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US 4,088,074 AGranted
Apparatus for inking printing plates
OwnerHarold P. Dahlgren, Harvey W. Dahlgreninventors
Life of this patent
Estimating the term…
Abstract
An inker comprising two rollers having surfaces in pressure indented relation, adjacent surfaces moving in opposite directions to meter ink. A surface of one of the rollers carries a film of ink to the printing plate and thereafter an excessive quantity of ink is applied as the surface moves away from the printing plate and through an ink reservoir. The excessive quantity of ink is metered between the surfaces of the two rollers moving in opposite directions to form a fresh continuous uniform thickness for application to the printing plate. Viscosity of the ink in the reservoir is controlled.
Claims17
Apparatus to meter liquid comprising:
- a frame;
- first and second rollers;
- means rotatably securing said first and second rollers to said frame such that a metering nip is formed between adjacent surfaces of said first and second rollers;
- first and second pairs of end seal elements, each of said second pair of end seal elements having a convex peripheral surface having a radius of curvature substantially equal to the radius of curvature of said second roller;
- means urging said first pair of end seal elements into non-rotating, sealing relation with opposite ends of said first roller;
- means urging said second pair of end seal elements into non-rotating sealing relation with opposite ends of said second roller, said arcuate peripheral surfaces extending outwardly of the ends of said first end seal elements;
- a pair of end dams each having a flat sealing surface and a concave sealing surface;
- means urging said flat sealing surfaces into sealing relation with ends of said first pair of end seal elements;
- means urging said concave sealing surfaces into sealing relation with said convex peripheral surfaces on said second pair of end seal elements;
- and means to rotate at least one of said first and second rollers.
7 more elements
The combination called for claim for in wherein said first and second pairs of end seal elements comprise discs having central passages formed therethrough;
- and axles on ends of said first and second rollers, said axles extending through said passages.
Apparatus to meter ink to a printing plate comprising:
- a frame;
- first and second rollers;
- means rotatably securing said rollers to said frame;
- means urging said first roller into pressure indented relation with said second roller to form a nip;
- means to urge said second roller into pressure indented relation with a printing plate, said first roller having a hollow internal bore;
- a distribution tube in said bore, said distribution tube having longitudinally spaced apertures, said apertures being arranged such that the flow rate of liquid flowing therefrom into said bore adjacent ends of said first roller is different from the flow rate of liquid into said bore centrally of said first roller;
- means to deliver liquid to said distribution tube;
- means to remove liquid from said bore;
- variable speed drive means to rotate said first roller such that adjacent surfaces of said first and second rollers move in opposite directions;
- end dams in sealing relation with opposite ends of said first and second rollers forming an ink reservoir above said nip;
- a doctor blade;
- and means urging said doctor blade toward the surface of said first roller.
9 more elements
Apparatus to meter liquid comprising:
- a frame;
- first and second rollers;
- means rotatably securing said first and second rollers to said frame such that a metering nip is formed between adjacent surfaces of said first and second rollers;
- first and second pairs of end seal elements, each of said second pair of end seal elements having a convex peripheral surface having a radius of curvature substantially equal to the radius of curvature of said second roller;
- means urging said first pair of end seal elements into non-rotating, sealing relation with opposite ends of said first roller;
- means urging said second pair of end seal elements into non-rotating sealing relation with opposite ends of said second roller, a pair of end dams having sealing surfaces;
- means urging said sealing surfaces into sealing relation with said first and second pair of end seal elements.
4 more elements
Apparatus to meter liquid comprising:
- a frame;
- first and second rollers;
- means rotatably securing said rollers to said frame;
- means urging said first roller into pressure indented relation with said second roller to form a nip, said first roller having a hollow internal bore;
- means to deliver liquid into said bore;
- means to remove liquid from said bore;
- control means to maintain liquid removed from said bore at a constant temperature;
- variable speed drive means to rotate said first roller such that adjacent surfaces of said first and second rollers move in opposite directions;
- end dams in sealing relation with opposite ends of said first and second rollers forming a reservoir adjacent said nip;
- agitator means in said reservoir, said agitator means being adapted to control flow of liquid toward said nip;
- doctor means arranged to form a film on the surface of said first roller;
- roller means urged into pressure relation with said second roller;
- film thickness indicator means adjacent said roller means;
- speed control means connected to said variable speed drive means;
- and means operably connected between said film thickness indicator and said speed control means such that the surface speed of the first roller is regulated to maintain a controlled film thickness on said roller means.
12 more elements
Apparatus to meter liquid comprising:
- spaced side frames connectable to opposite sides of the printing press;
- means pivotally securing said side frames to opposite sides of the printing press;
- first and second rollers;
- means rotatably securing said first and second rollers to said side frames;
- actuating means secured between said side frames and opposite sides of the press to move said side frames between a first position wherein said second roller is in pressure indented relation with the printing plate, and a second position wherein said second roller is spaced from the printing plate;
- means urging said first roller into pressure indented relation with said second roller to form a nip, said first roller having a hollow internal bore;
- means to deliver liquid into said bore;
- means to remove liquid from said bore;
- variable speed drive means to rotate said first roller such that adjacent surfaces of said first and second rollers move in opposite directions;
- end dams in sealing relation with opposite ends of said first and second rollers forming a reservoir adjacent said nip;
- doctor means arranged to form a film on the surface of said first roller;
- and control means to maintain liquid removed from said bore at a constant temperature.
9 more elements
Dependencies are inferred from the claim text.