Method and apparatus for checking letter thickness
AssigneeJoule' Technical Corporation
InventorEmanuel N. Logothetis
Life of this patent
Estimating the term…
Abstract
A method and apparatus are described for automatically checking envelopes for objects which would interere with an automatic postal mail sorting operation. The envelopes are moved between inflated rollers and changes in the roller pressures caused by objectionable objects in the envelopes are detected to control an envelope diversion gate.
Claims13
Envelope inspection means comprising the comination of inflated roller means, means for passing the envelopes past the roller means whereby the roller pressure varies with the envelope shape, and means for generating a control signal in accordance with the roller pressure change.
A method of inspecting moving envelopes comprising the steps of passing the envelopes through an inflated envelope contacting means for varying the pressure of the contacting means in accordance with the envelope shape, detecting the change in the pressure of the contacting means caused by the passing envelopes, and generating a control signal responsive to the detected pressure changes.
Dependencies are inferred from the claim text.