Envelope gum detection

Details Envelope gum detection Envelope gum detection

G - Physics

01

N

G01N 21/95 (2006.01) B31B 1/62 (2006.01) B31B 49/04 (2006.01)

Patent

CA 2599323

Two sensors and an Operator Interface are mounted on an envelope machine inline after the side seam gumming system. As the envelope under the sensors, they measure the luminance / reflectivity of a certain spot on the envelope where the side seam gum should be located. The reflectivity of the side seam gum will be different than that of the envelope paper. If the reflectivity measurement at that position is within the preset values in the device, the envelope is within the specification and nothing happens; the envelope continues through the machine. If the measurement does not meet the values in the device, the envelope 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 as defective.

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