Détection d'adhésive appliqué sur des enveloppes

N° de brevet: EP1900506 (A1)
Date de publication: 2008-03-19
Inventeur(s): CLARK VERNER F JR [US];
Demandeur(s): NAT ENVELOPE CORP [US];
Classification: B31B19/00;B31B19/74;
N° de demande: EP20070115793 20070906 
Numéro(s) de priorité: US20060522017 20060915 
Two sensors (10, 10') and an Operator Interface (30) are mounted on an envelope machine inline after the side seam gumming system (62, 64, 66). As the envelope (50) passes under the sensors (10, 10'), they measure the luminance / reflectivity of a certain spot on the envelope (50) where the side seam gum (20) should be located. The reflectivity of the side seam gum (20) will be different than that of the envelope (50) paper. If the reflectivity measurement at that position is within the preset values in the device, the envelope (50) is within the specification and nothing happens; the envelope (50) continues through the machine. If the measurement does not meet the values in the device, the envelope (50) is out of specification, and an output signal is returned. That output signal may be used for any purpose, but most commonly activates a red light, or marks the envelopes (50) as defective. 



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