Nozzle control system particularly for envelope flap moistener

In a high speed mailing machine, envelopes 42 are moved past a moistening nozzle 16 along a given path with the opened flap extending from the envelope. A sensor attached to the nozzle senses the location of the edge of the flap as the flap moves past the nozzle, and causes the nozzle to track the f...

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Bibliographic Details
Main Author NORMAN J BERGMAN
Format Patent
LanguageEnglish
Published 27.04.1994
Edition5
Subjects
BUREAU ACCESSORIES
BUREAU ACCESSORIES NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
TRANSPORTING
WRITING OR DRAWING IMPLEMENTS
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Summary:In a high speed mailing machine, envelopes 42 are moved past a moistening nozzle 16 along a given path with the opened flap extending from the envelope. A sensor attached to the nozzle senses the location of the edge of the flap as the flap moves past the nozzle, and causes the nozzle to track the flap edge. The nozzle is pre-positioned in response to an envelope sensor 70 located further upstream of the tracking sensor. When the upstream sensor 70 to detects the arrival of an envelope, the nozzle is moved to a start position. The tracking sensor may be mounted so that it moves with the nozzle. A low bandwidth servo loop controls the response to the upstream sensor and a higher bandwidth servo loop controls tracking of the nozzle in response to the tracking sensor. It is not necessary to use stored or computed envelope flap profiles, envelope speeds, etc., for the nozzle to track the envelope flap.
Bibliography:Application Number: GB19930024892