Method and apparatus for checking letter thickness

Details Method and apparatus for checking letter thickness Method and apparatus for checking letter thickness

1981-01-05

1982-11-23

Knowles, Allen N.

Classifying, separating, and assorting solids

Sorting special items, and certain methods and apparatus for...

Condition responsive means controls separating means

209603, 209618, 209900, 29113R, 73 377, 73 52, B07C 534

Patent

active

043601081

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.

REFERENCES:
patent: 2712870 (1955-07-01), Geertsen
patent: 3319784 (1967-05-01), Granger
patent: 3589714 (1971-06-01), Staples
patent: 4031741 (1977-06-01), Schaming
patent: 4075739 (1978-02-01), Staheli
patent: 4117718 (1978-10-01), Hayward

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