| 摘要 |
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.
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