Newspaper printing system

A printing system wherein first and second lithographic printing plates are urged into pressure relation with opposite sides of a web moving between the printing plates, the improvements comprising:

• a resilient surfaced form roller in pressure relation with each lithographic printing plate to form a first nip;
• an ink transfer roller having an ink receptive surface urged into pressure indented relation with said form roller to form an ink transfer nip;
• a vibrator roller having an ink receptive surface urged into pressure indented relation with a portion of the surface of said form roller which is moving from said first nip toward said ink transfer nip;
• means applying ink to the surface of the ink transfer roller;
• brake means to adjust the surface speed of the ink transfer roller relative to the surface speed of the form roller to control the amount of ink carried by the form roller from the ink transfer nip to said first nip;
• and dampener means applying dampening fluid to ink on said form roller.

A printing system wherein low viscosity ink and dampening fluid are applied to opposing lithographic printing plates which simultaneously engage opposite sides of a web, the improvement comprising:

• support means;
• first and second plate cylinders;
• a lithographic printing plate on each of said plate cylinders;
• means rotatably securing said plate cylinders to said support means such that said lithographic printing plates engage opposite sides of a web moving between said plate cylinders;
• first and second form rollers;
• means urging said first and second form rollers into pressure indented relation with said first and second lithographic printing plates;
• first and second inkers and dampeners arranged to continuously apply a metered film of ink and dampening fluid over said first and second form rollers directly to said lithographic printing plates, each of said inkers comprising:
• an ink metering means;
• an ink transfer roller having an oleophillic ink receptive surface urged into pressure relation with a respective one of said form rollers to form an ink transfer nip;
• means supporting said ink metering means and said ink transfer roller to maintain a pressure relationship therebetween to form an ink metering nip between adjacent surfaces of the ink metering means and the ink transfer roller;
• means to supply ink to said ink transfer roller such that the ink metering means produces a continuous quantity of ink on the surface of said ink transfer roller;
• an ink storage roller having an oleophillic surface;
• means supporting said ink storage roller in pressure relation with said ink transfer roller, said ink storage roller adapted to remove excess ink and smooth and replenish the excess ink on the surface of the ink transfer roller prior to the ink film moving to a respective one of said form rollers;
• speed control means to control the surface speed of said ink transfer roller relative to the surface speed of a respective one of said form rollers to control the thickness of a newly metered film of ink on a respective one of said form rollers;
• and each of said dampeners comprising:
• a hydrophilic dampening fluid transfer roller adapted to apply a uniform film of dampening fluid to the surface of the newly metered film of ink on the surface of a respective one of said form rollers;
• means rotatably supporting said hydrophilic dampening fluid transfer roller in pressure indented relationship with a respective one of said form rollers;
• dampening fluid metering means;
• and mean to supply dampening fluid to said hydrophilic dampening fluid transfer roller such that the dampening fluid metering means produces a smooth, uniform, continuous film of dampening fluid on the surface of the hydrophilic dampening fluid transfer roller.

A printing system wherein low viscosity ink and dampening fluid are applied to opposing lithographic printing plates which simultaneously engage opposite sides of a web, the improvement comprising:

• support means;
• first and second plate cylinders;
• a lithographic printing plate on each of said plate cylinders;
• means rotatably securing said plate cylinders to said support means such that said lithographic printing plates engage opposite sides of a web moving between said plate cylinders;
• first and second form rollers;
• means urging said first and second form rollers into pressure indented relation with said first and second lithographic printing plates;
• first and second inkers and dampeners arranged to continuously apply a metered film of ink and dampening fluid over said first and second form rollers directly to said lithographic printing plates;
• an ink vibrator roller supported in rotative contact with the surface of the film of ink and dampening fluid on each of said form rollers, said ink vibrator roller being adapted to substantially equalize the surface of the film of ink and dampening fluid, each of said inkers comprising:
• an ink metering means;
• an ink transfer roller having an oleophillic ink receptive surface urged into pressure relation with a respective one of said form rollers to form an ink transfer nip;
• means supporting said ink metering means and said ink transfer roller to maintain a pressure relationship therebetween to form an ink metering nip between adjacent surfaces of the ink metering means and the ink transfer roller;
• means to supply ink to said ink transfer roller such that the ink metering means produces a continuous quantity of ink on the surface of said ink transfer roller;
• speed control means to control the surface speed of said ink transfer roller relative to the surface speed of a respective one of said form rollers to control the thickness of a newly metered film of ink on a respective one of said form rollers;
• and each of said dampeners comprising:
• a hydrophilic dampening fluid transfer roller adapted to apply a uniform film of dampening fluid to the surface of the newly metered film of ink on the surface of a respective one of said form rollers;
• means rotatably supporting said hydrophilic dampening fluid transfer roller in pressure indented relationship with a respective one of said form rollers;
• dampening fluid metering means;
• and means to supply dampening fluid to said hydrophilic dampening fluid transfer roller such that the dampening fluid metering means produces a smooth, uniform, continuous film of dampening fluid on the surface of the hydrophilic dampening fluid transfer roller.