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US 4,229,645 AGranted
Detector and recorder of holes and disruptions in plastic material sheets and webs
AssigneesAnic S.p.A., Costruxioni Elettriche Automatiche Impianti (C.E.A.I)
InventorsCarlo Vigano, Francesco Quattrone, Erio Toffanetti
Life of this patent
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Abstract
A device is disclosed for continuously counting up the pinholes and the rips (continuous disruptions) in a film or web of plastic materials, said device having a gating circuit which is capable of distinguishing the pinholes from the rips thus giving a more reliable indication than was possible with the conventional devices also based on detection of electric discharges.
Claims4
A device for detecting pin holes on moving films or webs of plastic materials comprising:
- a high voltage electrode and a grounded roller between which the web passes during coiling;
- means coupled to the roller for detecting pin holes in the web based on electrical discharges;
- and
- means for counting rips in the web, said rip counting means including an inhibiting device coupled to said detecting means and comprising a flip-flop, a first counter for recording pin holes by counting discrete electrical discharges, a second counter for recording consecutive electrical discharges indicative of a rip, gating means responsive to said flip-flop for coupling signals of said detecting means to said first and said second counters, said gating means including means responsive to a rate of occurrence of consecutive discharges to set said flip-flop for switching signals of said detecting means to the second counter, and means for resetting the flip-flop to signal discrete discharges after a preselected length of film having no defects has run past.
1 more element
Dependencies are inferred from the claim text.