Electronically controllable ink fountain roll drive system, and

Details Electronically controllable ink fountain roll drive system, and Electronically controllable ink fountain roll drive system, and

1991-06-13

1992-02-25

Burr, Edgar S.

Printing

Planographic

Dampeners

101350, 101351, 101364, 101DIG32, B41L 2500

Patent

active

050903152

ABSTRACT:
A low-inertia, fast-acting servo motor (40) coupled through a gear to a fountain roll (20) of an inker is controlled and energized by an electronic control unit (45). The control unit controls acceleration of the fountain roll (20) during the period of time when a ductor roller (21) is in contact therewith, from speed 0 to the required speed which is necessary to rotate the fountain roll (20) about a predetermined angle (.phi.s) which, for example, is between 0.degree. and 90.degree.. During the second half of the ductor roller cycle (T), that is, when the ductor roller (21) is separated from the fountain roll (20) and in engagement with an ink transfer roller (22) of the inker, the angular speed of the fountain roll is braked to zero speed. The system permits remote command of the angle of rotation (.phi.s) of the fountain roll (20) during the half cycle (T/2) of the ductor roller (21) as the ductor roller oscillates at a speed depending on printing press machine speed. The rotation of the freely rotatable ductor roller (21) imparted thereto by the ink transfer roller (22) assists in accelerating the fountain roll (20). The closed servo loops ensure operation of the system, as commanded.

REFERENCES:
patent: 3688696 (1972-09-01), Treff
patent: 4157682 (1979-06-01), Mabrouk et al.
patent: 4570539 (1986-02-01), Rottstedt
patent: 4896602 (1990-01-01), Jenh et al.
patent: 5031535 (1991-07-01), Kipphan

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