Adjustable supply rate dampening mechanism for planographic prin

Details Adjustable supply rate dampening mechanism for planographic prin Adjustable supply rate dampening mechanism for planographic prin

1999-02-16

2000-04-18

Asher, Kimberly L.

Printing

Planographic

Dampeners

101148, 101366, B41F 332, B41F 334, B41F 730, B41F 724

Patent

active

060501863

ABSTRACT:
For moistening a water roller in contact with a planographic printing plate on a plate cylinder in an offset printing press, a sprayer produces a more or less flat spray of dampening water. Baffles are positioned in front of the sprayer to define an aperture through which the spray travels before hitting the water roller. The aperture has a width shorter than the longer dimension of the cross section of the spray as measured in a plane containing the aperture, and longer than the shorter dimension of the cross section of the spray in the same plane. Thus the rate at which the dampening water is supplied to the water roller is infinitely variable by changing the angular position of the spray relative to the aperture between a minimum dampening position where the spray has the opposite longitudinal end portions of its cross section interrupted to the utmost by the baffle means and a maximum dampening position where the spray is allowed wholly through the aperture. In practice a series of rotary sprayers may be arranged along the axis of the water roller.

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patent: 5014615 (1991-05-01), Lin et al.
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patent: 5038681 (1991-08-01), Hultberg
patent: 5299495 (1994-04-01), Schoeps et al.
patent: 5644981 (1997-07-01), Ohno et al.
patent: 5706723 (1998-01-01), Ohno
patent: 5782180 (1998-07-01), Schneider et al.

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