Printing – Planographic – Dampeners
Patent
1989-11-28
1991-08-13
Crowder, Clifford D.
Printing
Planographic
Dampeners
101148, B41L 2504
Patent
active
050386794
ABSTRACT:
A dampening fluid mist application system for lithographic printing comprises a container for the dampening fluid and a rotatable first roller having a rough surface for picking up and entrapping fluid from the container. A rotatable second roller having a brush surface contacts the first roller to transfer fluid from the surface of the first roller to bristles on the brush surface. A deflector bends and releases the bristles to eject fluid thereon and create a mist stream of the liquid. The rough surface on the second roller is employed to provide the desired amount of dampening fluid to the bristles and may be made of wire mesh or a series of spaced projections or knobs, for example. The deflector is made up of a plurality of separate blade segments whose edges contact different brush segments along the full width of the second roller. An adjustment mechanism independently moves the separate blade segments toward and away from the second roller in a coarse adjustment between bristle engaging and disengaging positions, while a fine adjustment in the bristle engaging position varies the degree of bending of the bristles between a minimum and a maximum. The dampening fluid application system is suitable for incorporation into new printing systems or retrofitting into existing printing systems to apply the dampening fluid mist stream to the region between rollers in the train of ink transfer rollers.
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Crowder Clifford D.
Hilten John S.
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