Drop quality control system for jet printing

Details Drop quality control system for jet printing Drop quality control system for jet printing

B - Operations, Transporting

41

J

B41J 2/195 (2006.01) B41J 2/115 (2006.01) B41J 2/18 (2006.01) G05D 24/02 (2006.01)

Patent

CA 2079419

ABSTRACT OF THE DISCLOSURE A method and apparatus are disclosed for controlling the flight time and composition of a marking fluid used in a continuous jet marking system. A three-way valve permits switching between fresh ink and system ink supplies. Periodically a comparison of pressure required to maintain a constant drop flight time is made by a controller. Because both supplies are in the same operating environment any difference in pressure is due to a change in system ink viscosity. Make up solvent is added, if necessary, via a pump to restore viscosity to desired values.

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