B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
341/37, 178/3.2
B41F 33/10 (2006.01) B41F 31/00 (2006.01) B41F 33/00 (2006.01) G05D 24/02 (2006.01)
Patent
CA 1222803
ABSTRACT Disclosed is a method and apparatus for controlling and keeping constant the colour density of a print. The apparatus comprises a sensor connected with a device for measuring the reading signal after amplification by an amplifier. The amplitude measuring device and a rated variable voltage source are connected to a comparator. This comparator has an output connected to a PID regulator, the output signal of which is connected to one input of a first adder having a second input connected to a potentiometer. The output of the first adder is connected to one input of a second adder having a second input connected with a viscosimeter. The signal produced by the second adder is sent to an amplifier connected to a command circuit for a pair of mixer valves. The command circuit can be locked or released by means of a level indi- cator in a tank for an ink/solvent mixture. The command circuit also actuates a pump and the valve of a return circuit for the ink/ solvent mixture.
456989
Bobst S.a.
Smart & Biggar
LandOfFree
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