System and method for controlling web output in an envelope processing apparatus
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United States of America Patent
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Dec 20, 2016
Grant Date -
Oct 10, 2013
app pub date -
Apr 9, 2013
filing date -
Apr 9, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A system for processing a continuous web of envelope stock includes a web aligner, infeed nip including a load cell, rotary cutter, gummer, patch applicator, buffer, and control system. Gummer nozzles are actuated to apply patterns of adhesive to the moving web in surrounding relation to window apertures. A method for controlling the web output rate from the system includes receiving at the control system an input web tension indicator from the nip load cell, receiving an output web tension indicator from a transducer at system output, comparing the received indicators and transmitting a control signal to actuate a roller assembly between the infeed nip and the transducer to increase or decrease speed to adjust web tension. The control system also transmits a web input speed control or stop signal based on the calculated capacity percentage of web accumulated in the buffer, which is determined with reference to a threshold value.
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