System for determining dampening water for an offset press using

Details System for determining dampening water for an offset press using System for determining dampening water for an offset press using

1996-08-29

1997-07-08

McGraw, Vincent P.

Optics: measuring and testing

Of light reflection

101DIG45, G01N 2155, G01N 2185

Patent

active

056467389

ABSTRACT:
A LED radiates light on a plate held on plate cylinder upon receiving a radiation start signal, so as to form an irradiated area on plate. A photo diode (PD) senses substantially only conventional catoptric light reflected from irradiated area and generates the sensed signal representing the conventional catoptric light intensity. A data processing unit computes the dampening volume based on the sensed signal which is stored in storage device 9, storage device 9 then generates dampening volume signal. The LED is held in such manner that an incident angle of the light in connection with the surface of the irradiated area is made at predetermined angle sufficient for changing the conventional catoptric light intensity sensed by PD in accordance with the dampening volume.

REFERENCES:
patent: 4052937 (1977-10-01), Lawson et al.
patent: 4565450 (1986-01-01), Wirz et al.
patent: 4737035 (1988-04-01), Aoki et al.
patent: 5108186 (1992-04-01), Kipphan et al.
patent: 5162865 (1992-11-01), Kipphan et al.

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