Method and device for maintaining density of a printed color con

Details Method and device for maintaining density of a printed color con Method and device for maintaining density of a printed color con

1984-06-20

1985-11-12

Cohan, Alan

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

137 92, 137 93, B41F 3100

Patent

active

045521654

ABSTRACT:
In a system for maintaining density of a printed color constant, a reading unit is connected with a unit measuring the reading signal. An amplitude measuring unit and a rated variable voltage source are connected with a comparator. The comparator is connected with a PID regulator, the signal of which is connected with a first adder which itself connects with a viscosity code setting potentiometer. The first adder is connected with a second adder connected to a viscosimeter. The signal produced by the second adder is sent to an amplifier connected with a command circuit for controlling mixer valves for ink and solvent. This command circuit can be locked or released by means of signals received from a level indicator in a tank. The command circuit also actuates a pump and a valve of a return circuit of the ink/solvent mixture. The system is employed for controlling and keeping constant color density of a print.

REFERENCES:
patent: 2978951 (1961-04-01), Christie
patent: 3299787 (1967-01-01), Kolb
patent: 4256131 (1981-03-01), De Remigis

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