two permanent printing images corresponding to at least two different colour separations of the same image,
- (b) an impression cylinder,
- (c) means for holding a sheet of substrate to be printed on said impression cylinder,
- (d) at least two inking assemblies for applying liquid printing inks of at least two different colours corresponding to said different colour separations, each of said inking assemblies applying ink only to its corresponding colour separation, and
- (e) a laser beam imaging device operatively associated with said printing press for forming said at least two permanent printing images on said cylindrical printing cylinder while said printing cylinder is located in said printing press, said substrate being held in a fixed position on said impression cylinder until it has been contacted and printed by all of said different colour separations.
2 more elements
A gravure colour printing press including:
- a cylindrical printing cylinder;
- an impression cylinder;
- means to hold a sheet of substrate to be printed on said impression cylinder;
- at least two inking assemblies;
- a doctor blade in each of said inking assemblies, each of said doctor blades being movable towards and away from said printing cylinder;
- and,
- a laser beam engraving device for engraving an image on said cylindrical printing cylinder, said press being arranged whereby engravings corresponding to at least two colour separations of the same image are engraved around said cylindrical printing cylinder using said laser beam engraving device and then, subsequently, each of said inking assemblies applies ink only to its corresponding engraved colour separation and each said doctor blade contacts only its corresponding engraved colour separation;
- the substrate being held in a fixed position on said impression cylinder until it has been contacted and printed by all of said different engraved colour separations.
5 more elements
A lithographic colour printing press including:
- a cylindrical printing cylinder;
- a lithographic plate imagible by a laser beam;
- an impression cylinder;
- means to hold a sheet of substrate to be printed on said impression cylinder;
- at least two inking assemblies;
- final ink applying rollers of said inking assemblies being movable towards and away from said printing cylinder;
- a laser beam imaging device for forming an image on said lithographic plate, said press being arranged whereby images corresponding to at least two colour separations of the same image are imaged around said lithographic plate on said cylindrical printing cylinder using said laser beam imaging device to produce a lithographic plate and then, subsequently, each of said inking assemblies applies ink only to its corresponding imaged colour separation, the substrate being held in a fixed position on said impression cylinder until it has been contacted and printed by all of said different colour separations on said printing cylinder.
4 more elements
Dependencies are inferred from the claim text.