US 4,361,090 AGranted

Selective intermittent lifter and film inking system for printing machines

AssigneeMAN Roland Druckmaschinen AG

InventorsFriedrich Klingler, Manfred Makosch

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Abstract

To provide for selective strip or intermittent ink feed or film ink feed to an offset printing machine, a ductor roller (1) picks up ink from an ink trough (7); a lifter roller (2) is selectively positionable either in intermittent contact between the ductor roller (1) and an ink receiving transfer roller (4) when in strip or intermittent mode, and in continuous engagement with the ink receiving transfer roller (4) when in ink film mode; for ink film mode of operation, additionally, an additional transfer roller (3) is engaged with the ductor roller (1) and the lifter roller (3) in continuous engagement with the receiving transfer roller (4), the engagement between the ink transfer roller (3) and the ductor roller (1) including an ink transfer and stripping nip of suitable width. The additional transfer roller (3) is carried along by friction, the relative surface speeds between the driven ductor roller (1) and the plate cylinder being preferably about 1:60. The surface of the additional transfer roller (3) may be texturized, and made of hard material such as metal, the lifter roller being rubberized, to provide for sequential hard-soft-hard sequence of engaging surfaces.

Claims10

Dependent claims

Inking system for selective intermittent ink supply, or continuous film ink supply mode of operation, having

an ink trough (7);
a driven ink ductor roller (1) in ink receiving relationship with respect to the ink trough (7);
an ink distribution roller system including an ink receiving and transfer roller (4) and a plurality of distribution rollers (4a) for distributing ink and applying the ink to a plate cylinder (P) of a printing machine;
an ink lifter roller (2);
and means (5) selectively controlling engagement of the ink lifter roller (2) in accordance with the selected operating mode
(a) in strip or intermittent mode, alternate engagement of the lifter roller (2) with the ink ductor roller (1) and the ink receiving and transfer roller (4), or
(b) in film ink mode, continuous engagement with the ink transfer roller;
and comprising, in accordance with the invention,
an additional ink transfer roller (3) having a hard, texturized surface;
and means (6) selectively controlling positioning of the additional ink transfer roller (3), in accordance with the selected operating mode
(a) in strip or intermittent mode, out of engagement with said lifter roller (2) or
(b) in film ink mode, in engagement with said ductor roller (1) and said lifter roller (2).

9 more elements

Dependencies are inferred from the claim text.