Method and apparatus for performing the setting-up of the fault-

Details Method and apparatus for performing the setting-up of the fault- Method and apparatus for performing the setting-up of the fault-

1977-04-27

1979-02-20

Dahl, Lawrence J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356240, G01D 2104, G01N 2122

Patent

active

041409019

ABSTRACT:
The apparatus includes a photoelectric sensor associated with a predetermined zone of a hollow glass article to be examined for faults. During one testing operation, the photoelectric sensor successively detects all faults in that zone and generates for each a fault signal whose value is dependent upon the characteristics of the fault. The fault signals are applied to a threshold circuit which generates an output signal only when the fault-signal value exceeds a threshold-signal level. The setting-up procedure involves performing at least one preliminary testing operation upon a preselected sample or standard article having acceptable faults. Each threshold-circuit output signal automatically results in a circuit adjustment which reduces by a predetermined amount the extent to which the respective fault-signal value exceeds the threshold-signal level. The preliminary testing operation is performed repeatedly, until the largest-value fault signal generated during one testing operation has a value slightly below the threshold-signal level, whereupon the testing apparatus has been properly set-up automatically. Thereafter, testing operations are performed upon articles whose eventual faults or flaws are not yet known to be acceptable.

REFERENCES:
patent: 3479514 (1969-11-01), Kidwell
patent: 3687559 (1972-08-01), Fischer
patent: 3942001 (1976-03-01), O'Connor

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