Overlapped-transfer detecting apparatus for mail article

Details Overlapped-transfer detecting apparatus for mail article Overlapped-transfer detecting apparatus for mail article

1987-01-07

1988-03-22

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

209900, 271263, G08B 2100

Patent

active

047332263

ABSTRACT:
A detector for use in a mail sorter is positioned along a path over which articles (letters, postcards, etc.) travel while in an upright position. A problem with such paths is that sometimes articles are overlapped, and sometimes small articles are hidden behind large articles. The invention detects such overlaps by (1) detecting height changes of any single article which trips a detector only once, and (2) forcibly displacing one article relative to the other of two overlapped articles. The change of length resulting from the forced displacement is detected.

REFERENCES:
patent: 3918586 (1975-11-01), Tyler et al.
patent: 3955812 (1976-05-01), Suda et al.
patent: 4121716 (1978-10-01), Luperti et al.
patent: 4136780 (1979-01-01), Hunter et al.
patent: 4504961 (1985-03-01), Horiguchi

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