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AssigneeKBA-Giori S.A.
InventorsStephen Brown, Eric Fivaz
Estimating the term…
The ink-agitator (1) is supported and guided by fixed means between pedestals (2) and (3) above an ink fountain containing security ink. It is driven in alternate movement on its guiding means and its tip is dipping into the ink. Bore (11) receives a detector head in the form of a transformer with primary winding arranged for normally producing a “zero” magnetic field, adjustable ferrite core place in such a manner that the “zero” magnetic field is obtained for a standard magnetic property of the security ink, and secondary winding going out of balance and issuing a signal if the magnetic property of the ink into which the tip of the ink-agitator is displaced undergoes modifications. The output signal is transmitted to feed line (4) with slide contact (6) whereas the ground pole is connected through wire (5) and sliding contact (7).
Device for continuously checking the production of security printing machines equipped with at least one ink fountain containing a security ink provided with an invisible feature, wherein an ink property detector with sensitivity in the range of said security feature is provided into an element placed in said ink fountain, and the outout of said detector is continuously collected and transmitted to a warning device, said detector is integrated to an ink agitator comprising a finger element with a tip extending into the ink fountain, said finger element being continuously displaced in said fountain and the ink property detector having an output connected to the warning device, wherein the detector is further arranged for checking a magnetic property of the security ink, said detector comprising a ferromagnetic transducer connected to a transducer circuit connected itself to a control box, said ferromagnetic transducer comprising a ferrite core and an associated set of coaxial coils, the whole forming a transformer with primary and secondary windings, the secondary winding being constituted by one of said coils connected to the control box through the transducer circuit and a pair of electrical tracks.
Device for continuously checking the production of security printing machines equipped with at least one ink fountain containing ink provided with an invisible security feature, said device comprising an ink agitator arrangement with an agitator finger element continuously displaced relative to said ink fountain and having a tip continuously dipping into said ink in said ink fountain, wherein an ink property detector with sensitivity in the range of said security feature is lodged into said tip and the output of said detector is continuously collected and transmitted to a warning device.
Dependencies are inferred from the claim text.